ge iac rela manual

7/23/2019 Ge Iac Rela Manual

1/16

TY

PES

N

STR

U T

O N

S

GEH

78

8L

TIM

E

O

VE

RCU

RR

ENT

REL

AY

S

GNR L

ELECTRIC

IA

C5

A

IAC

5 B

IAC

5 C

IA C

IAC

5A

IA

C54B


2/16

TOP PIVOT

TAP

PLUG

SEAL- IN

UNIT

HOLDING

COIL

SE L IN

TARGET

SE L IN

UNIT

STATIONARY

CONTACT.

FET

SE L IN

UNIT

STATIONARY

CONTACT,

RIGHT

SEAL IN

MOVING

CONTACT

ASSEMBLY

LA

GEH-1788

Tvne

I C

Time Overcurrent

Relay

TAP BLOCK

--TIME DIAL

DISK

SIIAET

MA

N

MOVING

CONTACT

MA

N

SEAT IONARY

BPUSH

AND

CONTACT

ASSEMBLY

MAGNET

Co

.4

4

Co

LI..

Fig. The

Induction Unit for Type IAC

Reays

Front

View

OISK

AND

SHAFT

LOWER

JEWEL

SCREW/

Co

Co

-.4

Co

C,

Co

II)

Fig. 2 The

Induction

Unit

for

Type IAC Relays

Rear View

2


3/16


4/16

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EH

178 8

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ype

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Tim

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Time

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Ty

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C

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s

w

ith

VeryInverse Time

haracteristics

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AY

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5/16

rype

1AC

Nme

Overcurrent

Relay

GEH-1788

CALl F3RATION

r_

PLATE

ADJUSTABLE

i

POLE

PIECE

NSTANTANEOUS

UNiT

OPERATING

COIL

TARGET

STATIONARY

CONTACTS

MOVING

CONTACT

ASSEMBLY

Fig.

Type

AC

Relay

with

an Instantaneous

Unit

Front

View

Fig.

5

Type IAC

Relay with

an

Rear View

AC

Trip Unit

UR

DE

NS

The

current closing

rating of the contacts is

3

amperes

for voltages not exceeding

250

volts.

The

current carrying

ratings

are

affected

by

the

selection

of

the tap on

the

target

and

seal in

coil

as

indicated

in the

following table:

Amperes,

a-c

or

d-c

Fun

c

ti

on

2-Amp Tap

0.2

Amp

Tap

Tripping

Duty

3

5

Carry

Continuously

0.3

Operating

Range

2-30

0.2-2

Resistance

0.13

7

Impedance at 6

cy

0.53

52

If

the

tripping

current

exceeds

30

amperes

an

auxiliary

relay

should

be

used,

the connections being

such

that the

tripping

current does

not

pass

through

the contacts

or

the target

and seal in coils

of

the

protective

relay.

INT

ROD

U

TIO

N

The instantaneous

unit is

a small instantaneous

hinge-type

unit

which

may

be

mounted

on

the right

front

side

of

the induction

unit See Fig.

4 . Its

contacts

are normally

connected in

parallel

with

the

contacts

of

the

main

unit.

Its coil

is

connected

in

series

with

the operating

coil

of

the

main unit.

Burdens for

the standard

coils

are

given in

the

following

table.

These

are calculated burdens at

five

amperes

based

on

burden

of

minimum

tap.

Volt-ampere burdens

for

the

lowest

tap

on

any

of the

three

coils

can be

determined

for any value

of

current

up to

20 times

tap setting, from

Fig.

6

Coil Volt

Imp.

PF

Amps

Freq. Tap Amps

Amps

Ohms

4-16

60

4 5

2.0

0.08

0.50

50

4

5

1.?

0.07

0.50

5

4

5

1.3

0.05

0.61

1.5-6 60

1.5

5

14.5

0.58

0.42

50

1.5

5

12.0

0.48

0.42

5

1.5 5

9.0 0.36 0.55

0.5-2

60 0.5

os o

4.20

0.35

50

0.5

5

86.0

3.45

0.34

5

0.5

5

82.0

3.28

0.55

*

0 1

5

3050

122

0.38

0.1-0.4

50

0 1

5

2546

102

0.36

When

the current

reaches a predetermined

value,

the instantaneous

unit operates

closing

the

contact

circuit

and

raising

its

target

into view.

The

target

latches

in

the exposed

position until

released

by

pressing

the

button

beneath

the lower

left-hand

corner

of

the

relay cover.

1

C.,

LI

0

C.

C.,

LL

IN

ST

NT

N

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U

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TAP

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UCT

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UN

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F

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2

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0

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P

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1

5

6 0

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PS

T

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R

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4

16

AMP

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4

2

50

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6

5

0

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Tim

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Over

curr

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Rel

ay

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T

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unit

i

s

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ain

Ty

pe

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C

r

elay

m

ode

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in

stant

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us

trip

ping

fo

r

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ent

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ng a

pre

dete

rmin

ed

v

alue

.

OP

ER

TIN

G

H

R

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Th

e

in

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it

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t

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has its

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ratio

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sta

mpe

d

on

a s

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mou

nted

bes

ide

the

a

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table

po

le pi ec

e

Tim

ec

urre

nt

hr

teri

sti s

ar e s

how

n

in

Fig

for

th

e

ins

tant a

neo

us

un it

u

sed be f

or e

97

7

In

977

the

in

st an

ta neo

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u

nit

w

as

m

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to

m

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h

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a

high

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e

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in st

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s

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t

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t

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nit is

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F

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7

RTINGS

T

he

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unit

i

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sign

ed

to

us

e

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coil

s lis

ted

be

low;

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0.5-

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C

T

R

PP

N

UN

IT

INT

ROD

U

TION

T

he

a-

c tr

ippin

g

un

it

is

a T

ype R

EA relay u

nit

de

sign

ed

to

en

ergiz

e

a

circ

uit-b

reak

er

trip

co

il

fro

m

its

a

ssoc

iated

cur

rent tra

nsfo

rme

r

u

pon th

e

o

pera

tion o

f the

ma

in

unit

of th

e Ty

pe

IAC

relay

.

It

tr

ansf

ers t

he c

urre

nt from t

he

seco

ndar

y of

the

c

urre

nt

tra

nsfo

rme

r

into

the t

rip c

oil

and

remo

ves

th

e

curr

ent

f

rom

t

he

t

rip

co

il

whe

n

th

e

b

reak

er

trips

.

Th

e

tri

ppin

g

u

nit is m

oun

ted

on

the r

er

of

th

e

fram

e

opp

osite th

e

tap

ped

op

erati

ng

coil

of

the

duc

tion

u

nit see

F

ig.

5

.

T

he

o

pera

tion o

f

th

is uni

t

is

illu

strat

ed

in Fig

.

1

1

T

he

s

econ

dary

curr

ent

cir

cula

tes

t

hrou

gh t

he in

duc

tion

u

nit

c

urre

ntco

Uan

d

the

main

coil

of

the

Type

REA

auxiliary

tripping

unit

re

turn

ing

th

roug

h th

e Ty

pe

R

EA

con

tacts

to

th

e

ur

ren t

trans

form

er.

N

orm

ally

m

ost of

th

e

f

lux

g

ener

ate

d

by t

he m

ain

Typ

e R

EA

coil

pas

ses t

hrou

gh

the

up

per

l

imb

of the

m

agn

etic

stru

ctur

e

an

d

hol

ds

the

ar

matu

re

fi

rmly ag

ains

t th

is lim

b. Wh

en

t

he

con

tacts

of t

he ind

ucti

on

u

nit

cl

ose

th

e

s

hort

ing

co

il of th

e

Ty

pe

RE

A

uni

t

is

s

hort-

circu

ited

a

nd

cur

rent

flow

s

in

thi

s coil

by

tran

sform

er

acti

on

c

ausin

g a

re di

s

tribu

tion of

flux

whi

ch act

uates

the

arm

atu

re

and

th

e

T

ype

REA

con

tacts

.

The

o

pen

ing of

th

e Ty

pe

R

EA

con

tacts

cau

ses the

se

cond

ary

cur

rent

t

o

fl

ow

th

roug

h

the

trip c

oil whic

h

trips

th

e

bre

aker

.

8

Indi

cate

s

revi

sion


9/16

U

Typ

e

IAC

T

im

e O

ve

rc

ur

re

nt R

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ay

GE

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F

igu re

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375

667

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E

xt

er

na

l C

on

ne

ct

ion

s

of

T

h

re

e Type

IA

C5

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R

ela

y

s Us

ed

f

or P

ha

se

t

o

P

ha

se

an

d

G

roun

d

O

ve

rc

ur

re

nt P

ro

te

cti

on

o

f

a

3

Ph

ase

C

irc

ui

t

S

Figure

9.

K6375668-1

External

Connections

of

T

h

re

e

Ty

pe

IAC

53A

R

e

la

ys

u

sed in

Co

nj

un

ct

io

n

w

it

h

T

ri

pp

in

g

R

ea

ct

or

s

fo

r P

ro

te

cti

on

of

a 3

P

h

as

e

C

irc

ui

t

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ev

ic

e

F

un

ct

ion Nu

m

be

rs

f

or

Use

with

A

LL

E

x

ter

na

l Di

ag

ra

m

s

5

5

SIN

52

SI

TC

A

In

st

an

tan

e

ou

s

U

nit

Overcurrent

Relay Type

I

G

rou

nd

O

ve

rc

ur

re

nt R

el

ay

Typ

e

IAC

P

ow

e

r Ci

rc

uit

B

r

ea

ke

r

S

ea

l

in

Un

it,

wit

h

Ta

rg

et

T

rip

Coi

l

A

u

xi

lia

ry C

on

tac

t c

lo

se

d

w

hen

b

re

ak

er cl

os

es

Figure

10.

K-6375669-6

External

Connections of

T

h

ree

Ty

pe

IA

C53

R

R

el

ay

s

U

se

d

F

o

r 3

P

ha

se

Ci

rc

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P

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6

ge iac rela manual

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