400kv protection presentation

400KV PROTECTION400KV PROTECTION400KV PROTECTION400KV PROTECTIONPREPARED BYPREPARED BY

GOPALA KRISHNA PALEPUGOPALA KRISHNA PALEPUADE/APTRANSCOADE/APTRANSCO

[email protected], [email protected], Mobile:9440336984Mobile:9440336984

BASICS BASICS OF OF OF OF

ONE AND HALF ONE AND HALF CIRCUIT BREAKER CIRCUIT BREAKER CIRCUIT BREAKER CIRCUIT BREAKER

SCHEMESCHEMEPREPARED BY

GOPALA KRISHNA PALEPUADE/MRT(PROTECTION)

ONE & HALF BREAKER DESCRIPTIONONE & HALF BREAKER DESCRIPTIONBUS-1

BUS-1 BUS-2

1. IN THIS TWO BUSES ARE PRIOVIDED.

BUS-1 BUS-2

BUS-2


BUS-1 BUS-2

2. THESE TWO BUSES ARE INTER-CONNECTED BY THREE CIRCUIT BREAKERS.

BUS-1 BUS-2

BUS-2


BUS-1 BUS-2

1-52 CB

3. THEY ARE DESIGNATED AS 1-52 CB, 2-52 CB, 3-52 CB.

BUS-1 BUS-2

2-52 CB

1-52 CB 3-52 CB

BUS-2

3-52 CB

2-52 CB


BUS-1 BUS-2

1-52 CB

4. LINE - 1 IS CONNECTED IN BETWEEN 1-52 CB & 2-52 CB.

5. LINE - 2 IS CONNECTED IN BETWEEN 3-52 CB & 2-52 CB.

BUS-1 BUS-2

2-52 CB

1-52 CB 3-52 CB

LINE-1

BUS-2

3-52 CB

2-52 CB

LINE-2

LINE-1 LINE-2


BUS-1 BUS-2

1-52 CB

6. LINE-1 HAVING TWO FEEDING PATHS i.eA. VIA BUS-1 & 1-52 CBB. VIA BUS-2, 3-52 CB & 2-52 CB

7. LINE-2 HAVING TWO FEEDING PATHS i.eA. VIA BUS-2 & 3-52 CBB. VIA BUS-1, 1-52 CB & 2-52 CB

BUS-1 BUS-2

2-52 CB

1-52 CB 3-52 CB

LINE-1

BUS-2

3-52 CB

2-52 CBLINE-2

LINE-1 LINE-2


BUS-1 BUS-2

1-52 CB

8. FOR INTURUPTING LINE-1 THE 1-52CB AND 2-52CB IS TO BE TRIPPED.

9. FOR INTURUPTING LINE-2 THE 3-52CB AND 2-52CB IS TO BE TRIPPED.

BUS-1 BUS-2

2-52 CB

1-52 CB 3-52 CB

LINE-1

BUS-2

3-52 CB

2-52 CB

LINE-2

LINE-1 LINE-2


BUS-1 BUS-2

1-52 CB

10. FOR ANY PROBLEM IN LINE-1 OR LINE-2 ALONG WITH MAIN BREAKER THE MIDDLE BREAKER OR SAY TIE BREAKER (2-52 CB) MUST TRIP.

BUS-1 BUS-2

2-52 CB

1-52 CB 3-52 CB

LINE-1

BUS-2

3-52 CB

2-52 CB

LINE-2

LINE-1 LINE-2


BUS-1 BUS-2

1-52 CB13. SO THESE TWO FEEDERS CONTROLLED BY THREE CIRCUIT BREAKERS

IT IS CALLED ONE & HALF BREAKER SYSTEM.

11. NORMALLY IN ALL TYPES OF BUSBAR CONFIGUARATIONS ONE BREAKER IS SUFFICIENT FOR ONE FEEDER.

12. HERE TWO FEEDERS ARE CONTROLED BY THREE BREAKERS.

BUS-1 BUS-2

2-52 CB

1-52 CB 3-52 CB

LINE-1

BUS-2

3-52 CB

2-52 CB

LINE-2

LINE-1 LINE-2


BUS-1 BUS-2

1-52 CB

14. THE BAY BETWEEN BUS-1 & LINE-1 IS CALLED MAIN BAY FOR FEEDER-1.

MA

IN B

AY

(1S

TB

AY

) F

OR

FE

ED

ER

-1

BUS-1 BUS-2

2-52 CB

1-52 CB 3-52 CB

LINE-1

MA

IN B

AY

(1

BA

Y)

FO

R F

EE

DE

R-1

BUS-2

3-52 CB

2-52 CB

LINE-2

LINE-1 LINE-2

MA

IN B

AY

(1S

TB

AY

) F

OR

FE

ED

ER


BUS-1 BUS-2

1-52 CB

MA

IN B

AY

(1S

TB

AY

) F

OR

FE

ED

ER

-1 15. THE BAY BETWEEN LINE-1 & LINE-2 IS CALLED TIE BAY FOR FEEDER-1 & 2.

BUS-1 BUS-2

2-52 CB

1-52 CB 3-52 CB

LINE-1

MA

IN B

AY

(1

BA

Y)

FO

R F

EE

DE

R-1

TIE

BA

Y (

2N

DB

AY

) F

OR

FE

ED

ER

-1 &

2

BUS-2

3-52 CB

2-52 CB

LINE-2

LINE-1 LINE-2

MA

IN B

AY

(1S

TB

AY

) F

OR

FE

ED

ER

TIE

BA

Y (

2

TIE BAY (2ND BAY ) FOR FEEDER-1 & 2.


BUS-1 BUS-2

1-52 CB

MA

IN B

AY

(1S

TB

AY

) F

OR

FE

ED

ER

-1 16. THE BAY BETWEEN BUS-2 & LINE-2 IS CALLED MAIN BAY FOR FEEDER-2.

BUS-1 BUS-2

2-52 CB

1-52 CB 3-52 CB

LINE-1

MA

IN B

AY

(1

BA

Y)

FO

R F

EE

DE

R-1

TIE

BA

Y (

2N

DB

AY

) F

OR

FE

ED

ER

-1 &

2

BA

Y)

FO

R F

EE

DE

R-2

BUS-2

3-52 CB

2-52 CB

LINE-2

LINE-1 LINE-2

MA

IN B

AY

(1S

TB

AY

) F

OR

FE

ED

ER

TIE

BA

Y (

2


MA

IN B

AY

(3R

DB

AY

) F

OR

FE

ED

ER

-2

MA

IN B

AY

(3R

D


BUS-1 BUS-2

1-52 CB

MA

IN B

AY

(1S

TB

AY

) F

OR

FE

ED

ER

-1

17. IN THIS SYSTEM FULL DIA MEANS 2 FEEDERS CONTROLLED BY 3 CBs.18. HALF DIA MEANS 1 FEEDER CONTROLLED BY 2 CBs.

(Nothing but Double CB System)

BUS-1 BUS-2

2-52 CB

1-52 CB 3-52 CB

LINE-1

MA

IN B

AY

(1

BA

Y)

FO

R F

EE

DE

R-1

TIE

BA

Y (

2N

DB

AY

) F

OR

FE

ED

ER

-1 &

2

BA

Y)

FO

R F

EE

DE

R-2

BUS-2

3-52 CB

2-52 CB

LINE-2

LINE-1 LINE-2

MA

IN B

AY

(1S

TB

AY

) F

OR

FE

ED

ER

TIE

BA

Y (

2


MA

IN B

AY

(3R

DB

AY

) F

OR

FE

ED

ER

-2

MA

IN B

AY

(3R

D


BUS-1 BUS-2

1-52 CB

MA

IN B

AY

(1S

TB

AY

) F

OR

FE

ED

ER

-1

GOPALA KRISHNA PALEPU ADE/MRT/ T&C/400KV SS/

O/O CE/400KV / L&SS/ VSAPTRANSCO, [email protected]

Mobile: 9440336984

BUS-1 BUS-2

2-52 CB

1-52 CB 3-52 CB

LINE-1

MA

IN B

AY

(1

BA

Y)

FO

R F

EE

DE

R-1

TIE

BA

Y (

2N

DB

AY

) F

OR

FE

ED

ER

-1 &

2

BA

Y)

FO

R F

EE

DE

R-2

BUS-2

3-52 CB

2-52 CB

LINE-2

LINE-1 LINE-2

MA

IN B

AY

(1S

TB

AY

) F

OR

FE

ED

ER

TIE

BA

Y (

2


MA

IN B

AY

(3R

DB

AY

) F

OR

FE

ED

ER

-2

MA

IN B

AY

(3R

D

SUBSTATION DESIGN/LAYOUT SUBSTATION DESIGN/LAYOUT (I(I--CONFIGUARATION)CONFIGUARATION)

FEEDER1 FEEDER3 FEEDER5 FEEDER7 FEEDER9 FEEDER11

BUSBUS--11 DIA1 DIA2 DIA3 DIA4 DIA5 DIA6

BA

Y1

BA

Y2

BA

Y4

BA

Y5

BA

Y7

BA

Y8

BA

Y10

BA

Y11

BA

Y13

BA

Y14

BA

Y16

BA

Y17


BUSBUS--22

BA

Y3

BA

Y6

BA

Y9

BA

Y12

BA

Y15

BA

Y18

SUBSTATION DESIGN/LAYOUTSUBSTATION DESIGN/LAYOUT(D(D--CONFIGUARATION)CONFIGUARATION)


BAY2 BAY8 BAY14

BUSBUS--22

BUSBUS--11

BA

Y1

BA

Y3

BA

Y4

BA

Y6

BA

Y7

BA

Y9

BA

Y10

BA

Y12

BA

Y13

BA

Y15

BA

Y16

BA

Y18

DIA1 DIA3 DIA5

DIA6


BA

Y4

BAY5

BA

Y6

BA

Y10

BAY11

BA

Y12

BA

Y16

BAY17

BA

Y18

DIA2 DIA4 DIA6

CT METHODS CT METHODS IN IN IN IN




DIFFERENT CT METHODS OF ONE & HALF BREAKER SYSTEMDIFFERENT CT METHODS OF ONE & HALF BREAKER SYSTEM

3 CT METHOD3 CT METHOD


LINE

LINE

CB CB CB

CB CB CB

AT/F

AT/FCB CB CB



LINE

LINECB CB CB

CB CB CB

AT/F

AT/F

5 CT METHOD5 CT METHODLINE

CB CB CB

AT/F


LINE

AT/F


LINECB CB CB

AT/F

LINE8 CT METHOD8 CT METHOD

AT/F

CB CB CB

SINGLE BUS SYSTEMSINGLE BUS SYSTEM

11--52CB52CB1-89 1-89L

1-CT

P2 P1

BUS

1-CVTBB-EVT / CVT

BU

SB

AR

MA

IN1

PR

OT

BU

SB

AR

MA

IN1

PR

OT

BU

SB

AR

MA

IN2

PR

OT

BU

SB

AR

MA

IN2

PR

OT

BC

U +

EN

ER

GY

ME

TE

RB

CU

+ E

NE

RG

Y M

ET

ER

1 P

RO

TE

CT

ION

1 P

RO

TE

CT

ION

FO

R L

INE

(2

1L

1/8

7L

1)

FO

R L

INE

(2

1L

1/8

7L

1)

PR

OT

EC

TIO

NP

RO

TE

CT

ION

FO

R L

INE

(2

1L

2/8

7L

2)

FO

R L

INE

(2

1L

2/8

7L

2)

12345

1

BU

SB

AR

MA

IN1

PR

OT

BU

SB

AR

MA

IN1

PR

OT

(87

BB

M1

+ L

BB

)(8

7B

BM

1+

LB

B)

BU

SB

AR

MA

IN2

PR

OT

BU

SB

AR

MA

IN2

PR

OT

(87

BB

M2

+ L

BB

)(8

7B

BM

2+

LB

B)

BC

U +

EN

ER

GY

ME

TE

RB

CU

+ E

NE

RG

Y M

ET

ER

FO

R L

INE

FO

R L

INE

MA

INM

AIN

--1 P

RO

TE

CT

ION

1 P

RO

TE

CT

ION

FO

R L

INE

(2

1L

1/8

7L

1)

FO

R L

INE

(2

1L

1/8

7L

1)

MA

INM

AIN

--22P

RO

TE

CT

ION

PR

OT

EC

TIO

NF

OR

LIN

E (

21

L2

/87

L2

)F

OR

LIN

E (

21

L2

/87

L2

)

1 2 3

1

2

3

LATEST CONCEPT

REDUNDANT LINE PROTECTION, REDUNDANT ICT PROTECTION, REDUNDANT BUSBAR

PROTECTION, LBB IS IN BUILT FUNCTION OF BUSBAR

400KV C.T. INFORMATION400KV C.T. INFORMATIONP1 P2

P1 P2

PRIMARY CONNECTIONS : P1 – P2

CURRENT RATING : 2000 AMPS

CORES CLASS PURPOSE

SECONDARY CONNECTIONS

CURRENT RATING : 1A

HAIRHAIR

CORES CLASS PURPOSE CURRENT RATING : 1A

2000/ 1A 1000/ 1A 500/ 1A

CORE-1 PSBUSBAR

PROTECTION1S1 – 1S3

1S1 – 1S2

1S2 – 1S3

__

CORE-2 PS

BUSBAR

CHECKUP

PROTECTION

2S1 – 2S32S1 – 2S2

2S2 – 2S3__

1

2

3

4

5

1 5

EYE BOLT EYE BOLT DESIGNDESIGN

HAIRHAIRPIN / PIN /

U SHAPE U SHAPE DESIGNDESIGN

DEAD TANK DESIGNDEAD TANK DESIGN

CORE-3 0.2 METERING 3S1 – 3S43S1 – 3S3

3S4 – 3S2

3S1 – 3S2

3S4 – 3S3

CORE-4 PSMAIN-2


4S1 – 4S3

4S4 – 4S2

4S1 – 4S2

4S4 – 4S3

CORE-5 PSMAIN-1


5S1 – 5S3

5S4 – 5S2

5S1 – 5S2

5S4 – 5S3

1

2

3

4

5

ONE & HALF BREAKER SYSTEMONE & HALF BREAKER SYSTEM

1-89 3-89

BUS-1 BUS-2

(3CT METHOD)(3CT METHOD)

1-89A

11--52CB52CB

3-89A

33--52CB52CB

1-CT

P1

P2

3-CTP1

P2

2-CT

P1 P2

LINE 1

22--52CB52CB2-89A 2-89B

1-89L 3-89T

T/F-1

CT CONNECTIONS IN 3CT METHODCT CONNECTIONS IN 3CT METHOD

CORECORE 1 1 –– CTCT 2 2 –– CTCT 3 3 –– CTCT

CORE CORE –– 11( PS)( PS)

MAIN1 BUSBARMAIN1 BUSBAR--1 1

PROTECTION LBB IN BUILTPROTECTION LBB IN BUILT

(87BB1M1)(87BB1M1)

MAIN1 DIFFFERENTIAL MAIN1 DIFFFERENTIAL

PROTECTION FOR PROTECTION FOR

TRANSFORMER (87T1)TRANSFORMER (87T1)



(87BB2M1)(87BB2M1)(87BB1M1)(87BB1M1) TRANSFORMER (87T1)TRANSFORMER (87T1) (87BB2M1)(87BB2M1)

CORE CORE –– 2 2 ( PS)( PS)


PROTECTION LBB INBUILT PROTECTION LBB INBUILT

(87BB1M2)(87BB1M2)

BACKUP PROTECTION FOR BACKUP PROTECTION FOR

TRANSFORMER (67 HV)TRANSFORMER (67 HV)


PROTECTION LBB IN BUILT PROTECTION LBB IN BUILT

(87BB2M2)(87BB2M2)

CORE CORE –– 3 3 ( 0.2)( 0.2)

SPARESPAREHV BCU + HV ENERGY HV BCU + HV ENERGY

METER FOR AT/F HVMETER FOR AT/F HVSPARESPARE

CORE CORE –– 4 4 BCU + ENERGY METER BCU + ENERGY METER BCU + ENERGY METER BCU + ENERGY METER HV BCU + HV ENERGY HV BCU + HV ENERGY CORE CORE –– 4 4 (0.2)(0.2) FOR FEEDERFOR FEEDER FOR FEEDERFOR FEEDER METER FOR AT/F HVMETER FOR AT/F HV


MAINMAIN--2 LINE PROTECTION 2 LINE PROTECTION

FOR FEEDER (21 L2 / 87L2)FOR FEEDER (21 L2 / 87L2)

MAINMAIN--2 LINE PROTECTION 2 LINE PROTECTION

FOR FEEDER (21 L2 / 87L2)FOR FEEDER (21 L2 / 87L2)




MAINMAIN--1 LINE PROTECTION1 LINE PROTECTION

FOR FEEDER (21L1/87L1)FOR FEEDER (21L1/87L1)







CORECORE 1 1 –– CTCT 2 2 –– CTCT 3 3 –– CTCT

CORE CORE –– 11( PS)( PS)



(87BB1M1)(87BB1M1)






(87BB2M1)(87BB2M1)(87BB1M1)(87BB1M1) TRANSFORMER (87T1)TRANSFORMER (87T1) (87BB2M1)(87BB2M1)



PROTECTION LBB INBUILT PROTECTION LBB INBUILT

(87BB1M2)(87BB1M2)




PROTECTION LBB IN BUILT PROTECTION LBB IN BUILT

(87BB2M2)(87BB2M2)

CORE CORE –– 3 3 (0.2)(0.2)

BCU + ENERGY METER BCU + ENERGY METER

FOR FEEDERFOR FEEDER

BCU + ENERGY METER BCU + ENERGY METER

FOR FEEDERFOR FEEDERSPARESPARE

CORE CORE –– 4 4 MAINMAIN--2 LINE PROTECTION 2 LINE PROTECTION MAINMAIN--2 LINE PROTECTION 2 LINE PROTECTION BACKUP PROTECTION FOR BACKUP PROTECTION FOR CORE CORE –– 4 4 ( PS)( PS) FOR FEEDER (21 L2 / 87L2)FOR FEEDER (21 L2 / 87L2) FOR FEEDER (21 L2 / 87L2)FOR FEEDER (21 L2 / 87L2) TRANSFORMER (67 HV)TRANSFORMER (67 HV)









BUSHING CT BUSHING CT

METERING CORE METERING CORE (0.2)(0.2)

NORMALLY THIS SYTEM ADOPTS, WHEN ONE SIDE LINE, OTHER SIDE AUTO NORMALLY THIS SYTEM ADOPTS, WHEN ONE SIDE LINE, OTHER SIDE AUTO

TRANSFORMER OR BUS REACTOR IS PROVIDED IN A DIA OF ONE AND HALF BREAKER TRANSFORMER OR BUS REACTOR IS PROVIDED IN A DIA OF ONE AND HALF BREAKER

SYSTEM, IF BUSHING CT METERING CORE IS AVAILABLE, THEN IT IS USED FOR HV BCU SYSTEM, IF BUSHING CT METERING CORE IS AVAILABLE, THEN IT IS USED FOR HV BCU

+ HV ENERGY METER FOR AT/F HV OR BUS REACTOR+ HV ENERGY METER FOR AT/F HV OR BUS REACTOR


BUS-1 BUS-2


79+25(BCU)

79+25(BCU)

VBB1

VL1/VL2OR VBB2

VBB2

VL2/VL1OR VBB1

87BB1M1BU

87BB1M2BU

BCU+EM (L)

MAIN1:21L1 / 87L1

MAIN2: 21L2/87L2

87BB2M1BU

87BB2M2BU

SPARE

MAIN1:87T1

B/U: 67HV

BC

U+

EM

(H

V)

MA

IN1:8

7T

1

B/U

: 67LV

79+25(BCU)

OR VBB2 OR VBB1

VBB1/VL1

VBB2/VL2

LINE 1

ICT

BC

U+

EM

(L)

MA

IN1:2

1L

1 / 8

7L

1

MA

IN2: 2

1L

2/8

7L

2

MA

IN1:8

7T

1

B/U

: 67H

V

BC

U+

EM

(H

V)

MA

IN2:8

7T

2

MA

IN1:8

7T

1

B/U

: 67LVVBB2/VL2

LB

B

ONE & HALF BREAKER SYSTEMONE & HALF BREAKER SYSTEM(3CT METHOD) (3CT METHOD) –– LINE PROTECTIONLINE PROTECTION

BU

S-1

BCU+EMBCU+EM

MAIN2: 21L2MAIN2: 21L2

FIBER

MAIN1: 87BB1MAIN1: 87BB1

MAIN2 :87BB1MAIN2 :87BB1


LINE FIBEROPTIC

OPTIC

C

E

50Z +87BBCENTRAL UNITLBB IS INBUILT

BUSBAR

ABB Network Partner AG

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

ABB Network Partner AG REL 316*4

C

E

ONE & HALF BREAKER SYSTEMONE & HALF BREAKER SYSTEM(3CT METHOD) (3CT METHOD) –– ICT PROTECTIONICT PROTECTION

BU

S-2

TIE LBBTIE LBB



BCU+EMBCU+EM

MAIN2: 87T2MAIN2: 87T2

B/U: 67HVB/U: 67HV

50Z +87BB


1

2

9

10


ICT


C

E


BUSBAR

3

4

5

6

7

8

11

12

13

14

15

16

C

E

B/U: 67LVB/U: 67LV

ONE & HALF BREAKER ( 3 CT METHOD) WITH PROTECTION SCHEMEONE & HALF BREAKER ( 3 CT METHOD) WITH PROTECTION SCHEME

87BB1

CVT

VBB1

79

25

BF

VL1 / VL2

OR VBB2

VBB1

87L 21M2 CVT VL1VL1

BUSBARBUSBAR--11

21M1 VL1

79

25

FEEDER1 / LINE1

FEEDER2 / LINE2

BF

VL1 / VBB1

VL2 / VBB2

87BB2

CVT

VBB279

25VBB2

BF

VL2 / VL1

OR VBB1

FEEDER2 / LINE2

CVT VL2

BUSBARBUSBAR--22

MAIN-1

MAIN-2PROTECTION OF LINE2

(OR TRANSFORMER, IF APPLICABLE)

FOR TRANSFORMER PROTECTION & METERING VOLTAGE SELECTION RELAYS FOR BUS-1, BUS-2& LINE ARE PROVIDED .

BU

S-I

BU

S-I

I

MA

IN-1

MA

IN-2

ME

T+

SY

N

MA

IN-1

MA

IN-2

ME

T+

SY

N87 B

B M

1 B

US

BA

R P

RO

TN

MA

IN-1

87 B

B M

1 B

US

BA

R P

RO

TN

MA

IN-1

87 B

B M

2 B

US

BA

R P

RO

TN

MA

IN-2

87 B

B M

2 B

US

BA

R P

RO

TN

MA

IN-2

21L1

-LI

NE

DIS

T P

RO

T1

21L2

-LI

NE

DIS

T P

RO

T2

87T

1-IC

T D

IFF

PR

OT

1

67H

V-

ICT

DIR

O/C

,E/F


BU

S

BU

S

1-52

CB

2-52

CB

3-52

CB

MAIN-1MAIN-2

MET+SYN

ME

T+

SY

N

ME

T+

SY

N

DISTURBANCE RECORDER,

EVENT RECORDER, FAULT LOCATOR

ARE IN BUILT FUNCTIONS IN BOTH


EVENT RECORDER,


NUMERICAL DIFF PROT RELAYS

87T2- ICT DIFF PROT2


NUMERICAL DIST PROT RELAYS

21L1 & 21L2


87T1 & 87T2

FOR ICT CVT IS NOT AVAILABLE.

ACCORDING TO CONDITION IT IS SELECTED

BUS-1 CVT OR BUS-2 CVT OR LINE CVT

HV & LV OVER FLUX PROT ARE IN BUILT.

ICT HV METERING IS BUSHING CT

LATEST CONCEPT

REDUNDANT LINE PROTECTION

REDUNDANT ICT PROTECTION

REDUNDANT DISTRIBUTED BUSBAR PROTECTION

LBB IS IN BUILT FUNCTION OF BUSBAR


1-89 3-89

BUS-1 BUS-2


1-89A

11--52CB52CB

3-89A

33--52CB52CB

1-CTP1

P2

3-CTP1

P2

2-ACTP1P2

2-BCT

P1 P2

LINE 1

22--52CB52CB2-89A 2-89B

1-89L 3-89T

T/F-1

CORECORE 11-- CTCT 22--BCTBCT 22--ACTACT 33--CTCT

CORECORE--1 1 (PS)(PS)


PROTECTION PROTECTION

LBB IN BUILTLBB IN BUILT

(87BB1M1)(87BB1M1)

SPARESPARE SPARESPARE




(87BB2M1)(87BB2M1)


(87BB1M1)(87BB1M1) (87BB2M1)(87BB2M1)




LBB INBUILT LBB INBUILT

(87BB1M2)(87BB1M2)

TIE LBBTIE LBB SPARESPARE




(87BB2M2)(87BB2M2)

CORECORE--3 3 (0.2)(0.2)

BCU + ENERGY BCU + ENERGY

METER METER


BCU + ENERGY BCU + ENERGY

METER METER


HV BCU + HV HV BCU + HV

ENERGY METER ENERGY METER

FOR ICT HVFOR ICT HV

HV BCU + HV HV BCU + HV

ENERGY METER ENERGY METER

FOR ICT HVFOR ICT HV

MAINMAIN--2 LINE 2 LINE MAINMAIN--2 LINE 2 LINE BACKUP BACKUP BACKUP BACKUP


MAINMAIN--2 LINE 2 LINE


FEEDERFEEDER

(21 L2 / 87L2)(21 L2 / 87L2)



FEEDER FEEDER

(21 L2 / 87L2)(21 L2 / 87L2)

BACKUP BACKUP


TRANSFORMER TRANSFORMER

(67 HV)(67 HV)

BACKUP BACKUP


TRANSFORMERTRANSFORMER

(67 HV)(67 HV)



PROTECTIONPROTECTION FOR FOR

FEEDER FEEDER

(21L1/87L1)(21L1/87L1)


PROTECTIONPROTECTION FOR FOR

FEEDER FEEDER

(21L1/87L1)(21L1/87L1)

MAIN1MAIN1--ICT ICT

DIFFFERENTIAL DIFFFERENTIAL



(87T1)(87T1)

MAIN1 MAIN1 ––ICT ICT




(87T1)(87T1)


BUS-1 BUS-2

(4 CT METHOD)(4 CT METHOD)

79+25(BCU)

79+25(BCU)

VBB1

VL1/VL2OR VBB2

VBB2

VL2/VL1OR VBB1

87BB1M1BU

87BB1M2BU

BCU+EM (L)

MAIN1:21L1 / 87L1

MAIN2: 21L2/87L2

87BB2M1BU

87BB2M2BU

MAIN1:87T1

B/U: 67HV

BCU+EM (HV)

MA

IN1:8

7T

1

B/U

: 67LV

79+25(BCU)

OR VBB2 OR VBB1

VBB1/VL1

VBB2/VL2

LINE 1

ICT

BC

U+

EM

(HV

)

MA

IN1:2

1L

1 / 8

7L

1

MA

IN2: 2

1L

2/8

7L

2

MA

IN1:8

7T

1

B/U

: 67H

V

MA

IN2:8

7T

2

MA

IN1:8

7T

1

B/U

: 67LV

TIE

LB

B

BC

U+

EM

(L)


BU

S-1

BCU+EM(L)BCU+EM(L)


FIBER




TIE LBB

LINE FIBEROPTIC

OPTIC

C

E


BUSBAR


1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16


C

E


BU

S-2



BCU+EM (HV)BCU+EM (HV)


B/U: 67HVB/U: 67HV

50Z +87BB


1

2

9

10


ICT


C

E


BUSBAR

3

4

5

6

7

8

11

12

13

14

15

16

C

E

B/U: 67LVB/U: 67LV


87BB1

CVT

VBB1

79

25

BF

VL1 / VL2

OR VBB2

VBB1

87L 21M2 CVT VL1VL1

BUSBARBUSBAR--11

21M1 VL1

FEEDER1 / LINE1

FEEDER2 / LINE2

BF

79

25VL1 / VBB1

VL2 / VBB2

87BB2

CVT

VBB279

25VBB2

BF

VL2 / VL1

OR VBB1

FEEDER2 / LINE2

CVT VL2

BUSBARBUSBAR--22

MAIN-1

MAIN-2PROTECTION OF LINE2

(OR TRANSFORMER, IF APPLICABLE)


BU

S-I

BU

S-I

I

MA

IN-1

MA

IN-2

ME

T+

SY

N

MA

IN-1

MA

IN-2

ME

T+

SY

N87 B

B M

1 B

US

BA

R P

RO

TN

MA

IN-1

87 B

B M

1 B

US

BA

R P

RO

TN

MA

IN-1

87 B

B M

2 B

US

BA

R P

RO

TN

MA

IN-2

87 B

B M

2 B

US

BA

R P

RO

TN

MA

IN-2

21L1

-LI

NE

DIS

T P

RO

T1

21L2

-LI

NE

DIS

T P

RO

T2

87T

1-IC

T D

IFF

PR

OT

1

67H

V-

ICT

DIR

O/C

,E/F


BU

S

BU

S

1-52

CB

2-52

CB

3-52

CB

MAIN-1MAIN-2

MET+SYN

ME

T+

SY

N

ME

T+

SY

N


EVENT RECORDER, FAULT LOCATOR




EVENT RECORDER,



87T2- ICT DIFF PROT2


21L1 & 21L2


87T1 & 87T2

FOR ICT CVT IS NOT AVAILABLE.

ACCORDING TO CONDITION IT IS SELECTED

BUS-1 CVT OR BUS-2 CVT OR LINE CVT

HV & LV OVER FLUX PROT ARE IN BUILT

LATEST CONCEPT

REDUNDANT LINE PROTECTION

REDUNDANT ICT PROTECTION

REDUNDANT DISTRIBUTED BUSBAR PROTECTION

LBB IS IN BUILT FUNCTION OF BUSBAR


3-89

BUS-1 BUS-2

1-89P1P1

1A-CT 3A-CT


1-89A

11--52CB52CB

1B-CT

3-89A

33--52CB52CB

3B-CT

2B-CT

P2

P1

P2

P1

P2 P1P1 P2

P2

P1

P21A-CT

2A-CT

3A-CT

LINE 1

22--52CB52CB2-89A 2-89B

1-89L 3-89T

T/F-1

CURRENT TRANSFORMERCURRENT TRANSFORMER

CONNECTIONS IN 6CT METHODCONNECTIONS IN 6CT METHOD(GIS or AIS with DEAD TANK CBs) (GIS or AIS with DEAD TANK CBs)

1B1B--CTCT 1A1A--CTCT 2B2B--CTCT 2A2A--CTCT 3A3A--CTCT 3B3B--CTCT

CORECORE--1 1 MAIN1 MAIN1 2CT’s SECONDARIES 2CT’s SECONDARIES 2CT’s SECONDARIES 2CT’s SECONDARIES MAIN1 MAIN1 CORECORE--1 1

(PS)(PS)

MAIN1 MAIN1 BUSBARBUSBAR--1 1

PROTN PROTN LBB IN BUILT LBB IN BUILT

(87BB1M1)(87BB1M1)

2CT’s SECONDARIES 2CT’s SECONDARIES ARE CONNECTED ARE CONNECTED IN PARALLEL AND IN PARALLEL AND CONNECTED TO CONNECTED TO

MAINMAIN--1 PROTECTION1 PROTECTION

2CT’s SECONDARIES 2CT’s SECONDARIES ARE CONNECTED ARE CONNECTED CONNECTED TO CONNECTED TO

MAINMAIN--1 PROTECTION1 PROTECTION

MAIN1 MAIN1 BUSBARBUSBAR--22

PROTN LBB IN PROTN LBB IN BUILTBUILT

(87BB2M1)(87BB2M1)

CORECORE--2 2

(PS)(PS)


PROTN PROTN LBB INBUILT LBB INBUILT (87BB1M2)(87BB1M2)

2CT’s SECONDARIES 2CT’s SECONDARIES ARE CONNECTED INARE CONNECTED IN

PARALLEL AND PARALLEL AND CONNECTED TOCONNECTED TO

MAINMAIN--2 PROTECTION 2 PROTECTION


PARALLEL AND PARALLEL AND CONNECTED TO CONNECTED TO

BACKUP PROTECTION BACKUP PROTECTION


PROTN LBB PROTN LBB INBUILT INBUILT

(87BB2M2)(87BB2M2)

CORECORE--3 3

(0.2)(0.2)

SPARESPARE 2CT’s SECONDARIES 2CT’s SECONDARIES ARE CONNECTED INARE CONNECTED IN


BCU + ENERGY BCU + ENERGY METER FOR METER FOR

FEEDERFEEDER



HV BCU + HV HV BCU + HV ENERGY METER FOR ENERGY METER FOR

ICT HVICT HV

SPARESPARE


BUS-1 BUS-2


MAIN1:21L1 / 87L1

MAIN2: 21L2/87L2

MAIN1:87T1

B/U: 67HV

87BB1M1BU

87BB1M2BU

BCU+EM (L)

MAIN2: 21L2/87L2

87BB2M1BU

87BB2M2BU

B/U: 67HV

BCU+EM (HV)

MA

IN1:8

7T

1

B/U

: 67LV

79+25(BCU)

79+25(BCU)

79+25(BCU)

VBB1

VL1/VL2OR VBB2

VBB2

VL2/VL1OR VBB1

VB

B1/V

L1

VB

B2/V

L2

LINE 1

ICT

BC

U+

EM

(HV

)

MA

IN1:2

1L

1 / 8

7L

1

MA

IN2: 2

1L

2/8

7L

2

MA

IN1:8

7T

1

B/U

: 67H

V

MA

IN2:8

7T

2

MA

IN1:8

7T

1

B/U

: 67LV

TIE

LB

B

BC

U+

EM

(L)


BU

S-1

BCU+EM(L)BCU+EM(L)


FIBER




TIE LBB

LINE FIBEROPTIC

OPTIC

C

E


BUSBAR


1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16


C

E


BU

S-2



BCU+EM (HV)BCU+EM (HV)


B/U: 67HVB/U: 67HV

50Z +87BB


1

2

9

10


ICT


C

E


BUSBAR

3

4

5

6

7

8

11

12

13

14

15

16

C

E

B/U: 67LVB/U: 67LV


87BB1

CVT

VBB1

BF

79

25

VL1 / VL2

VBB187L 21M2 CVT VL1

VL1

BUSBARBUSBAR--11

21M1 VL1

VL1 / VL2

OR VBB2 FEEDER1 / LINE1

FEEDER2 / LINE2

BF

79

25VL1 / VBB1

VL2 / VBB2

87BB2

CVT

VBB279

25VBB2

VL2 / VL1

OR VBB1

FEEDER2 / LINE2

CVT VL2

BUSBARBUSBAR--22

MAIN-1

MAIN-2

PROTECTION OF LINE2(OR TRANSFORMER, IF APPLICABLE)


BF

TYPICAL ONE & HALF BREAKER TYPICAL ONE & HALF BREAKER SYSTEM ADOPTED IN GISSYSTEM ADOPTED IN GIS

DS : DISCONNECTOR SWITCH, GS: GROUNDING SWITCH, CT: CURRENT TRANSFORMER, VD: VOLTAGE DIVIDER


1-1/2 CB SYSTEM (SIEMENS VATECH)

VDVD

VDVD


CT CT CT CT CT CT

VDVD

DSDSDSDSDSDS

GS

GS

GS

GS

GS

GS

GS

GS

CB CB CB


3-89

BUS-1 BUS-2

1-89


1-89A

11--52CB52CB

1-CT

3-89A

33--52CB52CB

3-CT

2-CT

P2

P1

P2

P1

P1 P2

LINE 1

22--52CB52CB

1L-CT

2-89A 2-89B

1-89L 3-89T

T/F-1

3T-CTP2

P1

P2

P1

CORECORE 11--CTCT 11--LCTLCT 22--CTCT 33--TCTTCT 33--CTCT

CORECORE--1 1

(PS)(PS)




(87BB1M1)(87BB1M1)

TEED PROTTEED PROT--11(BAY 1&2)(BAY 1&2)






(87BB2M1)(87BB2M1)


CORECORE--2 2

(PS)(PS)




(87BB1M2)(87BB1M2)







(87BB2M2)(87BB2M2)

CORECORE--3 3

(0.2)(0.2)BCU (L)BCU (L)

ENERGY ENERGY METER (L)METER (L)

BCU (L)BCU (L)ENERGY ENERGY

METER (HV)METER (HV)

SPARE SPARE

BCU (HV) BCU (HV) Bushing CTBushing CT

CORECORE--4 4 TEED PROTTEED PROT--22MAINMAIN--22

PROTECTIONPROTECTIONTEED PROTTEED PROT--22(BAY 1&2) +(BAY 1&2) +

BACKUPBACKUP--ICTICTPROTECTIONPROTECTION

TEED PROTTEED PROT--22CORECORE--4 4

(PS)(PS)TEED PROTTEED PROT--22

(BAY 1&2)(BAY 1&2)PROTECTIONPROTECTION(21 L2 / 87L2)(21 L2 / 87L2)

(BAY 1&2) +(BAY 1&2) +TIE LBBTIE LBB

PROTECTIONPROTECTION(67 HV)(67 HV)


CORECORE--5 5

(PS)(PS)TEED PROTTEED PROT--11

(BAY 1&2)(BAY 1&2)

MAINMAIN--11PROTECTIONPROTECTION

(21L1/87L1)(21L1/87L1)


MAIN1MAIN1--ICT ICT



(87T1)(87T1)


Paralleling of 2Nos CTs to the Main-1/Main-2/Backup line protection is not required. This gives better transient response. Separate STUB protection can be connected (Nothing BUT TEED Protection).

ONE & HALF BREAKER SYSTEMONE & HALF BREAKER SYSTEM(5CT METHOD)(5CT METHOD)

87B

B1M

1B

U

87B

B1M

2B

U

87 T

EE

D

87 T

EE

D

87 T

EE

D

87 T

EE

D

87 T

EE

D

87 T

EE

D

87 T

EE

D

87 T

EE

D87B

B2M

1B

U

87B

B2M

2B

U

BU

S-1

BU

S-2

LBB

87B

B1M

1

87B

B1M

2

BC

U (L

)

87 T

EE

D-1

(1&

2)

87 T

EE

D-2

(1&

2)

87 T

EE

D-1

(2&

3)

87 T

EE

D-2

(2&

3)

87 T

EE

D-1

(1&

2)

87 T

EE

D-2

(1&

2)

87 T

EE

D-1

(2&

3)

87 T

EE

D-2

(2&

3)

BC

U (L

)

SP

AR

E

87B

B2M

1

87B

B2M

2

87 TEED-2 (1&2)

EM (L)

87 TEED-2 (3&2)

EM (HV)

MAIN1:87T1

B/U: 67HV

MA

IN1:8

7T

1

B/U

: 67LV

MAIN1:21L1 / 87L1

MAIN2: 21L2/87L2

ICT

MA

IN2:8

7T

2

87 TEED-1 (1&2)

87 TEED-2 (1&2)

87 TEED-1 (3&2)

87 TEED-2 (3&2)

MA

IN1:8

7T

1

B/U

: 67LV

BC

U (

HV

)


BU

S-1

BCUBCU


87 TEED1 (BAY 1&2)87 TEED1 (BAY 1&2)

TIE LBB


MAIN2 :87BB1MAIN2 :87BB1 MAIN1: 21L1MAIN1: 21L1


1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

C

E

87 TEED2 (BAY 1&2)87 TEED2 (BAY 1&2)

LINE C

E


BUSBAR


1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16


C

E

EMEM


BU

S-2

87 TEED1 (BAY 2&3)87 TEED1 (BAY 2&3)

87 TEED2 (BAY 2&3)87 TEED2 (BAY 2&3)



EMEM

B/U: 67HVB/U: 67HV

50Z +87BB


1

2

9

10


1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16


C

E

ICT


C

E


BUSBAR

3

4

5

6

7

8

11

12

13

14

15

16

C

E

B/U: 67LVB/U: 67LV

ONE & HALF BREAKER SYSTEMONE & HALF BREAKER SYSTEM(5CT METHOD) (5CT METHOD) –– ICT ICT –– BUSHING CT PROTECTIONBUSHING CT PROTECTION


BCU((HV)BCU((HV)



33--PH HIGH IMPEDANCEPH HIGH IMPEDANCE

33--PH LOW IMPEDANCEPH LOW IMPEDANCE


87BB1

CVT

VBB1

79

25

BF

VL1 / VL2

OR VBB2

VBB1

CVT VL1

87L 21M2VL1

BUSBARBUSBAR--1121M1 VL1

87 TD1 HZ

87 TD2 LZ

.

79

25

FEEDER1 / LINE1

FEEDER2 / LINE2

BF

VL1 / VBB1

VL2 / VBB2

87BB2

CVT

VBB279

25VBB2

BF

VL2 / VL1

OR VBB1

FEEDER2 / LINE2

CVT VL2

BUSBARBUSBAR--22

MAIN-1

MAIN-2


87 TD1 HZ

87 TD2 LZ

.



3-89

BUS-1 BUS-2

1-89


1-89A

11--52CB52CB

1-CT

3-89A

33--52CB52CB

3-CT

2B-CT

P2

P1

P2

P1

P1 P2P2 P12A-CT

LINE 1

22--52CB52CB2-89A 2-89B

1-89L 3-89T

T/F-1

P2

P1

P2

P11L-CT 3T-CT

11--CTCT 1L1L--CTCT 2A2A--CTCT 2B2B--CTCT 3T3T--CTCT 33--CTCT

CORECORE--1 1

(PS)(PS)

MAIN1 MAIN1

BUSBARBUSBAR--1 1



(87BB1M1)(87BB1M1)

TEED TEED

PROTPROT--11

(BAY 1&2)(BAY 1&2)

SPARESPARE SPARESPARE

TEED TEED

PROTPROT--11

(BAY 2&3)(BAY 2&3)

MAIN1 MAIN1

BUSBARBUSBAR--2 2



(87BB2M1)(87BB2M1)


(87BB1M1)(87BB1M1) (87BB2M1)(87BB2M1)

CORECORE--2 2

(PS)(PS)

MAIN2 MAIN2

BUSBARBUSBAR--1 1



(87BB1M2)(87BB1M2)

TEED TEED

PROTPROT--22

(BAY 1&2)(BAY 1&2)

TIE LBBTIE LBB SPARESPARE

TEED TEED

PROTPROT--22

(BAY 2&3)(BAY 2&3)

MAIN2 MAIN2

BUSBARBUSBAR--2 2



(87BB2M2)(87BB2M2)

CORECORE--3 3

(0.2)(0.2)BCU (L)BCU (L)

ENERGY ENERGY

METERMETER

BCUBCU

(HV)(HV)

BCU (L)BCU (L) ENERGY ENERGY

METERMETER

BCUBCU

(HV)(HV)

CORECORE--4 4

(PS)(PS)

TEED TEED

PROTPROT--22

(BAY 1&2)(BAY 1&2)

MAINMAIN--22


(21L2/87L2)(21L2/87L2)

TEED TEED

PROTPROT--22

(BAY 2&3)(BAY 2&3)

TEED TEED

PROTPROT--22

(BAY 1&2)(BAY 1&2)

BACKUPBACKUP--ICTICT


(67 HV)(67 HV)

TEED TEED

PROTPROT--22

(BAY 2&3) (BAY 2&3)

CORECORE--5 5

(PS)(PS)

TEED TEED

PROTPROT--11

(BAY 1&2)(BAY 1&2)

MAINMAIN--11


(21L1/87L1)(21L1/87L1)

TEED TEED

PROTPROT--11

(BAY 2&3)(BAY 2&3)

TEED TEED

PROTPROT--11

(BAY 1&2)(BAY 1&2)

MAIN1 MAIN1 -- ICT ICT DIFFERENTIALDIFFERENTIAL

PROTECTIONPROTECTION

(87T1)(87T1)

TEED TEED

PROTPROT--11

(BAY 2&3)(BAY 2&3)


87B

B1M

1B

U

87B

B1M

2B

U

87 T

EE

D

87 T

EE

D

87 T

EE

D

87 T

EE

D

87 T

EE

D

87 T

EE

D

87 T

EE

D

87 T

EE

D87B

B2M

1B

U

87B

B2M

2B

U

BU

S-1

BU

S-2

LBB

87B

B1M

1

87B

B1M

2

BC

U (L

)

87 T

EE

D-1

(1&

2)

87 T

EE

D-2

(1&

2)

87 T

EE

D-1

(2&

3)

87 T

EE

D-2

(2&

3)

87 T

EE

D-1

(1&

2)

87 T

EE

D-2

(1&

2)

87 T

EE

D-1

(2&

3)

87 T

EE

D-2

(2&

3)

BC

U (L

)

BC

U(H

V)

87B

B2M

1

87B

B2M

2

87 TEED-2 (1&2)

EM (L)

87 TEED-2 (3&2)

EM (HV)

MAIN1:87T1

B/U: 67HV

MA

IN1:8

7T

1

B/U

: 67LV

MAIN1:21L1 / 87L1

MAIN2: 21L2/87L2

BC

U (H

V)

ICT

MA

IN2:8

7T

2

87 TEED-1 (1&2)

87 TEED-2 (1&2)

87 TEED-1 (3&2)

87 TEED-2 (3&2)

MA

IN1:8

7T

1

B/U

: 67LV


BU

S-1

BCUBCU

87 TEED1 (BAY 1&2)87 TEED1 (BAY 1&2)

TIE LBB





87 TEED2 (BAY 1&2)87 TEED2 (BAY 1&2)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

C

E

LINE C

E


BUSBAR


1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16


C

E

EMEM


BU

S-2

87 TEED1 (BAY 2&3)87 TEED1 (BAY 2&3)

87 TEED2 (BAY 2&3)87 TEED2 (BAY 2&3)

BCU(HV)BCU(HV)



EM(HV)EM(HV)

B/U: 67HVB/U: 67HV

50Z +87BB


1

2

9

10


1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16


C

E

ICT


C

E


BUSBAR

3

4

5

6

7

8

11

12

13

14

15

16

C

E

B/U: 67LVB/U: 67LV


87BB1

CVT

VBB1

79

25

BF

VL1 / VL2

OR VBB2

VBB1

CVT VL1

87L 21M2VL1


87 TD1 HZ

87 TD2 LZ

.FEEDER1 / LINE1

FEEDER2 / LINE2

BF

79

25VL1 / VBB1

VL2 / VBB2

87BB2

CVT

VBB279

25VBB2

BF

VL2 / VL1

OR VBB1

FEEDER2 / LINE2

CVT VL2

BUSBARBUSBAR--22

MAIN-1

MAIN-2


87 TD1 HZ

87 TD2 LZ

.



3-89

BUS-1 BUS-2

1-89

P1P11A-CT 3A-CT


1-89A

11--52CB52CB

1B-CT

3-89A

33--52CB52CB

3B-CT

2B-CT

P2

P1

P2

P1

P2 P1P1 P2

P1

P2

P1

P21A-CT

2A-CT

3A-CT

LINE 1

22--52CB52CB2-89A 2-89B

1-89L 3-89T

T/F-1

P2

P11L-CT

P2

P1

3T-CT


1B1B--CTCT 1A1A--CTCT 1L1L--CTCT 2B2B--CTCT 2A2A--CTCT 3T3T--CTCT 3A3A--CTCT 3B3B--CTCT

CORECORE--1 1

(PS)(PS)

MAIN1 MAIN1

BUSBARBUSBAR--1 1


LBB IN BUILT LBB IN BUILT

TEEDPROTTEEDPROT--11

(BAY 1&2)(BAY 1&2)

TEED PROTTEED PROT--11

(BAY 1&2)(BAY 1&2)


(BAY 1&2)(BAY 1&2)


(BAY 2&3)(BAY 2&3)


(BAY 2&3)(BAY 2&3)


(BAY 2&3)(BAY 2&3)

MAIN1 MAIN1

BUSBARBUSBAR--2 2


LBB IN BUILT LBB IN BUILT (PS)(PS) LBB IN BUILT LBB IN BUILT

(87BB1M1(87BB1M1))

(BAY 1&2)(BAY 1&2) (BAY 1&2)(BAY 1&2) (BAY 1&2)(BAY 1&2) (BAY 2&3)(BAY 2&3) (BAY 2&3)(BAY 2&3) (BAY 2&3)(BAY 2&3) LBB IN BUILT LBB IN BUILT

(87BB2M1)(87BB2M1)

CORECORE--2 2

(PS)(PS)

MAIN2 MAIN2

BUSBARBUSBAR--1 1



(87BB1M2)(87BB1M2)


(BAY 1&2)(BAY 1&2)


(BAY 1&2)(BAY 1&2)


(BAY 1&2)(BAY 1&2)


(BAY 2&3)(BAY 2&3)


(BAY 2&3)(BAY 2&3)


(BAY 2&3)(BAY 2&3)

MAIN2 MAIN2

BUSBARBUSBAR--2 2



(87BB2M2)(87BB2M2)

CORECORE--3 3

(0.2)(0.2)BCU (L) SPARESPARE

ENERGY ENERGY

METER (L)METER (L)BCU (L) BCU (HV)

ENERGY ENERGY

METER (HV)METER (HV)SPARESPARE BCU (HV)

(0.2)(0.2)

CORECORE--4 4

(PS)(PS)

TEED-1 FOR

BAY-1 & 2 IS:

1L-CT, 1A-CT & 2A-CT

TEED-2 FOR

BAY-1 & 2 IS:

1L-CT, 1B-CT & 2B-CT

MAINMAIN--2 2

LINE LINE PROTECTIONPROTECTION

(21L2/87L2)(21L2/87L2)

MAIN1MAIN1--ICT ICT

DIFFFERENTIALDIFFFERENTIAL


(87T1)(87T1)

TEED-1 FOR

BAY-2 & 3 IS:

3T-CT, 3A-CT & 2B-CT

TEED-2 FOR

BAY-2 & 3 IS:

3T-CT, 3B-CT & 2A-CT

CORECORE--5 5

(PS)(PS)

MAINMAIN--1 1

LINE LINE


(21L1/87L1)(21L1/87L1)

B/UB/U--ICT ICT PROTECTIONPROTECTION

(67 HV)(67 HV)


87B

B1M

1B

U

87B

B1M

2B

U

87 T

EE

D

87 T

EE

D

87 T

EE

D

87 T

EE

D

87 T

EE

D

87 T

EE

D

87 T

EE

D

87 T

EE

D87B

B2M

1B

U

87B

B2M

2B

U

BU

S-1

BU

S-2

LBB

87B

B1M

1

87B

B1M

2

BC

U (L

)

87 T

EE

D-1

(1&

2)

87 T

EE

D-2

(1&

2)

87 T

EE

D-1

(2&

3)

87 T

EE

D-2

(2&

3)

87 T

EE

D-1

(1&

2)

87 T

EE

D-2

(1&

2)

87 T

EE

D-1

(2&

3)

87 T

EE

D-2

(2&

3)

BC

U (L

)

BC

U(H

V)

87B

B2M

1

87B

B2M

2

87 TEED-2 (1&2)

EM (L)

87 TEED-2 (3&2)

EM (HV)

MAIN1:87T1

B/U: 67HV

MA

IN1:8

7T

1

B/U

: 67LV

MAIN1:21L1 / 87L1

MAIN2: 21L2/87L2

BC

U (H

V)

ICT

MA

IN2:8

7T

2

87 TEED-1 (1&2)

87 TEED-2 (1&2)

87 TEED-1 (3&2)

87 TEED-2 (3&2)

MA

IN1:8

7T

1

B/U

: 67LV


BU

S-1

BCUBCU

87 TEED1 (BAY 1&2)87 TEED1 (BAY 1&2)

TIE LBB





87 TEED2 (BAY 1&2)87 TEED2 (BAY 1&2)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

C

E

LINE C

E


BUSBAR


1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16


C

E

EMEM


BU

S-2

87 TEED1 (BAY 2&3)87 TEED1 (BAY 2&3)

87 TEED2 (BAY 2&3)87 TEED2 (BAY 2&3)

BCU(HV)BCU(HV)



EM(HV)EM(HV)

B/U: 67HVB/U: 67HV

50Z +87BB


1

2

9

10


1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16


C

E

ICT


C

E


BUSBAR

3

4

5

6

7

8

11

12

13

14

15

16

C

E

B/U: 67LVB/U: 67LV


87BB1

CVT

VBB1

79

25

BF

VL1 / VL2

OR VBB2

VBB1

CVT VL1

87L 21M2VL1


87 TD1 HZ

87 TD2 LZ

.

.

FEEDER1 / LINE1

FEEDER2 / LINE2

BF

79

25VL1 / VBB1

VL2 / VBB2

87BB2

CVT

VBB279

25VBB2

BF

VL2 / VL1

OR VBB1

FEEDER2 / LINE2

CVT VL2

BUSBARBUSBAR--22

MAIN-1

MAIN-2


87 TD1 HZ

87 TD2 LZ

.




1A1A--CTCT

1B1B--CTCT

2A2A--CTCT

2B2B--CTCT

3B3B--CTCT

3A3A--CTCT1L1L--CTCT 3T3T--CTCT

4A4A--CTCT

4B4B--CTCT

5A5A--

5B5B--

6B6B--CTCT

6A6A--CTCT4L4L--CTCT 6T6T--CTCT

CTCT

CTCT

--CTCT

--CTCT

CTCT

CTCT4L4L--CTCT 6T6T--CTCT

NUMERICAL BUSBAR SCHEME INCL LBB/BFR/CBFNUMERICAL BUSBAR SCHEME INCL LBB/BFR/CBF(DECENTRALISED & CENTRALISED ARCHITECTURE)(DECENTRALISED & CENTRALISED ARCHITECTURE)

BU/PU

(REB 500) ABB

DECENTRALISED CONCEPT CENTRALISED CONCEPT

FO

BU/PU

OR

OR

(7 SS 52) SIEMENS

ORFO

OR

(REB 670) ABB

(487B) SEL

BU/PU

OR

(MICOM P740) AREVA

LBB INBUILT FEATUREBU / PU TO BUSBAR

DIGITAL COMMUNICATION

FO

(MICOM P746) AREVA

LBB INBUILT FEATURE

ADOPTED CT METHODS IN ANDHRA PRADESHADOPTED CT METHODS IN ANDHRA PRADESH

CT METHODSCT METHODS SUBSTATIONSUBSTATION UTILITYUTILITY

3 CT METHOD3 CT METHOD WARANGALWARANGAL POWERGRIDPOWERGRID

4 CT METHOD4 CT METHOD MALKARAMMALKARAM APTRANSCOAPTRANSCO4 CT METHOD4 CT METHOD MALKARAMMALKARAM APTRANSCOAPTRANSCO

6 CT METHOD 6 CT METHOD NOT AVAILABLE IN INDIANOT AVAILABLE IN INDIA

5 CT METHOD5 CT METHOD NUNNANUNNA POWERGRIDPOWERGRID

6 CT METHOD6 CT METHOD SIMHADRISIMHADRI NTPCNTPC6 CT METHOD6 CT METHOD SIMHADRISIMHADRI NTPCNTPC

8 CT METHOD8 CT METHOD NOT AVAILABLE IN INDIANOT AVAILABLE IN INDIA

BUS SECTIONBUS SECTION NELLORENELLOREAPTRANSCO/APTRANSCO/

POWERPOWERGRIDGRID

COMPARISION BETWEEN DIFFERENT CT METHODSCOMPARISION BETWEEN DIFFERENT CT METHODSCT CT

PURPOSEPURPOSE3 CT 3 CT

METHODMETHOD4 CT 4 CT

METHODMETHOD6 CT 6 CT

METHODMETHOD5 CT5 CT



METHODMETHOD

MAIN1 & MAIN1 & MAIN2 MAIN2

BUSBAR BUSBAR


1 CT1 CT 1 CT1 CT 1B CT1B CT 1 CT1 CT 1 CT1 CT 1B CT1B CT

ABOVE FOR BUSABOVE FOR BUS--1 & BELOW FOR BUS1 & BELOW FOR BUS--22

3 CT3 CT 3 CT3 CT 3B CT3B CT 3 CT3 CT 3 CT3 CT 3B CT3B CT

MAINMAIN--1 1 1 1 -- CT & 2 CT & 2 -- CT CT 1 CT & 2 B 1 CT & 2 B -- CTCT 1 A 1 A –– CT & 2 B CT & 2 B –– CTCT 1 L 1 L -- CTCT 1 L 1 L -- CTCT 1 L 1 L -- CTCT

MAINMAIN--1 1 MAINMAIN--2 2


BCU & EMBCU & EM

1 L 1 L -- CTCT 1 L 1 L -- CTCT 1 L 1 L -- CTCT

ABOVE CT SECONDARIES ARE CONNECTED PARALLEL FOR FEEDERABOVE CT SECONDARIES ARE CONNECTED PARALLEL FOR FEEDER--1 1

BELOW CT SECONDARIES ARE CONNECTED PARALLEL FOR FEEDERBELOW CT SECONDARIES ARE CONNECTED PARALLEL FOR FEEDER--22

ABOVE FOR FEEDERABOVE FOR FEEDER--1 1

BELOW FOR FEEDERBELOW FOR FEEDER--22

3 3 -- CT & 2 CT & 2 –– CTCT 3 3 -- CT & 2 A CT & 2 A -- CTCT 3 A 3 A -- CT & 2 A CT & 2 A -- CTCT 3 L 3 L -- CTCT 3 L 3 L -- CTCT 3 L 3 L –– CTCT

ADDITIONAL ADDITIONAL


AVAILABLEAVAILABLE

STUBSTUB--1 & STUB1 & STUB--2 PROTECTION 2 PROTECTION FOR LINE & AT/F FOR LINE & AT/F

TEEDTEED--1 & TEED1 & TEED--2 PROTECTION 2 PROTECTION FOR LINE & AT/F FOR LINE & AT/F

STUBSTUB--1 & STUB1 & STUB--2 PROTECTION IS INBUILT PROTECTION 2 PROTECTION IS INBUILT PROTECTION

FOR MAINFOR MAIN--1 & MAIN1 & MAIN--2 RELAYS. STUB PROTECTION 2 RELAYS. STUB PROTECTION

WORKS WHEN LINE ISOLATOR OPEN CONDITION ONLY.WORKS WHEN LINE ISOLATOR OPEN CONDITION ONLY.

TEEDTEED––1 IS HIGH IMPEDENCE DIFFERENTIAL RELAY & 1 IS HIGH IMPEDENCE DIFFERENTIAL RELAY &

TEEDTEED--2 IS LOW IMPEDENCE DIFFERENTIAL RELAY. 2 IS LOW IMPEDENCE DIFFERENTIAL RELAY.

BLIND BLIND ZONEZONE

A FAULT BETWEEN CIRCUIT BREAKERS AND CT (END FAULT) MAY THEN STILL BE FED FROM ONE SIDE EVEN WHEN THE BREAKER A FAULT BETWEEN CIRCUIT BREAKERS AND CT (END FAULT) MAY THEN STILL BE FED FROM ONE SIDE EVEN WHEN THE BREAKER HAS BEEN OPENED. CONSEQUENTLY, FINAL FAULT CLEARING BY CASCADED TRIPPING HAS TO BE ACCEPTED IN THIS CASE. THIS HAS BEEN OPENED. CONSEQUENTLY, FINAL FAULT CLEARING BY CASCADED TRIPPING HAS TO BE ACCEPTED IN THIS CASE. THIS SITUATION LBB/BFR OPERATES AND TIME TAKEN TO CLEAR FAULT IS ABOUT 300 SITUATION LBB/BFR OPERATES AND TIME TAKEN TO CLEAR FAULT IS ABOUT 300 mSECsmSECs. THIS IS BLIND ZONE AREA.. THIS IS BLIND ZONE AREA.

ADVANTAGESADVANTAGES

MINIMUM CT MINIMUM CT

METHODMETHOD

TIE CB BLIND ZONE TIE CB BLIND ZONE

AREA IS TAKEN AREA IS TAKEN

CARE. CARE.

MAIN CB & TIE CB MAIN CB & TIE CB

BLIND ZONE AREA IS BLIND ZONE AREA IS

TAKEN CARETAKEN CARE

BLIND ZONE FOR BLIND ZONE FOR

MAIN CB & TIE CBMAIN CB & TIE CB

TIE CB BLIND ZONE TIE CB BLIND ZONE

AREA IS TAKEN AREA IS TAKEN

CARECARE

GOOD PROTECTION GOOD PROTECTION

SYSTEMSYSTEM

WHEN THE FAULT IS TAKEN PLACE BETWEEN THE WHEN THE FAULT IS TAKEN PLACE BETWEEN THE MAIN CB, TIE CB & LINE ISOLATOR, DURING SERVICE MAIN CB, TIE CB & LINE ISOLATOR, DURING SERVICE ONLY, DISTANCE SCHEME SHOULD TAKE CAREONLY, DISTANCE SCHEME SHOULD TAKE CARE..

WHEN THE FAULT IS TAKEN PLACE BETWEEN THE WHEN THE FAULT IS TAKEN PLACE BETWEEN THE MAIN CB, TIE CB & LINE ISOLATOR, TEED PROTECTION MAIN CB, TIE CB & LINE ISOLATOR, TEED PROTECTION SHOULD TAKE CARE. SHOULD TAKE CARE.

ADVANTAGES & DISADVANTAGES OF ONE & HALF BREAKER SYSTEM ADVANTAGES & DISADVANTAGES OF ONE & HALF BREAKER SYSTEM AA.. ADVANTAGESADVANTAGES::1. THREE CIRCUIT BREAKERS IN A FULL DIA ARE ALWAYS IN CLOSED POSITION.

2. IF MAIN CB PROBLEM / FOR PERIODICAL MAINTANENCE, DURING THAT PERIOD THE FEEDER IS

FEEDING FROM TIE CB & OTHER BUS . NEED NOT REQUIRE TRANSFER THE FEEDER.

3. IF TIE CB PROBLEM / FOR PERIODICAL MAINTANENCE, DURING THAT PERIOD THE FEEDER IS

FEEDING FROM MAIN CB & CONNECTED BUS.

4. EVEN IF BOTH MAIN BREAKERS UNDER TROUBLE, DURING THAT PERIOD ONE FEEDER WORKS AS

INCOMING AND OTHER FEEDER WORKS AS OUTGOING VIA TIE CB. (WITHOUT INTERUPTION TOINCOMING AND OTHER FEEDER WORKS AS OUTGOING VIA TIE CB. (WITHOUT INTERUPTION TO

FEEDERS)

5. IF BUSBAR-1 OPERATED / FOR PERIODICAL MAINTANENCE, ONLY THE MAIN BREAKERS

CONNECTED TO BUSBAR-1 WILL TRIP. DURING THAT PERIOD THE FEEDERS CONNECTED TO BUS-1

ARE FEEDING VIA TIE CB FROM BUS-2.

6. IF BUSBAR-2 OPERATED / FOR PERIODICAL MAINTANENCE, ONLY THE MAIN BREAKERS

CONNECTED TO BUSBAR-2 WILL TRIP. DURING THAT PERIOD THE FEEDERS CONNECTED TO BUS-2

ARE FEEDING VIA TIE CB FROM BUS-1.

7. IN THIS BUSBAR PROTECTION IS SIMPLE AND NEED NOT REQUIRE SELECTION OF ISOLATOR.

8. IT IS MORE RELIABLE SYSTEM FOR OPERATION & MAINTANENCE POINT OF VIEW.8. IT IS MORE RELIABLE SYSTEM FOR OPERATION & MAINTANENCE POINT OF VIEW.

BB.. DISADVANTAGESDISADVANTAGES1. CT CONNECTIONS & PROTECTION TRIP LOGICS ARE SOME WHAT COMPLICATED. COMPLEX

CONTROL & PROTECTION PHILOSOPHY

2. COST TOWARDS CTs, CIRCUIT BREAKERS & PANELS ARE TO BE INCREASED DUE TO EXTRA BAY.

THE COST COMPARISION TABLE SHOWN IN NEXT PRESENTATION.

3. THE OPERATIONS FOR OPERATOR POINT OF VIEW IS LITTLE BIT COMPLICATED WHEN COMPARED

TO CONVENTIONAL SYSTEM.

4. SPACE OCUPATION FOR BAY IS MORE i.e COST OF LAND IS INCREASE.

COST COMPARISION BETWEEN CONVENTIONAL SYSTEM COST COMPARISION BETWEEN CONVENTIONAL SYSTEM & ONE AND HALF BREAKER SYSTEM FOR FEEDER & ONE AND HALF BREAKER SYSTEM FOR FEEDER

S.NoS.No EQUIPMENTEQUIPMENTCONVENTIONAL CONVENTIONAL

SYSTEMSYSTEM


FULL DIAFULL DIA

(FOR 2 FEEDERS)(FOR 2 FEEDERS)

% INCREASE% INCREASE

IN COSTIN COST

HALF DIAHALF DIA

(FOR 1 FEEDER)(FOR 1 FEEDER)

% INCREASE % INCREASE

IN COSTIN COST

1.1.CIRCUIT CIRCUIT

BREAKERSBREAKERS1 No 3 Nos 50% 2 Nos 100%

BREAKERSBREAKERS

2.2.

CURRENT CURRENT

TRANSFORMERSTRANSFORMERS

1 Set

INCLUDES THE COST OF CT MARSHELLING BOXES.

3 CT METHOD3 CT METHOD 3 Sets 50% 2 Sets 100%




8 CT METHOD8 CT METHOD 8 Sets 300% 4 Sets 300%8 CT METHOD8 CT METHOD 8 Sets 300% 4 Sets 300%

3.3.CONTROL & CONTROL &

RELAY PANELSRELAY PANELS

I SET 3 SETS 30% 2 SETS 30%

NORMALLYNORMALLY EXTRAEXTRA PANELPANEL ISIS TIETIE BAYBAY PANELPANEL.. ITIT ISIS ARROUNDARROUND 3030%% COSTCOST OFOF MAINMAINPANELPANEL.. BECAUSEBECAUSE ITIT ISIS NOTNOT HAVINGHAVING PROTECTIONPROTECTION RELAYSRELAYS (( MM--11 && MM--22 ANDAND OTHEROTHERRELAYS)RELAYS) .. ONLYONLY TIETIE CBCB TRIPPINGTRIPPING RELAYSRELAYS && ASSOCIATEDASSOCIATED RELAYS(A/RRELAYS(A/R +LBB)+LBB)..

4. 4.

BAY BAY

MARSHALLING MARSHALLING

BOXES (BMB)BOXES (BMB)

1 No 3 Nos 50% 2 Nos 30%

5.5. CONTROL CABLESCONTROL CABLES 8 KM 30 KM 100% 20 KM 150%

MAINMAIN--1, MAIN1, MAIN--22PROTECTION &PROTECTION &

METERINGMETERINGMETERINGMETERINGFOR LINE FOR LINE

ADOPTED IN ADOPTED IN ONE AND HALFONE AND HALFONE AND HALFONE AND HALF

CIRCUIT BREAKER CIRCUIT BREAKER SCHEMESCHEME PREPARED BY


NORMS OF PROTECTION FOLLOWED IN APTRANSCO NORMS OF PROTECTION FOLLOWED IN APTRANSCO FOR TRANSMISIION LINES & DISTRIBUTION LINES ( FEEDER / LINE PROTECTION )FOR TRANSMISIION LINES & DISTRIBUTION LINES ( FEEDER / LINE PROTECTION )

Sr.NoSr.No VOLTAGE VOLTAGE MAINMAIN-- 1 PROTECTION1 PROTECTION MAINMAIN--2 PROTECTION/ BACKUP PROTECTION2 PROTECTION/ BACKUP PROTECTION

1.1. 11 KV LINES11 KV LINES 2 O/L + E/F ( 51 + 51N )2 O/L + E/F ( 51 + 51N ) --

2.2. 33 KV LINES33 KV LINES 3 O/L + E/F ( 51 + 51N )3 O/L + E/F ( 51 + 51N ) --

3.3. 66 KV LINES66 KV LINES SWITCHED DISTANCE SCHEME SWITCHED DISTANCE SCHEME OROR

NUMERICAL DISTANCE SCHEME (21P+ 21N)NUMERICAL DISTANCE SCHEME (21P+ 21N)DIRECTIONAL O/L & E/F RELAYS WITH HIGH DIRECTIONAL O/L & E/F RELAYS WITH HIGH

SET ( 67 + 67N )SET ( 67 + 67N )4.4. 132 KV LINES132 KV LINES NUMERICAL DISTANCE SCHEME (21P+ 21N)NUMERICAL DISTANCE SCHEME (21P+ 21N) SET ( 67 + 67N )SET ( 67 + 67N )4.4. 132 KV LINES132 KV LINES

5.5. 220 KV LINES220 KV LINESNON SWITCHED DISTANCE SCHEME NON SWITCHED DISTANCE SCHEME OROR

NUMERICAL DISTANCE SCHEME (21P + 21N)NUMERICAL DISTANCE SCHEME (21P + 21N)

SWITCHED DISTANCE SCHEME SWITCHED DISTANCE SCHEME OROR

NUMERICAL DISTANCE SCHEME (21P+ 21N)NUMERICAL DISTANCE SCHEME (21P+ 21N)

6.6. 400 KV LINES400 KV LINESNUMERICAL DISTANCE SCHEME (21P + 21N) NUMERICAL DISTANCE SCHEME (21P + 21N)

+ in BUILT DEF RELAY(67N)+ in BUILT DEF RELAY(67N)NUMERICAL DISTANCE SCHEME (21) NUMERICAL DISTANCE SCHEME (21) OROR LINE LINE DIFFERENTIAL SCHEME (87L) WITH B/U 21DIFFERENTIAL SCHEME (87L) WITH B/U 21

7.7. 765 KV LINES765 KV LINESNUMERICAL DISTANCE SCHEME (21P + 21N) NUMERICAL DISTANCE SCHEME (21P + 21N)

+ in BUILT DEF RELAY(67N)+ in BUILT DEF RELAY(67N)NUMERICAL DISTANCE SCHEME (21) NUMERICAL DISTANCE SCHEME (21) OROR LINE LINE DIFFERENTIAL SCHEME (87L) WITH B/U 21DIFFERENTIAL SCHEME (87L) WITH B/U 21

IFIF MAINMAIN--11 && MAINMAIN--22 AREARE NUMERICALNUMERICAL RELAYS,RELAYS, BOTHBOTH SHOULDSHOULD BEBE SEPARATESEPARATE MEASURINGMEASURING PRINCIPLESPRINCIPLES (CHARECTERESTICS),(CHARECTERESTICS), MODELSMODELSIFIF MAINMAIN--11 && MAINMAIN--22 AREARE NUMERICALNUMERICAL RELAYS,RELAYS, BOTHBOTH SHOULDSHOULD BEBE SEPARATESEPARATE MEASURINGMEASURING PRINCIPLESPRINCIPLES (CHARECTERESTICS),(CHARECTERESTICS), MODELSMODELSANDAND ALGORITHAMSALGORITHAMS (SHOULD(SHOULD NOTNOT BEBE DUPLICATED)DUPLICATED) ANDAND ALLALL FEATURESFEATURES SHOULDSHOULD BEBE AVAILABLEAVAILABLE ININ BOTHBOTH SCHEMESSCHEMES ANDAND BOTHBOTH RELAYSRELAYSSHOULDSHOULD BEBE 100100%% REDENDENCYREDENDENCY ININ ALLALL ASPECTSASPECTS (( COMPLEMENTARYCOMPLEMENTARY TOTO EACHEACH OTHEROTHER )) .. DISSIMILARDISSIMILAR CARRIERCARRIER SCHEMESSCHEMES AREARE TOTO BEBESELECTEDSELECTED (( POTTPOTT && PUTTPUTT oror BLOCKBLOCK && UNBLOCK)UNBLOCK).. OTHEROTHER WISEWISE MAINMAIN--22 MAYMAY BEBE DIFFERENTDIFFERENT MAKEMAKE OROR PHASEPHASE COMPARISIONCOMPARISIONPROTECTION/LINEPROTECTION/LINE DIFFERENTIALDIFFERENTIAL PROTECTIONPROTECTION WITHWITH BACKUPBACKUP DISTANCEDISTANCE PROTECTIONPROTECTION ISIS TOTO BEBE ADOPTEDADOPTED.. BOTHBOTH MM11 && MM22 SHOULDSHOULDCONTAINCONTAIN DIRECTIONALDIRECTIONAL EARTHEARTH FAULTFAULT PROTECTIONPROTECTION ((6767N)N) WITHWITH DIRECTIONALDIRECTIONAL COMPARISIONCOMPARISION PICKUPPICKUP SCHEMESCHEME ASAS INBUILTINBUILT FUNCTIONFUNCTION........

ZONEZONE--1: 80% OF MAIN LINE1: 80% OF MAIN LINEZONEZONE--2: 100% OF MAIN LINE + 50% OF SHORTEST LINE AT OTHER END2: 100% OF MAIN LINE + 50% OF SHORTEST LINE AT OTHER ENDZONEZONE--3: 100% OF MAIN LINE + 100% OF SHORTEST LINE AT OTHER END3: 100% OF MAIN LINE + 100% OF SHORTEST LINE AT OTHER ENDZONEZONE--4: 100% OF MAIN LINE + (100% OF SHORTEST LINE + 20% OF LONGEST LINE)4: 100% OF MAIN LINE + (100% OF SHORTEST LINE + 20% OF LONGEST LINE) AT OTHER END.AT OTHER END.

MAINMAIN--1 PROTECTION FOR LINE (21L1)1 PROTECTION FOR LINE (21L1)(3/4/6 CT METHOD)(3/4/6 CT METHOD)

3 3 3

IR5 / A511

IY5 / A531

IB5 / A551

IN5 / A571

1-CT

CORE-5

CTR: 2000-1000-500/1A

CLASS: PS

5S4 5S4 5S4

5S25S2 5S2

P2P2P2 CT MB

VR11 / E111

VY11 / E131

VB11 / E151

VN11 / E171

1-CVT

CORE – 1

2-BCT

CT MB

CORE – 1

100VA

CLASS: 3P

3 C

T M

ET

HO

D :

1-C

T

& 2

-CT

4 C

T M

ET

HO

D :

1-C

T

& 2

-BC

T

6 C

T M

ET

HO

D :

1-A

CT

& 2

-BC

T

3 3 3

2-BCT

CORE-5

CTR: 2000-1000-500/1A

CLASS: PS

P2P2P2

5S4 5S4 5S4

5S25S2 5S2

MAINMAIN--1 PROTECTION FOR LINE (21L1)1 PROTECTION FOR LINE (21L1)(3/4/6 CT METHOD) (NEW DEVELOPMENT)(3/4/6 CT METHOD) (NEW DEVELOPMENT)

3 3 3

IR5 / A511

IY5 / A531

IB5 / A551

IN5 / A571

1-CT

CORE-5

CTR: 2000-1000-500/1A

CLASS: PS

5S4 5S4 5S4

5S25S2 5S2

P2P2P2 CT MB

VR11 / E111

VY11 / E131

VB11 / E151

VN11 / E171

1-CVT

CORE – 1

100VA

CLASS: 3P

IA =250.10 A

IB =250.10 A

IC =250.10 A

VAB =400.0 KV

VBC =400.0 KVCLASS: PS

CT MB

VBC =400.0 KV

VCA =400.0 KV

ESC ENT

ENABLED

TRIPTARGET RESET

3 C

T M

ET

HO

D :

1-C

T

& 2

-CT

4 C

T M

ET

HO

D :

1-C

T

& 2

-BC

T

6 C

T M

ET

HO

D :

1-A

CT

& 2

-BC

T

3 3 3

2-BCT

CORE-5

CTR: 2000-1000-500/1A

CLASS: PS

P2P2P2

5S4 5S4 5S4

5S25S2 5S2

INSTTIMECOMMSOTF

ZONE1ZONE2ZONE3ZONE4

PH-APH-BPH-CGND

5051

79 RESET

79 LOCKOUT

SEL- 421PROTECTION

AUTOMATION

CONTROL

SELIR5 / A511

IY5 / A531

IB5 / A551

IN5 / A571


IR5 / A511

IY5 / A531

IB5 / A5511-LCT

P2P2P2 CT MB

VR11 / E111

VY11 / E131

VB11 / E151

3 3 3

IB5 / A551

IN5 / A571

CORE-5

CTR: 2000-1000-500/1A

CLASS: PS

5S4 5S4 5S4

5S25S2 5S2

VB11 / E151

VN11 / E171

1-CVT

CORE – 1

100VA

CLASS: 3P

MAINMAIN--2 PROTECTION FOR LINE 2 PROTECTION FOR LINE (21L2) (21L2) (3/4/6 CT METHOD)(3/4/6 CT METHOD)

3 3 3

IR4 / C411

IY4 / C431

IB4 / C451

IN4 / C471

1-CT

CORE-4

CTR: 2000-1000-500/1A

CLASS: PS

4S4 4S4 4S4

4S24S2 4S2

P2P2P2 CT MB

VR21 / E211

VY21 / E231

VB21 / E251

VN21 / E271

1-CVT

21 L2

CLASS: PS

CT MB

1-CVT

CORE – 2

100VA

CLASS: 3P

3 C

T M

ET

HO

D :

1-C

T

& 2

-CT

4 C

T M

ET

HO

D :

1-C

T

& 2

-BC

T

6 C

T M

ET

HO

D :

1-A

CT

& 2

-BC

T

3 3 3

2-BCT

CORE-4

CTR: 2000-1000-500/1A

CLASS: PS

P2P2P2

4S4 4S4 4S4

4S24S2 4S2

50ZT

LBB/BFR

MAINMAIN--2 PROTECTION FOR LINE (21L2)2 PROTECTION FOR LINE (21L2)(3/4/6 CT METHOD) ( NEW DEVELOPMENT)(3/4/6 CT METHOD) ( NEW DEVELOPMENT)

3 3 3

IR4 / C411

IY4 / C431

IB4 / C451

IN4 / C471

1-CT

CORE-4

CTR: 2000-1000-500/1A

CLASS: PS

4S4 4S4 4S4

4S24S2 4S2

P2P2P2 CT MB

VR21 / E211

VY21 / E231

VB21 / E251

VN21 / E271

1-CVT

CORE – 2

100VA

CLASS: 3P

CLASS: PS

CT MB

3 C

T M

ET

HO

D :

1-C

T

& 2

-CT

4 C

T M

ET

HO

D :

1-C

T

& 2

-BC

T

6 C

T M

ET

HO

D :

1-A

CT

& 2

-BC

T

3 3 3

2-BCT

CORE-4

CTR: 2000-1000-500/1A

CLASS: PS

P2P2P2

4S4 4S4 4S4

4S24S2 4S2

IR4 / C411

IY4 / C431

IB4 / C451

IN4 / C471

MULTI FUNCTION NUMERICAL RELAY FOR MULTI FUNCTION NUMERICAL RELAY FOR MULTI BREAKER, MULTI CT & CVT/PT APPLICATION MULTI BREAKER, MULTI CT & CVT/PT APPLICATION

(NEW APPLICATION) (ONE & HALF BREAKER SYSTEM or RING BUS SYSTEM)(NEW APPLICATION) (ONE & HALF BREAKER SYSTEM or RING BUS SYSTEM)

1-52 CB 2-52 CB 3-52 CB33 33 33 33

33 33 33 33

BUS-1 PT

1-52,2-52: MAIN & TIE CIRCUIT BREAKER21P: PHASE DISTANCE PROTECTION21N: GROUND DISTANCE PROTECTION

27: UNDER VOLTAGE RELAY

67P

50 BF-1 50 BF-2

21N

79-1

21P 50P 51P27

59

33 33

33 3333 33

33 33

BUS-1 PT BUS-2 PT

25-179-2 25-2

67N50N 51N

LINE

27: UNDER VOLTAGE RELAY67: DIRECTIONAL RELAY50: INST OVER CURRENT RELAY51: TIME OVER CURRENT RELAY59: OVER VOLTAGE RELAY

64: EARTH FAULT RELAY50BF-1: LBB/BFR OF MAIN CB50BF-2: LBB/BFR OF TIE CB79-1,2: AUTO RECLOSURE RELAY OF

MAIN & TIE CB

25-1,2: CHECK SYNCHRONISAM RELAYFOR MAIN & TIE CB

21N

3333

3333

LINE CVT

67N50N 51N


IR4 / C411

IY4 / C431

IB4 / C4511-LCT

P2P2P2 CT MB

VR21 / E211

VY21 / E231

VB21 / E251

3 3 3

IB4 / C451

IN4 / C471

CORE-4

CTR: 2000-1000-500/1A

CLASS: PS

4S4 4S4 4S4

4S24S2 4S2

VB21 / E251

VN21 / E271

1-CVT

CORE – 2

100VA

CLASS: 3P

BAY CONTROL UNIT (BCU) & ENERGY METERBAY CONTROL UNIT (BCU) & ENERGY METER(3/4/6 CT METHOD)(3/4/6 CT METHOD)

3 3 3

IR3 / D311

IY3 / D331

IB3 / D351

IN3 / D371

1-CT

CORE-3

CTR: 2000-1000-500/1A

3S4 3S4 3S4

3S23S2 3S2

P2P2P2 CT MB

3 3 3

IN3 / D371CTR: 2000-1000-500/1A

CLASS: 0.2

3S23S2 3S2

CT MBVR31 / E311

VY31 / E3313 C

T M

ET

HO

D :

1-C

T

& 2

-CT

4 C

T M

ET

HO

D :

1-C

T

& 2

-BC

T

6 C

T M

ET

HO

D :

1-A

CT

& 2

-BC

T

3 3 3

2-BCT

CORE-3

CTR: 2000-1000-500/1A

CLASS: 0.2

3S4 3S4 3S4

3S23S2 3S2

VY31 / E331

VB31 / E351

VN31 / E371

1-CVT

CORE – 3

50VA

CLASS: 0.2P2P2P2

3 C

T M

ET

HO

D :

14 C

T M

ET

HO

D :

1

6 C

T M

ET

HO

D :

1

3 3 3

IR3 / D311

IY3 / D331

IB3 / D3511-LCT

CORE-3

CTR: 2000-1000-500/1A

3S4 3S4 3S4

3S23S2 3S2

P2P2P2 CT MB

BAY CONTROL UNIT (BCU) & ENERGY METERBAY CONTROL UNIT (BCU) & ENERGY METER(5/6/8 CT METHOD)(5/6/8 CT METHOD)

3 3 3

IN3 / D371

CTR: 2000-1000-500/1A

CLASS: 0.2

3S23S2 3S2

VR31 / E311

VY31 / E331VY31 / E331

VB31 / E351

VN31 / E371

1-CVT

CORE – 3

50VA

CLASS: 0.2

MAINMAIN--1 & MAIN1 & MAIN--22PROTECTION FORPROTECTION FOR

AUTO TRANSFORMER AUTO TRANSFORMER ADOPTED IN ADOPTED IN

ONE AND HALFONE AND HALFCIRCUIT BREAKER CIRCUIT BREAKER



BASICS OF TRANSFORMER PROTECTIONBASICS OF TRANSFORMER PROTECTION1. 1. PURPOSE OF POWER TRANSFORMER PROTECTIONPURPOSE OF POWER TRANSFORMER PROTECTION

POWER T/F PROTECTION IS USUALLY INSTALLED TO DISCONNECT THE T/F AT:

A.A. INTERNAL SHORT CIRCUITS AND EARTH FAULTS IN THE T/F AND ITS CONNECTED CIRCUITS.

B.B. EXTERNAL FAULTS ON OTHER CIRCUITS. (BACK-UP PROTECTION)

C.C. ABNORMAL SERVICE CONDITIONS SUCH AS OVERLOAD & OVER VOLTAGE.

2.2. PROTECTION DEVICES INBUILT OR MOUNTED ON POWER T/FPROTECTION DEVICES INBUILT OR MOUNTED ON POWER T/F

A.A. OIL IMMERSED POWER T/F USUALLY HAVE A GAS DETECTOR AND OIL SURGE. DETECTOR A.A. OIL IMMERSED POWER T/F USUALLY HAVE A GAS DETECTOR AND OIL SURGE. DETECTOR

(BUCHHOLZ ALARAM & TRIP DEVICES), WHICH ARE EXCELLENT FOR DETECTING INTERNAL

FAULTS.

B.B. LOAD TAPCHANGER COMPARTMENTS MAY HAVE A SIMILAR OVER PRESSURE DEVICE.

C.C. TEMPARATURE MONITORS FOR OIL & WINDING PROVIDE GOOD OVER LOAD PROTECTION.

D.D. PRESSURE RELIEF DEVICE IS PROVIDED TO SAFE GUARD THE T/F FROM HIGH PRESURES.

3.3. TRANSFORMER DIFFERENTIAL PROTECTIONTRANSFORMER DIFFERENTIAL PROTECTION

IT IS WIDELY USED AS INSTANTANEOUS PROTECTION FOR SHORT CIRCUIT FAULTS WITH IN

THE DIFFERENTIAL ZONE. THIS IS TREATED AS MAIN-1 PROT FOR T/F.

THE MOST COMMON TYPE OF PROTECTION IS THE CURRENT RESTRAINT TYPE.THE MOST COMMON TYPE OF PROTECTION IS THE CURRENT RESTRAINT TYPE.

SOME TYPE OF DIFFERENTIAL RELAYS REQUIRE INTERPOSING CTs FOR CT RATIO MATCHING

AND/OR PHASE SHIFT.

HIGH IMPEDENCE DIFFERENTIAL PROTECTION CAN BE USED ON AUTO T/F & REACTORS.

IT COVERS ONE GALVANICALLY INTERCONNECTED WINDING (WDG DIFF). BUT NOT A

SEPARATE TERTIARY WINDING.

IT REQUIRES A THREE PHASE SET OF CTs AT THE NEUTRAL SIDE OF WINDING.

87T1: MAIN1 TRANSFORMER DIFFERENTIAL PROTECTION USING CONVENTIONAL CTs

87T2: MAIN2 TRANSFORMER DIFFERENTIAL PROTECTION USING BUSHING CTs

4.4.RESTRICTED EARTH FAULT PROTECTIONRESTRICTED EARTH FAULT PROTECTIONAT/Fs are used to couple EHV Power Networks, If the Ratio of their Voltages is Moderate. An Alternative to

Differential Protection that can be applied to AT/Fs. A Circulating Current System is arranged betweenEqual Ratio Current Transformers in the Two Groups of Line Connections and the Neutral EndConnections. The Line Current Transformers can be connected in Parallel to A Single Element Relay, Thusproviding a Scheme Responsive to Earth Faults Only. If Current Transformers are fitted in Each Phase atthe Neutral End of the Windings and a Three-Element Relay is used, A Differential System can be provided,

giving Full Protection against Phase and Earth Faults. This Provides High-speed Sensitive Protection. It isUnaffected by Ratio Changes on the Transformer due to Tap-changing and is immune to the Effects ofMagnetizing In Rush Current. It does not respond to Interturn Faults. In Addition, This Scheme does notrespond to any Fault in a Tertiary Winding. Unloaded Delta-connected Tertiary Windings are often notProtected.Protected.

55. BACK UP PROTECTIONBACK UP PROTECTIONA VARIETY OF RELAYS ARE AVAILABLE.A.A. OVER CURRENT & EARTH FAULT PROTECTION. ( 50, 50N, 51, 51N, 67, 67N - ANY COMBINATION OF THESE)B.B. UNDER IMPEDENCE / DISTANCE ( Z<)(21T).

C.C. NEUTRAL DISPLACEMENT PROTECTION (Un>).

6.6.OTHER TYPES OF RELAYSOTHER TYPES OF RELAYSA.A. OVER VOLTAGE RELAY (U >).B.B. OVER FLUX/ EXCITATION (V/F >)( INVERSE TIME & DIFENITE TIME). FOR 400KV/220KV & 765/400KV TRANSFORMERS BOTH SIDES( i.e HV & LV) OVER FLUX RELAYS ARE

PROVIDED BECAUSE BOTH SIDES HAVING GRID.C.C. AT/F NEUTRAL CURRENT RELAY (51N).C.C. AT/F NEUTRAL CURRENT RELAY (51N).

NORMALLY ADOPTED POWER TRANSFORMERS CAPACITIES IN 400KV / 220KVNORMALLY ADOPTED POWER TRANSFORMERS CAPACITIES IN 400KV / 220KV

CAPACITY OF CAPACITY OF TRANSFORMERTRANSFORMER

HV HV VOLTAGEVOLTAGE

HV CURRENTHV CURRENT LV VOLTAGELV VOLTAGELV LV

CURRENTCURRENT

315 MVA315 MVA 400 KV400 KV 454.68 A454.68 A 220 KV220 KV 0826.68 A0826.68 A



NORMS OF PROTECTION FOLLOWED BY UTILITIES NORMS OF PROTECTION FOLLOWED BY UTILITIES FOR POWER TRANSFORMERS & AUTO TRANSFORMERSFOR POWER TRANSFORMERS & AUTO TRANSFORMERS

S.NoS.NoCAPACITYCAPACITY

IN IN

MVAMVA

VOLTAGE VOLTAGE RATIO IN RATIO IN

KVKV

T

YPE

MAINMAIN--11 MAINMAIN--22BACK UPBACK UP

PROTECTIONPROTECTION ADDITIONAL ADDITIONAL


SPECIALSPECIAL

PROTECTIONPROTECTIONPROTECTIONPROTECTION HVHVHVHVHVHVHVHV LVLVLVLVLVLVLVLV

11 7.5 & 167.5 & 16 66 / 1166 / 11

2 WIN

DING TRA

NSFORM

ER

87

T1

DIF

FE

RE

NT

IAL

RE

LA

Y

( LO

W IM

PE

DA

NC

E P

ER

CE

NTA

GE

BIA

SE

D P

HA

SE

SE

GR

EG

AT

ED

D

IFF

ER

EN

TIA

L R

EL

AY

PR

INC

IPL

E: M

ER

Z P

RIC

E)

NIL 3 OL +3 OL +

1 EL (51)1 EL (51)

3 OVER LOAD + 1 EA

RTH FAULT

3 OVER LOAD + 1 EA

RTH FAULT

BUCHHOLZ, BUCHHOLZ,

OLTC OSROLTC OSR

64

RE

F IS

1

87

T2 IS

3

(PR

INC

PL

E : C

IRC

UL

AT

ING

CU

RR

EN

T)

227.5 , 16 7.5 , 16 & 25& 25 66 / 3366 / 33

2 WIN

DING TRA

NSFORM

ER (STA

R/STAR)

87

T1

DIF

FE

RE

NT

IAL

RE

LA

Y

( LO

W IM

PE

DA

NC

E P

ER

CE

NTA

GE

BIA

SE

D P

HA

SE

SE

GR

EG

AT

ED

D

IFF

ER

EN

TIA

L R

EL

AY

PR

INC

IPL

E: M

ER

Z P

RIC

E)

1 EL (51)1 EL (51)

3 OVER LOAD + 1 EA

RTH FAULT

3 OVER LOAD + 1 EA

RTH FAULT

RELAY ( 51 )

RELAY ( 51 )

OLTC OSROLTC OSR

OIL TEMPOIL TEMP

WDNG TEMPWDNG TEMP

64

RE

F IS

1-P

H H

IGH

IMP

ED

AN

CE

D

IFF

ER

EN

TIA

L R

EL

AY

87

T2 IS

3-P

H H

IGH

IMP

ED

AN

CE

D

IFF

ER

EN

TIA

L R

EL

AY

(PR

INC

PL

E : C

IRC

UL

AT

ING

CU

RR

EN

T)

22 & 25& 25 66 / 3366 / 33

337.5 , 16 ,7.5 , 16 ,25 & 31.525 & 31.5 132 / 11132 / 11

HV REF (64)

3 OVER LOAD + 1 DIRECTION

AL


AL

EARTH FA

ULT RELAY ( 51P + 67N

)EA

RTH FAULT RELA

Y ( 51P + 67N

)

4416 , 31.5 16 , 31.5 50 & 8050 & 80 132 / 33 132 / 33

BUCHHOLZBUCHHOLZ

OVER FLUX OVER FLUX

55 31.5, 5031.5, 50 220 / 33220 / 33

6631.5, 50 & 31.5, 50 &

100100 220 / 66220 / 66HV & LV

(STAR/STA

R)

87

T1

DIF

FE

RE

NT

IAL

RE

LA

Y

( LO

W IM

PE

DA

NC

E P

ER

CE

NTA

GE

BIA

SE

D P

HA

SE

SE

GR

EG

AT

ED

D

IFF

ER

EN

TIA

L R

EL

AY

PR

INC

IPL

E: M

ER

Z P

RIC

E)

3 OVER LOAD + 1 EA

RTH FAULT

3 OVER LOAD + 1 EA

RTH FAULT

PH

HIG

H IM

PE

DA

NC

E

PH

HIG

H IM

PE

DA

NC

E

(PR

INC

PL

E : C

IRC

UL

AT

ING

CU

RR

EN

T)


AL


AL

EARTH FA

ULT RELAY ( 51P + 67N

)EA

RTH FAULT RELA

Y ( 51P + 67N

)

OVER FLUX OVER FLUX

OLTC OSROLTC OSR

PRV/PRDPRV/PRD

OIL TEMPOIL TEMP

WDNG TEMPWDNG TEMP

100100 HV & LV REF 64

77100, 200 100, 200 & 250& 250 400 / 132400 / 132

3 OL + 3 OL + 1 DIR EL 1 DIR EL (51P + (51P + 67N)67N)8 8 100 & 160100 & 160 220 / 132220 / 132

ICT / AUTO TFR

87 T2 / 64 REF

OVER LOAD OVER LOAD

ALARM ALARM

RELAY + RELAY +

NEUTRAL NEUTRAL

CURRENT E/F CURRENT E/F

RELAYRELAY

99 315, 500 315, 500 & 630 & 630 400 / 220400 / 220

3 DIR OL 3 DIR OL (HIGHSET) (HIGHSET)

+ + 1 DIR EL1 DIR EL

(HIGHSET)(HIGHSET)

3 DIR OL 3 DIR OL (HIGHSET) (HIGHSET)

+ + 1 DIR EL1 DIR EL

(HIGHSET)(HIGHSET)1010 1000 & 1000 &

15001500 765 / 400765 / 400

ICT BUSHING CT INFORMATIONICT BUSHING CT INFORMATIONS.No ITEM /MVA HV IV NEUTRAL LV

1 CORE 1 2 3 1 2 3 1 2 3

2 RATIO

100 600/1 300/1

- -

600/1 500/1

- -

600/1 600/1

- -160 800/1 500/1 800/1 800/1 800/1 800/1

315 1000/1 600/1 1000/1 1000/1 1000/1 1000/1

500 1600/1 1000/1 1600/1 1600/1 1600/1 1600/1500 1600/1 1000/1 1600/1 1600/1 1600/1 1600/1

NEUTRAL BUSHING CT : CORE-1 & 2 : BEFORE STAR FORMATION IN RYB PHASES,

3

VKNEE

FOR PS &

VA FOR MET

100 600 V 600 V

Param

eters of W

TI C

T fo

r each w

indin

g sh

all

be p

rovid

ed b

y th

e contracto

r.

600 V 600 VP

arameters o

f WT

I CT

for each

win

din

g sh

all be p

rovid

ed b

y th

e contracto

r600 V 600 V

Param

eters of W

TI C

T fo

r each w

indin

g sh

all be p

rovid

ed b

y th

e contracto

r

160 800 V 800 V 800 V 800 V 800 V 800 V

315 1000 V 1000 V 1000 V 1000 V 1000 V 1000 V

500 1600V 1600V 1600 V 1600 V 1600 V 1600 V

4 RCT IN OHMS

100 1.5 1.5 1.5 1.5 1.5 1.5

160 2.0 2.0 2.0 2.0 2.0 2.0

315 2.5 2.5 2.5 2.5 2.5 2.5

Param

eters of W

TI C

T fo

r each w

indin

g sh

all

be p

rovid

ed b

y th

e contracto

r.

Param

eters of W

TI C

T fo

r each w

indin

g sh

all be p

rovid

ed b

y th

e contracto

r

Param

eters of W

TI C

T fo

r each w

indin

g sh

all be p

rovid

ed b

y th

e contracto

r

500 4.0 4.0 4.0 4.0 4.0 4.0

5I MAG IN mA at VKNEE

100 100 100 100 100 100 100

160 80 80 80 80 80 80

315 60 60 60 60 60 60

500 25 25 25 25 25 25

6 CLASS OF ACURACY

PS PS PS PS PS PS

7 PURPOSE 87T2(L) 87T2(H) WTI 87T2(L) 87T2(H) WTI 87T2(L) 87T2(H) WTI

SELECTION OF AUX.CTs FOR DIFFERENTIAL PROTECTIONSELECTION OF AUX.CTs FOR DIFFERENTIAL PROTECTION

�� NORMALLY 400KV/220KV AUTO TRANSFORMERS ARE OF CAPACITY 315MVA.NORMALLY 400KV/220KV AUTO TRANSFORMERS ARE OF CAPACITY 315MVA.�� FOR MERZ PRICE PROTECTION IF TRANSFORMER IS CONNECTED IN STAR/STARFOR MERZ PRICE PROTECTION IF TRANSFORMER IS CONNECTED IN STAR/STAR

THEN CT SECONDARIES ARE TO BE CONNECTED IN DELTA/DELTA.THEN CT SECONDARIES ARE TO BE CONNECTED IN DELTA/DELTA.�� CORRECT RATIO CTs ARE NOT AVAILABLE, THEN AUX.CTs ARE TO BE PROVIDEDCORRECT RATIO CTs ARE NOT AVAILABLE, THEN AUX.CTs ARE TO BE PROVIDED

FOR ACHEVING SUITABLE CURRENTS.FOR ACHEVING SUITABLE CURRENTS.�� IF AUX CTs ARE USING THEN MAIN CT SECONDARIES ARE CONNECTED IN STAR.IF AUX CTs ARE USING THEN MAIN CT SECONDARIES ARE CONNECTED IN STAR.�� THIS IS BROUGHT TO AUX CTs. AUX CTs PRIMARY IS CONNECTED IN STAR & THIS IS BROUGHT TO AUX CTs. AUX CTs PRIMARY IS CONNECTED IN STAR &

SECONDARIES ARE CONNECTED IN DELTA.SECONDARIES ARE CONNECTED IN DELTA.�� NORMALLY THE RELAY RATED CURRRENT IS 1A.NORMALLY THE RELAY RATED CURRRENT IS 1A.�� AUX.CT s SECONDARIES ARE CONNECTED IN DELTA. FOR ACHIEVING 1A TOAUX.CT s SECONDARIES ARE CONNECTED IN DELTA. FOR ACHIEVING 1A TO

RELAY, AUX.CT SECONDARY CURRENT IS TO BE 0.577A.RELAY, AUX.CT SECONDARY CURRENT IS TO BE 0.577A.�� THE FULL LOAD PRIMARY CURRENT OF 315MVA AT/F IS 454.7A.THE FULL LOAD PRIMARY CURRENT OF 315MVA AT/F IS 454.7A.�� BUT THE 400KV CTs RATIOs ARE AVAILABLE : 2000BUT THE 400KV CTs RATIOs ARE AVAILABLE : 2000--10001000--500/1A500/1A�� NEAREST VALUE TO FULL LOAD CURRENT IS 500/1A. HENCE IT IS ADOPTED.NEAREST VALUE TO FULL LOAD CURRENT IS 500/1A. HENCE IT IS ADOPTED.�� HENCE AT FULL LOAD HV CURRENT i.e 454.7A, THEN SECONDARY OF CT HENCE AT FULL LOAD HV CURRENT i.e 454.7A, THEN SECONDARY OF CT

CURRENT WILL BE 0.91A.CURRENT WILL BE 0.91A.�� SO HV SIDE AUX.CT RATIO IS 0.91/0.577A.SO HV SIDE AUX.CT RATIO IS 0.91/0.577A.�� SO HV SIDE AUX.CT RATIO IS 0.91/0.577A.SO HV SIDE AUX.CT RATIO IS 0.91/0.577A.�� THE FULL LOAD SECONDARY CURRENT OF 315MVA AT/F IS 826.7A.THE FULL LOAD SECONDARY CURRENT OF 315MVA AT/F IS 826.7A.�� BUT THE 220KV CTs RATIOs ARE AVAILABLE: 1200BUT THE 220KV CTs RATIOs ARE AVAILABLE: 1200--800/1A.800/1A.�� NEAREST VALUE TO FULL LOAD CURRENT IS 1200/1A. HENCE IT IS ADOPTED.NEAREST VALUE TO FULL LOAD CURRENT IS 1200/1A. HENCE IT IS ADOPTED.�� HENCE AT FULL LOAD LV CURRENT i.e 826.7A,THEN SECONDARY OF CT CURRENT HENCE AT FULL LOAD LV CURRENT i.e 826.7A,THEN SECONDARY OF CT CURRENT

WILL BE 0.689A.WILL BE 0.689A.�� SO LV SIDE AUX CT RATIO IS 0.689/0.577A.SO LV SIDE AUX CT RATIO IS 0.689/0.577A.�� SPECIAL INFORMATION:SPECIAL INFORMATION: LATEST NUMERICAL RELAYS NEED NOT REQUIRE AUX LATEST NUMERICAL RELAYS NEED NOT REQUIRE AUX

CTs. IN THESE RELAYS, CT RATIOS MATCHING CAN BE PROGRAMMED.CTs. IN THESE RELAYS, CT RATIOS MATCHING CAN BE PROGRAMMED.

MAIN MAIN --1(87T1) 1(87T1) DIFFERENTIAL PROTECTION FOR ICTDIFFERENTIAL PROTECTION FOR ICT(3/4/6 CT METHOD)(3/4/6 CT METHOD)

3 3 3

3-CT

CORE-5

CTR: 2000-1000-500/1A

CLASS: PS

5S4 5S4 5S4

5S35S3 5S3

P2P2P2 CT MB

3 3 35S1 5S1 5S1

5S35S3 5S3

CT MB87 T187 T1

2-ACT

CT MB

LV-CT

CORE-5

CTR: 1200-800/1A

CLASS: PS

P2P2P2

IN CASE OF 1&1/2 CB SYSTEM, THE DIFFERENTIAL

3 C

T M

ET

HO

D :

3-C

T

&

2-C

T4 C

T M

ET

HO

D :

3-C

T

&

2-A

CT

6 C

T M

ET

HO

D :

3-A

CT

& 2

-AC

T

3 3 3

2-ACT

CORE-5

CTR: 2000-1000-500/1A

CLASS: PS

P2P2P2

5S4 5S4 5S4

5S35S3 5S3

PROTECTION CTs

ASSOCIATED WITH MAIN & TIE CBs SHOULD BE

CONNECTED TO SEPARATE BIAS WINDINGS AND THESE SHOULD NOT BE PARALLED

IN ORDER TO AVOID FALSE OPERATION DUE TO

DISSIMILAR CT TRANSIENT RESPONSE.

NUMERICAL RELAYS DOES NOT REQUIRE AUX CTs

MAINMAIN--1(87T1) 1(87T1) DIFFERENTIAL PROTECTION FOR ICTDIFFERENTIAL PROTECTION FOR ICT(5/6/8 CT METHOD)(5/6/8 CT METHOD)

3-TCT

P2P2P2 CT MB

3 3 35S1 5S1 5S1

5S35S3 5S3

CT MB87 T187 T1

3 3 3

3-TCT

CORE-5

CTR: 2000-1000-500/1A

CLASS: PS

5S4 5S4 5S4

5S35S3 5S3

LV-CT

CORE-5

CTR: 1200-800/1A

CLASS: PS

P2P2P2

NORMALLY LOW NORMALLY LOW IMPEDENCE BIASED

DIFFERENTIAL RELAY IS USED FOR

TRANSFORMER DIFFERENTIAL PROTECTION

NUMERICAL RELAYS DOES NOT REQUIRE AUX CTs

MAIN2 (87T2) : MAIN2 (87T2) : DIFFERENTIAL PROTECTION FOR ICTDIFFERENTIAL PROTECTION FOR ICT

3 3 3

400KV HV

BUSHING CT

CORE-1

CTR: 1000/1A

P2P2P2

S2S2S2

S1S1S1

87 T287 T2

CLASS: PS

3 3 3NEUTRAL

BUSHING CT

CORE-1

CTR: 1000/ 1A

CLASS: PS

P1P1P1

P1P1P1

P2P2P2

S1S1S1

S2S2S2

3 3 3

220KV LV

BUSHING CT

CORE-1

CTR: 1000/1A

CLASS: PS

P2P2P2

P2P2P2

P1P1P1

S2S2S2

S1S1S1


3 3 3

400KV HV

BUSHING CT

CORE-1

CTR: 1000/1A

P2P2P2

S2S2S2

S1S1S1

CLASS: PS

3NEUTRAL

BUSHING CT

CORE-1

CTR: 1000/ 1A

CLASS: PS

P1P1P1

P1

P2

S1

S2

3 3 3

220KV LV

BUSHING CT

CORE-1

CTR: 1000/1A

CLASS: PS

P2P2P2

P1P1P1

S2S2S2

S1S1S1

3 3 3

400KV HV

BUSHING CT

CORE-2

CTR: 1000/1A

P2P2P2

S2S2S2

S1S1S1


87 T287 T2

CLASS: PS

3 3 3NEUTRAL

BUSHING CT

CORE-2

CTR: 1000/ 1A

CLASS: PS

P1P1P1

P1P1P1

P2P2P2

S1S1S1

S2S2S2

ME

TR

OS

IL(N

ON

LIN

EA

RR

ES

IST

OR

)

3 3 3

220KV LV

BUSHING CT

CORE-2

CTR: 1000/1A

CLASS: PS

P2P2P2

P2P2P2

P1P1P1

S2S2S2

S1S1S1

MAINMAIN--2 (64 T) : 2 (64 T) : REF PROTECTION FOR ICTREF PROTECTION FOR ICT

3 3 3

400KV HV

BUSHING CT

CORE-1

CTR: 1000/1A

P2P2P2

S2S2S2

S1S1S1

CLASS: PS

3 3 3NEUTRAL

BUSHING CT

CORE-1

CTR: 1000/ 1A

CLASS: PS

P1P1P1

P1P1P1

P2P2P2

S2S2S2

S1S1S1

METROSIL(NON LINEARRESISTOR)

3 3 3

220KV LV

BUSHING CT

CORE-1

CTR: 1000/1A

CLASS: PS

P2P2P2

P2P2P2

P1P1P1

S2S2S2

S1S1S1

MAINMAIN--2 (64 T) 2 (64 T) : REF PROTECTION FOR ICT: REF PROTECTION FOR ICT

3 3 3

400KV HV

BUSHING CT

CORE-1

CTR: 1000/1A

P2P2P2

S2S2S2

S1S1S1

CLASS: PS

NEUTRAL

BUSHING CT

CORE-1

CTR: 1000/ 1A

CLASS: PS

P1P1P1

METROSIL(NON LINEARRESISTOR)

3P1

P2

S1

S2

3 3 3

220KV LV

BUSHING CT

CORE-1

CTR: 1000/1A

CLASS: PS

P2P2P2

P1P1P1

S2S2S2

S1S1S1

B/U 67 HV B/U 67 HV -- BACKUP PROTECTION FOR ICT HVBACKUP PROTECTION FOR ICT HV(3/4/5 CT METHOD)(3/4/5 CT METHOD)

3 3 3

3-CT

CORE-4

CTR: 2000-1000-500/1A

CLASS: PS

4S4 4S4 4S4

4S34S3 4S3

P2P2P2 CT MB

IR4 / C411

IY4 / C431

IB4 / C451

IN4 / C471

VR11 / E111

VY11 / E131

VB11 / E151

2-ACT

CT MB

CVT

SELECTION

BUS-1 CVT /

BUS-2 CVT /

LINE CVT

3 3 3

3 33

VN11 / E171

E172

E174

3 C

T M

ET

HO

D :

3-C

T

&

2-C

T4 C

T M

ET

HO

D :

3-C

T

&

2-A

CT

6 C

T M

ET

HO

D :

3-A

CT

& 2

-AC

T

3 3 3

2-ACT

CORE-4

CTR: 2000-1000-500/1A

CLASS: PS

P2P2P2

4S4 4S4 4S4

4S34S3 4S3

CORE-2

VA : 100

CLASS: 3P

IR4 / C411

IY4 / C431

IB4 / C451

B/U 67 HV B/U 67 HV -- BACKUP PROTECTION FOR ICT HVBACKUP PROTECTION FOR ICT HV(5/6/8 CT METHOD)(5/6/8 CT METHOD)

P2P2P2 CT MB

VR11 / E111

VY11 / E131

VB11 / E151

3 3 3

3-TCT

CORE-4

CTR: 2000-1000-500/1A

CLASS: PS

4S4 4S4 4S4

4S34S3 4S3

P2P2P2 CT MB

CVT

SELECTION

BUS-1 CVT /

BUS-2 CVT /

LINE CVT

IR4 / C411

IY4 / C431

IB4 / C451

IN4 / C471

3 3 3

3 33

VN11 / E171

E172

E174

CORE-2

VA : 100

CLASS: 3P

B/U 67 LV B/U 67 LV -- BACKUP PROTECTION FOR ICT LVBACKUP PROTECTION FOR ICT LV

3 3 3

LV-CT

CORE-4

CTR: 1200 – 800 /1A

CLASS: PS

4S2 4S2 4S2

4S14S1 4S1

P1P1P1 CT MB

IR4 / C411

IY4 / C431

IB4 / C451

IN4 / C471

VR11 / E111

VY11 / E131

VB11 / E151

P2P2P2

VOLTAGE

SELECTION

BUS-1 PT /

BUS-2 PT

3 3 3

3 33

VN11 / E171

E172

E174

CORE-2

VA : 100

CLASS: 3P

LBB & BUSBARLBB & BUSBARPROTECTIONPROTECTION

SCHEMES SCHEMES SCHEMES SCHEMES ADOPTED INADOPTED IN

ONE AND HALFONE AND HALFCIRCUIT BREAKER CIRCUIT BREAKER CIRCUIT BREAKER CIRCUIT BREAKER



LBB/BFR PROTECTIONLBB/BFR PROTECTION

2-52CB 3-52CBBUS-1 BUS-2

LINE1 AT/F-1

50Z 50Z50ZT

1-52CB

50Z 50Z

� LBB/BFR IS LOCAL BREAKER BACKUP PROTECTION/ BREAKER FAILURE RELAY.� 1No LBB RELAY IS PROVIDED FOR EACH BREAKER.� LBB IS CURRENT OPERATED RELAY.� LBB RELAY IS ENERGISED WHEN MASTER TRIP RELAY(86-A OR/AND 86-B OR/AND 96)

OPERATES OR SINGLE PHASE TRIP RELAYS OPERATES AND GIVEN SIGNAL TO BREAKER FOR TRIP.

� LBB RELAY TIME DELAY IS PROVIDED.

50ZT

� LBB RELAY TIME DELAY IS PROVIDED.� LBB RELAY OPERATES WHEN THE BREAKER IS UNDER TROUBLE/ FAILS TO OPERATE. � AFTER ENERGISED THE LBB RELAY AND TIME DELAY COMPLETES, EVEN CURRENT IS

THERE THIS THINKS BREAKER FAIL TO OPERATE AND GIVEN SIGNAL AS PER SCHEME DESCRIBED NEXT PRESENTATION.

� NEW CONCEPT: Normally the CT connections for LBB/BFR relay is in series withMain-2 Protection. In case of Numerical Distributed LBB/BFR and Centralized Bus-BarSystem, the CT connections for Bus-Bar are terminated at LBB/BFR and CentralizedBus-Bar is interconnected by Fiber-Optic cable.

11--52 CB LBB/BFR OPERATION52 CB LBB/BFR OPERATION

86

86

--AA

BB

LINELINE21L1/21L1/ICTICT

87T187T1

LINELINE21L2/21L2/

86

86

--AA

BB

86

86

--BB 21L2/21L2/ICTICT

87T287T2

86

86

--BB

BUSBAR-1 PROTECTION (96-BB )

OPTD

AND BUSBAR-1 ISOLATED

DIRECT TRIP 1&2VIA CARRIER TO

OTHER END

50Z

TO 96-ZT TRIP RELAYOF TIE CB(2-52CB)

BUS-1 BUS-2

1-52CB 3-52CB2-52CB

TC-1 TC-2

ISOLATED

TC-1TC-2

Breaker Failure Relay of the Main Circuit Breaker Trips the 1. Connected Bus Bar Protection, 2. Tie Circuit Breaker 96/50Z Relay & 3. Remote End Circuit Breaker through Carrier Tripping.

22--52 CB LBB/BFR OPERATION52 CB LBB/BFR OPERATIONLINELINE21L1/21L1/ICTICT

87T187T1

LINELINE

86

86

--AA


87T187T1

LINELINELINELINE21L2/21L2/ICTICT

87T287T2

86

86

--BB


87T287T2

TO 96-BB TRIP RELAYOF LINE CB(1-52CB)

DIRECT TRIP 1&2VIA CARRIER

TO OTHER END

TO 96-BB TRIP RELAYOF AT/F(ICT) CB (3-52CB)

INTER TRIP TOLVCB & TBCCB

50ZT

BUS-1 BUS-2

1-52CB 3-52CB2-52CB

TC-1 TC-2

OF LINE CB(1-52CB) OF AT/F(ICT) CB (3-52CB)

Breaker Failure Relay of the Tie Circuit Breaker Trips the 1. Both Sides Main Circuit Breakers and 2. Remote End Circuit Breakers through carrier Tripping

( In case of Transformer, LV Circuit Breaker)

33--52 CB LBB/BFR OPERATION52 CB LBB/BFR OPERATION

86

86

--AA

BB


87T187T1

LINELINE21L2/21L2/

86

86

--AA

BB

86

86

--BB 21L2/21L2/ICTICT

87T287T2

86

86

--BB

BUSBAR-2 (96 BB)PROTECTION OPTD

AND BUSBAR-2

ISOLATED

INTER TRIP TO LV CB & TBC CB

50Z

TO 96-ZT TRIP RELAYOF TIE CB(2-52CB)

BUS-1 BUS-2

1-52CB 3-52CB2-52CB

TC-1 TC-2 TC-1TC-2

ISOLATED

Breaker Failure Relay of the Main Circuit Breaker Trips the 1. Connected Bus Bar Protection 2. Tie Circuit Breaker 96/50Z Relay & 3. Remote End Circuit Breaker ( In case of ICT, LV CB)

BASICS OF BUSBAR PROTECTIONBASICS OF BUSBAR PROTECTIONNEED FOR BUSBAR PROTECTIONNEED FOR BUSBAR PROTECTION� IN ITS ABSENCE FAULT CLEARING TAKES PLACE IN ZONE-2 OF DISTANCE RELAY BY

REMOTE END TRIPPING.

� THIS MEANS SLOW AND UNSELECTIVE TRIPPING AND WIDE SPREAD BLACKOUT.

EFFECT OF DELAYED CLEARENCEEFFECT OF DELAYED CLEARENCE� GREATER DAMAGE AT FAULT POINT.

� INDIRECT SHOCK TO CONNECTED EQUIPMENT LIKE SHAFTS OF GENERATOR AND

WINDINGS OF TRANSFORMER.WINDINGS OF TRANSFORMER.

BASIC THEORYBASIC THEORY� KIRCHOFF’s CURRENT LAW STATES THAT THE SUM OF THE CURRENTS ENTERING A

GIVEN NODE MUST BE EQUAL TO THE CURRENTS LEAVING AT THAT NODE.

BUS BAR PROTECTION SYSTEMSBUS BAR PROTECTION SYSTEMS1. HIGH IMPEDENCE DIFFERENTIAL PROTECTION

2. MODERATE-IMPEDENCE DIFFERENTIAL PROTECTION

3. LOW-IMPEDENCE DIFFERENTIAL PROTECTION

4. NUMERICAL BUS DIFFERENTIAL PROTECTION

HIGH IMPEDENCE DIFFERENCIAL PROTECTIONHIGH IMPEDENCE DIFFERENCIAL PROTECTIONTHE HIGH IMPEDENCE PROTECTION SCHEME, ON THE OTHER HAND, IS A GOOD SOLUTION FOR

SINGLE BUSBAR ARRANGEMENTS , ONE & HALF BREAKER SYSTEMS OR RING BUSBARS, PROVIDING

THAT APPROPRIATE DEDICATED CT CORES ARE AVAILABLE FOR THIS USE ALONE. IT IS SENSTIVE,

STABLE & FAST PROTECTION.

HOWEVER, SPECIAL CT REQUIREMENTS, ADDITIONAL HIGH VOLTAGE DEVICE PROTECTION,

DEMANDING MAINTANENCE etc PUT RESTRICTIONS IN ITS APPLICATIONS.

A MEASURING CIRCUIT COMPRISES A HIGH-IMPEDENCE STABILIZING RESISTOR CONNECTED

ACROSS THE CIRCULATING CURRENT ARRANGEMENT OF ALL THE CTs IN PARALLEL. THE VALUE OF

THE STABILIZING RESISTOR IS CHOOSEN SUCH THAT THE VOLTAGE DROP ACROSS THE RELAY

CIRCUIT IS INSUFFICIENT TO OPERATE THE FAULTS OUTSIDE THE PROTECTED ZONE.

LIMITATIONS OF CONVENTIONAL HIGH IMPEDENCE DIFFERENTIAL RELAYPUTS STRINGENT REQUIREMENTS ON CT’s. Class X for all CT Cores.NEED FOR DEDICATED CT CORES. Separate CT Cores for BUSBAR and CHECK ZONE Protection.IDENTICAL CT RATIO, MAGNETISING IMPEDENCE.AUX CT’s RATIO CORRECTIONS UNACCEPTABLE.IN ABILITY TO COPE WITH INCREASING FAULT CURRENT.SLOW RESPONSE.Advantage of Numerical Protection Technology (e.g. Fault recording, Communication etc) not available.BASIC OPERATING TIME EXCLUDING RELAY TIME IS 15 – 20ms.THIS RELAY REQUIRES CHECK ZONE FEATURE. THE TRIP COMMAND IS ONLY GIVEN WHEN BOTH A DISCRIMINATING & CHECK ZONE SYSTEM OPERATES.BOTH A DISCRIMINATING & CHECK ZONE SYSTEM OPERATES.

MEDIUM IMPEDENCE DIFFERENTIAL PROTECTIONMANY OF THE LIMITATIONS OF HIGH IMPEDENCE PROTECTION CAN BE OVERCOME

USING MODERATE MEDIUM IMPEDENCE PROTECTION (OR STABILIZED HIGH-IMP

SCHEME), WHICH IS A COMBINATION OF THE NORMAL HIGH-IMP AND STABILIZED

DIFFERENTIAL SCHEMES.

LOW IMPEDENCE DIFFERENTIAL PROTECTION LOW IMPEDENCE PROTECTION(PERCENTAGE BIASED BUS DIFFERENTIAL RELAY) IS

MOST SUITABLE PROTECTION SCHEME FOR DOUBLE AND MULTIPLE BUSBAR SYSTEMS

(WITH OR WITHOUT TRANSFER BUS) WITH FEEDERS BEING SWITCHED BETWEEN(WITH OR WITHOUT TRANSFER BUS) WITH FEEDERS BEING SWITCHED BETWEEN

SECTIONS OF BUSBAR, WHICH OPERATES WITH FULL SELECTIVITY FOR ALL POSSIBLE

BUSBAR CONFIGUARATIONS.

ADVANTAGES� FREE OF ANY NEED FOR MATCHED CT CHARACTERESTICS OR RATIOs, LOW

LEAKAGE REACTANCE OR RESISTANCE.

� OTHER PROTECTIVE RELAYS CAN BE INCLUDED IN THE SAME CIRCUIT.

� STABLE FOR INFINITE FAULT LEVELS. INSENSITIVE TO CT SATURATION.

� DETECTS FAULTS WITHIN 1 – 2ms & INITIATES TRIPPING WITHIN 5 – 7ms.

DIFFERENCE BETWEEN BUSBAR SCHEMESDIFFERENCE BETWEEN BUSBAR SCHEMES

DETAILSDETAILS HIGH IMPEDENCE BUSBAR PROTECTIONHIGH IMPEDENCE BUSBAR PROTECTIONPERCENTAGE BIASED LOW IMPEDENCE PERCENTAGE BIASED LOW IMPEDENCE

BUS BAR PROTECTIONBUS BAR PROTECTION

PRINCIPLEPRINCIPLE

THETHE CURRENTSCURRENTS ENTERINGENTERING ANDAND LEAVINGLEAVING THETHE BUSBARBUSBAR AREARE COMPAREDCOMPARED

CONTINUOSLYCONTINUOSLY.. ITIT INVOLVESINVOLVES CHOOSINGCHOOSING OFOF IMPEDENCEIMPEDENCE HIGHHIGH ENOUGHENOUGH

STABLISESTABLISE THETHE RELAYRELAY FORFOR HEAVYHEAVY EXTERNALEXTERNAL FAULTSFAULTS.. THISTHIS ISIS

CIRCULATINGCIRCULATING CURRENTCURRENT PRINCIPLEPRINCIPLE..

ITIT HASHAS DIFFERENTIALDIFFERENTIAL ANDAND BIASBIAS SETTINGSETTING.. THETHE RESULTANTRESULTANT BIASBIAS

ISIS PROPOTIONALPROPOTIONAL TOTO ARITHMATICARITHMATIC SUMSUM OFOF ALLALL CURRENTS,CURRENTS,

WHEREASWHEREAS THETHE OPERATINGOPERATING CURRENTCURRENT ISIS VECTORVECTOR SUMSUM OFOF ALLALL

CIRCUITCIRCUIT CURRENTSCURRENTS..

ITIT REQUIRESREQUIRES ALLALL IDENTICALIDENTICAL CTCT RATIO’sRATIO’s && TURNSTURNS RATIORATIO.. LOWLOW ITIT CANCAN WORKWORK WITHWITH CTsCTs OFOF UNEQUALUNEQUAL RATIOSRATIOS ALSOALSO.. FREEFREE OFOF

CTsCTs

ITIT REQUIRESREQUIRES ALLALL IDENTICALIDENTICAL CTCT RATIO’sRATIO’s && TURNSTURNS RATIORATIO.. LOWLOW

RESISTANCERESISTANCE OFOF SECONDARYSECONDARY WINDINGWINDING.. ClassClass XX forfor allall CTCT CoresCores..

MINIMUMMINIMUM KNEEKNEE POINTPOINT VOLTAGEVOLTAGE OFOF 300300--500500VV..

LOWLOW MAGNETISINGMAGNETISING CURRENT(FEWCURRENT(FEW MILLIAMPS)MILLIAMPS)..

ITIT CANCAN WORKWORK WITHWITH CTsCTs OFOF UNEQUALUNEQUAL RATIOSRATIOS ALSOALSO.. FREEFREE OFOF

ANYANY NEEDNEED OFOF MATCHEDMATCHED CTCT CHARACTERESTICCHARACTERESTIC OROR RATIOsRATIOs LOWLOW

LEAKAGELEAKAGE REACTANCEREACTANCE OROR RESISTANCERESISTANCE.. OTHEROTHER PROTECTIVEPROTECTIVE

RELAYSRELAYS CANCAN BEBE INCLUDEDINCLUDED ININ THETHE SAMESAME CIRCUITCIRCUIT..

BURDENBURDENIMPOSESIMPOSES COMPARATIVELYCOMPARATIVELY HIGHHIGH BURDENBURDEN ONON CTsCTs.. AUXILIARYAUXILIARY CTsCTs

REDUCEREDUCE THETHE PERFORMANCEPERFORMANCE OFOF THETHE SCHEMESCHEME

IMPOSESIMPOSES LESSLESS BURDENBURDEN ONON CTsCTs.. AUXILIARYAUXILIARY CTsCTs HAVEHAVE NONO

EFFECTEFFECT ONON PERFORMANCEPERFORMANCE OFOF SCHEMESCHEME..

CT SATURATIONCT SATURATIONOPERATIONOPERATION OFOF SCHEMESCHEME EVENEVEN WHENWHEN CTsCTs GETGET SATURATEDSATURATED DURINGDURING

INTERNALINTERNAL FAULTSFAULTS..

OPERATIONOPERATION OFOF SCHEMESCHEME EVENEVEN WHENWHEN CTsCTs GETGET SATURATEDSATURATED

DURINGDURING INTERNALINTERNAL FAULTSFAULTS.. INSENSITIVEINSENSITIVE TOTO CTCT SATURATIONSATURATION..

UTILISATIONUTILISATIONITIT ISIS GOODGOOD SOLUTIONSOLUTION FORFOR SINGLESINGLE BUSBARBUSBAR ARRANGEMENTS,ARRANGEMENTS, ONEONE &&

HALFHALF BREAKERBREAKER SYSTEMSSYSTEMS OROR RINGRING BUSBARBUSBAR SYSTEMSSYSTEMS..

MOSTMOST SUITABLESUITABLE FORFOR DOUBLEDOUBLE ANDAND MULTIPLEMULTIPLE BUSBARBUSBAR SYSTEMSSYSTEMS

(( WITHWITH OROR WITHOUTWITHOUT TRANSFERTRANSFER BUS)BUS)..

OPERATING TIMEOPERATING TIMEBASICBASIC OPERATINGOPERATING TIMETIME EXCLUDINGEXCLUDING RELAYRELAY TIMETIME ISIS 1515 –– 2020 mSmS.. DETECTSDETECTS FAULTSFAULTS WITHWITH ININ 11 ––22 mSmS ANDAND INITIATESINITIATES TRIPPINGTRIPPING

WITHWITH ININ 55--77 mSmS..

STABILITYSTABILITY INABILITYINABILITY TOTO COPECOPE WITHWITH INCREASINGINCREASING FAULTFAULT CURRENTCURRENT.. STABLESTABLE FORFOR INFINITEINFINITE FAULTFAULT LEVELLEVEL..

PERFORMANCEPERFORMANCEHIGHLYHIGHLY SENSITIVESENSITIVE FORFOR INTERNALINTERNAL FAULTSFAULTS ANDAND COMPLETELYCOMPLETELY STABLESTABLE

FORFOR EXTERNALEXTERNAL FAULTSFAULTS..

HIGHLYHIGHLY SENSITIVESENSITIVE FORFOR INTERNALINTERNAL FAULTSFAULTS ANDAND COMPLETELYCOMPLETELY

STABLESTABLE FORFOR EXTERNALEXTERNAL FAULTSFAULTS..

ADDITIONAL ADDITIONAL


THISTHIS RELAYRELAY REQUIRESREQUIRES CHECKCHECK ZONEZONE FEATUREFEATURE.. THETHE TRIPTRIP COMMANDCOMMAND ISIS

ONLYONLY GIVENGIVEN WHENWHEN BOTHBOTH AA DISCRIMINATINGDISCRIMINATING && CHECKCHECK ZONEZONE SYSTEMSYSTEM

OPERATESOPERATES..

THISTHIS RELAYRELAY HASHAS ININ BUILTBUILT CHECKCHECK ZONEZONE FEATUREFEATURE (NO(NO SEPARATESEPARATE

CHECKZONECHECKZONE FEATURE)FEATURE) ii..ee OVEROVER CURRENTCURRENT STARTINGSTARTING RELAYRELAY

PROVIDEDPROVIDED..

BUS BAR MAINBUS BAR MAIN--1 & MAIN1 & MAIN--2 PROTECTION2 PROTECTION(ANY CT METHOD)(ANY CT METHOD)

3 3 3

IY1 / B131

IB1 / B151

IN1 / B1711-CT

CORE-1

CTR: 2000-1000/1A

CLASS: PS

1S3 1S3 1S3

1S11S1 1S1

P2P2P2 CT MB

BUS BAR

PROTECTION

FOR

BUS-1

IR1 / B111

IY1 / B131CLASS: PS

3-CT

CT MB

IR1 / B111

IY1 / B131

MAINCB LBB IS

PART OF BUSBAR

PROTECTION

3 3 3

3-CT

CORE-1

CTR: 2000-1000/1A

CLASS: PS

P2P2P2

1S3 1S3 1S3

1S11S1 1S1

BUS BAR

PROTECTION

FOR

BUS-2

IB1 / B151

IN1 / B171

ONE AND HALF CB SYSTEM ONE AND HALF CB SYSTEM –– HIGH IMPEDANCEHIGH IMPEDANCE

BUS-1

52

52

52

-52

-52

-52

-52

87BB187BB1--MAIN1 BB1 PROTECTIONMAIN1 BB1 PROTECTION 87BB187BB1--MAIN2 BB1 PROTECTIONMAIN2 BB1 PROTECTION1

-52

2-5

2

4-5

25

-52

7-5

28

-52

10

-11

-52

13

-1

4-5

2

16

-1

7-5

2

19

-2

0-5

2

BUS-2

3-5

2

6-5

2

9-5

2

12

-52

15

-52

18

-52

21

-52

87BB287BB2--MAIN1 BB2 PROTECTIONMAIN1 BB2 PROTECTION 87BB287BB2--MAIN2 BB2 PROTECTIONMAIN2 BB2 PROTECTION

ONE AND HALF CB SYSTEM ONE AND HALF CB SYSTEM –– LOW IMPEDANCELOW IMPEDANCE

87 87 –– BB1 BUS BARBB1 BUS BAR--1 PROTECTION1 PROTECTION

BUS-1

52

-52

-52

-52

-52

52

52

1-C

T

7-5

28

-52

7-C

TC

T

10

-11

-52

10

-CT

CT

13

-1

4-5

2

13

-CT

CT

16

-1

7-5

2

16

-CT

CT

19

-2

0-5

2

19

-CT

CT

CT

2-5

21

-52

4-5

25

-52

4-C

TC

T

87 87 –– BB2 BUS BARBB2 BUS BAR--2 PROTECTION2 PROTECTION

BUS-2

9-5

2

9-C

T

12

-52

12

-CT

15

-52

15

- CT

18

-52

18

-CT

21

-52

21

-CT

3-C

T

3-5

2

6-5

2

6-C

T

NUMERICAL BUSBAR SCHEME INCL LBB/BFR/CBFNUMERICAL BUSBAR SCHEME INCL LBB/BFR/CBF(DECENTRALISED & CENTRALISED CONCEPTS)(DECENTRALISED & CENTRALISED CONCEPTS)

MAIN CB LBB

(REB 500) ABB

DECENTRALISED CONCEPT CENTRALISED CONCEPT

FO

MAIN CB LBB

TIE CB LBB

OR

OR

(7 SS 52) SIEMENS

ORFO

OR

(REB 670) ABB

(487B) SELOR

OR

MAIN CB LBB

OR

(MICOM P740) AREVA

LBB INBUILT FEATURELBB INBUILT FEATURELBB TO BUSBAR

DIGITAL COMMUNICATION

FO

LBB INBUILT FEATURELBB INBUILT FEATURE

(MICOM P746) AREVA

OR

NUMERICAL BUSBAR SCHEME INCL LBB/BFR/CBFNUMERICAL BUSBAR SCHEME INCL LBB/BFR/CBF(DECENTRALISED CONCEPT(DECENTRALISED CONCEPT-- DUPLICATE )DUPLICATE )

MAIN CB LBB

(REB 500) ABB

DECENTRALISED CONCEPT

FO(REB 500) ABB

DECENTRALISED CONCEPT

FO

TIE CB LBB

OR

OR

(7 SS 52) SIEMENSFO

OR

OR

(7 SS 52) SIEMENS

MAIN CB LBB

FO

MAIN CB LBB

OR

(MICOM P740) AREVA

LBB TO BUSBARDIGITAL COMMUNICATION

FO

OR

(MICOM P740) AREVA

LBB TO BUSBARDIGITAL COMMUNICATION

MAIN CB LBB

TIE CB LBB

FO

NUMERICAL BUSBAR SCHEME INCL LBB/BFR/CBFNUMERICAL BUSBAR SCHEME INCL LBB/BFR/CBF(CENTRALISED CONCEPT (CENTRALISED CONCEPT -- DUPLICATE)DUPLICATE)

CENTRALISED CONCEPT CENTRALISED CONCEPT

(REB 670) ABB

(487B) SEL

OR

OR

(REB 670) ABB

(487B) SEL

OR

LBB INBUILT FEATURE LBB INBUILT FEATURE

(MICOM P746) AREVA

OR

(MICOM P746) AREVA

OR

DISTRIBUTED LBB & NUMERICAL CENTRALISED BUS BAR PROTECTIONDISTRIBUTED LBB & NUMERICAL CENTRALISED BUS BAR PROTECTION

BUSBUS--11

1-5

2

4-5

2

7-5

2

10

-52

13

-52

OR OR

(REB 500) ABB (7 SS 52) SIEMENS (MICOM P740) AREVA

12

-52

45

-52

78

-52

10

11

-52

13

14

-52

BUSBUS--22

3-5

2

6-5

2

9-5

2

12

-52

15

-52

OR OR

LATEST DEVELOPMENT IN NUMERICAL DISTRIBUTED BUS BAR PROTECTIONLATEST DEVELOPMENT IN NUMERICAL DISTRIBUTED BUS BAR PROTECTION

ABBABB SIEMENSSIEMENS AREVAAREVA

BUSBAR

PROTECTION

CENTRAL UNIT


c

E


BAY UNIT

LINE

PROTECTION

TRANSFORMER

21 L1 21 L2 21 L1 21 L2 21 L1 21 L2

C

E

ABB Network Partner AG REL531


1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

C

E

TRANSFORMER

PROTECTION

DESCRIPTION

1. IN THIS NO SEPARATE CORE IS REQUIRED FOR EITHER BUSBAR PROTECTION OR LBB / BFR.

2. CENTRALISED BUSBAR IS CONNECTED FROM BAY UNIT OR LBB OR BFR THROUGH FIBRE OPTIC.

3. BAY UNIT / BFR / LBB IS CONNECTED FROM MAIN-1 & MAIN-2 OF LINE PROTECTION OR MAIN &

BACKUP PROTECTION OF TRANSFORMER THROUGH FIBRE OPTIC FOR REDUNDANCY TO BAY UNIT.

4. THE CURRENT DATA IS TRANSFERED TO BAY UNIT TO BUSBAR CENTRAL UNIT FROM LINE /

TRANSFORMER PROTECTIONS FOR NUMIRICAL ALGORITHAM OF LBB & BUSBAR CENTRAL UNIT AND

IT WILL OPERATE FOR INTERNAL FAULTS AND DOES NOT OPERATE FOR THROUGH / EXTERNAL

FAULTS.

87 T1 87 T2 87 T1 87 T2 87 T1 87 T2

C

E

MISCELENEOUSMISCELENEOUSRELAYS & PROTECTIONSRELAYS & PROTECTIONS

ADOPTED FOR LINE INADOPTED FOR LINE INADOPTED FOR LINE INADOPTED FOR LINE INONE AND HALF ONE AND HALF

CIRCUIT BREAKERCIRCUIT BREAKERSCHEME SCHEME SCHEME SCHEME

(STUB, TEED AND AUTO RECLOSURE (STUB, TEED AND AUTO RECLOSURE FUNCTIONS)FUNCTIONS) PREPARED BY


STUBSTUB--1/ STUB1/ STUB--2 PROTECTION2 PROTECTION1-52CB 2-52CB 3-52CBBUS-1 BUS-2

LINE-1 AT/F-1

STUB-1&2(BAY 1&2)

1-89L

REL 521REL 521

DISTANCE / ICT DISTANCE / ICT RELAYS RELAYS

CONVERTED CONVERTED TO STUB/BUS TO STUB/BUS

3-89T

RET 521RET 521

STUB-3&2(BAY 3&2)

WHEN A LINE IS SUPPLIED VIA TWO CIRCUIT BREAKERS IN A ONE & HALF CIRCUIT WHEN A LINE IS SUPPLIED VIA TWO CIRCUIT BREAKERS IN A ONE & HALF CIRCUIT BREAKER ARRANGEMENT, THE LINE PROTECTION INCLUDES THE AREA BETWEEN THE TWO BREAKER ARRANGEMENT, THE LINE PROTECTION INCLUDES THE AREA BETWEEN THE TWO CT’s. HOWEVER, WHEN THE LINE ISOLATOR IS OPEN THE LINE CVT‘s FOR THE DISTANCE CT’s. HOWEVER, WHEN THE LINE ISOLATOR IS OPEN THE LINE CVT‘s FOR THE DISTANCE PROTECTION ARE CONNECTED TO THE LINE AND CANNOT PROVIDE THE CORRECT PROTECTION ARE CONNECTED TO THE LINE AND CANNOT PROVIDE THE CORRECT VOLTAGE FOR THE STUB END.(VOLTAGE FOR THE STUB END.(i.ei.e THE AREA BETWEEN THE LINE ISOLATOR AND CT’s) (STUB THE AREA BETWEEN THE LINE ISOLATOR AND CT’s) (STUB = DEAD END)= DEAD END)

TO PROVIDE PROTECTION FOR A FAULT IN THIS AREA, REL 521/ REL 316 IS TO PROVIDE PROTECTION FOR A FAULT IN THIS AREA, REL 521/ REL 316 IS

REL 521REL 521

REL 316REL 316

TO STUB/BUS TO STUB/BUS OVER LOAD OVER LOAD

RELAYS WHEN RELAYS WHEN LINE ISOLATORLINE ISOLATOR

OPENSOPENS

RET 521RET 521

RET 316RET 316

TO PROVIDE PROTECTION FOR A FAULT IN THIS AREA, REL 521/ REL 316 IS TO PROVIDE PROTECTION FOR A FAULT IN THIS AREA, REL 521/ REL 316 IS PROVIDED WITH A STUB PROTECTION WHICH GIVES AN BUS OVER CURRENT TRIP IF THE PROVIDED WITH A STUB PROTECTION WHICH GIVES AN BUS OVER CURRENT TRIP IF THE LINE ISOLATOR IS OPEN AND THE CURRENT EXCEEDS THE SET VALUE IN ANY PHASE.LINE ISOLATOR IS OPEN AND THE CURRENT EXCEEDS THE SET VALUE IN ANY PHASE.

STUBSTUB--1 1 (BAY 1&2 OR BAY 3&2)(BAY 1&2 OR BAY 3&2)OPERATESOPERATES

IT OPERATES THE 3IT OPERATES THE 3--PH TRIP GRPH TRIP GR--A MAIN CB (1A MAIN CB (1--52CB OR 352CB OR 3--52CB) 52CB)

AND 3AND 3--PH TRIP GRPH TRIP GR--A TIE CB (2A TIE CB (2--52CB)52CB)

STUBSTUB--2 2 (BAY 1&2 OR BAY 3&2)(BAY 1&2 OR BAY 3&2)OPERATESOPERATES

IT OPERATES THE 3IT OPERATES THE 3--PH TRIP GRPH TRIP GR--B MAIN CB (1B MAIN CB (1--52CB OR 352CB OR 3--52CB) 52CB)

AND 3AND 3--PH TRIP GRPH TRIP GR--B TIE CB (2B TIE CB (2--52CB)52CB)

TEEDTEED--1/ TEED1/ TEED--2 PROTECTION2 PROTECTION1-52CB 2-52CB 3-52CBBUS-1 BUS-2

LINE-1 AT/F-1

TEED-1&2(BAY 1&2)

TEED-1&2(BAY 2&3)

TEED PROTECTION IS BASED ON KIRCHOFF’S CURRENT LAW. THREE SETS OF CTSTEED PROTECTION IS BASED ON KIRCHOFF’S CURRENT LAW. THREE SETS OF CTSARE CONNECTED IN STAR FASHION. SOME OF THE CURRENTS MUST BE ZERO. IF ANY ARE CONNECTED IN STAR FASHION. SOME OF THE CURRENTS MUST BE ZERO. IF ANY ARE CONNECTED IN STAR FASHION. SOME OF THE CURRENTS MUST BE ZERO. IF ANY ARE CONNECTED IN STAR FASHION. SOME OF THE CURRENTS MUST BE ZERO. IF ANY UNBALANCE CURRENTS ARE NOTICED THEN IMMEDIATELY TEED PROTECTION UNBALANCE CURRENTS ARE NOTICED THEN IMMEDIATELY TEED PROTECTION OPERATES. IF TEED PROTECTION BAY 1&2 OPERATED THEN IT TRIPS 1OPERATES. IF TEED PROTECTION BAY 1&2 OPERATED THEN IT TRIPS 1--52CB & 252CB & 2--52CB. 52CB. SIMILARLY IF TEED PROTECTION BAY 2&3 OPERATED THEN IT TRIPS 2SIMILARLY IF TEED PROTECTION BAY 2&3 OPERATED THEN IT TRIPS 2--52CB & 352CB & 3--52CB.52CB.

TEEDTEED--11


SUMMATION OF INDIVIDUAL PHASES OF TSUMMATION OF INDIVIDUAL PHASES OF T--SHAPED 3 SHAPED 3

CTs BEFORE REACHING TO RELAY. THIS IS CTs BEFORE REACHING TO RELAY. THIS IS

CIRCULATING CURRENT PRINCIPLE. THE CURRENT CIRCULATING CURRENT PRINCIPLE. THE CURRENT

FLOWING THROUGH IS ZERO DURING BALANCED FLOWING THROUGH IS ZERO DURING BALANCED

CONDITION. CONDITION.

HIGH IMPENDENCE THREE PHASE DIFFERENTIAL HIGH IMPENDENCE THREE PHASE DIFFERENTIAL HIGH IMPENDENCE THREE PHASE DIFFERENTIAL HIGH IMPENDENCE THREE PHASE DIFFERENTIAL

RELAY IS USED AS TEEDRELAY IS USED AS TEED--1 PROTECTION.1 PROTECTION.

TEEDTEED--22


TT-- SHAPED 3 CTs ARE CONNECTED TO RELAY. THE SHAPED 3 CTs ARE CONNECTED TO RELAY. THE

RELAY HAVING OPERATING COIL & RESTAIRING COIL. RELAY HAVING OPERATING COIL & RESTAIRING COIL.

BASED ON THE DIFFERENTIAL CURRENT FLOWING BASED ON THE DIFFERENTIAL CURRENT FLOWING

THROUGH THE OPERATING COIL THE RELAY THROUGH THE OPERATING COIL THE RELAY

OPERATES.OPERATES.

LOW IMPEDENCE PERCENTAGE BIASED THREE LOW IMPEDENCE PERCENTAGE BIASED THREE

TERMINAL THREE PHASE DIFFERENTIAL RELAY IS TERMINAL THREE PHASE DIFFERENTIAL RELAY IS

USED AS TEEDUSED AS TEED--2 PROTECTION.2 PROTECTION.

TEEDTEED--1 PROTECTION1 PROTECTION{BAY1&2} (5/6/8 CT METHOD){BAY1&2} (5/6/8 CT METHOD)

3 3 3

1-CT

CORE-5

CTR: 2000-1000-500/1A

CLASS: PS

P2P2P2

5S4 5S4 5S4

5S25S2 5S2

IT WORKS ON CIRCULATING

CURRENT PRINCIPLE AND

IR5IY5IB5

IN5

87 TEED-1

3 3 32-CT

CORE-5

CTR: 2000-1000-500/1A

CLASS: PS

P1P1P1

P2P2P2

P1P1P1

5S4 5S4 5S4

5S25S2 5S2

CURRENT PRINCIPLE AND

IT IS HIGH IMPEDENCE

DIFFERENTIAL RELAY.

TEED-1 PROTECTION FOR

BAY 2&3 IS ALSO SAME AS

ABOVE AND THE

FOLLOWING CTs & CORES

ARE USED

3-CT(CORE-5), 2-CT(CORE-1)

& 3-TCT(CORE-1) ARE

STARRED AND CONNECTED

IN5

IR5IY5IB5

IN5

3 3 3

1-LCT

CORE-1

CTR: 2000-1000/1A

CLASS: PS

P1P1P1

P1P1P1

P2P2P2

1S3 1S3 1S3

1S21S2 1S2

STARRED AND CONNECTED

TO TEED-1 PROTECTION

IR1IY1IB1

IN1

5 CT METHOD : 1-CT, 2-CT & 1L-CT6 CT METHOD : 1-CT, 2-BCT & 1L-CT8 CT METHOD : 1-ACT, 2-BCT & 1L-CT

TEEDTEED--2 PROTECTION2 PROTECTION{BAY1&2} (5/6/8 CT METHOD){BAY1&2} (5/6/8 CT METHOD)

3 3 3

1-CT

CORE-4

CTR: 2000-1000-500/1A

CLASS: PS

4S4 4S4 4S4

4S24S2 4S2

P2P2P2 CT MB

3 3 34S2 4S2 4S2

4S44S4 4S4

P2P2P2CT MB

87 TEED-2

1-LCT

CORE-2

CT MBP2P2P2

2-CT

CORE-4

CTR: 2000-1000-500/1A

CLASS: PS

TEED-2 PROTECTION FOR BAY 2&3 IS ALSO SAME AS ABOVE AND THE

3 3 3CORE-2

CTR: 2000-1000/1A

CLASS: PS2S2 2S2 2S2

2S32S3 2S3

ABOVE AND THE FOLLOWING CTs & CORES ARE USED. 3-CT(CORE-4), 2-CT(CORE-2) & 3-TCT (CORE-2) ARE CONNECTED TO TEED-2 PROTECTION.IT WORKS ON KIRCHOFF’S CURRENT PRINCIPLE & IT IS PERCENTAGE BIASED LOW IMPEDENCE DIFFERENTIAL RELAY

TEED / STUB PROTECTION TRIP SCHEMETEED / STUB PROTECTION TRIP SCHEME

8686--AAMTR/MTR/HSTRHSTR



STUBOR

TEED-1

C

E

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ABB Network Partner AG REC 316*4

STUBOR

TEED-1

BUS-1 BUS-2

1-52CB 3-52CB2-52CB

HSTRHSTR

ABBABBREL521REL521

8686--BBMTR/MTR/

8686--BBMTR/MTR/

HSTRHSTR

8686--BBMTR/MTR/

HSTRHSTR

TRIP COIL-1 TRIP COIL-1 TRIP COIL-1

TRIP COIL-2 TRIP COIL-2 TRIP COIL-2(BAY 1&2)

(BAY 2&3)

(BAY 2&3)

(BAY 1&2)

TEED-2OR

TEED-2REL521REL521MAINMAIN--11MTR/MTR/HSTRHSTR

MTR/MTR/HSTRHSTR

MTR/MTR/HSTRHSTR

8686--A : GROUPA : GROUP--A MASTER TRIP RELAY / HIGH SPEED TRIP RELAY A MASTER TRIP RELAY / HIGH SPEED TRIP RELAY 8686--B : GROUPB : GROUP--B MASTER TRIP RELAY / HIGH SPEED TRIP RELAYB MASTER TRIP RELAY / HIGH SPEED TRIP RELAY

LINE/TRANSFORMER ISOLATOR OPENS THIS INTERLOCK WILL INITIATE LINE/TRANSFORMER ISOLATOR OPENS THIS INTERLOCK WILL INITIATE

21 L1 / 87 T1 & 21 L2 / 87 T221 L1 / 87 T1 & 21 L2 / 87 T2 CONVERTED STUBCONVERTED STUB--1 & 2 PROTECTION1 & 2 PROTECTION

OR

STUB

TEED-2OR

STUB

AUTO RECLOSURE BASICSAUTO RECLOSURE BASICS� FAULTS ARE THREE TYPES

1. TRANSIENT FAULT: These are cleared by the immediate tripping of Circuit Breakers and do not reoccur when the line is re-energized.

2. SEMI-PERMANENT FAULTS: These require a time interval to disappear before a line is charged again.3. PERMANENT FAULTS: These are to be located and repaired before the line is re-energized.

� About 80-90% of the faults occurring are transient in nature. Hence the Automatic Reclosure of breaker (after tripping on Fault) will result in the line being successfully re-energized.

� ADVANTAGES:A. Decreasing outage time.B. Improving Reliability.C. Improving system stability.

D. Reduce fault damage and Maintenance Time.D. Reduce fault damage and Maintenance Time.� DEAD TIME: The time between the Auto-reclosing Scheme being energized and

the operation of the contacts which energize the Circuit Breaker closing

circuit.� RECLAIM TIME: The Time Following a successful closing operation measured

from the instant the Auto-Reclosing relay closing contacts make which must elapse before the Auto-Reclosing relay initiates another reclosing

attempt. In other words, it may be said to be the time between 1st and 2nd

Auto-Reclosure.

� TYPES OF AUTO-RECLOSING SCHEMES:1. BASED ON PHASE

A. THREE PHASE AUTO-RECLOSING: This type of Auto-Reclosing causes an immediate drift part of the two systems and hence no interchange of synchronizing power can take place during the dead time. B. SINGLE PHASE AUTO-RECLOSING: In this, only the faulty phase(only SLG Faults) is reclosed without causing interruption in interchange synchronizing power between two systems through other two healthy phases.

2. BASED ON ATTEMPTS OF RECLOSUREA. SINGLE SHOT AUTO-RECLOSING: In this scheme, Breaker is reclosed only once on A. SINGLE SHOT AUTO-RECLOSING: In this scheme, Breaker is reclosed only once on a given fault before lockout of Circuit Breaker Occurs. High-Speed Auto-Reclosing for EHT System is invariably Single Shot.B. MULTI-SHOT AUTO-RECLOSING: In this scheme, more than one reclosing attempts made for a given fault before lockout of Circuit Breaker occurs.B.I. DISADVANTAGES: Repeated closure attempts has with high fault level would seriously affect the Circuit Breaker, Equipment and System Stability.B.ii. CIRCUIT BREAKER LIMITATIONS: Ability of Circuit Breaker to Perform several Trip Close operations in quick succession. B. iii. SYSTEM CONDITIONS: In the percentage of the semi-Permanent faults (which could be burnt out) is moderate, For example on the lines through the forest, multi could be burnt out) is moderate, For example on the lines through the forest, multi shot Auto-Reclosing is followed.

3. DEPENDING ON SPEED:A. HIGH-SPEED AUTO-RECLOSING: This aids in fast restoration of supply but should be done by taking into account the following factors.I. System disturbance time can be tolerated without loss of system stability.ii. Characteristics of Protection Schemes and Circuit Breaker. B. LOW SPEED OR DELAYED AUTO RECLOSING: This is suitable for highly inter-connected systems where the loss of a single line is unlikely to cause two sections of the system to drift apart and loose synchronism.

� METHOD OF ADOPTION IN ONE AND HALF BREAKER SYSTEM: The Auto-Reclosure Functions used for the Bus Breakers 1-52CB & 3-52CB are set as Masters and one for the Center Breaker 2-52CB(TIE) as Follower. Co-ordination is required between the Auto-Reclosure Functions. A Synchrocheck function is also loaded in each Relay to permit 3 pole Auto-Reclosing.Each Line Protection relays starts both MAIN & TIE Circuit Breakers to trip for the Concerned line. After a Successful reclosure of the Main Breaker, The Tie Breaker will be reclosed after a supplementary time delay. Should the Main CB Auto-Reclosure relay not be successful in its reclosing attempts, the Tie CB Auto-Reclosure relay not be successful in its reclosing attempts, the Tie CB Auto-Reclosure is blocked. If the Main CB is Open or its Auto-Reclosure Relay is not ready or Out of service, The TIE CB Auto-Reclosure will reclose The TIE Breaker after its own dead time without any supplementary time delay.

� CHOICES OF EHV SYSTEM:1. CHOICE OF DEAD TIME: A. Lower limit is decided by deionising of Circuit Breaker.B. Upper Limit is decided by Transient Stability and Synchronism.C. Longer Transmission Lines Require Longer dead Time.D. The dead time for High Speed Auto-Reclosing scheme with EHV System is 0.3 to 1.2 sec.1.2 sec.2. CHOICE OF RECLAIM TIME:This should not be set to such a low value that the operating cycle of Breaker is exceeded when two faults incident occurs close together. The reclaim time will be in the range of 10 to 30 sec., depending the breaker opening and closing mechanisms.3. CHOICE OF ZONE:This should normally kept in Zone-1. It is a Zone-1 fault and SLG fault only auto-reclosure is comes in to picture. In other zones the auto reclosure is blocked.

AUTOAUTO--RECLOSURE FOR RECLOSURE FOR ONE & HALF BREAKER SCHEMEONE & HALF BREAKER SCHEME

TRIP COMMANDSAUTO RECLOSURE

COMMANDS

1-52CB 2-52CB 3-52CB

79 (A/R)+79 (A/R)+25(SYNC) 25(SYNC) RAAAMRAAAM

RASCRASC


RASCRASC


RASCRASC

LINE-1 LINE-2C

E


21 MAIN-1REL 521

C

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910111213141516


21 MAIN-2REL 316

C

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21 MAIN-1REL 521

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21 MAIN-2REL 316

AUTO RECLOSING TIMING CHARTAUTO RECLOSING TIMING CHARTINSTANT OF FAULT

PROTECTION

TR

AN

SIE

NT

F

AU

LT OPERATING

TIME

OPERATES

TRIP COIL

ENERGISED

CONTACTS

SEPARATE

ARC

EXTINGUISHED

CONTACTS

FULLY OPEN

RESETS

CLOSING COIL

ENERGISED

CONTACTS

MAKE

CONTACTS

FULLY CLOSED

CIRCUIT BREAKERT

RA

NS

IEN

T F

AU

LT

PE

RM

AN

EN

T F

AU

LT

PROTECTION

OPERATING

TIME

OPERATES

TRIP COIL

ENERGISED

CONTACTS

SEPARATE

ARC

EXTINGUISHED

CONTACTS

FULLY OPEN

RESETS

OPENING

TIMEARCING

TIME

OPERATING TIME

CLOSING

TIME

DEAD TIME

CLOSING COIL

ENERGISED

CONTACTS

MAKE

CONTACTS

FULLY CLOSED

RECLOSE

ON TO FAULT

OPERATES

CONTACTS

SEPARATE

ARC

EXTINGUISHED

CONTACTS

FULLY OPEN

RESETS

TIME

AUTO RECLOSERELAY

PE

RM

AN

EN

T F

AU

LT

CIRCUIT BREAKER

OPENING

TIMEARCING

TIME

OPERATING TIME

CLOSING

TIME

DEAD TIME

TRIP COIL

ENERGISED

SYSTEM DISTURBANCE TIME

RECLOSE INITIATED

BY PROTECTION

DEAD TIME CLOSING PULSE TIME

RECLAIM TIME

RELAY READY TO RESPOND

TO FURTHER FAULT INCIDENTS

(AFTER SUCEESFUL RECLOSRE)

CARRIER CARRIER INTERTRIPPING INTERTRIPPING

SCHEMESSCHEMESSCHEMESSCHEMESADOPTED IN ADOPTED IN

ONE AND HALFONE AND HALFCIRCUIT BREAKER CIRCUIT BREAKER CIRCUIT BREAKER CIRCUIT BREAKER

SCHEME SCHEME PREPARED BY


TYPES OF CARRIER TRIPPING SCHEMESTYPES OF CARRIER TRIPPING SCHEMESPERMISSIVE TRIPPINGPERMISSIVE TRIPPING

Permissive trip commands are always monitored by a protectionrelay. The circuit breaker is tripped when receipt of the commandcoincides with operation of the protection relay at the receiving endresponding to a system fault. The receipt of an incorrect signalmust coincide with operation of the receiving end protection for aresponding to a system fault. The receipt of an incorrect signalmust coincide with operation of the receiving end protection for atrip operation to take place. Normally, the risk of a spurious trip islesser. The intention of these schemes is to speed up tripping forfaults occurring within the protected zone.

BLOCKING SCHEMEBLOCKING SCHEMEBlocking commands are initiated by a protection element thatdetects faults external to the protected zone. Detection of anexternal fault at the local end of a protected circuit results in adetects faults external to the protected zone. Detection of anexternal fault at the local end of a protected circuit results in ablocking signal being transmitted to the remote end. At the remoteend, receipt of the blocking signal prevents the remote endprotection operating if it had detected the external fault. Loss of thecommunications channel is less serious for this scheme than inothers as loss of the channel does not result in a failure to trip whenrequired. However, the risk of a spurious trip is higher.

TYPES OF CARRIER TRIPPING SCHEMESTYPES OF CARRIER TRIPPING SCHEMESConventional time-stepped distance protection has One of the main disadvantages is that theinstantaneous Zone 1 protection at each end of the protected line cannot be set to cover the wholeof the feeder length and is usually set to about 80%. This leaves two 'end zones', each being about20% of the protected feeder length. Faults in these zones are cleared in Zone 1 time by theprotection at one end of the feeder and in Zone 2 time (typically 0.25 to 0.5 seconds) by theprotection at the other end of the feeder. This situation cannot be tolerated in some applications,for two main reasons:

I). Faults remaining on the feeder for Zone 2 time may cause the system to become unstable.

II). Where high-speed auto-reclosing is used, the non-simultaneous opening of the circuit.

Breakers at both ends of the faulted section results in no 'dead time' during the auto- reclose cyclefor the fault to be extinguished and for ionized gases to clear. This results in the possibility that atransient fault will cause permanent lockout of the circuit breakers at each end of the line section.

Even where instability does not occur, the increased duration of the disturbance may give rise topower quality problems, and may result in increased plant damage.

Unit schemes of protection that compare the conditions at the two ends of the feedersimultaneously positively identify whether the fault is internal or external to the protected sectionand provide high-speed protection for the whole feeder length. This advantage is balanced by thefact that the unit scheme does not provide the back up protection for adjacent feeders given by adistance scheme.fact that the unit scheme does not provide the back up protection for adjacent feeders given by adistance scheme.

The most desirable scheme is obviously a combination of the best features of both arrangements,that is, instantaneous tripping over the whole feeder length plus back-up protection to adjacentfeeders. This can be achieved by interconnecting the distance protection relays at each end of theprotected feeder by a communications channel.

The purpose of the communications channel is to transmit information about the systemconditions from one end of the protected line to the other, including requests to initiate or preventtripping of the remote circuit breaker. The former arrangement is generally known as a 'transfertripping scheme' while the latter is generally known as a 'blocking scheme'. However, theterminology of the various schemes varies widely, according to local custom and practice.

1. ZONEZONE 11 EXTENSIONEXTENSION SCHEMESCHEME (Z(Z11XX SCHEME)SCHEME)

2. TRANSFERTRANSFER TRIPPINGTRIPPING SCHEMESSCHEMES

I. DIRECT UNDER REACH TRANSFER TRIP SCHEME (DUTT)

II. PERMISSIVE UNDER REACH TRANSFER TRIP SCHEME (PUTT)

III. PUTT – FWD SCHEME

TYPES OF CARRIER TRIPPING SCHEMESTYPES OF CARRIER TRIPPING SCHEMES

III. PUTT – FWD SCHEME

IV. PERMISSIVE UNDER REACH ACCELERATED SCHEME

V. PERMISSIVE OVER REACH TRANSFER TRIP SCHEME (POTT)

VI. WEEK IN FEED CONDITIONS.

3. BLOCKINGBLOCKING OVEROVER REACHINGREACHING SCHEMESSCHEMES

I. BLOCKING OVER-REACHING PROTECTION SCHEME USING ZONE 2.

OR DIRECTIONAL COMPARISION BLOCKING SCHEMEOR DIRECTIONAL COMPARISION BLOCKING SCHEME

II. BLOCKING OVER-REACHING PROTECTION SCHEME USING ZONE 1.

III. WEEK IN FEED CONDITIONS.

4. DIRECTIONAL COMPARISON UNBLOCKING SCHEMEDIRECTIONAL COMPARISON UNBLOCKING SCHEME

OPERATING

MODE

UNDER

REACHING

SENDING

OVER

REACHING

SENDING

PERMISSIVE

CRITERIA

RECEIVING

GENERAL

REQUIREMENTS

PERMISSIVE

UNDER

REACH ZONE-1 - - -

UNDER IMPEDENCE

UNDER VOLTAGE

OVER CURRENT

DISTANE &

SECURE & FAST

PROPERTIES OF COMMAND PROTECTION SYSTEMSPROPERTIES OF COMMAND PROTECTION SYSTEMS

REACH

(PUTT)DISTANE &

DIRECTION

FAST

PERMISSIVE

OVER

REACH

(POTT)

- - - ZONE-2SECURE &

FAST

DIRECT

TRIPZONE-1 - - -

DISTANCE &

DIRECTION

SECURE & DEPENDABLETRIP DIRECTION DEPENDABLE

ACCELERAT

ED UNDER

REACH

ZONE-1 - - - ZONE-2SECURE &

FAST

BLOCKING

OVER

REACH

- - -REVERSE LOCKING

DISTANCE &

DIRECTION

FAST & DEPENDABLE

PARAMETERSPARAMETERS PUTT POTT BLOCKING UNBLOCKING

SignalSignal

TransmissionTransmission

SystemSystem

Dependable and secure communication

channel

1. Power line carrier with frequency shiftmodulation. HF signal coupled to 2 phasesof the protected line, or even better, to aparallel circuit to avoid transmission of

Reliablecommunicationchannel (onlyrequired during

external faults)

1. Power line carrier

Dedicated channel

With continuoussignal Transfer

1. Power line carrierWith frequency shiftkeying. Continuous

PREFFERED APPLICATIONS OF TELE/ CARRIER TRIPPING SCHEMESPREFFERED APPLICATIONS OF TELE/ CARRIER TRIPPING SCHEMES

parallel circuit to avoid transmission ofthe HF signal through the fault location.

2. Microwave radio, especiallydigital(PCM)3. Fibre -optic cables

1. Power line carrierWith amplitudeModulation (ON/OFF).

The same frequency

may be used on all

terminals)

keying. Continuous

Signal transmission

must be permitted.

CharacteristicCharacteristic

Of lineOf line

Best suited for longer lines - where the Under-reach

1. Excellent coverage On short lines in the

All line types –

Preferred practice in the USA.

Same as POTT

Of lineOf line the Under-reach zone provides sufficient resistance coverage.

lines in the Presence of fault

resistance.

2. Suitable for the

Protection of multi-

terminal lines with

intermediate in-feed.

in the USA.

COMPARISION OF TELE/ CARRIER TRIPPING SCHEMESCOMPARISION OF TELE/ CARRIER TRIPPING SCHEMESOn normal two-terminal lines the main deciding factors in the choice of the typeof scheme, apart from the reliability of the signalling channel, operating speedand the method of operation of the system. Table compares the importantcharacteristics of the various types of scheme.

Criterion Transfer Tripping Scheme Blocking scheme

Speed of operation Fast Not as FastSpeed of operation Fast Not as Fast

Speed with in-service testing Slower As fast

Suitable for auto Re Close Yes Yes

Security against mal-operation due to:

Current reversal Special features required Special features required

Loss of communications Poor good

Weak In feed/Open CB Special features required Special features required

Modern digital or numerical distance relays are provided with a choice ofseveral schemes in the same relay. Thus scheme selection is now largelyindependent of relay selection, and the user is assured that a relay is availablewith all the required features to cope with changing system conditions.

PARAMETERS PUTT POTT BLOCKING UNBLOCKING

ADVANTAGESADVANTAGES1. Simple technique2. No coordination Of zones and times With the opposite End required.3.The combination Of different relay

1.1.1.1. Can be applied without Under reaching zone1 stage (e.g. overcompensated Series compensated lines).

2.2.2.2. Can be applied on Extremely short lines (impedance less than minimum relay setting)

3.3.3.3. Better for parallel lines as mutual

Same as POTT Same as POTT

but:

1. If no signal is

Received (no

block and no

unblock) then

ADVANTAGES & DRAWBACKS OF TELE/ CARRIER TRIPPING SCHEMESADVANTAGES & DRAWBACKS OF TELE/ CARRIER TRIPPING SCHEMES

Of different relay Types therefore presents no Problems.

3.3.3.3. Better for parallel lines as mutual coupling is not critical for the overreach zone

4.4.4.4. Weak in feed terminals are no problem. (Echo and Weak In feed logic is included)

unblock) then

tripping by the

overreach zone

is released

after 20 ms

DRAWBACKSDRAWBACKS1. 1. 1. 1. Overlapping of the zone 1 reaches must be ensured. On parallel lines, teed feeders and tapped lines, the influence of zero

1. Zone reach and signal timing coordination with the Remote end is necessary (current reversal).

Same as POTT1. Slow tripping – all Tele-protection trips must be delayed to wait for the eventual

Same as

POTT

influence of zero sequence coupling and intermediate In feeds must be carefully considered to make sure a minimum overlapping of the zone 1 reach is always present.

2.2.2.2. Not suitable for weak

In feed terminals

wait for the eventual blocking signal.2. Continuous channel Monitoring is not Possible.

PARAMETERS PUTT POTT BLOCKING UNBLOCKING

Short LineShort Line

Not Suitable as the Zone1 Operation is essential and Zone1 setting in X and R direction must be small on Short Lines.

Suitable as the Z1B setting may be substantially larger than the Line impedance so that signal Transmission is secure for all faults on the Line.

Suitable as Reverse Reach Setting is independent of Line Length.

Suitable Same as POTT.

ADVANTAGES & DRAWBACKS OF TELE/ CARRIER TRIPPING SCHEMESADVANTAGES & DRAWBACKS OF TELE/ CARRIER TRIPPING SCHEMES

the Line.

Weak InWeak In--feedfeed

Not Suitable as the Zone1 Operation is essential at Both Ends for 100% Coverage.

Suitable as the Strong end detects all the Line Faults with the Over-Reaching Z1B. The Weak In-feed end then echos the received Signal.

Partially Suitableas the Reverse Fault is also Detected at the Weak In-feed end but no trip at Weak In-feed end.

Suitable Same as POTT.

Amplitude Amplitude Modulated Modulated Power Line Power Line

Not Suitable as the Signal must be Trans-mitted through the Fault Location which

Not Suitable same as PUTT.

Suitable as the Signal is only sent when the Line is not Faulted.

Not Suitable Same as PUTT.

Power Line Power Line CarrierCarrier

Fault Location which Attenuates the Signal.

not Faulted.

Frequency or Frequency or Phase Phase

Modulated Modulated Power Line Power Line

CarrierCarrier

Suitable as the Signal can be Transmitted through the Fault Location.

Suitable same as PUTT.

Suitable as the Signal can be Transmitted under all Conditions.

Suitable Same as PUTT.

Communication Communication

independent independent of Power Lineof Power Line

Suitable. Suitable. Suitable. Suitable.

PROTECTION COUPLER PANELPROTECTION COUPLER PANEL

NSD 50/ NSD 50/

11--

2+2+

TXTXTRIP TRIP A(C)A(C)

CS

11--

2+2+

TXTXTRIP TRIP C(A)C(A)

CS

--11250V

DC

250V

DC55

DISPLAY

ACTIVE START TRIP

NSD 50/ NSD 50/ NSD 70NSD 70

2+2+

55--

6+6+

99--

A(C)A(C)

RXRXTRIPTRIPA(C)A(C)

TXTXTRIPTRIP

CS

CR

2+2+

55--

6+6+

99--

C(A)C(A)

RXRXTRIPTRIPC(A)C(A)

TXTXTRIPTRIP

CS

CR

AL

AR

MA

LA

RM

--250V

DC

250V

DC55

66

C

E

G4AC TB: V9LC

1010+

1313--

14+14+

TRIPTRIPB(D)B(D)

RXRXTRIPTRIPB(D)B(D)

S

CR

GA4D TB:V9LC

10+10+

1313--

14+14+

TRIPTRIPD(B)D(B)

RXRXTRIPTRIPD(B)D(B)

S

CR

G4AA TB: V9LB

AL

AR

MA

LA

RM

--22250V

DC

250V

DC77

88

PROTECTION COUPLERS FOR 400KV LINEPROTECTION COUPLERS FOR 400KV LINE

�� FOR EACH LINE 2Nos PROTECTION COUPLER PANELS PROVIDED.FOR EACH LINE 2Nos PROTECTION COUPLER PANELS PROVIDED.�� FOR EACH LINE 1NO CARRIER SPEECH PANEL PROVIDED.FOR EACH LINE 1NO CARRIER SPEECH PANEL PROVIDED.�� SO, ONE LINE REQUIRES TOTAL 3 PANELS.SO, ONE LINE REQUIRES TOTAL 3 PANELS.

�� CARRIER SPEECH PANEL PURELY FOR VOICE COMMUNICATION BETWEEN CARRIER SPEECH PANEL PURELY FOR VOICE COMMUNICATION BETWEEN TWO SUBSTATIONS, TWO SUBSTATIONS, i.ei.e THE LINE CONNECTED SUBSTATIONS.THE LINE CONNECTED SUBSTATIONS.

�� THE VOICE COMMUNICATION ARE TWO METHODS PROVIDED.THE VOICE COMMUNICATION ARE TWO METHODS PROVIDED.�� THE VOICE COMMUNICATION ARE TWO METHODS PROVIDED.THE VOICE COMMUNICATION ARE TWO METHODS PROVIDED.�� ONE IS HOTLINE COMMUNICATION/DEDICATED/ LIFT&TALK METHOD.ONE IS HOTLINE COMMUNICATION/DEDICATED/ LIFT&TALK METHOD.

�� ANOTHER IS DIAL METHOD.ANOTHER IS DIAL METHOD.�� IN PROTECTION COUPLER PANELIN PROTECTION COUPLER PANEL--1 TOTAL 3 CARDS ARE IMPORTANT FOR 1 TOTAL 3 CARDS ARE IMPORTANT FOR

SENDING & RECEIVING TRIP SIGNALS.SENDING & RECEIVING TRIP SIGNALS.

�� ONE CARD FOR ALARM ONE CARD FOR ALARM i.ei.e G4AA. ONE CARD FOR PERMISSIVE/PROTECTION G4AA. ONE CARD FOR PERMISSIVE/PROTECTION TRIP TRIP i.ei.e G4AC & ANOTHER CARD FOR DIRECT TRIPS G4AC & ANOTHER CARD FOR DIRECT TRIPS i.ei.e G4AD.G4AD.

�� IN PROTECTION COUPLERIN PROTECTION COUPLER--2 PANEL ALSO 3 CARDS ARE PROVIDED SIMILAR TO 2 PANEL ALSO 3 CARDS ARE PROVIDED SIMILAR TO PROTECTION COUPLERPROTECTION COUPLER--1 PANEL.1 PANEL.

�� THE PROTECTION COUPLER PANEL DRAWING IS SHOWN IN PREVIOUS MENU.THE PROTECTION COUPLER PANEL DRAWING IS SHOWN IN PREVIOUS MENU.�� THE PROTECTION COUPLER PANEL DRAWING IS SHOWN IN PREVIOUS MENU.THE PROTECTION COUPLER PANEL DRAWING IS SHOWN IN PREVIOUS MENU.�� 1SET TX & RX FOR PERMISSIVE/ PROTECTION TRIP(G4AC)1SET TX & RX FOR PERMISSIVE/ PROTECTION TRIP(G4AC)�� 1SET TX & RX FOR BACKUP FOR PERMISSIVE/ PROTECTION IN ANOTHER 1SET TX & RX FOR BACKUP FOR PERMISSIVE/ PROTECTION IN ANOTHER

PANEL(G4AC).PANEL(G4AC).�� 1SET TX & RX FOR DIRECT TRIP CHANNEL1SET TX & RX FOR DIRECT TRIP CHANNEL--1( G4AD).1( G4AD).�� 1SET TX & RX FOR SPARE UNDER EMERGENCY(G4AD).1SET TX & RX FOR SPARE UNDER EMERGENCY(G4AD).�� THE ABOVE ARRANGEMENT SIMILAR FOR PROTECTION COUPLER PANELTHE ABOVE ARRANGEMENT SIMILAR FOR PROTECTION COUPLER PANEL--2.2.

�� G4AA CARD FOR ALARM.G4AA CARD FOR ALARM.

MAINMAIN--1 PROTECTION CARRIER INTER TRIPPING1 PROTECTION CARRIER INTER TRIPPING

LINE 21L1LINE 21L1

CR

CS

-VECARRIER RECEIVE

IN

NS

D 5

0N

SD

50

OUT

G4AC V9LC 1

G4AC V9LC 2

G4AC V9LC 5

G4AC V9LC 6

CARRIER SEND

ALARMAB

BA

BB

PANEL-1

G4AC V9LC 2

G4AA V9LB 5

G4AA V9LB 6

NS

D 5

0N

SD

50 G4AC V9LC 10

G4AC V9LC 13

THIS IS BACKUP FOR PERMISSIVE/ PROTECTION TRIPTHIS IS BACKUP FOR PERMISSIVE/ PROTECTION TRIP

+VE -VE

PANEL-2

AB

BA

BB

NS

D 5

0N

SD

50

G4AC V9LC 14

G4AC V9LC 9

THIS IS BACKUP FOR PERMISSIVE/ PROTECTION TRIPTHIS IS BACKUP FOR PERMISSIVE/ PROTECTION TRIPAND CONNECTED IN ANOTHER PANELAND CONNECTED IN ANOTHER PANEL

MAINMAIN--2 PROTECTION CARRIER INTER TRIPPING2 PROTECTION CARRIER INTER TRIPPING

LINE 21L2LINE 21L2

CR

CS

-VECARRIER RECEIVE

IN

NS

D 5

0N

SD

50

OUT

G4AC V9LC 1

G4AC V9LC 2

G4AC V9LC 5

G4AC V9LC 6

CARRIER SEND

ALARMAB

BA

BB

PANEL-2

G4AC V9LC 2

G4AA V9LB 5

G4AA V9LB 6

NS

D 5

0N

SD

50 G4AC V9LC 10

G4AC V9LC 13

THIS IS BACKUP FOR PERMISSIVE/ PROTECTION TRIPTHIS IS BACKUP FOR PERMISSIVE/ PROTECTION TRIP

+VE -VE

PANEL-1

AB

BA

BB

NS

D 5

0N

SD

50

G4AC V9LC 14

G4AC V9LC 9

THIS IS BACKUP FOR PERMISSIVE/ PROTECTION TRIPTHIS IS BACKUP FOR PERMISSIVE/ PROTECTION TRIPAND CONNECTED IN ANOTHER PANELAND CONNECTED IN ANOTHER PANEL

DIRECT TRIP SEND CARRIER CHANNELDIRECT TRIP SEND CARRIER CHANNEL--11

T N C

CONTROL PANEL

87 BUSBAR TRIP (ZONE-1)


96 BUSBAR PROT-1 PANEL


ABBABBNSD 50NSD 50

DC +VE FROM PANEL

PANEL-1

T N C

MAIN CB(1-52CB)

T N C

TIE CB(2-52CB)

R Y B

R Y B

TIE CB (2-52 CB)

MAIN CB (1-52 CB)

50 LBB/BFR FOR MAIN CB / RAICA

G4AD V9LC 2

DC –VE FROM PANEL

G4AD V9LC 1

CONDITIONS FOR DIRECT TRIP59L1 / OVER VOLTAGE STAGE-1

59L2 / OVER VOLTAGE STAGE-2

50 LBB/BFR FOR TIE CB / RAICA

87 HZ / TEED-1 PROTECTION

87 LZ / TEED-2 PROTECTION

CONDITIONS FOR DIRECT TRIP

1. TIE CB OPEN CONDITION + MAIN CB REMOTE HAND TRIP GIVEN.

2. MAIN CB OPEN CONDITION + TIE CB REMOTE HAND TRIP GIVEN.

3. TIE CB OPEN CONDITION + 96 BUSBAR-1 OPERATED.

4. MAIN CB OPEN CONDITION + 96 BUSBAR-2 OPERATED (FOR HALF DIA ONLY).

5. MAIN CB 50 LBB/BFR OPERATED.

6. TIE CB 50 LBB/BFR OPERATED.

7. 59L1 OVER VOLTAGE STAGE-1 OPERATED.


9. 87 HZ TEED-1 PROTECTION OPERATED

10. 87 LZ TEED-2 PROTECTION OPERATED.

DIRECT TRIP SEND CARRIER CHANNELDIRECT TRIP SEND CARRIER CHANNEL-- 22

T N C

CONTROL PANEL





ABBABBNSD 50NSD 50

DC +VE FROM PANEL

PANEL-2

T N C

MAIN CB(1-52CB)

T N C

TIE CB(2-52CB)

R Y B

R Y B

TIE CB (2-52 CB)

MAIN CB (1-52 CB)

50 LBB/BFR FOR MAIN CB / RAICA

G4AD V9LC 2

DC –VE FROM PANEL

G4AD V9LC 1

CONDITIONS FOR DIRECT TRIP59L1 / OVER VOLTAGE STAGE-1

59L2 / OVER VOLTAGE STAGE-2

50 LBB/BFR FOR TIE CB / RAICA

87 HZ / TEED-1 PROTECTION

87 LZ / TEED-2 PROTECTION

CONDITIONS FOR DIRECT TRIP




4. MAIN CB OPEN CONDITION + 96 BUSBAR-2 OPERATED (FOR HALF DIA ONLY).





9. 87 HZ TEED-1 PROTECTION OPERATED

10. 87 LZ TEED-2 PROTECTION OPERATED.

DIRECT TRIP RECEIVE CHANNELDIRECT TRIP RECEIVE CHANNEL--1&21&2

ABBABB

NSD 50NSD 50

PANEL-1

DC +VE

TO 86TO 86--A MASTER TRIP RELAY A MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR (HIGH SPEED TRIP RELAY) FOR MAIN CB(152CB)MAIN CB(152CB)

TO 86TO 86--A MASTER TRIP RELAYA MASTER TRIP RELAY

G4AD V9LC 6

G4AD V9LC 5

ABBABB

NSD 50NSD 50

PANEL-2 +VE -VE

TO 86TO 86--A MASTER TRIP RELAYA MASTER TRIP RELAY(HIGH SPEED TRIP RELAY) FOR (HIGH SPEED TRIP RELAY) FOR TIE CB(252CB)TIE CB(252CB)

TO 86TO 86--B MASTER TRIP RELAYB MASTER TRIP RELAY(HIGH SPEED TRIP RELAY) FOR(HIGH SPEED TRIP RELAY) FOR

DIRECT TRIP-1CARRIER RECEIVE RELAY

NSD 50NSD 50

G4AD V9LC 6

G4AD V9LC 5

DC +VE

(HIGH SPEED TRIP RELAY) FOR(HIGH SPEED TRIP RELAY) FORMAIN CB(152CB)MAIN CB(152CB)

TO 86TO 86--B MASTER TRIP RELAY B MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR(HIGH SPEED TRIP RELAY) FORTIE CB(252CB)TIE CB(252CB)

DIRECT TRIP-2CARRIER RECEIVE RELAY

PLCC CARRIER PROTECTION SYSTEMPLCC CARRIER PROTECTION SYSTEM(TELEPROTECTION)(TELEPROTECTION)

C

E


REL 521MAIN-1

PROTECTIONC

E


PLCCPANEL

PLCCPANEL

NSD 50PANEL

NSD 50PANEL

NSD 50NSD 50

ELECTRICAL CONNECTION

ELECTRICAL POWER LINE

C

E

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16


C

E

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16


REL 316MAIN-2

PROTECTION

NSD 50PANEL

NSD 50PANEL


FIBRE OPTIC PROTECTION SYSTEMFIBRE OPTIC PROTECTION SYSTEM(TELEPROTECTION)(TELEPROTECTION)

C

E


REL 521MAIN-1

PROTECTIONC

E


NSD 70PANEL

NSD 70PANEL

NSD 70NSD 70


FOX-UFOX-515

TU

NO

S

GE

CO

D/

SIF

OX FOX-U

FOX-515

TU

NO

S

GE

CO

D/

SIF

OX

C

E

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16


C

E

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16


REL 316MAIN-2

PROTECTION

NSD 70PANEL

NSD 70PANEL


FIBRE OPTIC CARRIER PROTECTION SYSTEMFIBRE OPTIC CARRIER PROTECTION SYSTEM(TELEPROTECTION)(TELEPROTECTION)

DIGITAL RELAY CONNECTION VIA FIBRE OPTICDIGITAL RELAY CONNECTION VIA FIBRE OPTICABB Network Partner AG REL531

REL 521MAIN-1

PROTECTION


FOX-UFOX-515

TU

NO

S

OT

ER

M

FOX-UFOX-515

TU

NO

S

OT

ER

M

C

E

PROTECTIONC

E

C

E

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16


C

E

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16


REL 316MAIN-2

PROTECTION

FIBRE OPTIC CARRIER PROTECTION SYSTEMFIBRE OPTIC CARRIER PROTECTION SYSTEM(TELEPROTECTION)(TELEPROTECTION)

DIGITAL RELAY CONNECTION VIA FIBRE OPTICDIGITAL RELAY CONNECTION VIA FIBRE OPTIC

MAIN-1 LINE

Tx

Rx

Rx

Tx

NMS

OP

TIM

UX

PR

OT

NC

OU

PL

ER

MAIN-1 LINEPROTECTION

21L1 /87L1

Tx

NMSOP

TIM

UX

PR

OT

NC

OU

PL

ER

CO

UP

LE

R

Tx

Rx

Rx

Tx

MAIN-2 LINEPROTECTION

21L2 /87L2

MISCELLENEOUSMISCELLENEOUSRELAYS & PROTECTIONSRELAYS & PROTECTIONS

ADOPTED FOR ADOPTED FOR ADOPTED FOR ADOPTED FOR AUTO TRANSFORMER INAUTO TRANSFORMER IN

ONE AND HALF ONE AND HALF CIRCUIT BREAKERCIRCUIT BREAKERCIRCUIT BREAKERCIRCUIT BREAKER

SCHEME SCHEME (OVER FLUX & REF FUNCTIONS)(OVER FLUX & REF FUNCTIONS)

PREPARED BYGOPALA KRISHNA PALEPU

ADE/MRT(PROTECTION)

OVER EXCITATION/FLUX RELAYOVER EXCITATION/FLUX RELAY{{FOR AUTO TRANSFORMER HV & LV}FOR AUTO TRANSFORMER HV & LV}

VOLTAGE

SELECTION

BUS-1 PT /

BUS-2 PT

99 T HV

CVT SELECTION

BUS-2 PT

CORE-1

VA : 100

CLASS: 3P

HV OVER FLUX RELAY IS IN BUILT FUNCTION OF MAIN1: 87T1: DIFF PROTN

LV OVER FLUX RELAY IS IN BUILT FUNCTION OF MAIN2: 87T2: DIFF PROTN

99 T LV

CVT SELECTION

BUS-1 CVT /

BUS-2 CVT /

LINE CVT

CORE-1

VA : 100

CLASS: 3P

315MVA, 400KV/220KV AT/F VOLAGE SELECTION315MVA, 400KV/220KV AT/F VOLAGE SELECTION

1-52CBBUS-1 BUS-2

LINE1AT/F-1

2-52CB 3-52CB

FEEDER HAVING LINE CVTs &BUSES ARE HAVING BUS CVTs BUT AT/Fs ARE FEEDER HAVING LINE CVTs &BUSES ARE HAVING BUS CVTs BUT AT/Fs ARE

NOT HAVING CVTs. FOR TRANSFORMER PANEL, PT SUPPLY IS SELECTED AS NOT HAVING CVTs. FOR TRANSFORMER PANEL, PT SUPPLY IS SELECTED AS

PER SELECTION DESCRIBED BELOW FOR METERING AND PROTECTION, PER SELECTION DESCRIBED BELOW FOR METERING AND PROTECTION,

WHICH IS FIRST SELECTED .WHICH IS FIRST SELECTED .

BUSBUS--11

CVTCVT

If AT/F is feeding from BusIf AT/F is feeding from Bus--1 and 11 and 1--52CB & 252CB & 2--52CB is closed. Then 52CB is closed. Then

BusBus--1 CVT is selected and this supply is extended to Control & 1 CVT is selected and this supply is extended to Control &

Relay Panels for Auto Transformer.Relay Panels for Auto Transformer.

BUSBUS--22

CVTCVT

If AT/F is feeding from BusIf AT/F is feeding from Bus--2 and 32 and 3--52 CB is closed & 252 CB is closed & 2--52CB is 52CB is

open. Then Busopen. Then Bus--2 CVT is selected and this supply is extended to 2 CVT is selected and this supply is extended to

Control & Relay Panels for Auto Transformer.Control & Relay Panels for Auto Transformer.

LINELINE

CVTCVT

If AT/F is feeding from Direct Line and 2If AT/F is feeding from Direct Line and 2--52CB is closed & 152CB is closed & 1--52 CB 52 CB

& 3& 3--52 CB is open and 389T ISO is Closed . Then line CVT is 52 CB is open and 389T ISO is Closed . Then line CVT is

selected and this supply is extended to Control & Relay Panels for selected and this supply is extended to Control & Relay Panels for

Auto Transformer.Auto Transformer.

11--PH UNITS OF 500 MVA TRANSFORMER ( EACH PH UNITS OF 500 MVA TRANSFORMER ( EACH 167 MVA ) WITH CHANGE OVER FACILITY167 MVA ) WITH CHANGE OVER FACILITY

RR YY BB RR YY BB

SP

AR

E

1 2 3 4 5 6 7

SP

AR

ES

PA

RE

SP

AR

E

RR YY BB RR YY BB

MAINMAIN--1 & MAIN1 & MAIN--22PROTECTION FORPROTECTION FORSHUNT REACTOR SHUNT REACTOR

ADOPTED IN ADOPTED IN ONE AND HALFONE AND HALF

CIRCUIT BREAKER CIRCUIT BREAKER SCHEMESCHEME


ADE/MRT(PROTECTION)

BASICS OF SHUNT REACTORBASICS OF SHUNT REACTOR1. 1. TYPES OF REACTORS :TYPES OF REACTORS :

A. BASED ON REACTOR CONNECTIONA. BASED ON REACTOR CONNECTIONi. SHUNT REACTOR. ii. SERIES REACTOR.B. BASED ON REACTOR LOCATIONB. BASED ON REACTOR LOCATIONi. BUS REACTOR ii. LINE REACTORC. BASED ON CONTROLC. BASED ON CONTROLi. 3-PH OIL IMMERSED REACTOR WITH GAPPED IRON CORE. i. 3-PH OIL IMMERSED REACTOR WITH GAPPED IRON CORE. ii. THYRISTOR CONTROLLED REACTOR (STATIC VAR COMPENSATOR)

(APTRANSCO UTILISING SHUNT REACTORS FOR BUS & LINE IN 400KV NETWORK)(APTRANSCO UTILISING SHUNT REACTORS FOR BUS & LINE IN 400KV NETWORK)

2. 2. NEED OF SHUNT REACTOR:NEED OF SHUNT REACTOR:

A. LINE REACTORA. LINE REACTORSHUNT REACTORS ARE USED IN ORDER TO COMPENSATE FOR THE CAPACITIVE SHUNT REACTANCEOF TRANSMISSION LINES. THE REACTOR IS CONNECTED PARALLEL TO THE LINE. THE LOCATION OFREACTOR IS OUT GOING SIDE OF LINE i.e AFTER CIRCUIT BREAKER. LENGTH OF LINE IS MORETHERE MAY BE VOLTAGE IS RAISING DUE TO FARANTI EFFECT(CAPACITANCE) DURING CHARGING.IN CASE OF ZONE-2 (OPEN JUMPER) FAULT, THE FAULT CLEARED BY REMOTE END IS FAST, BUTTHIS END IT WILL TAKE TIME DELAY DUE TO ZONE-2. DURING THIS TIME, VOLTAGE MAY RAISING. SO,THIS END IT WILL TAKE TIME DELAY DUE TO ZONE-2. DURING THIS TIME, VOLTAGE MAY RAISING. SO,LINE REACTOR IS USED FOR CONTROLLING THE SWITCHING OVER VOLTAGES AND SAFEGUARDTHE OPERATING EQUIPMENT. NORMALLY IT IS ALWAYS IN SERVICE. NORMALLY BOTH ENDS LINEREACTORS ARE PROVIDED. THE ELECTRICAL INTERLOCK IS PROVIDED THAT IF REACTORISOLATOR CLOSSED POSITION ONLY WILL GIVE PERMIT TO CLOSE THE LINE ISOLATOR. SIMILARLYFOR OPENING REACTOR ISOLATOR THE LINE ISOLATOR SHOULD BE IN OPEN POSITION. NEUTRALREACTOR CONNECTED BETWEEN THE STAR POINT OF EHV SHUNT REACTOR AND THE GROUND,LIMITS THE SECONDARY ARC CURRENT TO A LOW VALUE OF AROUND 10 AMPS TYPICALLY FOR400KV SYSTEM TO ENSURE COMPLETE DE-IONISATION OF ARC PATH WHEN EHV SYSTEM DEVELOPSA SINGLE LINE TO GROUND FAULT. ARC EXTINCTION DURING LINE SINGLE- PHASE AUTORECLOSEDEAD TIME IS ASSISTED BY THIS NEUTRAL REACTOR.

B. BUS REACTORB. BUS REACTORTHE REACTOR IS CONNECTED PARALLEL TO THE BUS i.e LIKE A FEEDER/LINE.DURING LIGHTLY LOADED CONDITIONS THERE MAY BE POSSIBULITY OF RAISINGBUS VOLTAGES. FOR SAFEGUARD THE OPERATING EQUIPMENT BUS REACTORSARE UTILISING. NORMALLY IT IS NOT IN SERVICE. WHENEVER THE VOLTAGERAISES TO 4%TO 5% MORE THAN THE RATED VOLTAGE THIS MAY BE KEPT INSERVICE AND 2% TO 3% LESS THAN THE RATED VOLTAGE THIS MAY BE KEPT OUTOF SERVICE.

3.3. SELECTION OF REACTORSELECTION OF REACTORA. LINE REACTORA. LINE REACTORA. LINE REACTORA. LINE REACTORNORMALLY LINE REACTORS ARE PROVIDED IF THE LINE IS MORE OR EQUAL TO250KM. IN APTRANSCO NETWORK MAXIMUM LENTH OF LINE IS 350KM. AS PERSYSTEM STUDIES RECOMANDATIONS IF LINE LENGTH IS 250KM TO 300KM 50MVARREACTOR IS TO BE USED. IF MORE THAN 300KM 63MVAR REACTOR IS TO BE USED.B. BUS REACTOR B. BUS REACTOR NORMALLY BUS REACTORS ARE PROVIDED IF THE SUBSTATION BUS VOLTAGE ISRAISING 5% MORE THAN THE RATED VOLTAGE DURING LIGHTLY LOADEDCONDITION. BASED ON THE SYSTEM STUDIES RECOMANDATIONS BUS REACTORSARE TO BE PROVIDED. CALCULATIONS ARE REQUIRED FOR PROVIDING BUSARE TO BE PROVIDED. CALCULATIONS ARE REQUIRED FOR PROVIDING BUSREACTOR. IN THIS THERE IS NO STANDARDISATION.

4.4. LOCATION OF REACTORS WITH CAPACITY IN APTRANSCOLOCATION OF REACTORS WITH CAPACITY IN APTRANSCOA. LINE REACTORA. LINE REACTOR1. 400KV KALAPAKA-KHAMMAM 1 AT BOTH ENDS – 63MVAR 2. 400KV KALAPAKA-KHAMMAM 2 AT BOTH ENDS – 63MVARB. BUS REACTORB. BUS REACTOR1. 400KV KALAPAKA SS – 2 X 50 MVAR2. 400KV NUNNA SS(PGCIL BAYS) – 1 x 63 MVAR

5. 5. PURPOSE OF SHUNT REACTOR PROTECTIONPURPOSE OF SHUNT REACTOR PROTECTIONTHE PURPOSE OF THE PROTECTION RELAYING IS TO DISCONNECT THE REACTOR AND LIMIT DAMAGE IN CASE OF INTERNAL SHORT CIRCUITS, EARTH FAULTS, INTERTURN FAULTS AND OVER VOLTAGE OR OVER LOAD.THE REACTOR FORMS CERTAIN IMPEDENCE FOR RATED FREQUENCY, AND AS IT IS SHUNT CONNECTED, AS OVER LOAD MAY BE CAUSED BY OVER VOLTAGE OR HARMONICS IN VOLTAGE AND CURRENT.

6. 6. PROTECTION DEVICES INBUILT OR MOUNTED ON REACTORPROTECTION DEVICES INBUILT OR MOUNTED ON REACTORA.A. OIL IMMERSED REACTOR USUALLY HAVE A GAS DETECTOR AND OIL SURGE. DETECTOR (BUCHHOLZ ALARAM & TRIP DEVICES), WHICH ARE EXCELLENT FOR DETECTING INTERNAL FAULTS.DETECTING INTERNAL FAULTS.B.B. TEMPARATURE MONITORS FOR OIL & WINDING PROVIDE GOOD OVER LOAD PROTECTION.C.C. PRESSURE RELIEF DEVICE IS PROVIDED TO SAFE GUARD THE REACTOR FROM HIGH PRESURES.

7.7. REACTOR DIFFERENTIAL PROTECTIONREACTOR DIFFERENTIAL PROTECTIONIT IS WIDELY USED AS INSTANTANEOUS PROTECTION FOR SHORT CIRCUIT FAULTS WITH IN THE DIFFERENTIAL ZONE. THIS IS TREATED AS MAIN-1 PROT FOR REACTOR.IT CAN BE OF HIGH IMPEDENCE TYPE OR OF A SENSITIVE CURRENT STABILISED TYPE. HIGH IMPEDENCE DIFFERENTIAL PROTECTION RELAYS REQUIRE AN EQUAL CT TURNS RATIO ON THE PHASE AND NEUTRAL SIDE. SENSITIVITY IS 5% OF NOMINAL REACTOR CT RATIO ON THE PHASE AND NEUTRAL SIDE. SENSITIVITY IS 5% OF NOMINAL REACTOR CT CURRENT.

8.8. BACKBACK--UP PROTECTIONUP PROTECTIONA VARIETY OF RELAYS ARE AVAILABLE.A.A. OVER CURRENT & EARTH FAULT PROTECTION. ( 50, 50N, 51, 51N, 67, 67N - ANY COMBINATION OF THESE)B.B. UNDER IMPEDENCE / DISTANCE ( Z<)(21R).C.C. NEUTRAL DISPLACEMENT PROTECTION (Un>).

9.9. RESTRICTED EARTH FAULT PROTECTIONRESTRICTED EARTH FAULT PROTECTIONIF, FOR SOME REASON, A SENSITIVE DIFFERENTIAL PROTECTION NOT CHOOSEN A RESTRICTED EARTH FAULT PROTECTION CAN BE UTILISED.

SHUNT REACTOR (BUS & LINE) SHUNT REACTOR (BUS & LINE) ((ONE AND HALF CIRCUIT BREAKER SYSTEM )ONE AND HALF CIRCUIT BREAKER SYSTEM )

1-89 3-89

BUS-1 BUS-2

IL

INTER LOCK FACILITY:WHEN 1-89R CLOSES ONLY

1-89A

11--52CB52CB

1-CT

3-89A

33--52CB52CB

3-CT

2-CT

P1

P1

P1

P2 P2

P21-89R .

WHEN 1-89R CLOSES ONLY PERMIT TO CLOSE 1-89L AND

1-89L OPENS ONLY PERMIT TO OPEN 1-89R.

LINE 1

22--52CB52CB2-89A 2-89B

1-89LUU UUUU UU

UU UU

LINESHUNT

REACTOR

UU UUUU UU

UU UU

BUSSHUNT

REACTOR

.3-89R

UU UUUU UUUU UUUU UU

IL

1-PH NEUTRAL GROUNDING REACTOR

REACTOR BUSHING CT INFORMATIONREACTOR BUSHING CT INFORMATION

CAPACITY OF 400KV REACTORS : 50, 63, 80, 125 MVAR

Sr Sr Sr Sr

NONONONOITEM

SHUNT REACTOR NGR

400KV / LINE SIDE STAR / NEUTRAL SIDE LINE SIDEEARTH SIDE

CORE-1 CORE -2 CORE-3 CORE-4 CORE-5 CORE-1 CORE-2 CORE -3 CORE-4 CORE-1 CORE-2

2000- 2000-

1111 RATIO 200/1 200/1 200/1

2000-

1000-

500/1

2000-

1000-

500/1

200/1 WTI 200/1 200/1 200/1 200/1

NEUTRAN BUSHING CT : BEFORE STAR FORMATION IN RYB PHASES

2222

VKNEE FOR PS & VA FOR

MET200V 200V 200V

1000-500-250V

1000-500-250V 1.0 CL

AND BURDEN

Parameters of W

TI CT for each winding shall be

provided by the contractor

200V 200V 200V 200V

10 – 5 – 10 – 5 BURDEN 10 VA

Parameters of W

TI CT for each winding shall be

provided by the contractor

3333 RCT IN OHMS 1 OHM 1 OHM 1 OHM10 – 5 –

2.5 OHM

10 – 5 – 2.5 OHM

1 OHM 1 OHM 1 OHM 1 OHM

4444CLASS OF ACURACY

PS PS PS PS PS PS PS PS PS

5555 PURPOSE87 R1DIFF1

87 R2 DIFF2

21 R IMP

FOR 21L2 /TEED-2

FOR 21L1 /TEED-1

MET87 R1DIFF1

87 R2DIFF2

64 RREF2

64 RREF1/2

SHUNT REACTOR PROTECTIONSHUNT REACTOR PROTECTION

CORES

ONE & HALF BREAKER

SYSTEM

DOUBLE BUS & TRANSFER

BUS SYSTEM

LINE BUS LINE BUS

400KV SIDE

87R1 – 3Ph, 2Wdg REACTOR DIFFERENTIAL RELAY OF LOW CORE-1

87R1 – 3Ph, 2Wdg REACTOR DIFFERENTIAL RELAY OF LOW IMPEDANCE TYPE.

CORE-287R2 - 3Ph, 3Wdg REACTOR DIFFERENTIAL RELAY OF HIGH

IMPEDANCE TYPE.

CORE-3

21R – 3Ph, REACTOR BACKUP IMPEDANCE RELAY OF SUITABLY SHAPED CHARECRESTICS EITHER SINGLE /

DOUBLE ZONE TYPE.

21L2 87 TEED-2 21L2CORE-4

21L2

(M_CT + T_CT – R_CT)

87 TEED-2

(M_CT, T_CT, R_CT)

21L2

(M_CT+T_CT – R_CT)87 BBC/BB-2

CORE-521L1

(M_CT + T_CT – R_CT)

87 TEED-1

(M_CT, T_CT, R_CT)

21L1

(M_CT + T_CT – R_CT)87 BBM/BB-1

M_CT: Main CT, T_CT: Tie CT, R_CT: Reactor CT

SHUNT REACTOR PROTECTIONSHUNT REACTOR PROTECTION

CORES

ONE & HALF BREAKER

SYSTEM

DOUBLE BUS & TRANSFER

BUS SYSTEM

LINE BUS LINE BUS

STAR / NEUTRAL SIDE

CORE-1 METERING OF REACTOR

CORE-2 WINDING TEMPARETURE OF REACTOR

CORE-387R2 - 3Ph, 3Wdg REACTOR DIFFERENTIAL RELAY OF HIGH

IMPEDANCE TYPE.

CORE-487R1 – 3Ph, 2Wdg REACTOR DIFFERENTIAL RELAY OF LOW

IMPEDANCE TYPE.

NEUTRAL GROUNDING REACTOR SIDENEUTRAL GROUNDING REACTOR SIDE

CORE-1 64 REF1 - - 64 REF2 - -

CORE-2 64 REF1 - - 64 REF 1 / 2 - -


LINESHUNT

REACTOR

1-PH NEUTRAL GROUNDING REACTOR

CO

RE

-1

CO

RE

-2

CO

RE

-3

CO

RE

-4

CO

RE

-5

CO

RE

-1

CO

RE

-2

CO

RE

-3

CO

RE

-4

CO

RE

-1

CO

RE

-2

UUUUUUUUUUUUUUUUUUUU

UUUUUUUUUUUUUUUUUUUU UUUUUUUUUUUU

.



UUUUUUUUUUUU


BUSSHUNT

REACTOR

CO

RE

-1

CO

RE

-2

CO

RE

-3

CO

RE

-4

CO

RE

-5

CO

RE

-1

CO

RE

-2

CO

RE

-3

CO

RE

-4

UUUUUUUU UUUUUUUUUUUU


.



ONE & HALF BREAKER LINE & BUS SHUNT REACTOR PROTECTION SCHEMEONE & HALF BREAKER LINE & BUS SHUNT REACTOR PROTECTION SCHEME

87BB1

CVT

VBB1

79

25

BFVL1 / VL2

OR VBB2

VBB1

87L 21M2 CVT VL1VL1

BUSBARBUSBAR--11

21M1 VL1

79

25

FEEDER1 / LINE1

BF

VL1 / VBB1

VL2 / VBB2

UUUUUUUU UUUU UUUUUUUU UUUU

87R

64R

OR

21R

UUUUUUUU UUUU

87R

VL1/

VBB1

/VBB

2

87BB2

CVT

VBB279

25VBB2

BF

VL2 / VL1

OR VBB1

BUSBARBUSBAR--22

TEED-2

PROTECTION OF BUS REACTOR

FOR REACTOR PROTECTION & METERING VOLTAGE SELECTION RELAYS FOR BUS-1, BUS-2& LINE ARE PROVIDED .

UUUUUUUU UUUU

64R

VBB1

/VBB

2

21R

TEED-1

LINE/BUS REACTOR DIFFERENTIAL PROTECTION LINE/BUS REACTOR DIFFERENTIAL PROTECTION (LOW IMPEDANCE DIFFERENTIAL PROTECTION)(87R1)(LOW IMPEDANCE DIFFERENTIAL PROTECTION)(87R1)

R-CT

P2P2P2 CT MB

3 3 33S1 3S1 3S1

3S23S2 3S2

CT MB

RET 670RET 670

3 3 3

R-CT

HV BUSHING

CORE-1

CTR: 200/1A

CLASS: PS

1S2 1S2 1S2

1S11S1 1S1

R-CT

STAR BUSHING

CORE-4

CTR: 200/1A

CLASS: PS

P2P2P2

C

DISPLAY

ACTIVE START TRIP

NORMALLYC

E

NORMALLYLOW IMPEDENCE (87R1) DIFFERENTIAL RELAY IS

USED FOR BUS / LINE REACTOR

DIFFERENTIAL PROTECTION

IN CASE OF REACTOR BUSHING CT P2 IS AWAY FROM REACTOR & P1 IS TOWARDS REACTOR

ACTIVE START TRIP

RET 670RET 6703 3 3

R-CT HV

BUSHING CT

CORE-2

CTR: 200/1A

P2P2P2

1S21S21S2

1S11S11S1

LINE/BUS REACTOR DIFFERENTIAL PROTECTION LINE/BUS REACTOR DIFFERENTIAL PROTECTION (HIGH IMPEDANCE DIFFERENTIAL PROTECTION) (87R2)(HIGH IMPEDANCE DIFFERENTIAL PROTECTION) (87R2)

C

E

DISPLAYCLASS: PS

P1P1P1

NORMALLY

3 3 3

R-CT STAR

BUSHING CT

CORE-3

CTR: 200/1A

CLASS: PS

P2P2P2

P1P1P1

3S23S23S2

3S13S13S1

IN CASE OF REACTOR BUSHING CT P2 IS AWAY FROM REACTOR

& P1 IS TOWARDS REACTOR

NORMALLYHIGH IMPEDENCE (87R2) DIFFERENTIAL RELAY IS

USED FOR BUS / LINE REACTOR

DIFFERENTIAL PROTECTION

ACTIVE START TRIP

RET 670RET 6703 3 3

P2P2P2

2S22S22S2

2S12S12S1

LINE/BUS REACTOR REF PROTECTION LINE/BUS REACTOR REF PROTECTION (NGR IS NOT AVAIALBLE)(NGR IS NOT AVAIALBLE)

R-CT HV

BUSHING CT

CORE-2

CTR: 200/1A

NORMALLYHIGH IMPEDENCE

VOLTAGE/CURRENT OPERATED SINGLE

C

E

DISPLAYP1P1P1

CLASS: PS OPERATED SINGLE POLE RELAY IS USED

FOR BUS / LINE REACTOR RESTRICTED

EARTH FAULT PROTECTION.

PRESENTLY NUMERICAL DIFFERENTIAL RELAYS

HAVING IN BUILT FUNCTION OF 2 REF OR

3 3 3

P2P2P2

P1P1P1

4S24S24S2

4S14S14S1

R-CT STAR

BUSHING CT

CORE-3

CTR: 200/1A

CLASS: PS



FUNCTION OF 2 REF OR 2 SEF PROTECTIONS.

3 3 3

P2P2P2

2S22S22S2

2S12S12S1

LINE REACTOR REF PROTECTION LINE REACTOR REF PROTECTION (NGR IS AVAIALBLE)(NGR IS AVAIALBLE)

R-CT HV

BUSHING CT

CORE-2

CTR: 200/1A

ACTIVE START TRIP

RET 670RET 670NORMALLY

HIGH IMPEDENCEVOLTAGE/CURRENT OPERATED SINGLE

P1P1P1

CLASS: PS

C

E

DISPLAYOPERATED SINGLE

POLE RELAY IS USED FOR BUS / LINE

REACTOR RESTRICTED EARTH FAULT PROTECTION.

PRESENTLY NUMERICAL DIFFERENTIAL RELAYS

HAVING IN BUILT FUNCTION OF 2 REF OR

NGR-CT EARTH

BUSHING CT

CORE-2

CTR: 200/1A

CLASS: PS



FUNCTION OF 2 REF OR 2 SEF PROTECTIONS.

3

P1

S1

S2

P2

3 3 3

P2P2P2

2S22S22S2

2S12S12S1

LINE REACTOR 2 NOs REF PROTECTIONS LINE REACTOR 2 NOs REF PROTECTIONS (NGR IS AVAIALBLE)(NGR IS AVAIALBLE)

R-CT HV

BUSHING CT

CORE-2

CTR: 200/1A

ACTIVE START TRIP

RET 670RET 670

31S1

1S2

P2

P1P1P1

CLASS: PS

C

E

DISPLAY

NORMALLY

HIGH IMPEDENCE

NGR-CT BUSHING CT

CORE - 1 & 2CTR: 200/1A

CLASS: PS

P1

3 3 3

P2P2P2

P1P1P1

4S24S24S2

4S14S14S1

R-CT STAR

BUSHING CT

CORE-4

CTR: 200/1A

CLASS: PS

HIGH IMPEDENCE

VOLTAGE/CURRENT OPERATED

SINGLE POLE RELAY IS USED

FOR BUS / LINE REACTOR

RESTRICTED EARTH FAULT

PROTECTION.

PRESENTLY NUMERICAL

DIFFERENTIAL RELAYS HAVING

IN BUILT FUNCTION OF 2 REF OR

2 SEF PROTECTIONS.

3

P2

2S2

2S1

P1

REL 670REL 670

IR3 / A311

IY3 / A331

IB3 / A351

P2P2P2 CT MB

VR11 / E111

VY11 / E131

VB11 / E151

LINE/BUS REACTOR B/U IMPEDANCE PROTECTIONLINE/BUS REACTOR B/U IMPEDANCE PROTECTION

R-CT HV

BUSHING CT

C

E

DISPLAY

ACTIVE START TRIP

REL 670REL 6703 3 3

IB3 / A351

IN3 / A371

3S2 3S2 3S2

3S13S1 3S1

VB11 / E151

VN11 / E171BUSHING CT

CORE-3

CTR: 200/1A

CLASS: PS CVT

SELECTION

BUS-1 CVT /

BUS-2 CVT /

LINE CVT

CORE-2

VA : 100

CLASS: 3PE CLASS: 3P

LINE REACTOR PROTECTION FOR LINELINE REACTOR PROTECTION FOR LINE(MAIN(MAIN--1 PROTECTION)1 PROTECTION)

ACTIVE START TRIP

REL 521REL 5213 3 3

IR5 / A511

IY5 / A531

IB5 / A551

IN5 / A571

1-CT

CORE-5

CTR: 2000-1000-500/1A

CLASS: PS

5S4 5S4 5S4

5S25S2 5S2

P2P2P2 CT MB

VR11 / E111

VY11 / E131

VB11 / E151

VN11 / E171

1-CVT

CORE – 1

C

E

DISPLAY

3 3 32-CT

CORE-5

CTR: 2000-1000-500/1A

CLASS: PS

5S4 5S4 5S4

5S25S2 5S2

CORE – 1

100VA

CLASS: 3P

P2P2P2

3 3 3

LR-CT 400KV

CORE-5

CTR: 2000-1000-500/1A

CLASS: PS

P1P1P1

5S2 5S2 5S2

5S45S4 5S4

LINE REACTOR PROTECTION FOR LINELINE REACTOR PROTECTION FOR LINE(MAIN(MAIN--2 PROTECTION)2 PROTECTION)

ACTIVE START TRIP

REL 316REL 3163 3 3

IR4 / A411

IY4 / A431

IB4 / A451

IN4 / A471

1-CT

CORE-4

CTR: 2000-1000-500/1A

CLASS: PS

4S4 4S4 4S4

4S24S2 4S2

P2P2P2 CT MB

VR21 / E211

VY21 / E231

VB21 / E251

VN21 / E271

1-CVT

CORE – 2

C

E

DISPLAY

3 3 32-CT

CORE-4

CTR: 2000-1000-500/1A

CLASS: PS

4S4 4S4 4S4

4S24S2 4S2

CORE – 2

100VA

CLASS: 3P

P2P2P2

3 3 3

LR-CT 400KV

CORE-4

CTR: 2000-1000-500/1A

CLASS: PS

P1P1P1

4S2 4S2 4S2

4S44S4 4S4

BUS REACTOR TEEDBUS REACTOR TEED--1 PROTECTION1 PROTECTION{BAY3&2}{BAY3&2}

3 3 3

3-CT

CORE-5

CTR: 2000-1000-500/1A

CLASS: PS

P2P2P2

5S4 5S4 5S4

5S25S2 5S2

IR5IY5IB5

IN5

C

DISPLAY

ACTIVE START TRIP

RET 670RET 670

3 3 32-CT

CORE-1

CTR: 2000-1000-500/1A

CLASS: PS

P1P1P1

P2P2P2

P1P1P1

1S4 1S4 1S4

1S21S2 1S2

IN5

IR5IY5IB5

IN5

E

3 3 3

BR-RCT

CORE-5

CTR: 2000-1000-500/1A

CLASS: PS

P1P1P1

P1P1P1

P2P2P2

5S4 5S4 5S4

5S25S2 5S2 IT WORKS ON CIRCULATING CURRENT PRINCIPLE AND IT IS

HIGH IMPEDENCE DIFFERENTIAL RELAY. TEED-1 PROTECTION

FOR BAY 2&3 AND THE FOLLOWING CTs & CORES ARE USED 3-

CT(CORE-5), 2-CT(CORE-1) & BR-CT (CORE-5) ARE STARRED

AND CONNECTED TO TEED-1 PROTECTIONIR5IY5IB5

IN5

BUS REACTOR TEEDBUS REACTOR TEED--2 PROTECTION2 PROTECTION{BAY3&2}{BAY3&2}

3 3 3

3-CT

CORE-4

CTR: 2000-1000-500/1A

CLASS: PS

4S4 4S4 4S4

4S24S2 4S2

P2P2P2 CT MB

3 3 32S2 2S2 2S2

2S42S4 2S4

P2P2P2CT MB

RET 670RET 670CLASS: PS

BR-CT

CT MBP2P2P2

2-CT

CORE-2

CTR: 2000-1000-500/1A

CLASS: PS

C

DISPLAY

ACTIVE START TRIP

IT WORKS ON KIRCHOFF’S

3 3 3CORE-4

CTR: 2000-1000-500/1A

CLASS: PS4S2 4S2 4S2

4S44S4 4S4

C

E

IT WORKS ON KIRCHOFF’S CURRENT PRINCIPLE & IT IS PERCENTAGE BIASED LOW IMPEDENCE DIFFERENTIAL RELAY. TEED-2 PROTECTION FOR BAY 2&3 IS THE FOLLOWING CTs & CORES ARE USED. 3-CT(CORE-4), 2-CT(CORE-2) & BR-CT (CORE-4) ARE CONNECTED TO TEED-2 PROTECTION.

3 3 3

IR2 / D211

IY2 / D231

IB2 / D251R-CT STAR

BUSHING CT

CORE-2

2S2 2S2 2S2

2S12S1 2S1

P2P2P2 CT MB

REACTOR BAY CONTROL UNIT (BCU)REACTOR BAY CONTROL UNIT (BCU)

3 3 3

IN2 / D271

CORE-2

CTR: 200/1A

CLASS: 0.2

2S12S1 2S1

VR31 / E311

VY31 / E331VY31 / E331

VB31 / E351

VN31 / E371

BASED ON SELECTION

LINE CVT / BUS-1 CVT / BUS-2 CVT

CORE – 3

100VA

CLASS: 0.2

CARRIER INTERTRIPPING OF LINE SHUNT REACTORCARRIER INTERTRIPPING OF LINE SHUNT REACTORLINE SHUNT REACTOR PROTECTION TRIPPINGS WILL BE USED AS DIRECT TRIPPINGS OF LINE IN LINE SHUNT REACTOR PROTECTION TRIPPINGS WILL BE USED AS DIRECT TRIPPINGS OF LINE IN ADDITION TO OTHER TRIPPINGS. BUS SHUNT REACTOR NEED NOT REQUIRE CARRIER INTER ADDITION TO OTHER TRIPPINGS. BUS SHUNT REACTOR NEED NOT REQUIRE CARRIER INTER TRIPPING FACILITY.TRIPPING FACILITY.

87R1 REACTOR DIFFERENTIAL RELAY

21R REACTOR IMPEDENCE RELAY

ABBABB

NSD 50NSD 50DC +VE

FROM PANEL

LINE PROTECTION COUPLER PANEL-1RET 670

REL 670

87R2/64R RESTRICTED EARTH FAULT RELAY

FROM PANEL

G4AD V9LC 2

DC –VE FROM PANELG4AD V9LC 1

ABBABB

NSD 50NSD 50

LINE PROTECTION COUPLER PANEL-2

REL 670

RET 670

REACTORS INTERNAL FAULTS

87R1 REACTOR DIFFERENTIAL RELAY

GROUP-1/A TRIPPINGS

RET 670

NSD 50NSD 50

DC +VE FROM PANEL

G4AD V9LC 2

DC –VE FROM PANELG4AD V9LC 1

COUPLER PANEL-2

21R REACTOR IMPEDENCE RELAY

87R2/64R RESTRICTED EARTH FAULT RELAY

REACTORS INTERNAL FAULTS

GROUP-2/B TRIPPINGS

REL 670

RET 670

ADDITIONAL AND ADDITIONAL AND SPECIAL FUNCTIONS SPECIAL FUNCTIONS

ADOPTED INADOPTED INADOPTED INADOPTED INONE AND HALF ONE AND HALF

CIRCUIT BREAKERCIRCUIT BREAKERSCHEME SCHEME SCHEME SCHEME

(EVENT LOGGER & DISTURBANCE (EVENT LOGGER & DISTURBANCE RECORDER)RECORDER)


ADE/MRT(PROTECTION)

400KV SUBSTATION: MAMIDIPALLY 400KV SUBSTATION: MAMIDIPALLY EVENT LOGGER EVENTS INFORMATIONEVENT LOGGER EVENTS INFORMATION

19 MAR 2004 13:00:0019 MAR 2004 13:00:00A 13:09:37.090 # 195 400KV SRISAILAMA 13:09:37.090 # 195 400KV SRISAILAM--2 MAIN2 MAIN--2 RAZFE PROT TRIP 2 RAZFE PROT TRIP A 13:09:37.096 # 188 400KV SRISAILAMA 13:09:37.096 # 188 400KV SRISAILAM--2 MAIN2 MAIN--1 REL100 PROT START’Y’ 1 REL100 PROT START’Y’

A 13:09:37.097 # 187 400KV SRISAILAMA 13:09:37.097 # 187 400KV SRISAILAM--2 MAIN2 MAIN--1 REL100 PROT START’R’1 REL100 PROT START’R’A 13:09:37.100 # 181 400KV SRISAILAMA 13:09:37.100 # 181 400KV SRISAILAM--2 MAIN2 MAIN--1 REL100 PROT TRIP1 REL100 PROT TRIPA 13:09:37.104 # 162 400KV SRISAILAMA 13:09:37.104 # 162 400KV SRISAILAM--2 MAIN CB 752 Y2 MAIN CB 752 Y--PH OPENPH OPENA 13:09:37.110 # 196 400KV SRISAILAMA 13:09:37.110 # 196 400KV SRISAILAM--2 MAIN2 MAIN--2 RAZFE CARRIER SEND2 RAZFE CARRIER SEND

A 13:09:37.110 # 170 400KV SRISAILAMA 13:09:37.110 # 170 400KV SRISAILAM--2 AT/F2 AT/F--2 TIE CB 852 B2 TIE CB 852 B--PH OPENPH OPENA 13:09:37.111 # 161 400KV SRISAILAMA 13:09:37.111 # 161 400KV SRISAILAM--2 MAIN CB 752 R2 MAIN CB 752 R--PH OPENPH OPENA 13:09:37.111 # 161 400KV SRISAILAMA 13:09:37.111 # 161 400KV SRISAILAM--2 MAIN CB 752 R2 MAIN CB 752 R--PH OPENPH OPENA 13:09:37.111 # 163 400KV SRISAILAMA 13:09:37.111 # 163 400KV SRISAILAM--2 MAIN CB 752 B2 MAIN CB 752 B--PH OPENPH OPENA 13:09:37.111 # 169 400KV SRISAILAMA 13:09:37.111 # 169 400KV SRISAILAM--2 AT/F2 AT/F--2 TIE CB 852 Y2 TIE CB 852 Y--PH OPENPH OPENA 13:09:37.112 # 168 400KV SRISAILAMA 13:09:37.112 # 168 400KV SRISAILAM--2 AT/F2 AT/F--2 TIE CB 852 R2 TIE CB 852 R--PH OPENPH OPEN

A 13:09:37.113 # 182 400KV SRISAILAMA 13:09:37.113 # 182 400KV SRISAILAM--2 MAIN2 MAIN--1 REL100 CARRIER SEND1 REL100 CARRIER SENDA 13:09:37.126 # 199 400KV SRISAILAMA 13:09:37.126 # 199 400KV SRISAILAM--2 CARRIER PROT CH2 CARRIER PROT CH--2 RECEIVED2 RECEIVEDA 13:09:37.140 # 185 400KV SRISAILAMA 13:09:37.140 # 185 400KV SRISAILAM--2 CARRIER PROT CH2 CARRIER PROT CH--1 RECEIVED1 RECEIVEDN 13:09:37.147 # 195 400KV SRISAILAMN 13:09:37.147 # 195 400KV SRISAILAM--2 MAIN2 MAIN--2 RAZFE PROT TRIP RESET2 RAZFE PROT TRIP RESET

N 13:09:37.148 # 196 400KV SRISAILAMN 13:09:37.148 # 196 400KV SRISAILAM--2 MAIN2 MAIN--2 RAZFE CARRIER SEND RESET2 RAZFE CARRIER SEND RESETN 13:09:37.175 # 187 400KV SRISAILAMN 13:09:37.175 # 187 400KV SRISAILAM--2 MAIN2 MAIN--1 REL100 START ‘R’ RESET1 REL100 START ‘R’ RESETN 13:09:37.176 # 181 400KV SRISAILAMN 13:09:37.176 # 181 400KV SRISAILAM--2 MAIN2 MAIN--1 REL100 PROT TRIP RESET1 REL100 PROT TRIP RESETN 13:09:37.176 # 188 400KV SRISAILAMN 13:09:37.176 # 188 400KV SRISAILAM--2 MAIN2 MAIN--1 REL100 START ‘Y’ RESET1 REL100 START ‘Y’ RESETN 13:09:37.185 # 182 400KV SRISAILAMN 13:09:37.185 # 182 400KV SRISAILAM--2 MAIN2 MAIN--1 REL100 CARRIER SEND RESET1 REL100 CARRIER SEND RESETN 13:09:37.185 # 182 400KV SRISAILAMN 13:09:37.185 # 182 400KV SRISAILAM--2 MAIN2 MAIN--1 REL100 CARRIER SEND RESET1 REL100 CARRIER SEND RESET

N 13:09:37.257 # 199 400KV SRISAILAMN 13:09:37.257 # 199 400KV SRISAILAM--2 CARRIER PROT CH2 CARRIER PROT CH--2 RECEIVED RESET2 RECEIVED RESETN 13:09:37.279 # 185 400KV SRISAILAMN 13:09:37.279 # 185 400KV SRISAILAM--2 CARRIER PROT CH2 CARRIER PROT CH--1 RECEIVED RESET1 RECEIVED RESET19 MAR 2004 14:00:0019 MAR 2004 14:00:00N 14:09:48.702 # 163 400KV SRISAILAMN 14:09:48.702 # 163 400KV SRISAILAM--2 MAIN CB 752 B2 MAIN CB 752 B--PH CLOSEPH CLOSEN 14:09:48.704 # 161 400KV SRISAILAMN 14:09:48.704 # 161 400KV SRISAILAM--2 MAIN CB 752 R2 MAIN CB 752 R--PH CLOSEPH CLOSE

N 14:09:48.720 # 162 400KV SRISAILAMN 14:09:48.720 # 162 400KV SRISAILAM--2 MAIN CB 752 Y2 MAIN CB 752 Y--PH CLOSEPH CLOSEN 14:10:00.903 # 169 400KV SRISAILAMN 14:10:00.903 # 169 400KV SRISAILAM--2 AT/F2 AT/F--2 TIE CB 852 Y2 TIE CB 852 Y--PH CLOSEPH CLOSEN 14:10:00.907 # 168 400KV SRISAILAMN 14:10:00.907 # 168 400KV SRISAILAM--2 AT/F2 AT/F--2 TIE CB 852 R2 TIE CB 852 R--PH CLOSEPH CLOSEN 14:10:00.907 # 170 400KV SRISAILAMN 14:10:00.907 # 170 400KV SRISAILAM--2 AT/F2 AT/F--2 TIE CB 852 B2 TIE CB 852 B--PH CLOSEPH CLOSE

19 MAR 2004 15:00:0019 MAR 2004 15:00:00

R PH VOLTAGE

Y PH VOLTAGE

B PH VOLTAGE

OPEN DELTA VOLTAGE

DIS

TU

RB

AN

CE

RE

CO

RD

ER

DIS

TU

RB

AN

CE

RE

CO

RD

ER

R PH CURRENT

Y PH CURRENT

B PH CURRENT

STAR/NEUTRAL CURRENT

MAIN CB R PH OPENMAIN CB Y PH OPENMAIN CB B PH OPEN

TIE CB R PH OPEN

DIS

TU

RB

AN

CE

RE

CO

RD

ER

DIS

TU

RB

AN

CE

RE

CO

RD

ER

MAIN CB B PH OPENTIE CB R PH OPENTIE CB Y PH OPENTIE CB B PH OPEN

MAIN/TIE CB LBB OPTDDIRECT TRIP CH-1/2 OPTD

BUSBAR PROT OPTDMAIN-1 PROT OPTDMAIN-2 PROT OPTD

OVER VOLTAGE STAGE-1/2 OPTDSTUB PROT-1/2 OPTD

MAIN-1 PROT CARRIER RECEIVEMAIN-2 PROT CARRIER RECEIVE

DF/DT OPTD

EVENT NONAME OF FEEDER

DATE & TIME

DIS

TU

RB

AN

CE

RE

CO

RD

ER

DIS

TU

RB

AN

CE

RE

CO

RD

ER

PREFERRED DISTURBANCE RECORDER PREFERRED DISTURBANCE RECORDER 400 KV LINES400 KV LINES 400 KV TRANSFORMER400 KV TRANSFORMER

ANALOGANALOG CHANNELSCHANNELS1. R-PH VOLTAGE2. Y-PH VOLTAGE3. B-PH VOLTAGE4. OPEN DELTA VOLTAGE5. R-PH CURRENT6. Y-PH CURRENT7. B-PH CURRENT

ANALOGANALOG CHANNELSCHANNELS1. HV R-PH VOLTAGE2. HV Y-PH VOLTAGE3. HV B-PH VOLTAGE4. HV OPEN DELTA VOLTAGE5. LV R-PH VOLTAGE6. LV Y-PH VOLTAGE7. LV B-PH VOLTAGE

DIGITALDIGITAL CHANNELSCHANNELS1. HV MAIN CB R-PH OPEN2. HV MAIN CB Y-PH OPEN3. HV MAIN CB B-PH OPEN4. HV TIE CB R-PH OPEN5. HV TIE CB Y-PH OPEN6. HV TIE CB B-PH OPEN7. LV 220 CB R-PH OPEN

7. B-PH CURRENT8. NEUTRAL/STAR CURRENT

DIGITALDIGITAL CHANNELSCHANNELS1. HV MAIN CB R-PH OPEN2. HV MAIN CB Y-PH OPEN3. HV MAIN CB B-PH OPEN4. HV TIE CB R-PH OPEN5. HV TIE CB Y-PH OPEN6. HV TIE CB B-PH OPEN7. 21 MAIN1 REL 521 OPERATED8. 21 MAIN2 REL 316 OPERATED9. 87 BUSBAR RELAY OPERATED10. MAIN CB A/R OPERATED11. TIE CB A/R OPERATED

7. LV B-PH VOLTAGE8. LV OPEN DELTA VOLTAGE9. HV R-PH CURRENT10. HV Y-PH CURRENT11. HV B-PH CURRENT12. HV NEUTRAL/STAR CURRENT13. LV R-PH CURRENT14. LV Y-PH CURRENT15. LV B-PH CURRENT16. LV NEUTRAL/STAR CURRENT

7. LV 220 CB R-PH OPEN8. LV 220 CB Y-PH OPEN9. LV 220 CB B-PH OPEN10. 87 T1 DIFF RLY OPERATED11. 87 T2 DIFF RLY OPERATED12. HV 67 ABCN OPERATED13. LV 67 ABCN OPERATED14. 51 O/L RLY OPERATED15. NDR RLY OPERATED16. HV 99T OVER FLUX OPTD17. LV 99T OVER FLUX OPTD18. HV 400 BUSBAR OPERATED19. LV 220 BUSBAR OPERATED11. TIE CB A/R OPERATED

12. PSB OPERATED13. SOTF OPERATED14. 27 O/V STG-1/2 OPERATED15. 51 STUB-1/2 OPERATED16. 87HZ / LZ TEED-1/2 OPERATED17. MAIN CB LBB OPERATED18. TIE CB LBB OPERATED19. DIRECT TRIP CH-1/2 TRIP20. 21M1 / 21M2 CARRIER RECEIVE21. 86 GR-A/B RELAY OPERATED22. 67N DEF/TEF RLY OPERATED23. DF/DT RELAY OPERATED

19. LV 220 BUSBAR OPERATED20. HV MAIN CB LBB OPERATED21. HV TIE CB LBB OPERATED22. LV MAIN CB LBB OPERATED23. HV 86 GR-A/B RELAY OPTD24. LV 86 GR-A/B RELAY OPTD25. AT/F 21T UZ RELAY OPERATED

26. OIL TEMP HIGH TRIP27. WNDG TEMP HV/IV/LV TRIP28. BUCHHOLZ MAIN/OLTC TRIP29. PRD 1/ 2 TRIP30. AT/F NEUTRAL CURRENT TRIP

CONFIGUARATION CONFIGUARATION OF CONTROL & OF CONTROL &

RELAY PANELS IN RELAY PANELS IN ONE AND HALFONE AND HALF

CIRCUIT BREAKER CIRCUIT BREAKER CIRCUIT BREAKER CIRCUIT BREAKER SCHEME SCHEME


ADE/MRT(PROTECTION)

CONFIGUARATION OF C & R PANELCONFIGUARATION OF C & R PANEL

BUSBAR PANEL CB RELAY PANELLINE PROTECTION

PANEL

1. BCU

2. BUS-1 V&F LED MFM WITH MODBUS

3. BUS-2 V&F LED MFM WITH MODBUS

4. BUSBAR CENTRAL UNIT

1. BAY CONTROL UNIT

2. BREAKER FAILURE RELAY

3. AUTO RECLOSURE RELAY

4. CHECK SYNCHRONISING RELAY

1. MAIN-1 NUM. DIST. PROT

2. MAIN-2 NUM. DIST. PROT.

3. O/V STAGE-1 (EXT/IN BUILT)

4. O/V STAGE-2 (EXT/IN BUILT)4. BUSBAR CENTRAL UNIT

5. BB OUT OF SERVICE SEL SWITCH

6. BUS-1 ES CMR

7. BUS-2 ES CMR

8. DC-1 HEALTHY INDICATION

9. DC-2 HEALTHY INDICATION

10. BUSBAR PROT AUX RELAYS

11. CLOSING AUX RELAYS

* IN CASE OF DUPLICATE

4. CHECK SYNCHRONISING RELAY

5. CB ALARM RELAYS

6. CB TRIP CKT SUPERVISION RELAYS

7. 3-PH TRIP UNITS 86-GA, 86-GB &

96/50Z

8. 1-PH TRIP RELAYS M1, M2 - 1 2 Nos

9. DIRECT TRIP RECEIVE RELAYS

10. DC SUPERVISION RELAYS

4. O/V STAGE-2 (EXT/IN BUILT)

5. DISTURBANCE RECORDER(EXT/INBUILT)

6. DISTANCE TO FAULT (EXT/ INBUILT)


8. TEED-1 PROTECTION

9. TEED-2 PROTECTION

10. STUB-1/2 PROTECTION (EXT/ INBUILT)

11. MAIN-1 CARRIER SEL.SWITCH* IN CASE OF DUPLICATE PROTECTION 2 NOS BUSBAR CENTRAL UNITS ARE AVAILABLE

11. U/V RELAY E/S I/L

12. CB EMERGENCY TNC SWITCH

13. CLOSING AUX RELAYS

14. ENERGY METER WITH TTB

15. PANEL INDICATING LABEL

12. MAIN-2 CARRIER SEL.SWITCH

13. CARRIER RECEIVE RELAYS

14.PANEL INDICATING LABEL

CONFIGUARATION OF C & R PANELCONFIGUARATION OF C & R PANELTRANSFORMER

PROTECTION PANEL

BUS REACTOR

CB RELAY PANEL

LINE / BUS REACTOR

PROTECTION PANEL

1. T/F DIFFERENTIAL PROTECTION-1

2. T/F DIFFERENTIAL PROTECTION-2

3. DIRECTIONAL O/L E/F RELAYS-HV

4. DIRECTIONAL O/L E/F RELAYS-LV

1. BAY CONTROL UNIT

2. BREAKER FAILURE RELAY

3. CB ALARM RELAYS


1. REACTOR DIFFERENTIAL PROT

2. REF PROTECTION RELAY

3. REACTOR IMPEDENCE PROTECTION

4. CVT SELECTION RELAYS4. DIRECTIONAL O/L E/F RELAYS-LV

4. OVER FLUX PROTECTION-HV & LV

5. OVER LOAD PROTECTION

6. VOLTAGE SELECT RELAYS- HV & LV

7. FUSE FAILURE RELAY- HV & LV

8. AUX RELAYS FOR T/F TROBLES

9. CIRCUIT LABEL


5. 3-PH TRIP UNITS 86-GA, 86-GB & 96/50Z


7. U/V RELAY E/S I/L

8. CB EMERGENCY TNC SWITCH

9. MFM WITH TTB

10. PANEL INDICATING LABEL

4. CVT SELECTION RELAYS

5. FLAG RELAYS

6. AUX RELAYS

7. TIMERS

8. CIRCUIT LABEL

IN ADDITION TO THE ABOVE THE FOLLOWING PANELS WILL BE AVAILABLE1. CONTROL & RELAY PANEL B/C, B/S, TBC (AS & WHEN REQ)2. COMMON CONTROL PANEL IS PART OF BUSBAR PANEL

I. NOMINCLATURE FOR PANELS ARE NORMALLYMAIN CB C&RPANEL – RLA, TIE CB C&R PANEL – RTB, HV CB C&RPANEL – RTRA, LV CB C&R PANEL – RTRC, LINE PROTECTION PANEL – RLB, ICT PROTECTION PANEL – RTRB, LINE REACTOR PROTECTION PANEL – RLRC, BUS REACTOR PROTECTION PANEL – RBRA, BUS

BAR PANEL – RBB,

400KV & 220KV BUSBAR & COMMON CONTROL PANEL400KV & 220KV BUSBAR & COMMON CONTROL PANEL

4RBB 2 RBB

MFM1 MFM2

� APTRANSCO IS FOLLOWING SINGLE BUS BAR PROTECTION.

� POWERGRID IS FOLLOWING DUPLICATE BUS BAR PROTECTION.

� ABB, AREVA, SIEMENS, TOSHIBA ARE HAVING DISTRIBUTED ARCHITECTURE.

� ABB, AREVA, GE, ERL PHASE, SEL ARE HAVING CENTRALISED ARCHITECTURE.

BCU

MFM1 MFM2

BUSBARCENTRAL UNIT

DC

-1

DC

-289

BB

1

AE

CM

R

89

BB

2

AE

CM

R BusBarAux

relays

BCU

BUSBARCENTRAL UNIT

DC

-1

DC

-2

89

BB

1

AE

CM

R

89

BB

2

AE

CM

R BusBarAux

relays

HAVING CENTRALISED ARCHITECTURE.� LBB IS THE PART OF BUSBAR IS LATEST

CONCEPT.� INCASE OF DISTRIBUTED ARCHITECTURE

BAY/PERIPHERAL UNIT IS DATA AQUSITION UNIT AND COMMUNICATE TO CENTRAL UNIT THROUGH FIBER OPTIC CABLE.

� DISTRIBUTED ARCHITECTURE - LBB IS INBUILT LOGIC.

� CENTRALISED ARCHITECTURE - LBB IS STAND ALONE.STAND ALONE.

FINALLY THE CONCEPT AS FOLLOWS IN FUTURE

� FOR FEEDER : REDUNDANT DISTANCE PROTECTION.

� FOR ICT : REDUNDANT DIFFERENTIAL PROTECTION.

� FOR BUSBAR : REDUNDANT BUSBAR PROTECTION.

400KV LINE + REACTOR CB RELAY & PROTN PANEL400KV LINE + REACTOR CB RELAY & PROTN PANEL

BAY1 BCU

4RLA 4RLB

21L1BAY2 BCU

4RTB24RLRC1/RBR3

87R

75A,B,L

A/R+SC79+25

LBB/ BU

50Z

CB

TROUBLES

& ALARMS

TRIP COIL1 & 2

HEALTHYLEDS

86 GR-A

186R1,Y1,B1

R2,Y2,B2

DC

-1

86 GR-B

286R1,Y1,B1

R2,Y2,B2

DC

-2

CB PB

9650Z

21L2

59-1&2

D/T-1Receive

D/T-2Receive

A/R+SC79+25

LBB/ BU

50Z

CB

TROUBLES

& ALARMS

TRIP COIL1 & 2

HEALTHYLEDS

86 GR-A

186R1,Y1,B1

R2,Y2,B2

DC

-1

86 GR-B

286R1,Y1,B1

R2,Y2,B2

DC

-2

CB PB

50 ZT

64R

Reactor Trouble

Alarms & Trips

21R

Receive

Relays

Receive

Relays

99R

400KV ICT CB RELAY & PROTN PANEL400KV ICT CB RELAY & PROTN PANEL

BAY3 BCU

4RTRA3 4RTRB3

87T1

475A,B,L

275A,B

LV BAY BCU

4RTRC3

BAY2 BCU

4RTB2

LBB/ BU

50Z

CB

TROUBLES

& ALARMS

TRIP COIL1 & 2

HEALTHYLEDS

86 GR-A

DC

-186

GR-B DC

-2

CB PB

InterTrip

Relays

96/50Z

87T2

Transformer Trouble

Alarms & Trips

67HV 67IV

99HV 99IV

LBB/ BU

50Z

CB

TROUBLES

& ALARMS

TRIP COIL1 & 2

HEALTHYLEDS

86 GR-A

DC

-1

86 GR-B D

C-2

CB PB

InterTrip

Relays

96/ 50Z

A/R+SC79+25

LBB/ BU

50Z

CB

TROUBLES

& ALARMS

TRIP COIL1 & 2

HEALTHYLEDS

86 GR-A

186R1,Y1,B1

R2,Y2,B2

DC

-1

86 GR-B

286R1,Y1,B1

R2,Y2,B2

DC

-2

CB PB

50 ZT

MFM

99HV

MFM

220KV FEEDER CB RELAY & PROTN PANEL220KV FEEDER CB RELAY & PROTN PANEL

BAY1 BCU

2RLA1 2RLB1

21L1

75A75B

A/R+SC79+25

LBB/ BU

50Z

CB

TROUBLES

& ALARMS

TRIP COIL1 & 2

HEALTHYLEDS

86 GR-A

186R1,Y1,B1

R2,Y2,B2

DC

-186

GR-B

286R1,Y1,B1

R2,Y2,B2D

C-2

CB PB

TTS96 /50Z

21L2

D/T-1Receive

D/T-2Receive

MFM

Receive

Relays

Receive

Relays

220KV BC, TBC & BS CB RELAY & PROTN PANELS220KV BC, TBC & BS CB RELAY & PROTN PANELS

BC BCU

2RBC

TBC BCU

2RTBC

BS BCU

2RBS

LBB/ BU

50Z

CB

TROUBLES

& ALARMS

TRIP COIL1 & 2

HEALTHYLEDS

86 GR-A

DC

-1

86 GR-B D

C-2

CB PB

LBB/ BU

50Z

96 50Z

LBB/ BU

50Z

CB

TROUBLES

& ALARMS

TRIP COIL1 & 2

HEALTHYLEDS

86 GR-A

186R1,Y1,B1

R2,Y2,B2

DC

-1

86 GR-B

286R1,Y1,B1

R2,Y2,B2

DC

-2

CB PB

96 50Z

A/R+SC79+25

LBB/ BU

50Z

CB

TROUBLES

& ALARMS

TRIP COIL1 & 2

HEALTHYLEDS

86 GR-A

DC

-1

86 GR-B D

C-2

CB PB

LBB/ BU

50Z

96 50Z

CB PB

50/51 A,B

C,N

CB PB

50/51 A,B

C,N

SUBSTATION AUXILIARIES & TERMINAL PANELSSUBSTATION AUXILIARIES & TERMINAL PANELS

BCU1 BCU2

SSAUX

For AC

415V

System-1

For AC

415V

System-2

For DC

220V

System-1

For DC

220V

System-2

AlarmUnit

Base System


CE

COM581

AlarmUnit

Hot Standby

Main Server Redunt ServerABB Network Partner AG

CE

COM581

BCU3 BCU4

BCU5 BCU6

BCU7 BCU8

System-1 System-2

For DC

48V

System-1

For DC

48V

System-2

For Air

condition

System

For Fire

Fighting

System

For Diesel

Generator

For fire

& Smoke

Network PartnerSSLTA 88 SRS485M SREDU/MSRS485M

RS232 RS485 RS485

SERVICE

1MRSC60029 1MRSC60028 1MRSC60028 1MRSC60028 1MRSC60028 1MRSC60028 1MRSC60028

Ethernet Switch

CommunicationGateway

Network PartnerSSLTA 88 SRS485M SREDU/MSRS485M

RS232 RS485 RS485

SERVICE

1MRSC60029 1MRSC60028 1MRSC60028 1MRSC60028 1MRSC60028 1MRSC60028 1MRSC60028

Ethernet Switch

Line Printer forAlarm / Event Metering Values

DOT Matrix Printer

Router toALDC/SLDC

BCU9 BCU10

Generator

System

& Smoke

Detector


CE

COM581

Surveillancesystem

SUBSTATION AUTOMATION

Base System

ServiceModem

AlarmAlarm

Alarm/EventLine Printer

Au

xil

iary

Ala

rm

An

nu

ncia

tio

nBase System

DM PrinterFor 15 Min

Metering & Trends

HardcopyPrinter +

MFD

GPSMeinberg

COMMUNICATION GATEWAY TO

RCC & ALDC

Engineering & DRwork Station

LAPTOP

2 Ports for RCC & 2 Ports for ALDC/SLDC

Network PartnerSSLTA 88SRS485M SREDU/MSRS485M

RS232 RS485 RS485SERVICE

1MRSC600291MRSC600281MRSC600281MRSC600281MRSC600281MRSC600281MRSC60028

Rugged Com/Equivalent Ethernet Switches forming ‘Redundant Managed switched Ethernet LAN on fiber optic medium Interbay bus

on IEC61850 Communication Gate way with hot standby for RCC and SLDC’ For Control and Protection Relays.

Network PartnerSSLTA 88SRS485M SREDU/MSRS485M

RS232 RS485 RS485SERVICE

1MRSC600291MRSC600281MRSC600281MRSC600281MRSC600281MRSC600281MRSC60028

AlarmUnit

AlarmUnit

Ethernet (TCP/IP)

Printer Server Au

xil

iary

Ala

rm

An

nu

ncia

tio

n

POWER

V1

OVP

LOCKACQR SATELLITE CONTROLLED CLOCK

GPS 166

NORMAL OPERATION

WED 11.12.1996MEZ 11.42.25

SV 24 > SYN

MENUCLRACK

NEXT INC

MEINBERG

Meinberg


RCC LDC

RCC & ALDC

DIGITAL

PLCC/

DIGITAL

PLCC/

DIGITAL

PLCC/

?LOCAL

REMOTE

SET

OPERATION

M

M

M

?LOCAL

REMOTE

SET

OPERATION

M

M

M

?LOCAL

REMOTE

SET

OPERATION

M

M

M

?LOCAL

REMOTE

SET

OPERATION

M

M

M

?LOCAL

REMOTE

SET

OPERATION

M

M

M

?LOCAL

REMOTE

SET

OPERATION

M

M

M

12345678

910111213141516

CE

12345678

910111213141516

CE

12345678

910111213141516

CE

12345678

910111213141516

CE

12345678

910111213141516

CE

12345678

910111213141516

CE

CE

910111213141516

910

111213141516

910111213141516

CE

ABB Network Partner AGREL511

CE


CE


910111213141516

910111213141516

910111213141516

910111213141516

910111213141516

910111213141516

OTH

AVR

HYD

RANEM

EM

EM

EM

EM

EM

EM

EM

EM

PLCC/

OLTE

SYSTEM

CARR

PROT

SYSTEM

CARR

PROT

SYSTEM

CARR

PROT

SYSTEM

CARR

PROT

SYSTEM

CARR

PROT

SYSTEM

CARR

PROT

SYSTEM

PLCC/

OLTE

SYSTEM

PLCC/

OLTE

SYSTEM

OTH

AVR

HYD

RAN

OTH

AVR

HYD

RAN

TRIP LOGICS TRIP LOGICS OF OF OF OF




GROUPGROUP--A & GROUPA & GROUP--B TRIPPINGSB TRIPPINGSFOR 400KV STATIONS THERE SHALL BE TWO SEPARATE BATTERY SYSTEMS AVAILABLE FORPROTECTION, CONTROL & TRIPPING/CLOSING OPERATIONS. TO OBTAIN REDUNDENCY AND TO BEABLE TO TAKE PROTECTION OUT FOR MAINTANENCE, WHILE EQUIPMENT IS IN SERVICE, THERELAYS ARE ELECTRICALLY AND PHYSICALLY SEGREGATED IN TO TWO GROUPS. GROUPING ISDONE TO THE EXTENT POSSIBLE IN SUCH A WAY THAT EACH GROUP CAN INDEPENDENTLYCARRYOUT PROTECTIVE FUNCTIONS WITH NEAR EQUAL REDUNDENCY. INTER CONNECTION OFTHESE TWO GROUPS SHALL NOT BE GENERALLY BE ATTEMPTED.DISTRIBUTION OF DC SUPPLY SHALL BE DONE BAY WISE TO FEED THE FOLLOWING1. PROTECTION1. PROTECTION2. CB CONTROL3. ISOLATOR / EARTH SWITCH CONTROL4. ANNUNCIATION / INDICATION

LINE PROTECTIONLINE PROTECTION TRANSFORMER PROTECTIONTRANSFORMER PROTECTION REACTOR PROTECTIONREACTOR PROTECTION

GROUPGROUP--AAMAIN-1 : 21L1: LINE PROTECTION

M1 BUILT IN FUNCTIONSTEED-1 PROTECTION (87 TEED1)OVER VOLTAGE STAGE-1 PROT(59L1)

GROUPGROUP--AAMAIN1: 87T1 : ICT DIFF PROTN

B/U : 67HV: ICT HV BACKUP RELAYB/U : 21T: ICT B/U IMP RELAYT/F HV OVERFLUX RELAYOIL TEMP HIGH TRIP

GROUPGROUP--AAMAIN1: 87R1 : REACTOR DIFF PROT

B/U : 21R: REACTOR B/U IMP RELAYOIL TEMP HIGH TRIPPRESURE RELIEF TRIP

GROUPGROUP--BBDIRECT TRIP CHANNEL-1 RECEIVED

GROUPGROUP--BBMAIN-2 : 87L2 : LINE PROTECTIONM2 BUILT IN FUNCTIONSTEED-2 PROTECTION (87 TEED2)OVER VOLTAGE STAGE-2 PROT

(59L2)DIRECT TRIP CHANNEL-2 RECEIVED

GROUPGROUP--BBBBLBB/BFR RELAY

BUSBAR PROTECTION

PRESURE RELIEF TRIP

TERITIARY DELTA WNDG NDR PROT

GROUPGROUP--BBMAIN2 : 87T2: ICT DIFF PROTNB/U : 67LV: ICT LV BACKUP RELAYB/U : 51O/C: ICT NCT B/U RELAY

T/F LV OVERFLUX RELAYOVER LOAD PROT (ALARM ONLY)BUCHHOLZ TRIPOLTC BUCHHOLZ TRIPWINDING TEMP HIGH TRIP

LOW/ HIGH OIL LEVEL TRIP

GROUPGROUP--BBMAIN2: 87R2 : REACTOR DIFF PROT

BUCHHOLZ TRIPWINDING TEMP HIGH TRIPLOW/ HIGH OIL LEVEL TRIPFIRE PROTECTION TRIP

MAIN CB FOR LINE (1MAIN CB FOR LINE (1--52CB)TRIPPING LOGICS52CB)TRIPPING LOGICS

PROTECTION

RELAY

SY

MB

OL

GR

OU

P

OU

TP

UT

MAIN-1 PROTECTION 21 L1 A 1-PH X X X X X X X

INIT

IATE

M_C

B 1P

H TR

IP U

NIT

GR-

A

INIT

IATE

M_C

B 3P

H TR

IP U

NIT

GR-

A

INIT

IATE

M_C

B 1P

H TR

IP U

NIT

GR-

B

INIT

IATE

M_C

B 3P

H TR

IP U

NIT

GR-

B

INIT

IATE

T_C

B 1P

H TR

IP U

NIT

GR-

A

INIT

IATE

T_C

B 3P

H TR

IP U

NIT

GR-

A

INIT

IATE

T_C

B 1P

H TR

IP U

NIT

GR-

B

INIT

IATE

T_C

B 3P

H TR

IP U

NIT

GR-

B

START

M_C

B A/R

REL

AY

START

T_C

B A/R

REL

AY

BLOC

K M

_CB

A/R

REL

AY

BLOC

K T

_CB

A/R

REL

AY

MAIN

-1/M

AIN

-2 C

ARR

IER

SEND

INIT

IATE

ALA

RM

INIT

IATE

SCA

DA (D

R & S

OE)

DIRE

CT T

RIP

CARR

IER

SEND

INIT

IATE

400

KV B

/B P

ROT

MAIN-1 PROTECTION 21 L1 A 1-PH X X X X X X X

MAIN-2 PROTECTION 21 L2 B 1-PH X X X X X X X

SOTF, PSB IN BUILT FUNCTIONS OF DISTANCE SCHEME

OVER VOLTAGE

STAGE-1 & STAGE-2

(BUILT – IN 21 M1)

59 L1 & L2 A 3-PH X X X X X X X

OVER VOLTAGE

STAGE-1 & STAGE-2

(BUILT – IN 21 M2)

59 L1 & L2 B 3-PH X X X X X X X

STUB, TOC, BOC,

TEF, DEF,

(BUILT- IN 21M1)

A 3-PH X X X X X X X

(BUILT- IN 21M1)

STUB, TOC, BOC,

TEF, DEF,

(BUILT- IN 21M2)

B 3-PH X X X X X X X

TEED PROT-1 87T HZ A 3-PH X X X X X X X

TEED PROT-2 87T LZ B 3-PH X X X X X X X

DIRECT TRIP CH-1 RECD A 3-PH X X X X

DIRECT TRIP CH-2 RECD B 3-PH X X X X

M_CB BFR / LBB PROT B 3-PH X X X

T_CB BFR / LBB PROT B 3-PH X X

MAIN CB FOR LINE (1MAIN CB FOR LINE (1--52 CB) TRIPPING LOGICS52 CB) TRIPPING LOGICS

PROTECTION

RELAY

SY

MB

OL

GR

OU

P

OU

TP

UT

AUTO RECLOSURE RELAY 1-PH & 3-

INIT

IATE

T_C

B A/R

PRI

ORIT

Y

CLOS

E M

AIN

CB

TO S

CADA

(DR

& S

OE)

INIT

IATE

M_C

B T

RIP

COIL

-1

INIT

IATE

M_C

B T

RIP

COIL

-2

START

LBB

/BFR

M_C

B

89LE

C L

OSE

PERM

ISSI

ON

INIT

IATE

ALA

RM

AUTO RECLOSURE RELAY

(BUILT IN 21M1 & 21M2)79 A/R A&B

1-PH & 3-PH

X X X X

SYNC CHECK RELAY

(BUILT IN 21M1 & 21M2)25 SYNC A&B 3-PH X X X X

1-PH TRIP UNIT GR-A 186 A 1-PH X X X

3-PH TRIP UNIT GR-A 86 GR A A 3-PH X X X X X

1-PH TRIP UNIT GR-B 286 B 1-PH X X X

3-PH TRIP UNIT GR-B 86 GR B B 3-PH X X X X X

TRIP SIGNAL FROM 400KV

BUSBAR PROTECTION96 BB 3-PH X X X

LINE UNDER VOLTAGE RELAY 27 UV X

TIE CB TRIPPING LOGICSTIE CB TRIPPING LOGICS

PROTECTION

RELAY

SY

MB

OL

GR

OU

P

OU

TP

UT

INIT

IATE

M_C

B 1P

H TR

IP U

NIT

GR-

A

INIT

IATE

M_C

B 3P

H TR

IP U

NIT

GR-

A

INIT

IATE

M_C

B 1P

H TR

IP U

NIT

GR-

B

INIT

IATE

M_C

B 3P

H TR

IP U

NIT

GR-

B

INIT

IATE

T_C

B 1P

H TR

IP U

NIT

GR-

A

INIT

IATE

T_C

B 3P

H TR

IP U

NIT

GR-

A

INIT

IATE

T_C

B 1P

H TR

IP U

NIT

GR-

B

INIT

IATE

T_C

B 3P

H TR

IP U

NIT

GR-

B

INIT

IATE

ALA

RM

INIT

IATE

SCA

DA (D

R & S

OE)

DIRE

CT T

RIP

CARR

IER

SEND

INIT

IATE

M_C

B 1P

H TR

IP U

NIT

GR-

A

INIT

IATE

M_C

B 3P

H TR

IP U

NIT

GR-

A

INIT

IATE

M_C

B 1P

H TR

IP U

NIT

GR-

B

INIT

IATE

M_C

B 3P

H TR

IP U

NIT

GR-

B

INIT

IATE

T_C

B TR

IPCO

IL-1

& C

OIL-

2

START

LBB

/BFR

OF

T_CB

CLOS

E T_

CB

T_CB BFR / LBB PROT 50 ZT B 3-PH X X X X X

M_CB BFR / LBB PROT

(152 CB & 352 CB)50 Z B 3-PH X X X X

AUTO RECLOSURE RELAY79

A/R

A

&

B

1-PH &

3-PH

X X X

INIT

IATE

M_C

B 1P

H TR

IP U

NIT

GR

INIT

IATE

M_C

B 3P

H TR

IP U

NIT

GR

INIT

IATE

M_C

B 1P

H TR

IP U

NIT

GR

INIT

IATE

M_C

B 3P

H TR

IP U

NIT

GR

INIT

IATE

T_C

B 1P

H TR

IP U

NIT

GR

INIT

IATE

T_C

B 3P

H TR

IP U

NIT

GR

INIT

IATE

T_C

B 1P

H TR

IP U

NIT

GR

INIT

IATE

T_C

B 3P

H TR

IP U

NIT

GR

INIT

IATE

ALA

RM

INIT

IATE

SCA

DA (D

R & S

OE)

DIRE

CT T

RIP

CARR

IER

SEND

INIT

IATE

M_C

B 1P

H TR

IP U

NIT

GR

INIT

IATE

M_C

B 3P

H TR

IP U

NIT

GR

INIT

IATE

M_C

B 1P

H TR

IP U

NIT

GR

INIT

IATE

M_C

B 3P

H TR

IP U

NIT

GR

152

252

152

152

152

252

252

252

352

352

352

352

INIT

IATE

T_C

B TR

IPCO

IL

START

LBB

/BFR

OF

T_CB

252

252

CLOS

E T_

CB25

2

SYNC CHECK RELAY 25 3-PH X X X

1-PH TRIP UNIT GR-A 186 A 1-PH X X

3-PH TRIP UNIT GR-A 86A A 3-PH X X X X

1-PH TRIP UNIT GR-B 286 B 1-PH X X

3-PH TRIP UNIT GR-B 86B B 3-PH X X X X

DIRECT TRIP CH-1 RECD A 3-PH X

DIRECT TRIP CH-2 RECD B 3-PH X

MAIN CB FOR AT/F (3MAIN CB FOR AT/F (3--52CB)TRIPPING LOGICS52CB)TRIPPING LOGICS

PROTECTION

RELAY

SY

MB

OL

GR

OU

P

OU

TP

UT

DIFFERENTIAL RELAY 87T(LZ) A 3-PH X X X X X X

INIT

IATE

M_C

B 3P

H TR

IP U

NIT

GR-

A

INIT

IATE

M_C

B 3P

H TR

IP U

NIT

GR-

B

INIT

IATE

T_C

B 3P

H TR

IP U

NIT

GR-

A

INIT

IATE

T_C

B 3P

H TR

IP U

NIT

GR-

B

INIT

IATE

ALA

RM

INIT

IATE

SCA

DA (

SOE)

INTE

R TR

IP C

IRCU

IT H

V & L

V

INIT

IATE

400

KV B

/B P

ROT

INIT

IATE

LV_

CB 3

PH T

RIP

UNIT

GR-

A

INIT

IATE

LV_

CB 3

PH T

RIP

UNIT

GR-

B

INIT

IATE

M_C

B TR

IP C

OIL-

1

INIT

IATE

M_C

BTRI

P CO

IL-2

INIT

IATE

220

KV B

/B P

ROT

START

M_C

B LB

B/BF

R RE

LAY

START

LV_

CB L

BB/B

FR R

ELAY

INIT

IATE

LV_

CB T

RIP

COIL

-1

INIT

IATE

LV_

CBTR

IP C

OIL-

2

DIFFERENTIAL RELAY 87T(LZ) A 3-PH X X X X X X

HV BACKUP PROTECTION 67 ABCN A 3-PH X X X X X X

HV OVER FLUX PROT 99T HV A 3-PH X X X X X X

OVER LOAD RELAY 51 O/L A 3-PH X X X X X X

HV PROT TRIP UNIT GR-A & B 86 GR-A/B A/B 3-PH X X X X X X X

REF PROTECTION 64T(HZ) B 3-PH X X X X X X

TEED PROT-1 / 2 87T HZ/LZ A/B 3-PH X X X X X X X X X X X

STUB PROT 50 STUB A 3-PH X X X X X X

AT/F TROUBLE TRIP HV & LV 86 GR-A/B A/B 3-PH X X X X X X X X X

AT/F TROUBLE ALRM X X

M_CB BFR / LBB PROT 50Z B 3-PH X X X X X X

T_CB BFR / LBB PROT 50ZT B 3-PH X X X X X X

LV_CB BFR / LBB PROT 50Z B 3-PH X X X X X X X

400KV B/B PROT 87 BB 96 3-PH X X X X X

220KV B/B PROT 87 BB 96 3-PH X X X X X X

LV BACKUP PROTECTION 67 ABCN B 3-PH X X X X X X

LV OVER FLUX PROT 99T LV B 3-PH X X X X X X

TERI NEUTRAL DISP PROT 151N A 3-PH X X X X X X

LV PROT TRIP UNIT GR-A & B 86 GR-A/B A/B 3-PH X X X X X X X

PROTECTION TRIP SCHEMEPROTECTION TRIP SCHEME





21 MAIN 1

C


87 T LZ

BUS-1 BUS-2

1-52CB 3-52CB2-52CB

HSTRHSTR

ABBABBREL521REL521

8686--BBMTR/MTR/

8686--BBMTR/MTR/

HSTRHSTR

8686--BBMTR/MTR/

HSTRHSTR



C

E

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16


21 MAIN 2

C

E

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16


87 T HZ

REL521REL521MAINMAIN--11MTR/MTR/HSTRHSTR

MTR/MTR/HSTRHSTR

MTR/MTR/HSTRHSTR

8686--A : GROUPA : GROUP--A MASTER TRIP RELAY / HIGH SPEED TRIP RELAY A MASTER TRIP RELAY / HIGH SPEED TRIP RELAY 8686--B : GROUPB : GROUP--B MASTER TRIP RELAY / HIGH SPEED TRIP RELAYB MASTER TRIP RELAY / HIGH SPEED TRIP RELAY

C

E

C

E

MAINMAIN--1/ MAIN1/ MAIN--22ZONEZONE--1 & SINGLE PHASE FAULT1 & SINGLE PHASE FAULT

ACTIVE START TRIP

REL 521REL 521INITIATE MAIN CB GR-A 1-PH TRIP UNIT ( INTURN IT WILL TRIP 1-POLE )

INITIATE TIE CB GR-A 1-PH TRIP UNIT ( INTURN IT WILL TRIP 1-POLE )

START MAIN CB AUTO RECLOSURE

START TIE CB AUTO RECLOSURE

C

E

DISPLAY

REL 316REL 316

TO EVENT RECORDER ( SOE/ SCADA )

TO DISTURBANCE RECORDER

CARRIER SEND

INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)

INITIATE ALARM (ANNUNCIATION COME)

INITIATE MAIN CB GR-B 1-PH TRIP UNIT ( INTURN IT WILL TRIP 1-POLE )

TO LBB/BFR INITIATION

C

E

DISPLAY

ACTIVE START TRIP

REL 316REL 316 INITIATE TIE CB GR-B 1-PH TRIP UNIT ( INTURN IT WILL TRIP 1-POLE )



START MAIN CB AUTO RECLOSURE

START TIE CB AUTO RECLOSURE

CARRIER SEND




AUTO RECLOSUREAUTO RECLOSURE�� CONDITIONS REQUIRED FOR A/R OPERATIONCONDITIONS REQUIRED FOR A/R OPERATION1.1. CB CLOSE CONDITION.CB CLOSE CONDITION.2.2. TIME LAPSED MORE THAN RECLAIM TIME.TIME LAPSED MORE THAN RECLAIM TIME.

3.3. OPERATING PRESSURE OF CB SUITABLE FOR AUTORECLOSUREOPERATING PRESSURE OF CB SUITABLE FOR AUTORECLOSUREOPERATION.OPERATION.

4.4. DC SUPPLY TO AUTORECLOSURE SHOULD BE AVAILABLE. DC SUPPLY TO AUTORECLOSURE SHOULD BE AVAILABLE. 5.5. PREPARE 3PREPARE 3--PH TRIP RELAY SHOULD BE RELEASED CONDITION.PH TRIP RELAY SHOULD BE RELEASED CONDITION.5.5. PREPARE 3PREPARE 3--PH TRIP RELAY SHOULD BE RELEASED CONDITION.PH TRIP RELAY SHOULD BE RELEASED CONDITION.

6.6. NO BLOCKING SIGNAL TO AUTORECLOSURE RELAY.NO BLOCKING SIGNAL TO AUTORECLOSURE RELAY.7.7. POLE DISTURBANCE RELAY TIME SHOULD BE MORE THANPOLE DISTURBANCE RELAY TIME SHOULD BE MORE THAN

TWICE OF DEAD TIME OF AUTO RECLOSURE.TWICE OF DEAD TIME OF AUTO RECLOSURE.

7.7. CARRIER FAIL SIGNAL SHOULD NOT COME AT BOTH ENDS.CARRIER FAIL SIGNAL SHOULD NOT COME AT BOTH ENDS.8.8. CARRIER SWITCH SHOULD BE IN SERVICE CONDITION.CARRIER SWITCH SHOULD BE IN SERVICE CONDITION.9.9. SINGLE PHASE & ZONESINGLE PHASE & ZONE--1 FAULT ONLY.1 FAULT ONLY.

�� AUTO RECLOSURE OPERATIONAUTO RECLOSURE OPERATION1.1. TRIP MAIN CB SINGLE POLE.TRIP MAIN CB SINGLE POLE.1.1. TRIP MAIN CB SINGLE POLE.TRIP MAIN CB SINGLE POLE.2.2. TRIP TIE CB SINGLE POLE.TRIP TIE CB SINGLE POLE.

3.3. CLOSE MAIN CB AFTER DEAD TIME.CLOSE MAIN CB AFTER DEAD TIME.4.4. IF A/R SUCCESS FOR MAIN CB THEN AFTER SUPPLEMENTARY TIME IF A/R SUCCESS FOR MAIN CB THEN AFTER SUPPLEMENTARY TIME

DELAY CLOSE TIE CB.(NORMALLY SUPPLEMENTARY TIME DELAY IS DEAD DELAY CLOSE TIE CB.(NORMALLY SUPPLEMENTARY TIME DELAY IS DEAD TIME)TIME)

5.5. IF A/R UNSUCCESS THEN TRIP MAIN & TIE CBs.IF A/R UNSUCCESS THEN TRIP MAIN & TIE CBs.6.6. IF MAIN CB OPEN CONDITION, THEN NO SUPPLEMENTARY DELAY TIME IF MAIN CB OPEN CONDITION, THEN NO SUPPLEMENTARY DELAY TIME

FOR TIE A/R. IT WILL OPERATE ITs OWN DEAD TIME.FOR TIE A/R. IT WILL OPERATE ITs OWN DEAD TIME.

MAINMAIN--1/ MAIN1/ MAIN--22ZONEZONE--1 & TWO / THREE PHASE FAULT1 & TWO / THREE PHASE FAULT

ACTIVE START TRIP

REL 521REL 521INITIATE MAIN CB GR-A 1-PH TRIP UNITS ( INTURN IT WILL TRIP 3-POLES )

INITIATE TIE CB GR-A 1-PH TRIP UNITS ( INTURN IT WILL TRIP 3-POLES )

BLOCK MAIN CB AUTO RECLOSURE

BLOCK TIE CB AUTO RECLOSURE

C

E

DISPLAY

REL 316REL 316



CARRIER SEND



INITIATE MAIN CB GR-B 1-PH TRIP UNITS ( INTURN IT WILL TRIP 3-POLES )


C

E

DISPLAY

ACTIVE START TRIP

REL 316REL 316 INITIATE TIE CB GR-B 1-PH TRIP UNITS ( INTURN IT WILL TRIP 3-POLES )





CARRIER SEND




MAINMAIN--1/ MAIN1/ MAIN--22ZONEZONE--2 & 1 / 2 / 3 PHASE FAULT2 & 1 / 2 / 3 PHASE FAULT

ACTIVE START TRIP





CARRIER SIGNAL RECEIVED

& ZONE-2 STARTER IS PICKUP CONDITION

C

E

DISPLAY

REL 316REL 316




INITIATE ALARM (ANNUNCIATION CAME)


IS PICKUP CONDITION TO LBB/BFR INITIATION

C

E

DISPLAY

ACTIVE START TRIP






CARRIER SEND ( IF PUTT OR2 SCHEME SELECTED )



CARRIER SIGNAL RECEIVED

& ZONE-2 STARTER IS PICKUP CONDITION


MAINMAIN--1/ MAIN1/ MAIN--22ZONEZONE-- 3/4/5 & 1 / 2 / 3 PHASE FAULT3/4/5 & 1 / 2 / 3 PHASE FAULT

ACTIVE START TRIP





C

E

DISPLAY

REL 316REL 316




INITIATE ALARM (ANNUNCIATION CAME)



C

E

DISPLAY

ACTIVE START TRIP









DISTANCE SCHEME TRIPPING OUTPUTSDISTANCE SCHEME TRIPPING OUTPUTS

ACTIVE START TRIP

REL 521REL 521

MAIN CBMAIN CB TIE CBTIE CBCO CO

186 R

186 Y

TO TRIP COIL-1

TO TRIP COIL-2

186 R

186 Y

TO TRIP COIL-1

TO TRIP COIL-2

C

E

DISPLAY

REL 316REL 316

186 Y

186 B

TO TRIP COIL-1

TO TRIP COIL-2

TO TRIP COIL-1

TO TRIP COIL-2

186 Y

186 B

TO TRIP COIL-1

TO TRIP COIL-2

TO TRIP COIL-1

TO TRIP COIL-2

CO286 R

CO286 R

TO TRIP COIL-1

C

E

DISPLAY

ACTIVE START TRIP

REL 316REL 316

286 Y

286 B

TO TRIP COIL-1

TO TRIP COIL-2

TO TRIP COIL-1

TO TRIP COIL-2

TO TRIP COIL-1

TO TRIP COIL-2

286 Y

286 B

TO TRIP COIL-1

TO TRIP COIL-2

TO TRIP COIL-1

TO TRIP COIL-2

TO TRIP COIL-1

TO TRIP COIL-2

TRANSFORMER PROTECTIONTRANSFORMER PROTECTION(DIFFERENCIAL & REF / 3(DIFFERENCIAL & REF / 3--PH HZ DIFF PROTECTION)PH HZ DIFF PROTECTION)

ACTIVE START TRIP

RET 521RET 521INITIATE 400KV MAIN CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

INITIATE 400KV TIE CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

87 T187 T1

INITIATE 220KV MAIN CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

INITIATE 220KV TBC CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

C

E

DISPLAY

RET 316RET 316




87 T187 T1(LZ)(LZ)

INITIATE 400KV MAIN CB GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

C

E

DISPLAY

ACTIVE START TRIP

RET 316RET 316




87 T287 T2(LZ/HZ)(LZ/HZ)

INITIATE 400KV TIE CB GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )


INITIATE 220KV TBC CB GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

TRANSFORMER PROTECTIONTRANSFORMER PROTECTION( BACKUP DIRECTIONAL O/L & E/F PROTECTION FOR HV & LV)( BACKUP DIRECTIONAL O/L & E/F PROTECTION FOR HV & LV)

ACTIVE START TRIP

REF 610REF 610INITIATE 400KV MAIN CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )


67 HV 67 HV INITIATE 220KV MAIN CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )


C

E

DISPLAY

REX 521REX 521




67 HV 67 HV ABCNABCN


C

E

DISPLAY

ACTIVE START TRIP

REX 521REX 521




67 LV67 LVABCNABCN




MAIN LBBMAIN LBB

C

DISPLAY

ACTIVE START TRIP

REQ 650REQ 650

INITIATE BUSBAR PROTECTION ( INTURN IT WILL TRIP CONNECTED BUS CBs)

INITIATE TIE CB 86-GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

BLOCK MAIN CB & TIE CB AUTO RECLOSURE



CLOSE INTERLOCK OF MAIN CB & TIE CB

DIRECT TRANSFER TRIP-1 CARRIER SEND TO OTHER END


INITIATIONINITIATION

1-PH TRIP RELAYS OFMAIN-1 PROTECTION


86-GR-AMASTER TRIP RELAY

C

E

ACTIVE START TRIP

REQ 650REQ 650




INITIATE MAIN CB 86-GR-B 3-PH TRIP UNIT (TRIP BAY1 CB 3-POLES )

INITIATE MAIN CB 86-GR-B 3-PH TRIP UNIT ( TRIP BAY3 CB 3-POLES )

BLOCK MAIN CB OF BAY1 & BAY3 AUTO RECLOSURE


86-GR-BMASTER TRIP RELAY

96 BB BUSBAR RELAY

TIE LBBTIE LBBINITIATIONINITIATION


OF LINE-1(BAY1) & LINE-2 (BAY3)

1-PH TRIP RELAYS OF

C

E

DISPLAY

ACTIVE START TRIP


TO DISTURBANCE RECORDER (BAY1 & BAY3)



CLOSE INTERLOCK OF TIE CB


CLOSE INTERLOCK OF MAIN CB OF BAY1 & BAY 31-PH TRIP RELAYS OFMAIN-2 PROTECTION

OF LINE-1 (BAY1) &LINE-2 (BAY 3)



DIRECT TRANSFER TRIP-1 CARRIER SEND TO BAY1 & BAY3 LINES


MAIN LBBMAIN LBB

C

DISPLAY

ACTIVE START TRIP

RAICARAICA

INITIATE BUSBAR PROTECTION ( INTURN IT WILL TRIP CONNECTED BUS CBs)






INTER TRIP TO 220KV LV MAIN CB

INTER TRIP TO 220KV LV TBC CB

INITIATIONINITIATION



96 BB BUSBAR RELAY

C

E

ACTIVE START TRIP

RAICARAICA


INITIATE MAIN CB 86-GR-B 3-PH TRIP UNIT (TRIP BAY1 CB 3-POLES )

INITIATE MAIN CB 86-GR-B 3-PH TRIP UNIT ( TRIP BAY3 CB 3-POLES )

BLOCK MAIN CB OF BAY1 AUTO RECLOSURE


TIE LBBTIE LBBINITIATIONINITIATION


OF LINE-1(BAY1)

1-PH TRIP RELAYS OF

C

E

DISPLAY

ACTIVE START TRIP


TO DISTURBANCE RECORDER (BAY1)





CLOSE INTERLOCK OF MAIN CB OF BAY1 & BAY 31-PH TRIP RELAYS OFMAIN-2 PROTECTION

OF LINE-1 (BAY1)





LBB IS PART OF DISTRIBUTED ARCHITECTURELBB IS PART OF DISTRIBUTED ARCHITECTURE

186-R

186-Y

186-B

286-R

286-Y

286-B

MAIN CB (LINE SIDE) LBB & BUSBAR INPUT & OUTPUTSMAIN CB (LINE SIDE) LBB & BUSBAR INPUT & OUTPUTS

M_CB OPEN

M_CB CLOSE

BUS ISO OPEN

BUS ISO CLOSE

T_CB OPEN

T_CB CLOSE

TO DIRECT TRIP SEND CH1 (LBB OPTD)


TO DIRECT TRIP SEND CH1 (BB OPTD)


TO TIE LBB TRIP RELAY (50ZTX/96TIE)

TO TC-1T_CB CLOSE

86-A

86-B

96-A

96-B

CB

CL

OS

EP

UL

SE

96 H

IGH

SP

EE

DM

AS

TE

R T

RIP

RE

LA

Y

TO TC-2

TO TC-1

TO TC-2TIE LBB OPTD

TO 21 L1 (DR)

TO 21 L2 (DR)

TO CLOSE I/L

TO BAY UNIT

TO BCU (SOE & A/R BLK)


186-R

186-Y

186-B

286-R

286-Y

286-B

TIE CB LBB INPUT & OUTPUTSTIE CB LBB INPUT & OUTPUTS


TO M_T LBB TRIP RELAY (96 M_T CB)

T_CB OPEN

T_CB CLOSE

T_ ISO1 OPEN

T_ISO1 CLOSE

T_ISO2 OPEN

T_ISO2 CLOSE

TO DIRECT TRIP SEND CH1 (LINE RE SIDE)

TO DIRECT TRIP SEND CH2 (LINE RE SIDE)

TO INTER TRIP SEND CH1 (ICT LV SIDE)

TO M_L LBB TRIP RELAY (96 M_L CB)

TO TC-1

TO TC-2

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16


C

E

C

E

TO INTER TRIP SEND CH2(ICT LV SIDE)

86-A

86-B

50Z

TX

CB

CL

OS

EP

UL

SE

96 H

IGH

SP

EE

DM

AS

TE

R T

RIP

RE

LA

Y

TO TC-2

TO TC-1

TO TC-2M_L LBB OPTD

TO 21 L1 (DR M_L)

TO 21 L2 (DR M_T)

TO CLOSE I/L

TO BAY UNIT


M_T LBB OPTD

TO 87 T1 (DR M_L)

TO 87 T2 (DR M_T)

LBB IS PART OF DISTRIBUTED ARCHITECTURELBB IS PART OF DISTRIBUTED ARCHITECTUREMAIN CB (ICT SIDE) LBB & BUSBAR INPUT & OUTPUTSMAIN CB (ICT SIDE) LBB & BUSBAR INPUT & OUTPUTS

M_CB OPEN

M_CB CLOSE

BUS ISO OPEN

BUS ISO CLOSE

T_CB OPEN

T_CB CLOSE

TO INTERTRIP TRIP SEND CH1 (LBB OPTD)

TO INTERTRIP SEND CH2 (LBB OPTD)

TO INTERTRIP SEND CH1 (BB OPTD)

TO INTERTRIP SEND CH2 (BB OPTD)

TO TIE LBB TRIP RELAY (50ZTX/96TIE)

TO TC-1

86-A

86-B

96-A

96-B

CB

CL

OS

EP

UL

SE

96 H

IGH

SP

EE

DM

AS

TE

R T

RIP

RE

LA

Y

TO TC-2

TO TC-1

TO TC-2TIE LBB OPTD

TO 87 T1 (DR)

TO 87 T2 (DR)

TO CLOSE I/L

TO BAY UNIT

TO BCU (SOE)

LV M_LBB OPTD

LV T_LBB OPTD


186-R

186-Y

186-B

286-R

286-Y

286-B

MAIN CB (DBT SYSTEM) LBB & BUSBAR INPUT & OUTPUTSMAIN CB (DBT SYSTEM) LBB & BUSBAR INPUT & OUTPUTS

M_CB OPEN

M_CB CLOSE

BUS1 ISO OPEN

BUS1 ISO CLOSE





TO TBC LBB TRIP RELAY (96TBC)

TO TC-1

BUS2 ISO OPEN

BUS2 ISO CLOSE

BUS3 ISO OPEN

86-A

86-B

96-A

96-B

CB

CL

OS

EP

UL

SE

96 H

IGH

SP

EE

DM

AS

TE

R T

RIP

RE

LA

Y

TO TC-2

TO TC-1

TO TC-2TBC LBB OPTD

TO 21 L1 (DR)

TO 21 L2 (DR)

TO CLOSE I/L

TO BAY UNIT


BUS3 ISO CLOSE

BUS BAR PROTECTION BUS BAR PROTECTION

DISPLAY

ACTIVE START TRIP

REB 500REB 500

INITIATE ALL CBs TRIP UNITS CONNECTED TO THIS BUS AND OPERATE.

TO TRIP COIL-1 CONCERNED BAY CB


TO CLOSE CIRCUIT INTERLOCK OF CONCERN CB

DIRECT TRIP SEND CHANNEL-1 TO OTHER END


C

E

DISPLAY

REB 670REB 670


TO DISTURBANCE RECORDER OF MAIN-1




FROM LBB/BFR TO BUS BAR TRIPPING

INITIATE ALL CBs TRIP UNITS CONNECTED TO THIS BUS AND OPERATE.



C

E

DISPLAY

ACTIVE START TRIP

REB 670REB 670




TO CLOSE CIRCUIT INTERLOCK OF CONCERN CB






FROM LBB/BFR TO BUS BAR TRIPPING

BUSBARBUSBAR--1 PROTECTION TRIPPING SCHEME1 PROTECTION TRIPPING SCHEMEHIGH SPEEDHIGH SPEEDTRIP RELAYTRIP RELAY

FOR FOR

11--52 CB52 CB

TO CLOSE CKT INTERLOCKTO BLOCK A/RTO TRIP COIL-1TO TRIP COIL-2DIRECT TRIP SEND CH-1DIRECT TRIP SEND CH-2TO DISTURBENCE RECORDER

11--52 CB PANEL52 CB PANEL

TO CLOSE CKT INTERLOCKTO BLOCK A/RTO TRIP COIL-1TO TRIP COIL-2DIRECT TRIP SEND CH-1

44--52 CB PANEL52 CB PANELHIGH SPEEDHIGH SPEEDTRIP RELAYTRIP RELAY

FOR FOR

44--52 CB52 CB


TRIP FROM 50 LBB

TO START 50 LBB


TRIP FROM 50 LBB

TO START 50 LBBDIRECT TRIP SEND CH-2TO DISTURBENCE RECORDER




1010--52CB PANEL52CB PANEL


44--52 CB52 CB

HIGH SPEEDHIGH SPEEDTRIP RELAYTRIP RELAY

FOR FOR

77--52 CB52 CB


FOR FOR

1010--52 CB52 CB

TO START 50 LBB


TRIP FROM 50 LBB

TO START 50 LBB


TRIP FROM 50 LBB

TO START 50 LBB






FOR FOR

1313--52 CB52 CB


FOR FOR

1616--52 CB52 CB

TO START 50 LBB


TRIP FROM 50 LBB

TO START 50 LBB


TRIP FROM 50 LBB

TO START 50 LBB

+VE BUSBAR PANEL

BUSBARBUSBAR--2 PROTECTION TRIPPING SCHEME2 PROTECTION TRIPPING SCHEMEHIGH SPEEDHIGH SPEEDTRIP RELAYTRIP RELAY

FOR FOR

33--52 CB52 CB



TO CLOSE CKT INTERLOCKTO BLOCK A/RTO TRIP COIL-1TO TRIP COIL-2DIRECT TRIP SEND CH-1

66--52 CB PANEL52 CB PANELHIGH SPEEDHIGH SPEEDTRIP RELAYTRIP RELAY

FOR FOR

66--52 CB52 CB


TRIP FROM 50 LBB

TO START 50 LBB


TRIP FROM 50 LBB

TO START 50 LBBDIRECT TRIP SEND CH-2TO DISTURBENCE RECORDER




1212--52CB PANEL52CB PANEL


66--52 CB52 CB


FOR FOR

99--52 CB52 CB


FOR FOR

1212--52 CB52 CB

TO START 50 LBB


TRIP FROM 50 LBB

TO START 50 LBB


TRIP FROM 50 LBB

TO START 50 LBB






FOR FOR

1515--52 CB52 CB


FOR FOR

1818--52 CB52 CB

TO START 50 LBB


TRIP FROM 50 LBB

TO START 50 LBB


TRIP FROM 50 LBB

TO START 50 LBB

+VE BUSBAR PANEL

STUB PROTECTION STUB PROTECTION

ACTIVE START TRIP

REL 521REL 521INITIATE MAIN CB 86-GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

INITIATE TIE CB 86-GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

BLOCK MAIN CB AUTO RECLOSURELINE /AT/FISOLATOR


C

E

DISPLAY

REL 316REL 316





INITIATE MAIN CB 86-GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

ISOLATOR

OPENS


CLOSE INTERLOCK OF MAIN CB

C

E

DISPLAY

ACTIVE START TRIP

REL 316REL 316 INITIATE TIE CB 86-GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )









LINE /AT/FISOLATOR

OPENS

TEED PROTECTION TEED PROTECTION

ACTIVE START TRIP

RET 521RET 521INITIATE MAIN CB 86-GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )



BLOCK TIE CB AUTO RECLOSURE87 T187 T1

C

E

DISPLAY

RET 670RET 670








87 T187 T1(HZ)(HZ)

C

E

DISPLAY

ACTIVE START TRIP

RET 670RET 670 INITIATE TIE CB 86-GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )









87 T287 T2(LZ)(LZ)

MAINMAIN--1/ MAIN1/ MAIN--22OVER VOLTAGE STAGEOVER VOLTAGE STAGE--1 1

ACTIVE START TRIP

REL 521REL 521INITIATE MAIN CB 86-GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )




110% OF V4 SECS FOR

FEEDER-15 SECS FOR

C

E

DISPLAY

REL 316REL 316







5 SECS FOR FEEDER-2


C

E

DISPLAY

ACTIVE START TRIP

REL 316REL 316 INITIATE TIE CB 86-GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )








110% OF V4 SECS FOR

FEEDER-15 SECS FOR FEEDER-2


OVER VOLTAGE STAGEOVER VOLTAGE STAGE--2 2

C

DISPLAY

ACTIVE START TRIP

REU 521REU 521INITIATE MAIN CB 86-GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )







120% OF V20m SECS


C

E

REU 521REU 521


TO DISTURBANCE RECORDER (MAIN-1 & MAIN-2)


UNDER VOLTAGE RELAY UNDER VOLTAGE RELAY

C

E

DISPLAY

ACTIVE START TRIP

REU 521REU 521

LINE EARTH SWITCH CLOSE PERMISSION ONLY.1O% OF V

CARRIER TRIPPING SCHEMES(TELEPROTECTION)CARRIER TRIPPING SCHEMES(TELEPROTECTION)

DETAILSDETAILS PERMISSIVE TRIPPINGPERMISSIVE TRIPPING DIRECT TRIPPINGDIRECT TRIPPING

CHANNELCHANNEL--1 1

SENDSEND

MAINMAIN--11 PROTECTIONPROTECTION ::

IT SENDS SIGNAL PARALLEL VIA

PLCC PROTECTION COUPLER PANEL-1 AS A MAIN CHANNEL &

PLCC PROTECTION COUPLER PANEL-2 AS A ALTERNATE

CHANNEL..

HERE CHANNEL-1 & CHANNEL-2 SIGNALS ARE MAIN & ALTERNATE CHANNEL




4. MAIN CB OPEN CONDITION + 87 BUSBAR-2 OPERATEDCHANNEL..


IT SENDS SIGNAL PARALLEL VIA



CHANNEL.

4. MAIN CB OPEN CONDITION + 87 BUSBAR-2 OPERATED

(FOR HALF DIA ONLY).





9. 87 TEED-1 PROTECTION OPERATED


CHANNELCHANNEL--2 2

SENDSEND

CHANNELCHANNEL--1 1

RECEIVERECEIVE


IT RECEIVES SIGNAL PARALLEL VIA

1. TO 86-A MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR MAIN CB.

2. TO 86-A MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR TIE CB. RECEIVERECEIVE PLCC PROTECTION COUPLER PANEL-1 AS A MAIN CHANNEL &


CHANNEL.


IT RECEIVES SIGNAL PARALLEL VIA



CHANNEL.

2. TO 86-A MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR TIE CB.

CHANNELCHANNEL--2 2

RECEIVERECEIVE1. TO 86-B MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR MAIN CB.

2. TO 86-B MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR TIE CB.

CARRIER TRIPPING SCHEMES(TELEPROTECTION)CARRIER TRIPPING SCHEMES(TELEPROTECTION)

C

E


C

E

ABB Network Partner AG REL531 CARRIERPROTECTION

PANEL-1

PT SEND

PT RECEIVE

PT SEND

PT RECEIVE

CARRIERPROTECTION

PANEL-1

PT SEND

PT RECEIVE

PT SEND

PT RECEIVEDIRECT TRIP DIRECT TRIP

21 M1 – REL 521 21 M1 – REL 521

1

2

3

9

10

11


1

2

3

9

10

11


PT RECEIVE

DT SEND

DT RECEIVE

CARRIERPROTECTION

PANEL-2

PT RECEIVE

DT SEND

DT RECEIVE

CARRIERPROTECTION

PANEL-2

DIRECT TRIP SEND CH-1

MAIN CB 86-A

TIE CB 86-A


MAIN CB 86-A

TIE CB 86-A

ONE ENDONE END OTHER ENDOTHER END

21 M2REL 316

21 M2REL 316

C

E

3

4

5

6

7

8

11

12

13

14

15

16

C

E

3

4

5

6

7

8

11

12

13

14

15

16

PANEL-2

PT SEND

PT RECEIVE

PT SEND

PT RECEIVE

DT SEND

DT RECEIVE

PANEL-2

PT SEND

PT RECEIVE

PT SEND

PT RECEIVE

DT SEND

DT RECEIVE


MAIN CB 86-B

TIE CB 86-B


MAIN CB 86-B

TIE CB 86-B PT : PERMISSIVE PROTECTION TRANSFER TRIPDT : DIRECT TRANSFER TRIP

DIRECT TRANSFER TRIP DIRECT TRANSFER TRIP CHANNEL CHANNEL –– 1 / 2 RECEIVED 1 / 2 RECEIVED

ACTIVE START TRIP

85 LO X185 LO X1INITIATE MAIN CB 86-GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )


BLOCK MAIN CB AUTO RECLOSUREDIRECT TRIP CHANNEL-1


C

E

DISPLAY

85 LO X285 LO X2






CHANNEL-1

RECEIVED



C

E

DISPLAY

ACTIVE START TRIP

85 LO X285 LO X2 INITIATE TIE CB 86-GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )






DIRECT TRIPCHANNEL-2

RECEIVED.




TRANSFORMER PROTECTION TRANSFORMER PROTECTION ( OVER FLUX PROTECTION FOR HV & LV)( OVER FLUX PROTECTION FOR HV & LV)

ACTIVE START TRIP

RALKRALKINITIATE 400KV MAIN CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )


99T HV99T HVINITIATE 220KV MAIN CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )


C

E

DISPLAY

RATUBRATUB




99T HV99T HV


C

E

DISPLAY

ACTIVE START TRIP

RATUBRATUB




99T LV99T LV




TRANSFORMER PROTECTIONTRANSFORMER PROTECTION

ACTIVE START TRIP

RXIG 21RXIG 21INITIATE 400KV MAIN CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )


51 O/L51 O/LINITIATE 220KV MAIN CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )


C

E

DISPLAY

RAEDK1RAEDK1




51 O/L51 O/L


C

E

DISPLAY

ACTIVE START TRIP

RAEDK1RAEDK1




NDRNDR




OVER VOLTAGE (LINE) AND OVER FLUX(ICT ) OVER VOLTAGE (LINE) AND OVER FLUX(ICT ) PROTECTION TRIP SCHEMEPROTECTION TRIP SCHEME




ABBABB

O/V O/V –– 11

O/V O/V –– 22

ABBABBRALKRALK

O/FO/F-- HVHV

(BAY 1&2) (BAY 2&3 / HV)

BUS-1 BUS-2

1-52CB 3-52CB2-52CB

ABBABBREL521REL521MAINMAIN--11

8686--BBMTR/MTR/HSTRHSTR



ABBABBO/V O/V –– 11

O/V O/V –– 22



(BAY 1&2)

ABBABBRATUBRATUBO/FO/F-- LVLV

(BAY LV)

LV - CB8686--BBMTR/MTR/HSTRHSTR


TRIP COIL-2 TRIP COIL-1

OVER VOLTAGE STAGE-1 & STAGE-2 ARE IN BUILT FUNCTIONS OF MAIN-1

& MAIN-2 LINE DISTANCE RELAYS.

HV OVER FLUX IS INBUILT FUNCTION OF MAIN-1 ICT DIFFERENTIAL RELAYLV OVER FLUX IS INBUILT FUNCTION OF MAIN-2 ICT DIFFERENTIAL RELAY

8686--GA & 86 GB MASTER TRIP / HIGH SPEED GA & 86 GB MASTER TRIP / HIGH SPEED TRIP LOCKOUT RELAY OPERATIONTRIP LOCKOUT RELAY OPERATION

8686--GAGAMASTERMASTER

TRIP /TRIP /HIGH HIGH



2

M

AIN

CB

T

RIP

CO

IL

2

M

AIN

CB

T

RIP

CO

IL --

11T

RIP

CO

ILT

RIP

CO

IL

OVER VOLTAGE STAGE-1

(INBUILT MAIN-1)

DIRECT TRIP CHANNEL-1

RECEIVED

SOTF PROTECTION

8686--GBGBMASTERMASTER

HIGH HIGH SPEEDSPEEDTRIPTRIP

RELAYRELAY



RELAYRELAY

2

M

AIN

CB

T

RIP

CO

IL

2

M

AIN

CB

T

RIP

CO

IL

TR

IP C

OIL

TR

IP C

OIL

--1 T

IE C

B T

RIP

CO

IL

1 T

IE C

B T

RIP

CO

IL


( IN BUILT MAIN-2 )

DIRECT TRIP CHANNEL-2

RECEIVED

SOTF PROTECTION

(INBUILT MAIN-1)

SOTF PROTECTION

DEF,TOC, BOC, STUB

(INBUILT MAIN-1)

TEED-1 PROTECTION

MASTERMASTERTRIP /TRIP /HIGH HIGH

SPEEDSPEEDTRIPTRIP

RELAYRELAY


SPEEDSPEEDTRIPTRIP

RELAYRELAY

TR

IP C

OIL

TR

IP C

OIL

--2

M

AIN

CB

T

RIP

CO

IL

2

M

AIN

CB

T

RIP

CO

IL

1 T

IE C

B T

RIP

CO

IL

1 T

IE C

B T

RIP

CO

IL --22

SOTF PROTECTION

( IN BUILT MAIN-2 )


DEF, TOC, BOC, STUB

( IN BUILT MAIN-2 )

MAIN LBB OPERATED

TIE LBB OPERATED

TEED-2 PROTECTION

8686--GA & 86 GB MASTER TRIP / HIGH SPEED GA & 86 GB MASTER TRIP / HIGH SPEED TRIP LOCKOUT RELAY OPERATIONTRIP LOCKOUT RELAY OPERATION





2

M

AIN

CB

T

RIP

CO

IL

2

M

AIN

CB

T

RIP

CO

IL --

11T

RIP

CO

ILT

RIP

CO

IL

T/F DIFFERENTIAL RELAY

87 T

B/U O/C & E/F PROTN RLY

67 ABCN

INTER TRIP FROM LV SIDE



RELAYRELAY



RELAYRELAY

2

M

AIN

CB

T

RIP

CO

IL

2

M

AIN

CB

T

RIP

CO

IL

TR

IP C

OIL

TR

IP C

OIL

--1 T

IE C

B T

RIP

CO

IL

1 T

IE C

B T

RIP

CO

IL

RESTRICTED EARTH FAULT

RELAY 64 REF/T



ICT TROUBLES GR-B

ICT TROUBLES GR-A

PROTECTION TRIP

ICT HV OVER FLUX RELAY


SPEEDSPEEDTRIPTRIP

RELAYRELAY


SPEEDSPEEDTRIPTRIP

RELAYRELAY

TR

IP C

OIL

TR

IP C

OIL

--2

M

AIN

CB

T

RIP

CO

IL

2

M

AIN

CB

T

RIP

CO

IL

1 T

IE C

B T

RIP

CO

IL

1 T

IE C

B T

RIP

CO

IL --22

ICT TROUBLES GR-B

PROTECTION TRIP

STUB RELAY 50ST

MAIN LBB OPERATED

TIE LBB OPERATED

ICT LV OVER FLUX RELAY

INTER TRIP FROM TBC LBB

& MANUAL TRIP OF 220KV

MASTER TRIP RELAYS MASTER TRIP RELAYS HIGH SPEED TRIP RELAYSHIGH SPEED TRIP RELAYS

LOCKOUT RELAYSLOCKOUT RELAYS


PUSH BUTTON FOR RESETTING.TO CLOSING INTERLOCK OF CONCERNED BAY CB

TO INITIATE LBB/BFR OF CONCERNED BAY

BLOCK AUTO RECLOSURE OF CONCERNED BAY

8686--GBGB


SPEEDSPEEDTRIPTRIP

RELAYRELAYTO EVENT RECORDER ( SOE/ SCADA )


INITIATE FLAG RELAY (FLAG RELAY OPERATES)





PUSH BUTTON FOR RESETTING.


TO CLOSING INTERLOCK OF CONCERNED BAY CB



SPEEDSPEEDTRIPTRIP

RELAYRELAY




INITIATE FLAG RELAY (FLAG RELAY OPERATES)





AUTO TRANSFORMER INTER TRIP CIRCUITSAUTO TRANSFORMER INTER TRIP CIRCUITSHV INTER TRIP CIRCUITS(TO LV)HV INTER TRIP CIRCUITS(TO LV) LV INTER TRIP CIRCUIT(TO HV)LV INTER TRIP CIRCUIT(TO HV)

FOR LV MASTER TRIP RELAY 86 GR-A

1. TIE CB OPEN CONDITION + MAIN CB REMOTE HAND TRIP

GIVEN.

2. MAIN CB OPEN CONDITION + TIE CB REMOTE HAND TRIP

GIVEN.



FOR HV M-CB MASTER TRIP RELAY 86 GR-A

1. LV CB REMOTE HAND TRIP GIVEN.

2. LV 87 BB(96) BUSBAR-1/2 (ISO SELECTION)

OPERATED.

3. LV CB 50 LBB/BFR OPERATED.






8. 87 TEED-2 PROTECTION OPERATED.

FOR LV MASTER TRIP RELAY 86 GR-B

1. TIE CB OPEN CONDITION + MAIN CB REMOTE HAND TRIP

GIVEN.

2. MAIN CB OPEN CONDITION + TIE CB REMOTE HAND TRIP

FOR HV M-CB MASTER TRIP RELAY 86 GR-B



OPERATED.


FOR HV T-CB MASTER TRIP RELAY 86 GR-A


2. LV 87 BB(96) BUSBAR-1/2 (ISO SELECTION) 2. MAIN CB OPEN CONDITION + TIE CB REMOTE HAND TRIP

GIVEN.







8. 87 TEED-2 PROTECTION OPERATED.


OPERATED.


FOR HV T-CB MASTER TRIP RELAY 86 GR-B



OPERATED.


TRANSFORMER TROUBLES TRIPPING TRANSFORMER TROUBLES TRIPPING GRGR--AA

OIL TEMP TRIP

86 AX

TO 3PH GR-A 400KV MAIN CB

BUCHHOLZ TRIP

PRD-1 TRIP

PRD-2 TRIP

DIFF RELAY 87T

OL RELAY 51OL

HV O/L+E/F PROT 6786 AY

TO 3PH GR-A 400KV TIE CB

TO 3PH GR-A 220KV MAIN CB

TO 3PH GR-A 220KV TBC CB

NDR RELAY 151N

HV O/F RELAY 99T

TRANSFORMER TROUBLES TRIPPING TRANSFORMER TROUBLES TRIPPING GRGR--BB

86 BX

TO 3PH GR-B 400KV MAIN CBOLTC BUCHHOLZ-R TRIP

REF RELAY 64REF

STUB RELAY 50ST

LV O/L+E/F PROT 6786 BY

TO 3PH GR-B 400KV TIE CB

TO 3PH GR-B 220KV MAIN CB

TO 3PH GR-B 220KV TBC CBOLTC BUCHHOLZ-Y TRIP

OLTC BUCHHOLZ –B TRIP

WNDG TEMP-HV TRIP

LV O/F RELAY 99TWNDG TEMP-LV TRIP

WNDG TEMP-IV TRIP

186R1

186R2

286R1

186Y1

186Y2

286Y1

186B1

186B2

286B1

186R1, 186R2, 186Y1, 186Y2, 186B1, 186B2 ARE CB 1-PH TRIP UNIT OF GR-A. THESE

ARE SELF RESETING.

TRIP COIL-1

TRIP COILTRIP COIL--1 CIRCUITS1 CIRCUITS

.

286R1

286R2

86GR-A

86GR-B

.

286Y1

286Y2

286B1

286B2

.

ARE SELF RESETING.286R1, 286R2, 286Y1, 286Y2, 286B1, 286B2 ARE CB 1-PH TRIP UNIT OF GR-B. THESE ARE SELF RESETING.THE BELOW ARE HAND RESETING.86GR-A, 86GR-B ARE 3-PH TRIP UNITS.

96 BB IS BUSBAR TRIPPING RELAY

.86GR-B

96BB

..

186R1

186R2

286R1

186Y1

186Y2

286Y1

186B1

186B2

286B1

186R1, 186R2, 186Y1, 186Y2, 186B1, 186B2 ARE CB 1-PH TRIP UNIT OF GR-A. THESE

ARE SELF RESETING.

TRIP COIL-2

TRIP COIL TRIP COIL –– 2 CIRCUITS2 CIRCUITS

.

286R1

286R2

86GR-A

86GR-B

.

286Y1

286Y2

286B1

286B2

.

ARE SELF RESETING.286R1, 286R2, 286Y1, 286Y2, 286B1, 286B2 ARE CB 1-PH TRIP UNIT OF GR-B. THESE ARE SELF RESETING.THE BELOW ARE HAND RESETING.86GR-A, 86GR-B ARE 3-PH TRIP UNITS.

96 BB IS BUSBAR TRIPPING RELAY

.86GR-B

96BB

..

ISOLATOR ISOLATOR

INTERLOCKSINTERLOCKSS.NOS.NO

ISOLATORISOLATOR

OPEN/CLOSEOPEN/CLOSE

EQUIPMENTEQUIPMENT--11 EQUIPMENTEQUIPMENT--22 EQUIPMENTEQUIPMENT--33 EQUIPMENTEQUIPMENT--44

INTERLOCKS REQUIRED FOR CONCERNED ISOLATOR / EARTH SWITCH OPEN OR CLOSEINTERLOCKS REQUIRED FOR CONCERNED ISOLATOR / EARTH SWITCH OPEN OR CLOSE

BAY BAY -- 11

11 1 1 -- 8989 ISOISO BB189 EBB189 E OO 189 AE189 AE OO 189 E189 E OO 152 CB152 CB OO

22 1 1 –– 89 E89 E ESES 189 A189 A OO 189189 OO ---- -- ---- --

33 1 1 –– 89 A89 A ISOISO 189 AE189 AE OO 189 E189 E OO 152 CB152 CB OO ---- --

44 1 1 –– 89 AE89 AE ESES 189 A189 A OO 189189 OO ---- -- ---- --

55 1 1 –– 89 L89 L ISOISO 189 LE189 LE OO 152 CB152 CB OO 252 CB252 CB OO ---- --

66 1 1 –– 89 LE89 LE ESES 189 L189 L OO UV RELAYUV RELAY AA ---- -- ---- --

BAY BAY -- 22

77 2 2 –– 89 A89 A ISOISO 289 BE289 BE OO 289 AE289 AE OO 252 CB252 CB OO ---- --

88 2 2 –– 89 AE89 AE ESES 289 B289 B OO 289 A289 A OO ---- -- ---- --

99 2 2 –– 89 B89 B ISOISO 289 BE289 BE OO 289 AE289 AE OO 252 CB252 CB OO ---- --

1010 2 2 –– 89 BE89 BE ESES 289 B289 B OO 289 A289 A OO ---- -- ---- --

NOTE:NOTE: All Earth Switches All Earth Switches

in the Bay are towards in the Bay are towards

Circuit Breaker side only. Circuit Breaker side only.

The Line and Transformer The Line and Transformer

Earth Switches are towards Earth Switches are towards

Line & Transformer.Line & Transformer.

BAY BAY -- 33

1111 3 3 –– 89 89 ISOISO BB289 EBB289 E OO 389 AE389 AE OO 389 E389 E OO 352 CB352 CB OO

1212 3 3 –– 89 E89 E ESES 389 A389 A OO 389389 OO ---- -- ---- --

1313 3 3 –– 89 A89 A ISOISO 389 AE389 AE OO 389 E389 E OO 352 CB352 CB OO ---- --

1414 3 3 –– 89 AE89 AE ESES 389 A389 A OO 389389 OO ---- -- ---- --

1515 3 3 –– 89 T89 T ISOISO LV89 E2LV89 E2 OO 389 TE389 TE OO 252 CB252 CB OO 352 CB352 CB OO

1616 3 3 –– 89 TE89 TE ESES 389 T389 T OO LV89 TLV89 T OO ---- -- ---- --

O: OPENO: OPEN

C: CLOSEC: CLOSE

A: ACTEDA: ACTED

BB189E : BUSBARBB189E : BUSBAR--1 EARTH SWITCH .1 EARTH SWITCH .

BB289E : BUSBARBB289E : BUSBAR--2EARTH SWITCH . 2EARTH SWITCH .

UV RELAY: UNDER VOLTAGE RELAY.UV RELAY: UNDER VOLTAGE RELAY.

ISOLATOR & CB INTERLOCKSISOLATOR & CB INTERLOCKS

1-52CB

&

OPEN

OPEN

OPEN

OPERATION1-89AE

1-89E

1-89A

&

BB189EOPEN

OPEN1-89AE

1-89EOPEN

OPEN

1-89OPERATION

1-52CB

&OPERATION

OPEN

OPEN

OPEN

OPEN

BB289E

3-89AE

3-89E

3-52CB

3-89

3-52CB

3-89AE&

OPEN

OPEN

OPEN3-89E

OPERATION3-89A

CLOSE &CLOSE

1-89E

1-89AE

LOCAL

CLOSE

1-52CB

CLOSE &CLOSE

2-89AE

2-89BE

LOCAL

CLOSE

2-52CB

&CLOSE

3-89ELOCAL

CLOSE

1-52CB

&

OPEN

OPEN

OPEN

OPERATION1-89LE

2-52CB

1-89L

&1-89

OPEN

OPEN1-89A

1-89EOPERATION

OPEN

&1-89

OPEN 1-89AEOPERATION

3-89E

2-52CB&

OPEN

OPEN

OPEN

3-52CB

3-89TEOPERATION3-89T

OPENLV89E2

OPEN

OPEN&3-89

3-89A

OPERATION3-89E

OPEN

OPEN&3-89

OPERATION

CLOSE &3-89E

3-89AE

CLOSE

3-52CB

RESET &

RESET86GR-A

86GR-B

REMOTE

CLOSE

1-52CBRESET96BB

RESET &RESET

86GR-A

86GR-B

REMOTE

CLOSE

2-52CB

RESET86GR-A

2-52CB

&

OPEN

OPEN

OPEN

OPERATION2-89AE

2-89BE2-89A

&OPEN1-89A

1-89AE

&1-89L

OPEN

ACTEDU/V RLY

1-89LEOPERATION

OPEN&3-89A

OPERATION3-89AE

OPEN

OPEN&OPERATION

3-89TE3-89T

LV89T

OPEN &OPEN

2-89A

2-89B

OPERATION

2-89AE

OPEN

OPEN &2-89A

2-89B

OPERATION

2-89BE

2-52CB

&

OPEN

OPEN

OPEN

OPERATION2-89AE

2-89BE2-89B

RESET &

RESET86GR-A

86GR-B

REMOTE

CLOSE

3-52CBRESET96BB

CLOSING INTERLOCK OF MAIN & TIE CBCLOSING INTERLOCK OF MAIN & TIE CB

86 GR86 GR--A A 96 BB 96 BB 86 GR86 GR--B B

T N CT N C

+ VE+ VE

CB REMOTE CLOSECB REMOTE CLOSE+ve+ve --veve

SYN SOCKETSYN SOCKET

CB REMOTE CLOSECB REMOTE CLOSE

MAIN CBMAIN CB21M1 AR21M1 AR

21M2 AR21M2 AR

86 GR86 GR--A A 86 GR86 GR--B B

CB AUTO RECLOSECB AUTO RECLOSE

+ve+ve --veve

T N CT N C

+ VE+ VE

TIE CBTIE CBTIE ARTIE AR

CB REMOTE CLOSECB REMOTE CLOSE

CB AUTO RECLOSECB AUTO RECLOSE

+ve+ve --veve

SYN SOCKETSYN SOCKET

OTHER OTHER INFORMATION INFORMATION REGARDING REGARDING REGARDING REGARDING RELAYS AND RELAYS AND

TESTING TESTING TESTING TESTING EQUIPMENTEQUIPMENT


ADE/MRT(PROTECTION)

ABB RELAYSABB RELAYS

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

ABB Network Partner AG REL 316*4ABB Network Partner AG

ABB Network Partner AG REL 521

C

E

C

E

C

E


REL 512ABB Relays

c

E

AREVA RELAYSAREVA RELAYS

P443 P445

P437 P442E-PAC

GE MULTILINGE MULTILINRELAYSRELAYS

B90 – 87BB

C60 – BCU

D60 – 21L

D90 – 21L

L60 – 87L

L90 – 87L

T60 – 87T

D25 – BCU

F90 – 67/51

G60 – GEN

M60 – MOTOR

N90 – NETWORKD90 – 21L D25 – BCU N90 – NETWORK

SIEMENS RELAYSSIEMENS RELAYS

IA =250.10 A

IB =250.10 A

ENABLED

TRIPTARGET RESET

INSTINSTINSTINST PH PH PH PH ---- AAAA

SPT

ENABLEDMC

ENABLED SEL- 421PROTECTION

SEL RELAYSSEL RELAYS

IB =250.10 A

IC =250.10 A

VAB =400.0 KV

VBC =400.0 KV

VCA =400.0 KV

ESC ENT

INSTINSTINSTINST

TIMETIMETIMETIME

COMMCOMMCOMMCOMM

SOTFSOTFSOTFSOTF

ZONE 1ZONE 1ZONE 1ZONE 1




PH PH PH PH ---- AAAA

PH PH PH PH ---- BBBB

PH PH PH PH ---- CCCC

GNDGNDGNDGND

5051

79 RESET

79 LOCKOUT

COMM

ENABLED

RECLOSE

ENABLED

ALT

SETTINGS

CB

CLOSED

RELAY

TEST

CB

OPEN

AUTOMATION

CONTROL

SEL

ENABLEDTARGET

INST TIME COMM SOTF SEL- 321- 5 - 21 2 3 4

TRIPTARGET RESET PROTECTION

AUTOMATION

CONTROL

SEL

TRIP ZONE

EN A B C G Q 51 50

FAULT TYPE O/C

TARGET

RESET

TARGET FAULT SET METER STATUS OTHER GROUP

NO /

CANCEL

YES /

SELECTEXIT

VA TECH REYROLLE RELAYSVA TECH REYROLLE RELAYS

ERL PHASE RELAYSERL PHASE RELAYS

RELAY HARDWARERELAY HARDWARE

16 / 32 BIT

PCMODEM

NORMALLY 400KV RELAYS SUPPLIED WITH FOLLOWINGCONFIGUARATION/HARDWARE

1. MIN 4Nos MAX 8Nos COMMAND/TRIP OUTPUTS

2. MIN 24Nos SIGNAL OUTPUTS3. MIN 14 LED INDICATIONS4. MIN 24 BINARY INPUTS

IRIG-BRE/CC

RELAY SIGNAL DATA FLOWRELAY SIGNAL DATA FLOW

FUNCTIONS AVAILABLE NUMERICAL DISTANCE RELAYSFUNCTIONS AVAILABLE NUMERICAL DISTANCE RELAYS1.1. 4 TO 6 SETTING IMPEDENCE ZONES WITH 4 TO 6 SETTING GROUPS (21 + 21N).4 TO 6 SETTING IMPEDENCE ZONES WITH 4 TO 6 SETTING GROUPS (21 + 21N).2.2. DIR / INST / TIME OVERCURRENT & EARTH FAULT FUNCTION( 50 / 51 / 67 P+G).DIR / INST / TIME OVERCURRENT & EARTH FAULT FUNCTION( 50 / 51 / 67 P+G).3.3. EIGHT COMMUNICATION SCHEMES.EIGHT COMMUNICATION SCHEMES.4.4. SWITCH ON TO FAULT PROTECTION(21 SOTF).SWITCH ON TO FAULT PROTECTION(21 SOTF).5.5. PHASE SELECTION(R,Y,B).PHASE SELECTION(R,Y,B).6.6. POWER SWING BLOCKING(PSB)(68 + 68T).POWER SWING BLOCKING(PSB)(68 + 68T).7.7. FUSE FAILURE SUPERVISION(PT FFR).FUSE FAILURE SUPERVISION(PT FFR).

8.8. AUTO RECLOSER WITH CHECK SYNCHRNISATIONAUTO RECLOSER WITH CHECK SYNCHRNISATION & VOLTAGE CHECK(79 + 25 +86). & VOLTAGE CHECK(79 + 25 +86). 8.8. AUTO RECLOSER WITH CHECK SYNCHRNISATIONAUTO RECLOSER WITH CHECK SYNCHRNISATION & VOLTAGE CHECK(79 + 25 +86). & VOLTAGE CHECK(79 + 25 +86).

9.9. WEEK END INFEED LOGIC(27 WI).WEEK END INFEED LOGIC(27 WI).10.10. SYSTEM SUPERVISION.SYSTEM SUPERVISION.11.11. STUB PROTECTION(STUB).STUB PROTECTION(STUB).12.12. OVER VOLTAGE/ UNDER VOLTAGE FUNCTION(27+ 59).OVER VOLTAGE/ UNDER VOLTAGE FUNCTION(27+ 59).13.13. LBB/BFR FUNCTION(50 BF).LBB/BFR FUNCTION(50 BF).14.14. DISTANCE TO FAULT LOCATOR(21 FL).(SHOWS IN 1. %, 2. KM 3. MILES & 4. R+JX )DISTANCE TO FAULT LOCATOR(21 FL).(SHOWS IN 1. %, 2. KM 3. MILES & 4. R+JX )15.15. 16 PROGRAMABLE SIGNALLING RELAYS WITH LEDs.16 PROGRAMABLE SIGNALLING RELAYS WITH LEDs.16.16. RECORDABLE 10Nos LATEST DISTRUBANCES WITH BASIC EVALUATION RECORDABLE 10Nos LATEST DISTRUBANCES WITH BASIC EVALUATION

DISTURBANCE RECORDER.DISTURBANCE RECORDER.17.17. EVENT RECORDER RELATED TO RELAY EVENTS.EVENT RECORDER RELATED TO RELAY EVENTS.17.17. EVENT RECORDER RELATED TO RELAY EVENTS.EVENT RECORDER RELATED TO RELAY EVENTS.18.18. PREPRE--FAULT, FAULT & POSTFAULT, FAULT & POST--FAULT VALUES OF ANALOG POINTS WITH IMPEDENCE FAULT VALUES OF ANALOG POINTS WITH IMPEDENCE

DETAILS.DETAILS.19.19. USER CAN BE CONFIGUARED PROGRAMABLE LOGIC FUNCTIONS.USER CAN BE CONFIGUARED PROGRAMABLE LOGIC FUNCTIONS.20.20. TELE / CARRIER INTER TRIPPING SCHEMES(85 +21)(PUTT, POTT).TELE / CARRIER INTER TRIPPING SCHEMES(85 +21)(PUTT, POTT).21.21. TRIP CIRCUIT MONITORING(74 TC).TRIP CIRCUIT MONITORING(74 TC).22.22. METERING FUNCTION (INSTANTANEOUS VALUES DISPLAY FUNCTION).METERING FUNCTION (INSTANTANEOUS VALUES DISPLAY FUNCTION).23.23. 4 QUADRANT ENERGY METER FUNCTION (KWH,KVAH,KVARH)(KYZ PULSE OUTPUT).4 QUADRANT ENERGY METER FUNCTION (KWH,KVAH,KVARH)(KYZ PULSE OUTPUT).24.24. MINIMUM 8 COMMOND/ TRIP RELAYS, 24 SIGNAL RELAYSMINIMUM 8 COMMOND/ TRIP RELAYS, 24 SIGNAL RELAYS25.25. MINIMUM 20 BINARY INPUTS, 14 LEDsMINIMUM 20 BINARY INPUTS, 14 LEDs

DISTANCE RELAYS CHARACTERESTICSDISTANCE RELAYS CHARACTERESTICS( MHO CIRCULAR )( MHO CIRCULAR )

DISTANCE RELAYS CHARACTERESTICSDISTANCE RELAYS CHARACTERESTICS( QUADRILATERAL( QUADRILATERAL--1 )1 )

DISTANCE RELAYS CHARACTERESTICSDISTANCE RELAYS CHARACTERESTICS( QUADRILATERAL( QUADRILATERAL--2 )2 )

DISTANCE RELAYS CHARACTERESTICSDISTANCE RELAYS CHARACTERESTICS( BULLET )( BULLET )

DISTANCE RELAYS CHARACTERESTICSDISTANCE RELAYS CHARACTERESTICS( TRIANGLER )( TRIANGLER )

DISTANCE RELAYS CHARACTERESTICSDISTANCE RELAYS CHARACTERESTICS( LENS / OPTICAL )( LENS / OPTICAL )

DISTANCE RELAYS CHARACTERESTICSDISTANCE RELAYS CHARACTERESTICS( TOMATO )( TOMATO )

DISTANCE RELAYS CHARACTERESTICSDISTANCE RELAYS CHARACTERESTICS( PEANUT )( PEANUT )

RELAY MODELS OF LINE (DISTANCE) & TRANSFORMER( M & B ) OF DIFFERENT MANUFACTURERSRELAY MODELS OF LINE (DISTANCE) & TRANSFORMER( M & B ) OF DIFFERENT MANUFACTURERS

MANUFACTURERSMANUFACTURERSTRANSMISSION LINE PROTECTIONTRANSMISSION LINE PROTECTION T/F PROTECTIONT/F PROTECTION

MAINMAIN--1 (21)1 (21) CURVESCURVES MAINMAIN--2 (87)2 (87) CURVESCURVES DIFFERENTIALDIFFERENTIAL DIR O/L,E/FDIR O/L,E/F

ABBABB REL 670REL 670QUAD/ QUAD/ QUAD/ QUAD/ QUAD/ QUAD/ QUAD/ QUAD/

mhomhomhomhomhomhomhomho RED 670RED 670 QUADQUADQUADQUADQUADQUADQUADQUAD RET 670RET 670 REF 6XXREF 6XXABBABB REL 670REL 670 mhomhomhomhomhomhomhomho RED 670RED 670 QUADQUADQUADQUADQUADQUADQUADQUAD RET 670RET 670 REF 6XXREF 6XX

ALSTOMALSTOM

(AREVA)(AREVA)MICOM MICOM

P446/P443P446/P443

QUAD/ QUAD/ QUAD/ QUAD/ QUAD/ QUAD/ QUAD/ QUAD/

MHOMHOMHOMHOMHOMHOMHOMHO MICOM P545MICOM P545QUAD/ QUAD/ QUAD/ QUAD/ QUAD/ QUAD/ QUAD/ QUAD/

MHOMHOMHOMHOMHOMHOMHOMHO

MICOM P633 MICOM P633

MICOM P643MICOM P643MICOM P141MICOM P141

SIEMENS SIEMENS

( SIPROTEC )( SIPROTEC )

SIPROTECSIPROTEC

7SA5227SA522



SIPROTECSIPROTEC

7SD5327SD532



7UT 613/ 2 7UT 613/ 2

7UT 513/ 2 7UT 513/ 2

7SJ 62/3/4/5 7SJ 62/3/4/5

7SJ 52/3/4/57SJ 52/3/4/5

VA TECHVA TECH

REYROLLREYROLLOHMEGA 402OHMEGA 402



OHMEGA OHMEGA

311/308311/308

QUAD/ QUAD/

MHOMHODUOBIAS MDUOBIAS M ARGUSARGUS

REYROLLREYROLL MHOMHOMHOMHOMHOMHOMHOMHO 311/308311/308 MHOMHO

GE GE

MULTILINMULTILINDD--60, 60,

DD--90 PLUS90 PLUS


MHOMHOMHOMHOMHOMHOMHOMHO LL--60/L60/L--9090QUAD/ QUAD/ QUAD/ QUAD/ QUAD/ QUAD/ QUAD/ QUAD/

MHOMHOMHOMHOMHOMHOMHOMHO TT--35 / T35 / T--60 60 FF--60 60

SELSEL SEL 421SEL 421 MHOMHOMHOMHOMHOMHOMHOMHO SEL 487LSEL 487L MHOMHOMHOMHOMHOMHOMHOMHO SEL 487TSEL 487T SEL 351SEL 351

ERL ERL

PHASEPHASELL--PROPRO


MHOMHOMHOMHOMHOMHOMHOMHO LL--PROPROLENS/ LENS/

TOMAT0TOMAT0TT--PROPRO FF--PROPRO

IEC 61850 RELAY MODELS OF DIFFERENT MANUFACTURERSIEC 61850 RELAY MODELS OF DIFFERENT MANUFACTURERS

MANUFACTURERSMANUFACTURERSBCUBCUBCUBCU

CB CONTROLCB CONTROLCB CONTROLCB CONTROL

FEEDERFEEDERFEEDERFEEDER

67676767

DISTANCEDISTANCEDISTANCEDISTANCE

21212121

LINE LINE LINE LINE

DIFFERENTIALDIFFERENTIALDIFFERENTIALDIFFERENTIAL

87 L87 L87 L87 L

DIFFERENTIALDIFFERENTIALDIFFERENTIALDIFFERENTIAL

87 T87 T87 T87 T

BUSBARBUSBARBUSBARBUSBAR

87 BB87 BB87 BB87 BB

ABBABB REC 670 REX 610 REL 670 RED 670 RET 670REB 670

REB 500ABBABB REC 670 REX 610 REL 670 RED 670 RET 670

REB 500

AREVAAREVAMICOM

C264

MICOM

P141MICOM

P44 2/3/4

MICOM

P543/547

MICOM

P633/P643

MICOM

P74 1/3/6

GE GE MULTILINMULTILIN

D 25

C 90 PLUSF 60 D 60, D 90 L 60, L 90 T 60 B 90, B 30

SIEMENS SIEMENS ( SIPROTEC )( SIPROTEC )

SIPROTEC6MD66/3

SIPROTEC7SJ 62/3/4

SIPROTEC7SA 522/6..

SIPROTEC7SD 532/61_

SIPROTEC7UT 633/13/2

SIPROTEC 7 SS 52( SIPROTEC )( SIPROTEC ) 6MD66/3 7SJ 62/3/4 7SA 522/6.. 7SD 532/61_ 7UT 633/13/2 7 SS 52

SELSELSEL

451-4

SEL

451

SEL

421/321

SEL

387L

SEL

487E

SEL

487B

TOSHIBATOSHIBAGBU

100/150GRD 140

GRZ

100/150

GRL

100 / 150

GRT

100/150

GRB

100/150

RELAY TESTING EQUIPMENTSRELAY TESTING EQUIPMENTS1. PROGRAMA_GE (MODEL: FREEJA1. PROGRAMA_GE (MODEL: FREEJA--300) 2. MANTA TEST SYSTEMS (MODEL: MTS 4000)300) 2. MANTA TEST SYSTEMS (MODEL: MTS 4000)3. OMICRON (MODEL: CMC 2563. OMICRON (MODEL: CMC 256--6)6) 4. DOBLE ( MODEL: F 6150)4. DOBLE ( MODEL: F 6150)

RELAY TESTING EQUIPMENTSRELAY TESTING EQUIPMENTS1. MEEGER_AVO (MODEL: MPRT 8430) 1. MEEGER_AVO (MODEL: MPRT 8430) 2. RES (MODEL: APTS 3)2. RES (MODEL: APTS 3)3. KOCOS (MODEL: ARTES 440 II) 3. KOCOS (MODEL: ARTES 440 II) 4. EURO SMC ( MODEL: TRES)4. EURO SMC ( MODEL: TRES)

400KV SUBSTATIONS IN APTRANSCO400KV SUBSTATIONS IN APTRANSCO

S.NoS.No 400KV SUBSTATION400KV SUBSTATION CAPACITYCAPACITY FEEDERSFEEDERS

1.1. MAMIDIPALLY (HYDERABAD)MAMIDIPALLY (HYDERABAD) 3 X 315 MVA3 X 315 MVA1. SRISAILAM 11. SRISAILAM 12. GHANAPUR (PGCIL)2. GHANAPUR (PGCIL)

3. KHAMMAM 1&2(PGCIL)3. KHAMMAM 1&2(PGCIL)4. YEDDUMAILARAM**4. YEDDUMAILARAM**

2.2. NURNOOR (KURNOOL)NURNOOR (KURNOOL) (2 + 1**) X (2 + 1**) X 315 MVA315 MVA

1. SRISAILAM1. SRISAILAM2. GHANAPUR (PGCIL)2. GHANAPUR (PGCIL)

3. GOOTY (PGCIL)3. GOOTY (PGCIL)4. KURNOOL**(PGCIL765)4. KURNOOL**(PGCIL765)

3.3. KALAPAKA (VISHAKHAPATNAM)KALAPAKA (VISHAKHAPATNAM) 2 X 315 MVA2 X 315 MVA1. SIMHADRI 1,2,3&4 (NTPC)1. SIMHADRI 1,2,3&4 (NTPC)2. GAJUWAKA 1&2 (PGCIL)2. GAJUWAKA 1&2 (PGCIL)

3. KHAMMAM 1&2 (PGCIL)3. KHAMMAM 1&2 (PGCIL)4. VEMAGIRI 1&24. VEMAGIRI 1&2

1. KALAPAKA 1&21. KALAPAKA 1&2 5. GVK EXTN 1&2 (IPP)5. GVK EXTN 1&2 (IPP)

4.4. VEMAGIRI (RAJHAMUNDRY)VEMAGIRI (RAJHAMUNDRY) 2 X 315 MVA2 X 315 MVA

1. KALAPAKA 1&21. KALAPAKA 1&22. GAJUWAKA 1&2 (PGCIL)2. GAJUWAKA 1&2 (PGCIL)3. NUNNA 1&2 (PGCIL)3. NUNNA 1&2 (PGCIL)4. NUNNA 3&4 (NRPT** 1&2)4. NUNNA 3&4 (NRPT** 1&2)

5. GVK EXTN 1&2 (IPP)5. GVK EXTN 1&2 (IPP)6. GOWTHAMI 1&2 (IPP)6. GOWTHAMI 1&2 (IPP)7. KONASEEMA 1&2 (IPP)7. KONASEEMA 1&2 (IPP)8. GMR VASAVI 1&2 (IPP)8. GMR VASAVI 1&2 (IPP)

5. 5. VELTUR (MB NAGAR)VELTUR (MB NAGAR) 3 X 315 MVA3 X 315 MVA1. TALLAPALLY1. TALLAPALLY 2. RAICHUR2. RAICHUR

6.6. CHITTOR(VEPANJIR)CHITTOR(VEPANJIR) 2 X 315 MVA2 X 315 MVA1. CHENNAI RED HILLS1. CHENNAI RED HILLS3. KRISHNAPATNAM**1&23. KRISHNAPATNAM**1&2

2. KADAPA2. KADAPA

7.7. NELLORE(MANUBOLU)NELLORE(MANUBOLU) (2 + 1**) X (2 + 1**) X 315 MVA315 MVA

1. KRISHNAPATNAM**1&21. KRISHNAPATNAM**1&2

8.8. DICHPALLY (NIZAMABAD)DICHPALLY (NIZAMABAD) 2 X 315 MVA2 X 315 MVA1. RAMAGUNDAM1. RAMAGUNDAM

1. RAMAGUNDAM1. RAMAGUNDAM 2. GHANAPUR2. GHANAPUR

9.9. GAJWEL (MEDAK)GAJWEL (MEDAK) 2 X 315 MVA2 X 315 MVA1. RAMAGUNDAM1. RAMAGUNDAM3. BTPS 1&2**3. BTPS 1&2**

2. GHANAPUR2. GHANAPUR4. YEDDUMAILARAM 1&2**4. YEDDUMAILARAM 1&2**

10.10. MALKARAM (SECUNDRABAD)MALKARAM (SECUNDRABAD) (2 + 1**)X (2 + 1**)X 315 MVA315 MVA

1. RAMAGUNDAM1. RAMAGUNDAM3. VTPS**1&23. VTPS**1&2

2. GHANAPUR2. GHANAPUR

11.11. SHANKARPALLY**SHANKARPALLY** 3 X 315 MVA3 X 315 MVA1. GAJWEL 1&2*1. GAJWEL 1&2* 2. MAMIDIPALLY *2. MAMIDIPALLY *

3. SRISAILAM*3. SRISAILAM*

12.12. NARASARAOPETA**(GUNTUR)NARASARAOPETA**(GUNTUR) 2 X 315 MVA2 X 315 MVA1. SRISAILAM 1&21. SRISAILAM 1&22. VTPS 1&22. VTPS 1&2

3. VEMAGIRI 1&23. VEMAGIRI 1&2

13.13. SURYAPETA** (NALGONDA)SURYAPETA** (NALGONDA) 2 X 315 MVA2 X 315 MVA1. VTPS 1&21. VTPS 1&2 2. MALKARAM 1&22. MALKARAM 1&2

400KV SUBSTATIONS OF PGCIL IN AP400KV SUBSTATIONS OF PGCIL IN APS.NoS.No 400KV SUBSTATION400KV SUBSTATION CAPACITYCAPACITY FEEDERSFEEDERS

1.1. RAMAGUNDAM(NTPC)RAMAGUNDAM(NTPC)2 X 200 MVA 2 X 200 MVA 2 X 250 MVA2 X 250 MVA1 X 315 MVA1 X 315 MVA

1. GHANAPUR 1&2 1. GHANAPUR 1&2 2. GAJWEL2. GAJWEL3. MALKARAM3. MALKARAM

4. TALLAPALLY 1&24. TALLAPALLY 1&25. DICHPALLY5. DICHPALLY6. WARANGAL6. WARANGAL7. CHANDRAPUR 1&27. CHANDRAPUR 1&2

2.2. GHANAPUR (HYDERABAD)GHANAPUR (HYDERABAD) 3 X 315 MVA3 X 315 MVA1. RAMAGUNDAM 1&2 1. RAMAGUNDAM 1&2 2. MAMIDIPALLY2. MAMIDIPALLY3. GAJWEL3. GAJWEL

4. NAGARJUNA SAGAR4. NAGARJUNA SAGAR5. KURNOOL5. KURNOOL6. MALKARAM6. MALKARAM

3.3. GAJUWAKA (VISHAKHAPATNAM)GAJUWAKA (VISHAKHAPATNAM) 2 X315 MVA2 X315 MVA1. NUNNA(*GMR)1. NUNNA(*GMR)2. KALAPAKA1&22. KALAPAKA1&25. BERAHUMPUR5. BERAHUMPUR--1&21&2

3. SIMHADRI (VMGR*) 1&2 3. SIMHADRI (VMGR*) 1&2 4. JAIPUR(HVDC)4. JAIPUR(HVDC)3.3. 2 X315 MVA2 X315 MVA

5. BERAHUMPUR5. BERAHUMPUR--1&21&2

4.4. NUNNA (VIJAYAWADA)NUNNA (VIJAYAWADA) 2 X315 MVA2 X315 MVA

1. GAJUWAKA(GMR*)1. GAJUWAKA(GMR*)2. VTPS 1&22. VTPS 1&23. VEMAGIRI 1&2 3. VEMAGIRI 1&2

4. VEMAGIRI 3&4 (#)4. VEMAGIRI 3&4 (#)5. KHAMMAM5. KHAMMAM6. NELLORE 1&26. NELLORE 1&27. LANCO1&27. LANCO1&2

5.5.TALLAPALLYTALLAPALLY(NAGARJUNA SAGAR)(NAGARJUNA SAGAR) 3 X 315 MVA3 X 315 MVA

1. RAMAGUNDAM 1&2 1. RAMAGUNDAM 1&2 2. GHANAPUR2. GHANAPUR3. MAHABOOBNAGAR3. MAHABOOBNAGAR

4. GOOTY(KNL765*)4. GOOTY(KNL765*)5. CHINAKAMPALLY 1&25. CHINAKAMPALLY 1&2

6. 6. BUDIDAMPADU (KHAMMAM)BUDIDAMPADU (KHAMMAM) 2 X 315 MVA2 X 315 MVA1. WARANGAL 1. WARANGAL 2. NUNNA2. NUNNA5. KTPS**1&25. KTPS**1&2

4. MAMIDIPALLY 1&24. MAMIDIPALLY 1&25. KALAPAKA 1&25. KALAPAKA 1&2

7.7. GOOTYGOOTY 2 X 315 MVA2 X 315 MVA1. TLPLY(KNL765*)1. TLPLY(KNL765*)2. SOMANAHALLY2. SOMANAHALLY3. KURNOOL3. KURNOOL

4. NEELAMANGALA4. NEELAMANGALA5. RAICHUR 1&25. RAICHUR 1&2

8.8. CHINAKAMPALLYCHINAKAMPALLY 2 X 315 MVA2 X 315 MVA1. TALLAPALLY 1&2 1. TALLAPALLY 1&2 2. SOMANAHALLY2. SOMANAHALLY

3. KOLAR3. KOLAR4. CHITTOR4. CHITTOR

9.9. NELLORE(MANUBOLU)NELLORE(MANUBOLU) 1. NUNNA 1&21. NUNNA 1&23. MEENAKSHI 1&23. MEENAKSHI 1&2

2. ALAMATHI 1&22. ALAMATHI 1&2

10.10. MULUGU* (WARANGAL)MULUGU* (WARANGAL) 2 X 315 MVA2 X 315 MVA1. RAMAGUNDAM1. RAMAGUNDAM2. KHAMMAM2. KHAMMAM

3. BTPS(KTPS)* 1&23. BTPS(KTPS)* 1&2

1. GAJUWAKA – VEMAGIRI 1&2 IS PROPOSED TO TAKE LILO AT SIMHADRI SS.2. GAJUWAKA – NUNNA CKT IS PROPOSED TO TAKE LILO AT GMR SS.3. 765KV KURNOOL IS ABOUT TO START, 765KV DC TO RAICHUR & 400KV KUMPP-DC, KNL 400-DC, LILO TLPLY-GOOTY.

4. 765KV NELLORE, EAST GODAVARI(VEMAGIRI), SRIKAKULAM IS UNDER FORMULATION STAGE.5. VEMAGIRI TO NUNNA (APTRANSCO) 1&2 LINES WILL BE DISCONNECTED AT NUNNA & EXTENDED UP TO NRPT

400KV NETWORK IN AP400KV NETWORK IN APSIMHADRI

KALAPAKA

GAJUWAKA

IPP3 IPP4

GA

JW

EL

TALLAPALLY

DICHPALLY

WA

RA

NG

AL

RAMAGUNDAM

MA

LK

AR

AM

BTPS

CHANDRAPUR(MAHARASTRA)

HVDCHVDC

JAIPUR

SIM

HA

DR

IBERHUMPUR

RELIANCE

VEMAGIRI

NUNNA

IPP2

IPP3 IPP4

IPP1

GHANAPUR

GA

JW

EL

MB

NG

R

KADAPA

MA

LK

AR

AM

YE

DD

UM

AIL

AR

AM

VTPS

KTPS

KPPTS

KPPTS

GMR

AS

UP

AK

A

LANCO

NE

LL

OR

E

MAMIDIPALLY

SRISAILAM

GUNTUR(NRPT)

KHAMMAM

RAICHURNLR**765ALAMETHI/ CHENNAI

GOOTY

BA

NG

AL

OR

E

KO

LA

R

CHITTOR

BA

NG

AL

OR

E

YE

DD

UM

AIL

AR

AM

MALKARAM

SU

RY

AP

ETA

AS

UP

AK

A

765 KV GRID MAP765 KV GRID MAP

765KV SS765KV SS

SHOLAPURSHOLAPUR

765KV SS765KV SS

WARDHAWARDHA

765KV765KV

GAJWELGAJWEL

765KV SS765KV SS

TEKKALITEKKALI

765KV SS765KV SS

ANGULANGUL

765KV SS765KV SS

KURNOOLKURNOOL

765KV SS765KV SS

RAICHURRAICHUR

SHOLAPURSHOLAPUR

765KV SS765KV SS

VEMAGIRIVEMAGIRI

765KV SS765KV SS

KHAMMAMKHAMMAM765KV SS765KV SS

HYDERABADHYDERABAD

765KV765KV

VODAREVUVODAREVU

GAJWELGAJWEL

POWER GRIDPOWER GRID

765KV SS765KV SS

NELLORENELLORE

765KV765KV

VODAREVUVODAREVUPOWER GRIDPOWER GRID

APTRANSCOAPTRANSCO

VEMAGIRI SUBSTATION DISPLAYVEMAGIRI SUBSTATION DISPLAY

NUNNA – I

(PGCIL)

NUNNA – II

(PGCIL)

GAJUWAKA – I

(PGCIL)

GAJUWAKA – II

(PGCIL)

KALAPAKA – I KALAPAKA – II GOWTHAMI – I GOWTHAMI – II FUTURE – I

PHES

FUTURE – II

PHES

GUNTUR – I GUNTUR – II VPGCL – I

GMR VASAVI

VPGCL – II

GMR VASAVI

KOPCL – I

KONASEEMA

KOPCL – II

KONASEEMA

GVK EXT – I GVK EXT – II 315MVA,

400/220KV

AUTO

TRANSFORMER-I

315MVA,

400/220KV

AUTO

TRANSFORMER-II

VEMAGIRI 765/400 GIS SUBSTATION DISPLAYVEMAGIRI 765/400 GIS SUBSTATION DISPLAY

� A large Pooling station at Vemagiri being planned with 28 nos 400

kV bays, 8 nos 765 kV line bays, 6 nos transformer bays

DISPLAYDISPLAY

400kv protection presentation

Documents

half breaker system

main breaker

tie breaker

middle breaker

inturupting line

feedertie bay

main bay1bay

circuit breakers