GE AK-4-75 User manual

MAINTENANCE

MANUAL

(

SUPPLEMENT

)

LOW

VOLTAGE

POWER

CIRCUIT

BREAKERS

labl

135

Supplement

GEK

7303

This

manual

when

used

conjunction

with

Publication

GEK

7303

(

Maintenance

Manual

for

the

100

frame

breakers

)

provides

maintenance

instructions

the

breaker

models

and

trip

devices

tabu

lated

below

Breaker

Type

Mounting

Trip

Device

Type

Frame

Size

(

Amp

)

ECS

SST

Stationary

Drawout

3000

100

4000

100

”

Rear

View

•

GENERAL

ELECTRIC

Courtesy of NationalSwitchgear.com

PUSH

RESET

SHORT

TIME

NST

PICKUP

GROUND

FIG

SST

Programmer

Unit

CONTENTS

Introduction

Type

SST

Overcurrent

Trip

Device

Components

Trip

Characteristics

Flux

Shift

Trip

Device

Troubleshooting

SST

Test

Set

TAK

False

Tripping

(

Ground

Fault

)

...

Replacement

Current

Sensors

Cabling

Diagrams

Ground

Fault

Defeat

Cable

1 1

Type

ECS

Overcurrent

Trip

Device

Components

Trip

Characteristics

Cabling

Diagram

ECS

SST

Time

Current

Curves

Courtesy of NationalSwitchgear.com

MAINTENANCE

MANUAL

SUPPLEMENT

LOW

VOLTAGE

POWER

CIRCUIT

BREAKERS

TYPES

100

WITH

ECS

AND

SST

TRIP

DEVICES

INTRODUCTION

TYPE

SST

OVERCURRENT

TRIP

DEVICE

The

SST

solid

state

direct

acting

self

pow

ered

trip

device

system

Referring

Figures

through

comprises

the

following

individual

com

ponents

Programmer

Unit

—

provides

the

comparison

basis

for

overcurrent

detection

and

delivers

the

energy

necessary

trip

the

breaker

Contains

the

electronic

circuitry

for

the

various

trip

elements

Their

associ

ated

pickup

and

time

delay

adjustments

(

set

points

)

are

located

the

face

plate

Depending

the

plication

programmer

units

may

equipped

with

various

combinations

Long

Time

Short

Time

stantaneous

and

Ground

Fault

trip

elements

See

Table

for

available

ratings

settings

and

trip

char

acteristics

The

data

this

supplement

pertain

and

100

frame

breakers

equipped

with

type

ECS

and

SST

solid

state

trip

devices

The

latter

are

not

treated

the

primary

maintenance

manual

(

publica

tion

GEK

7303

)

covering

these

breaker

frame

sizes

scope

this

supplement

supplies

the

essential

descriptive

and

instructional

material

applicable

the

new

trip

devices

Although

breakers

equipped

carry

new

type

designations

(

and

)

the

basic

breakers

and

their

other

accessory

devices

are

identical

those

equipped

with

Power

Sensor

trip

devices

Accordingly

the

general

operational

and

maintenance

information

contained

publication

GEK

7303

equally

relevant

ECS

SST

equipped

breakers

and

not

duplicated

here

the

event

that

programner

set

knob

Note

left

untightened

the

trip

function

reverts

operation

its

minimum

maximum

set

point

value

follows

Unless

otherwise

noted

the

contents

this

sup

plement

are

interpreted

applicable

both

the

and

100

frames

Except

for

the

pro

grammer

and

sensor

differences

noted

below

the

hardware

elements

(

cabling

flux

shift

trip

actua

tors

and

linkage

)

and

the

test

adjustment

procedures

are

identical

Pickup

Delay

Trip

Element

Min

Max

Long

Time

X X

Examples

Programmer

units

without

the

Ground

Fault

element

are

identical

;

with

Ground

Fault

however

the

programmers

have

different

pickup

ranges

Sensor

tap

rat

ings

also

differ

for

each

frame

Short

Time

Instantaneous

Ground

Fault

These

instructions

not

purport

cover

all

details

variations

equipment

nor

provide

for

every

possible

contin

gency

met

connection

with

installation

operation

maintenance

Should

further

information

desired

should

particular

problems

arise

which

are

not

covered

sufficiently

for

the

purchaser

’

purposes

the

matter

should

referred

the

General

Electric

Company

Courtesy of NationalSwitchgear.com

The

SST

programmer

units

can

optionally

equipped

with

trip

indicators

(

targets

)

These

are

pop

out

mechanically

resettable

plungers

located

across

the

top

the

programmers

front

Units

with

ground

fault

element

employ

three

(

)

targets

from

left

right

the

first

for

overload

the

second

for

short

circuit

(

actuated

the

short

time

and

instan

taneous

elements

)

and

the

third

for

ground

fault

The

latter

omitted

units

without

ground

fault

SOLID

STATE

SWITCH

•

FLUX

SHIFT

TRIP

COIL

CURRENT

SENSOR

TAP

CHANGER

OVERLOAD

TARGET

LONG

TIME

DELAY

TTT

LONG

SHORT

TIME

PICKUP

DELAY

LOGIC

’

TIME

Each

target

pops

out

when

its

associated

trip

ele

ment

operates

trip

the

breaker

After

trip

the

popped

target

must

reset

hand

However

glecting

reset

does

not

affect

normal

operation

any

trip

element

prevent

the

breaker

from

being

reclosed

NEUTRAL

“

”

PICKUP

(

)

SHORT

CIRCUIT

TARGET

DIFFERENTIAL

TRANSFORMER

INSTANTANEOUS

PICKUP

WHEN

USED

GROUND

TARGET

GROUND

FAULT

PICKUP

DELAY

REGULATED

VDC

POWER

SUPPLY

Current

Sensors

—

each

pole

mounts

single

sensor

coil

(

)

which

supplies

the

power

and

signal

inputs

necessary

operate

the

trip

system

Each

sensor

has

four

taps

which

provide

field

adjustment

the

trip

device

’

continuous

ampere

rating

PROGRAMMER

UNIT

Fig

SST

Block

diagram

The

SST

Ground

Fault

trip

element

operates

the

principle

that

the

instantaneous

values

current

the

three

conductors

(

four

wire

systems

)

add

zero

unless

ground

current

exists

SST

’

equipped

with

Ground

Fault

the

ground

trip

signal

developed

connecting

each

phase

sensor

ries

with

companion

primary

winding

ground

differential

transformer

mounted

the

programmer

unit

Its

secondary

output

zero

long

there

ground

current

When

used

the

neutral

sensor

(

fig

)

separately

mounted

the

bus

cable

compartment

the

switchgear

drawout

construction

its

output

tomatically

connected

the

breaker

via

secondary

disconnect

blocks

See

Figs

and

Application

the

Ground

Fault

element

wire

systems

with

neutral

grounded

the

transformer

quires

additional

separately

mounted

sensor

(

Fig

)

inserted

the

neutral

conductor

;

its

secondary

connected

fourth

primary

winding

the

ground

differential

transformer

See

Fig

This

“

fourth

wire

”

neutral

sensor

electrical

duplicate

the

phase

sensor

including

taps

Therefore

when

taps

are

changed

the

phase

sensors

those

the

neu

tral

sensor

must

correspondingly

positioned

Flux

Shift

Trip

Device

—

low

energy

elec

tromagnetic

device

which

upon

receipt

trip

sig

nal

from

the

programmer

unit

trips

the

breaker

actuating

the

trip

shaft

See

Fig

COMPONENT

LOCATION

All

components

except

the

neutral

sensor

are

mounted

the

circuit

breaker

The

phase

sensors

are

mounted

around

the

lower

studs

the

rear

the

breaker

(

see

Fig

)

The

programmer

unit

and

the

flux

shift

trip

device

are

mounted

the

breaker

’

front

frame

These

components

are

interconnected

wiring

harness

and

disconnect

plugs

shown

the

cabling

diagrams

(

Figs

and

)

Fig

SST

phase

sensor

with

tap

board

Courtesy of NationalSwitchgear.com

connector

Tap

terminal

board

Shorting

strap

Fig

Neutral

sensor

secondary

disconnect

block

(

equipment

mounted

)

Fig

SST

neutral

sensor

(

equipment

mounted

)

Courtesy of NationalSwitchgear.com

Fig

100

(

front

view

)

TABLE

—

SST

TRIP

CHARACTERISTICS

SST

PROGRAMMER

ADJUSTMENT

RANGE

(

Set

Points

)

Sensor

Ampere

Taps

Long

Time

Short

Time

Ground

Fault

Frame

Size

(

Amperes

)

Instantaneous

Pickup

Breaker

Type

Pickup

(

)

Time

Delay

Band

(

Seconds

)

Pickup

Time

Delay

Band

(

Seconds

)

Pickup

Time

Delay

Band

(

Seconds

)

(

)

Multiple

1200

1600

2000

3000

Maximum

(

)

1.75

2.25

2.5

(

)

Maximum

0.35

Intermed

0.21

Minimum

0.095

(

)

Maximum

0.30

Intermed

0.165

Minimum

0.065

1.0

1.1

(

)

Intermed

(

)

4000

1600

2000

3000

4000

100

Minimum

(

)

Sensor

ampere

tap

trip

rating

Pickup

tolerance

Time

delay

lower

limit

band

Time

delay

lower

limit

band

(

See

pages

and

for

applicable

time

current

curves

)

Courtesy of NationalSwitchgear.com

Flux

shift

trip

device

Fig

(

front

view

)

“

reset

”

position

Loosen

the

jam

nut

rotate

the

juster

end

until

the

proper

gap

attained

then

tighten

the

jam

nut

While

operating

the

breaker

insure

that

the

actua

tor

bracket

does

not

interfere

with

the

buffer

stud

Adjust

necessary

FLUX

SHIFT

TRIP

DEVICE

The

mounting

arrangement

this

component

lustrated

Figures

and

electromagnetic

actuator

mounted

the

left

side

the

front

frame

coupled

the

breaker

’

trip

shaft

via

trip

rod

driven

the

actuator

arm

The

actuator

sole

noid

whose

armature

spring

loaded

and

held

its

normal

(

reset

)

position

permanent

magnet

this

state

the

spring

tension

The

actuator

sealed

factory

set

device

and

quires

maintenance

field

adjustment

case

malfunction

the

complete

actuator

unit

should

placed

When

making

the

electrical

connection

the

replacement

unit

recommended

that

the

breaker

harness

cut

some

convenient

point

and

the

new

actuator

leads

solder

spliced

thereto

alternate

method

untie

the

breaker

harness

and

remove

the

old

actuator

leads

directly

from

the

female

AMP

connector

the

end

the

breaker

harness

How

ever

AMP

extraction

tool

Cat

305183

quired

for

this

method

long

the

actuator

remains

the

reset

posi

tion

the

breaker

can

closed

and

opened

normally

will

However

when

closed

breaker

receives

trip

signal

from

the

programmer

unit

the

actuator

energized

and

its

solenoid

flux

opposes

the

magnet

allowing

the

spring

release

the

armature

;

this

drives

the

trip

rod

against

the

trip

shaft

paddle

trip

ping

the

breaker

the

breaker

opens

the

actuator

arm

returned

its

normal

(

reset

)

position

via

linkage

driven

bracket

attached

the

breaker

’

crossbar

The

per

manent

magnet

again

holds

the

armature

captive

readiness

for

the

trip

signal

See

Fig

CAUTION

THE

EVENT

THAT

THE

SST

TRIP

DEVICE

MUST

RENDERED

OPERATIVE

ALLOW

THE

BREAKER

CARRY

CURRENT

WITHOUT

BENEFIT

OVERCURRENT

PROTECTION

THE

RECOMMENDED

METHOD

SHORTEN

THE

TRIP

ROD

TURNING

ITS

ADJUSTER

END

FULLY

CLOCKWISE

THIS

PREVENTS

ACTUATION

THE

TRIP

SHAFT

PADDLE

The

trip

device

requires

one

basic

adjustment

—

the

trip

rod

length

shown

Fig

the

clearance

between

the

trip

rod

end

and

the

trip

shaft

paddle

gaged

093

dia

rod

adjust

open

the

breaker

and

restore

the

breaker

mechanism

its

Courtesy of NationalSwitchgear.com

BUFFER

STUD

ACTUATOR

BRACKET

Flux

shift

trip

device

—

reset

linkage

attachment

Actuator

arm

Trip

rod

Trip

rod

adjuster

end

Reset

linkage

Actuator

bracket

Mounting

base

Flux

shift

trip

device

with

operating

linkages

Courtesy of NationalSwitchgear.com

CROSSBAR

(

BKR

OPEN

)

ACTUATOR

BRACKET

BUFFER

STUD

POSITION

TRIP

PADDLE

“

MECHANISM

RESET

’’

POSITION

JAM

NUT

(

093

DIA

TRIP

ROD

“

RESET

POSITION

ROD

ADJUSTER

END

Fig

Flux

shift

trip

device

adjustments

SIDE

VIEW

Trip

rod

length

Adjust

gap

0.093

0.015

using

0.093

diam

rod

shown

Actuator

bracket

the

crossbar

travels

between

the

breaker

closed

’’

and

“

breaker

open

”

positions

the

tang

the

actuator

bracket

must

clear

the

buffer

stud

sufficient

clearance

exists

loosen

’

two

mounting

screws

and

rotate

the

bracket

clockwise

take

mounting

hole

slack

Retighten

screws

(

Courtesy of NationalSwitchgear.com

testing

two

poles

the

breaker

nes

Using

the

Ground

Fault

Defeat

Cable

shown

Fig

This

special

test

cable

energizes

all

the

primary

windings

the

differential

transformer

self

cancell

ing

series

parallel

connection

that

its

secondary

output

always

zero

TROUBLESHOOTING

When

malfunctioning

suspected

tne

first

step

troubleshooting

examine

the

circuit

breaker

and

its

power

system

for

abnormal

conditions

such

Breaker

tripping

proper

response

over

currents

incipient

ground

faults

Breaker

remaining

trip

free

state

due

mechanical

interference

along

its

trip

shaft

Inadvertent

shunt

trip

activations

Test

the

components

the

SST

system

using

portable

Test

Set

type

TAK

(

Fig

)

The

applicable

test

procedures

are

detailed

struction

Book

GEK

64454

and

are

summarized

below

WARNING

NOT

CHANGE

TAPS

THE

CURRENT

SENSORS

ADJUST

THE

PROGRAMMER

UNIT

SET

KNOBS

WHILE

THE

BREAKER

CARRYING

CURRENT

USING

THE

SST

TEST

SET

Once

has

been

established

that

the

circuit

breaker

can

opened

and

closed

normally

from

the

test

position

attention

can

directed

the

trip

vice

proper

Testing

performed

either

two

methods

The

TAK

Test

Set

portable

instrument

designed

for

field

checking

the

time

current

charac

teristics

and

pickup

calibration

the

SST

’

various

trip

elements

can

verify

the

ability

the

Flux

Shift

Trip

Device

trip

the

breaker

and

addi

tion

includes

means

for

continuity

checking

the

phase

sensors

Conduct

high

current

single

phase

tests

the

breaker

using

high

current

low

voltage

test

set

WARNING

BEFORE

CONNECTING

THE

TEST

SET

THE

BREAKER

TRIP

DEVICE

SYSTEM

ENSURE

THAT

THE

CIRCUIT

BREAKER

COMPLETELY

DISCON

NECTED

FROM

ITS

POWER

SOURCE

DRAWOUT

EQUIPMENT

RACK

THE

BREAKER

ITS

DISCONNECTED

POSI

TION

VERIFY

THAT

THE

BREAKER

TRIPPED

NOTE

For

these

single

phase

tests

spe

cial

connections

must

employed

for

SST

breakers

equipped

with

Ground

Fault

Any

single

phase

input

the

ground

differential

transformer

will

gener

ate

unwanted

ground

fault

”

output

signal

which

will

trip

the

breaker

This

can

nullified

either

Fig

SST

ECS

test

set

CAT

TAK

Courtesy of NationalSwitchgear.com

This manual suits for next models

Popular Circuit Breaker manuals by other brands

ABB

ABB SACE Emax 2 E2.2 manual

Eaton

Eaton NOVA LBS 15 Installation and operation instructions

Gewiss

Gewiss 90 RCD Installation

ABB

ABB SACE Emax E1 quick start guide

Siemens

Siemens SIRIUS 3RV1742 Original operating instructions

WEG

WEG FHU ACW125 installation instructions

Siemens

Siemens Sentron 3VA9157-0PK1 Series operating instructions

hager

hager TS 303 User instruction

ETI

ETI EFI-4B Instructions for mounting

nader

nader NDM3EU-225 operating instructions

TERASAKI

TERASAKI NHP TemBreak PRO P160 Series installation instructions

Gladiator

Gladiator GCB150 Installation instruction

Eaton

Eaton 50DHP-VR Instruction handbook

ABB

ABB SACE Emax 2 E6.2 Instruction handbook

OEZ

OEZ LFN Instructions for use

Eaton

Eaton Power Defense PDG2 Instruction leaflet

Bticino

Bticino L4412CM2 quick start guide

Eaton

Eaton S-T0 Instruction leaflet