ABB 15VHK500 User manual

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3

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IB

6.2

.

7.7

-

1

D

Installation

/

Maintenance

Instructions

Medium

-

Voltage

Vacuum

Power

Circuit

Breakers

Type

15

VHK

500

/

750

1200

/

2000

Amperes

15000

Volts

ikllll

MIPIP

ABB

Power

Distribution

,

Inc

.

Circuit

Breaker

Division

ASEA

BROWN

BOVERI

Courtesy of NationalSwitchgear.com

>

AM

ASEA

BROWN

BOVERI

n

TABLE

OF

CONTENTS

PAGE

INTRODUCTION

AND

RATINGS

RECEIVING

AND

STORAGE

CIRCUIT

BREAKER

INSTALLATION

General

Installation

Inspection

Removing

Front

Cover

and

Interphase

Barrier

..

Interphase

Barrier

Examination

Vacuum

Interrupter

Examination

Insulation

Structure

Installing

Front

Cover

and

Interphase

Barrier

..

.

Installing

Circuit

Breaker

into

Compartment

.

.

..

CIRCUIT

BREAKER

REMOVAL

MAINTENANCE

General

Information

Millivolt

Drop

Test

Insulation

Cleaning

CIRCUIT

BREAKER

OPERATION

AND

CONTACTS

Closing

and

Opening

Times

and

Speeds

Operating

Mechanism

Racking

Mechanism

Control

Relay

Adjustment

LUBRICATION

DIELECTRIC

TESTS

ELECTRICAL

CHARACTERISTICS

ELECTRICAL

OPERATING

SEQUENCE

RENEWAL

PARTS

TYPICAL

CONTROL

CIRCUIT

3

3

3

3

.

3

3

3

3

5

5

5

5

6

6

6

7

.

7

.

9

.

9

.

9

9

10

10

10

10

11

12

These

instructions

do

not

purport

to

cover

all

details

or

variations

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

nearest

District

Office

.

Courtesy of NationalSwitchgear.com

AM

IB

6.2

.

7.7

.

-

1

Page

3

ASEA

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BOVERI

INTRODUCTION

These

instructions

for

installation

,

operation

and

mainte

-

nance

of

15

VHK

vacuum

circuit

breakers

should

be

read

carefully

and

used

as

a

guide

during

installation

and

initial

operation

.

The

specific

ratings

of

each

model

circuit

breaker

are

listed

on

the

individual

nameplates

.

File

these

instructions

in

a

readily

accessible

place

to

-

gether

with

drawings

and

descriptive

data

of

the

switch

-

gear

.

These

instructions

will

be

a

guide

to

proper

mainte

-

nance

of

the

equipment

and

prolong

its

life

and

usefulness

.

The

circuit

breaker

is

shipped

with

contacts

closed

,

closing

springs

discharged

and

opening

springs

charged

.

If

the

circuit

breaker

is

furnished

with

an

undervoltage

device

,

the

device

will

be

lockwired

to

allow

closing

of

the

breaker

for

shipment

.

A

tag

will

identify

the

lock

wire

.

To

remove

the

wire

,

open

the

breaker

and

reach

behind

the

control

panel

f

rom

the

right

hand

side

.

Using

wire

cutters

,

cut

and

remove

the

tagged

wire

.

WARNING

WARNING

WARNING

WARNING

Priortoanydisassemblyorinspectionofthe

circuit

breaker

,

the

closing

springs

should

be

discharged

,

and

the

breaker

should

be

open

.

Referring

to

Fig

.

1

,

if

it

is

necessary

to

raise

or

move

the

breaker

,

attach

a

lifting

yoke

(

5

)

at

points

4

on

both

sides

of

the

truck

,

or

a

fifth

wheel

at

point

6

to

transport

the

breaker

as

required

.

RECEIVING

AND

STORAGE

Immediately

upon

receipt

of

the

circuit

breakers

,

examine

the

cartons

to

determine

if

any

damage

or

loss

was

sus

-

tained

during

transit

.

If

injury

or

rough

handling

is

evident

,

file

a

damage

claim

at

once

with

the

carrier

and

promptly

notify

the

nearest

District

Office

.

The

company

is

not

responsible

for

damage

of

goods

after

delivery

to

the

carrier

,

however

,

we

will

lend

assistance

if

notified

of

claims

.

Unpack

the

circuit

breakers

as

soon

as

possible

after

receipt

.

If

unpacking

is

delayed

,

difficulty

may

be

experi

-

enced

in

making

a

claim

for

damages

not

evident

upon

receipt

.

Use

care

in

unpacking

in

order

to

avoid

damaging

any

of

the

circuit

breaker

parts

.

Check

the

contents

of

each

carton

against

the

packing

list

before

discarding

any

pack

-

ing

material

.

If

any

shortage

of

material

is

discovered

,

promptly

notify

the

nearest

District

Office

.

Information

specifying

the

purchase

order

number

and

part

numbers

of

the

damaged

or

missing

parts

should

accompany

the

claim

.

Circuit

breakers

should

be

installed

in

their

permanent

location

as

soon

as

possible

.

If

the

breakers

are

not

to

be

placed

in

service

for

some

time

,

it

is

advisable

to

provide

adequate

means

of

protection

.

This

may

be

done

by

keeping

the

breaker

in

its

original

shipping

carton

and

storing

in

a

warm

,

dry

and

uncontaminated

atmosphere

.

If

the

circuit

breaker

cannot

be

stored

properly

due

to

circum

-

stances

,

it

must

be

thoroughly

checked

before

going

into

service

to

insure

it

has

not

absorbed

moisture

,

rusted

or

become

generally

contaminated

in

any

way

.

Installation

Inspection

Inspect

condition

of

circuit

breaker

vacuum

interrupters

and

electrical

connections

prior

to

installing

the

circuit

breaker

into

the

switchboard

.

Even

though

each

circuit

breaker

is

completely

adjusted

and

tested

at

the

factory

,

shipping

and

handling

conditions

could

cause

defects

.

The

front

cover

and

interphase

barrier

assemble

(

2

,

Fig

.

1

)

must

be

removed

for

access

to

and

inspection

of

the

vacuum

inter

-

rupters

,

and

their

associated

adjustments

.

Removing

Front

Cover

and

Interphase

Barrier

(

See

Fig

.

1

)

The

assembly

can

be

removed

after

first

removing

four

(

4

)

lower

,

front

cover

screws

(

1

)

and

one

screw

(

7

)

on

each

side

,

inside

the

front

cover

.

Interphase

Barrier

Examination

All

barrier

hardware

should

be

securely

tightened

.

There

should

be

no

through

holes

or

apparent

missing

hardware

on

the

barrier

assembly

.

Also

,

dust

or

dirt

should

be

removed

by

wiping

with

a

clean

lintless

cloth

saturated

with

an

oil

-

free

solvent

.

Vacuum

Interrupter

Examination

(

See

Fig

.

2

)

CIRCUIT

BREAKER

INSTALLATION

CAUTION

CAUTION

CAUTION

CAUTION

General

Prior

to

initial

installation

of

the

circuit

breaker

into

the

switchboard

,

certain

preliminary

inspections

should

be

made

to

insure

proper

operation

.

The

inspection

proce

-

dures

for

this

are

given

in

this

section

.

Afterthe

interphase

barrierhas

been

removed

,

agrounding

stick

should

be

used

to

discharge

the

mid

-

band

ring

,

on

the

vacuum

interrupters

(

1

)

so

equipped

,

before

any

work

is

done

on

the

interrupters

.

Courtesy of NationalSwitchgear.com

IB

6.2

.

7.7

.

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1

Page

4

ASEA

BROWN

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Fig

.

2

*

Circuit

Breaker

with

Front

Cover

&

Interphase

Barrier

Assembly

Removed

Fig

1

-

Circuit

Breaker

Assembly

with

Lifting

Yoke

Installed

.

)

Fig

.

3

-

Front

Circuit

Breaker

Panel

&

Accessories

Courtesy of NationalSwitchgear.com

ABB

IB

6.2

.

7.7

.

-

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Page

5

ASEA

BROWN

BOVERI

Installing

Circuit

Breaker

into

Compartment

(

See

Figs

.

3

&

4

)

NOTE

:

CLOCKWISE

ROTATION

of

racking

crank

for

inserting

breaker

.

COUNTERCLOCKWISE

rotation

of

racking

crank

for

removal

of

breaker

.

Turn

motor

disconnect

switch

(

1

,

Fig

.

3

)

to

“

OFF

"

position

.

Engage

racking

crank

(

4

,

Fig

.

4

)

and

push

racking

unlock

-

ing

lever

(

3

)

to

left

,

then

rotate

racking

crank

counterclock

-

wise

only

until

resistance

to

motion

is

felt

(

DO

NOT

FORCE

)

.

If

closing

springs

were

left

in

the

“

charged

”

condition

,

they

will

automatically

discharge

.

For

installing

the circuit

breaker

into

the

lower

compart

-

ment

,

the

fifth

wheel

is

used

to

position

the

breaker

so

that

it

is

lined

up

with

the

switchgear

.

Engage

the

fifth

wheel

(

12

,

Fig

.

3

)

with

hole

(

5

,

Fig

.

3

)

.

The

lift

device

is

required

to

lift

and

position

the

breaker

for

installation

into

the

upper

compartment

.

Guide

and

push

circuit

breaker

into

compart

-

ment

until

stopped

.

Again

engage

racking

crank

and

rotate

clockwise

until

racking

mechanism

automatically

stops

at

“

DISCONNECT

’

position

.

(

Breaker

is

now

held

captive

in

compartment

.

)

To

rack

circuit

breaker

to

‘

TEST

”

position

,

push

racking

unlocking

lever

(

3

,

Fig

.

4

)

to

left

,

rotate

racking

crank

approximately

1

/

4

turn

clockwise

,

then

release

unlocking

lever

.

Continue

cranking

until

racking

mechanism

auto

-

matically

stops

at

'

TEST

”

position

.

With

thecircuit

breaker

racked

to

TEST

”

position

,

it

should

be

checked

for

proper

operation

by

operating

all

possible

means

of

opening

and

closing

,

this

includes

control

switches

,

relays

,

etc

.

Turn

motordisconnect

switch

(

1

,

Fig

.

3

)

to

“

ON

”

position

to

charge

the

closing

springs

,

and

operate

the

breaker

as

required

.

The

insulated

vacuum

envelope

(

2

)

should

be

examined

carefully

for

cracks

in

the

area

of

the

metal

-

to

-

insulation

seals

on

both

ends

and

around

the

mid

-

band

ring

.

Since

a

certain

amount

of

transmitted

light

is

usually

required

to

detect

cracks

,

the

inspection

should

be

done

in

a

well

lighted

area

.

If

the

mid

-

band

ring

,

when

so

equipped

,

has

been

bent

by

an

accidental

impact

,

that

area

should

be

specially

scruntinized

for

seal

damage

.

Small

external

chips

,

however

,

will

not

impair

the

useful

life

of

the

inter

-

rupter

.

To

prevent

loss

of

vacuum

care

should

be

exercised

so

as

notto

damage

the

interrupter

’

s

plastic

cover

vacuum

Pinch

-

off

tube

(

3

)

.

Insulation

Structure

All

insulated

parts

should

be

checked

for

damage

.

Any

dust

or

dirt

should

be

removed

by

air

or

wiped

with

a

clean

lintless

cloth

saturated

with

an

oil

-

free

solvent

.

This

is

important

because

dirt

and

dust

can

accumulate

and

,

with

moisture

,

can

place

the

circuit

breaker

in

jeopardy

,

dielec

-

trically

.

The

lead

support

moldings

are

basically

polyester

glass

and

occasionally

have

some

resin

rich

cracks

or

crazing

develop

but

these

do

not

indicate

defective

material

and

should

not

cause

concern

.

Installing

Front

Cover

and

Interphase

Barrier

(

See

Fig

.

D

Install

the

assemble

and

fasten

with

four

lower

front

cover

screws

(

1

)

and

one

screw

(

7

)

on

each

side

,

inside

the

front

cover

.

NOTE

:

It

is

recommended

thatadielectricwithstandtest

be

made

prior

to

initially

putting

this

or

any

type

vacuum

circuit

breaker

into

service

.

Refer

to

Dielectric

Tests

,

in

the

Main

-

tenance

,

Adjustments

and

Tests

section

of

this

bulletin

,

for

the

correct

test

procedure

.

WARNIG

WARNING

WARNING

WARNING

When

racking

circuit

breaker

to

“

CONNECTED

”

position

,

close

compartment

door

(

1

,

Fig

.

4

)

and

insert

racking

crank

(

4

,

Fi

3

4

.

)

through

sliding

panel

(

2

,

Fig

.

4

)

.

Push

unlocking

lever

(

3

)

to

left

and

turn

racking

crank

(

4

)

approximately

1

/

4

turn

clockwise

,

then

release

unlocking

lever

.

Continue

cranking

until

racking

mechanism

auto

-

matically

stops

at

“

CONNECTED

”

position

.

CAUTION

CAUTION CAUTION

CAUTION

Do

not

attempt

to

rack

any

further

.

The

circuit

breaker

may

now

be

put

in

service

and

be

operated

as

required

.

CIRCUIT

BREAKER

REMOVAL

(

See

Fig

.

4

)

To

remove

circuit

breaker

from

“

CONNECTED

”

position

Fig

.

4

—

Method

of

Racking

Circuit

Breaker

Courtesy of NationalSwitchgear.com

AM

IB

6.2

.

7.7

.

-

1

Page

6

ASEA

BROWN

BOVERI

open

the

breaker

as

required

.

Open

sliding

door

(

2

)

in

front

compartment

door

(

1

)

.

En

-

gage

racking

crank

(

4

)

and

push

racking

unlocking

lever

(

3

)

to

left

.

Rotate

racking

crank

(

4

)

counterclockwise

approxi

-

mately

1

/

4

turn

,

then

release

unlocking

lever

.

Continue

cranking

counterclockwise

until

racking

mechanism

auto

-

matically

stops

at

“

TEST

'

position

.

and

it

is

not

expected

that

the

interrupters

will

have

to

be

replaced

due

to

excessive

erosion

of

contacts

.

There

is

,

however

,

a

checkforcontact

wipe

(

contact

pressure

)

which

is

also

a

measure

ol

contact

erosion

.

This

check

is

covered

under

‘

Circuit

Breaker

Operation

and

Contacts

”

.

When

contact

wipe

is

less

than

the

minimum

specified

and

it

has

been

determined

that

the

breaker

closes

fully

and

there

is

not

a

mechanical

problem

,

then

the

interrupter

should

be

replaced

due

to

contact

erosion

.

If

,

however

after

the

first

inspection

period

there

is

no

indication

of

any

problems

,

actual

operating

experience

with

specific

circuits

will

indicate

the

future

amount

of

maintenance

needed

for

the

various

circuit

breakers

and

the

procedure

can

be

modified

as

required

.

Ol

course

,

where

unusual

service

conditions

exist

,

as

covered

by

ANSI

Standard

C

37.04

,

it

must

be

presumed

that

these

conditions

were

considered

at

the

time

of

order

;

that

the

equipment

supplied

was

designed

for

the

special

application

;

and

that

an

appropriate

supplemental

mainte

-

nance

program

has

been

developed

.

These

maintenance

instructions

only

cover

circuit

breakers

used

under

the

standard

service

conditions

.

At

the

selected

maintenance

period

,

the

following

tests

and

adjustments

should

be

made

;

NOTE

:

The

following

tabulated

tests

and

adjustments

are

those

that

are

normally

necessary

for

proper

maintenance

and

operation

of

the

15

VHK

circuit

breaker

.

The

remaining

portions

of

the

breaker

—

close

coil

assembly

,

shunt

trip

device

,

control

relay

,

auxiliary

switch

and

motor

require

no

maintenance

during

the

standard

life

of

the

circuit

breaker

regardless

of

the

operating

duty

.

Repeat

same

operation

for

“

DISCONNECT

'

position

.

The

circuit

breaker

can

now

be

positioned

for

withdrawal

.

If

in

the

upper

compartment

the

lift

device

must

first

be

located

in

the

correct

position

.

For

withdrawal

from

the

switchboard

,

again

push

the

racking

unlocking

lever

to

the

left

and

turn

the

racking

crank

counterclockwise

only

until

resistance

to

motion

is

felt

.

(

Approximately

2

-

3

turns

—

DO

NOT

FORCE

.

)

The

closing

springs

,

if

charged

,

will

auto

-

matically

discharge

when

the

circuit

breaker

is

moved

to

the

withdrawn

position

.

The

circuit

breaker

can

now

be

re

-

moved

from

the

compartment

by

pulling

on

the

handle

located

on

the

front

barrier

.

MAINTENANCE

,

ADJUSTMENTS

AND

TESTS

General

Information

j

The

15

VHK

circuit

breakers

are

designed

for

minimum

maintenance

and

tested

to

insure

that

minimum

mainte

-

nance

will

be

required

.

The

few

adjustments

that

are

noted

are

required

only

when

an

operational

check

indicates

a

problem

.

Of

course

,

during

the

maintenance

checks

,

all

accessible

bolts

,

nuts

and

screws

should

be

routinely

checked

to

insure

that

they

are

tight

,

it

is

recommended

that

the

circuit

breaker

be

normally

inspected

after

the

first

2000

operations

,

regardless

of

the

type

of

duty

it

is

used

for

.

These

operations

can

be

either

no

-

load

mechanical

,

load

current

switching

,

bulk

capacitor

or

reactor

switching

operations

,

or

for

motor

starting

appli

-

cations

.

Vacuum

interrupters

,

as

used

on

the

15

VHK

circuit

break

-

ers

,

have

an

inherently

long

contact

life

and

will

provide

troublefree

service

under

varied

application

conditions

,

as

long

as

the

circuit

breaker

is

applied

within

its

rating

.

The

wear

condition

of

the

individual

vacuum

interrupters

will

vary

,

depending

on

circu

it

conditions

and

such

variables

as

single

phase

versus

three

-

phase

interruption

,

X

/

R

ratio

(

asymmetry

)

and

relay

delay

times

.

Of

course

,

interrupting

high

short

-

circuit

current

will

cause

contact

erosion

to

occur

faster

than

load

current

interruptions

.

The

interrupters

for

the

15

VHK

Circuit

Breakers

are

designed

and

tested

for

2000

%

KSI

minimum

.

It

is

unlikely

that

a

circuit

breaker

will

be

subjected

to

this

much

duty

during

the

life

of

the

breaker

D

.

C

.

Millivolt

Drop

Test

During

maintenance

periods

,

the

condition

of

the

breaker

current

circuit

can

easily

be

determined

by

performing

a

millivolt

drop

test

.

This

test

should

be

performed

regardless

of

whether

the

circuit

breaker

had

interrupted

low

or

high

currents

or

has

minimum

operations

.

The

following

table

lists

the

millivolt

drop

and

resistance

values

tor

the

circuit

breakers

covered

by

this

instruction

book

,

from

terminal

to

terminal

,

exclusive

of

the

primary

disconnects

.

Maximum

Maximum

MV

Drop

*

Micro

-

Ohms

Curcuit

Breaker

15

VHK

500

/

750

1

200

Ampere

7

35

;

15

VHK

500

/

750

2000

Ampere

6

30

‘

Millivolt

drop

with

200

amperes

DC

flowing

.

Courtesy of NationalSwitchgear.com

AM

IB

6.2

.

7.7

.

-

1

Page

7

ASEA

BROWN

BOVERI

d

.

The

measurement

with

the

breaker

open

should

be

at

least

.

020

"

greater

than

when

the

breaker

is

closed

.

e

.

When

contact

wipe

is

less

than

the

.

020

and

it

has

been

determined

that

the

breaker

closes

fully

and

there

is

not

a

mechanical

problem

,

then

the

interrupter

should

be

replaced

due

to

contact

erosion

.

4

.

Contact

Air

Gap

(

See

Fig

.

5

)

The

contact

air

gap

is

set

at

the

factory

at

the

nominal

dimension

of

.

43

.

This

value

will

normally

increase

as

the

contacts

erode

.

A

check

of

the

contact

air

gap

checks

that

the

breaker

does

open

fully

and

that

the

gap

is

sufficient

to

withstand

the

applied

voltage

.

The

measurement

is

made

as

follows

for

the

three

poles

.

a

.

Open

the

breaker

and

discharge

the

closing

springs

.

b

.

Measure

and

record

dim

.

Y

2

.

c

.

Close

the

breaker

,

measure

and

record

dim

.

Y

.

d

.

The

air

gap

is

the

difference

between

the

two

meas

-

urements

.

The

acceptable

limits

are

.

40

—

.

54

,

with

the

upper

limit

being

approached

as

contact

wipe

approaches

the

minimum

.

On

circuit

breakers

with

normal

or

less

than

normal

load

-

ings

,

the

listed

values

may

be

exceeded

up

to

150

%

.

For

optimum

performance

of

the

circuit

breakers

during

periods

of

increased

loading

,

it

is

recommended

that

the

listed

values

not

be

exceeded

.

Insulation

Cleaning

Any

dirt

,

dust

or

grease

should

be

removed

from

the

surfaces

of

the

entire

current

carrying

structure

,

vacuum

interrupter

,

base

insulation

sheet

and

interphase

barrier

assembly

.

Wiping

the

surface

with

an

oil

-

free

solvent

on

a

clean

cloth

or

industrial

wiper

is

normally

sufficient

for

this

purpose

.

‘

Remember

to

discharge

mid

-

band

ring

on

interrupters

so

equipped

.

CIRCUIT

BREAKER

OPERATION

AND

CONTACTS

1

.

To

check

breaker

operation

,

the

breaker

should

be

withdrawn

from

the

switchboard

,

the

front

cover

and

barrier

removed

and

the

racking

screw

turned

two

to

three

turns

clockwise

until

the

racking

unlocking

lever

snaps

into

the

first

position

corresponding

to

the

disconnect

position

.

2

.

Fully

closed

breaker

(

See

Fig

.

3

)

.

Charge

the

closing

springs

and

turn

the

motor

switch

(

1

)

off

.

Close

the

breaker

.

Engage

manual

charge

handle

(

3

)

with

charging

lever

(

3

)

.

During

the

initial

portion

of

the

downward

stroke

of

the

handle

check

to

see

which

direction

the

closing

spring

guides

(

2

)

move

.

If

the

spring

guides

start

to

move

out

then

the

breaker

did

fully

close

.

If

the

spring

guide

begins

to

move

in

and

with

additional

pumping

moves

in

until

the

mechanism

can

be

heard

to

“

snap

in

”

,

then

the

breaker

did

not

fully

close

originally

.

Excess

contact

pressure

orfriction

can

cause

this

condition

and

if

it

cannot

be

relieved

then

the

factory

should

be

consulted

.

3

.

Contact

wipe

(

contact

pressure

)

(

See

Fig

.

5

)

.

The

contact

air

gap

and

contact

wipe

is

set

at

the

factory

by

setting

the

vertical

position

of

the

interrupter

(

1

)

and

the

vertical

position

of

the

pushrod

(

2

)

.

These

parts

should

not

be

repositioned

in

the

field

unless

a

pushrod

change

is

required

to

correct

contact

sequence

as

described

else

-

where

.

Contact

wipe

is

set

at

the

factor

at

.

11

minimum

.

Contact

erosion

and

wear

in

mechanical

parts

will

cause

a

reduction

in

contact

wipe

over

the

life

of

the

breaker

and

a

check

should

be

made

to

insure

that

the

wipe

is

not

less

than

.

020

"

.

The

measurement

is

made

as

follows

for

the

three

poles

:

a

.

Open

the

breaker

and

discharge

the

closing

springs

.

b

.

Using

a

thin

6

"

scale

measure

from

the

spring

base

to

pivot

pin

3

.

Record

dimension

X

2

.

c

.

Close

the

breaker

and

again

measure

between

the

spring

base

and

pivot

pin

3

.

Record

Dim

.

X

.

5

.

Contact

sequence

(

See

Fig

.

5

)

.

All

three

poles

should

touch

within

2

millisecond

at

normal

closing

speeds

.

An

oscilloscope

,

oscillograph

or

other

timing

method

may

be

used

to

establish

the

2

millisecond

timing

.

Before

checking

contact

sequence

,

check

that

the

contact

wipe

and

air

gaps

are

correct

.

It

is

not

expected

that

the

contact

sequence

should

exceed

the

2

millisecond

limit

;

therefore

,

before

attempting

to

readjust

,

check

that

the

test

equipment

and

procedure

are

correct

.

Also

consider

,

espe

-

cially

when

testing

with

electronic

equipment

,

that

.

002

seconds

vacuum

interrupter

contact

bounce

is

permissible

during

normal

closing

and

this

bounce

can

influence

the

contact

touch

measurements

.

If

it

is

determined

that

the

contact

sequence

is

not

within

the

2

milliseconds

,

then

adjustment

is

required

.

Usually

,

read

-

justment

of

one

pole

should

be

sufficient

so

that

all

three

poles

touch

within

2

milliseconds

.

The

air

gap

of

the

pole

to

be

changed

should

be

decreased

if

the

contacts

of

that

pole

are

touching

afler

the

other

two

poles

,

or

increased

if

the

contacts

are

touching

before

fhe

other

two

poles

.

The

air

gap

is

decreased

by

turning

pushrod

(

2

)

clockwise

,

viewing

from

the

top

of

the

breaker

,

and

increased

by

turning

counterclockwise

.

Before

the

pushrod

can

be

turned

,

the

breaker

must

be

open

,

closing

springs

discharged

and

pin

(

3

)

removed

.

With

the

breaker

open

,

the

vacuum

in

the

interrupter

maintains

a

constant

upward

force

of

approx

.

25

lbs

.

on

the

moving

contact

and

pushrod

(

2

)

.

Therefore

,

before

remov

-

ing

pin

(

3

)

,

the

contact

must

be

held

down

in

the

open

position

by

temporary

spacers

at

location

(

z

)

.

After

remov

-

ing

retaining

ring

(

4

)

and

pin

(

3

)

,

rotate

pushrod

(

2

)

as

Courtesy of NationalSwitchgear.com

ABB

IB

6.2

.

7.7

.

-

1

Page

8

ASEA

BROWN

BOVERI

0

—

r

a

4

*

Vfim

'

S

-

'

r

,

J

earner

i

%

l

*

T

J

m

*

OPENING

THOUGH

.

j

iw

.

R

K

HOUSING

4

PTU

0

C

41

2

Fig

.

6

—

Latch

Check

Switch

Adjustment

RACKING

LEAD

SCREW

%

AOi

'

I

rp

T

(

o

t

\

o

RACKING

RCLEASC

CEVTR

D

.

@

5

.

\

;

y

PADLOCK

LOCKOUT

PLATE

2

Fig

.

7

—

Racking

Mechanism

Courtesy of NationalSwitchgear.com

ABB

IB

6.2

.

7.7

.

-

1

Page

9

A

3

EA

BROWN

BOWER

!

with

bell

ringer

)

.

Retract

adjusting

screw

until

switch

con

-

tacts

“

make

”

,

then

rotate

adjusting

screw

one

turn

more

.

(

Adjusting

screw

is

self

-

locking

.

)

required

.

1

/

4

turn

of

the

pushrod

(

2

)

will

change

the

air

gap

by

approx

.

.

019

.

After

rotating

the

pushrod

,

carefully

reposition

the

moving

contact

and

pushrod

vertically

to

align

the

pin

holes

.

Replace

the

pin

and

retainer

and

remove

the

temporary

spacer

.

During

the

readjustment

procedure

note

that

the

contact

wipe

and

air

gap

dimensions

,

specified

previously

,

must

be

maintained

.

Also

,

that

no

more

than

1

/

2

turn

total

of

the

pushrod

should

be

required

when

readjusting

for

contact

sequence

.

After

completing

the

contact

sequence

procedure

,

recheck

the

contact

wipe

and

air

gaps

.

The

front

cover

and

interphase

barrier

assembly

can

now

be

reinstalled

-

Return

the

racking

screw

to

its

original

position

by

turning

it

counterclockwise

approx

,

two

to

three

turns

until

it

stops

.

Racking

Mechanism

(

See

Fig

.

7

)

The

circuit

breaker

racking

mechanism

is

adjusted

for

proper

operation

and

should

not

be

disturbed

unless

it

becomes

possible

to

close

the

breaker

during

a

racking

operation

.

It

may

be

possible

that

interlocked

blocking

members

are

not

positioned

properly

,

which

should

be

corrected

as

follows

:

Remove

the

lowerfront

mechanism

coverplate

and

with

the

circuit

breaker

closed

,

make

adjustments

by

regulating

the

length

of

connecting

rod

(

1

)

for

1

/

32

inch

minimum

to

3

/

32

inch

maximum

clearance

of

“

A

”

between

trip

link

(

3

)

and

blocking

lever

(

2

)

.

The

maximum

adjustment

at

point

“

A

"

should

not

exceed

3

/

32

inch

.

Closing

and

Opening

Times

and

Speeds

After

the

operation

intervals

noted

previously

,

the

closing

and

opening

times

are

recommended

to

be

checked

by

use

of

a

cycle

counter

,

travel

recorder

,

oscillograph

,

etc

.

to

monitor

the

time

from

energizing

to

contacts

touch

or

part

.

*

A

potentiometer

with

mounting

support

,

used

in

conjunc

-

tion

with

an

oscilloscope

or

oscillograph

,

and

instructions

are

available

on

special

order

for

specifically

checking

opening

and

closing

speeds

.

The

circuit

breaker

closing

and

opening

times

should

be

within

the

following

time

ranges

for

normal

operation

.

Control

Relay

Adjustment

(

See

Fig

.

8

)

The

control

relay

does

not

normally

require

any

adjustment

in

the

field

.

However

,

if

necessary

adjust

the

gap

between

the

control

device

lever

adjusting

screw

and

the

limit

switch

crank

arm

for

a

1

/

64

—

1

/

32

gap

with

the

closing

springs

charged

.

With

the

closing

springs

discharged

,

the

gap

between

the

lever

stop

and

the

lever

should

be

1

/

64

"

to

1

/

16

"

.

Closing

Time

Opening

Time

Range

—

MS

Range

—

MS

UV

(

M

AQJ

.

scn

«

w

AMO

LOCK

NUT

CONTROL

40

-

60

25

-

35

NOTES

:

1

.

Below

0

°

C

,

the

closing

times

will

increase

(

but

wilh

no

reduction

in

closing

force

)

,

and

opening

times

will

be

within

the

limits

.

2

.

Adjustments

to

correct

speeds

,

if

found

to

be

outside

limits

,

are

critical

and

the

nearest

District

Office

should

be

contacted

for

recommendations

.

LEVER

5

TOA

Operating

Mechanism

(

See

Fig

.

6

)

The

operating

mechanism

is

adjusted

at

the

factory

for

proper

operation

and

should

not

be

disturbed

unless

the

circuit

breaker

does

not

close

electrically

on

reclosing

duty

.

This

condition

is

caused

when

the

latch

check

switch

(

when

used

)

is

not

actuated

.

Circuit

breaker

should

not

close

before

trip

latch

(

4

)

has

reset

.

Adjustments

should

be

made

with

latch

(

4

)

against

reset

stop

pin

(

3

)

.

Turn

in

adjusting

screw

(

1

)

until

contacts

of

switch

(

2

)

“

break

”

(

as

indicated

by

an

audible

click

or

check

LIMIT

SWITCH

CHANK

CONTROL

DEVICE

Fig

.

B

Control

Relay

Courtesy of NationalSwitchgear.com

ABB

IB

6.2

.

7.7

.

-

1

Page

10

ASEA

BROWN

BOVERI

rupter

to

emit

some

X

-

radiation

which

could

be

a

health

hazardon

prolonged

exposure

at

close

range

.

Accordingly

,

even

though

the

emission

is

low

and

on

for

such

a

short

period

of

time

,

it

is

considered

appropriate

to

exercise

caution

.

Therefore

,

do

not

run

any

primary

circuit

dielectric

with

-

stand

tests

on

isolated

interrupters

with

open

contacts

,

above

rated

voltage

unless

test

personnel

are

adequately

shielded

or

they

are

no

less

than

six

feet

from

the

test

unit

.

Regarding

complete

breakers

,

it

is

noted

that

NO

hazard

-

ous

X

-

radiation

is

produced

with

closed

contacts

at

any

test

voltage

or

with

open

contacts

at

rated

voltage

and

there

should

be

no

cause

for

concern

.

Further

,

if

the

breaker

is

tested

in

its

switchgear

compartment

,

the

enclosure

steel

provides

sufficient

shielding

to

protect

personnel

from

X

-

radiation

at

the

test

voltages

recommended

below

at

the

normal

distances

maintained

for

electrical

safety

.

The

following

test

values

should

be

used

for

dielectric

testing

the

complete

breaker

and

are

to

be

applied

for

a

one

-

minute

period

.

LUBRICATION

The

15

VHK

circuit

breakers

are

lubricated

during

factory

assembly

as

follows

:

1

.

All

mechanism

parts

,

bearings

,

pins

,

etc

.

,

have

been

lubricated

with

Anderol

757

manufactured

by

Nuodex

,

Inc

.

(

formerly

Tenneco

Chemical

,

Inc

.

)

.

(

ABB

No

.

71

2994

A

,

4

oz

.

tube

)

.

If

the

grease

should

become

contaminated

or

unduly

oxidized

(

hardened

and

darkened

)

or

if

parts

are

replaced

,

any

relubrication

should

be

done

with

the

lubricants

noted

.

NOTES

:

1

.

The

mechanism

should

be

periodically

inspected

for

lubrication

contamination

:

frequency

of

inspection

is

de

-

pendent

on

operating

environment

.

2

.

Do

not

use

light

oil

to

lubricate

any

mechanism

parts

.

In

emergency

situations

,

Anderol

732

may

be

used

as

a

temporary

lubricant

.

In

these

cases

,

allow

time

for

the

solvents

to

evaporate

prior

to

any

mechanical

operations

.

It

is

mandatory

that

the

breaker

undergo

thorough

lubrica

-

tion

with

Anderol

757

at

the

next

maintenance

interval

.

Use

of

solvents

to

free

contaminated

lubricant

is

strictly

forbid

-

den

without

immediate

relubrication

using

Anderol

757

.

Note

that

bearing

surfaces

must

be

repacked

a

this

will

require

disassembly

of

the

mechanism

.

Do

not

operate

t

circuit

breaker

without

completing

this

procedure

.

3

.

The

charging

motor

is

sealed

and

no

lubrication

is

required

.

60

Hz

Primary

Circuit

36.0

kV

‘

Secondary

Circuit

(

Control

)

1100

V

«

»

•

‘

If

it

is

desired

to

make

a

dielectric

test

on

the

secondary

control

wiring

,

turn

the

spring

charging

motor

disconnect

switch

(

1

,

Fig

.

3

)

to

the

“

OFF

"

position

.

Apply

test

voltage

(

1100

V

-

AC

)

for

one

minute

to

each

of

the

secondary

disconnect

contacts

at

the

rear

of

the

circuit

breaker

.

If

it

is

desired

to

make

a

dielectric

test

on

the

spring

charging

motor

,

turn

the

motor

disconnect

switch

(

1

,

Fig

.

3

)

to

the

“

ON

”

position

.

Apply

test

voltage

(

540

V

-

AC

)

for

one

minute

to

the

motor

circuit

.

DIELECTIRIC

TESTS

It

is

recommended

that

dielectric

withstand

tests

be

made

prior

to

use

and

then

at

routine

maintance

periods

to

verify

the

integrity

of

vacuum

interrupters

.

If

,

during

the

dielectric

withstand

test

,

the

required

test

voltage

cannot

be

sus

-

tained

across

the

open

contacts

of

the

vacuum

interrupter

,

the

interrupter

is

faulty

and

must

be

replaced

.

Always

insure

that

the

contact

air

gap

is

correct

betore

conducting

primary

circuit

dielectric

tests

.

ELECTRICAL

CHARACTERISTICS

OF

CONTROL

DEVICES

For

operating

voltage

ranges

for

various

nominal

control

voltages

,

refer

to

Table

1

.

For

average

current

values

at

various

nominal

control

voltages

,

refer

to

Table

2

.

The

current

values

given

in

this

table

are

average

.

,

steady

state

values

and

momentary

inrush

currents

for

all

charging

motors

and

AC

coils

are

approximately

six

to

eight

times

these

values

.

CAUTION

CAUTION

CAUTION

CAUTION

While

the

procedure

for

dielectric

testing

a

vacuum

breaker

is

similar

to

that

for

any

other

type

breaker

,

there

are

two

areas

which

require

extra

CAUTION

in

handling

.

1

.

The

internal

shield

of

a

vacuum

interruptercan

acquire

an

electrical

charge

which

is

usually

retained

even

after

the

voltage

is

removed

.

On

certain

types

of

interrupters

,

this

shield

is

attached

to

the

exposed

mid

-

band

ring

and

a

groun

-

ding

stick

should

be

used

to

discharge

the

ring

before

working

on

the

device

.

2

.

Dielectric

test

voltages

higher

than

rated

voltage

,

applied

across

open

contacts

,

may

cause

a

vacuum

inter

-

ELECTRICAL

OPERATING

SEQUENCE

Please

refer

to

the

specific

schematic

diagrams

and

other

operational

information

furnished

with

your

order

.

Fig

.

9

is

provided

as

a

typical

schematic

for

general

information

on

electrical

operation

.

Courtesy of NationalSwitchgear.com