sw instruction kharagpur

7/31/2019 Sw Instruction Kharagpur

1/21

SWITCHINGINSTRUCTION&TECHNICALINFORMATION

KHARAGPUR 400 /220/132 KVSUBSTATION

WBSETCL


2/21

ITENERARY

SL DSCRIPTION PAGE

2 | P a g e X X


3/21

Description of Lay out of the Substation:

Kharagpur 400/220/132 KV substation has been conceived with the following line

connectivity with Generating Stations and Other Transmission Substations at its other

end:

SlNo

Description Voltage level Remote End Status

1Kharagpur-Baripoda

SC400 KV Baripoda SS, PGCIL

2Kharagpur- KTPS DC

on SC Tower400 KV

KTPS GeneratingStation WBPDCL

3

4Kharagpur-Midnapur

220 KVMidnapur SS,

WBSETCLUnder

construction

5 Kharagpur-Vidyasagar Park 220 KV Vidyasagar Park,WBSETCL Underconstruction6789

3 | P a g e X X


4/21

Transformer & Reactor Connectivity of the substation

SlNo

Description Voltage level Remarks Status

1 315 MVA TR 1 400/220/33KV

Unloaded 33 KV

2 315 MVA TR 2400/220/33

KVUnloaded 33 KV

3 80 MVAR Reactor 400 KV Bus Reactor

4 160 MVA TR 1220/132/33

KVLoaded 33 KV

5 160 MVA TR 2220/132/33

KVLoaded 33 KV

6 1.5 MVA TR 1 33/0.415 KV Station Load7 1.5 MVA TR 2 33/0.415 KV Station Load

89

Switching of the Substations: 400 KV System

A. Steps for Commissioning of the substations or Black start of the SS by

charging 400 KV Line when the line is open at both ends:

i) On Kharagpur-KTPS Line 1:

1 Inspect the switch yard and confirm that line & Bus isolators of the KTPS Line1 bay is open

2 Confirm that line side earth isolator of KTPS Line 1 bay is open

3 Confirm that bus side earth isolator of KTPS Line 1 bay and other bays areopen

4 Confirm that no temporary earth is made with the KTPS Line 1 bay either inLine or Bus side

5 Confirm that Breaker of KTPS Line 1 bay is open

6 Intimate remote end that all men & materials and earth switch have been

4 | P a g e X X


5/21

removed for opening earth switch at the remote end and closing line isolator atremote end for the said line.

7 Get confirmation from the remote end that earth isolator of the said line isopen at remote end.

8 Check the healthiness of the Carrier signaling with each end by giving a tripcommand of the Breaker switch at both ends and acceptance of the Direct TripRelay at both ends by co-ordaining with remote end. Finally Give a trip

command through the Breaker Control Switch for trip free the mechanism ofthe Breaker Switch.

9 Intimate SLDC that SS is clear for commissioning

10 Intimate SLDC for the above confirmation and in concurrence with SLDCintimate to remote end through message for charging of the KTPS-Kharagpur Line 1 from remote end.

11 Get confirmation from remote end / SLDC that the line has been charged up toLine side isolator of KTPS Line 1 bay.

12 Record the R, Y, B phase voltage of the KTPS Line 1 at the panel meters of thecontrol room. If there is any discrepancy or abnormality intimate remote end toOFF the line.

13 Close the Main Bus 1 isolator of KTPS Line 1 bay for charging on Main Bus 1ORClose the Main Bus 2 isolator of KTPS Line 1 bay for charging on Main Bus 2

14 Close the Line isolator of KTPS Line 1 bay

15 Check the Protection & Control Panel of KTPS Line 1 bay and confirm that norelay is being operated conditions. Test the healthiness of the Alarm &

Annunciation in the Control Panel for KTPS Line 1 Bay. Check that PTSwitching relays have actuated through Main Bus Isolator

16 Get Clearance from the SLDC for closing the breaker of KTPS Line 1 bay

17 Insert the synchronizing pin at the synchronizing socket of the panel and putthe synchronizing switch in ON position

18 Contact with SLDC for final clearance of closing the Breaker

19 On Obtaining Final Clearance from SLDC, Close the Breaker

20 Record the R,Y,B phase Voltages of the Main Bus.

21 Intimate All Concern regarding Commissioning of the substation.

ii) On Kharagpur-Baripoda Line:

5 | P a g e X X


6/21

The sequence of Operation shall be same as charging on Kharagpur-KTPS Line 1. The

remote end for this case shall be Baripoda substation, PGCIL and bay will be

Baripoda Bay.

B. Charging of any 400 KV Line when the SS is Live but line is OFF From

both end

1 Inspect the switch yard and confirm that line & Bus isolators of the Line isopen

2 Confirm that line side earth isolator of the Line is open. Confirm that notemporary earth is made with the Line

3 Confirm that Breaker of the Line is open

4 Intimate remote end that all men & materials and earth switch have beenremoved for opening earth switch at the remote end and closing line isolator atremote end for the said line.

5 Get confirmation from the remote end that earth isolator of the said line isopen at remote end.

6 Check the healthiness of the Carrier signaling with each end by giving a tripcommand of the Breaker switch at both ends and acceptance of the Direct TripRelay at both ends by co-ordaining with remote end. Finally Give a tripcommand through the Breaker Control Switch for trip free the mechanism ofthe Breaker Switch

7 Close the Main Bus 1 isolator of Line for charging on Main Bus 1 ORClose the Main Bus 2 isolator of KTPS bay for charging on Main Bus 2

8 Close the Line isolator

9 Check the Protection & Control Panel of Line and confirm that no relay is beingin operated conditions. Test the healthiness of the Alarm & Annunciation in theControl Panel for KTPS Line 1 Bay. Check that PT Switching relays haveactuated through Main Bus Isolator.

10 Intimate SLDC that Line is clear for charging

11 On Obtaining Clearance from SLDC, intimate remote end that Breaker will beClosed

12 Insert the synchronizing pin at the synchronizing socket of the panel and putthe synchronizing switch in ON position

13 On Obtaining Final Clearance from SLDC, Close the Breaker.

14 If the line Holds, intimate SLDC & Other end that line has been charged & Hold.

C Closing of the Breaker when the line has tripped on Line Fault without

Auto Reclosing Features

6 | P a g e X X


7/21

It should be remembered that Kharagpur substation is a grid substation and

connected with Generating Stations and Grid substation of other utilities.

Normally in the Grid Substation line is charged in Dead Line Charging Mode

(DLC Mode) and synchronization is done at Generating Station end. If there

is any exigency synchronization is done at the grid substation as per advice

of SLDC. Hence for Charging Kharagpur-KTPS Line it should always be

charged from Kharagpur end keeping the line OFF when any of Kharagpur-

KTPS line is not closed.

1 Accept the Facia & Alarm. Note down the Relay of the Faulty Line with distanceto fault location. Relays of both Groups should be obtained to ascertain thefault to be true in nature. Get the relays from remote end with distance to faultlocation. Compare to ascertain the fault. Reset the Alarm and Relays.

2 Contact SLDC and intimate.

3 Get clearance from SLDC. Contact remote end. Charge the Line after 5minutes.

4 If the Line does not hold and trips again note down the relay. Capture the FaultCurrent, Voltage unbalances, and distance to fault location from the Relays.

Try to get the same information from remote end. Analyse the Fault. Ondiscussion with DE: Maintenance and concurrence from SLDC close thebreaker again a minimum 15 minutes after second trip.

5 If the line does not hold after 2nd close, Declare Breakdown of the line. Messageto all concern. The message must contain the name of the faulty Phase,Distance to Fault Location, and Name of the Patrolling Jurisdiction.

D Closing of the Breaker when the line has tripped on Line Fault withAuto Reclosing Features

1 Auto reclosing features are incorporated in the 400 KV Lines at both end of theline. The features are kept in 3 phase auto reclosing while provision is keptfor 1 phase, 1& 3 phase and Non Auto through Auto Reclosing switch.Auto Reclosing occurs in conjugation with protection signaling throughcommunication channel failure of which lead to non performance of AutoReclosing.

2 When there is a transient fault in the line, the line trips and closessimultaneously through Auto Reclosing Relays.

3 For successful Auto Reclosing the Alarm with facia Auto Reclosing Operatedwill appear. Accept the alarm. Note down the Relay and record it.

4 If the fault Persists, The Line will tripp on First shot through Auto ReclosingRelays. Alarm & Facia Auto Reclosing Lock out shall appear.

5 Note down the relay. Capture the Fault Current, Voltage unbalances, and

7 | P a g e X X


8/21

distance to fault location from the Relays. Try to get the same information fromremote end. Analyse the Fault. On discussion with DE: Maintenance andconcurrence from SLDC close the breaker again a minimum 15 minutesafter second trip if SLDC agrees. If SLDC does not agree, DeclareBreak Down of the Line. Message to all concern. The message must containthe name of the faulty Phase, Distance to Fault Location, and Name of thePatrolling Jurisdiction.

5 On concurrence of SLDC If the line is closed after 15 minutes and does not hold

after 2nd

close, Declare Breakdown of the line. Message to all concern. Themessage must contain the name of the faulty Phase, Distance to FaultLocation, and Name of the Patrolling Jurisdiction.

E Closing of the Breaker when the line has tripped on Over-Voltage

1 Over Voltage (OV) Tripping Features are incorporated in 400 KV Lines at bothend of the line. The settings are given in Two Groups with Alarm & Trip Facilityin both the Group.OV Tripping is incorporated with Direct Trip Features through CommunicationChannel to terminate the line form both end at the time of OV in the system.

2 On tripping through OV, accept the facia & alarm. Note down the relay. Get therelays from remote end. Compare to ascertain the actuation of relay at whichend. Reset the Alarm and Relays.

3 Note down the Bus Voltages at own end and remote end. Get clearance fromSLDC. Contact remote end. Charge the Line.

F Blocking of Auto Reclose Relay

1 The Auto Reclose (AR) Features operates successfully when the protectionsignal through carrier channel is transmitted perfectly, the closing path of thebreaker is through without failure of any closing interlock, the AR Switch is notkept in Non Auto Selection.For non fulfillment of any above conditions, AR Blocking will happen duringany Fault of the line.

2 The switching sequence shall be as per C ifAR Blocking occurs.

8 | P a g e X X


9/21

G Steps for Charging of the Transformer 400/220/132 KV

1. First Commissioning of the Transformer

1 Get clearance from the respective department (e.g. Project Department,

Testing Department) and manufacturer on record, contact SLDC for gettingclearance of commissioning of the transformer.

2 Inspect the switch Yard to confirm all permanent earth switch associated withline isolator is open. Also confirm that all temporary earth rods aredisconnected from the transformer. Be sure that all men & materials areremoved from the Transformer.

3 Inspect the transformers to confirm that oil is at appropriate level in theconservator tank. Check that all the external connectivity with Bushings,Lightning Arrester, and Neutral Bushings are firmed.

4 Inspect the Control & Relay panel that no relay is being at operatingconditions. Check the RTCC panel that Tap Changing Indications &Temperatures meters are showing actual results with the Transformers.Test the healthiness of the Alarm & Annunciation in the Control Panel for KTPSLine 1 Bay.

5 Normally First Commissioning is done at Normal Tap No. 9. If SLDC on judgingthe Bus Voltage asks to change the Tap, Change the tap from RTCC to thedesired tap.

6 Switch ON the BUS ISOLATOR ( Main 1 or Main 2 ) in HV Side

7 Switch ON the LINE ISOLATOR ( Main 1 or Main 2 ) in HV Side

8 Take final Clearance from SLDC for Charging of the Transformer

9 Switch ON the BREAKER to charge the Transformer. Intimate all concern.

10 Note down the Charging Current, MVAR from the Panel Meter

11 Inspect the Transformer from a safe distance at switch yard whether anyabnormal sound is audible from the transformer or any flashing is visible fromexternal connectivity

12 Keep the Transformer In Charged Condition for minimum 48 Hours (or assuggested by the manufacturer) with Hourly recording the Current, MW, MVAR

13 After stipulated period of no load Charging of the transformer, Switch OFF theBreaker & Isolator of the transformer

14 Take shut down of transformer

15 Allow maintenance personnel to avail the shutdown of the transformer for

9 | P a g e X X


10/21

releasing of gas developed inside the transformer through opening of someplugs in the Top Header of the Radiator Bank, Checking of the transformerthoroughly whether oil leakages developed from any part of transformer orsweating of Gaskets is excessive in any oil sealing gaskets.

16 After getting clearance from the maintenance personnel, again charge thetransformer by switching ON the isolators and Breakers from HV side.

17 Close the Line Isolators of LV side

18 Contact with SLDC for getting clearance of loading the transformer

19 Switch ON the LV side Breaker

20 Record the Current, Voltage, MW, MVAR of the transformer at both LV HV side

2 Switching of Transformer if it trips on Differential, REF, Buchholz, WT

& OT, PRV relay

1 In case of Tripping of the Transformer for such relay operation, the respective

relay in the HV side Protection Panel and Tripping Relay in the HV sideProtection or Control panel will actuate. Through Master Trip relay it willactuate the trip relay in the LV side Control panel to operate the LV sideBreakers.

2 First accept the alarm and annunciation in the HV side control panel. Recordthe particular Relay Flag in the Protection Panel. Reset the operated main relayand tripping relay in the Protection or Control Panel.

3 Reset the tripping relay in the LV side Control panel

4 Intimate SLDC & all concern

5 Switch OFF the Isolators at both HV & LV side.

6 Allow Maintenance personnel to avail the shut down for checking & Testing ofthe Transformer.

3 Switching of Transformer if it trips on Over Flux relay

1 The reason for tripping of the Transformer on Over Flux Relay is either rise ofVoltage or fall of frequency. The respective relay will trip the transformer both

from HV & LV side

2 First accept the alarm and annunciation in the HV side control panel. Recordthe particular Relay Flag in the Protection Panel. Reset the operated main relayand tripping relay in the Protection or Control Panel.

3 Reset the tripping relay in the LV side Control panel

10 | P a g e X X


11/21


5 Switch ON the Breakers from HV side first and then load the transformer byswitching ON the LV side Breakers on getting clearance from SLDC

6 After normalization, intimate SLDC & all concern.

4 Switching of Transformer if it trips on Over Current or Over Load relay

1 The reason for tripping of the Transformer on Over current or Over Load Relayis either rise of current due to internal trouble or excessive load of thetransformer. The respective relay will trip the transformer both from HV & LVside

2 First accept the alarm and annunciation in the HV side control panel. Recordthe particular Relay Flag in the Protection Panel. Reset the operated main relayand tripping relay in the Protection or Control Panel.In case of Over load relay operation reset the relay in LV side first, then in HVside.


5 Switch ON the Breakers from HV side first and then load the transformer byswitching ON the LV side Breakers on getting clearance from SLDC

6 After normalization, intimate SLDC & all concern.

11 | P a g e X X


12/21

Standard Operating Practice of Switching of Isolators &

Breakers

A Isolator Operation

The operation of Isolators in 400 KV Switch Yard is to be done in sequential manner

unless which the operation shall not be permissive. The interlock schemes are

incorporated for operation of any isolators according to which the sequence of

operation are listed below:

Description Permission Purpose

Operation ofMain Bus- 1Isolators of Bay

1. Permissive when M2 Isolator,M2Earth Switch & Breaker is Open ofthat Bay

OR

2. Permissive when M1 & M2isolator of Bus coupler bay andBreaker of Bus coupler Bay, M2Bus isolator and Breaker of that

Bay is closed

1. For Normal Operation underdead condition

2. For changeover from Bus 1to Bus 2 on live condition

Operation ofMain Bus- 2Isolators of Bay

1. Permissive when M1 Isolator,M2Earth Switch & Breaker is Open ofthat Bay

OR

2. Permissive when M1 & M2isolator of Bus coupler bay andBreaker of Bus coupler Bay, M1Bus isolator and Breaker of that

Bay is closed


2. For changeover from Bus 1to Bus 2 on live condition

Operation ofLine Isolator ofBay

1. Permissive when Breaker, lineside Earth switch A and Bus sideEarth Switch B is open.

OR

2. Permissive when Main Bus 1 or


12 | P a g e X X


13/21

Main Bus 2 isolator, Transfer BusIsolator and Breaker of Bus

Transfer Bay and Transfer BusIsolator of that Bay is Closed butBreaker of the bay is open.

2. After Change over the lineon Transformer on Bus

Transfer Bay

Operation ofEarth Switch ofMain Bus 2

Permissive when Main Bus 1 ,Main Bus 2 & line isolator, Breakeris Open

Maintenance work at theBreaker

Operation of line

side Earthswitch A

Permissive when Line Isolator,

Transfer Bus Isolator is Open &remote end line isolator is open orno operating normal voltage isavailable in line

Maintenance work at the Line

Operation ofBus side Earthswitch B

Permissive when Line Isolator,Breaker is open

Maintenance work at theBreaker

Description Permission Purpose

Operation of M1

Isolator of Buscoupler Bay

M1 Earth Switch & Breaker is

Open

For Closing Of BC Breaker

Operation of M2Isolator of Buscoupler Bay

M2 Earth Switch & Breaker isOpen

For Closing Of BC Breaker

Operation of M1Earth Switch ofBus couplerBay

M1 Isolator & BC Breaker is open Maintenance work of BCBreaker

Operation of M2Earth Switch ofBus couplerBay

M2 Isolator & BC Breaker is open Maintenance work of BCBreaker

Operation ofTransfer BusIsolator of Bay

Transfer Bus Isolator of all otherBay is open, Transfer Bus BayBreaker is open

Operation of Bus Transfer Bayfor changing any Bay Breakerto BT Breaker

Operation ofMain Bus 1

Isolator of BusTransfer Bay

M2 isolator, BT Breaker is Open Operation of Bus Transfer Bayfor changing any Bay Breaker

to BT Breaker

Operation ofMain Bus 2Isolator of BusTransfer Bay

M1 isolator, BT Breaker is Open Operation of Bus Transfer Bayfor changing any Bay Breakerto BT Breaker

Operation ofTransfer Bus

Transfer Bus Isolator of aparticular Bay is closed, Transfer

Operation of Bus Transfer Bayfor changing any Bay Breaker

13 | P a g e X X


14/21

Isolator of BusTransfer Bay

Bus isolator of all other bay isopen, BT Breaker is Open

to BT Breaker

Procedure of Shut Down

A Pre-arranged Shut Down of Line

1 Contact SLDC to intimate pre-arranged shut down program.

2 On getting clearance from SLDC, intimate remote end for shut down of Line.

3 Switch OFF the Breaker.

4 Open Line Isolator

5 Intimate other end and get confirmation of switching of Breaker and LineIsolator at other end through message.

6 Close the Line Earth Switch. Intimate other end through message for closingof line Earth switch at Other end.

7 Get confirmation through message from other end regarding closing of lineEarth Switch at Other end

8 Switch off the AC supply to the Line Isolator to guard the unwanted closing ofline isolator

9 Put Mechanical Lock at the line Earth Switch to guard the unwanted opening

of Earth Switch10 Put Shut Down plate in the respective Switch of the Control Panel

11 Filled up the standardized Permit To Work Card (PWC Card) withsignature. Keep a record in the Shut Down register.

12 Hand Over the PWC Card to authorized representative of maintenancedepartment keeping a receipt signature in the register

14 | P a g e X X


15/21

B Pre-arranged Shut Down of Transformer

1 Contact SLDC to intimate pre-arranged shut down program.

2 On getting clearance from SLDC, Check the loading of the Transformersrunning parallel with the transformer. If the loading is not permissible for shutdown intimate SLDC

3 On getting Final Clearance from SLDC Switch OFF the Breaker of HV Side andthen LV side.

4 Open Line Isolator of HV side , then LV side

5 Put Shut Down plate in the respective Switch of the Control Panel

6 Filled up the standardized Permit To Work Card (PTW Card) withsignature. Keep a record in the Shut Down register.

7 Hand Over the PTW Card to authorized representative of maintenancedepartment keeping a receipt signature in the register

C Emergency Shut Down for Trouble of any Bay Equipment in the

substation

1 Contact SLDC to intimate the Emergency Shut Down requirement withreasons.

2 Send a message to SLDC and other requisite concern describing the reasonsof shut Down, Possible Time required to attend and rectify the trouble.

3 Get clearance from SLDC

4 Follow Procedure as described in A or B for issuing PTW Card

D Emergency Change over from own Bay to Bus Transfer Bay

1 Contact SLDC to intimate the requirement of Change over the circuit from ownBay to Bus transfer Bay with reasons.

2 Send a message to SLDC and other requisite concern describing the reasonsof change over with shut Down of equipments (Breaker or Isolator), Possible

Time required to attend and rectify the trouble.

3 Get clearance from SLDC

4 Be sure that Bus Transfer bay is not engaged with other reasons or the BusTransfer bay itself is not under shut down or Break down conditions

5 Close the Transfer Bus Isolator of the Bay. Transfer will be Charged throughthis Isolator

15 | P a g e X X


16/21

6 Close the Main Bus Isolator of BT Bay corresponding to selection of the MainBus of the Bay

7 Close the Transfer Bus Isolator of Bus Transfer Bay

8 PUT the TTS (Trip Transfer Switch) of the Bay in Transfer position

9 Close the Bus Transfer Breaker

10 Wait a minute. Put the TTS in INTER Position

11 Open the Breaker of the Bay

12 Put the TTS in Transfer position

13 Open the Main & Line Isolator of the Bay

14 Intimate SLDC regarding On Line Change over and engagement of the BusTransfer bay.

15 Allow Shut down of the Breaker with the restricted zone between Bus side

pipe buses of Line isolator to Breaker side pipe bus of Main 1 Isolator.Issue PTW Card following the rule Described in A

E Emergency Change over from Main Bus 1 to Main Bus 2

1 For any disturbance with main Bus Isolator of any Bay it may be required toChange over the bay from Main Bus 1 to main Bus 2 or vice versa.

2 For any disturbance with main Bus itself, it may be required to Change overthe entire bay from Main Bus 1 to Main Bus 2 or vice versa.

3 For any of the above conditions on line Bus Change over may be done withintimation to SLDC and thereafter obtaining clearance from SLDC

4 For this Change over Bus coupler M1 & M2 Isolator and Breaker need to bemade ON

5 Change over from one Bus to Other Bus could be done on line by closing theother Bus Isolator first then opening the previous bus isolator.

6 For making one Bus dead total bay have to be taken on other Bus.

7 PT switching Relay shall have to checked

8 Finally BC Breaker should be made OFF. Then M1 & M2 Isolator of BC shouldbe made open.

9 Intimation should be given to concerned end.

16 | P a g e X X


17/21

Procedure of Withdrawal of Shut Down and Normalisation

A Normalisation of Line

1 Acceptance of Return of PTW Card checking the declaration that All men &Material has been removed and the line is safe for charging

2 Intimate SLDC for normalisation of line. Intimate other end.

3 Open the Earth Isolator of the line. Intimate other end through message foropening of Earth Isolator at other end.

4 After getting confirmation of opening of Earth Isolator at other end, Close theLine Isolator and Bus isolator. Intimate Other end for closing the line & BusIsolator.

5 Obtain Confirmation from other end regarding closing of Isolators at otherend.

6 Trip free the Breaker switch by turning to Trip direction intimating other end.

7 If the line is connected with Generating station it should be made On from thisside

8 Intimate SLDC. Get clearance for charging. Intimate other end

9 Check the protection panel that all relay are in reset conditions. Check thehealthyness of Alarm & Annunciation.

10 Insert the synch. Pin to the socket. Made ON Synchronizing Switch.

11 Close the Breaker. Intimate SLDC & Other end

12 On charging from other end record the load flow of the line. Intimate allconcerned.

17 | P a g e X X


18/21

Technical & General Information of the substation

SL Description Information Remarks

1 Order Reference

TR.PROJ/Kharagpur 400 KV-SS/Supply/T-176/171 Dt

30/04/2009TR.PROJ/Kharagpur 400 KV-SS/Erection(E)/T-176/172 Dt

30/04/2009TR.PROJ/Kharagpur 400 KV-SS/Erection/T-176/173 Dt

30/04/2009

2 Date of LOA 30/04/2009

3 Name of the Contractor M/s AREVA T&D India Ltd

4 Project Value Rs.10,61,98,4250

5 Total Area 73.6 acres(approx)

6 Total Switch Yard Area 101200 sq met

7 Area of 400 KV SW Yard 72000 sq met

8 Area of 220 KV SW Yard 21000 sq met

Area of 132 KV SW Yard 8200 sq met

Area of Control Room 780 sq met

No of Quarters One C type quarter

18 | P a g e X X


19/21

No of Dormitory Three Dormitories

Date of Commissioningof the substation

30 months from the date of LOA

Normal System Voltage 400 KV/ 220 KV/132 KV

Highest System Voltage 420 KV/ 245 KV/145 KV

Number of bays 400 KV-10: 220 KV-11: 132 KV-08

Number Lines emanatingfrom Substation

400 KV-05: 220 KV-04: 132 KV-04

Configuration of Bus in400 KV, 220 KV,132 KV

Two Main Bus & One Tr. bus in allsystem

No Of 400/220/132 KVTransformer

Two

Manufacturer M/s AREVA ,Naini

Capacity of 400/220/132

KV Transformer

315 MVA, 454.68 A/ 826.68/ 1840

A

Number of Tap 17

Percent Impedance atNormal Tap no.9(HV-IV)

12.5

No Of 220/132/33 KVTransformer

Two


Capacity of 220/132/33

KV Transformer

160 MVA, 420 A/ 700 /788 A

Number of Tap 17

Percent Impedance atNormal Tap no.9 (HV-IV)

12.5

Capacity of Bus Reactor 80 MVAR 420 KV


Earthing of Reactor Direct Earthing

Number of StationTransformer withCapacity

2 x 1.5 MVA


Earthing System of theSw. Yard

Effective Earthing

19 | P a g e X X


20/21

Diameter of the EarthRod

32 mm

Resistivity of the soil 83 ohm met

Earthing Resistance 0.126 ohm

DC system of thesubstation

Normal DC Voltage

Capacity of Battery400 KV 2 sets of 108 numbers2.1 V cell 220 KV 1 set of 108

numbers 2.1 V cell

Capacity of Charger

Group 1 Protection of400 kV Transformer

Group 2 Protection of400 kV Transformer

Group 1 Protection of400 kV Line

Group 2 Protection of400 kV Line

Group 1 Protection of400 kV Reactor

Group2 Protection of 400kV Reactor

Main Protection of 220KV Transformer

Backup protection of 220KV transformer

Main Protection of 220KV Line

Backup protection of 220KV Line

Main Protection of 132KV Line

Backup protection of 132KV Line

Fire Fighting System ofthe SS

Water Hydrant FF systemHVWS for 400 KV Tr & Reactor

Capacity of DG set of the

Substation

250 KVA

Capacity of the MainPump of Fire FightingSystem

410 CUM/HR, 130 KW Motor

Capacity of the Jockeypump

15 CUM/HR, 11 KW Motor

Lightning Protection ofthe substation

400 KV- DSLP, 14 NOS LM, Height50 M

20 | P a g e X X


21/21

Lighting System of thesubstation

MLDB,ELDB etc provided.

21 | P a g e X X

sw instruction kharagpur

Documents