GE POWER/VAC GEK 86132A Bedienungsanleitung

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1

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GEK

8.6

-

132

B

SUPERSEDES

GEK

86

!

!

32

A

INSTRUCTIONS

POWER

/

VAC

*

VACUUM

CIRCUIT

BREAKER

WITH

ML

-

18

MECHANISM

v

-

Courtesy of NationalSwitchgear.com

«

...

y

CONTENTS

Page

No

.

1

1

.

INTRODUCTION

1.1

.

Safety

.

.

.

1.1

.

1

,

General

1.1

.

2

.

Specific

2

.

DESCRIPTION

3

.

RECEIVING

,

HANDLING

AND

STORAGE

3.1

.

Receiving

.

.

3.2

.

Handling

3.3

.

Storage

.

.

..

4

.

INSTALLATION

4.1

.

Safety

Precautions

4.2

.

Interlocks

4.2

.

1

.

Rating

Interference

Plate

4.2

.

2

.

Closing

Spring

Discharge

Interlock

4.2

.

3

.

Negative

Interlock

Roller

4.2

.

4

.

Positive

Interlock

Bar

4.2

.

5

.

Closing

Spring

Gag

Interlock

.

..

.

1

1

1

2

2

2

2

2

2

2

3

3

3

3

3

3

5

.

OPERATION

5.1

,

Close

Spring

Charging

5.2

.

Closing

Operation

5.3

,

Opening

Operation

5.4

.

Trip

Free

Operation

6

.

CONTROL

CIRCUIT

7

.

MECHANICAL

CHECKING

AND

SLOW

CLOSING

7.1

.

Visual

Inspection

7.2

.

Closing

Spring

Charging

,

, , ,

7.3

.

Closing

Spring

Gag

7.4

.

Slow

ClosiiVg

7.5

.

Gag

Plate

Removal

8

.

DIMENSIONAL

CHECKS

8.1

.

Primary

Contact

Erosion

8.2

.

Spring

Wipe

8.3

.

Contact

Gap

.

8.4

.

Close

Coil

Plunger

Gap

8.5

.

Trip

Coil

Plunger

Gap

8.6

.

Control

Switch

Adjustment

3

4

»

*

4

4

5

5

5

i

*

5

5

5

5

5

6

6

6

6

6

6

6

>

7

Courtesy of NationalSwitchgear.com

9

.

ELECTRICAL

CHECKS

9.1

.

Electrical

Operation

9.2

.

High

-

Potential

Test

9.2

.

1

,

Primary

Circuit

9.2

.

2

.

Secondary

Circuit

9.3

.

Primary

Circuit

Resistance

.

.

..

.

.

9.4

.

Vacuum

Interrupter

Integrity

Test

9.5

.

Insulation

Tests

10

.

INTERLOCK

FUNCTIONAL

CHECK

11

.

MAINTENANCE

11.1

,

General

11.2

,

Service

Conditions

11.3

,

Fault

Interruptions

11.4

,

Contact

Erosion

11.5

,

Transfer

Finger

Wear

11.6

,

Mechanism

11.7

,

Primary

Insulation

Parts

11.8

,

Lubrication

11.9

,

Recommended

Maintenance

.

.

.

12

.

TIMING

13

.

OPENING

AND

CLOSING

SPEED

.

.

7

7

7

7

7

7

7

8

8

9

9

9

9

9

9

:

V

;

.

10

10

10

10

10

1 1

14

.

REPAIR

AND

REPLACEMENT

14.1

.

General

14.2

.

Replacement

of

Interrupter

Assemblies

14.3

.

Primary

Disconnect

Fingers

14.4

.

Mechanism

.

.

.

.

14.5

.

Control

Switches

11

1 1

1 1

12

12

.

.

A

12

<

4

44

4

4

•

I

4

4

4

4

<

4

4

•

4

44

«

4

4

4

4

»

44

4

44

4

»

44

»

4

4

»

4

*

4

4

4

»

44

4

4

4

»

44

4

>

4

4

44

4

«

4

*

14.6

.

Trip

Coil

Replacement

.

.

.

.

.

.

14.7

.

Closing

Coil

Replacement

..

.

,

14.8

.

Auxiliary

Switch

Replacement

14.9

.

Motor

Replacement

14

,

10

“

Y

”

12

.

vi

'

V

12

12

13

Rejay

Replacement

13

1

.

15

.

RENEWAL

PARTS

15.1

.

Ordering

Instructions

13

4

4

13

16

.

MECHANICAL

ADJUSTMENTS

16.1

.

General

16.2

.

Wipe

Adjustment

.

.

.

..

.

.

.

.

16.3

.

Contact

Gap

Adjustment

.

.

16.4

.

Trip

Coil

Plunger

16.5

.

Close

Coil

Plunger

16.6

.

Close

Latch

Stop

Bolt

.

.

.

.

.

16.7

.

Spring

Discharge

Interlock

.

16.8

.

Negative

Interlock

13

13

13

14

14

14

14

14

.

14

vv

Courtesy of NationalSwitchgear.com

LIST

OF

ILLUSTRATIONS

Page

No

.

FIGURE

1

RATING

INTERFERENCE

PLATE

FIGURE

2

FRONT

VIEW

OF

POWER

/

VAC

*

BREAKER

W

/

FRONT

COVER

.

FIGURE

3

FRONT

VIEW

OF

POWER

/

VAC

*

BREAKER

W

/

O

FRONT

COVER

FIGURE

4

MANUAL

CHARGING

.

FIGURE

5

MANUAL

CHARGING

FIGURE

6

TOGGLE

LINKAGE

POSITIONS

—

ML

-

18

MECHANISM

FIGURE

7

EROSION

INDICATOR

FIGURE

8

OPERATING

ROD

ASSEMBLY

FIGURE

9

SCHEMATIC

OF

ML

-

18

MECHANISM

FIGURE

10

TYPICAL

WIRING

DIAGRAM

FOR

ML

-

18

MECHANISM

FIGURE

11

POWER

/

VAC

*

BREAKER

LEFT

-

FRONT

VIEW

FIGURE

12

POWER

/

VAC

*

BREAKER

,

RIGHT

-

REAR

VIEW

FIGURE

13

TRIP

COIL

AND

LINKAGE

FIGURE

14

CLOSE

COIL

LINKAGE

FIGURE

15

BOTTOM

VIEW

OF

ML

-

18

MECHANISM

FIGURE

16

CONTACT

GAP

ADJUSTMENT

.

..

.

FIGURE

17

SPRING

DISCHARGE

INTERLOCK

FIGURE

18

SAMPLE

OPERATING

SPEED

GRAPHS

FIGURE

19

FLEX

CABLE

CONNECTION

FIGURE

20

NEGATIVE

INTERLOCK

FIGURE

C

CLOSE

COIL

PLUNGER

GAP

FIGURE

G

CONTACT

GAP

FIGURE

L

CLOSE

LATCH

STOP

FIGURE

S

CONTROL

SWITCHES

FIGURE

T

TRIP

COIL

PLUNGER

GAP

FIGURE

W

SPRING

WIPE

15

16

16

i

•

>

»

t

>

i

f

i

•

<

i

17

17

18

,

19

«

I

»

t

«

•

«

I

•

I

•

•

M

«

I

f

t

I

20

21

22

,

23

24

25

v

-

•

•

25

26

27

28

29

30

31

A

32

33

34

35

36

37

38

39

T

-

*

*

\

Courtesy of NationalSwitchgear.com

POWER

/

VAC

*

VACUUM

CIRCUIT

BREAKER

WITH

ML

-

I

8

MECHANISM

1

.

INTRODUCTION

1

1

,

1.2

.

SPECIFIC

DO

NOT

WORK

ON

AN

ENERGIZED

BREAKER

.

IF

WORK

HAS

TO

BE

PERFORMED

ON

THE

BREAKER

,

TAKE

IT

OUT

OF

SERVICE

AND

REMOVE

IT

FROM

THE

METALCLAD

EQUIPMENT

.

DO

NOT

WORK

ON

ANY

PART

OF

THE

BREAKER

WITH

THE

TEST

COUPLER

ENGAGED

,

All

spring

charged

mechanisms

related

to

a

breaker

must

.

be

serviced

only

by

skilled

and

knowledgeable

personnel

capable

of

releasing

each

spring

load

in

a

controlled

manner

.

PAR

-

TICULAR

CARE

MUST

BE

EXERCISED

TO

KEEP

PERSONNEL

CLEAR

OF

MECHANISMS

WHICH

ARE

TO

BE

OPERATED

OR

RELEASED

,

Information

on

construction

of

such

mechanisms

is

provided

in

this

in

-

struction

book

.

Operational

tests

and

checks

should

be

made

on

a

breaker

after

maintenance

,

before

it

is

returned

to

service

,

to

insure

that

it

is

capable

of

operating

properly

.

The

extent

of

such

tests

and

checks

should

be

consistent

with

the

level

of

maintenance

performed

,

If

maintenance

on

the

Power

/

Vac

*

breaker

is

being

performed

to

an

extended

schedule

such

as

a

5

-

year

or

10

-

year

program

the

vacuum

interrupter

integrity

test

should

be

performed

each

time

the

breaker

is

removed

from

the

metalclad

switchgear

for

reasons

other

than

scheduled

break

-

er

maintenance

if

it

has

been

more

than

one

year

since

the

last

vacuum

integrity

test

.

Interlocks

are

provided

for

the

safety

of

the

operator

and

correct

operation

of

the

breaker

,

If

an

interlock

does

not

function

as

described

DO

NOT

MODIFY

OR

DISFIGURE

THE

PARTS

.

DO

NOT

FORCE

THE

DEVICE

INTO

POSITION

.

CONTACT

THE

NEAREST

GE

APPARA

-

TUS

AND

ENGINEERING

SERVICE

OFFICE

FOR

INSTRUCTIONS

.

1.1

,

SAFETY

Each

user

has

the

responsibility

to

instruct

all

personnel

associated

with

this

equipment

on

all

safety

precautions

which

must

be

observed

.

\

*

7

-

•

•

The

following

are

recommendations

to

be

considered

in

a

user

’

s

safety

program

,

These

recommendations

are

not

in

-

tended

to

supplant

the

user

’

s

responsibility

for

devising

a

complete

safety

program

and

shall

not

be

considered

as

such

.

They

are

rather

suggestions

to

cover

the

more

important

aspects

of

personnel

safety

related

to

circuit

breakers

.

G

E

neither

condones

nor

assumes

any

responsibility

for

user

practices

which

deviate

from

these

recommendations

.

1.1

.

1

,

GENERAL

All

personnel

associated

with

installation

,

operation

and

maintenance

of

power

circuit

breakers

should

be

thoroughly

instructed

and

supervised

regarding

power

equipment

in

general

as

well

as

the

particular

model

of

equipment

with

which

they

are

working

.

Instruction

books

and

service

advices

should

be

closely

studied

and

followed

,

including

appropriate

sections

of

“

National

Electric

Safety

Code

"

ANSI

C

2

-

I

984

and

revisions

thereof

.

Maintenance

programs

must

be

well

planned

and

carried

out

consistent

with

both

customer

experience

and

man

-

ufacturer

’

s

recommendations

including

service

advices

and

instruction

books

.

Good

maintenance

is

essential

to

breaker

reliability

and

safety

.

-

•

•

Local

environment

and

breaker

application

must

be

con

-

sidered

in

such

programs

,

inclucp

-

jig

such

variables

as

ambient

temperatures

,

actual

continuou

^

current

,

number

of

opera

-

tions

,

type

of

interrupting

duty

,

and

any

unusual

local

condition

such

as

corrosive

atmosphere

or

major

insect

problems

.

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

problems

arise

which

are

not

covered

sufficiently

for

the

purchaser

’

s

purposes

,

the

matter

should

be

referred

to

the

G

E

Co

.

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

.

*

Registered

Trademark

of

GE

.

•

.

*

:

t

Courtesy of NationalSwitchgear.com

both

rear

wheels

in

both

directions

to

prevent

any

accider

movement

.

2

.

DESCRIPTION

The

Power

Vac

*

vacuum

circuit

breaker

is

a

horizontal

drawout

removable

and

interchangeable

interrupting

element

for

use

in

metalclad

switchgear

to

provide

protection

and

control

of

electrical

apparatus

and

power

systems

.

The

Power

Vac

*

Type

VB

1

circuit

breaker

with

ML

-

I

8

mechan

-

ism

is

available

in

continuous

current

ratings

of

1200

and

2000

amperes

in

accordance

with

industry

standards

.

A

combina

-

tion

1200

2000

ampere

breaker

is

also

available

.

Refer

to

the

breaker

nameplate

for

complete

rating

information

of

any

particular

breaker

,

The

nameplate

also

describes

the

control

power

requirements

for

that

breaker

.

The

application

of

a

breaker

must

be

such

that

its

voltage

,

current

and

interrupting

ratings

are

never

exceeded

.

Since

this

book

is

written

to

include

all

ratings

of

the

breaker

,

as

well

as

several

design

variations

,

the

instructions

will

be

of

a

general

character

and

all

illustrations

will

be

typical

unless

otherwise

specified

.

3.3

.

STORAGE

It

is

recommended

that

the

breaker

be

put

into

sen

immediately

in

its

permanent

location

.

If

this

is

not

possil

the

following

precautions

must

be

taken

to

assure

the

pro

)

storage

of

the

breaker

.

The

breaker

should

be

carefully

protected

against

ct

densation

,

preferably

by

storing

it

in

a

warm

,

dry

room

moderate

temperature

such

as

40

°

to

100

°

F

.

High

humid

may

have

an

adverse

effect

on

the

insulating

parts

and

shot

be

avoided

.

Circuit

breakers

for

outdoor

metalclad

switc

gear

should

be

stored

in

the

equipment

only

when

power

available

and

the

heaters

are

in

operation

to

prevent

cc

densation

.

The

breaker

should

be

stored

in

a

clean

location

,

free

fre

corrosive

gases

or

fumes

.

Particular

care

should

be

taken

protect

the

equipment

from

moisture

and

cement

dust

,

as

tl

combination

has

a

very

corrosive

effect

on

many

part

'

s

.

Rollers

,

latches

,

etc

.

of

the

operating

mechanism

should

1

coated

with

0282

A

2048

P

009

grease

to

prevent

rusting

.

3

.

RECEIVING

,

HANDLING

AND

STORAGE

3.1

.

RECEIVING

Each

breaker

is

carefully

inspected

before

shipment

.

Im

-

mediately

upon

receipt

of

the

circuit

breaker

,

an

examination

should

be

made

for

any

damage

sustained

in

transit

.

If

injury

or

rough

handling

is

evident

,

a

claim

should

be

filed

im

-

mediately

with

the

transportation

company

and

the

nearest

GE

Sales

Office

should

be

notified

,

It

is

expected

that

due

care

will

be

exercised

during

the

unpacking

and

installation

of

breakers

so

that

no

damage

will

occur

from

careless

or

rough

handling

,

or

from

exposure

to

moisture

or

dirt

.

Check

all

parts

against

the

packing

list

to

be

sure

that

no

parts

have

been

overlooked

.

...

If

the

breaker

is

stored

for

any

length

of

time

,

it

should

1

inspected

periodically

to

see

that

rusting

has

not

started

at

to

insure

good

mechanical

condition

,

Should

the

breaker

1

stored

under

unfavorable

atmospheric

conditions

,

it

shou

be

cleaned

and

dried

before

being

placed

in

service

;

v

,

’

\

v

.

-

'

-

4

.

INSTALLATION

4

,

1

.

SAFETY

PRECAUTIONS

This

circuit

breaker

uses

powerful

springs

for

energ

storage

.

DO

NOT

WORK

ON

THE

INTERRUPTERS

01

THE

MECHANISM

UNLESS

THE

CIRCUIT

BREAKE

!

IS

IN

THE

“

OPEN

”

POSITION

AND

BOTH

TH

CLOSING

AND

OPENING

SPRINGS

ARE

ElTliEI

DISCHARGED

OR

GAGGED

AND

ALL

ELEC

3.2

.

HANDLING

When

lifting

the

breake

^

use

of

the

specially

designed

lift

truck

is

recommended

.

It

is

-

necessary

to

use

the

truck

when

placing

a

breaker

into

or

removing

it

from

the

TWO

-

HIGH

metalclad

equipment

.

If

it

is

necessary

to

lift

the

breaker

with

a

hoist

,

use

four

1

/

2

inch

diameter

hooks

rated

at

least

500

pounds

each

,

Lifting

locations

are

provided

in

the

frame

side

members

12

,

Fig

.

1

)

,

Use

a

spreader

wider

than

the

breaker

to

prevent

the

slings

from

contacting

the

interrupter

supporting

insulating

material

parts

.

An

optional

accessory

lifting

sling

is

also

available

.

A

front

swivel

wheel

and

two

rear

wheels

are

provided

for

ease

of

movement

on

fiat

level

floors

.

When

unattended

breakers

are

left

on

a

floor

or

when

a

lift

truck

is

used

,

block

J

TRICAL

POWER

IS

REMOVED

.

These

precautions

ar

required

to

prevent

accidental

operation

.

Anyone

working

OJ

the

circuit

breaker

should

be

familiar

with

the

contents

of

thi

instruction

book

.

The

circuit

breaker

has

been

shipped

in

the

CLOSEE

position

.

After

removing

packing

material

,

open

the

breake

:

by

pushing

in

on

the

manual

trip

button

(

3

,

Fig

.

2

)

,

Whilt

keeping

hands

away

front

moving

parts

,

and

verify

that

the

operation

counter

advances

one

count

.

2

Courtesy of NationalSwitchgear.com

r

'

:

\

4

,

2.4

.

POSITIVE

INTERLOCK

BAR

This

interlock

will

prevent

the

racking

of

a

closed

breaker

into

or

out

of

a

metalclad

compartment

.

A

linkage

connected

to

the

cross

shaft

extends

a

detente

angle

(

3

,

Fig

.

II

)

out

through

the

left

side

of

the

mechanism

frame

when

the

breaker

contacts

are

in

the

closed

position

.

If

the

breaker

is

fft

;

the

“

CONNECT

”

or

“

DISCONNECT

/

TEST

”

position

in

the

metalclad

the

detente

angle

locks

into

the

racking

mechanism

to

prevent

access

to

the

hex

section

of

the

racking

screw

.

;

Closing

and

opening

springs

are

now

in

their

discharged

positions

.

Check

this

by

first

pressing

the

manual

close

button

,

then

the

manual

trip

button

.

The

indicator

flags

on

the

front

of

the

breaker

should

show

“

OPEN

"

and

“

DIS

-

CHARGED

"

.

All

mechanical

and

electrical

checks

should

be

completed

before

putting

breakers

in

service

.

4.2

.

INTERLOCKS

Each

Power

/

Vac

*

vacuum

circuit

breaker

is

provided

with

the

following

interlocks

.

i

4.2

.

5

,

CLOSING

SPRING

GAG

INTERLOCK

This

interlock

is

provided

to

prevent

a

breaker

that

has

a

gagged

closing

spring

from

entering

a

metalclad

unit

,

This

function

is

accomplished

by

projecting

an

angle

(

1

,

Fig

.

II

)

out

of

the

left

front

side

of

the

mechanism

when

the

closing

spring

is

gagged

,

This

angle

will

interfere

with

the

racking

mee

.

lj

anism

and

block

entry

into

the

metalclad

unit

when

the

Closing

Spring

Gag

Access

Door

is

open

.

4.2

,

1

.

RATING

INTERFERENCE

PLATE

This

interlock

(

l

.

Fig

.

l

)

permits

only

a

breaker

with

a

matching

continuous

current

,

voltage

and

interrupting

rating

to

be

inserted

into

a

metalclad

compartment

of

identical

rating

.

The

combination

1200

/

2000

ampere

breaker

can

be

used

in

either

a

1200

or

a

2000

ampere

compartment

,

The

rating

interference

plate

must

be

adjusted

to

match

the

current

rating

of

the

compartment

.

This

adjustment

is

done

by

positioning

the

outer

interference

plate

so

that

the

edge

of

the

plate

lines

up

with

the

current

indicated

on

the

label

attached

,

to

the

breaker

just

above

the

rating

interference

plate

.

*

•

••

:

*

,

•

5

.

OPERATION

The

Power

/

Vac

*

vacuum

circuit

breaker

uses

a

sealed

vacuum

power

interrupter

to

establish

and

interrupt

a

pri

-

mary

circuit

.

Primary

connections

to

the

associated

metalclad

\

’

4.2

.

2

,

CLOSING

SPRING

DISCHARGE

INTERLOCK

This

interlock

(

4

,

Fig

,

12

)

prevents

racking

into

or

out

of

the

metalclad

compartment

a

breaker

that

has

the

closing

spring

charged

.

This

action

is

accomplished

by

a

roller

on

the

right

side

of

the

breaker

mechanism

which

contacts

the

racking

mechanism

and

discharges

the

closing

spring

unless

the

breaker

is

in

the

“

DISCONNECT

/

TEST

”

position

or

the

“

CONNECT

”

position

in

the

metalclad

compartment

.

This

interlock

also

opens

the

CL

/

M

§

j

|

witch

in

the

motor

circuit

to

prevent

electrical

charging

of

the

closing

spring

when

the

breaker

is

between

the

"

DISCONNECT

/

TEST

"

and

the

“

CONNECT

"

position

in

the

metalclad

compartment

.

switchgear

are

made

by

horizontal

bars

and

disconnect

fingers

,

electrically

and

mechanically

connected

to

the

vac

-

uum

interrupters

.

Molded

supports

,

one

per

pole

oh

a

'

three

pole

breaker

,

provide

interchangeable

mountings

for

primary

bars

,

interrupters

,

current

transfer

fingers

,

and

heat

dissipation

fins

(

where

used

)

.

The

operating

mec

^

aAl

'

^

provides

vertical

motion

at

each

pole

location

in

order

to

JiH

-

move

the

lower

contact

of

the

vacuum

interrupters

front

ap

open

position

to

a

spring

-

loaded

closed

position

and

then

back

to

the

open

position

on

command

The

ML

-

18

mechanism

(

Fig

,

9

)

is

of

the

stored

-

energv

type

and

uses

a

gearmotor

to

charge

a

closing

spring

.

During

a

closing

operation

,

the

energy

stored

in

the

closing

spring

is

used

to

close

the

vacuum

interrupter

contacts

,

charge

the

wipe

springs

which

load

the

contacts

,

charge

the

opening

springs

,

and

overcome

bearing

and

other

frictional

forces

,

The

energy

then

stored

in

the

wipe

and

opening

springs

will

open

the

contacts

during

an

opening

operation

,

Closing

and

opening

operations

are

controlled

electrically

by

the

control

switch

on

the

metalclad

door

or

remote

relaying

.

Mechanical

control

is

provided

by

manual

close

and

4

,

2.3

.

NEGATIVE

INTERLOCK

ROLLER

The

function

of

this

interlock

(

5

,

Fig

,

II

)

is

to

remove

the

trip

latch

from

the

trip

roller

thereby

preventing

a

closing

operation

.

The

interlock

also

opens

the

LCS

switch

in

the

closing

circuit

thereby

removing

the

close

circuit

.

power

,

The

negative

trip

interlock

is

functional

while

the

breaker

is

being

moved

between

the

“

DISCONNECT

/

TEST

"

and

the

“

CON

-

NECT

"

position

in

the

metalclad

and

upon

withdrawal

from

the

metalclad

compartment

,

s

'

h

'

3

Courtesy of NationalSwitchgear.com

trip

buttons

on

the

circuit

breaker

.

The

closing

spring

may

be

manually

charged

,

and

a

method

for

slow

closing

the

primary

contacts

is

available

when

the

circuit

breaker

is

withdrawn

from

the

metalclad

cubicle

.

See

MECHANICAL

CHECK

-

ING

AND

SLOW

CLOSING

,

The

mechanism

will

operate

at

the

a

-

c

or

d

-

c

voltage

indicated

on

the

circuit

breaker

nameplate

.

Manual

pumping

of

the

handle

advances

the

ratchet

wheel

and

the

holding

pawl

prevents

counter

-

rotation

while

,

the

handle

is

returning

for

another

stroke

.

Six

to

eight

complete

strokes

of

the

manual

handle

are

required

for

one

complete

spring

-

charging

operation

.

When

the

spring

charge

indicatoj

(

9

,

Fig

.

3

)

shows

“

CHARGED

”

,

MANUAL

CHARGING

MUST

BE

DISCONTINUED

TO

AVOID

MECHANISM

DAMAGE

.

5.2

.

CLOSING

OPERATION

.

(

REFER

TO

FIG

.

9

)

By

either

energizing

the

close

solenoid

or

depressing

the

manual

close

button

,

the

close

latch

(

8

,

view

C

)

is

rotated

,

releasing

the

closing

spring

(

1

,

view

B

)

.

This

action

releases

the

'

energy

in

the

closing

spring

and

transmits

it

to

the

closing

cam

(

9

,

view

D

)

and

closing

roller

(

10

,

view

D

)

arid

causes

the

linkage

to

rise

until

the

prop

(

1

l

,

view

D

)

can

Slip

under

the

close

roller

(

10

,

view

D

)

and

hold

the

linkage

in

place

.

As

the

linkage

moves

,

the

output

crank

(

12

,

view

D

)

rotates

the

cross

shaft

(

13

,

view

D

)

which

in

turn

rotates

the

phase

bell

cranks

(

14

,

view

E

)

on

all

three

poles

.

The

rotation

of

the

phase

bell

cranks

compresses

the

two

opening

springs

(

15

,

view

E

)

on

poles

1

and

3

,

closes

the

vacuum

interrupters

and

compresses

the

wipe

springs

(

16

,

view

E

)

on

each

pole

.

The

rotation

of

the

cross

shaft

(

13

,

view

D

)

also

changes

the

auxilliary

switch

(

17

,

view

D

)

position

and

the

position

flag

on

the

front

panel

will

then

indicate

“

CLOSED

”

.

After

the

breaker

is

closed

,

the

charging

motor

is

again

energized

and

the

closing

spring

is

charged

as

described

under

“

CLOSE

SPRING

CHARG

-

ING

”

.

Spring

charging

is

possible

when

the

breaker

is

in

the

closed

position

because

the

linkage

is

held

in

place

by

the

prop

.

C

-

s

5.1

,

CLOSE

SPRING

CHARGING

Figure

9

shows

a

front

view

of

the

ML

-

18

in

a

schematic

form

.

The

primary

contacts

are

open

and

the

closing

springs

charged

.

The

closing

spring

charging

system

consists

of

a

closing

spring

(

l

.

view

B

)

mounted

on

the

left

side

of

the

breaker

and

the

electrical

charging

system

mounted

on

the

right

side

of

the

breaker

.

Both

components

are

fastened

to

the

cam

shaft

(

2

,

view

B

)

,

A

manual

charging

system

(

3

,

view

A

)

is

provided

so

that

the

mechanism

can

be

slow

closed

and

the

closing

spring

can

be

charged

if

there

is

a

loss

of

electrical

control

power

.

Spring

charging

is

accomplished

electrically

by

a

rotating

eccentric

on

the

output

shaft

of

the

gear

motor

driving

pivoted

charging

arms

(

4

,

view

C

)

that

oscillate

about

the

centerline

of

a

ratchet

wheel

(

5

,

view

C

)

.

A

driving

pawl

(

6

,

view

C

)

,

mounted

within

the

charging

arms

,

oscillates

with

the

charging

arms

.

Starting

from

its

rear

-

most

position

,

as

the

charging

arms

rotate

forward

,

a

spring

forces

engagement

of

the

driving

pawl

with

a

tooth

on

the

ratchet

wheel

.

The

ratchet

wheel

is

advanced

by

the

rotating

charging

arms

and

pawl

assembly

.

Advancement

of

one

tooth

spacing

is

provided

for

each

oscillation

of

the

system

,

The

ratchet

motion

is

restricted

to

one

direction

by

a

spring

-

loaded

holding

pawl

that

prevents

the

ratchet

wheel

from

going

backwards

as

the

charging

arms

oscillate

back

to

pick

up

the

next

tooth

.

Thirteen

complete

cycles

of

the

charging

arms

are

needed

for

a

full

charge

of

the

closing

spring

.

The

efficient

,

compact

gear

motor

accomplishes

this

action

in

just

about

two

seconds

.

When

the

charging

cycle

is

.

^

omplete

,

the

ratchet

wheel

is

positioned

so

that

a

missing

to

.

oth

is

adjacent

to

the

driving

pawl

and

any

motor

overspin

will

not

drive

the

ratchet

wheel

,

thus

preventing

damage

to

the

system

,

When

the

spring

is

completely

charged

,

the

assembly

is

retained

in

that

position

by

the

close

latch

,

until

it

is

desired

to

close

the

circuit

breaker

.

The

closing

coil

cannot

be

electrically

energized

unless

the

closing

spring

is

completely

charged

.

This

action

is

prevented

by

the

52

CHG

switch

in

the

closing

circuit

.

The

manual

charging

system

(

3

,

view

A

)

works

directly

on

the

cam

shaft

where

a

one

-

way

clutch

(

7

,

view

A

)

driven

by

a

manual

handle

provides

rotation

of

the

ratchet

wheel

.

i

5.3

.

OPENING

OPERATION

.

(

REFER

TO

FIG

.

9

)

By

either

energizing

the

trip

solenoid

(

18

,

view

.

B

)

or

depressing

the

manual

trip

button

(

23

,

view

B

)

,

the

trip

,

latch

(

19

,

view

D

)

is

rotated

,

permitting

the

linkage

to

collapse

and

the

vacuum

interrupter

contacts

to

open

under

the

force

of

the

wipe

springs

(

16

,

view

E

)

and

opening

springs

(

15

,

view

E

)

,

At

the

end

of

the

opening

stroke

the

center

phase

wipe

spring

assemble

hits

the

stop

on

the

frame

that

limits

overtravel

and

rebound

,

Rotation

of

the

cross

shaft

from

the

closed

to

the

open

position

operates

the

auxiliary

switch

(

17

,

view

D

)

which

opens

the

trip

coil

circuit

.

If

the

closing

spring

has

been

recharged

,

the

linkage

will

be

reset

and

the

trip

latch

will

be

in

place

on

the

trip

roller

ready

for

another

closing

operation

.

V

*

?

:

>

"

*

:

v

If

the

closing

spring

has

not

been

recharged

,

the

trip

latch

may

be

held

out

of

position

.

A

latch

-

checking

switch

(

21

.

,

view

C

)

will

not

close

unless

the

latch

is

in

its

normal

position

!

The

contacts

of

this

latch

-

checking

switch

are

in

the

closing

circuit

so

that

electrical

closing

is

blocked

when

the

trip

latch

not

reset

.

4

Courtesy of NationalSwitchgear.com

r

the

spring

load

is

held

by

the

closing

latch

,

the

spring

indicator

(

8

,

Fig

,

2

)

will

change

from

“

DISCHARGED

”

to

“

CHARGED

”

,

and

a

positive

snap

will

be

heard

as

the

spring

travels

over

center

,

After

the

spring

is

completely

charged

,

as

indicated

above

,

further

forcing

the

charging

handle

may

cause

damage

to

the

closing

latch

and

its

associated

parts

.

5.4

,

TRIP

-

FREE

OPERATION

.

(

REFER

TO

FIG

.

9

)

The

linkage

is

mechanically

trip

-

free

in

any

location

on

the

closing

stroke

.

Electrically

energizing

the

trip

coil

while

closing

will

,

after

the

auxiliary

switch

contacts

change

po

-

sition

,

rotate

the

trip

latch

and

permit

the

circuit

breaker

to

open

fully

.

The

linkage

will

reset

as

in

a

normal

open

operation

and

the

closing

spring

will

recharge

as

described

under

SPRING

CHARGING

.

7.3

.

CLOSING

SPRING

GAG

Insert

the

closing

spring

gag

plate

(

1

,

Fig

.

4

)

by

opening

the

closing

spring

gag

hole

cover

and

inserting

the

tip

of

the

,

gag

plate

between

the

end

of

the

spring

and

the

spring

guide

and

engaging

the

detentes

on

the

gag

plate

into

the

slots

In

‘

the

closing

spring

guide

.

Note

that

when

the

closing

spring

'

guide

is

exposed

for

gagging

,

an

interference

angle

is

exposed

on

the

left

side

of

the

breaker

(

I

,

Fig

.

II

)

.

With

the

closing

spring

in

the

gagged

position

,

this

angle

will

provide

interference

preventing

use

of

the

lift

truck

and

racking

of

the

breaker

element

.

No

attempt

should

be

made

to

alter

,

,

modify

-

or

othewise

make

inoperative

this

safety

feature

.

With

the

gag

plate

in

position

,

depress

the

manual

close

button

.

This

action

will

partially

discharge

the

closing

spring

and

also

partiaiiy

close

the

vacuum

interrupter

contacts

.

Do

not

energize

tjie

secondary

control

circuit

at

this

time

.

6

.

CONTROL

CIRCUIT

A

typical

POWER

/

VAC

circuit

breaker

ML

-

18

mechan

-

ism

wiring

diagram

is

shown

in

Fig

.

10

.

Check

the

wiring

diagram

supplied

with

the

actual

circuit

breaker

for

its

wiring

.

The

close

spring

charging

motor

circuit

is

established

through

the

CL

/

MS

switch

if

the

close

latch

is

reset

and

the

SM

/

LS

switch

if

the

closing

spring

is

discharged

,

When

the

closing

spring

is

charged

,

the

SM

/

LS

interrupts

the

circuit

.

The

close

coil

circuit

is

established

through

two

normally

closed

52

Y

relay

contacts

,

and

the

latch

checking

switch

LCS

,

if

the

trip

latch

is

reset

.

An

auxiliary

switch

contact

52

b

is

also

in

series

with

the

close

coil

and

closes

when

the

breaker

is

open

and

opens

when

the

breaker

is

closed

.

During

a

,

close

operation

,

cam

rotation

closes

the

SM

/

LS

contact

allowing

the

52

Y

relay

to

be

energized

opening

its

contacts

in

the

close

coil

circuit

and

sealing

itself

in

through

one

of

its

own

contacts

to

the

close

signal

.

This

seal

-

in

action

prevents

reclosing

on

a

sustained

close

command

as

the

close

signal

must

be

removed

to

drop

out

the

Y

relay

and

reestablish

the

closing

circuit

,

thereby

providing

an

anti

-

pump

feature

.

Circuit

breaker

mounted

auxiliary

switch

contacts

not

used

in

the

control

circuit

are

brought

out

for

control

and

indication

functions

.

The

metalclad

equipment

may

provide

a

breaker

-

operated

stationary

auxiliary

switch

for

addtional

contacts

.

S

'

'

\

7

,

4

.

SLOW

CLOSING

To

manually

slow

close

the

breaker

contacts

,

put

the

manual

charge

handle

on

the

manual

charge

lever

and

move

the

handle

up

and

down

.

The

breaker

will

be

fully

closed

when

the

spring

charge

indicator

shows

“

CHARGED

;

(

CA

UT

10

N

:

WITH

THE

GAG

PLATE

INSTALLED

.

THt

BREAKER

CLOSED

AND

OPENING

SPRINGS

CHARGED

,

THE

BREAKER

CAN

BE

TRIPPED

AT

FULL

SPEED

.

y

•

\

7.5

.

GAG

PLATE

REMOVAL

To

remove

the

gag

plate

,

the

closing

spring

must

be

ftillv

charged

.

If

the

spring

charge

indicator

does

not

show

“

CHARGED

"

in

the

window

,

manually

charge

the

spring

until

it

does

.

Lift

up

and

push

in

on

the

gag

plate

to

clear

the

detentes

on

the

gag

plate

from

the

slots

in

the

closing

spring

guide

.

While

holding

the

gag

plate

up

,

remove

it

from

the

opening

.

Close

the

gag

hole

cover

.

For

safety

,

first

close

the

breaker

by

depressing

the

manual

“

CLOSE

”

button

and

then

depress

the

manual

“

TRIP

"

button

.

All

stored

energy

is

'

tiSW

v

^

$

r

'

7

.

MECHANICAL

CHECKING

AND

SLOW

CLOSING

7

*

1

.

VISUAL

INSPECTION

Visually

inspect

the

circuit

breaker

for

any

signs

of

damage

or

loose

hardware

.

7.2

.

CLOSING

SPRING

CHARGING

Manually

charge

the

breaker

closing

spring

using

the

charging

handle

provided

(

l

,

Fig

,

5

)

,

The

closing

spring

is

charged

by

a

ratcheting

mechanism

that

advances

by

one

ratchet

tooth

at

a

time

.

When

the

spring

is

fully

charged

and

removed

from

the

breaker

.

5

Courtesy of NationalSwitchgear.com

8

.

DIMENSIONAL

CHECKS

With

the

breaker

closed

and

the

gag

plate

installed

,

perform

the

following

dimensional

checks

:

Measure

the

distance

between

the

two

lines

.

A

caliper

wi

give

an

accurate

reading

of

the

contact

gap

,

Dimension

0

The

gaps

must

be

between

the

0.600

inch

maximum

and

0

.

S

4

inch

minimum

.

It

is

not

necessary

that

all

readings

cOrres

pond

,

A

properly

adjusted

breaker

will

have

more

gap

an

wipe

on

the

center

pole

than

on

the

outside

poles

.

The

following

dimensional

checks

are

in

the

operatin

mechanism

which

is

accessible

from

the

bottom

.

To

accommc

date

these

checks

,

the

breaker

should

be

turned

on

its

rigb

side

resting

on

two

-

by

-

fours

.

DO

NOT

use

the

portabl

breaker

lift

truck

.

CAUTION

:

do

not

allow

anything

to

com

in

contact

with

the

interlock

roller

on

the

right

side

of

th

mechanism

.

T

;

V

(

8.1

.

PRIMARY

CONTACT

EROSION

With

the

closed

position

,

the

erosion

disk

(

5

,

Fig

,

7

)

below

the

operating

rod

insulator

is

aligned

with

a

reference

arm

(

4

,

Fig

.

7

)

on

new

interrupters

.

As

contact

erosion

occurs

,

the

erosion

disk

will

move

upward

from

alignment

with

that

reference

arm

.

This

is

dimension

E

in

Figure

7

,

Detail

A

,

When

erosion

reaches

1

/

8

inch

,

the

POWER

/

VAC

*

inter

-

rupter

^

should

be

replaced

.

Do

not

readjust

the

alignment

of

the

erosion

indicator

arm

except

when

installing

a

new

vacuum

interrupter

,

8.4

.

CLOSE

COIL

PLUNGER

GAP

The

close

coil

plunger

gap

is

shown

in

Figure

C

.

With

th

'

closing

spring

discharged

,

operate

the

plunger

to

imak

<

certain

that

the

plunger

moves

freely

over

its

full

stroke

itith

coil

.

To

check

the

closing

coil

plunger

gap

the

breaker

sjbtduh

be

open

and

the

closing

spring

charged

and

gagged

.

Dimen

sion

C

is

obtained

depressing

the

close

plunger

button

unti

resistance

is

felt

.

The

gap

between

the

plunger

button

and

th

<

coil

housing

should

be

between

0.250

and

0.300

of

an

inch

.

8.5

.

TRIP

COIL

PLUNGER

GAP

8.2

.

SPRING

WIPE

With

the

breaker

closed

and

the

closing

spring

gagged

,

measure

with

a

feeler

gauge

and

record

the

distance

between

the

top

of

the

wipe

indicator

and

the

bottom

of

the

erosion

disk

for

each

phase

(

see

Figure

W

,

Dimension

W

)

,

Trip

the

breaker

with

the

closing

spring

gag

plate

still

installed

and

measure

and

record

the

distance

between

the

wipe

indicator

and

erosion

disk

.

Subtract

the

closed

position

measurement

from

the

open

position

measurement

.

The

result

is

the

amount

of

wipe

on

each

individual

pole

.

The

wipe

,

dimension

W

,

is

to

be

greater

than

0.075

inch

.

Adjustment

is

not

required

until

wipe

is

0.075

inch

or

less

.

If

adjustment

is

required

see

WIPE

ADJUSTMENT

in

MECHANICAL

ADJUST

-

MENTS

section

.

The

ML

-

18

mechanism

is

furnished

with

very

low

gradient

wipe

springs

so

that

adjustment

is

not

a

precision

operation

and

considerable

loss

of

wipe

can

be

tolerated

without

affecting

performance

.

The

trip

coil

plunger

gap

is

shown

in

Figure

T

.

With

th

<

breaker

in

the

open

position

and

the

closing

spring

jn

tin

charged

position

,

make

certain

that

the

trip

linkage

and

trip

shaft

move

freely

over

the

full

plunger

travel

.

To

check

tin

trip

coil

plunger

gap

adjustment

,

the

breaker

is

to

be

closet

with

the

closing

spring

discharged

.

Dimension

T

between

the

plunger

button

and

the

coil

housing

should

be

between

6.20

C

and

0.250

inch

.

This

dimension

is

obtained

when

the

trip

plunger

button

is

depressed

until

resistance

is

felt

.

If

the

breaker

is

equipped

with

an

optional

second

trip

coil

;

us

<

same

procedure

.

8.6

.

CONTROL

SWITCH

ADJUSTMENT

•

‘

vV

:

:

;

'

V

'

;

L

7

8.3

.

CONTACT

GAP

The

method

of

measuring

the

contact

gap

is

as

follows

:

With

the

breaker

in

the

open

position

,

the

closing

springs

charged

and

the

closing

spring

gag

plate

installed

,

apply

a

piece

of

masking

tape

to

the

surface

of

the

operating

rod

insulator

as

shown

in

Figure

G

.

Using

a

reference

block

,

make

a

mark

on

the

tape

near

the

top

on

all

three

poles

.

It

is

also

advisable

to

put

a

reference

mark

on

the

tape

to

identify

to

which

pole

the

tape

is

applied

.

Remove

the

closing

spring

gag

plate

and

close

the

breaker

,

Using

the

same

procedure

as

above

,

re

-

mark

the

tape

.

This

new

mark

will

be

near

the

bottom

of

the

tape

.

Trip

the

breaker

,

remove

the

tapes

and

re

-

apply

them

to

a

flat

surface

.

The

breaker

is

to

be

in

the

open

position

with

the

opening

and

closing

springs

discharged

.

This

results

in

the

control

switch

plungers

being

in

the

depressed

position

.

The

switches

to

be

checked

.

are

shown

in

Figure

S

.

On

the

LCS

and

stacked

switches

(

SM

/

LS

&

CHG

)

,

the

plunger

rod

is

to

be

recessed

within

the

rear

of

the

switch

body

and

this

recess

is

to

be

6

to

1

/

32

inch

.

This

is

a

visual

check

.

The

CL

/

MS

switch

with

wiring

terminals

on

the

side

is

to

be

adjusted

as

described

above

.

For

the

CL

/

MS

switch

with

wiring

terminals

on

the

rear

the

plunger

is

set

to

a

dimension

of

0.990

to

1.010

”

from

its

mounting

bracket

.

The

breaker

can

now

be

placed

,

in

its

normal

upright

position

.

•

*

V

*

6

Courtesy of NationalSwitchgear.com