Ge Power/vac vm-4.16 User manual

INSTRUCTIONS

AN

©

RECOMMENDED

PARTS

FOR

MAINTENANCE

GEK

-

39672

C

SUPERSEDES

GF

.

K

-

39672

B

/

J

POWER

/

VAC

*

METAL

-

CLAD

SWITCHGEAR

TYPES

VM

-

4.16

AND

VM

-

13.8

FOR

VACUUM

CIRCUIT

BREAKER

TYPES

VB

-

4.16

,

VB

-

7.2

AND

VB

-

13.8

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GENERAL

ELECTRIC

£

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I

Courtesy of NationalSwitchgear.com

CONTENTS

Page

5

Introduction

5

Receiving

,

Handling

&

Storage

.

Receiving

Handling

Storage

of

Indoor

Equipment

.

Storage

of

Outdoor

Equipment

5

9

15

Description

Secondary

Enclosure

Primary

Enclosure

Breaker

Removable

Element

Breaker

Lift

Truck

Breaker

Racking

Mechanism

Remote

Racking

Device

Primary

Disconnects

Bus

Compartment

.

'

Current

Transformer

Compartment

Primary

Termination

Space

Potential

Transformers

Current

Limiting

Fuses

and

Control

Power

Transformer

Dummy

Removable

Element

Ground

and

Test

Device

.

15

17

19

20

21

Installation

Location

Anchoring

.

Indoor

Equipment

-

Floor

Preparation

Outdoor

Equipment

Outdoor

Equipment

With

Protected

Aisle

Outdoor

Equipment

With

Common

Aisle

Breaker

Removable

Element

.

Test

Cabinet

Addition

of

Units

to

Existing

Equipment

..

Connections

Main

Bus

Assembly

Taped

Joints

for

13

,

8

kV

Equipment

Taped

Joints

for

4.16

kV

Equipment

Bus

Duct

Primary

Cables

Insulating

Primary

Cable

Terminations

Potheads

Termination

Without

Pothead

Ground

Fault

Current

Transformers

(

Through

—

Type

)

Control

Cables

Ground

Bus

Lightning

Protection

Surge

Supressors

Roof

Entrance

Bushing

;

21

22

23

25

26

27

28

29

.

29

v

.

29

2

Courtesy of NationalSwitchgear.com

Page

Testing

and

Inspection

32

1

-

J

Operation

Breaker

Installation

.

Breaker

Racking

with

Front

Door

Closed

Remote

Racking

Attachment

Positive

Interlock

Negative

Interlock

Spring

Discharge

Interlock

Interference

Interlock

Closing

Spring

Gag

Interlock

Key

Lock

Padlocks

Stationary

Auxiliary

Switch

Breaker

Position

Switch

Space

Heaters

Maintenance

Recommended

Annual

Maintenance

.

Outdoor

Acrylic

Paint

Finish

32

33

34

35

36

37

38

Renewal

Parts

39

i

.

3

Courtesy of NationalSwitchgear.com

LIST

OF

ILLUSTRATIONS

Page

Figure

Typical

Indoor

Power

/

Vac

*

Metal

-

dad

Switchgear

Equipment

Typical

Outdoor

Power

/

Vac

*

Metal

-

clad

Switchgear

Equipment

.

Typical

Outdoor

Power

/

Vac

*

Metal

-

clad

Switchgear

Equipment

with

Protected

Aisle

Typical

Outdoor

Power

/

Vac

*

Metal

-

clad

Switchgear

Equipment

with

Common

Aisle

Installation

Details

for

Indoor

Power

/

Vac

*

Metal

-

clad

Switchgear

Installation

Details

for

Outdoor

Power

/

Vac

*

Metal

-

clad

Switchgear

Installation

Details

for

Outdoor

Powcr

/

Vac

*

Metal

-

clad

Switchgear

withProtected

Aisle

Installation

Details

for

Outdoor

Power

/

Vac

*

Metal

-

clad

Switchgear

with

Common

Aisle

Side

Section

View

Power

/

Vac

*

Metal

-

clad

Switchgear

Power

/

Vac

*

Breaker

and

Lift

Truck

Remote

Racking

Device

Primary

Disconnects

1200

,

2000

,

3000

Amp

.

Potential

Transformer

Drawout

Carriage

Control

Power

Transformer

Drawout

Carriage

.

Test

Cabinet

Outdoor

Metal

-

clad

Switchgear

—

Addition

of

Units

to

a

Line

-

up

Outdoor

Metal

-

clad

Switchgear

with

Protected

Commoii

Aisle

—

Addition

of

Units

to

Line

-

Up

Bolt

Torque

Values

for

Metal

-

clad

Switchgear

Bus

Insulating

Boot

Insulation

of

Connection

Bars

Bus

Duct

Gaskets

Installation

of

Primary

Cables

Cable

Termination

without

Pothead

,

Single

-

conductor

Rear

View

of

Unit

Showing

Through

-

type

Current

Transformers

Control

Cable

Guide

Taping

of

Roof

Entrance

Termination

Racking

Mechanism

.

Lift

Truck

Connection

to

Rails

Racking

Arm

Position

Indicator

Positive

Interlock

Negative

Interlock

Key

Lock

and

Padlocks

Closing

Spring

Discharge

Interlock

Interference

Interlock

Stationary

Auxiliary

Switch

and

Breaker

Position

Switch

Right

Hand

Track

Assembly

for

Vacuum

Metal

Clad

.

Left

Hand

Track

Assembly

for

Vacuum

Metal

Clad

Spreader

Bar

,

Chain

and

Idler

Sprocket

for

Vacuum

Metal

Clad

Connection

Boots

for

Primary

Disconnects

,

Surge

Suppressors

,

and

Bus

4.16

kV

Inter

Unit

Barrier

13.8

kV

Inter

Unit

Barrier

4.16

kV

Primary

Disconnect

13.8

kV

Primary

Disconnect

Vacuum

Metal

-

Clad

Breaker

Unit

6

1

6

2

7

3

7

4

8

,

9

5

10

,

11

6

12

,

13

14

,

15

7

8

16

9

16

10

17

11

18

12

19

13

19

14

23

15

24

16

24

17

25

18

25

19

26

20

27

21

27

22

27

23

29

24

30

25

30

26

31

27

31

28

33

29

34

30

35

31

35

32

36

33

36

34

37

35

39

36

40

37

40

38

41

'

39

41

40

42

41

42

43

,

.

43

44

4

Courtesy of NationalSwitchgear.com

POWER

/

VAC

*

METAL

-

CLAD

SWITCHGEAR

TYPES

VM

-

4.16

AND

VM

-

13.8

FOR

VACUUM

CIRCUIT

BREAKERS

TYPES

VB

-

4.16

,

VB

-

7.2

AND

VB

-

13.8

(

.

J

INTRODUCTION

equipment

is

built

into

a

weatherproof

housing

as

in

Figs

.

2

,

3

and

4

.

The

equipment

is

not

designed

for

exposure

to

dripping

liquids

as

this

condition

is

not

a

usual

ANSI

service

condition

.

Dripping

liquids

can

destroy

the

integrity

of

the

insulation

system

and

must

be

avoided

.

Metal

-

clad

switchgear

is

equipment

designed

for

the

pro

-

tection

,

instrumentation

and

control

of

various

types

of

electrical

apparatus

and

power

circuits

.

\

The

switchgear

consists

of

one

or

more

vertical

sections

/

which

are

mounted

side

by

side

and

connected

mechanically

and

electrically

together

to

form

a

complete

switching

equipment

.

Typical

equipments

are

shown

in

Figs

.

1

,

2

,

3

and

>

*

•

&

NOMINAL

INTERRUPT

-

4

.

TYPE

EQUIP

-

CIRCUIT

MENT

BREAKER

MAXIMUM

VOLTAGE

CONTINUOUS

CURRENT

AMPERES

ING

The

circuit

breakers

are

easily

removable

to

provide

maxi

-

mum

accessibility

for

maintenance

with

minimum

interruption

of

services

.

The

switchgear

is

designed

to

provide

a

high

degree

of

safety

to

the

operator

.

All

equipment

is

enclosed

in

grounded

metal

compartments

.

CAPACITY

MV

A

KV

VM

-

4.16

VB

-

4.16

-

250

VM

-

416

VB

-

4.16

-

350

4.76

1200

-

2000

1200

-

2000

250

4.76

350

3000

The

equipment

is

available

in

the

ratings

listed

in

the

following

table

.

The

ratings

of

the

equipment

and

devices

are

based

on

usual

service

conditions

as

covered

in

ANSI

stan

-

dards

.

Operation

at

currents

above

the

equipment

rating

will

result

in

temperature

rises

in

excess

of

these

standards

,

and

is

not

recommended

.

For

outdoor

installation

the

same

basic

VM

-

13.8

VB

-

7.2

-

500

VM

-

13.8

VB

-

13.8

-

500

VM

-

13.8

VIM

3.8

-

750

VM

-

13.8

VB

-

13.8

-

1000

8.25

1200

-

2000

1200

-

2000

1200

-

2000

1200

-

2000

500

15.0

500

15.0

750

15.0

1000

3000

RECEIVING

,

HANDLING

AND

STORAGE

packed

in

one

of

the

cases

.

The

case

is

especially

marked

and

its

number

can

also

be

obtained

from

the

Memorandum

of

Shipment

,

To

avoid

the

loss

of

small

parts

when

unpacking

,

the

contents

of

each

case

should

be

carefully

checked

against

the

Packing

Details

before

discarding

the

packing

material

.

Notify

the

nearest

General

Electric

Company

representative

at

once

if

any

shortage

of

material

is

discovered

.

RECEIVING

Every

case

or

crate

leaving

the

factory

is

plainly

marked

at

convenient

places

with

case

number

,

requisition

number

,

customer

'

s

order

,

front

or

rear

,

and

when

for

size

and

other

reasons

it

is

necessary

to

divide

the

equipment

for

shipment

,

with

the

section

numbers

of

the

portion

of

equipment

enclosed

in

each

shipping

case

.

Before

leaving

the

factory

all

elements

are

carefully

inspected

and

packed

by

workmen

experienced

in

the

proper

handling

and

packing

of

electrical

equipment

.

Upon

receipt

of

The

contents

of

each

package

of

the

shipment

are

listed

in

the

Packing

Details

.

This

list

is

forwarded

with

the

shipment

,

These

instructions

do

not

purport

to

cover

all

details

or

variations

in

equipment

nor

to

provide

for

every

pos

-

sible

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

General

Electric

Company

.

To

the

extent

required

the

products

described

herein

meet

applicable

ANSI

,

IEEE

and

NEMA

standards

;

but

no

such

assurance

is

given

with

respect

to

local

codes

and

ordinances

because

they

vary

greatly

.

t

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,

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of

the

General

Electric

Company

5

Courtesy of NationalSwitchgear.com

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T

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on

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Outdoor

Power

/

Vac

*

Metal

-

Clad

Switchgear

Equipment

Fig

.

2

6

Courtesy of NationalSwitchgear.com

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Power

/

Vac

*

Metal

-

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Switchgear

with

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Aisle

y

•

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j

Ux

.

*

-

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.

4

Typical

Outdoor

Power

/

Vac

*

Metal

-

Clad

Switchgear

with

Common

Aisle

7

Courtesy of NationalSwitchgear.com

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Installation

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for

Indoor

Power

/

Vac

*

Metal

-

Clad

Switchgear

Fig

.

5

8

Courtesy of NationalSwitchgear.com

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THE

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f

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(

l

WITH

OR

NOT

MORE

THAN

3

"

LOWER

THAN

THE

SWITCHGEAR

.

PAD

OR

FLOOR

STEEL

.

NOR

SHOULD

THE

FRO

H

7

Of

TliE

SWITCHGEAR

PAD

OR

FLOOR

STEEL

PROJCCT

BBVOND

THE

FRONT

DCVK

PANEL

OF

THE

POWER

VAC

EQUIPMENT

VMM

LEVEL

WITH

THE

FINISHED

FLOOR

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LEADS

.

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.

5

Installation

Details

for

Indoor

Power

/

Vac

*

Metal

-

Clad

Switchgear

(

Continued

)

STORAGE

OF

INDOOR

EQUIPMENT

any

apparatus

an

immediate

inspection

should

be

made

for

any

damage

sustained

while

enroute

.

If

damage

is

evident

or

an

indication

of

rough

handling

is

visible

,

a

claim

for

damage

should

be

filed

at

once

with

the

transportation

company

and

the

General

Electric

Company

notified

promptly

.

Information

as

to

damaged

parts

,

part

number

,

case

number

,

requisition

number

,

etc

.

,

should

accompany

the

claim

.

If

it

is

necessary

to

store

the

equipment

for

any

length

of

time

,

the

following

precautions

should

be

taken

to

prevent

breakage

,

corrosion

,

damage

or

deterioration

:

HANDLING

1

.

Uncrate

the

equipment

.

Check

it

thoroughly

for

damage

.

2

.

Cover

important

parts

such

as

jack

screws

,

gears

and

chain

of

racking

mechanism

,

linkage

and

moving

parts

with

a

heavy

oil

or

grease

,

such

as

D

6

B

15

(

Mobil

Before

uncrating

,

indoor

equipment

may

be

moved

by

crane

with

slings

under

the

skids

.

Spreaders

should

be

used

to

keep

the

cables

from

rubbing

against

the

equipment

.

If

crane

facilities

are

unavailable

,

rollers

under

the

skids

may

be

used

.

4

Fig

.

5

shows

the

suggested

method

of

anchoring

the

switch

-

ry

f

gear

after

it

is

removed

from

the

skids

.

After

the

equipment

is

in

place

the

lifting

brackets

should

be

removed

.

28

)

.

3

.

Store

in

a

clean

,

dry

place

with

a

moderate

temperature

(

such

as

40

-

100

°

F

)

and

cover

with

a

suitable

cover

to

prevent

deposits

of

dirt

or

other

foreign

substances

upon

movable

parts

and

electrical

contact

surfaces

.

Methods

of

handling

outdoor

equipment

are

shown

in

Figs

.

6

,

7

and

8

.

After

the

equipment

is

in

place

the

lifting

brackets

should

be

removed

.

4

.

Batteries

should

be

uncrated

and

put

on

trickle

charge

immediately

upon

receipt

.

IJ

9

Courtesy of NationalSwitchgear.com

5

.

If

dampness

or

condensation

may

be

encountered

in

the

storage

location

,

(

can

occur

with

rapid

temperature

changes

)

heaters

should

be

placed

inside

the

equipment

to

prevent

moisture

damage

.

Approximately

300

watts

of

heat

per

vertical

stack

will

be

required

.

The

suggested

arrangement

is

one

75

-

watt

heat

element

in

each

breaker

and

primary

cable

compartment

.

Remove

all

cartons

and

other

miscellaneous

material

packed

inside

units

before

energizing

any

heaters

.

If

the

equipment

has

been

subjected

to

moisture

it

should

be

carefully

dried

out

using

forced

warm

air

and

then

tested

with

a

1000

or

2500

volt

megger

.

A

reading

of

at

least

200

megohms

should

be

obtained

.

2

.

Cover

important

parts

such

as

jack

screws

,

gears

and

chain

of

racking

mechanism

,

linkage

and

moving

machine

finished

parts

with

a

heavy

oil

or

grease

such

as

D

6

B

15

(

Mobil

28

)

.

3

.

Batteries

should

be

uncrated

and

put

on

trickle

charge

immediately

upon

receipt

.

4

.

Dampness

or

condensation

can

be

prevented

by

making

a

temporary

power

supply

connection

to

the

heaters

alr

eady

installed

in

the

equipment

.

If

the

equipment

lias

been

subjected

to

moisture

it

should

be

dried

out

in

the

same

manner

as

with

indoor

equipment

as

described

.

;

6

.

Breakers

should

be

prepared

for

storage

separately

.

Re

-

fer

to

the

breaker

instruction

book

GEK

-

39671

for

details

.

Caution

:

Be

sure

that

fuses

to

CPT

secondary

have

been

removed

before

energizing

the

temporary

connection

to

the

heaters

.

This

is

to

prevent

a

back

feed

of

high

voltage

at

CPT

primary

.

STORAGE

OF

OUTDOOR

EQUIPMENT

5

.

Breakers

should

be

prepared

for

storage

separately

.

Refer

to

the

breaker

instruction

book

GEK

-

39671

for

details

.

1

,

Uncrate

the

equipment

.

Check

it

thoroughly

for

damage

.

UFT

-

SUte

.

SPREADER

.

r

:

EE

I J

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r

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.

ii

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WOOD

-

BOTH

ENDS

.

LIFT

ANGLE

;

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o

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VIEW

.

FRONT

VIEW

.

Fig

.

6

Installation

Details

for

Outdoor

Power

/

’

Vac

*

Metal

-

clad

Switchgear

10

Courtesy of NationalSwitchgear.com

0

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6

Installation

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for

Outdoor

Power

/

Vac

*

Metal

-

clad

Switchgear

(

continued

)

11

Courtesy of NationalSwitchgear.com

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/

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*

Metal

-

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with

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Aisle

12

Courtesy of NationalSwitchgear.com

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7

Installation

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Power

/

Vac

*

Metal

-

clad

Switchgear

with

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Aisle

(

continued

)

13

Courtesy of NationalSwitchgear.com

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8

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Power

/

Vac

*

Metal

-

dad

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with

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14

Courtesy of NationalSwitchgear.com

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8

Installation

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for

Outdoor

Power

/

Vac

/

'

Metal

-

clad

Switchgear

with

Common

Aisle

(

continued

)

DESCRIPTION

BREAKER

REMOVABLE

ELEMENT

Each

unit

is

made

up

of

a

secondary

enclosure

and

a

primary

enclosure

as

shown

in

Fig

.

9

.

The

removable

element

consists

of

a

Power

/

Vac

*

circuit

breaker

which

includes

an

operating

mechanism

,

interlocks

,

primary

and

secondary

disconnecting

devices

.

The

Power

/

Vac

*

breakers

are

equipped

with

wheels

for

easy

movement

along

the

floor

.

SECONDARY

ENCLOSURE

The

secondary

enclosure

is

located

at

the

front

of

the

unit

where

the

breaker

is

withdrawn

.

This

enclosure

consists

of

a

compartment

with

a

hinged

panel

upon

which

are

mounted

the

necessary

instruments

,

control

and

protective

devices

.

The

terminal

blocks

,

fuse

blocks

,

and

some

control

devices

are

mounted

inside

the

enclosure

on

the

side

sheets

and

on

the

internal

device

panel

.

A

wiring

space

is

provided

across

the

top

of

the

unit

to

run

wires

between

vertical

sections

.

A

lift

truck

(

Fig

.

10

)

is

provided

for

insertion

and

removal

of

the

circuit

breaker

from

the

metal

-

clad

unit

.

Power

/

Vac

*

circuit

breakers

of

the

same

rating

are

inter

-

changeable

in

their

corresponding

metal

-

clad

units

.

An

inter

-

ference

interlock

is

provided

on

the

rear

of

each

circuit

breaker

to

insure

that

the

properly

rated

breaker

is

used

with

in

the

proper

metal

-

clad

unit

.

(

See

OPERATION

—

INTER

-

FERENCE

INTERLOCK

)

.

PRIMARY

ENCLOSURE

The

primary

enclosure

contains

the

high

voltage

equipment

and

connections

.

It

consists

of

the

breaker

compartments

,

the

bus

compartment

,

the

cable

termination

compartment

,

and

auxiliary

compartments

for

potential

and

control

power

transformers

.

Each

of

these

compartments

is

separated

from

the

others

by

metal

barriers

for

reliability

and

safety

.

For

a

detailed

description

of

the

Power

/

Vac

*

breaker

and

its

operation

the

breaker

instruction

book

GEK

39671

should

be

consulted

.

BREAKER

LIFT

TRUCK

Interference

Interlocks

(

Fig

.

34

)

are

provided

on

the

metal

-

clad

unit

to

permit

only

the

circuit

breaker

with

the

correct

voltage

,

continuous

current

,

mva

and

momentary

rating

to

be

inserted

.

For

ease

of

breaker

handling

during

installation

and

removal

,

a

breaker

lift

truck

is

furnished

as

a

standard

15

Courtesy of NationalSwitchgear.com

*

•

»

•

1

—

Primary

Bus

2

—

Breaker

Compartment

3

—

Load

Take

-

Offs

4

—

Secondary

Compartment

•

r

;

•

?

.

;

3

r

Fig

.

9

Side

Section

View

Power

/

Vac

*

Metal

-

clad

Switchgear

r

-

—

,

v

7

"

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Truck

2

—

Breaker

3

—

Rails

4

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*

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00

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cm

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o

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T

.

,

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Fig

.

10

Power

/

Vac

*

Breaker

and

Lift

Truck

16

Courtesy of NationalSwitchgear.com

.

{

*

•

V

-

=

.

-

Sv

-

V

.

v

;

^

7

Y

Fig

,

11

Remote

Racking

Operator

accessory

with

each

Power

/

Vac

*

switchgear

order

(

Fig

.

10

)

.

This

accessory

device

is

used

to

elevate

the

breaker

from

the

floor

or

working

platform

to

the

level

of

the

tracks

in

the

switchgear

cubicle

.

Docking

of

the

lifting

device

rails

to

the

switchgear

tracks

is

provided

for

maximum

safety

.

(

See

O

OPERATION

-

BREAKER

INSTALLATION

)

.

easily

mounted

to

the

breaker

unit

front

door

and

is

designed

for

quick

transfer

between

units

.

The

remote

racking

operator

is

furnished

in

two

operating

voltage

versions

.

The

115

VAC

,

50

/

60

hertz

model

has

a

six

foot

electrical

cord

with

standard

three

prong

plug

to

fit

a

grounded

receptacle

or

extension

cord

.

The

230

VAC

,

50

/

60

hertz

model

has

a

three

wire

six

foot

cord

to

which

the

pur

-

chaser

applies

his

standard

plug

.

The

remote

racking

operator

is

provided

with

a

two

posi

-

tion

directional

switch

,

an

“

On

-

Off

5

circuit

breaker

and

a

push

button

control

box

attached

with

a

30

foot

extension

cord

.

Instructions

for

the

remote

racking

operator

are

found

in

GEK

-

39683

.

s

&

tit

BREAKER

RACKING

MECHANISM

When

installed

in

the

switchgear

cubicle

the

removable

element

is

supported

by

two

horizontal

steel

tracks

,

one

on

each

side

of

the

cubicle

.

The

racking

mechanism

moves

the

breaker

element

along

these

tracks

between

the

connected

and

test

positions

.

This

mechanism

consists

of

heavy

-

duty

steel

jack

screws

which

carry

nuts

that

engage

the

sides

of

the

removable

element

.

The

racking

mechanism

may

be

manually

operated

with

the

racking

handle

which

is

furnished

with

each

equipment

.

PRIMARY

DISCONNECTS

The

1200

and

2000

ampere

primary

disconnects

consist

of

two

rows

of

silver

-

plated

copper

fingers

mounted

on

either

side

of

the

circuit

breaker

studs

.

These

fingers

are

held

in

place

with

a

spider

which

positions

the

fingers

and

fastens

them

to

the

breaker

.

Wipe

pressure

is

obtained

by

tension

springs

between

the

rows

of

fingers

which

pull

them

together

.

When

the

circuit

breaker

is

connected

to

the

metal

-

clad

studs

,

the

spring

force

on

the

fingers

is

divided

between

the

breaker

stud

and

metal

-

clad

studs

.

See

Fig

.

12

.

I

The

breaker

cannot

be

moved

between

the

connected

and

|

test

positions

unless

it

has

been

tripped

.

The

breaker

cannot

be

?

closed

unless

it

is

in

the

connected

or

test

position

.

1

••

SS

For

a

detailed

explanation

of

the

racking

mechanism

refer

to

description

under

OPERATION

-

CLOSED

DOOR

BREAK

-

ER

RACKING

.

REMOTE

RACKING

OPERATOR

On

3000

ampere

primary

disconnects

silver

-

plated

copper

fingers

are

positioned

in

a

circular

configuration

and

are

supported

by

a

noil

-

magnetic

spider

.

This

spider

spaces

the

fingers

equally

around

the

breaker

stud

and

fastens

them

to

The

electrically

operated

racking

device

(

see

Fig

.

11

)

provides

a

convenient

means

for

racking

a

breaker

between

the

connected

and

test

positions

from

a

remote

location

.

It

is

17

Courtesy of NationalSwitchgear.com

-

J

(

.

-

i

'

;

ri

*

.

;

=

-

v

ON

(

N

v

-

\

-

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-

1200

AMP

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co

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GO

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2

-

2000

AMP

'

T

ij

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l

f

.

I

f

"

3

-

3000

AMP

•

3

Si

-

Fig

.

12

Primary

Disconnects

18

Courtesy of NationalSwitchgear.com

provided

in

tills

compartment

for

connecting

the

purchaser

’

s

primary

cable

by

means

of

potheads

or

clamp

-

type

terminals

.

Two

hole

NEMA

drilling

for

two

cables

per

phase

is

provided

at

all

cable

connection

points

.

the

end

of

the

stud

.

The

fingers

are

held

in

contact

with

the

breaker

stud

by

a

stainless

steel

garter

spring

.

A

second

garter

spring

on

the

outer

end

of

the

finger

provides

contact

pressure

when

the

finger

assembly

is

connected

to

the

tube

in

the

metal

-

clad

unit

.

See

Fig

.

12

.

In

double

breaker

vertical

sections

a

steel

duct

serves

as

a

pull

-

box

and

barrier

to

separate

the

two

outgoing

cable

circuits

.

BUS

COMPARTMENT

The

main

buses

are

enclosed

in

a

metal

compartment

with

removable

front

covers

to

provide

accessibility

.

The

bus

is

supported

and

insulated

by

molded

glass

-

reinforced

-

polyester

barriers

which

are

flame

retardant

and

track

resistant

.

In

IS

kV

equipments

polyester

supports

with

porcelain

sleeves

are

1

provided

.

The

primary

termination

space

of

a

unit

is

accessible

by

removal

of

the

bolted

rear

cover

.

POTENTIAL

TRANSFORMERS

Potential

transformers

are

located

in

an

auxiliary

unit

,

Up

to

three

transformers

can

be

mounted

on

a

movable

carriage

equipped

with

primary

and

secondary

disconnecting

devices

.

When

the

potential

transformers

are

disconnected

,

they

are

at

a

safe

striking

distance

from

all

live

parts

of

the

switchgear

.

In

addition

a

grounding

device

is

provided

which

contacts

the

fuses

when

the

potential

transformers

are

disconnected

,

effectively

discharging

the

transformers

.

In

this

position

the

transformer

fuses

may

be

safely

removed

and

replaced

.

A

barrier

mounted

at

the

rear

of

the

carriage

moves

with

the

carriage

to

a

position

in

front

of

the

stationary

part

of

the

primary

disconnect

device

,

providing

a

safe

striking

distance

from

all

live

parts

.

See

Fig

.

13

.

Bus

bars

are

insulated

with

high

dielectric

thermosetting

epoxy

insulation

applied

using

the

fluidized

bed

process

.

This

insulation

is

suitable

for

a

total

temperature

of

105

°

C

.

All

bolted

joints

have

silver

-

to

-

silver

connections

for

low

contact

resistance

.

The

joints

are

insulated

with

a

molded

polyvinyl

-

chloride

boot

.

CURRENT

TRANSFORMER

COMPARTMENT

The

current

transformers

are

mounted

over

the

primary

bushings

in

the

rear

of

the

breaker

compartment

and

are

isolated

from

the

breaker

by

the

shutter

barrier

.

Current

transformers

are

front

accessible

by

removal

of

the

shutter

barrier

.

The

equipment

must

be

deenergized

,

before

any

component

is

touched

or

serious

injury

could

result

.

PRIMARY

TERMINATION

SPACE

CURRENT

LIMITING

FUSES

AND

CONTROL

POWER

TRANSFORMER

Current

limiting

fuses

with

high

interrupting

rating

are

sometimes

used

in

metal

-

clad

switchgear

to

protect

small

transformers

or

circuits

where

circuit

breakers

cannot

be

economically

or

functionally

justified

.

The

primary

termination

space

of

each

breaker

unit

is

isolated

from

the

other

equipment

by

metal

barriers

.

Space

is

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CO

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.

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Fig

.

14

Control

Power

Transformer

Drawout

Carriage

Fig

.

13

Potential

Transformer

Drawout

Carriage

19

Courtesy of NationalSwitchgear.com

The

fuses

are

mounted

o

%

a

movable

carriage

equipped

with

primary

and

secondary

disconnecting

devices

.

Single

phase

control

power

transformers

of

15

leva

and

smaller

and

their

secondary

breaker

are

mounted

on

the

carriage

with

the

fuses

.

See

Fig

.

14

.

Larger

control

power

transformers

up

to

37.5

kva

single

phase

or

45

kva

3

phase

are

located

in

the

cable

compartment

behind

their

associated

fuse

carriage

and

their

secondary

breaker

is

located

behind

a

hinged

cover

on

the

upper

cable

compartment

.

available

the

key

interlock

can

be

operated

to

withdraw

the

positive

interlock

extension

.

The

dummy

element

now

looks

like

an

open

breaker

,

and

it

can

be

racked

in

or

out

.

As

long

as

the

positive

interlock

extension

is

withdrawn

,

the

key

is

captured

and

it

cannot

be

released

unless

the

dummy

element

is

in

the

CONNECTED

or

TEST

position

or

completely

with

-

drawn

.

Hence

,

the

sources

to

which

the

dummy

may

con

-

nect

cannot

be

re

-

energized

until

the

dummy

is

in

one

of

these

three

positions

.

»

When

the

fuses

are

disconnected

,

they

are

at

a

safe

striking

distance

from

all

live

parts

of

the

switchgear

.

In

addition

a

grounding

device

is

provided

which

contacts

the

fuses

after

they

are

disconnected

,

effectively

removing

any

static

charge

from

the

fuses

.

In

this

position

the

fuses

may

be

safely

removed

and

replaced

.

The

disconnecting

devices

are

capable

of

interrupting

transformer

magnetizing

current

,

but

should

not

be

used

to

interrupt

load

current

.

Mechanical

or

key

interlocks

are

applied

to

prevent

operating

the

disconnecting

device

while

the

load

is

connected

.

This

is

generally

ac

-

complished

by

interlocking

so

that

the

transformer

secondary

breaker

must

be

locked

in

the

open

position

before

the

disconnecting

device

can

be

connected

or

disconnected

.

The

key

for

the

dummy

element

interlock

will

usually

be

obtained

from

a

transfer

lock

at

which

all

the

source

keys

are

accumulated

and

captured

before

the

dummy

element

key

can

be

obtained

.

GROUND

AND

TEST

DEVICE

This

device

is

designed

to

make

either

the

upper

or

lower

primary

conductors

in

the

breaker

unit

readily

accessible

.

The

type

PVV

ground

and

test

device

,

provides

a

convenient

means

of

grounding

the

cables

or

the

bus

in

order

to

safeguard

personnel

who

may

be

working

on

the

cables

or

the

equipment

.

The

device

can

be

used

for

applying

power

for

high

potential

tests

or

for

fault

location

.

It

can

be

used

to

measure

insulation

resistance

(

megger

)

.

By

using

potential

transformers

,

it

can

also

be

used

for

phasing

out

cables

.

Refer

to

the

instruction

book

provided

for

this

device

.

If

“

hot

sticks

”

are

used

they

should

be

insulated

.

Current

limiting

fuse

and

control

power

transformer

roll

-

outs

are

located

in

auxiliary

units

.

DUMMY

REMOVABLE

ELEMENT

Dummy

removable

elements

,

are

used

as

a

means

of

isolating

circuits

or

bus

sections

,

where

operation

is

infrequent

and

a

circuit

breaker

cannot

be

economically

justified

.

The

device

consists

of

a

circuit

breaker

mechanism

frame

and

primary

insulator

supports

with

six

primary

studs

including

disconnecting

devices

.

Copper

rods

are

bolted

in

the

location

normally

occupied

by

vacuum

interrupters

.

The

stationary

structure

is

the

same

as

for

a

circuit

breaker

.

When

the

device

is

fully

racked

in

,

it

connects

the

top

set

of

metal

-

clad

primary

disconnects

to

the

bottom

set

.

CAUTION

-

NOTE

THAT

THE

MAIN

SWITCHGEAR

BUS

IS

CONNECTED

TO

THE

LOWER

STUDS

WHEN

THE

DEVICE

IS

INSTALLED

IN

AN

UPPER

COMPARTMENT

AND

TO

THE

UPPER

STUDS

WHEN

THE

DEVICE

IS

INSTALLED

IN

A

LOWER

COMPARTMENT

’

Refer

to

Fig

.

9

,

which

shows

a

side

section

view

of

the

switchgear

,

for

clarification

.

In

addition

to

the

device

described

above

,

there

is

available

the

deluxe

power

-

operated

type

PMV

'

device

which

has

a

.

self

-

contained

bus

or

line

selector

switch

and

a

separately

controlled

,

power

operated

,

three

-

phase

grounding

switch

.

The

PMV

device

is

a

dead

-

front

design

with

mechanical

and

electrical

interlocks

,

provision

for

remote

control

and

plug

-

type

cable

testing

and

phasing

.

The

primary

conductors

required

for

grounding

are

self

-

contained

,

with

no

external

cable

connections

required

.

An

interlock

system

is

provided

to

insure

that

the

dummy

element

cannot

be

racked

in

or

out

,

unless

all

sources

to

which

it

may

connect

are

de

-

energized

.

The

dummy

element

includes

an

extension

from

the

side

which

is

an

exact

duplicate

of

the

positive

interlock

extension

on

a

standard

circuit

breaker

when

that

breaker

is

closed

.

Hence

,

insofar

as

the

racking

mechanism

is

concerned

the

dummy

element

locks

exactly

like

a

closed

circuit

breaker

,

and

the

positive

interlock

prevents

it

from

being

racked

in

or

out

.

The

PMV

device

is

designed

for

maximum

safety

to

personnel

while

accomplishing

all

the

basic

required

grounding

and

testing

functions

.

Refer

to

the

instruction

book

provided

for

this

device

.

A

key

lock

is

provided

on

the

dummy

element

.

It

takes

a

key

which

becomes

available

only

when

all

sources

,

to

which

the

dummy

might

connect

,

are

de

-

energized

.

When

the

key

is

20

Courtesy of NationalSwitchgear.com

GE Power/Vac VM-4.16 User manual

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