GE IAC55A Manuale utente

INSTRUCTIONS

GEI

31010

INSERT

BOOKLET

GEH

1753

SUPERSEDES

GEI

31010

SHORT

TIME

OVERCURRENT

RELAYS

IAC

These

instructions

not

purport

cover

ell

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

sufficientJy

for

the

purchaser

purposes

the

matter

should

referred

the

General

Electric

Company

Should

the

extent

required

the

products

described

herein

meet

applicable

ANSI

IEEE

and

NEMA

standards

;

hut

such

assurance

given

with

respect

local

codes

and

ordinances

because

they

vary

greatly

GENERAL

ELECTRIC

Courtesy of NationalSwitchgear.com

GEI

31010

Short

Time

Overcurrent

Relays

Type

IAC

•

56780

1 0

3 0

4 0

5 0

6 0

7 0

8 0

9 0

MULTIPLES

RELAY

TAP

SETTING

Figure

(

0888

0271

)

Typical

Time

Current

Curves

For

Type

IAC

Relays

Courtesy of NationalSwitchgear.com

GEI

31010

SHORT

TIME

OVERCURRENT

RELAYS

TYPES

IAC

AND

INTRODUCTION

Types

IAC

and

are

the

same

general

construction

Types

IAC

and

respectively

been

altered

how

described

the

included

instructions

GEH

1753

Some

the

parts

these

relays

ever

give

short

operating

times

The

most

obvious

the

changes

are

that

the

magnet

mounted

the

opposite

side

and

the

spiral

cut

out

the

disk

has

been

omitted

The

former

little

importance

but

the

latter

means

that

there

compensation

for

the

windup

the

control

spring

This

means

that

current

required

the

operating

coil

the

contacts

than

start

the

disk

turning

from

the

timing

position

This

ratio

approximately

1.4

and

will

not

much

importance

the

applications

which

this

relay

usually

applied

Since

these

relays

operate

very

high

torque

level

they

are

supplied

with

locked

time

dial

prevent

any

possible

change

setting

due

this

high

torque

change

time

dial

setting

loosen

the

two

screws

the

dial

hub

turn

the

time

dial

the

described

setting

and

retighten

the

screws

Typical

time

current

curves

for

these

relays

are

shown

Fig

this

instruction

book

Outline

and

panel

drilling

well

internal

connections

for

these

relays

are

found

the

included

instructions

GEH

1753

and

Table

follows

TABLE

OUTLINE

AND

PANEL

DRILLING

INTERNAL

CONNECTION

TYPES

IAC

(

)

IAC

(

)

IAC

(

)

Fig

(

This

Supplement

)

Fig

BURDENS

Burdens

for

the

time

overcurrent

unit

are

given

Table

TABLE

RANGE

MIN

BURDENS

MIN

PICKUP

MIN

TAP

BURDENS

OHMS

(

)

AMPS

CALCULATED

FROM

IMPEDANCE

MIN

PICKUP

TAP

20.0

TIMES

PICKUP

TIMES

PICKUP

TIMES

PICKUP

0.5

13.4

0.5

51.6

49.8

21.6

46.6

13.5

1290

1.5

5.55

5.75

2.4

1.5

144

5.2

0.23

0.78

0.81

0.73

0.34

0.21

NOTE

The

impedance

values

given

are

those

for

minimum

tap

each

relay

the

impedance

for

other

taps

pick

current

(

tap

rating

)

varies

inversely

(

approximately

)

the

square

the

tap

rating

For

example

relay

with

0.5

amp

range

the

impedance

0.5

amp

tap

given

51.6

ohms

The

impedance

the

2.0

amp

tap

2.0

amperes

(

)

51.6

3.2

ohms

With

the

above

exceptions

the

included

instructions

GEH

1753

apply

these

types

every

respect

Inch

rates

Revision

Courtesy of NationalSwitchgear.com

GEI

31010

Short

Time

Overcurrent

Relays

Type

IAC

INDUCT

UNITS

NST

rUN

INST

SHORT

FIN

E R

Figure

(

0362

0506

)

Internal

Connection

Diagram

for

IAC

Relay

(

Front

View

)

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

SEAL

UNIT

STATIONARY

CONTACT

RIGHT

MAIN

STATIONARY

BRUSH

AND

CONTACT

ASSEMBLY

SEAL

MOVING

CONTACT

ASSEMBLY

—

ktNERAL

(

UlMjj

DISK

•

(

UNIT

DRAG

MAGNET

(

8006996

)

Front

View

CRADLE

DISK

AND

SHAFT

COIL

MAGNET

AND

TAP

SLOCK

ASSEMBLY

LOWER

JEWEL

SCREW

(

8006997

)

Rear

View

The

Induction

Unit

for

Type

IAC

lays

„

Figure

Courtesy of NationalSwitchgear.com

TIME

OVERCURRENT

RELAYS

TYPE

IAC

INTRODUCTION

Outline

Panel

Drilling

Contact

Circuits

Trip

Induction

Unit

Instantaneous

Unit

Internal

Connection

Type

Unit

One

Two

Fig

One

Fig

IAC

(

)

IAC

(

)

IAC

(

)

LAC

(

)

IAC

(

)

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

APPLICATION

INTRODUCTION

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

Overcurrent

Relays

Type

IAC

X X

CJJ

JJI

51789

1 0

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

BURDENS

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

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

0.6

2.0

0.2

2.0

0.6

2.0

0.2

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

5.0

Freq

0.45

Tap

1.2

0.37

2.3

2.6

0.2

2.0

0.6

2.0

4.0

8.8

0.35

0.29

0.15

0.05

0.5 0.5

(

amp

)

(

ohms

)

(

ohms

)

(

ohms

)

0.78

8.3

0.24

0.18

0.32

4.0

8.0

0.31

6.2

0.65

0.36

4.0

7.5

0.30

0.54

5.1

1.5

6.0

1.5

59.0

2.36

0.26

1.5

52.0

2.08

0.28

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

1.5

48.0

1.92

0.34

0.5

2.0

21.2

0.5

530.0

470.0

430.0

0.26

0.5

18.8

0.28

0.5

17.2

0.34

TAP

RANGE

2.0

TAP

RANGE

6.0

AMPS

TAP

RANGE

AMPS

MULTIPLES

MINIMUM

TAP

SETTING

SATURATION

CURVES

VARIOUS

FREQUENCIES

FOR

TAP

RANGES

THE

TYPE

IAC

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

eus

TRIP

BUS

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

Fig

(

6375667

)

External

Connections

Three

Type

IAC

Relays

used

for

Phase

and

Ground

Overcurrent

Portection

Phase

Circuit

Trip

Coil

Auxiliary

contact

closed

when

breaker

closes

BUS

JLL

TRIPPING

‘

UNIT

llrl

ACTOR

Fig

(

6375669

)

External

Connections

Three

Type

IAC

Relays

used

for

Phase

Circuit

Protection

Fig

(

6375668

)

External

Connections

Three

Type

IAC

Relays

used

Conjunction

with

Tripping

Reactors

for

Protection

aTThree

Phase

Circuit

Courtesy of NationalSwitchgear.com

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