FEDERAL PACIFIC DST 5-75 Guía

MED

VOLTAGE

INSTRUCTIONS

FOR

INSTALLATION

Type

DST

Magnetic

Air

Circuit

Breakers

DST

November

1959

Courtesy of NationalSwitchgear.com

Federal

Pacific

Type

DST

and

DST

Magnetic

Air

Circuit

Breakers

INSTALLATION

INSTRUCTION

MANUAL

TABLE

CONTENTS

Description

Shipment

Inspection

upon

Receipt

Shipment

Storage

before

Installation

Basic

Accessories

Other

Available

Accessories

Present

Ratings

DST

Breakers

Uncrating

Setting

the

Main

Circuit

Breaker

Assembly

Checking

for

Proper

Contact

Adjustments

Arc

Chute

Installation

Inter

Phase

Barriers

Electrical

Operation

Check

Safety

Precautions

Installing

Circuit

Breaker

Cell

General

Information

and

Magnetic

Air

Circuit

Breakers

DST

Instructions

and

Adjustments

(

with

sketches

)

Method

Operation

and

Schematic

Diagram

Sources

Control

Coil

Data

Test

Data

DST

Air

Circuit

Breaker

Maintenance

Replacement

Solenoid

and

Shunt

Trip

Coils

(

with

photo

)

Recommended

List

Spare

Parts

Renewal

Parts

List

Renewal

Parts

List

ISKV

Courtesy of NationalSwitchgear.com

Each

circuit

breaker

its

crate

enclosed

poly

vinyl

dust

and

moisture

proof

envelope

which

zippered

three

(

)

sides

Within

this

envelope

proper

amount

silica

gel

absorb

moisture

recommended

that

this

envelope

not

opened

prior

putting

circuit

breaker

into

service

DESCRIPTION

The

DST

magnetic

air

circuit

breaker

electrically

operated

horizontal

drawout

three

pole

for

indoor

and

outdoor

metal

clad

switchgear

The

component

parts

are

mounted

welded

steel

frame

equipped

with

wheels

that

can

easily

moved

into

its

cell

has

insulated

interphase

bar

riers

and

steel

grounded

front

barrier

assure

safety

operating

personnel

breakers

are

stored

for

three

(

)

months

longer

silica

gel

should

removed

and

placed

dry

oven

remove

moisture

and

then

replaced

breaker

envelope

Primary

disconnecting

contacts

carry

the

load

current

and

secondary

disconnect

contacts

carry

the

control

circuits

for

operating

the

circuit

breaker

The

truck

mounted

breaker

interlocked

with

the

racking

mechanism

that

not

possible

rack

the

circuit

breaker

its

operating

position

when

the

circuit

breaker

closed

also

not

possible

rack

out

the

circuit

breaker

from

its

operating

position

when

the

circuit

breaker

closed

This

protection

accomplished

trip

lever

that

must

lifted

before

the

racking

crank

can

inserted

the

breaker

frame

These

magnetic

air

circuit

breakers

are

precision

jig

built

devices

and

are

factory

adjusted

and

tested

compliance

with

NEMA

standard

factory

operational

tests

Each

breaker

assigned

serial

number

and

careful

record

each

test

logged

This

serial

number

should

referred

becomes

necessary

contact

the

factory

concerning

breaker

each

breaker

carefully

factory

adjusted

before

shipped

field

adjustment

should

necessary

The

following

information

has

been

prepared

for

use

only

Federal

Pacific

Electric

field

service

per

sonnel

Should

become

necessary

consult

the

nearest

sales

office

for

field

service

assistance

SHIPMENT

All

circuit

breakers

are

assembled

the

factory

before

shipment

and

tested

for

operational

per

formance

Shipment

made

total

five

boxes

and

crates

The

basic

circuit

breaker

its

truck

one

crate

The

three

arc

chutes

are

packed

three

separate

boxes

The

interphase

barriers

are

packed

one

crate

For

circuit

breakers

interphase

barriers

are

inside

the

crate

identified

right

hand

and

left

hand

FIGURE

INSPECTION

UPON

RECEIPT

SHIPMENT

When

shipment

circuit

breakers

received

each

circuit

breaker

should

examined

before

removed

from

the

railroad

car

truck

any

damage

indi

cation

rough

handling

evident

description

the

condition

should

written

the

freight

bill

claim

should

filed

against

the

carrier

immediately

and

notice

the

extent

the

damage

sent

immediately

the

company

the

address

the

breaker

from

which

shipment

was

made

giving

serial

number

the

breaker

the

carrier

name

and

car

number

shipped

rail

This

information

enables

the

company

supply

needed

information

assist

the

purchaser

support

the

claim

The

serial

number

each

circuit

breaker

its

nameplate

and

also

marked

the

circuit

breaker

crate

The

two

crates

and

the

three

boxes

are

marked

with

the

factory

FED

number

copy

the

packing

list

enclosed

water

proof

envelope

nailed

the

outside

the

circuit

breaker

crate

One

envelope

only

furnished

with

orders

for

than

one

circuit

breaker

shipped

single

destination

Courtesy of NationalSwitchgear.com

GROUND

AND

TEST

DEVICES

STORAGE

BEFORE

INSTALLATION

Circuit

breakers

arriving

the

job

advance

installation

should

stored

indoors

dry

place

cases

where

anytime

elapse

before

the

circuit

breaker

installed

the

insulating

parts

should

tested

for

proper

insulation

level

standard

insulation

level

not

found

the

insulating

parts

should

dried

and

retested

stored

near

new

con

struction

work

care

should

taken

protect

from

dust

other

materials

covering

with

tarpaulin

Current

Rating

Symbol

1551

0314

1552

0314

1200

Manual

2000

Manual

1200

Manual

2000

Manual

Also

available

electrical

(

solenoid

operated

)

for

Specific

Applications

1551

0455

1552

0455

BASIC

ACCESSORIES

There

supplied

with

each

metal

clad

installation

one

the

following

Racking

crank

Manual

maintenance

closing

lever

Arc

chute

lifting

yoke

Test

jumper

(

optional

)

Breaker

handling

doily

(

not

illustrated

)

Breaker

transport

truck

(

not

illustrated

)

(

outdoor

installations

only

)

OTHER

AVAILABLE

BREAKER

ACCESSORIES

CLOSING

LOCKOUT

SWITCH

toggle

switch

momentary

switch

toggle

switch

momentary

switch

1551

0534

1551

0533

1551

0529

1551

0528

FIGURE

CINCINNATI

RECORDER

ATTACHMENT

Racking

crank

1551

1858

1551

0520

Pits

socket

upper

portion

mechanism

rack

the

breaker

from

disconnect

test

operate

position

the

cell

Shear

located

inside

sleeve

handle

protects

racking

mech

anism

from

overstress

INTERLOCK

ARRANGEMENT

(

Standard

Kirk

Type

)

LATCH

CHECK

SWITCH

1501

0240

1502

0240

Maintenance

closing

handle

1551

1726

Fits

socket

lower

front

portion

mechanism

breaker

for

maintenance

and

inspection

Must

not

used

breaker

manually

when

breaker

the

cell

MECHANISM

OPERATED

CELL

SWITCH

(

OPERATOR

)

1551

0636

1551

0635

Arc

chute

lifting

yoke

PADLOCK

ARRANGEMENT

Used

lift

arc

chutes

into

place

circuit

breaker

hoist

available

1551

0523

1551

0524

Test

jumper

REACTOR

TRIP

RELAY

ASSEMBLY

Connects

secondary

circuits

breaker

test

cabinet

plug

cell

for

testing

when

obser

vation

mechanism

contacts

desired

1551

0791

1551

0791

Courtesy of NationalSwitchgear.com

UNCRATING

RATINGS

DST

BREAKERS

the

breaker

has

moved

its

proper

location

lift

the

breaker

its

crate

possible

not

then

lift

the

breaker

without

its

arc

chutes

and

barrier

Always

remove

these

components

before

lifting

breaker

Fig

shows

proper

method

attaching

lifting

cable

Current

Rating

Type

Symbol

DST

150

DST

150

DST

250

DST

250

1200

1553

1653

1555

1653

1554

1653

1551

1653

1552

1653

1200

Uncrate

the

breaker

Use

nail

puller

for

this

purpose

Note

that

the

breaker

was

shipped

with

contacts

open

and

blocked

open

with

shipping

strut

2000

1200

2000

SETTING

THE

MAIN

CIRCUIT

BREAKER

ASSEMBLY

1200

Dummy

1551

0838

1552

0838

2000

After

the

breaker

uncrated

inspect

for

damage

DST

150

DST

250

DST

250

DST

500

DST

500

1200

1552

1655

1551

1655

1551

0606

1551

1655

1551

0606

Clean

off

any

accumulated

dust

with

dry

cloth

1200

The

contacts

were

not

oiled

greased

the

factory

nevertheless

see

that

they

are

free

from

any

oil

grease

2000

1200

2000

Check

for

any

obvious

loose

hardware

1200

Dummy

1551

1680

1552

1680

not

install

arc

chutes

and

barriers

until

ready

push

the

breaker

into

its

cell

2000

First

operate

the

breaker

means

its

maintenance

operating

handle

This

inserted

into

its

socket

lower

center

mechanism

See

figure

Push

the

handle

downward

the

breaker

until

audible

click

heard

indicating

that

the

breaker

has

latched

into

the

closed

position

Check

for

any

binding

friction

Remove

the

manual

closing

handle

Trip

the

breaker

raising

the

lift

trip

lever

Repeat

and

several

times

insure

proper

operation

Raise

the

lift

trip

lever

and

insert

the

racking

handle

socket

that

uncovered

the

pro

jection

the

trip

bar

Note

that

order

insert

handle

the

circuit

breaker

must

tripped

open

Turn

handle

rotate

racking

lever

against

roller

lever

against

the

step

the

extended

position

(

protruding

outside

the

frame

)

With

handle

still

the

socket

place

the

manual

closing

lever

manual

closing

socket

and

attempt

the

breaker

should

trip

free

Note

how

trip

bar

operates

the

cam

depress

the

trip

armature

circuit

breaker

does

not

operate

properly

check

the

contact

adjustments

follows

FIGURE

Courtesy of NationalSwitchgear.com

Arcing

Cortact

Position

CHECKING

FOR

PROPER

CONTACT

ADJUSTMENTS

breaker

manually

until

arcing

contacts

touch

(

Figure

)

Gap

main

contacts

(

)

should

approximately

bolt

handy

check

this

adjustment

Arcing

contacts

poles

should

touch

simul

taneously

within

Main

Contact

Penetration

breaker

fully

closed

position

(

Figure

)

Scribe

line

copper

contact

bar

immediately

opposite

edge

casting

(

)

and

(

)

Open

breaker

fully

and

again

scribe

lines

(

)

and

(

)

Arc

chute

installation

(

Figure

)

Lines

(

)

and

(

)

should

apart

Remove

from

crate

Clean

and

blow

out

with

dry

air

necessary

Inspect

for

damage

Broken

porcelain

plates

small

chips

not

objectionable

Broken

splitter

plates

small

chips

not

objectionable

Remove

two

loose

screws

(

)

from

side

contact

and

two

cap

screws

(

)

back

side

contact

hoist

available

remove

through

bolt

(

)

and

install

arc

chute

lifting

yoke

Lift

angle

shown

and

guide

beveled

end

(

)

into

hole

bracket

(

)

Fasten

bracket

(

)

contact

with

screws

(

)

Tilt

arc

chute

back

against

rest

frame

Remove

lifting

yoke

and

replace

bolt

(

)

i f

;

FIGURE

Courtesy of NationalSwitchgear.com

Tighten

two

lower

bolts

Check

closing

and

tripping

manually

Electrical

operation

check

(

May

done

before

installing

arc

chutes

and

barriers

power

available

)

Check

the

closing

and

tripping

voltages

the

nameplate

the

breaker

Breakers

used

with

capacitor

trip

devices

will

indicate

125

volts

for

tripping

Breakers

used

with

closing

rectifiers

will

indicate

125

volts

for

closing

Connect

breaker

suitable

supply

Connect

test

jumper

(

available

)

cell

test

cabinet

suitable

supply

not

available

the

breaker

must

electrically

operated

several

times

after

has

been

installed

the

cell

the

test

position

Before

doing

this

procedure

the

following

section

entitled

Installing

circuit

breaker

cell

sure

arc

chutes

and

interphase

barriers

are

installed

before

entering

breaker

cell

and

trip

the

breaker

electrically

several

times

insure

proper

operation

SAFETY

PRECAUTIONS

FIGURE

Before

placing

the

circuit

breaker

its

cell

make

sure

that

the

circuit

breaker

frame

will

ade

quately

grounded

the

ground

bus

the

cell

Arc

chute

installation

(

Figure

)

certain

arc

chutes

and

interphase

barriers

are

installed

before

entering

breaker

cell

Remove

bolt

(

)

from

front

upright

Making

sure

that

coil

leads

(

)

are

free

gently

lower

arc

chute

until

holes

line

for

bolt

(

)

Install

bolt

(

)

and

tighten

This

makes

mechanical

and

electrical

connection

this

point

Tighten

screws

(

)

each

side

bracket

Fasten

both

coil

leads

(

)

with

screws

(

)

removed

step

Note

These

leads

are

parallel

Other

end

coil

connected

internally

arc

runner

Check

operation

breaker

manually

for

any

rubbing

etc

Check

all

main

connections

and

contacts

from

bus

breaker

and

from

breaker

line

Examine

cell

secondary

contact

connections

Make

sure

that

phasing

correct

particularly

line

feeds

power

into

the

breaker

This

extremely

important

the

breaker

controls

the

output

generator

synchronous

motor

would

advisable

clean

the

circuit

breaker

with

dry

compressed

air

hose

INSTALLATION

INTERPHASE

BARRIER

The

upper

part

the

breaker

above

the

mechanism

section

normally

enclosed

the

interphase

and

front

barriers

and

the

operator

protected

from

contact

with

live

parts

not

move

the

circuit

breaker

into

the

cell

unless

the

barriers

and

arc

chutes

are

place

however

necessary

examine

the

action

the

contacts

etc

with

the

breaker

the

cell

the

front

barrier

may

removed

but

only

the

disconnect

the

test

position

Never

push

the

breaker

the

operating

position

until

all

barriers

are

place

that

position

the

breaker

live

whether

closed

open

Remove

from

crate

Wipe

off

dust

with

dry

cloth

Inspect

for

damage

Remove

two

inch

bolts

front

brace

breaker

frame

Slide

the

barrier

assembly

Into

place

the

breaker

Make

sure

the

outside

sheets

slip

inside

tne

frame

gusset

See

Figure

Note

breakers

slide

right

half

barrier

assembly

into

place

first

then

left

half

Install

inch

bolt

top

Courtesy of NationalSwitchgear.com

matically

pushed

toward

the

operator

and

locked

its

operate

position

The

breaker

now

the

operating

position

Remove

the

racking

handle

not

attempt

the

circuit

breaker

hand

against

energized

circuit

The

maintenance

operating

handle

should

only

used

testing

the

mechanical

operation

the

circuit

breaker

when

not

the

cell

The

circuit

breaker

ready

for

service

and

should

closed

and

tripped

electrically

several

times

assure

that

all

control

circuit

connections

and

contacts

are

satisfactory

This

should

done

dead

bus

possible

the

test

must

made

live

bus

first

read

carefully

the

preceding

section

entitled

Safety

Precautions

order

that

sufficient

closing

force

and

acceleration

are

attained

the

circuit

breakers

should

closed

electrically

from

adequate

power

source

See

NEMA

Standard

213

Remove

the

circuit

breaker

from

the

cell

when

examined

for

maintenance

repair

and

fasten

the

cell

door

breaker

tested

live

bus

When

testing

the

circuit

breaker

make

sure

the

circuit

breaker

control

switch

has

not

operate

tag

When

desired

rack

the

breaker

into

the

Test

position

first

trip

the

breaker

electrically

operating

control

switch

then

insert

racking

handle

INSTALLING

CIRCUIT

BREAKER

CELL

Before

placing

the

circuit

breaker

the

ceil

proceed

follows

Before

shipment

the

circuit

breaker

closing

relays

the

top

the

cells

are

blocked

Remove

these

blocks

thus

allowing

the

relays

operate

Rotate

the

racking

handle

counter

clock

wise

eleven

(

)

times

Shutter

will

and

secondary

contacts

will

disconnected

Remove

the

racking

handle

See

that

the

secondary

sliding

panel

with

its

plug

block

held

the

front

the

mechanism

housing

its

lock

operate

Test

position

release

secondary

contact

lock

and

push

sliding

panel

forward

until

its

contacts

engage

contacts

the

cell

The

breaker

can

now

operated

electrically

the

Test

position

Insert

racking

handle

Rotate

handle

counter

clockwise

until

lever

and

roller

assembly

against

its

stop

This

assembly

the

rear

the

breaker

top

the

mechanism

housing

Racking

lever

should

protrude

outside

the

frame

before

placing

breaker

frame

Insert

the

racking

handle

The

circuit

breaker

can

racked

the

disconnect

position

rotating

the

racking

handle

counter

clock

six

(

)

times

The

secondary

contact

sliding

panel

should

pulled

forward

its

operating

position

and

locked

there

its

lockpin

otherwise

there

will

voltage

the

control

wiring

the

circuit

breaker

Place

breaker

its

cell

and

push

until

lever

and

roller

assembly

hits

against

horizontal

racking

hook

which

mounting

rear

cell

Rotate

racking

handle

clockwise

six

(

)

turns

Circuit

breaker

will

first

back

out

little

and

then

forward

Test

position

shown

the

indicators

the

right

hand

side

sheet

Note

stated

previously

under

Description

the

circuit

breaker

has

open

before

the

operator

can

insert

the

racking

handle

into

its

socket

Therefore

impossible

rack

closed

circuit

breaker

from

Test

operating

position

from

operating

test

position

Remove

racking

handle

operate

breaker

Test

position

release

secondary

contact

lock

and

push

sliding

panel

forward

until

its

contacts

engage

similar

contacts

the

cell

plug

block

The

breaker

can

now

closed

and

tripped

electrically

several

times

test

the

control

circuits

GENERAL

INFORMATION

AND

MAGNETIC

AIR

CIRCUIT

BREAKERS

Insert

the

racking

handle

BREAKER

Deod

Front

Figure

The

breaker

now

open

Rotate

racking

handle

eleven

(

)

times

clockwise

The

shutter

will

driven

open

shown

its

indicator

The

secondary

contact

sliding

panel

will

auto

Note

breaker

has

front

steel

plate

that

closes

against

angle

irons

switchgear

cell

making

completely

dead

front

arrangement

Courtesy of NationalSwitchgear.com

FIGURE

BREAKER

FRAME

Figures

Breaker

frame

welded

fabricated

assembly

and

”

thick

steel

very

amply

braced

Four

inch

diameter

wheels

provide

ease

withdrawal

Breaker

position

indicator

mechanically

locked

with

“

breaker

operating

mechanism

”

provides

positive

visual

indication

contact

position

Veeder

counter

supplied

record

number

oper

ations

GROUNDING

Figure

(

)

Breaker

frame

substantially

grounded

both

“

operating

”

and

“

test

”

positions

copper

bar

solidly

bolted

breaker

frame

provides

wiping

action

against

stationary

coil

spring

loaded

contact

located

cell

and

formed

”

copper

FIGURE

Courtesy of NationalSwitchgear.com

FIGURE

PRIMARY

DISCONNECTS

Figure

Primary

disconnects

are

self

aligning

and

consists

high

pressure

finger

segments

extruded

copper

heavily

silver

plated

Pressure

exerted

each

finger

individual

leaf

spring

single

brass

retaining

ring

encircles

the

cluster

fingers

The

disconnects

are

located

the

breaker

(

not

the

cell

)

for

convenient

inspection

and

maintenance

when

breaker

withdrawn

from

the

housing

SECONDARY

DISCONNECTS

Figures

Secondary

disconnect

contact

assembly

may

(

)

locked

place

with

disconnect

simulta

neously

with

main

contacts

(

)

unlocked

remain

connected

with

breaker

“

test

position

FIGURE

CLOSING

SOLENOID

Figure

Secondary

contacts

may

readily

engaged

from

front

breaker

before

breaker

placed

“

operating

position

Note

the

closing

solenoid

plunger

disc

points

near

the

closing

stroke

(

)

Breaker

contacts

are

closing

against

considerable

spring

pressure

and

(

)

The

breaker

may

required

against

fault

currents

within

its

full

capability

which

creates

great

mechanical

forces

tending

open

the

breaker

The

plunger

disc

gives

the

solenoid

additional

pull

and

“

zip

the

end

the

stroke

Horizontal

travel

contacts

considerably

exceeds

exact

distance

from

“

operating

“

test

position

which

eliminates

any

critical

adjustment

contact

movement

“

RACKING

”

Figures

The

“

racking

device

simple

positive

sturdy

Only

two

moving

parts

(

)

Horizontal

shaft

manual

crank

one

end

;

worm

gear

opposite

end

(

)

Horizontally

rotating

lever

with

cam

roller

and

spur

gear

Requires

only

17.5

turns

for

full

travel

lever

cam

Breaker

“

test

position

(

clearly

indicated

cell

)

before

lever

cam

rotates

end

travel

This

means

breaker

firmly

locked

cell

“

test

position

INTERLOCKING

Figures

FIGURE

Simple

positive

interlock

bar

that

Courtesy of NationalSwitchgear.com

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