GE IAC53A Manuel utilisateur

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1

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5

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INSTRUCTIONS

GEH-1788L

TIME

OVERCURRENT

RELAYS

TYPES

IAC53A

IAC53R

IAC53B

IAC54A

IAC53C

IAC54B

GENERALf)

ELECTRIC

GEH-1788 Tvne

IAC

Time

Overcurrent Relay

TOP PIVOT

TAP PLUG

TAP

BLOCK

SEAL-IN

UNIT

HOLDING

---

TIME

DltlL

COIL

SEAL-IN

DISK SHAFT

TARGET

MAIN

SEAL-IN

._--

MOVING

UNIT CONTACT

STATIONARY

CONTACT, MA:N

LEFT

STATIONARY

BRUSH

AND

SEAL-I

N--

CONTACT

UNIT

ASSEMBLY

STATIONARY

CONTACT, MAGNET

RIGHT DISK

SEAL-IN

MOVING

CONTACT

ASSEMBLY

Fig. I

The

Induction

Unit

for

Type

lAC

Relays (Front

View)

DISK

AND

SHAFT---

LOWER

.'

JEWEL

SCREwj

COIL

ANO

TAP

BLOCK

-

ASSEMBLY

Fig. 2

The

Induction Unit for

Type

lAC

Relays

(Rear

View)

-

Ltl

~

C'-I

C'-I

0

00

c,

u....

Ltl

00

C'-I

Ltl

(V)

o

00

L.

(I)

>

o

<..)

TIME

OVERCURRENT RELAYS

TYPE

lAC

INTRODUCTION

Type

Contact

Instan.

A-C

Trip

Induc.

Outline

lnt.

Circuits

Unit

IAC53A(-)A

One

No

IAC53B(-~A

One

Yes

IAr.53C(-

A One No

JAC53R(-)A

One

Yes

IAC54A~-~A

Two

No

IAC54B - A

Two

Yes

The

Types

IAC53

and

IAC54

relays

are

time

overcurrent

relays

with

a

very-inverse

time

char-

acteristic.

They

are

employed

to

protect

against

overcurrent

on

single-phase

and

poly-phase

circuits.

The

various

relays

described

in

this

instruction

book

differ

in

the

number

of

circuits

they

close,

and

if

an

instantaneous

unit

and/or

an

a-c

tripping

unit

is

included.

These

relays

consist

of

an

induction

unit

or

an

induction

unit

with

an

instantaneous

unit

which

per-

Unit Unit

&P.

D.

Conn.

No

One

Fig.

20

Fig.

12

No

One

Fig.

20

Fig.

13

Yes

On~

Fie:. 20

Fig.

14

Yes

One

Fig.

20

Fig.

15

No

One

Fig.

20

Fig.

16

No

One

'Fig.

20

Fig.

17

.-

mits

instantaneous

tripping

for

exteremely

high

cur-

rents,

or

an

induction

unit

with

an

a-c

tripping

unit

for

use

where

d-c

power

is

unavailable

or

a-c

tripping

is

preferred.

Since

practically

all

Type

IAC

relays

are

composed

of

various

combinations

of

the

above

(that

is,

the

induction

unit,

the

instantaneous

unit

and

the

a

-c

tripping

unit),

they

are,

for

convenience,

describ-

ed

separately

in

the

following

text.

The

above

table

indicates

the

units

comprising

each

type

and

also

lists

the

internal

connections

and

outline

and

panel

drilling

diagrams.

INDUCTION

UNIT

INTRODUCTION

APPLICATION

The

induction

unit

is

the

basic

unit

in

all

Type

JAC

relays.

Figs.

1

and

2

show

the

induction

unit

mounted

in

the

cradle.

These

units

are

of

the

induc-

tion-disk

construction

type.

The

disk

is

actuated

by a

current

operating

coil

on a

laminated

U-magnet.

The

disk

shaft

carries

the

moving

contact

which

completes

the

alarm

or

trip

circuit

when

it

touches

the

station-

ary

contact

or

contacts.

The

disk

shaft

is

restrained

by a

spiral

spring

to

give

the

proper

contact-closing

current

and

its

motion

is

retarded

by a

permanent

magnet

acting

on

the

disk

to

give

the

correct

time

delay.

There

is

a

seal-in

unit

mounted

on

the

front

to

the

left

of

the

shaft.

This

unit

has

its

coil

in

series

and

its

contacts

in

parallel

with

the

main

contacts

such

that

when

the

main

contacts

-close

the

seal-in

unit

picks

up

and

seals

in.

When

the

seal-in

unit

picks

up,

it

raises

a

target

into

view

which

latches

up

and

remains

exposed

until

released

by

pressing

a

button

beneath

the

lower

left

corner

of

the

cover.

The

induction

unit

is

the

main

unit

in

all

Type

JAC

relays,

supplying

the

very

inverse

time

delay

characteristics

of

the

relay

and

sounding

an

alarm

or

tripping

the

breakers

for

overload

currents

which

cause

it

to

close

its

contacts.

OPERATING

CHARACTERISTICS

The

induction

unit

may

have

one

or

two

circuit-

closing

contacts

which

close

as

the

current

increases

to

the

pick-up

value

as

set

on

the tap

block.

The

time

delay

in

closing

the

contacts

is

determined

by

the

setting

of

the

time

dial

(Fig.

1).

The

time-cur-

rent

characteristics

are

shown

in

Fig.

3.

RATINGS

The

induction

unit

is

designed

to

use

anyone

of

four

operating

coilS,

each

having

a

different

com-

bination

of

taps

as

follows,

4,5,6,7,8,10,12,

and

16

amperes;

1.5,2.0,

2.5,

3.0,

4.0,

5.0

and

6.0

amperes;

0.5,

0.6,

0.8,

1.0, 1.2, 1.5

and

2.0

amperes;

0.1,

0.12, 0.16,

0.2,

0.24,

0.3

and

0.4

amperes.

These

instructions

do

not

purport

to

cover

all

details

or

variations

in

equipment

nor

to

provide

for

,}very

possible

contingency

to

be

met

in

connection

with

installation,

operation

or

maintenance.

Should

further

information

be

desired

or

should

particular

problems

arise

which

are

not

covered

sufficiently

for

the

purchaser's

purposes,

the

matter

should

be

referred

to

the

General

Electric

Company.

To

the

extent

required

the

products

described

herein

meet

applicable

ANSI,

IEEE

and

NEMA

standards;

but

no

such

assurance

is

gi

ven

wi

th

respect

to

local

codes

and

ordinances

bec~use

they

vary

greatly.

3

GEH-1788 Type IAC Time

Overcurrent

Relay

4

......

•

.•.

7

.•.•

1

""

ODD

IDO

7.

IDO

SOl

..

NO

,

..

to

..

71

to

H

41

"

It

•

•

•

7

•

•

4

I

1

1

..

..

.7

..

..

..

.1

.1

.1

••

..

•

t1

I

..

..

...

.n

.n

oRA

HHGS

TIME

UNIT

0·5-4.0

1.5-12.0

2-16

1

..

.I

.•.

J 0

•••

1

I I 4 • • 1 • "

I

I

~

STUN I T

0.5-4.0

2-

16

10-80

20-160

\\\

~\\\

~\~

~

~

\

\\

\.\

\

\\

\\~\

I.

\ \

~

1\

\

,',-

l'-

\ \ \

[\1'

1\

1\

\

f'1'

1\

1\

1\

1\

1'1'

-• I I •

lUll

-

I

I·

I I I

EXTEI':DEC

PHH

(8GO

WlIE~)

TII·IE

UNIT

TAPS

G.

5,0.

6,0.7)

0.8,

1.0)

I

.2)

I.

5

.•

2.0,

2·

5)

3·

0)

4. 0

1.5)2.0,2.5)3.0,4.0,5.0,6.0)7.0)8.0}IO)

12

2.0,2.5,3.0)

4.0,5.0)6.0)7.0,8.0}

10.0} 12)

16

-

r:::::::

t"

~

r--

r-

10

9

S

""

r-

7

til

I

...........

t--

6

til

5 c

-

.-

-

4 -

"

r--

VJ

r--......,

3

--

r--

'0

2 0

"

r--

r--

r-t--

E

o-

r

I-

~

I I I I

11111

I I i

'"'-

ADJUSmEHTS

IHST. UNIT

COHTI

HUOUSLY

AVJUSTABLE

-

1

l1li

III

III

7

•

III

Ito

-

1

II

..

..

7I

..

It

..

20

1

•

•

,.

•

•

4

•

I

1

4

.z

I

..

•

..7

.II

•

oM

..

.81

•

..

4

••

f I

I..

.."

..

It

7

••

!

I..

I

IIIII

I I I r

11111

MULTIPLES

OF

RELAY TAP SETTING

Figure

3

<088880270

[3])

Time-Current

Curves

for

Type IAC

Relays

with

Very-Inverse-Time

Characteristics

::I

I!i

2

I

r::-

N

Ln

N

g

e

:7

C,

u..

-

<0

~

N

N

o

00

CALI

BRATION

PLATE

ADJUSTABLE

POLE PIECE

INSTANTANEOUS

UNIT

OPERATING

COIL

TARGET

STATIONARY

CONTACTS

MOVING

CONTACT

ASSEMBLY

Fi g.

L+

Type

lAC

Relay

with

an

Instantaneous

Unit

(Front

View)

The

current-closing

rating

of

the

contacts

is

30

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:

Function

Amperes,

a-c

or

d-c

2-Amp

Tap

0.2

Amp

Tap

Tripping

Duty 30 5

Carry

Continuously

3 0.3

Operating

Range

2-30

0.2-2

Resistance

0.13

7

Impedance

at

60

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.

Type lAC Time Overcurrent Relay GEH-1788

SHORTING

COIL

MAIN

COIL

A-C

TRIPPING

UNIT

Fi

g.

S

Type

lAC

Relay

with

an

A-C

Trip

Unit

(Rear

View)

BURDENS

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

Freq.

Tap

Amps

Volt

Imp.

PF

Amps

Amps

Ohms

4-16

60

4 5

2.0

0.08 0.50

50

4 5 1.7

0.07 0.50

25 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

25

1.5

5

9.0

0.36 0.55

0.5-2

60 0.5 5

105.0

4.20

0.35

50 0.5 5

86.0

3.45

0.34

25 0.5 5

82.0

3.28

0.55

* 3050

122

0.38

0.1-0.4

60

0.1

5

50 0.1 5

2546

102

0.36

------.

INSTANTANEOUS

INTRODUCTION

UNIT

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.

When

the

current

reaches

a

predeterm:ned

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.

5

GE8-1788 Type

lAC

Time Overcurrent Relay

26

24

22

20

18

16

V

14

0

L

T 12

A

G

E 10

8

6

4

2

0

6

/ /

/ V 6

V/

~

,/

/

V

h

{/

/;,

~

.---

'vI'

/

~

----

~

./

~

I

,.

::::::::

~

---

~

~

=

~

~

---

I~

~

~

/ V

/'

V

V V

~

~/

V /

~

-:/

~

---

-

---

601'\.1

50"",

25"V

TAP

RANGE

0.5-2.0

AMPS.

601'\.1

TAP

RANGE

50"",

1.

5-6.0

A~PS

•.

25"",

TAP

60""

J

RANGE

501'\.1

4-16

251'V

AMPS.

o 2 4 6 8 10 12 14

16

18

20

MULTIPLES

OF

MINIMUM

PICK-UP

CURRENT

SATURATION

CURVES

FOR

lO~EST

TAPS

OF

INOUCTION

UNITS

ON

VERY

INVERSE

TYPE

lAC

RELAYS

Fig. 6 Saturation

Curves

for

Lowest

Taps

of tne Induction Unit of

Type

lAC

Relays with

Very-Inverse-Time

Characteristics

N

o

-

o

o

.q

>D

I

:.:

~

CI

u...

1'ype

lAC

Time Overcurrent

Relay

U~H-17aa

0.030

0.025

.

~

en

0.020

I

UJ

::I

I-

{).015

~

::l

~

u 0.010

CL

0.005

o o 1 2 4

OPERATI

NG

TIME

RANGE

FOR

~y

PICKUP

SETIING

5 6 7

MULTIPLES

Of

PICK-UP

9

10

Fig.

7A

(K-6306872

[5])

Time-Current

Characteristics

for

Original

Instantaneous

Unit

.025

t---+----+-+_

".oro

+---+---4

.oos

+--+----!-+'__..

1.5 2 B 9

10

~ULTI

PLES

OF

PICKUP

Fig.

7B (0208A869 5-1)

Time-Current

Characteristics

for

the

"Hi-Gil Unit

7

GEH-1788

Type

IAC

Time

Overcurrent

Relay

APPLICATION

The

instantaneous

unit

is

used

on

certain

Type

IAC

relay

models

to

provide

instantaneous

tripping

for

current

exceeding

a

predetermined

value.

OPERATING

CHARACTERISTICS

*

The

instantaneous

unit

operates

over

a

four-

to-one

range

and

has

its

calibration

stamped

on

a

scale

mounted

beside

the

adjustable

pole

piece.

Time-current

characteristics

are

shown

in

Fig.

7A

for

the

instantaneous

unit

used

before

1977.

In

1977

the

instantaneous

unit

was

modified

to

make

it

have

a

higher

seismic

rating.

The

new

instantaneous

unit

can

be

identified

by

the

mark-

ing

"Hi

-G"

moulded

into

the

front

mouldi

ng

jus

t

above

the

target

windows.

The

time-current

characteristic

for

the

"Hi-G"

unit

is

shown

in

Fig.

7B.

RATINGS

The

instantaneous

unit

is

designed

to

use

the

coils

listed

below;

Coil

Freq

Amp

Volt-

Imp.

P.F.

Amp

Ohms

0.5-2

60 5 360 14.4 0.74

1-4 60 5 90

3.6

0.77

2-8

60 5 22.5

0.90

0.83

25 5

8.0

0.32 0.83

4-16

60

5 5.63 0.225

0.87

50 5

4.77

0.191 0.87

40 5 3.93 0.157

0.88

25 5

2.37

0.095

0.88

7-28

60 5 1.68 0.067

0.88

10-40

60 5 0.83 0.033

0.95

50 5

0.80

0.032 0.95

25 5

0.68

0.027

0.98

20-80

60 5

0.20

0.008

0.95

50 5 0.20 0.008

0.95

25 5 0.18

0.007

0.98

A-C

TRIPPING

UNIT

INTRODUCTION

The

a-c

tripping

unit

is

a

Type

REA

relay

unit

designed

to

energize

a

circuit-breaker

trip

coil

from

its

associated

cuz:rent

transformer

upon

the

operation

of

the

main

unit

of

the

Type

IAC

relay.

It

transfers

the

current

from

the

secondary

of

the

current

transformer

into

the

trip

coil

and

removes

the

current

from

the

trip

coil

when

the

breaker

trips.

The

tripping

unit

is

mounted

on

the

rear

of

the

frame

opposite

the

tapped

operating

coil

of

the

in-

duction

unit

(see

Fig.

5).

The

operation

of

this

unit

is

illustrated

in

Fig.

11.

The

secondary

current

8 *

Indicates

revision

circulates

through

the

induction

unit

current

coil

and

the

main

coil

of

the

Type

REA

auxiliary

tripping

unit,

returning

through

the

Type

REA

contacts

to

the

cur-

rent

transformer.

Normally,

most

ofthefluxgener-

ated

by

the

main

Type

REA

coil

passes

through

the

upper

limb

of

the

magnetic

structure

and

holds

the

armature

firmly

against

this

limb.

When

the

contacts

of

the

induction

unit

close,

the

shorting

coil

of

the

Type

REA

unit

is

short-circuited

and

current

flows

in

this

coil

by

transformer

action,

causing

a

redis-

tribution

of

flux

which

actuates

the

armature

and

the

Type

REA

contacts.

The

opening

of

the

Type

REA

contacts

causes

the

secondary

current

to

flow

through

the

trip

coil

which

trips

the

breaker.

A-C

8~

S

TRIP

BLS

(-)

--.------

2

3

5 5

51-3

.a=.!

6 6

5

.llii.

H

6

-------

Figure

B

(K-6375667

[2])

External

Connections

of

Three

Type

IAC53A

Relays

Used

for

Phase-to-

Phase

and

Ground

Overcurrent

Protection

of

a

3-Phase

Circuit

A-C

BUS

Figure

9. (K6375668-1)

External

Connections

of

Three

Type

IAC53A

Relays

used

in

Conjunction

with

Tripping

Reactors

for

Protection

of

a

3-Phase

Circuit

Type

IAC

Time

Overcurrent

Relay

GEH-1788

Device

Function

Numbers

for

Use

with

ALL

51-1

External

Diagrams

50

51

51N

52

SI

TC

A

Instantaneous

Unit

Overcurrent

Relay,

Type

IAC

Ground

Overcurrent

Relay,

Type

IAC

Power

Circuit

Breaker

Seal-in

Unit,

with

Target

Trip

Coil

Auxiliary

Contact,

closed

when

breake

..

•

closes

A-C

IIJS

~

IOC

Figure

10.

(K-6375669-6)

External

Connections

of

Three

Type

IAC53R

Relays

Used

For

3-Phase

Circuit

Protection

9

GEH-l'/MM

'rype

IAC

'rime

Overcurrent

Relay

APPLICATION

The

a-c

tripping

unit

is

used

in

Type IAC

relays

where

a

reliable

direct-current

tripping

source

is

not

available

and

it

is

necessary

to

trip

the

breaker

from

the

current-transformer

secondary.

RATINGS

T6S1

BREAKER

TRIP

COIL

The

a-c

tripping

Wlit

has

a

continuous

rating

of

CURRENT

five

amperes

but

will

operate

on a

minimum

current

TRANS

of

3.5

amperes.

It

should

be

used

with

three-

ampere

trip

coils.

The

contacts

of

these

units

will

transfer

current-transformer

secondary

current

up

to

100

amperes.

For

applications

where

the

sec-

ondary

current

exceeds

100

amperes,

the

Type

REAllB

relay,

which

has

contacts

rated

200

am-

peres,

can

be

used

in conjWlction

with

Type

IAC

overcurrent

relays.

The

Type

REAllB

is

not

mOWlted

inside

the

Type IAC

case.

aURDENS

Burdens

of

the

Type REA

unit

are

given

in

the

following

table:

Impedance

PF

Volt-

Frequency

Amps

in

Ohms

Amperes

60 5 0.49

0.80

12.2

50 5 0.33

0.80

8.3

25

5 0.23 0.62 5.8 *

Fig.

II

Diagram

Illustrating

Operation

of

Type

lAC

Relays

having

an

A-C

Tripping

Unit

RECEIVING,

HANDLING

AND

STORAGE

These

relays,

when

not

included

as

a

part

of a

control

panel

will

be

shipped

in

cartons

designed

to

protect

them

against

damage.

Immediately

upon

receipt

of a

relay,

examine

it

for

any

damage

sustained

in

transit.

If

injury

or

damage

resulting

from

rough

handling

is

evident,

file

a

damage

claim

at

once

with

the

transportation

company

and

promptly

notify

the

nearest

General

Electric

Apparatus

Sales

Office.

Reasonable

care

should

be

exercised

in

Wlpack-

ing

the

relay

in

order

that

none of

the

parts

are

injured

or

the

adjustments

disturbed.

If

the

relays

are

not

to

be

installed

immed-

iately,

they

should

be

stored

in

their

original

car-

tons

in

a

place

that

is

free

from

moisture,

dust

and

metallic

chips.

Foreign

matter

collected

on

the

outside

of

the

case

may

find

its

way

inside

when

the

cover

is

removed

and

cause

trouble

in

the

operation

of

the

relay.

INSTALLATION

LOCATION

The

location

should

be

clean

and

dry,

free

from

dust

and

excessive

vibration,

and

well

lighted

to

facilitate

inspection

and

testing.

MOUNTING

*

The

relay

should

be

mounted

on

a

vertical

surface.

The

outline

and

panel

diagram

is

shown

in

Fig.

20.

CONNECTIONS

The

internal

connection

diagrams

for

the

various

10

*

Indicates

Revision

relay

types

are

shown

in

Figs.

12

to

17

inclusive.

Typical

wiring

diagrams

are

given

in

Figs.

8

to

10

inclusive.

One of

the

mounting

studs

or

screws

should

be

permanently

grounded

by a

conductor

not

less

than

No. 12 B & S

gage

copper

wire

or

its

equivalent.

INSPECTION

At

the

time

of

installation,

the

relay

should

be

inspected

fur

tarnished

contacts,

loose

screws,

or

other

imperfections.

If

any

trouble

is

fOWld,

it

should

be

corrected

in

the

manner

described

under

MAINTENANCE.