mv main types of protections

8/18/2019 Mv Main Types of Protections

1/19

Block 5 ELECTRICAL NETWORKS PROTECTIONSELECTRICAL NETWORKS PROTECTIONS § 5.7Electrical Distribution for maintenance engineer

Institut

Schneider

FormationSlide 1

Institut

Schneider

FormationSlide 1

NETWORKS PROTECTIONSNETWORKS PROTECTIONS

Block 5.7Block 5.7 typical MV protectio! per applicatiotypical MV protectio! per applicatio


2/19


Institut

Schneider

FormationSlide 2

Institut

Schneider

FormationSlide 2

Protections, 2 main objectivesProtections, 2 main objectives Cotri"#te to t$e !a%ety o%

people a& e'#ip(et...

)*$ile opti(i!i+ coti#ity

o% !er,ice

S a f e t y C

o n t i n u i t y

o f s e r v i c e

o p t i m i s a

t i o n

o f c o s t s


3/19


Institut

Schneider

FormationSlide 3

Institut

Schneider

FormationSlide 3

What exactly is a protection ? What exactly is a protection ?

Sensor currentvoltage

A protection device does not prevent the fault fromoccurring, but limits the consequences ...

TriingcoilTriingcoilTriingcoil

Detect and isolate the fault

Preserve continuity of supply

Measure

Compare

Decide


4/19


Institut

Schneider

FormationSlide !

Institut

Schneider

FormationSlide !

The protection planThe protection plan

T"es of

disturbance

Eart#ing

s"stems

$et%ork

arc#itectures

PROTECTION PLAN

Settings

&omonents

to rotect

T"e of rotection function

Discrimination

C-OICE

O

RELA/


5/19


Institut

Schneider

FormationSlide 5

Institut

Schneider

FormationSlide 5

List of functions availableList of functions available

with AN! co"eswith AN! co"es

RMS


6/19


Institut

Schneider

FormationSlide '

Institut

Schneider

FormationSlide '

List of functions availableList of functions available

with AN! co"eswith AN! co"es


7/19Block 5 ELECTRICAL NETWORKS PROTECTIONSELECTRICAL NETWORKS PROTECTIONS § 5.7Electrical Distribution for maintenance engineer

Institut

Schneider

FormationSlide (

Institut

Schneider

FormationSlide (

Lin# protection$ un"er%roun" cablesLin# protection$ un"er%roun" cables

Underground distribution in urban

environments

cable feeder

0 0 0

incomer

Downstream faults:

short-circuits

Phase breaage

No reclo!i+

Reco((e&e& protectio!1 Directional eart# rotection )'7$*

)for long caacitive feeders*

+vercurrent rotection )5,-51*

esidual overcurrent rotection )5,$-51$* /#ase unbalance rotection )!'*

0ine differential rotection )(70*



Institut

Schneider

FormationSlide

Institut

Schneider

FormationSlide

&ust a '(&ust a '( hort)circuit hort)circuit onon

22*#( un"er%roun" cable22*#( un"er%roun" cable



Institut

Schneider

FormationSlide 1,

Institut

Schneider

FormationSlide 1,

+usbars protection+usbars protection

Electrical switchboards

Sc$2(a 3

! energy concentration " # need to eliminate the fault quicly

Fault short-circuits $bet%een bars and

%ith the earth& temperature rise

insulation loss

Reco((e&e& protectio!

0ogic discr.

0ine overcurrent )5,-51*

esidual overcurrent

)5,$-51$* Time discrimination

Busbar differential )(7B*



Institut

Schneider

FormationSlide 11

Institut

Schneider

FormationSlide 11

) Protection example of substation) Protection example of substation

busbars with 2 incomersbusbars with 2 incomers

&i!cri(iatio

Directional rotection set iffault

protectio! +vercurrent rotection )5,-51*

esidual overcurrent rotection

)5,$-51$*

Directional #ase rotection )'7*

&urrent and direction



Institut

Schneider

FormationSlide 12

Institut

Schneider

FormationSlide 12

Transformer Transformer protection protection

Protectio! a#lt!

S#ortcircuit

Eart# fault

+verload

4 a6. o

5,$-51$4 estricted

differential '!E84 Tank eart#

5,$-51$9 5,:-51:

4 +vercurrent 5,-514 transformer

differential (7T4 Buc##ol;4 D:/T '3

4 +vercurrent 5,-514 T#ermal overload

!S4 Temerature !T4 T#ermostat 2'4 0evel s%itc# 71

4



Institut

Schneider

FormationSlide 13

Institut

Schneider

FormationSlide 13

Transformers protectionTransformers protection

Applications xamples Applications xamples

mall -(.L( transformer

fuse protecte"

Lar%e -(.L( transformer

brea#er protecte"

mall '(.-( transformer Lar%e '(.-( transformer



Institut

Schneider

FormationSlide 1!

Institut

Schneider

FormationSlide 1!

-otor protection-otor protection

4 =oltage sag4 >nbalance

4 S#ortcircuit

4 Eart# fault4 0oss of

s"nc#ronism

4 +verload4 Starting too long4 0ocked rotor

4 8re?uent starting

4 +vercurrent 5,-51

4 ac#ine differential (74 a6. o 5,$-51$9

7(/S

4 >ndervoltage 274 a6. reverse

comonent !'4 +vero%er 32/

4 T#ermal overload

!S4 !(

4 5104 in. 379 /9 37/

4 0imited number of

startus ''

4 @ctive o%er

return voltage sag

4 Destruction of

coiling and magneticcircuit4 otor deceleration

4 +vercurrent4 Stator temerature

rise

4 /um unriming4 ec#anical

breakage

4 Temerature rise

Protectio! a#lt! I(pact!

'pstream

(nternal

Do%nstream

'se



Institut

Schneider

FormationSlide 15

Institut

Schneider

FormationSlide 15

-otors protection-otors protection




Institut

Schneider

FormationSlide 1'

Institut

Schneider

FormationSlide 1'

/enerator protection/enerator protection

S#ortcircuit

4 +vercurrent 5,-51

4 ac#ine differential (74=oltage restrainedovercurrent 5,-51=

@ctive o%er return>nbalance

32/9 !'

0oss of s"nc#ronism 4 7(/S4 in. imedance

21B

Eart# fault 4 a6. o 5,$-51$4 estricted eart# differential '!E8

4esidualovervoltage 5$

8aults relating to

incorrect regulation

4 +ver and underfre?uenc" (1A-(104 >ndervoltage 274 overvoltage 5

4 Destruction

of %indings

magnetic circuit

4 ec#anical riskfor turbine C rotortemerature rise

4 +verseed @bsortion ofeactive o%er)runs as a motor*

temerature rise

4 Temerature rise

and oor efficienc"

4 Destruction of

%indings

magnetic circuit

Protectio! a#lt! I(pact! (nternal

)*ternal machinery, or load

5456V

http://typical%20motor%20protections%20%26%20settings.pdf/http://typical%20motor%20protections%20%26%20settings.pdf/http://typical%20motor%20protections%20%26%20settings.pdf/



Institut

Schneider

FormationSlide 17

Institut

Schneider

FormationSlide 17

/enerators protection/enerators protection




Institut

Schneider

FormationSlide 1(

Institut

Schneider

FormationSlide 1(

0apacitor protection0apacitor protection

&aacitor elementinternal s#ort

circuit

4 +vercurrent

5,-51

4 T#ermal overload!S

4 a6. reverse

comonent !'

4 +vervoltage 5

8rame fault 4 a6. o 5,$-51$4 esidual

overvoltage 5$4 a6. reverse

comonent !'

4 Destruction of

caacitors

)overressure insealed tank9 leakage

of dielectric li?uid*

4 >nbalance

Surge 4 Destruction of

insulation

4 T#ermal overload!S4 a6. reverse

comonent !'4 Secific

4 eduction incaacit"

4 unbalance

bet%een 2 stars

S#ortcircuit in t#e

connections

Protectio! a#lt! I(pact!

4 Destruction of

connections

and caacitors )overressure in

sealed tank9 leakage

of dielectric li?uid*

Wit$o#t or *it$ iteral %#!e!



Institut

Schneider

FormationSlide 1

Institut

Schneider

FormationSlide 1

0apacitors protection0apacitors protection



19/19

Institut

Schneider

Institut

Schneider

TheThe

protection %ui"e protection %ui"e

will provi"e you with more "etailswill provi"e you with more "etails

Net*ork!

Eart$i+ !y!te(!

I!c

Se!or!

Protectio %#ctio!

Selecti,ity

Net*ork protectio$ttp1***.!c$ei&erelectric.co( !earc$1 8Protectio +#i&e9

mv main types of protections

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