Ge Chc12a User manual

INSTRUCTIONS

GEI-7,1676E

I:\SERT

BOOKLET

GEK-1253

FAULT

DETECTOR

RELAY

TYPES

CHC12A

CHC13A

CHC13B

GENERAL

_

ELECTRIC

GEI-74676 Fault

Detector

Relay Type

CHC

2

TARGET

UNIT

MOViNG

r:ONTACT

CONTROL

SPRING

ADJUSTER

MOVING

CONTACT

STOP

ASSEMBLY

Fig.

1

(80",033(\

&

8030329)

____

REAR

8"ll_

STOP

ASSeMBLY

_---

__

seAL

-!N

UNIT

-----

CUP

UNIT

(PFDl

CHC12A

Removea ?rom Case

C:".UT(.b-

AClJJSTil\;G

SCRtw

<:.)

FAULT DETECTOR RELAY

CHC12A,

CHC13A

AND

CHC138

INTRODUCTION

This

supplement

in

conjunction

with

GEK-1253

forms

instructions

for

the

CHC12A

relay.

All

in-

formation

pertinent

to

the

CHC12A

relay

but

not

covered

by

this

supplement

isasshowninGEK-1253.

The

CHC

l2A

relay

is

a

three-phase

high

speed

nondirectional

overcurrent

relay.

The

relay

con-

sists

of

an

induction

cup

unit

(PFD),

a

target

unit,

and

a

telephone-type

seal-in

unit

mounted

in

an

S-2

size

drawout

case.

The

CHC13A

is

similar

to

the

CHC12A

except

for

the

contact

circuit

arrangement.

The

CHC13A

(PFD)

operates

an

auxiliary

telephone

relay

which

provides

two

normally

open

electrically

separate

contacts.

A

target

is

wired

in

one

of

these

contact

circuits.

This

auxiliary

relay

occupies

the

same

position

as

the

seal-in

unit

in

the

CHCI2A.

The

auxiliary

relay

is

a D.C.

continuously

rated

unit

that

draws

less

than

5

watts.

The

CHC

l3B

is

similar

to

the

CHC13A

except

for

internal

connection.

The

main

operating

unit

of

this

relay

is

similar

in

construction

except

for

the

moving

element

stop

screw,

and

has

the

same

operating

characteristics,

as

the

PFD

unit

of

the

CHCllA

relay

described

in

the

attached

GEH-2035.

APPLICA

TION

The

CHC12

relay

is

designed

for

use

as

a

cur-

rent

fault

detector

in

connection

with

distance

relays,

to

prevent

operation

of

the

associated

timer,

or

tripping

of

the

circuit

breaker

due

to

loss

of

relay

potential

supply

for

other

reasons

than

a

system

fault.

This

can

occur

due

to

(1)

short

circuits

or

open

circuits

involving

the

potential

supply,

or

(2)

due

to

switching

(with

some

configurations

of

power

circuits),

or

(3)

due

to

the

use

of

line-side

potential

supply.

In

the

latter

case,

the

fault

detector

pro-

tects

the

timer

against

burnout,

and

prevents

false

re-tripping

of

the

circuit

breaker

at

the

instant

of

reclosure.

The

case

size

and

internal

connections

are

arranged

to

provide

mechanical

and

electrical

inter-

changeability

with

the

PJC31C

or

D.

The

advantage

of

the

CHC

over

the

PJC

is

that

it

is

designed

to

permit

operation

in

the

picked

up

position,

so

that

it

can

be

used

where

the

maximum

load

current

exceeds

the

mlnlmUm

fault

current.

During

load

conditions

which

pick

up

the

CHC,

it

cannot

perform

function

(1)

above,

and

it

mayor

may

not

perform

function

(2)

above

(depending on

whether

the

con-

nections

are

such

as

to

pick

up

the

CHC),

but

it

will

always

perform

function

(3).

The

relay

includes

a

separate

target

and

seal-in

unit

operated

from

trip

current.

The

target

and

seal-in

units

ratings

are

given

below:

,

I,

Rated

Operating

Trip

Duty

Resistance

I

Current

Range

AMPS OHMS

--

0.2

-3 3 12.4

1.0 1 -

30

0.64

,.-

2.0

2 -

30

0.22

---~-~-

--

Typical

external

connections

for

both

CHC12A

and

CHC13A

are

shown

in

Figs.

2

and

7 of

this

supplement.

CONSTRUCTION

Outline

and

Panel

Drilling

dimensions

for

the

Type

CHCI2A,

CHC13A

and

13B

relays

are

shown

in

Fig.

8 of

this

supplement.

The

internal

connections

for

these

relays

are

shown

in

Figs.

3,

4

and

5 of

this

supplement.

RECALmRA

TION

The

moving

contact

stop

screw

assembly

of

this

relay

is

on

the

left

rear

section

of

the

moulded

head

directly

behind

the

stationary

contact.

The

contact

gap

of

the

PFD

is

0.020

inch.

This

gap

is

set

at

the

factory

and

it

normally

will

not

be

necessary

to

reset

it.

However,

if

an

inspection

indicates

that

this

setting

has

been

disturbed

the

following

procedure

is

recommended.

a.

Remove

the

rear

ball

stop

assembly.

b.

Loosen

the

locking

screw

of

the

contact

stop

screw

assembly

and

advance

the

stop

screw

until

the

moving

contact

arm

is

parallel

to

the

sides

of

the

cup

unit.

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.

Should

further

information

be

desired

or

should

particular

probleTf15

arise

which

are

not

covered

sufficiently

for

the

purchaser's

purposes,

the

matter

should

be

referred

to

the

General

Electric

Company.

Tu

the

extent

r"<1uirAd

the

prod'.1cts

described

herein

meet

applicabh'

"1NSr,

IEEE

and

NEMA

standards;

but

no

s,]ch

,iSSUrancc)

js

given

h'ith

respect

to

local

codes

and

ordindnce~-;

b::.ca!l~;c

i'hey

vaz'y

greatly.

I

3

GEI-74676

Fault

Detector

Relay

Type CHC

c.

Advance the

stationary

contact

assembly

until

it

just

touches

the moving

contact.

A

neon

lamp

connected

across

terminals

1

and

12

is

best

suited

for

this

purpose.

d.

Tighten

the

clamping

screw

so

that

the

stationary

contact

is

secure.

e.

Back

off

the

stop

screw

until

the

measured

gap

is

0.020 inch between the

stationary

and moving

contacts.

(It

should

be noted

that

0.020 inch

corresponds

to

approximately

two-thirds

of a

turn

on the

stop

screw).

f.

Tighten

the locking

screw

of the moving

contact

assembly

stop

screw

in

this

posi-

tion.

Care

should be

taken

so

as

not to

disturb

the

contact

adjustment

and

it

should

be

noted

that

the locking

screw

bears

on

the

moving

contact

stop

assembly

support.

With

the

connections

of

Fig.

6 of

this

supple-

ment,

set

the

current

of the cup

unit

at

the

mini-

mum pickup

value

and

adjust

the

control

spring

as

described

under

SETTINGS, in the

attached

,.

GEK-12

53

to

obtain

pickup.

Replace

the

rear

ball

stop

assembly

and

advance

it

slightly,

making

sure

that

the moving

contact

arm

does

not

touch

the

rear

ball

stop

assembly

when

it

is

pushed

by hand to

close

and wipe

in

on the

stationary

contact.

Now,

change

the

current

to

1.5

times

the

minimumjlickup

current.

By

means

of

switch

S

(Fig.

6), apply

current

suddenly

and

observe

whether

the

cup

unit

contacts

bounce

open. A neon

light

connected

across

terminals

1

and

12

is

best

suited

for

this

purpose.

If

there

is

no

visible

contact

bounce,

tighten

the

clamping

screw

to

hold

the

ball

stop

assembly

in

position.

If

the

..

~C'.,tacts

bounce,

advance

the

rear

ball

stop

PHASE

SE()Ut.NCt.

1-2-3

OR

3-2-1

--~-------1

--+--1~-----2

---+--1--

........

----3

assembly

carefully

until

there

is

no

contact

bounce

when

current

is

suddenly

applied.

Be

sure

not to

advance

the

assembly

excessively,

as

it

will

change

the

cup

unit

pickup. (The moving

contact

arm

should

touch the

rear

ball

stop

assembly

after

the

front

contact

closes

and

wipes

in

at

least

0.005 inch),

To

make

sure

the

rear

ball

stop

assembly

is

not

advanced

excessively,

reduce

the

current

through

the

relay

to

the

minimum

pick

up

value.

The

relay

should

operate

to

close

its

contacts

at

that

value.

The pickup of the cup

unit

may be changed in

the

manner

described

under

SETTINGS of

PFD

in

attached

GEK-1253.

With the

connections

of

Fig.

6, the

clutch

should

be

adjusted

to

slip

at

approximately

20

amperes.

The

clutch

sUpping

point

may

be changed

by

turning

the

clutch

adjusting

screw.

Turning

the

3~rew

clockwise

will

cause

the

clutch

to

slip

at

a

hlgh~r

value

of

current.

Be

sure

to

tighten

the

lockmg

nut, but be

careful

not to

disturb

the

clutch.

SEAL-IN UNIT

AND

TARGET UNIT

1.

Mechanical

Adjustments

Seal-In

Unit

a.

There

should

be

at

least

1/32

inch

clearance

between

the

armature

and

the

pole

piece.

b. The

normally

open

contacts

should

have a

gap of 0.015 inch

and

the

normally

closed

contacts

should

have

at

least

15

grams

pressure

as

measured

at

the

contact

tip.

The

normally

open

contacts

should

close

with

at

least

0.005

inch

wipe.

The

normally

closed

contacts

should open to a gap of

0.015 inch.

!lQ

2Q

13rPi6

191

SI

1 I

I.

I

TO

I 1

ONE

OR

I I

THREE

DISTANCIi:

I

I,

RELAY~

OOTTED

CONN'S.

ARE

REQUIRED

FOR

PJC31

,

OPTIONAL

FOR

CHC12.

50-FAULT

DETECTOR

TYPE

CHe

52-CIRCUIT

BREAKER

SI-SEAL-IN

UNIT

Fig.

2 (C)l(:5A6887-(J;

r:rpical

External

Connections

For

The

CHC~2A

Relay

4

8

0.

0··

~/

-'--

TARGET

PFD

(r1

1fl

~

[-1

I

2 4 6 8

10

*=

SHORT

FINGER

;;'1,;.

3

(0148A3956-6)

Internal

Connections

(Front

View)

For

The CHC12A

Relay

Fault Detector Relay

Type

eHe

GEI-74"JI';

11

;:)

I "114

AI

, f

j

b

2 4

R

(WHI:N

U~ED)

10

R3

47K

Fig.

4

(0165A7519-6])

Ircte2';1:11

Conncctio:1S

Ii,

Ty-pe

CHC13A Rela.\'

(Front

Vi,"",)

5

GEI-74676 Fault Detector Relay Type

CHC

6

12

~

J~

IA

I

Lc

T

C1

W

PFO

I

L

I-

1 1I

1 3

2 4

1~

Ii

Q

CJ

C3

R3

41-:...fL I

"

SE~~)

I

!tI.

\II

I

6

19

If

~r

A

C2

W

PFD

o

]

9

1"

'"

SHORT

FINGERS

Fig.

5

(0178A7139-5)

Internal

Connections

For

TypE' CHC13B

Relay

(Front

View)

,

I·

:2C

V0LTS

_________________________________

~~

_____________

~5~

6

I

P,I')

, .

iJ

i;~;

1r

Fault

Df:,e['!or

Relay

Type' CHC

(,E£74f)?r;

PHASE

S[QUENCE

1-2-3

OR

3-2-1

1

------.--

.

__________

<'_

1

CIRCUIT

BREAKER

3

50

3 4

50

5 6

50

---=/'rs-

2

3

(+>

10I~

PFD

9

50

A

5..Q.

HC

I

50

I

1

11

50

13

T

50

21

~

12fA

1)

A

TO

PROTECTIVE

RELAYS

--'--------_._---

(

-)

NOTE:

A

SHORT

I

NG

BAR

EX

I

STS

BETWEEN

STUDS

11

&

12

SO

THAT

WHEN

RELAYS

REMOVED

FROM

CASE

POSITIVE

POTENTIAL

IS

BROUGHT

DIRECTLY

TO

THE

PROTECTIVE

RELAYS.

IF

THIS

IS

NOT

DESIRED,

MAKE

NO

CONNECTION

TO

STUD

.11.

.LfGEND

~O

-

CHC13A

PFD -

PHASE

FAULT

DETECTER

A-

AUXILIARY

UNIT

T -

TARGET

H.C.-HOLDING

COIL

(~jE~

USE~J

F'ig.

7'

(0178A7089-1)

8xtl""D.l

C,)IUlt'ctions

F,",

'l'lw

CaCl

'A

}~'.'.l;~:,

'7

GEI-74676

Fault

Detector

Relay

Type

CRC

PANEL

LOCATION

6.625

-

168MM

SEMI-FLUSH

SURFACE

~MTG,

MTG~I

Or

,,0

1-

1

0.312

(2)

5/16-18

STUDS

FOR

SURFACE

MTG.

1917151311

00000

9 .875

20

18 16

14

12

250MM

261MM

(4)

1

0-32

X

3/8

MTG,

SCREWS

STUD

NUMBERING

GLASS

10'

1/4

DRILL

4

HOLES

6MM~

~

2.781

71MM

5.562-

r

~

42MM

T

i

__

_

T

~-

!

I

J..

't'

I

,

.218

~

5MM

I

·t~

1 . 125 - _ I

29MM

I

i

,

tL

I

-ct-

-1---

CUTbuT

I

,

5.687

144MM

PANEL

DRILLING

10-32

_.

STUDS

9

753

1

00000

10

8 6 4 2

I ! I I

~

75

~

6,

187 1

'3MM

3 , 0 I

157MM

76MM

~

BACK

VIE'W

CUTOUTS

MAY

REPLACE

DRILLED

HOLES

-

I

~

5.000

127MM

L_

10.

00

o

M

254M

I

t

1

,75

[46MM

4,875

123MM

i

1

9.75

__

~_

............

___

~

2471MM

1,468

l'

37MM

~----~~--~~I~

I I

3/4

DRILL

20

HOLES

19MM

____

.500

12MM

(TYPICAL)

PANEL_

DR

I

LL_

I

NG

FOR

SEMI-FLUSH

MOUNTING

~5/16-18

FOR

SURFACE

HC!UNT

ING

FRONT

VI

['vi

FRONT

VIEW

TYPICAL

DIM.

INCHES

MM

CA

3.0

I

76MM

STUD

VIEW

SHOWING

ASSEMBLY

OF

HARDWARE

FOR

SURFACE

MTG.

ON

STEEL

PANELS

* Fig. 8 (6209272 [7J) Outline

and

Panel

Drilling

Diagram

for

the

CHC12A,

CHC13A

and

CHC138

Relays

{2/92}

(1200)

GENERAL

ELECTRIC

METER

AND

CONTROL

BUSINESS

DEPT.,

MALVERN,

PA

19355

GE CHC12A User manual

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