n Merlin Gerin n Modicon n Square D n Telemecanique

2-3 ELECTRICAL NETWORK SELECTION GUIDE

a) Power circuit1. MV/LV sensors and accessories

2. Protections2.1 Definitions2.2 Short-circuit currents2.3 Grounding systems2.4 Selectivity2.5 Protection relays2.6 The MV fuse2.7 MV line protection

Which Sepam should be used for the MV line protection? The answer is given in the following pages.

2.8 MV transformer protection2.9 MV motor protection2.10 MV generator protection2.11 MV capacitor bank protection2.12 MV bus tie protection2.13 Reserved for later use2.14 Further information on specific protections

3. Measuring apparatus

4. Metering apparatus

5. Recording apparatus

GUIDE

Follow the guide and the arrow to identify

the place of this documentwithin the detailed table of

contents of part 2-3 a)

MV line protection

date

02/92

C23a) 27

revised

12/95

page 2

date

02/92

C23a) 27

revised

12/95

SELECTION TABLE: MV line incomer

elect in the table below the corresponding protection schematicsheet, according to the grounding system, the type of network, and relays.S

+

important:the solutions proposed in this document are for general use.They are a direct application of the MV protection guide ref.: CG0021X(binder C, chapter 1, topic 3).These elements are to be used as a basic solution for tenders. They couldbe also adapted to specific requirements of customer specifications.Sepam 2000 can be use without remote transmission.

note (1): compartmented switchgear and controlgear with non-metallic partitions (SM6). Metal-enclosed switchgear and controlgear in which components are arranged in separatecompartments as for metal-clad switchgear and controlgear, but with one or more non-metallicpartitions (IEC 298). note (2): metal-clad switchgear and controlgear. Metal-enclosed switchgear and controlgear in which components are arranged in separatecompartments with metal partitions intended to be earthed (IEC 298).

MV line protection

OVERHEADor

UNDERGROUND

single incomer

2 incomers in //

LI03 LI01

LI04

LI05 LI02

///

see selection table on page 4

type ofnetwork

control by

configuration

UNGROUNDED NEUTRALRESISTANCE GROUNDINGon upstreamMV network

Sepam1000

Sepam2000

Sepam1000

Sepam2000

remote transmissionwithout MG (JBus)

remote transmissionwithout MG (JBus)

withdrawable circuit breaker (2)

withdrawable circuit breaker (2)

fixed switch (1)

fixed circuit breaker (1)

page 3

date

02/92

C23a) 27

revised

12/95

+

important:the solutions proposed in this document are for general use.They are a direct application of the MV protection guide ref.: CG0021X(binder C, chapter 1, topic 3).These elements are to be used as a basic solution for tenders. They couldbe also adapted to specific requirements of customer specifications.Sepam 2000 can be use without remote transmission.

note (1): compartmented switchgear and controlgear with non-metallic partitions (SM6). Metal-enclosed switchgear and controlgear in which components are arranged in separatecompartments as for metal-clad switchgear and controlgear, but with one or more non-metallicpartitions (IEC 298). note (2): metal-clad switchgear and controlgear. Metal-enclosed switchgear and controlgear in which components are arranged in separatecompartments with metal partitions intended to be earthed (IEC 298).

MV line protection

SELECTION TABLE: MV line feeder

elect in the table below the corresponding protection schematicsheet, according to the grounding system, the type of network,and relays.S

OVERHEADor

UNDERGROUND

LF03 LF01 LF04 LF02

see selection table on page 5

type ofnetwork

control by

UNGROUNDED NEUTRALRESISTANCE GROUNDINGon upstreamMV network

Sepam1000

Sepam2000

Sepam1000

Sepam2000

remote transmissionwithout MG (JBus)

remote transmissionwithout MG (JBus)

withdrawable circuit breaker (2)

fixed switch (1)

fixed circuit breaker (1)

page 4

date

02/92

C23a) 27

revised

12/95

MV line protection

SELECTION TABLE: MV line incomerwith cubicle type SM6

elect in the table below the corresponding protection schematicsheet, according to the grounding system, the type of network, and relays.

step 1: selection of the protection schematic sheetstep 2: corresponding accessories proposed

S

singleincomer

IM

DM1

type ofnetwork

controlby

configuration

RESISTANCEGROUNDINGon upstreamMV network

JBus

Sepa

m 2

000

Sepa

m 1

000

VIP

STAT

IMAX

RV11

2

RH11

0

LI06

LI08

LI12 LI13

LI07

LI09

LI14

LI11(3)

LI10(3)

B

B O

B

B B B O O O

B B

B

O O OO

O

UNGROUNDEDNEUTRAL

JBus

CIT RI

Sepa

m 2

000

Sepa

m 1

000

VIP

with

relea

se (1

)

with

relea

se (2

)

with

out r

eleas

e

manual

auxiliary contacts

moto.

type of control LV compts

0 3 3 8 8 2 sig

nallin

g lam

ps

2 pu

sh b

utto

ns

1 lo

cal-r

emot

e sw

itch

accessories

addi

tiona

l inc

losu

re o

n to

p of

cub

icle

low

volta

ge c

ompa

rtmen

t 100

mm

withremotetransm.

withoutremote transmission

step 1

ste

p 1

ste

p 2

OVER

HEAD

orUN

DERG

ROUN

D

O = Optional extraB = Basic proposal

note (1): shunt trip opening release. note (2): opening and closing release.note (3): on this page, the relay is optional.

If you need this relay, you have to add a low voltage compartment 100 mm on the cubicle.

page 5

date

02/92

C23a) 27

revised

12/95

MV line protection

OVER

HEAD

orUN

DERG

ROUN

D IM

DM1

type ofnetwork

controlby

JBus

Sepa

m 2

000

Sepa

m 1

000

VIP

STAT

IMAX

RV11

2

RH11

0

LF05

LF07

LF11 LF12

LF06

LF08

LF13

LF10(3)

LF09(3)

B

B O

B

B B B O O O

B B

B

O O OO

O

JBus

CIT RI

Sepa

m 2

000

Sepa

m 1

000

VIP

with

relea

se (1

)

with

relea

se (2

)

with

out r

eleas

e

manual

auxiliary contacts

moto.

type of control LV compts

0 3 3 8 8 2 sig

nallin

g lam

ps

2 pu

sh b

utto

ns

1 lo

cal-r

emot

e sw

itch

accessories

addi

tiona

l inc

losu

re o

n to

p of

cub

icle

low

volta

ge c

ompa

rtmen

t 100

mm

withremotetransm.

withoutremote transmission

step 1

ste

p 1

ste

p 2

RESISTANCEGROUNDINGon upstreamMV network

UNGROUNDEDNEUTRAL

O = Optional extraB = Basic proposal

note (1): shunt trip opening release. note (2): opening and closing release.note (3): on this page, the relay is optional.

If you need this relay, you have to add a low voltage compartment 100 mm on the cubicle.

SELECTION TABLE: MV line feeder withcubicle type SM6

elect in the table below the corresponding protection schematicsheet, according to the grounding system, the type of network, and relays.

step 1: selection of the protection schematic sheetstep 2: corresponding accessories proposed

S

page 6

date

02/92

C23a) 27

revised

12/95

Sepam 1000or 2000

Sepam 100RT

isolatingsupervisionrelay

transformerzero sequencegeneratorMV/LV voltagetransformer with two secondary windings

earth

testing boxMV current transformer

MV voltagetransformer

resistor

MV fuse

MV circuit breaker

ring current transformer

Sepam100RT

Sepam

P1

grounding platefor THR

voltage testlamp

MV load switch

MV contactor

earth switch

MV motor

MV generator

MV capacitor

THR

SYMBOLS USED

ANSI CODE LEXICON 27 : undervoltage32 : directional power37 : undercurrent38/49 : temperature measure46 : reverse phase / phase balance current47 : phase sequence49 : thermal image50 : instantaneous overcurrent50G : instantaneous zero sequence overcurrent on ring CT50N : instantaneous zero sequence overcurrent on CT51 : time delay overcurrent51G : time delay zero sequence overcurrent on ring CT51N : time delay zero sequence overcurrent on CT51LR : rotor jamming and too long start-up51V : overcurrent with voltage restraint59 : overvoltage59N : zero sequence overvoltage66 : number of start-ups67 : directional current67N : directional zero sequence81 : maximum or minimum frequency87B : busbars differential87G : generator differential87L : line differential87M : motor differential87REF : restricted earth fault differential87T : transformer differential74/94 : transformer monitoring

MV line protection