Ge Magne-blast am-13.8-1000-3h User manual

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GEI

-

88766

INSTRUCTIONS

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CONTENTS

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Handling

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Installation

,

.

..

Description

of

Operation

.

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4

3

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550000

ft

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0

*

Adjustments

O

o

ft

m

12

General

Maintenance

31

Renewal

Parts

-

SWITCHGEAR

lEPliTiill

GENERAL

!

'

•

I

-

.

'

-

•

a

Courtesy of NationalSwitchgear.com

OKI

-

88766

*

<

v

«

MAGNE

-

BLAST

CIRCUIT

BREAKER

AM

-

13.8

-

1000

-

3

(

A

)

A

Letter

Designation

B

and

H

,

used

immediately

following

the

model

number

indicates

basic

design

features

.

INTRODUCTION

The

magne

-

blast

circuit

breaker

is

the

removable

interrupting

element

for

|

use

in

vertical

-

lift

metal

-

clad

switchgear

,

to

provide

reliable

control

‘

"

and

protection

of

power

systems

.

Among

the

many

advantages

of

metal

-

clad

switchgear

are

added

protection

to

equipment

and

personnel

,

compactness

,

simplified

installation

and

reduced

maintenance

.

In

keeping

with

these

features

the

magne

-

blast

breakers

are

designed

for

interchangeability

and

maneuverability

,

together

with

reliability

and

low

maintenance

require

-

ments

.

The

magne

-

blast

circuit

breaker

operates

on

the

principle

that

an

arc

can

be

interrupted

in

air

by

sufficiently

elongating

and

cooling

it

.

This

is

accomplished

by

means

of

a

strong

magnetic

field

that

lengthens

the

arc

and

forces

it

into

intimate

contact

with

cool

dielectric

material

.

A

sturdy

,

reliable

operating

mechanism

assures

low

maintenance

and

long

life

.

The

AM

-

13.8

magne

-

blast

breaker

is

available

in

a

number

of

current

ratings

.

Refer

to

the

breaker

nameplate

for

the

complete

rating

information

of

any

particular

breaker

.

The

short

circuit

conditions

to

be

imposed

on

the

breaker

must

not

exceed

its

rating

,

nor

should

it

be

called

upon

to

operate

at

voltages

or

currents

greater

than

those

given

on

the

nameplate

.

Since

this

book

is

written

to

cover

several

ratings

of

breakers

that

are

of

the

same

general

design

,

all

instructions

will

be

of

a

general

character

and

all

illustrations

will

be

typical

,

unless

otherwise

specified

.

Sv

,

PROPER

INSTALLATION

AND

MAINTENANCE

ARE

NECESSARY

TO

INSURE

CONTINUED

SATISFACTORY

OPERATION

OF

THE

BREAKER

,

The

following

instructions

will

provide

complete

information

for

placing

magne

-

blast

breakers

in

service

and

for

maintaining

satisfactory

operation

.

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

,

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

.

Should

further

1

Courtesy of NationalSwitchgear.com

GE

1

-

88766

RECEIVING

.

HANDLING

,

AMD

STORAGE

©

Receiving

and

Handling

Each

breaker

is

carefully

inspected

,

and

packed

by

workmen

experienced

in

the

proper

handling

and

packing

of

electrical

equipment

.

Immediately

upon

receipt

of

the

circuit

breaker

*

an

examination

should

be

made

for

any

damage

sustained

in

transit

.

If

4

-

njury

or

rough

handling

is

evident

*

a

damage

claim

should

be

filed

Immediately

with

the

transportation

com

-

pany

and

the

nearest

General

Electric

Sales

Office

should

be

notified

.

It

is

expected

that

due

care

will

be

exercised

during

the

unpacking

and

installation

of

the

breaker

so

that

no

damage

will

occur

from

careless

or

rough

handling

*

or

from

exposure

to

moisture

or

dirt

.

Loose

parts

associated

with

the

breaker

are

always

included

in

the

same

crate

.

Check

all

parts

against

the

packing

list

to

be

sure

that

no

parts

have

been

overlooked

.

m

The

arc

chutes

for

this

breaker

are

packaged

separately

,

removing

the

arc

chutes

from

their

containers

*

inspect

them

completely

for

damage

before

installation

on

the

breaker

.

After

carefully

Storage

It

is

recommended

that

the

breaker

be

put

into

service

immediately

in

its

permanent

location

.

If

this

is

not

possible

*

the

following

precau

-

tions

must

be

taken

to

insure

the

proper

storage

of

the

breakers

1

.

The

breaker

should

be

carefully

protected

against

condensation

*

pre

-

ferably

by

storing

it

in

a

warm

dry

room

*

since

water

absorption

has

an

adverse

effect

on

the

insulation

parts

.

Circuit

breakers

for

out

-

door

raetal

-

clad

switchgear

should

be

stored

In

the

equipment

only

when

power

is

available

and

the

heaters

are

in

operation

to

prevent

conden

-

sation

.

2

.

The

breaker

should

be

stored

in

a

clean

location

*

free

from

corrosive

gases

or

fumes

;

particular

care

should

be

taken

to

protect

the

equip

-

ment

from

,

moisture

and

cement

dust

*

as

this

combination

has

a

very

corrosive

effect

on

many

parts

,

3

.

Machined

parts

of

the

operating

mechanism

*

etc

with

a

heavy

oil

or

grease

to

prevent

rusting

.

If

the

breaker

is

stored

for

any

length

of

time

*

it

should

foe

inspected

periodically

to

see

that

rusting

has

not

started

and

to

insure

good

mechanical

condition

.

Should

the

breaker

be

stored

under

unfavorable

atmospheric

conditions

*

steps

should

be

taken

to

dry

out

the

breaker

before

it

is

placed

In

service

.

should

be

coated

9

$

M

:

.

k

m

#

2

Courtesy of NationalSwitchgear.com

GEI

~

88766

INSTALLATION

X

.

Remove

the

rear

barrier

,

side

barriers

,

interphase

barriers

,

and

the

front

cover

and

make

a

visual

inspection

to

ascertain

that

the

breaker

and

mechanism

,

is

in

satisfactory

condition

.

Check

all

bearing

sur

-

faces

of

the

mechanism

for

lubrication

.

Refer

to

section

on

LUBRICA

-

TION

(

page

15

)

.

2

.

The

arc

chutes

can

be

assembled

on

the

breaker

at

this

time

.

The

arc

chutes

should

be

lifted

only

by

the

use

of

hooks

in

the

lifting

holes

provided

in

the

top

of

the

arc

chute

brace

.

Refer

to

ARC

CHUTE

RE

-

MOVAL

(

page

14

}

.

Before

checking

the

breaker

for

electrical

opera

-

tion

be

certain

the

upper

mounting

bolts

(

used

as

an

electrical

and

mechanical

connection

)

and

the

lower

electrical

connection

to

the

arc

chute

is

tight

.

3

.

Charge

the

breaker

closing

springs

manually

using

a

5

/

8

,

!

ratchet

wrench

to

turn

the

driving

eccentric

(

6

)

Fig

.

4

,

Turning

the

eccen

-

tric

counter

clockwise

will

advance

the

ratchet

wheel

and

compress

the

springs

.

the

spring

(

10

)

Fig

.

4

When

tor

raised

from

the

ratchet

wheel

teeth

.

Additional

turning

of

the

eccen

-

tric

will

not

advance

the

ratchet

wheel

.

s

have

reached

the

fully

charged

position

the

indica

-

will

read

"

CHARGED

1

'

,

and

the

driving

pawl

will

be

Insert

the

spring

blocking

device

(

4

)

Fig

.

4

and

manually

discharge

the

springs

against

the

pins

by

pushing

the

manual

release

button

(

l

)

Fig

.

4

.

The

springs

are

now

blocked

and

slow

closing

of

the

breaker

contacts

can

be

accomplished

by

again

turning

the

driving

eccentric

with

a

5

/

8

"

ratchet

wrench

.

During

the

slow

closing

operation

check

to

insure

that

the

mechanism

does

not

stick

or

bind

during

the

entire

stroke

,

that

it

larches

se

-

curely

in

the

closed

position

,

and

that

it

trips

freely

when

the

man

-

ual

trip

lever

is

operated

.

The

breaker

should

not

be

operated

elec

-

trically

until

it

has

been

operated

several

times

manually

to

insure

freedom

of

action

.

At

this

time

,

also

check

the

following

adjustments

2

a

.

Primary

contact

wipe

b

.

Arcing

contact

wipe

c

.

Primary

contact

gap

Refer

to

page

7

Refer

to

page

J

Refer

to

page

J

"

DO

NOT

WORK

ON

EITHER

THE

BREAKER

OR

MECHANISM

UNLESS

THE

CLOSING

SPRINGS

ARE

BLOCKED

AND

THE

OPENING

SPRINGS

HAVE

BEEN

TRIPPED

OPEN

OR

MECHANICALLY

BLOC

ICED

.

THIS

PRECAUTION

IS

REQUIRED

TO

PREVENT

ACCIDENTAL

CLOSING

OR

TRIPPING

/

'

After

the

adjustments

have

been

checked

,

the

springs

cart

be

unblocked

.

Rotate

the

driving

eccentric

until

the

indicator

reads

’

'

CHARGED

9

'

and

the

ratchet

wheel

no

longer

is

advanced

.

The

blocking

device

can

now

be

removed

.

3

Courtesy of NationalSwitchgear.com

GEI

~

88766

4

,

Attach

test

coupler

to

circuit

breaker

and

operate

electrically

sev

-

eral

times

,

POWER

CHECK

51

.

I

Check

the

control

voltage

as

described

under

^

CONTROL

If

the

breaker

secondary

wiring

is

to

be

given

a

.

h

±

~

potential

NOTE

s

test

at

1500

volts

,

remove

both

the

motor

leads

from

the

terminal

connection

,

cause

damage

to

the

winding

insulation

.

Failure

to

disconnect

the

motor

from

the

circuit

may

5

.

Remove

the

test

coupler

and

replace

the

rear

,

side

,

and

inferpha

.

se

barriers

.

6

.

If

the

breaker

has

been

stored

for

a

long

period

of

time

,

it

is

recom

-

mended

that

the

insulation

be

checked

with

a

standard

60

cycle

high

potential

test

.

Refer

to

INSULATION

TEST

(

page

15

)

.

7

.

Lubricate

the

silver

portion

of

the

primary

disconnect

studs

by

rub

-

bing

a

small

amount

of

contact

lubricant

D

50

H

47

to

form

a

thin

coat

-

ing

on

the

ball

contact

.

8

.

Refer

to

metal

-

clad

instruction

book

GEH

-

1802

for

final

instructions

before

inserting

the

breaker

into

the

metal

-

clad

unit

.

DESCRIPTION

OF

OPERATION

The

magne

-

blast

breaker

is

composed

of

two

major

parts

,

the

breaker

ele

-

ment

and

the

operating

mechanism

.

The

breaker

element

comprises

three

similar

pole

units

,

each

pole

unit

consisting

of

main

and

arcing

'

con

-

tacts

,

an

interrupter

,

and

an

enclosing

box

barrier

that

segregates

the

interrupting

units

from

each

other

to

provide

insulation

between

phases

as

well

as

from

each

phase

to

ground

.

The

primary

connections

to

the

associated

metal

-

clad

equipment

are

made

through

the

primary

disconnect

studs

.

n

The

ML

-

13

operating

mechanism

shown

in

Figures

1

,

2

,

and

3

is

of

the

stored

energy

type

designed

to

give

high

speed

closing

and

opening

.

The

mechanism

will

operate

oh

a

-

c

or

d

-

c

voltage

as

indicated

on

the

breaker

nameplate

.

Closing

and

opening

operations

are

controlled

electrically

by

the

metal

-

clad

or

remote

relaying

,

and

mechanically

by

the

manual

close

and

trip

levers

on

the

breaker

.

All

secondary

connections

from

the

breaker

to

the

metal

-

clad

unit

are

made

through

the

coupler

(

1

)

Fig

.

1

.

A

positive

interlock

(

2

)

Fig

.

-

3

and

interlock

switch

(

2

)

Fig

.

1

are

pro

-

vided

between

the

breaker

and

metal

-

clad

unit

to

prevent

raising

or

lowering

of

the

breaker

in

the

unit

while

in

a

closed

position

and

to

prevent

a

closing

operation

when

the

breaker

is

not

in

either

the

fully

raised

or

lowered

position

.

A

,

plunger

can

also

be

provided

to

operate

an

additional

auxiliary

switch

mounted

in

the

metal

-

clad

unit

.

i

If

4

Courtesy of NationalSwitchgear.com

GEI

-

88766

Spring

Charging

«

r

The

mechanism

consists

of

a

high

speed

gear

motor

that

compresses

a

set

of

closing

springs

through

the

action

of

a

simple

eccentric

*

ratchet

*

and

pawl

assembly

.

The

rotary

action

of

the

motor

(

2

)

Fig

.

4

is

con

-

verted

to

a

short

straight

stroke

pumping

action

through

the

eccentric

(

6

)

and

a

lever

that

carries

a

spring

loaded

driving

pawl

(

5

)

.

The

pawl

advances

the

ratchet

wheel

(

3

)

Fig

.

3

only

a

few

degrees

each

stroke

where

it

is

held

in

position

by

the

latching

pawls

(

l

)

ratchet

wheel

has

been

rotated

approximately

l

80

degrees

the

closing

springs

(

6

)

will

be

fully

compressed

.

As

the

ratchet

wheel

continues

to

rotate

*

the

spring

load

will

shift

over

center

and

attempt

to

discharge

.

After

only

a

few

degrees

of

rotation

*

the

closing

roller

(

10

)

Fig

.

1

will

engage

the

closing

latch

(

ll

)

and

the

compressed

springs

will

be

held

in

repose

until

a

closing

operation

is

required

.

During

the

last

few

degrees

of

the

ratchet

wheel

rotation

the

motor

and

interlock

switch

-

es

(

6

)

are

released

and

the

driving

pawl

is

raised

from

the

ratchet

wheel

surface

.

This

allows

the

motor

and

driving

mechanism

to

coast

to

a

natural

stop

expending

all

residual

energy

.

During

the

time

the

springs

are

being

compressed

a

relay

(

6

)

Fig

,

o

locks

the

closing

power

circuits

open

and

the

relay

will

remain

energized

un

-

til

the

springs

are

fully

charged

and

the

control

contacts

are

re

-

set

.

The

closing

springs

may

be

charged

manually

if

control

voltage

is

lost

.

A

p

/

8

'

f

ratcnet

wrench

can

be

used

to

rotate

tne

eccentric

in

a

counter

clockwise

direction

until

the

indicator

reads

’

CHARGED

1

'

and

the

driving

pawl

no

longer

engages

the

ratchet

wheel

.

The

use

of

the

ratchet

wrench

provides

for

maximum

safety

in

the

event

that

control

power

is

suddenly

restored

without

warning

.

In

this

event

*

the

motor

drive

will

take

over

again

and

continues

to

charge

the

springs

.

When

the

m

W

Closing

Operation

Closing

the

breaker

Is

accomplished

by

energizing

the

closing

solenoid

or

by

manually

pressing

the

close

button

latch

is

removed

from

the

spring

blocking

location

allowing

the

springs

to

discharge

,

The

energy

of

the

springs

is

applied

to

the

rotation

of

a

cam

(

l

6

)

Fig

.

5

that

closes

the

breaker

through

a

simple

linkage

that

remains

trip

free

at

all

times

.

A

monitoring

switch

(

ll

)

Fig

.

6

on

the

closing

latch

will

start

the

spring

charging

motor

after

it

is

fully

reset

.

In

either

case

*

the

closing

mm

Ip

Opening

Operation

An

electrical

opening

operation

is

initiated

by

energising

the

trip

coil

.

This

is

accomplished

either

by

actuating

the

opening

cohtrol

switch

on

the

metal

-

clad

unit

or

by

a

combination

of

relays

and

current

devices

used

to

detect

.

a

fault

on

the

load

side

of

the

breaker

.

By

energizing

the

trip

coil

*

the

trip

plunger

rotates

the

trip

latch

{

7

)

s

Fig

.

5

caus

-

ing

the

operating

mechanism

,

linkage

to

collapse

The

energy

stored

in

m

D

Courtesy of NationalSwitchgear.com

GEI

-

88766

in

the

opening

springs

is

thus

released

,

opening

the

breaker

.

During

this

operation

*

the

trip

coil

circuit

is

deenergized

*

and

upon

comple

-

tion

of

the

opening

operation

,

the

operating

mechanism

is

returned

to

its

normal

position

*

ready

for

closing

.

As

the

breaker

opens

,

the

main

contacts

part

first

*

shunting

the

current

through

the

arcing

contacts

.

An

arc

forms

as

the

arcing

contacts

part

See

Fig

.

7

.

As

the

movable

arcing

nontact

(

7

)

is

moved

away

from

,

the

stationary

contact

*

the

upper

end

of

the

arc

is

transferred

to

the

upper

arc

runner

(

4

)

.

To

assist

the

interruption

at

this

point

,

a

stream

of

air

is

emitted

from

the

booster

tube

(

25

)

and

forces

the

arc

onto

the

lower

arc

runner

(

8

)

tically

inserts

the

blowout

coils

into

the

circuit

*

introducing

a

mag

-

netic

field

between

the

pole

pieces

which

tends

to

draw

the

arc

away

from

the

arcing

contacts

coils

and

three

lower

blowout

coils

each

individually

connected

in

ser

-

ies

with

its

respective

section

of

arc

runner

.

As

the

arc

is

forced

outward

along

the

diverging

arc

runners

*

the

magnetic

field

is

progress

-

ively

increased

with

the

addition

of

each

coil

in

the

circuit

.

At

the

same

time

*

the

arc

is

being

forced

into

the

arc

chute

(

3

)

which

is

composed

of

a

series

of

gradually

interleaving

insulating

fins

.

These

fins

*

which

project

alternately

from

the

two

opposite

inner

sur

-

faces

of

the

chute

*

elongate

the

arc

into

a

gradually

deepening

serpen

-

tine

path

*

so

that

the

electrical

resistance

in

the

path

of

the

arc

is

rapidly

increased

and

the

heat

from

the

arc

is

absorbed

resistance

reduces

both

the

magnitude

and

the

phase

angle

of

the

current

*

|

g

and

at

an

easily

current

-

zero

the

arc

path

is

so

long

and

the

gases

pro

-

duced

by

the

arc

so

cooled

that

the

arc

cannot

reestablish

itself

and

,

interruption

occurs

.

Manual

tripping

follows

the

same

procedure

except

that

instead

of

ener

-

gizing

the

trip

circuit

,

the

manual

trip

(

ll

)

Fig

.

2

is

used

.

i

Establishment

of

the

arc

on

the

runners

automa

-

The

interrupter

contains

three

upper

blowout

The

increased

Trip

Free

Operation

If

the

trip

coil

circuit

is

energized

while

the

breaker

is

closing

,

the

trip

plunger

will

force

the

trip

latch

(

8

)

Fig

.

5

away

from

the

trip

roller

(

9

)

causing

the

mechanism

linkage

to

collapse

and

the

breaker

to

The

closing

cam

(

16

)

will

complete

its

closing

stroke

and

the

re

-

open

springs

will

re

-

charge

as

in

a

normal

closing

operation

.

i

ADJUSTMENTS

All

adjustments

should

be

checked

during

periodic

inspections

and

when

-

ever

it

becomes

necessary

to

repair

or

replace

parts

that

have

become

worn

or

defective

while

in

service

.

The

following

adjustments

are

list

-

ed

in

the

order

in

which

they

are

to

be

checked

.

First

*

however

*

remove

the

breaker

from

the

metal

-

clad

unit

and

remove

the

rear

*

side

*

and

in

-

terphase

barriers

and

front

cover

.

m

£

o

Courtesy of NationalSwitchgear.com

GEE

-

88766

"

DO

NOT

WORK

ON

EITHER

THE

BREAKER

OR

MECHANISM

UNLESS

THE

CLOSING

SPRINGS

fftiARE

BLOCKED

AND

THE

OPENING

SPRINGS

HAVE

BEEN

TRIPPED

OPEN

OR

MECHANICALLY

'

BLOCKED

,

THIS

MEASURE

IS

REQUIRED

TO

PREVENT

ACCIDENTAL

CLOSING

OR

TRIP

-

PING

.

"

Primary

Contact

Wipe

When

the

breaker

is

closed

*

as

shown

in

Fig

.

8

,

the

stationary

primary

contacts

(

l

)

should

rise

5

/

16

”

4

»

0

—

l

/

l

6

"

on

the

1200

A

,

breaker

and

1

/

4

'

V

0

“

l

/

l

6

ff

on

3000

A

breakers

,

Before

checking

this

dimension

be

sure

the

mechanism

is

re

-

set

so

that

the

prop

(

13

)

Fig

.

5

is

resting

p

on

the

prop

.

To

obtain

the

proper

contact

adjustment

*

open

the

breaker

wand

,

referring

to

Pig

.

9

>

loosen

the

check

nut

(

4

)

and

turn

the

adjusting

nut

(

3

)

.

Screwing

up

on

the

adjusting

nut

will

decrease

the

primary

con

-

tact

wipe

,

down

will

increase

it

.

Tighten

the

check

nut

*

close

the

break

-

er

and

recheck

the

wipe

.

With

the

primary

contact

wipe

correctly

adjusted

,

the

clearance

between

the

contact

arm

.

(

6

)

and

the

buffer

block

should

be

l

/

l

6

,

s

or

greater

(

as

shown

in

Fig

.

8

)

when

the

breaker

is

fully

closed

.

Arcing

Contact

Wipe

Refer

to

Fig

.

8

»

Close

the

breaker

until

the

arcing

contacts

just

touch

.

This

can

be

determined

with

the

use

of

a

circuit

continuity

tester

such

as

a

light

indicator

or

bell

set

.

In

this

position

*

the

gap

between

the

stationary

primary

contacts

(

1

)

and

the

movable

primary

contact

(

2

)

should

be

5

/

l

6

"

or

greater

.

This

setting

has

been

made

in

the

factory

,

.

and

no

adjustment

is

provided

.

A

wipe

of

less

than

5

/

16

"

is

usually

an

Vindication

that

the

arcing

contacts

need

to

be

replaced

.

When

making

this

check

*

also

see

that

the

movable

arcing

contact

(

5

)

passes

between

the

sides

of

the

arc

chute

throat

without

touching

.

Primary

Contact

Gap

Refer

to

Fig

.

9

-

With

the

breaker

closed

*

press

the

manual

trip

button

*

allowing

the

breaker

to

trip

open

normally

.

Do

not

force

the

contacts

open

wider

by

hand

.

The

gap

between

the

stationary

primary

contacts

(

5

)

and

the

movable

primary

contact

(

6

)

should

be

5

-

1

/

45

/

1611

-

1

/

8

"

for

the

1200

A

breaker

and

5

-

13

/

16

"

4

=

5

/

16

"

-

1

/

8

"

for

the

3000

A

breaker

,

change

this

gap

*

loosen

the

check

nut

(

17

)

*

Fig

.

5

and

turn

the

adjust

-

ing

nut

(

18

)

on

stud

(

19

)

«

Screwing

the

adjusting

nut

down

will

decrease

the

primary

contact

gap

.

Tighten

the

check

nut

and

re

-

measure

the

con

-

jjjjg

,

tact

gap

(

close

and

trip

the

breaker

before

checking

the

measurement

)

.

Trip

Latch

Wipe

TO

Refer

to

Fig

.

5

.

The

wipe

of

the

trip

latch

(

8

)

on

the

trip

roller

(

9

)

should

be

from

3

/

16

"

to

1

/

4

"

.

This

can

be

measured

by

putting

a

film

of

grease

on

the

latch

(

8

)

*

closing

the

breaker

part

way

*

and

tripping

.

The

mechanism

has

the

proper

trip

latch

wipe

when

the

latch

rests

against

the

stop

(

23

)

.

No

adjustment

is

provided

and

a

visual

Inspection

is

usually

all

that

is

required

.

If

this

setting

is

not

correct

*

look

for

insufficient

travel

of

the

trip

shaft

(

7

)

.

ft

7

Courtesy of NationalSwitchgear.com

GEI

-

38766

WHEN

WORKING

ON

THE

MECHANISM

IN

THE

CLOSED

POSITION

,

KEEP

FINGERS

CLEAR

OF

THE

LINKAGE

,

AS

ACCIDENTAL

TRIPPING

CAN

CAUSE

SEVERE

INJURY

„

0

kr

Trip

Latch

Clearance

Refer

to

Fig

.

5

„

With

the

breaker

in

the

tripped

position

and

the

clos

-

ing

springs

charged

,

check

the

clearance

between

the

trip

latch

(

8

)

and

the

trip

roller

(

9

)

.

It

should

measure

l

/

32

u

to

1

/

16

’

*

„

Prop

Clearance

Refer

to

Fig

,

5

,

With

the

breaker

closed

as

far

as

possible

,

that

is

,

with

the

springs

blocked

and

the

cam

(

l

6

)

rotated

so

that

the

prop

(

13

)

is

at

its

maximum

height

over

the

prop

(

l

4

)

,

the

clearance

between

the

prop

and

prop

should

be

1

/

16

"

to

3

/

32

”

,

No

adjustment

is

pro

-

vided

and

a

visual

inspection

is

usually

all

that

is

required

.

Release

Latch

Wipe

Refer

to

Fig

,

6

,

The

wipe

between

the

release

latch

(

3

)

and

roller

(

2

)

should

be

3

/

lor

"

to

1

/

4

”

,

If

re

-

setting

is

required

,

loosen

,

set

,

and

re

-

tighten

adjustment

nut

and

screw

(

4

)

.

Release

Latch

Monitoring

Switch

Hi

The

release

latch

must

be

fully

re

-

set

and

the

monitoring

switch

opera

-

ted

before

the

motor

will

start

.

The

switch

should

be

wiped

by

the

striker

so

that

the

clearance

between

the

striker

and

switch

mounting

bracket

(

20

)

Fig

,

6

is

1

/

321

'

or

less

.

To

obtain

this

adjustment

bend

the

switch

striker

.

Be

sure

the

latch

is

fully

re

-

set

before

making

any

adjustments

.

i

/

*

•

m

Motor

and

Relay

Switches

1

)

Fig

.

6

until

has

traveled

the

maximum

amount

(

about

180

de

-

and

rotate

switch

With

the

closing

springs

blocked

rotate

the

switch

cam

the

switch

striker

grees

rotation

of

cam

)

.

Loosen

mounting

bolt

support

(

15

)

until

the

gap

between

the

striker

(

8

)

and

support

(

15

)

is

/

32

”

or

less

.

1

Interlock

Switch

Wipe

m

Refer

to

Fig

.

10

.

Rotate

the

interlock

shaft

(

l

)

manually

clockwise

to

release

the

interlock

switch

arm

(

2

)

.

The

point

at

which

the

con

?

tacts

make

can

be

determined

with

a

circuit

continuity

tester

such

as

a

light

indicator

or

bell

set

.

To

obtain

adjustment

on

the

interlock

switch

(

3

)

5

bend

the

interlock

switch

arm

(

2

)

until

there

is

a

maximum

of

I

/

32

"

clearance

to

the

switch

mounting

plate

(

4

)

.

8

Courtesy of NationalSwitchgear.com

GHX

~

88766

^

Auxiliary

Switch

The

auxiliary

switch

Fig

*

11

is

mounted

on

the

left

side

of

the

operating

mechanism

.

The

shaft

of

the

position

indicator

(

8

)

operates

tllg

dtlM

-

liary

switch

shaft

which

opens

and

closes

the

!

ia

,

!

and

!

'

b

”

con

-

tacts

.

The

ffah

contacts

are

open

when

the

breaker

is

open

and

the

iab

!

'

contacts

are

open

when

the

breaker

is

closed

„

The

t

8

at

!

contacts

should

0

To

fee

when

the

breaker

primary

contact

gap

is

a

minimum

,

of

1

!

:

.

The

"

b

,

!

contacts

need

only

to

be

checked

to

see

that

they

are

open

when

the

breaker

is

closed

.

No

adjustment

is

provided

and

a

visual

inspection

is

usually

all

that

is

required

.

%

Driving

Pawl

Adjustment

The

driving

pawl

(

5

)

Fig

.

4

must

advance

the

ratchet

wheel

(

3

)

Fig

.

3

sufficiently

on

each

stroke

to

allow

the

latching

pawls

(

l

)

to

fall

into

the

ratchet

teeth

.

This

should

be

checked

with

the

maximum

closing

spring

load

against

the

driving

members

.

With

the

mechanism

unblocked

,

hand

charge

the

closing

springs

with

the

manual

charging

wrench

until

they

are

slightly

more

than

half

charged

.

Slowly

rotate

the

'

charging

wrench

until

the

driving

pawl

(

5

)

Fig

.

4

has

traveled

through

its

return

stroke

and

check

the

maximum

clearance

between

the

pawl

and

the

ratchet

tooth

.

Rotate

the

charging

wrench

until

the

driving

pawl

has

advanced

the

ratchet

tooth

to

its

maximum

travel

.

Now

check

the

clearance

between

the

ratchet

tooth

and

the

latching

pawl

(

1

)

Fig

.

3

.

The

clearance

should

^

be

approximately

equal

for

both

the

driving

and

latching

pawls

and

not

less

than

*

015

,

?

in

either

case

.

If

adjustment

is

required

for

either

pawl

the

springs

must

first

he

fully

charged

and

blocked

.

Loosen

seven

motor

support

bolts

(

l

)

Fig

.

15

and

move

entire

motor

assembly

to

the

rear

if

the

clearance

is

under

the

minimum

,

at

the

latching

pawls

,

and

to

the

front

if

the

clearance

is

un

-

der

the

minimum

,

at

the

driving

pawl

.

Move

the

motor

assembly

approxi

-

mately

twice

the

dimensional

Increase

required

at

the

pawl

.

Be

certain

the

motor

assembly

is

moved

straight

forward

or

rearward

and

tighten

the

one

bolt

on

the

right

side

of

the

mounting

frame

first

to

assure

proper

alignment

.

After

tightening

the

remaining

bolts

the

springs

should

foe

released

and

the

clearance

again

checked

as

described

above

.

AUXILIARY

DEVICES

I

&

W

Latch

Checking

Switch

Refer

to

Fig

.

12

,

Rotate

the

trip

latch

(

4

)

clockwise

(

looking

at

the

left

side

of

the

mechanism

)

by

pressing

the

manual

trip

lever

to

open

the

latch

checking

switch

operating

am

(

3

)

.

Allow

the

trip

latch

to

reset

slowly

and

determine

the

point

at

which

the

contacts

make

by

using

a

circuit

continuity

tester

,

such

as

a

light

indicator

or

bell

set

9

The

contacts

of

the

latch

checking

switch

should

just

make

when

the

gap

be

-

tween

the

trip

latch

(

4

)

and

the

stop

(

5

)

located

on

the

crank

(

?

)

is

l

/

l

6

”

.

There

should

be

a

minimum

of

l

/

b

4

S

!

between

the

operating

arm

|

(

3

)

Fig

.

12

and

the

switch

support

(

l

)

.

To

obtain

adjustment

of

the

latch

checking

switch

(

2

)

bend

the

latch

checking

switch

operating

arm

(

3

)

o

9

Courtesy of NationalSwitchgear.com

GEI

-

88766

Plunger

Interlock

«

Refer

to

Fig

,

.

13

»

With

the

breaker

in

the

open

position

,

the

vertical

distance

"

A

”

from

the

top

of

the

interlock

bolt

(

l

)

to

the

bottom

of

the

elevating

bar

(

3

)

should

be

10

-

7

/

32

"

plus

or

minus

1

/

16

"

.

To

change

this

adjustment

,

add

or

remove

washers

(

2

)

.

Inspection

and

Test

1

.

For

ease

in

reviewing

the

adjustmentss

the

following

are

recapitulated

;

a

.

Primary

contact

wipe

;

5

/

3.6

"

+

O

-

1

/

16

"

1200

A

,

i

/

4

,

!

4

>

0

“

=

1

/

16

"

3000

A

.

b

.

Arcing

contact

wipe

;

c

.

Primary

contact

gap

;

-

1

/

8

"

3000

A

.

d

.

Trip

latch

wipe

:

3

/

16

"

to

1

/

4

,

r

with

trip

latch

resting

against

stop

,

e

.

Trip

latch

clearance

:

1

/

32

"

to

l

/

l

6

"

.

f

.

Prop

clearance

:

l

/

l

6

"

to

5

/

32

"

,

3

/

16

"

to

1

/

4

"

.

h

.

Release

latch

monitoring

switch

:

maximum

,

clearance

1

/

32

"

.

i

.

Motor

and

relay

switch

;

maximum

clearance

1

/

32

"

.

j

.

Interlock

switch

;

maximum

clearance

1

/

32

"

.

k

.

Auxiliary

switch

"

a

"

contacts

close

when

breaker

primary

contact

gap

is

1

"

or

greater

.

l

.

Driving

and

Latching

Pawl

:

minimum

,

clearance

to

ratchet

teeth

.

015

"

.

m

.

Latch

checking

switch

contacts

make

when

the

gap

between

the

trip

latch

and

the

stop

is

l

/

l

6

fl

„

n

.

Plunger

interlock

;

10

-

7

/

32

"

plus

or

minus

1

/

16

"

.

I

:

5

/

16

"

or

greater

(

gap

at

primary

contacts

)

.

:

5

-

1

/

4

"

+

5

/

16

"

-

1

/

8

"

1200

A

.

,

5

-

13

/

16

"

+

5

/

16

"

g

.

Release

latch

wipe

;

2

.

Check

all

nuts

,

washers

,

bolts

,

cotter

pins

,

and

terminal

connections

for

tightness

.

3

.

Inspect

all

wiring

to

make

sure

that

no

damage

has

resulted

during

installation

,

and

test

for

possible

grounds

or

short

circuits

,

4

.

See

that

all

bearing

surfaces

of

the

mechanism

have

been

lubricated

.

Refer

to

the

section

on

LUBRICATION

.

5

.

Operate

the

breaker

slowly

with

the

manual

charging

wrench

and

note

that

there

is

no

excessive

binding

or

friction

and

that

the

breaker

can

be

moved

to

the

fully

opened

and

fully

closed

positions

.

6

.

See

that

any

place

where

the

surface

of

the

paint

has

been

damaged

is

repainted

immediately

.

7

.

Check

the

trip

coil

plunger

and

the

release

coil

plunger

to

see

that

they

move

freely

.

I

<

10

Courtesy of NationalSwitchgear.com

GEI

-

88766

Opening

and

Closing

Speeds

w

.

-

The

closing

speed

of

the

arcing

contact

of

the

breaker

should

be

a

mini

-

mum

of

11

feet

per

second

.

This

represents

the

average

speed

of

the

movable

arcing

contact

over

1

”

of

travel

before

engaging

the

stationary

contact

.

The

opening

speed

of

the

arcing

contact

should

be

a

minimum

of

15

feet

per

second

.

This

represents

the

average

speed

over

3

"

of

travel

after

contact

parting

.

Control

Power

Check

i

:

'

S

-

After

the

mechanism

,

has

been

closed

and

opened

slowly

several

times

with

the

maintenance

closing

wrench

and

the

mechanism

adjustments

are

checked

as

described

,

the

operating

voltages

should

be

checked

at

the

release

coil

,

trip

coil

,

and

motor

terminals

.

For

electrical

operation

of

the

mechanism

,

the

control

power

may

be

either

an

alternating

or

direct

cur

-

rent

source

.

The

operating

ranges

for

the

closing

and

tripping

voltages

are

given

on

the

breaker

nameplate

.

The

following

ranges

are

standard

;

Nominal

Voltage

Closing

Range

Tripping

Range

Min

.

Min

.

Max

.

Max

.

\

:

'

(

M

48

v

d

-

c

llOv

d

-

c

125

v

d

-

c

220

v

d

-

c

250

v

d

-

e

115

v

a

-

c

230

v

a

-

c

34

28

60

v

d

-

c

125

v

d

-

c

—

l

40

v

d

—

c

250

v

d

-

c

2

§

Ov

d

-

c

125

v

a

-

c

250

v

a

-

c

50

v

d

-

c

115

v

d

-

c

130

v

d

-

e

230

v

d

-

c

2

§

0

v

d

-

c

125

v

a

-

c

250

v

a

-

c

80

60

90

70

160

120

180

140

95 95

190

If

the

closed

circuit

voltage

at

the

terminals

of

the

coil

or

motor

does

not

fall

in

the

specified

range

,

check

the

voltage

at

the

source

of

pow

-

er

and

line

drop

between

the

power

source

and

breaker

.

When

two

or

more

breakers

operating

from

the

same

control

power

source

are

required

to

close

simultaneously

,

the

closed

circuit

voltage

at

the

closing

coil

or

motor

of

each

breaker

must

fall

within

the

specified

limits

.

SR

r

/

Electrical

closing

or

opening

is

accomplished

by

merely

"

energizing

the

closing

or

trip

coil

circuit

.

Control

switches

are

provided

for

this

purpose

on

the

raetal

-

elad

unit

.

It

is

also

possible

to

trip

or

close

the

breaker

manually

by

pressing

the

manual

trip

lever

(

ll

)

Fig

.

2

or

the

manual

close

button

(

7

)

.

4

w

11

Courtesy of NationalSwitchgear.com

GEI

-

88766

Before

the

breaker

Is

finally

raised

into

position

In

the

metal

-

clad

unit

*

§

rub

a

small

amount

of

G

E

contact

lubricant

D

50

H

47

on

the

silvered

por

-

tion

of

the

breaker

studs

to

form

a

thin

coating

for

contacting

purposes

,

GENERAL

MAINTENANCE

Dependable

service

and

safer

power

equipment

are

contingent

upon

the

un

-

failing

performance

of

the

power

circuit

breaker

.

To

maintain

such

ser

-

vice

*

it

is

recommended

that

a

definite

inspection

and

maintenance

sched

-

ule

be

set

up

and

followed

*

as

serious

shutdowns

can

often

be

avoided

by

locating

potential

sources

of

trouble

in

an

early

stage

.

A

periodic

lubrication

of

parts

subject

to

wear

is

also

vitally

important

for

the

successful

operation

of

the

breaker

.

I

BEFORE

ANY

MAINTENANCE

WORK

IS

PERFORMED

*

MAKE

CERTAIN

THAT

ALL

CONTROL

CIRCUITS

ARE

OPENED

AND

THAT

THE

BREAKER

IS

REMOVED

FROM

THE

METAL

-

CLAD

UNIT

.

DO

NOT

WORK

ON

THE

BREAKER

OR

MECHANISM

WHILE

IN

THE

CLOSED

POSI

-

TION

UNLESS

THE

PROP

AND

TRIP

LATCH

HAVE

BEEN

SECURELY

WIRED

OR

BLOCKED

TO

PREVENT

ACCIDENTAL

TRIPPING

.

DO

NOT

WORK

ON

THE

BREAKER

OR

MECHANISM

WHILE

THE

SPRINGS

ARE

CHARGED

UNLESS

THEY

ARE

SECURED

IN

THAT

POSITION

BY

THE

MAINTENANCE

SPRING

BLOCICING

DEVICE

.

Periodic

Inspection

The

frequency

of

periodic

inspection

should

be

determined

by

each

opera

-

company

on

the

basis

of

the

number

of

operations

(

including

switch

-

the

magnitude

of

currents

Interrupted

*

and

any

unusual

operations

ting

ing

)

*

which

occur

from

time

to

time

.

Operating

experience

will

soon

establish

a

maintenance

schedule

which

will

give

assurance

of

proper

breaker

con

-

dition

.

On

installations

where

a

combination

of

fault

duty

and

repeti

-

tive

operation

is

encountered

*

an

inspection

is

recommended

after

any

severe

fault

operation

.

The

following

instructions

list

the

main

points

to

be

included

in

an

inspection

and

*

a

number

of

general

recommendations

.

I

Arc

Chutes

It

is

not

necessary

to

inspect

the

arc

chutes

unless

there

is

evidence

of

damage

or

if

the

arc

chutes

are

removed

for

any

reason

.

When

inspect

-

ing an

arc

chute

*

it

should

be

disassembled

and

the

following

points

noted

:

1

.

Scale

formed

over

the

surface

of

the

arc

chute

must

not

be

removed

*

but

loose

particles

collected

in

the

chute

should

be

blown

out

.

2

.

Cracks

which

have

formed

in

the

fins

of

the

arc

chute

are

to

foe

ex

-

pected

in

ceramic

materials

of

this

type

when

subjected

to

the

severe

heat

of

an

arc

.

These

cracks

do

not

interfere

with

the

operation

of

the

device

in

any

way

and

should

be

disregarded

.

4

12

Courtesy of NationalSwitchgear.com

GEI

-

88766

3

-

If

the

ape

chute

has

suffered

any

mechanical

injury

due

to

dropping

or

accidental

striking

,

resulting

In

the

actual

breaking

off

of

fins

*

Small

broken

corners

on

.

v

-

\

v

5

’

:

replacement

of

the

chute

will

be

necessary

.

the

exhaust

end

.

of

the

chute

will

not

interfere

with

its

performance

and

can

also

be

disregarded

.

4

,

The

plastisol

flexible

covering

for

the

pole

pieces

(

4

)

Fig

.

16

should

If

there

are

holes

or

be

inspected

for

breaks

in

the

insulation

,

breaks

in

the

insulation

they

should

be

repaired

or

the

part

replaced

.

Arc

Chute

Removal

;

:

p

|

The

arc

chutes

of

the

13.8

K

7

breakers

require

a

mechanical

aid

to

re

-

:

move

and

replace

them

at

general

maintenance

periods

.

This

can

be

ac

-

complished

by

an

overhead

crane

,

a

portable

hoist

*

or

by

an

arc

chute

lifter

especially

designed

for

this

purpose

.

The

arc

chute

lifter

(

16

)

Fig

.

19

bolts

on

the

top

plate

of

the

breaker

*

in

line

with

the

chute

to

be

removed

*

and

will

lift

*

transport

*

and

re

-

lease

the

chute

as

necessary

.

To

use

the

Arc

Chute

Lifter

proceed

as

follows

:

1

.

Remove

bolts

at

the

top

and

bottom

of

the

rear

barrier

and

remove

the

rear

barrier

.

2

.

Remove

the

side

and

interphase

barriers

by

sliding

to

the

rear

.

3

.

Remove

3

top

plate

bolts

and

mount

the

lifter

support

angle

(

13

)

Fig

.

19

.

Place

arc

chute

lifter

(

16

)

over

the

front

bushing

on

the

proper

pole

and

insert

into

the

proper

hole

in

the

support

angle

.

5

»

Loosen

two

upper

support

bolts

(

2

)

,

(

Left

and

right

)

6

.

Loosen

the

lower

electrical

connection

bolt

(

9

)

«

.

Roll

arc

chute

to

the

rear

of

the

support

platform

.

Lower

the

grappling

hooks

(

17

)

by

turning

handle

counter

clockwise

until

the

hooks

can

be

placed

in

the

lifting

holes

provided

in

the

top

of

the

arc

chute

side

support

.

9

.

Turn

handle

clockwise

until

arc

chute

is

lifted

from

the

platform

,

10

.

Move

trolly

(

15

)

to

the

rear

until

arc

chute

is

clear

of

the

platform

.

11

.

Turn

handle

of

the

arc

chute

lifter

counter

clockwise

until

arc

chute

is

resting

on

the

floor

.

12

.

Reassemble

arc

chutes

on

the

breaker

in

the

reverse

order

of

items

5

to

11

above

.

«

4.3

.

When

the

arc

chute

has

been

replaced

*

check

to

see

if

both

upper

44

'

support

bolts

(

2

)

and

lower

connection

bolts

(

9

)

have

been

tightened

.

The

upper

bolts

serve

as

both

a

mechanical

and

electrical

connection

.

Breaker

Contacts

By

removing

the

rear

*

side

*

and

interphase

barriers

the

movable

and

sta

-

tionary

primary

contacts

and

the

movable

arcing

contacts

can

be

inspect

-

ed

.

The

stationary

arcing

contacts

can

only

be

inspected

when

the

arc

chute

has

been

rolled

to

the

rear

of

the

breaker

.

This

can

be

accom

-

r

.

pushed

by

loosening

the

two

upper

bolts

(

2

)

Fig

,

19

and

one

lower

bolt

|

4

(

9

)

and

rolling

the

chute

to

the

rear

of

the

breaker

platform

.

13

Courtesy of NationalSwitchgear.com

GEI

-

88766

If

the

contacts

are

burned

and

pitted

,

they

should

,

be

made

smooth

with

a

fine

file

.

ft

After

completing

inspection

of

contacts

,

check

the

contact

adjustments

as

specified

under

ADJUSTMENTS

.

Mechani

stu

A

careful

inspection

should

be

made

to

check

for

loose

nuts

or

bolts

and

broken

retaining

rings

.

All

cam

,

roller

,

and

latch

surfaces

should

be

inspected

for

any

evidence

of

damage

or

excessive

wear

.

Lubricate

the

mechanism

as

outlined

below

,

then

,

using

the

manual

charging

wrench

,

and

close

the

breaker

several

times

to

make

certain

that

the

mechanism

operates

freely

throughout

its

entire

stroke

.

Check

the

mechanism

ad

-

justments

as

specified

under

ADJUSTMENTS

.

Check

all

terminal

connections

.

open

ij

VYI

Bushings

and

Insulation

The

surface

of

the

bushings

should

be

kept

clean

and

unmarred

to

prevent

moisture

absorption

.

If

the

insulation

surface

should

become

damaged

,

it

should

be

sanded

and

cleaned

,

and

should

be

refinished

with

either

clear

varnish

or

clear

resin

insulation

parts

on

the

breaker

should

be

kept

clean

and

dry

.

Smoke

or

dust

collected

between

inspection

periods

should

be

wiped

off

,

and

if

dampness

is

apparent

,

heaters

should

be

installed

to

insure

dryness

.

All

other

Allow

to

dry

smooth

and

hard

.

Insulation

Test

When

insulation

has

been

repaired

or

replaced

,

or

when

breaker

has

been

stored

under

adverse

conditions

,

it

is

recommended

that

the

insulation

be

checked

before

the

breaker

is

placed

in

service

.

A

standard

60

cycle

high

potential

test

at

27

,

000

volts

RMS

will

normally

indicate

whether

the

breaker

is

satisfactory

for

service

.

With

the

breaker

contacts

in

the

fully

open

position

,

apply

the

high

potential

to

each

terminal

of

the

breaker

individually

for

one

minute

with

all

other

terminals

and

the

breaker

frame

grounded

ganic

insulating

materials

,

these

materials

should

be

inspected

for

visible

leakage

current

paths

,

and

necessary

action

must

be

taken

to

re

-

place

insulation

that

may

have

been

affected

by

moisture

absorption

.

If

the

breaker

secondary

wiring

is

to

be

given

a

hi

-

potential

test

at

1500

volts

,

remove

both

of

the

motor

leads

from

the

terminal

boards

.

Failure

to

disconnect

the

motor

from

the

circuit

may

cause

damage

to

the

winding

insulation

.

After

high

potential

tests

are

made

on

or

-

m

LUBRICATION

In

order

to

maintain

reliable

operation

,

it

is

important

that

all

cir

-

cuit

breakers

be

properly

lubricated

at

all

times

.

Most

of

the

bearings

and

rolling

surfaces

utilize

a

new

type

of

dry

insulation

that

will

re

-

quire

no

maintenance

and

will

last

the

life

of

the

equipment

.

Only

few

#

14

Courtesy of NationalSwitchgear.com

QEI

-

88766

bearings

and

surfaces

listed

in

.

the

chart

.

Fig

,

20

,

require

lubrication

.

These

have

been

properly

lubricated

,

during

assembly

at

the

factory

,

us

-

ing

the

finest

grades

of

lubricants

available

.

,

However

,

even

the

finest

oils

and

greases

have

a

tendency

to

oxidise

with

age

,

as

evidenced

by

hardening

and

darkening

in

color

.

Elimination

of

the

hardened

lubricant

is

essential

for

the

proper

operation

of

circuit

breakers

.

Also

frequent

operation

of

the

breaker

causes

the

lubricant

to

be

forced

out

from

,

be

-

tween

the

bearing

surfaces

,

A

simple

lubrication

will

often

clear

up

minor

disturbances

which

might

be

mistaken

for

more

serious

trouble

.

A

definite

lubrication

schedule

should

be

set

up

taking

into

considera

-

tion

the

frequency

of

operation

of

the

breaker

and

local

conditions

.

It

Until

such

a

schedule

is

worked

out

,

the

breaker

should

be

lubricated

at

¥

each

periodic

inspection

and

also

whenever

it

is

overhauled

,

in

accord

-

ance

with

the

lubrication

chart

,

Fig

.

20

.

It

is

also

recommended

that

all

circuit

breakers

be

operated

at

regular

intervals

to

Insure

the

user

that

the

equipment

is

operating

freely

.

The

lubrication

chart

.

Fig

.

20

,

is

divided

into

two

methods

of

lubrica

-

tion

.

The

first

method

outlines

the

maintenance

lubrication

which

should

be

performed

at

the

time

of

periodic

maintenance

,

and

requires

no

dis

-

assembly

.

The

second

method

outlines

a

lubrication

procedure

similar

to

that

performed

on

the

breaker

at

the

factory

,

but

should

be

used

only

in

case

of

a

general

overhaul

or

disassembly

for

other

reasons

,

or

if

the

operation

of

the

breaker

becomes

slower

.

General

Electric

Lubricants

D

50

H

15

and

D

50

H

47

are

available

in

1

/

4

#

col

-

lapsible

tubes

.

It

is

so

packaged

to

insure

cleanliness

and

to

prevent

l

oxidation

.

m

Method

of

Gleaning

Bearings

'

Whenever

cleaning

is

required

,

as

indicated

in

the

lubrication

chart

,

the

following

procedures

are

recommended

:

Sleeve

Bearings

The

sleeve

bearings

used

throughout

the

linkage

utilise

Teflon

surfaces

and

do

not

require

lubrication

,

face

will

acquire

a

thin

black

film

,

Do

not

remove

this

film

unless

there

is

evidence

of

outside

contaminates

,

such

as

dry

or

hardened

grease

.

If

contaminants

are

present

they

should

be

removed

by

immersing

the

link

|

and

bearing

in

/

clean

petroleum

solvent

or

similar

cleaner

and

using

a

stiff

brush

.

Bo

not

remove

the

bearings

from

the

links

.

DO

NOT

USE

CAR

-

BON

TETRACHLORIDE

,

The

hinge

of

the

primary

contact

arm

(

24

)

Fig

.

7

should

be

disassembled

,

cleaned

,

and

lubricated

with

G

-

E

D

50

H

47

lubricant

at

general

overhaul

periods

.

The

main

shaft

bearings

(

24

)

Fig

.

5

and

the

driving

pawl

lever

bearing

should

be

removed

,

cleaned

,

and

lubricated

with

G

-

E

B

5

QH

15

lubricant

at

general

overhaul

periods

,

After

a

number

of

operations

,

the

sur

~

&

15

Courtesy of NationalSwitchgear.com

GEL

-

88766

Roller

&

Needle

Bearings

lf

|

:

The

cam

follower

bearings

(

6

)

Rig

.

5

s

latch

roller

bearing

{

9

}

*

and

cam

shaft

bearings

(

25

)

Fig

.

5

should

be

first

removed

from

the

mechanism

,

and

the

inner

race

disassembled

.

They

should

then

be

placed

in

a

container

of

clean

petroleum

solvent

or

similar

cleaner

.

DO

NOT

USB

CARBON

TETRG

-

CHLORIDE

0

If

the

grease

in

the

bearings

has

become

badly

oxidized

,

it

may

be

necessary

to

use

alcohol

(

type

used

for

thinning

shellac

)

to

re

-

move

it

.

Ordinarily

*

by

agitating

the

bearings

in

the

cleaning

solution

,

and

using

a

stiff

brush

to

remove

the

solid

particles

*

the

bearings

can

be

satisfactorily

cleaned

.

Do

not

handle

the

bearings

with

bare

hands

as

deposits

from

the

skin

onto

the

bearings

are

inductive

to

corrosion

.

If

the

bearings

are

touched

,

the

contamination

can

be

removed

by

wash

-

ing

in

alcohol

.

After

the

bearings

have

been

thoroughly

cleaned

*

spin

them

in

clean

new

light

machine

oil

until

the

cleaner

or

solvent

is

en

-

tirely

removed

.

Allow

this

oil

to

drain

off

and

then

repack

them

im

-

mediately

with

G

-

E

lubricant

D

50

H

15

being

sure

all

metal

parts

are

greased

.

The

removable

seals

should

then

be

replaced

.

NOTE

;

If

it

becomes

necessary

to

clean

the

bearings

in

alcohol

(

shellac

thinner

)

*

be

sure

the

alcohol

is

perfectly

clean

*

and

do

not

allow

the

bearings

to

remain

in

the

alcohol

more

than

a

few

hours

.

If

It

Is

desir

-

able

to

leave

the

bearings

in

the

alcohol

for

a

longer

time

*

an

inhibit

-

ed

alcohol

such

as

is

used

for

anti

-

freeze

should

be

used

.

Even

then

the

bearings

should

be

removed

from

the

alcohol

within

twenty

-

four

hours

.

Esso

Anti

-

Freeze

and

Du

Pont

Zerone

are

satisfactory

for

this

purpose

.

Precautions

against

the

toxic

effects

of

the

alcohol

must

‘

be

exercised

by

wearing

rubber

gloves

and

by

using

the

alcohol

in

a

well

ventilated

room

;

excessive

exposure

to

the

fumes

is

sometimes

unpleasant

to

person

-

nel

.

Washing

the

bearings

In

the

light

oil

and

draining

should

follow

immediately

*

then

apply

the

lubricant

.

Bearings

that

are

pressed

into

the

frame

or

other

members

such

as

the

eccentric

drive

bearings

(

7

)

Fig

.

15

should

not

be

removed

.

After

re

-

moving

the

shaft

and

inner

race

the

bearing

can

usually

be

cleaned

satis

-

factorily

with

petroleum

solvent

or

a

similar

cleaner

and

a

stiff

brush

.

Follow

the

procedure

outlined

above

using

a

light

machine

oil

and

G

-

E

lubricant

D

50

H

15

before

reassembling

the

inner

race

and

shaft

.

<

fp

#

Rolling

Surfaces

t

A

number

of

rolling

and

rubbing

surfaces

in

the

mechanism

have

been

lu

-

bricated

with

a

baked

-

on

*

dry

*

molybdenum

disulfide

coating

.

This

re

-

quires

no

maintenance

and

should

last

the

life

of

the

breaker

.

|

Sfc

16

Courtesy of NationalSwitchgear.com

OBI

-

88766

RECOMMENDED

MAINTENANCE

FOR

MAONE

-

EIAST

BREAKERS

APPLIED

TO

REPETITIVE

SWITCHING

DUTY

;

~

—

-

•

s

.

'

I

.

Magne

-

blasfe

breakers

applied

to

repetitive

switching

duty

should

be

serviced

and

maintained

according

to

the

following

schedule

;

A

.

Every

500

Operations

*

or

Every

Six

Months

-

Whichever

Comes

First

1

.

Remove

the

rear

*

side

,

and

inter

phase

barriers

.

2

o

Wipe

all

insulating

parts

clean

of

smoke

deposit

-

and

dust

with

a

clean

dry

cloth

,

including

the

bushings

,

and

the

inside

of

the

barriers

.

I

3

.

All

parts

in

the

throat

area

of

the

arc

chute

should

be

thorough

-

ly

cleaned

by

using

sandpaper

.

This

cleaning

should

be

perform

-

ed

any

time

the

arc

chute

is

removed

.

The

arc

chute

fins

should

not

be

cleaned

.

Whenever

the

arc

chute

is

removed

,

loose

dust

and

dirt

should

be

blown

out

before

replacing

arc

chutes

.

B

.

Every

1000

Operations

,

or

Every

Six

Months

-

Whichever

Comes

First

1

.

In

addition

to

the

servicing

done

each

500

operations

,

the

breaker

contacts

,

breaker

adjustments

,

and

mechanism

adjust

-

ments

should

be

checked

.

2

.

Primary

Contacts

-

Inspect

the

condition

of

the

stationary

con

-

tact

fingers

and

movable

contact

blocks

.

Badly

pitted

or

burn

-

ed

contacts

should

be

replaced

.

(

Note

:

burned

primary

contacts

indicate

the

probable

need

for

arcing

contact

replacement

.

)

If

the

contact

surfaces

are

only

roughened

or

galled

,

they

should

be

smoothed

with

crocus

cloth

or

draw

filed

.

After

contact

dressing

the

contacts

should

be

greased

with

a

-

very

thin

film

of

G

.

E

.

contact

lubricant

D

50

H

47

.

3

.

Arcing

Contacts

-

When

the

arcing

contact

wipe

is

less

than

the

minimum

specified

under

ADJUSTMENTS

,

page

6

,

the

contacts

should

be

replaced

.

The

contacts

should

be

Inspected

for

uneven

wear

and

/

or

damage

using

a

mirror

to

inspect

the

stationary

contacts

.

Normally

it

will

not

be

necessary

to

remove

the

arc

chutes

for

this

1000

operation

servicing

unless

inadequate

wipe

or

contact

conditions

indicate

a

need

for

replacement

.

If

the

arc

chutes

are

removed

,

the

contact

braids

and

other

parts

subject

to

arc

-

ing

should

be

checked

for

possible

cleaning

or

replacement

.

Do

not

grease

the

arcing

contacts

under

any

circumstances

.

4

.

Check

the

breaker

and

mechanism

adjustments

as

summarised

under

INSPECTION

AND

TEST

,

page

10

.

The

necessary

readjustments

should

be

made

as

described

under

ADJUSTMENTS

,

page

6

.

I

17

Courtesy of NationalSwitchgear.com

CfEI

-

88766

The

breaker

and

operating

mechanism

should

be

carefully

inspect

-

ed

for

loose

nuts

.

,

bolts

*

retaining

rings

*

etc

.

*

all

cam

*

latch

*

and

roller

surfaces

should

be

inspected

for

damage

or

excessive

wear

.

the

stationary

contact

support

should

be

inspected

for

possible

need

of

replacement

.

5

.

«

The

buffer

blocks

and

their

retainers

on

the

bottom

of

6

.

The

contacts

of

the

controls

relay

should

be

inspected

for

ex

-

cessive

wear

or

burning

.

Recondition

or

replace

contacts

if

necessary

.

Lubricate

the

breaker

operating

mechanism

,

in

accordance

with

the

table

under

paragraph

heading

LUBRICATION

*

page

14

.

Inspect

all

wiring

for

tightness

of

connections

and

possible

damage

to

insulation

,

After

the

breaker

has

been

serviced

*

it

should

be

closed

and

opened

slowly

by

using

the

manual

closing

handle

to

be

sure

there

is

no

binding

or

friction

and

that

.

the

breaker

contacts

can

move

to

the

fully

opened

and

fully

closed

positions

.

Its

electrical

operation

should

then

be

checked

using

either

the

test

cabinet

or

the

test

couplers

.

i

7

.

S o

9

.

o

C o

Every

5000

Operations

*

or

Approximately

Every

Five

Years

-

Whlch

-

ever

Comes

First

.

«

In

addition

to

the

servicing

done

each

1000

operations

*

the

breaker

should

be

given

a

general

inspection

and

overhaul

as

required

.

All

excessively

worn

parts

in

both

the

mechanism

and

the

breaker

should

be

replaced

.

Such

wear

will

usually

be

in

-

dicated

when

the

breaker

cannot

be

adjusted

to

indicated

toler

-

ances

.

This

overhaul

and

inspection

is

more

detailed

and

may

require

disassembly

of

mechanism

and

breaker

operating

parts

.

The

arc

chutes

should

be

removed

from

,

the

breaker

and

disassem

-

bled

to

permit

a

detailed

inspection

of

insulation

*

blow

-

out

coils

*

and

arc

runners

.

The

blow

-

out

coils

should

be

carefully

examined

and

if

the

in

-

sulation

has

been

cracked

*

shrunk

,

or

eroded

from

arc

action

and

heat

so

that

the

turns

of

the

coils

are

not

fully

insulated

from

each

other

*

the

coils

should

be

replaced

.

All

connections

should

be

checked

for

.

tightness

.

1

*

2

,

3

«

f

4

.

The

arc

runners

should

be

inspected

and

replaced

when

any

part

of

their

area

has

been

reduced

to

25

^

of

the

original

metal

thickness

as

a

result

of

arc

erosion

.

#

18

Courtesy of NationalSwitchgear.com

GBJ

-

88766

5

*

Check

the

stationary

arcing

contacts

to

assure

that

the

arcing

contacts

are

in

good

condition

and

that

their

connections

are

tight

.

6

.

Insulating

material

that

is

carbonized

and

cannot

be

satisfac

-

torily

cleaned

should

be

replaced

.

7

.

Any

parts

damaged

or

severely

burned

and

/

or

eroded

from

arc

action

should

be

replaced

.

8

.

Note

;

Fine

cracks

may

develop

in

the

fins

of

the

arc

chute

sides

.

This

is

to

be

expected

with

ceramic

materials

when

sub

-

jected

to

the

high

heat

of

an

arc

and

may

be

disregarded

unless

they

are

long

and

present

a

possibility

of

fin

sections

break

-

ing

off

completely

.

Small

broken

corners

on

the

exhaust

end

of

the

arc

chute

will

not

interfere

with

its

performance

and

can

also

be

disregarded

.

9

.

The

trip

roller

and

trip

shaft

bearings

in

the

operating

mecha

-

nism

should

be

disassembled

,

cleaned

*

and

repacked

with

G

.

E

.

Lubricant

D

50

H

15

as

described

under

LUBRICATION

*

page

14

.

10

.

The

cup

bearing

at

the

hinge

point

of

the

contact

blade

should

be

disassembled

*

cleaned

*

and

relubricated

with

G

.

E

.

Contact

Lubricant

D

50

H

47

,

Contact

rings

at

the

hinge

point

between

the

contact

blade

and

bushing

may

be

lubricated

for

prolonged

life

.

The

contact

rings

should

be

inspected

for

wear

and

re

-

placed

when

reduced

in

thickness

to

less

than

l

/

32

lf

•

11

.

The

stationary

primary

contact

fingers

should

be

disassembled

and

the

silver

-

plated

pivot

area

of

the

contact

and

contact

support

cleaned

and

relubricated

with

G

.

E

,

Contact

Lubricant

D

50

H

47

.

ft

§

1

»

i

|

12

.

The

breaker

and

operating

mechanism

should

be

serviced

as

de

-

scribed

for

every

1000

operations

and

properly

adjusted

before

being

put

back

into

service

.

TROUBLE

SHOOTING

Failure

of

a

breaker

to

operate

properly

will

generally

fall

within

four

general

classes

^

failure

to

trip

*

failure

to

close

or

latch

closed

*

clos

-

ing

springs

will

not

recharge

*

and

overheating

.

The

following

is

a

brief

outline

showing

particular

types

of

distress

that

might

be

encountered

*

together

with

suggestions

for

remedying

the

trouble

;

Failure

to

Trip

1

.

Mechanism

binding

or

sticking

caused

by

lack

of

lubrication

,

REMEDY

;

Lubricate

complete

mechanism

.

a

19

Courtesy of NationalSwitchgear.com

GE Magne-Blast AM-13.8-1000-3H User manual

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