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 protection2.8 MV transformer protection2.9 MV motor protection2.10 MV generator protection2.11 MV capacitor bank protection2.12 MV bus tie protection

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

2.13 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)

date

10/94

C23a)212

revised

12/95

MV bus section protection

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

MV bus section protection

page 2

date

10/94

C23a)212

revised

12/95

see page 3 see page 3

see page 3

see page 3 see page 3

see page 3

type oftransformer

control by

configuration

UNGROUNDED NEUTRAL

remote transmission

Sepam1000

RESISTANCE GROUNDING upstream

of MV incomers

ZERO SEQUENCE GENERATOR

grounding on busbars

Sepam2000

Sepam1000

Sepam2000

Sepam1000

Sepam2000

without MG (JBus)remote transmissionwithout MG (JBus)

remote transmissionwithout MG (JBus)

withdrawablecircuit breaker (2)fixed circuit breaker (1)withdrawablecircuit breaker (2)fixed circuit breaker (1)withdrawablecircuit breaker (2)fixed circuit breaker (1)

MV

BUS

SECT

ION

/ BS01 / BS11 / BS04

BS07 BS02 BS12 BS10 BS08 BS05

/ / / /

/ /

/ / /

/ BS03 / BS09 / BS06

/

+

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.

+

Remarks:MV motor feeder with Sepam 1000: undervoltage protection (27) load shedding is notinstalled as standard on each MV motor feeder; it does not exist at present for the Sepam 1000motor (refer to MV motor protection guide, chapter C-2-3 a)2.9 and documentation Sepamrange ref. AC0401/1E page 13 of the 07/94). In this case, the protection (27) is installed inthe bus section; a Sepam 1000 busbar per half busbar BB1 and BB2. The informationload shedding by undervoltage (27) is sent by LV circuits to each MV motor feeder equippedwith a Sepam 1000.MV motor feeder with Sepam 2000: undervoltage protection (27) load shedding is installedas standard on each MV motor feeder (refer to MV motor protection guide, chapter C-2-3 a)2.9).intercubicle locking and source transfer: intercubicle locking between the incomers andbus section is of type 2 on 3, with no possibility of incomer parallel connection. If you wish forautomatic source and/or busbar earth leakage transfer (87B), refer to MT partenaire, binderC, chapter C-2-3 a)2.14 entitled additional information on specific protection devices.

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).

page 3

date

10/94

C23a)212

revised

12/95

MV bus section protection

SELECTION TABLE: MV bus sectionwith 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

step 1

ste

p 1

ste

p 2

MV

BUS

SECT

ION

DM1

(3)

type oftransformer

controlby

configuration

RI

with

relea

se (1

)

with

relea

se (2

)

manual moto.

JBus without remote transmission

Sepa

m 2

000

Sepa

m 1

000

Sepa

m 1

00RT

LV comptstype of control

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 cu

bicle

low

volta

ge c

ompa

rtmen

t 100

mm

RESISTANCE GROUNDING

upstreamof MV incomers

JBus without remote transmissionSe

pam

200

0

Sepa

m 1

000

Sepa

m 1

00RT

UNGROUNDED NEUTRAL

B B B O O O

B B B O O O

OB B B O O O

B B B O O O

auxiliary contacts

8 8

BS13 BS16

BS14 BS17

BS15 BS18

BS19 BS20BS19 BS20

O = Optional extraB = Basic proposal

note (1): shunt trip opening release. note (2): opening and closing release.note (3): bus section can be made with the following SM6 cubicles:

CM + DM1-D + GBC-Aor CM + DM1-D with TT (optional) or CM + DM2*-D with TT (optional)

*Important: the single-wire representation of a DM2 cubicle is different from the one proposedin these pages (refer to the SM6 range documentation, reference AC0356/1E).

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 bus section protection

page 4

date

10/94

C23a)212

revised

12/95