GE IAC57A Manuale utente

GEI

19959

INSERT

BOOKLET

GEH

1753

INSTRUCTIONS

LONG

TIME

OVERCURRENT

RELAYS

TYPES

IAC

and

IAC

INTRODUCTION

This

booklet

with

Insert

Book

GEH

1753

forms

the

instructions

for

the

Type

IAC

and

IAC

relays

The

IAC

and

IAC

relays

are

similar

the

Type

IAC

and

IAC

relays

respectively

except

that

some

the

parts

have

been

altered

provide

longer

operating

times

Typical

time

current

curves

for

these

relays

are

shown

Figure

this

booklet

The

one

second

and

continuous

current

ratings

for

these

relays

are

listed

Table

TABLE

CURRENT

RATINGS

SECOND

CONTINUOUS

RELAY

RANGE

10.0

20.0

5.0

8.0

1.5

3.5

250

1.5

0.5

200

The

outline

and

panel

drilling

dimensions

for

these

relays

are

shown

Figure

GEH

1753

The

internal

connection

diagram

for

IAC

Figure

and

for

IAC

Figure

GEH

1753

These

instructions

not

purport

cover

all

details

variations

equipment

nor

provide

for

every

possible

contingency

met

connection

with

installation

operation

maintenance

Should

further

information

desired

should

particular

problems

arise

which

are

not

covered

sufficiently

for

the

purchaser

’

purposes

the

matter

should

referred

the

General

Electric

Company

the

extent

required

the

products

described

herein

meet

applicable

ANSI

IEEE

and

NEMA

standards

;

but

such

assurance

given

with

respect

local

codes

and

ordinances

because

they

vary

greatly

Courtesy of NationalSwitchgear.com

GEI

19959

irtui

HlHffl

mill

Tinag

MULTIPLES

RELAY

TAP

SETTING

Figure

(

0888

0272

[

]

)

Typical

Time

Current

Characteristic

Type

IAC

Relays

(

300

)

GENERAL

ELECTRIC

METER

AND

CONTROL

BUSINESS

DEPT

MALVERN

19355

Courtesy of NationalSwitchgear.com

GEH

1753

INSTRUCTIONS

TIME

OVERCURRENT

RELAYS

TYPES

IAC

GENERAL

ELECTRIC

Courtesy of NationalSwitchgear.com

GEH

1753

Time

Overcurrent

Relays

Type

IAC

TOP

PIVOT

TAP

]

BLOCK

TAP

PLUG

SEAL

UNIT

HOLDING

COIL

•

TIME

DIAL

SEAL

TARGET

;

DISK

SHAFT

SEAL

UNIT

STATIONARY

CONTACT

LEFT

MAIN

MOVING

SHAFT

MAIN

STATIONARY

BRUSH

AND

CONTACT

ASSEMBLY

SEAL

UNIT

STATIONARY

CONTACT

RIGHT

SEAL

i N

MOVING

CONTACT

ASSEMBLY

DISK

STHI

CTIOMK

;

(

TAMIL

’

UNIT

DRAG

MAGNET

(

8006996

)

Front

View

CRADLE

DISK

AND

SHAFT

COIL

MAGNET

AND

TAP

BLOCK

LASSEMBLY

LOWER

JEWEL

SCREW

(

8006997

)

Rear

View

Figure

The

Induction

Unit

for

Type

IAC

Relays

Courtesy of NationalSwitchgear.com

TIME

OVERCURRENT

RELAYS

TYPE

IAC

INTRODUCTION

Contact

Circuits

Instantaneous

Unit

Trip

Outline

Panel

Drilling

Induction

Unit

Internal

Connection

Type

Unit

One

Two

IAC

(

)

IAC

(

)

IAC

(

)

LAC

(

)

IAC

(

)

One

Fig

Yes

The

Type

IAC

relays

comprise

group

relays

that

are

employed

protect

against

overcurrent

single

phase

and

polyphase

circuits

The

various

relays

this

IAC

group

are

identified

model

numbers

and

the

relays

differ

the

number

circuits

they

the

length

time

delay

and

features

that

are

determined

the

characteristics

the

protected

circuit

These

relays

consist

induction

unit

induction

unit

with

instantaneous

unit

which

permits

instantaneous

tripping

for

extremely

high

currents

induction

unit

with

tripping

unit

for

use

where

power

unavailable

tripping

preferred

Since

practically

all

IAC

relays

are

composed

various

combinations

the

above

that

the

induction

unit

the

instantaneous

unit

and

the

tripping

unit

they

are

for

con

venience

described

separately

the

following

text

The

above

table

indicates

the

units

comprising

each

type

and

also

lists

the

internal

connections

and

out

line

and

panel

drilling

diagrams

INDUCTION

UNIT

INTRODUCTION

APPLICATION

The

induction

unit

the

main

unit

all

IAC

relays

supplying

the

inverse

time

delay

character

istics

the

relay

and

sounding

alarm

tripping

the

breakers

for

overload

currents

which

cause

its

contacts

The

induction

unit

the

basic

unit

all

IAC

relays

Fig

shows

the

induction

unit

mounted

the

cradle

These

units

are

the

induction

disk

construction

type

The

disk

actuated

current

operating

coil

laminated

magnet

The

disk

shaft

carries

the

moving

contact

which

completes

the

alarm

trip

circuit

when

touches

the

station

ary

contact

contacts

The

disk

shaft

restrained

spiral

spring

give

the

proper

contact

closing

current

and

its

motion

retarded

permanent

magnet

acting

the

disk

give

the

correct

time

delay

OPERATING

CHARACTERISTICS

The

induction

unit

may

have

one

two

circuit

closing

contacts

which

the

current

increases

the

pick

value

set

the

tap

block

The

time

delay

closing

the

contacts

determined

the

setting

the

time

dial

(

Fig

)

The

time

current

characteristics

are

shown

Fig

There

seal

unit

mounted

the

front

the

left

the

shaft

This

unit

has

its

coil

series

and

its

contacts

parallel

with

the

main

contacts

such

that

when

the

main

contacts

the

seal

unit

picks

and

seals

seal

unit

picks

raises

target

into

view

which

latches

and

remains

exposed

until

released

pressing

button

beneath

the

lower

left

corner

the

cover

RATINGS

The

induction

element

designed

use

any

one

three

operating

coils

each

having

different

combination

taps

follows

and

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

peres

When

the

These

instructions

not

purport

cover

all

details

variations

equipment

nor

provide

for

every

possible

contingency

met

connection

with

installation

operation

maintenance

further

information

desired

should

particular

problems

arise

which

are

not

covered

sufficiently

for

the

purchaser

purposes

the

matter

should

referred

the

General

Electric

Company

the

extent

required

the

products

described

herein

meet

applicable

ANSI

IEEE

and

NEMA

standards

;

but

such

assurance

given

with

respect

local

codes

and

ordinances

because

they

vary

greatly

Should

Courtesy of NationalSwitchgear.com

GEH

1753

Time

Overeurrent

Relays

Type

IAC

Xvs

fcd

SOg

MULTIPLES

RELAY

TAP

SETTING

(

0888

0269

[

]

)

Time

current

Curves

Type

IAC

Relays

with

Inverse

time

Characteristics

Fig

Courtesy of NationalSwitchgear.com

Time

Overcurrent

Relays

Type

IAC

GEH

1753

The

current

closing

rating

the

contacts

amperes

for

voltages

not

exceeding

250

volts

The

current

carrying

ratings

are

affected

the

selection

the

tap

the

target

and

seal

coil

indicated

the

following

table

BURDENS

Burdens

for

the

standard

coils

are

given

the

following

table

These

are

calculated

burdens

five

amperes

based

burden

minimum

tap

Volt

ampere

burdens

for

the

lowest

tap

any

the

three

coils

can

determined

for

any

value

current

times

tap

setting

from

Fig

DUAL

RATED

0.2

2.0

0.6

2.0

0.2

2.0

0.6

3.5

Carry

amps

for

(

sec

)

Carry

amps

for

(

sec

)

Carry

continuously

(

amp

)

Minimum

operating

(

amp

)

Minimum

dropout

resistance

hertz

impedance

hertz

impedance

0.05

2.2

0.5

Coil

Amperes

Volt

Amps

Imp

Ohms

0.45

5.0

Freq

Tap

0.37

2.3

1.2

2.6

0.2

2.0

0.6

2.0

4.0

(

amp

)

(

ohms

)

(

ohms

)

(

ohms

)

0.05

0.5

0.15

8.8

0.5

0.35

0.29

8.3

0.24

0.78

0.18

4.0

0.32

8.0

0.31

0.65

6.2

0.65

4.0

7.5

0.30

0.36

0.54

5.1

0.54

1.5

6.0

1.5

59.0

2.36

0.26

1.5

the

tripping

current

exceeds

amperes

auxiliary

relay

should

used

the

connections

being

such

that

the

tripping

current

does

not

pass

through

the

contacts

the

target

and

seal

coils

the

protective

relay

52.0

2.08

0.28

1.5

48.0

1.92

0.34

0.5

2.0

0.5

530.0

470.0

430.0

21.2

0.26

0.5

18.8

0.28

0.5

17.2

0.34

TAP

RANGE

0.5

2.0

TAP

RANGE

1.5

6.0

AMPS

TAP

RANGE

AMPS

MULTIPLES

MINIMUM

TAP

SETTING

SATURATION

CURVES

VARIOUS

FREQUENCIES

FOR

TAP

RANGES

THE

TYPE

RELAY

LOWEST

TAP

USED

ALL

CASES

Fig

(

6306891

)

Saturation

Curves

for

Lowest

Taps

the

Induction

Unit

Type

IAC

Relays

with

Inverse

time

Characteristics

Courtesy of NationalSwitchgear.com

GEH

1753

Time

Overcurrent

Relays

Type

IAC

TRIP

BUS

IrJ

DEVICE

FUNCTION

NUMBERS

FOR

USE

WITH

ALL

EXTERNAL

DIAGRAMS

Instantaneous

Unit

Overcurrent

Relay

Type

IAC

Ground

Overcurrent

Relay

Type

IAC

Power

Circuit

Breaker

Seal

Unit

with

Target

Trip

Coil

Auxiliary

contact

closed

when

breaker

closes

Fig

(

6375667

)

Type

IAC

Relays

used

for

Phase

and

Ground

Overcurrent

Portection

Phase

Circuit

External

Connections

Three

BUS

TRIPPING

BXx

‘

UNIT

112

lira

ilrl

ACTOR

Fig

(

6373669

)

External

Connections

Three

Type

IAC

Relays

used

for

Phase

Circuit

Protection

Fig

(

6373668

)

External

Connections

Three

Type

IAC

Relays

used

Conjunction

with

Tripping

for

Protection

aTThree

Phase

Circuit

Reactors

Courtesy of NationalSwitchgear.com

Time

Overcurrent

Relays

Type

IAC

GEH

1753

INSTANTANEOUS

UNIT

INTRODUCTION

mounted

beside

the

adjustable

pole

piece

Time

current

characteristics

are

shown

Fig

The

instantaneous

unit

small

instantaneous

hinge

type

unit

which

may

mounted

the

right

front

side

the

induction

unit

(

See

Fig

)

Its

contacts

are

normally

connected

parallel

with

the

contacts

the

main

unit

Its

coil

connected

series

with

the

operating

coil

the

main

unit

When

the

current

reaches

predetermined

value

the

instantaneous

unit

operates

closing

the

contact

circuit

and

raising

its

target

into

view

The

target

latches

the

exposed

position

until

released

pressing

the

button

beneath

the

lower

left

hand

corner

the

relay

cover

RATINGS

The

instantaneous

unit

designed

use

either

two

coils

having

pickup

ranges

and

amperes

respectively

The

current

closing

rating

the

contacts

amperes

for

voltages

not

exceeding

250

volts

BURDENS

Burden

data

the

instantaneous

unit

coils

are

given

the

following

table

APPLICATION

Imp

Ohms

Volt

Coil

Freq

Amp

The

instantaneous

unit

used

certain

IAC

relay

models

provide

instantaneous

tripping

for

current

exceeding

predetermined

value

0.83

0.033

0.032

0.027

0.008

0.007

0.95

0.80

0.95

0.65

0.98

OPERATING

CHARACTERISTICS

0.21

0.95

The

instantaneous

element

operates

over

range

and

has

its

calibration

stamped

scale

0.20

0.95

0.15

0.98

CALIBRATION

PLATE

ADJUSTABLE

POLE

PIECE

INSTANTANEOUS

UNIT

OPERATING

COIL

SHORTING

COIL

CONTACTS

TARGET

STATIONARY

CONTACTS

MAIN

COIL

MOVING

CONTACT

ASSEMBLY

TRIPPING

KAl

UNIT

‘

Tll

MPCN

OCT

(

Fig

(

8006998

)

Type

IAC

Relay

with

Instantaneous

Unit

Fig

(

8007060

)

Type

IAC

Relay

with

Tripping

Unit

Courtesy of NationalSwitchgear.com

GEH

1753

Time

Overcurrent

Relays

Type

IAC

TRIPPING

UNIT

INTRODUCTION

The

tripping

unit

Type

REA

relay

unit

designed

energize

circuit

breaker

trip

coil

from

its

associated

current

transformer

upon

the

operation

the

main

unit

the

IAC

relay

transfers

the

current

from

the

secondary

the

current

trans

former

into

the

trip

coil

and

removes

the

current

from

the

trip

coil

when

the

breaker

trips

The

tripping

unit

mounted

the

rear

the

frame

opposite

the

tapped

operating

coil

the

induction

unit

(

see

Fig

)

The

operation

this

unit

illustrated

Fig

The

secondary

current

circulates

through

the

induction

unit

current

coil

and

the

main

coil

the

REA

auxiliary

tripping

unit

returning

through

the

REA

contacts

the

current

transformer

Normally

most

the

flux

generated

the

main

REA

coil

passes

through

the

upper

limb

the

magnetic

structure

and

holds

the

armature

firmly

against

this

limb

When

the

contacts

the

induction

unit

the

shorting

coil

the

REA

short

circuited

and

current

flows

this

coil

transformer

action

causing

redistribution

flux

which

actuates

the

armature

and

the

REA

contacts

The

opening

the

REA

contacts

causes

the

secondary

current

flow

through

the

trip

coil

which

trips

the

breaker

BREAKER

TRIP

COIL

CURRENT

TRANS

TRIP

UNIT

NORMALLY

CLOSED

CONTACTS

IOC

LQC

TRIP

UNIjT

SHORTING

COIL

TRIP

UNIT

MAIN

COIL

TOC

Fig

(

6154766

)

Diagram

Illustrating

Operation

Type

IAC

Relays

having

Tripping

Unit

0.030

OPERATING

TIME

RANGE

FOR

ANY

PICKUP

SETTING

0.025

0.020

0.015

0.010

0.005

MULTIPLES

PICK

(

6306872

[

]

)

Time

current

Characteristics

o f

Original

Instantaneous

Unit

Fig

Courtesy of NationalSwitchgear.com

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