GE IAC53A Manuale utente

INSTRUCTIONS

GEH

-

1788

L

TIME

OVERCURRENT

RELAYS

TYPES

IAC

53

A

IAC

53

B

IAC

53

C

IAC

53

R

IAC

54

A

IAC

54

B

GENERAL

^

ELECTRIC

Courtesy of store.ips.us

GEH

-

1788

Tvne

IAC

Time

Overcurrent

Relay

TOP

PIVOT

TAP

PLUG

SEAL

-

IN

UNIT

HOLDING

COIL

SEAL

-

IN

TARGET

SEAL

-

IN

—

-

UNIT

STATIONARY

CONTACT

,

LEFT

SEAL

-

IN

UNIT

STATIONARY

CONTACT

,

RIGHT

TAP

BLOCK

—

TIME

DIAL

DISK

SHAFT

MAIN

MOVING

CONTACT

MAIN

STATIONARY

BRUSH

AND

CONTACT

ASSEMBLY

1

r

MAGNET

DISK

SEAL

-

IN

MOVING

CONTACT

ASSEMBLY

Lf

>

£

3

04

O

00

Ol

Li

_

Fig

.

I

The

Induction

Unit

for

Type

IAC

Relays

(

Front

View

)

00

04

in

04

-

CRADLE

o

oo

04

cn

u

_

DISK

AND

SHAFT

COIL

AND

TAP

BLOCK

ASSEMBLY

ID

ao

04

LT

)

CO

o

oo

k

.

<

D

>

O

LOWER

JEWEL

SCREW

.

/

o

Fig

.

2

The

Induction

Unit

for

Type

IAC

Relays

(

Rear

View

)

2

Courtesy of store.ips.us

TIME

OVERCURRENT

RELAYS

TYPE

IAC

INTRODUCTION

Contact

Circuits

Instan

.

A

-

C

Trip

Indue

.

Outline

&

P

.

D

.

Int

.

Conn

.

Type

Unit

IAC

53

A

(

“

)

A

IAC

53

B

(

-

)

A

LAC

53

C

(

-

)

A

iAC

53

R

(

-

)

A

IAC

54

A

(

-

)

A

IAC

54

B

(

-

)

A

One

Two

No

Fig

.

12

Fig

.

13

Fig

.

14

Fig

.

15

Fig

.

16

Fig

.

17

No

One

On

3

One

Fig

.

20

Fig

.

20

Fie

.

20

Fig

.

20

Fig

.

20

Fig

.

20

Yes

No

Yes

No

Yes

No

The

Types

IAC

53

and

IAC

54

relays

are

time

overcurrent

relays

with

a

very

-

inverse

time

char

-

acteristic

.

overcurrent

on

single

-

phaseandpoly

-

phasecircuits

.

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

.

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

.

They

are

employed

to

protect

against

These

relays

consist

of

an

induction

unit

or

an

induction

unit

with

an

instantaneous

unit

which

per

-

INDUCTION

UNIT

APPLICATION

INTRODUCTION

The

induction

unit

is

the

main

unit

in

all

Type

IAC

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

.

The

induction

unit

is

the

basic

unit

in

all

Type

IAC

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

.

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

.

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

.

RATINGS

The

induction

unit

is

designed

to

use

any

one

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

every

possible

contingency

to

be

met

in

connection

with

installation

,

operation

or

maintenance

,

further

information

be

desired

Should

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

given

with

respect

to

local

codes

and

ordinances

because

they

vary

greatly

.

3

Courtesy of store.ips.us

GEH

-

1788

Type

IAC

Time

Overcurrent

Relay

ii

i

mil

I

SI

!

!!

*

I

i

•

*

»

*

8

^

S

.

«

.

7

.

»

.

0

1

I

4

B

I

7

I

lit

St

44

II

M

78

N

MS

1044

16

M

Mi

•

00

M

4

MO

704

Mfl

EXTENDED

P

/

NGE

(

8

C

0

EERlEC

)

tit

•

04

ADJUSTMENTS

441

4

M

RATINGS

INST

.

UNIT

TIME

UNIT

TAPS

I

N

ST

UNIT

TIME

UNIT

tft

Mi

CONTINUOUSLY

ADJUSTABLE

G

•

5

,

0

6

,

0

-

7

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0

8

,

1

-

0

;

1

*

2

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,

2

0

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,

2

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5

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3

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0

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5

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2

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-

03

4

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5.0

|

6

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Oj

7

-

Oj

8.0

^

10

,

12

2

-

0

,

2

-

5

,

3

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O

3

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0.5

-

4

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0

2

-

16

10

-

80

20

-

160

Q

.

5

-

4.0

I

.

5

-

12.0

stt

100

2

-

16

104

m

*

mm

100

•

4

M

W

M

74

70

M

90

M

20

10

IB

A

1

7

\

VUu

\

MV

A

•

d

I

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v

.

s

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8

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\

I

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\

s

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v

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N

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'

SN

s

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x

\

s

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s

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W

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v

t

1

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V

9

.

0

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.

0

8

\

V

,

N

7

s

in

-

.

4

\

6

9

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B

C

s

x

5

v

.

4

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N

V

®

s

CO

.

s

3

s

\

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o

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\

2

o

.

2

\

S

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®

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x

-

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.

H

.

1

.

1

.

04

.

0

«

k

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07

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M

jn

n

JS

JI

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iMillf

J

*

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.

4

.

7

.

0

J

1

a

4

1

min

St

44

70

BOM

|

I

III

I

Kill

MULTIPLES

OF

RELAY

TAP

SETTING

M

Figure

3

(

0888

B

0270

[

3

]

)

Time

-

Current

Curves

for

Type

IAC

Relays

with

Very

-

Inverse

-

Time

Characteristics

4

Courtesy of store.ips.us

Type

LA

.

C

Time

Overcurrent

Relay

GEH

-

1788

CM

LO

CALIBRATION

PLATE

ADJUSTABLE

POLE

PIECE

CM

I

3

a

ao

CONTACTS

INSTANTANEOUS

W

UNIT

OPERATING

COIL

-

TARGET

STATIONARY

CONTACTS

MOVING

CONTACT

ASSEMBLY

SHORTING

.

COIL

u

.

MAIN

COIL

A

-

C

TRIPPING

”

UNIT

to

CM

to

CM

o

oo

to

Ol

li

.

Type

I

AC

Relay

with

an

Instantaneous

Unit

(

Front

View

)

Fi

g

.

Fig

.

4

BURDENS

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

:

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

.

Amperes

,

a

-

c

or

d

-

c

Volt

Imp

.

Ohms

Coil

PF

Function

Amps

Freq

.

Tap

Amps

2

-

Amp

Tap

0.2

Amp

Tap

5

Tripping

Duty

Carry

Continuously

Operating

Range

Resistance

Impedance

at

60

cy

30

0.08

0.50

5

60

4

2.0

4

-

16

0.3

3

0.07

5

0.50

50

1.7

4

0.2

-

2

-

30

0.05

0.61

5

1.3

25

4

7

0.13

0.58

0.42

1.5

-

6

60

1.5

5

14.5

52

0.53

0.48

0.42

50

1.5

5

12.0

0.36

0.55

25

1.5

5

9.0

4.20

0.5

*

2

0.35

0.5

60

5

105.0

3.45

0.34

0.5

50

5

86.0

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

.

3.28

0.55

0.5

5

25

82.0

*

0.38

122

3050

2546

5

0.1

60

0.1

-

0.4

0.36

102

5

0.1

50

INSTANTANEOUS

UNIT

INTRODUCTION

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

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

.

5

Courtesy of store.ips.us

GEH

-

1788

Type

IAC

Time

Overcurrent

Relay

26

24

22

TAP

RANGE

0.5

-

2.0

AMPS

.

20

16

DQ

'

V

16

25

/

-

U

V

14

0

L

T

12

CM

o

TAP

60

AJ

o

O

RANGE

1.5

-

6.0

AMPS

.

-

5

0

'

v

*

<

o

25

^

TAP

cr

>

60

^

NJ

'

.

RANGE

4

-

16

AMPS

.

ii

.

50

oj

2

5

MULTIPLES

OF

MINIMUM

PlCK

-

UP

CURRENT

SATURATION

CURVES

FOR

LOWEST

TAPS

OF

INDUCTION

UNITS

ON

VERY

INVERSE

TYPE

IAC

RELAYS

Saturation

Curves

for

Lowest

Taps

of

tne

Induction

Unit

of

Type

IAC

Relays

with

Very

-

Inverse

-

Time

Characteristics

6

Courtesy of store.ips.us

Type

1

AC

Time

Overcurrent

Relay

(

JEH

-

1788

0.030

1

T

OPERATING

TIME

RANGE

FOR

ANY

PICKUP

SETTING

T

0.025

o

Ul

0.020

1

UJ

*

-

0.015

a

.

e

0.010

a

.

0.005

0

2

3

4

5

6

7

8

9

10

MULTIPLES

OF

PICK

-

UP

Fig

.

7

A

(

K

-

6306872

[

3

]

)

Time

-

Current

Characteristics

for

Original

Instantaneous

Unit

111

SEISMIC

RATED

INSTANTANEOUS

UNIT

OPERATING

TIME

T

1

t

.

025

T

1

,

1

—

1

t

•

.

020

1

a

L

v

-

i

8

1

.

©

l

&

\

2

1

OPERATING

TIME

RANGE

FOR

ANY

PICKUP

SETTING

a

.

§

.

010

a

.

\

.

005

9

10

4

3

1.5

2

MULTIPLES

OF

PICKUP

Fig

.

7

B

(

0208

A

869

5

-

1

)

Time

-

Current

Characteristics

for

the

,

?

Hi

-

G

”

Unit

7

Courtesy of store.ips.us

GEH

-

1788

Type

IAC

Time

Overcurrent

Relay

APPLICATION

RATINGS

The

instantaneous

unit

is

used

on

certain

Type

IAC

relay

models

to

provide

instantaneous

tripping

for

current

exceeding

a

predetermined

value

.

The

instantaneous

unit

is

designed

to

use

the

coils

listed

below

;

Coil

Amp

Volt

-

Amp

Freq

Imp

.

Ohms

P

.

F

.

5

0.5

-

2

60

360

14.4

0.74

OPERATING

CHARACTERISTICS

5

3.6

1

-

4

60

0.77

90

5

2

-

8

60

22.5

0.83

0.90

5

25

0.32

0.83

8.0

5

5.63

4

-

16

60

0.225

0.191

0.157

0.095

0.87

*

The

instantaneous

unit

operates

over

a

four

-

calibration

stamped

on

5

4.77

0.87

50

and

has

its

to

-

one

range

a

scale

mounted

beside

the

adjustable

pole

piece

.

Time

-

current

5

40

3.93

0.88

5

2.37

25

0.88

characteristics

are

shown

in

Fig

.

7

A

for

the

instantaneous

unit

used

before

1977

.

5

7

-

28

60

1.68

0.067

0.88

In

1977

make

it

have

a

higher

seismic

rating

,

instantaneous

unit

can

be

identified

by

the

mark

-

ing

"

Hi

-

G

"

moulded

into

the

front

moulding

just

above

the

target

windows

,

characteristic

for

the

"

Hi

-

G

"

Fig

.

7

B

.

the

instantaneous

unit

was

modified

to

The

new

5

60

0.83

0.033

0.032

0.027

10

-

40

0.95

5

0.80

50

0.95

5

25

0.68

0.98

time

-

current

The

unit

is

shown

in

5

20

-

80

60

0.20

0.008

0.007

0.95

5

0.20

50

0.95

LJ

.

25

0.18

0.98

A

-

C

TRIPPING

UNIT

circulates

through

the

induction

unit

cur

rent

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

of

the

flux

gener

-

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

.

INTRODUCTION

The

a

-

c

tripping

unit

is

a

Type

REA

relay

unit

designed

to

energize

a

circuit

-

breaker

trip

coil

from

its

associated

current

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

Courtesy of store.ips.us

Type

IAC

Time

Overcurrent

Relay

GEH

-

1788

A

—

C

BuS

.

TRIP

B L

$

1

2

n

51

N

Device

Function

Numbers

for

Use

with

ALL

External

Diagrams

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

breaker

closes

3

SI

51

-

51

-

1

Ji

rr

SIN

T

i

50

J

l

J

51

2

52

51

N

Ilk

r

TC

52

SI

TC

A

l

5

j

51

-

3

51

-

1

0

'

"

.

*

1

H l

"

5

,

_

JLT

Figure

8

(

K

-

6375667

[

2

]

)

External

Connections

of

Three

Type

IAC

53

A

Relays

Used

for

Phase

-

to

-

Phase

and

Ground

Overcurrent

Protection

of

a

3

-

Phase

Circuit

A

-

C

BIS

1

2

A

-

C

BUS

1

3

2

3

52

.

52

1

TOC

8

A

-

C

TRIPPING

5

Toe

51

=

3

UNIT

11

=

1

Hll

*

1

IOC

X

1

H

1

6

hi

F

liriL

TRIPPING

|

RT

ACT

0

R

“

*

,

1

51

-

2

51

-

1

It

i

i f

i

t

10

9

2

^

f

2

-

y

M

6

Figure

9

.

(

K

6375668

-

1

)

External

Connections

of

Three

Type

IAC

53

A

Relays

used

in

Conjunction

with

Tripping

Reactors

for

Protection

of

a

3

-

Phase

Circuit

Figure

10

.

(

K

-

6375669

-

6

)

External

Connections

of

Three

Type

IAC

53

R

Relays

Used

For

3

-

Phase

Circuit

Protection

9

Courtesy of store.ips.us

GEH

-

1788

Type

IAC

Time

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

.

T

«

5

S

I

BREAKER

TRIP

COIL

RATINGS

The

a

-

c

tripping

unit

has

a

continuous

rating

of

five

amperes

but

will

operate

on

a

minimum

current

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

REA

11

B

relay

,

which

has

contacts

rated

200

am

-

peres

,

can

be

used

in

conjunction

with

Type

IAC

overcurrent

relays

,

mounted

inside

the

Type

IAC

case

.

AC

TRIP

UNIT

NORMALLY

CLOSED

CONTACT

S

CURRENT

TRANS

IOC

:

T

0

C

LQC

AC

TRIP

UNIT

SHORTING

COIL

~

T

The

Type

REA

1

IB

is

not

CVJ

VO

BURDENS

vo

ID

Burdens

of

the

Type

REA

unit

are

given

in

the

following

table

:

vO

o

AC

TRIP

UNI

I

MAIN

COIL

Volt

-

Amperes

Impedance

in

Ohms

PF

IQ

£

CD

Frequency

Amps

60

0.80

12.2

5

0.49

50

5

0.33

0.80

8.3

Diagram

Illustrating

Operation

of

Type

IAC

Relays

having

an

A

-

C

Tripping

Unit

*

Fi

g

.

II

0.62

25

5

0.23

5.8

RECEIVING

,

HANDLING

AND

STORAGE

ing

the

relay

in

order

that

none

of

the

parts

are

injured

or

the

adjustments

disturbed

.

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

.

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

.

Reasonable

care

should

be

exercised

in

unpack

-

INSTALLATION

relay

types

are

shown

in

Figs

.

12

to

17

inclusive

.

Typical

wiring

diagrams

are

given

in

Figs

.

8

to

10

inclusive

.

LOCATION

The

location

should

be

clean

and

dry

,

free

from

dust

and

excessive

vibration

,

and

well

lighted

to

facilitate

inspection

and

testing

.

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

.

MOUNTING

INSPECTION

'

n

The

relay

should

be

mounted

on

a

vertical

The

outline

and

panel

diagram

is

shown

surface

.

At

the

time

of

installation

,

the

relay

should

be

inspected

for

tarnished

contacts

,

loose

screws

,

or

other

imperfections

.

If

any

trouble

is

found

,

it

should

be

corrected

in

the

manner

described

under

MAINTENANCE

.

in

Fig

.

20

.

CONNECTIONS

The

internal

connection

diagrams

for

the

various

10

*

Indicates

Revision

Courtesy of store.ips.us

GE IAC53A Manuale utente

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