GE AKR-4-50, AKR-4-30, AKR-4-50H, AKR-5-50, AKRT-4-50 Maintenance Manual Supplement

MAINTENANCE

(SUPPLEMENT)

MANUAL

(Supplement

GEI-86134D

to GEK-731

0)

POWENCINCuIT

TYPE

This manual when used in conjunction with Publication

tenance

tenance Table

1.

Manual

instructions on

for AKR-3/3A-50

the AKR breaker models

AKRU-3A-50

and

AKR

breakers)

and trip

GEK-7310

provides

devices

BNEAKENS

(Main-

main-

listed in

Frame

Size (Amp)

800

1600

2000

*

Integrally

-

Breaker

Stationarv

AKR-4-30, AKR-5-30, 30H

AKR-4-50, AKR-5-50,

AKRT-4-50

AKRT.5-50

fused

30H

50H 50H

types

IAB]T I

Type & Mounting

Drawout

AKR-4A-30, AKR-5A-30.

AKRU-4A-30* AKRU-5A-30*

AKR-4A-50, AKR-5A-50.

AKRU-4A'-50*

AKRU-5A-50* AKRT-4A-50 AKRT-5A-50 X

Trip Device

ECS

3OH

30H

50H 50H

Type

ssr

X

x

X

x

GENERAL

@

ETECTRIC

Introduction

CONTENTS

Constructional Diff

erences.

.

Breaker Ratings

Drawout Breaker Interchangeability

Breaker

Maintenance

. .

Precautions

Manual Handle

Adjustment

ContactMaintenance. . . .

Contact

Adjustment:

AKR.3O,

AKR-50,

-30H,

-50H,

AKRU-30

AKRU-50

.

AKRT-50

Contact Replacement:

AKR-30,

-30H,

AKRU-30

.

AKR-50, -50H, AKRU-50, AKRT-50. .

FusedBreakersAKRu-30,

-50

......

FuseSizesandMountinC....

Special

Open

Type SST

2500A

Fuse

Overcurrent

Fuse.

Lockout Device 12

Trip Device t4

Components 14

TripCharacteristies ......16

Troubleshooting. 77

Test Set TAK-TS1.

SST

False Tripping

Replacement of

(Ground

Current

Flux Shift Trip Device

Cabling Ground

Diagrams. 22

Fault Defeat

. .

.

Fault)

Sensors 19

Cable

. .

6 o 6

o

7

I

8

10

10 10 72

18 19

20

23

Type ECS

Overcurrent

Components TripCharacteristics .,,,..25

Cabling

ECS

& SST Time-Current

fhese inslruclions do nol

with instollolion,

lhe purchoser's purposes,

for

operolion

purporl

lo

oll

cover

or moinlenonce.

lhe

moller should 6e referred lo lhe

detoils or voriations in

Should further informolion

Trip Device 24

24

Diagram 26

Curves

eguipmenl

be desired or should

Generol Eleclric Compony.

nor to provide for

every

porliculor problems

27

possrble

conlngency lo be mel in conneclion

orue whrch

nol covered

ore

sufticienlly

Power Circuit

Breokers,

GEI-86134

MAINTENANCE

LOW.VOLTAGE

INTRODUCTION

The data in this supplement

800A

oreakers not coveredby the

maintenance manual

formation

devices

1600A frame AKR-50 design.

c i-f ic const ructional di-f

basic AKR-50 framework,

devices Except

the

Accordingly,

now

new types.

the

to that

to the

AKR-30 and

the

on

also is included.

new

The

breaker models

are substantially

for the

external

in

scope

descriptive

new models.

Hx W xD dimensions

a majority

publication

Therefore, to

of this supplement

or otherwise discussed

continue to

erational

employ

information source.

the

2000A

existing

(publication

new

ECS and SST solid-state

f

rence

e

mechanism

common

800A

frame

of the

GEK-7310 applies

avoidneedless repetition,

and instructional material

Unless

herein,

GEK-73i0 as

MANUAT

SUPPLEMENT

POWER CIRCUIT BREAKERS

TYPES AKR/AKRU.3OI50, AKRT.sO PER TABLE

pertains

AKRT-5O

GEK-7310).

derivatives

are

Apart f rom the

s identi-f ied bel

primary

AKR-50

is

confined

noted

the user

the

to

the new

f rame

AKR/AKRU-50

In-

trip

the

of

spe-

the

ow,

and accessory

to all versions.

details,

stud

are identical.

in-formation

equally to the

principally

unique

to the contrary,

should

general.

op-

AKR-30H.

cauons

a.

b. c.

d.

ln rne rollowlng

quenchers.

Arc

Closing

insulation

Extra Mounts one

for

total

a

ture is

NOTE:

AKR-30,

qttencher

red.

Same as

springs.

additional

four:

of

same as

To

uisibly disti.ngtdslt i,t

tlte clositzg springs and at,c

couers

I

the

AKR-30

areas:

sha-ft flyweights.

on

stationary main

otherwise

AKR-30.

of

See Fie.

tlte 30H are colored

except for

the

contact struc-

6.

ft,ont

modifi-

contact

tlte

Complementing

supplernent

pand

and update

where

operating

tion

appropriate.

handle

of the AKRU-5O

includes

the

above

additional

existing

Examples

adjustment

minimum

to 450A.

CONSTRUCTIONAL

features

The

AKRT

are

refer to

AKR-30.

a.

b.

c.

breakersfromthe

listed

below.

"Renewal

entirely

An

employs three

arcingand onemovablecontact

Primary studs

poie.

Two

of

See Fig. 1.

additional opening springs,

the

main shaft.

which distinguish

parent

For

detailed

a

Parts Bulletin"

new contact structure.

stationary mains, two

carry four disconnect fingers

See Fig. 4.

"new"

information to

GEK-7310

are revision

procedure

fuse

DIFFERENCES

AKR-50

parts

GEF-452?.

arm. See Fig.

material,

subject-matter

and reduc-

size from 8004.

the

new

frame

comparison,

Each stationary

one

at

this

ex-

of the

AKR/

size

pole

per

each end

5.

Fig, 1.

Rea?'

uiew

AKR-50

of

breaker

GEI-86134,

Power

Circuit

Breokers

AKR-5OH.

?ffiEs

springs

closing

the

attaine$-by

and

springs

AKR-30H.

AKRT-50.

AEF-:$;-

a.

New

and larger

contact

b.

Stationary otherwise

to the

AKR-50.

An

added

A

M

o dif i

arms

the

AKR-50

currry

20004

cations

upper

and

main

stationary

See

with

extended

special

arc

insulation.

the

same

extension

ar e

:

stud

pivot

block.

contacts

Frame

Size

(Amperes)

Figs.

increased

contacts

g

short

quenchers, euencher

red

color

the

of

1600A

assembly,

from

are

and 9.

Breal<er

Type

circuit

closing

tops

and

used

frame

movable

6 to

identicai

TABI.T

BREAKTR

Rated

Maximum Voltage

(60H2

--

AKR

800,

on

present of the

carries

current.sensor

trip

device

EXAMPLE:

sensor

g;

Short

voltage..

upon

an instantaneous

2

RAIIIIGS

3{

(kA

Instantaneous

ac)

BREAKER

breakers

1600

and

the

maximum

respective

a specificrating

€rmpere

with

which

An

tap

set

on

cir

cuit

ratings

OTZ

whether

Short

RMS Sym)

V

!

the

Circuit

with Trip

RATINGS

a.reavailable

2000

amperes.

continuous

frames.

whichis

rating(or

it

is

AKR-5A-3O

1004

is rated

vary

systems

overcurrent

trip

element.

Rating

Without

Instantaneous

Trip

inthree

These

current

However,

determined

tap

equipped.

breaker

100A.

with

the

they

are

trip

See

frame

sizes

values

capability

each

breaker

by

setting)

applied

with

system

of tt"

SST

atso Oependent

device

lante

contains

Z.

re_

the

800

1600

2000

800

1600

AKR-30

AKR-3OH

AKR-50

AKR-5OH

AKRT.SO

AKRU-30

AKRU

-50

508

254

635

508

254

635

508

254

635

508

254

635

508

254

600

635

42

50

65

200

42

50

65

50

65 65

30

42

42 42 50

30

42 42 42

42 50 50

50

65

42

50 50

200

Power Circuil

Breakers,

GEI-86134

DRAWOUT

INTERCHANGEABILITY

general,

In

rating are

and

compartments

sizes are

the wrong

suitable breaker

typical

jection wrong

rejection

type breaker

drarvout

interchangeable

drawout breakers

;

interchangeable.

not

breaker

type

"rejection

its compartment.

and

in the

the bracket and

breaker

of

cuit ratings

onlv:

.f r(

from seating

There

the same

ilil

ill

is one

frame

may be interchanged

]l

ill ltl ilt lll

T-n-

AKR.30

o

sa1

'il_

ttt ltl

ilr

tl

|ll

ll| ilT

uu

AKR-3OH

(?

n^<

il ltl

lrlr-

tl atl tt ttl

T-T

AKRU.30

(c,

breakers

into a

hardware"

bracket

drawout

is inserted

do not mate,

itself

exception

size having

ffihffi

z

UJ

F-

F2

<x

o

n

v

II TI

ffil--c I

+-il1'-' i"oJ'JT,rn

T----l;l*A

BREAKER

the same

of

their equipment

in

diJf er

of

prevent inserting

To

drawout

is a-ffixed

Figure

which aligns

(Fig.

rail

into

a

the drawout

into

to the above.

different short

in

-

AKRU

50

(6)

type

fr

ent

ame

compartment,

to each

4 shows a

with a

3). When

compartment

preventing the

one

RE.JECTION

PINS IN SLIDE

LS

RAI

REJECTION

BRACKETS

MOUNTED BREAK ER

J

re-

the

rails.

Breakers

cir-

direction

R IGHT

SLIDE RAIL

ON

neuecrroru

PosrrroNs

a.

An

AKR-3OH

compartment.

b.

An AKR-50H

compartment.

rejection

The

and b.

a.

Figure

combinations

tended breaker

2

its rejection

positions rail(s) . Referring

the

each

single

fused breakers

nonfused breakers

as a

type(s) ment.

AKRT.50

@

(A,

AKR-30H

slide rail.

in the right side

guide

that will be accepted

PLAN VIEWS

-

can be

can be inserted into

hardware

shows

employed.

type,

(or

B or C

to

50H types employtwopins, one

and

inserted into

prevents

the rejection

As determined by its in-

drawout c

each

pins)

installed in one of

the

ompartment

front-to-rear) along

5, note that only

Views

2 and

The other breaker

AKRU-3O ard 50

TaiL

use a single bracket,

carry two brackets. Use

determining the

for

-

KrtJn I sluE

by any

proper

given

an

AKR-30

an

AKR-50

converse

and bracket

has

three

the

slide

types use a

whereas

Fig.

breaker

compart-

ffi

IN

of

in

a-ll

2

Fig.

2. Non-interchangeabi,lity

hardware arrangements compartments

AKR

-30/s0H/50/50H,

AKRU-30/50

breaker Types

for

AKRT

(rej

ec ti.on)

i.n drawout

-50

and

Fig. 3. Slide rail rejection

pi.n

locations

GEI-86134,

Power

Circuil Breokers

BREAKER MAINTENANCE

SAFETY PRECAUTIONS

BEFORE INSPECTING

ANY XMINTENANCE WORK

BREAKER, I7: MUST BE DISCONNECTED

FROM

POWER AND CONTROL, AND BE IN

THE

MANUAT

On

springs may be charged

gree

clockwise handle

strokes

procedures

stroke method. By

operation

Referring

handle adjustment is

The length of

double-ended

mid-stud can be

When looking

wrench clockwise

motion

degrees.

wrench stroke imparts 15 degrees movement. best setting is approximately mid-range.

ALL VOLTAGE

'IOPEN"

HANDTE ADJUST'NENT

manually

lesser

of

should

is

assured.

shortens it. The

In

POSITION,

operate d AKR

-

swing. The following

be

so

to Fig.

this link is

stud in its center.

engaged by an open-end wrench.

down

on the breaker, turning the

lengthens

the

confined space available,

stroke

performed

doing, proper

13

made

OR BEGINNING

ON THE

SOURCES, BOTH

bre ake rs, the closin

ei.ther by a single

to four

or up

adjustment

using the single-

multi-stroke

of GEK-?310,

via adjustable

controlled

the

link.

range

of adjustment

the manual

by turning

A hex

section in

The opposite

135

multiple

link

is 300

de-

(16).

each

The

link

If the

extend the closing spring

center.

is too long, the handle

this

In

to complete the

then

be closed and opened

shortening of the link.

link

If the

possible.

not charge the springs.

is too short,

However, more than

CONTACT MAINTENANCE

Breakers subjected to frequent

high currents may

g

of their contacts.

need

of replacenrent

the mass

of

light

or

cate

loss

When contacts are replaced,

justed

developed

tacts

a

when the

the

"wipe"

throughwhich

breaker closes.

contact

of

is open,

breaker

greater

of the contacttip material. Roughening

pitting

of

of ability

to ensure that the

between

breaker is

adjustment.

the stationarycontacts

on a stationary

the position

and

is closed. The

because

imparts a sliding

tacts.

Fig. 4.

event, use the maintenance

spring charging.

AKR-SA-30

1.

Opening

2.

Rejection

enough

for

preparatory

one-stroke

spring

bracket

stroke cannot

it to

The breaker can

to further

charging

one stroke will

interruption

eventually require

generalrule

The

the loss

is

the contact

to carry

surface does not

or interrupt

proper

movable

the

closed.

"Wipe"

It is measured

contact when the

of the same point

actual wiping motion

the contacts

or

"scrubbing"

over-travel.

ofone-haLf or more

a:nount

and

replacement

for

determining

they

must be ad-

of

stahonary

This

is called

the distance

is

move when

between

action to the

the

when the

"Wiping"

bt,eaher

go

over

handle

indi-

current.

force

con-

the

point

breaker

is

con-

is

of

is

Power

Circuil Breokers,

GEI-86134

Movable contact arm

1.

2. Stationary

Stationary arcing

3.

4.

Contact

main contact

contact

spring

5. Arc runner

Fig.

The wipe adjustment influence s

fer during

the

of

arc is its

the intermediate contacts the

arc runner andfinallyto the arcquencher

dissipated

it is

that contact wipe be

normal maintenance

CAUTION:

FOLLOWING

AND

ICALLY

SPI1/NG

SIIAFT.

,,SLOW-CLOSEDI'

NANCE HANDLE.

CONTACT

The

frame

ficantly

pole

against five as shown

AKR

consists

AKR/AKRU-S} contact

5.

(arc quencher

interruption of

forced

andextinguished.

inspections.

BEFORE

remoued)

fault

currents

sequential

to

the arcing contacts to

checked

DOING ANY OF THE

CONTACT ADJUSTMENT

REPLACEMBNT

DISCONNECT THE CLOSING

WORK,

FROM THE MECHANISM

BREAKER CAN

THE

USING

ADJUSITilENT Types

contact

from

in Fig. 5.

arrangement

and AKRU-3O

that

of the AKR-50

of a

single

stationary

contacts,

Proceedingfrom

movable

THE

ond

AKRU-3O

of

breakers dilfers

proper

Itis recommended

periodically during

AKR-3O, 3OH

the 800

frame size.

contact arm

arranged vertically

structure

arc trans

Transfer'

.

"

movement from

where

MECHAN-

CAM

NOW BE

MAINTE-

ampere

signi-

Each

acting

top to

bottom,

1. Movable

2. Stationary

Stationary arcing

3.

Fig.

-

the first two contacts serve as

'

the bottom

and

intermediate

The contact assembly

employs

adds a See

plicable

the

fourth stationarv main

Fig.

following

The

to all

1. Open

2.

Arrange

scribed

on

3. Using

slow-close the

4.

Se1ect one

gage,

measure the

pivot

its

adjust wipe

the

adjustment stud.

5. Repeat this Trip the

6.

AKR-S1H contact structure

6.

three

are

contacts.

AKR/AKRU-30

same

6.

wipe

AKR-30

the breaker, remove

the

page

stud as shown

gap

breaker for

15

of

the

ratcheting maintenance handle,

breaker.

pole

and,

gap

to

0.060 *

procedure

breaker.

contact

the mains.

for

adjustment

types:

GEK-?310.

using a flat or wire feeler

between

in Fig.

arm

main

contact

the

arcing

the AKR-30H

configuration,

contact at the

procedure

arc

slow-closing

the top contact

As necessary,

?.

contacts

There are no

breaker

bottom.

quenchers.

0.020 inch by turning the

the other two

on

but

is

ap-

as de-

and

poles.

GEI-86134,

Power Circuit

Breokers

ADJUST

0.060"

WITH

PIVOT

STUD

STATIONARY CONTACT

Fig.

7. AKR-30

top

CONTACT ADJUSTMENT Types AKR-SO, sOH

Use the

justment:

1.

follorving procedure

Open the breaker,

wipe

of breaker

adjustment

qnd

remove arc

2. Arrange the breaker forslow-closing,

page

scribed on

Select one

3.

sheet or

myl.ar,

strip of

over

contacts.

wide and must

contacts from making contact closed.

4.

Using

slow-close the breaker with the insulation held in

place.

"over-hangs"

Examine

5. Atiach

between

stud

main

the upper

Facing the

6.

clockwise until the checker

contacts

fits the hex section on

?. Turn

contacts

clockwise 270

just

From this

8.

Trip the breaker,

9.

15

of

GEK-7310.

pole

tough

the

stationary arcing and

This strip

prevent

the

of

breakerand

insulating

should be about

the

arcing and intermediate

the ratcheting maintenance

the

insulation to make

the intermediate

below

continuity

a

have

the

stud

touch.

degrees.

and

breaker,

point,

checker

lower stud.

turn

parted. An

the

stud.

counterclockwiseuntil

advance the stud

This will be

remove the insulating strips.

GAP TO

o.oeo'

t.

BREAKER

AKRU-SO

toper{orm

material,

when

CLOSED

uieoo

-

quenchers.

the

from

wipe ad-

as de-

place

such

intermediate

two

inches

breaker is

handle,

a

thin

sure it

contacts

(bell-set

the wipe adjustment

indicates

open-end

.

light)

or

that the

wrench

the main

counter-

4-1/2 flats.

CONTACT

The contact structure of this 2000A

conceptually identical to the

that it

stead of six.

stud

block

9.

and

The

to

a

threaded

ADJUST|YIENT

employs

assembly,

are

two movable

eight stationary main contacts in-

Constructionally,

movable

unique to the

metal driving

screws

and

link. This arrangement omits

wipe

adjustment

frames.

-50

the

driving link

then rotating it

the

On wipe exists if tionary main contacts have moved

stops.

removing the

verifying

and

are

"lifted

appear

1.

as

2.

scribed on

3.

detach the drivinE

and

tact

4.

sulating

5.

turns.

sary

contact

AKRT-50

This

necessary,

Open

Arrange the breaker for

Selecting one

arms.

Screw

link.

Back out

Exceed this by whatever

properlypositionthe

to

arms.

6. Install the coupling ?.

Using

breaker

contacts move

dition is

move the an additional half

wipe.

and observe

not

coupling

8.

Reassemble,

stud

Instead,

from the

respect to the insulating

with

closed

on a

,

condition can be checked visually by

quenchers,

arc

that

all

their

off"

stops.

proceed

the breaker.

page

15 of

pole,

the driving link completely into the

the driving

the maintenance handle,

from

away

achieved, open the

turn.

reclose thebreaker

lype

AKRT-50

breaker

1600A

AKR-50

however,

the upper

contact arms and

AKRT-50.

contact arms are

link whose

directly

the

provided

wipe is

movable contact

proper

the

on

adjusted

breaker,

See Figs.

pin-coupled

opposite

the insulating

into

wrench-operated

the

AKR-30

by detaching

arms and

amount of

of the sta-

aII

from their

away

closing the breaker

eightstationary

Should wipe adjustment

follows:

as

GEK-7310.

dri-ft

from the movable con-

link

tink two

main

slow-closing as

the

out

coupling

and one-half

amount

is neces-

linkwithin the movable

and retainer

that

eight stationary main

all

their stops.

breaker,

and back out the driving

rings.

slow-close the

this

If

againre-

and

is

except

pivot

8

end is

and

link.

contact

contacts

de-

in-

con-

link

recheck

Repeatthe above

10.

poles.

8

procedure

on

the

other

two

9.

poles.

Repeat

the

above

procedure

on

the

other two

Power

Circuif

Breokers,

GEI-86134

Fi,g.

7

AKRT-5)

8.

contact

structure

Movable

1.

StationarY

2.

3. Stationary

4. StationarY

5. Driving

Insulating

6.

I 7. CouPling

contact

arm

contact

main intermediate arcing

link

contact

Fig.

AKRT-|7

9.

Mouable

contact

piuot

DRIVING

LINK

bloch

GEI-86134, Power Circvil Breokers

CONTACT

The

AKR-30

fashion main however, runner

Replacement of

is

accomplished

AKR-50

coupling

CONTACT

Referring

tacts

(5)

andthe

bling, make sure that the

ends of

',vashers

screws are

Intermediate

moved

pieces

serting a spring

puII

Replace the contact by holding it in

end behind

engaging

REPIACEIVIENf Types

stationary contacts

breaker

to that

frames

employed for the intermediate

stationary contacts

necessary

it is

AKR-30, 3OH

ond

AKRU-3O

(arcing

and

are replaced in

the AKR-50.

of

to first remove the

by removing its three holding screws.

the

single movable

in

like marurer

breakers, i.e., pin, pivot pin,

REPTACEMENT Types AKR-SO,

to

(L)

are released by removing the

Fig. 17 of

arcingcontact

remove

etc.,

AKRU-50

pivot (6).

employed for the

described

as

GEK-?310,

insulating spacers on

the arcing

(B)

replaced.

contact

under the

(2)

disconnecting their

by

on the

springs

puller.

the spring and lift it off

the

contact stop) while extending and

the

spring on

pin (7)

and the insulating

lower arc runner

main

and

contacts

springs. The end

(9)

have

While holding the contact,

the

small hole for

a

the

end of

end. A suitable

outer

mains)of the

identical

and

do

To

so,

arc

contact

replace

and

50H,

ond

AKRT-SO

arcing

arc

When reassem-

(3)

arm

the

below.

con-

runner

the

fastening

re-

are

in-

the

contact.

position

(inner

puller

end of a

by drifting

sulated coupling

are

tainer

can be fashioned

length

The

two movable contact

needed to

on

of. 1/76-tnch diameter

out

remove and

the

end of

(10)

(11).

the pin.

by forming

arms

connecting

Right angle tru-arc pliers

replace the

Next, remove the fastening

pivot

springs

and

from the

replacing the arms ensure that

and washers

Tighten

AKRU-3O ond

the

Except

for

returned totheir

are

two

bolts in the contact

-50 FUSED BREAKERS

the

open

fuse

integrally-mounted fuses

AKRU-30 and

fused

AKR-30

devices

Fuse Sizes

are

ond Mounting

Table 3 lists

for thesebreakers.

as shown

which has

fuse

Class J

mounting hole

in

a

tang has

breakers

-50

and

the

-50

same

for

the range

TheClass L

Fig. 10.

two

holes sized

per

mounting

targ. The 300, 350

single

fuses rated

models.

both types.

Other

300 thru 6004.

sizes require copper adapter bars

pivot

all spacers, springs

lockout device

on the

identical to the

are

fuse

of

than the

hole

for

one-half

a hook

steel

(4)

are removed

them to

on the

wire.

the in-

tru-arc

screws, washers,

below. When

original

arm

position.

pivot.

and

upper studs,

un-

Overcurrent

sizes

fuses

are

800A

per

tang, each

inch bolts.

per

Fig.

trip

available

mounted

size,

have

one

400A

and

11.

re-

the

L

10

NEMA

Fuse

Class

600v

60

Hz

J

L

Special

xMounting

GT

Breaker

Type

AKRU.

-5dl5o--

ii

L 2500

adapter

required

CIT

IABIE

TOR ATRU BREAI(ERS

rusTS

Ampere

Rating

300x

3 50*

400x

450

500

6no

800 1000 1200

1600

2000

-

see Fig.

3

Cat.

No.

GFSB3OO

350

400

450

500

600 800

.

1000 1200 1600 2000

GFgF2SOOAK

11

Melting

Tine-

current

Curves

8004

GES

I I

I

V

GES-8005

I I I

I

V

r.838?832

GE AKR-4-50, AKR-4-30, AKR-4-50H, AKR-5-50, AKRT-4-50 Maintenance Manual Supplement

Specifications and Main Features

Frequently Asked Questions

User Manual