GE IFC57AD Manuale utente

INSTRUCTIONS

GEK

49948

Supersedes

GEK

49948

TIME

OVERCURRENT

RELAYS

TYPES

IFC

AND

IFC

GENERAL

ELECTRIC

Courtesy of NationalSwitchgear.com

GEK

49948

TABLE

CONTENTS

PAGE

DESCRIPTION

APPLICATION

CONSTRUCTION

RATINGS

TIME

OVERCURRENT

UNIT

HIGH

SEISMIC

INSTANTANEOUS

UNIT

HIGH

SEISMIC

TARGET

AND

SEAL

UNIT

CONTACTS

BURDENS

CHARACTERISTICS

TIME

OVERCURRENT

UNIT

Pickup

Operating

Time

Accuracy

Reset

HIGH

SEISMIC

INSTANTANEOUS

UNIT

HIGH

SEISMICTARGET

AND

SEAL

UNIT

RECEIVING

HANDLING

AND

STORAGE

ACCEPTANCE

TESTS

VISUAL

INSPECTION

MECHANICAL

INSPECTION

DRAWOUT

RELAY

TESTING

POWER

REQUIREMENTS

GENERAL

TIME

OVERCURRENT

UNIT

Time

Setting

Pickup

Test

Time

Test

HIGH

SEISMIC

INSTANTANEOUS

UNIT

Setting

the

High

Seismic

Instantaneous

Unit

HIGH

SEISMICTARGET

ANDSEAL

UNIT

Pickup

and

Dropout

Test

INSTALLATION

TESTS

Time

Overcurrent

Units

High

Seismic

Target

and

Seal

Unit

High

Seismic

Instantaneous

Unit

PERIODIC

CHECKS

AND

ROUTINE

MAINTENANCE

TIME

OVERCURRENT

UNIT

HIGH

SEISMIC

INSTANTANEOUS

UNIT

HIGH

SEISMICTARGET

ANDSEAL

UNIT

CONTACT

CLEANING

COVER

CLEANING

SYSTEM

TEST

SERVICING

TIME

OVERCURRENT

UNIT

Pickup

Test

Time

Tests

MECHANICAL

ADJUSTMENT

HIGH

SEISMIC

INSTANTANEOUS

UNIT

HIGH

SEISMIC

AND

SEAL

UNIT

RENEWAL

PARTS

LIST

FIGURES

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GEK

49948

TIME

OVERCURRENT

RELAYS

TYPES

IFC

AND

IFC

DESCRIPTION

The

type

IFC

relays

covered

these

instructions

are

extended

range

single

phase

time

overcurrent

relays

having

medium

time

inverse

characteristic

type

IFC

relays

are

similar

except

that

they

include

addition

hinged

armature

instantaneous

overcurrent

unit

that

provides

instantaneous

tripping

high

current

levels

when

that

feature

desired

and

the

instantaneous

overcurrent

unit

are

described

detail

the

section

CONSTRUCTION

Both

relays

are

equipped

with

dual

rated

target

and

seal

unit

The

Both

the

time

overcurrent

unit

addition

the

contacts

that

are

normally

provided

for

tripping

each

the

relays

provided

with

contacts

that

may

used

for

alarm

remote

indication

other

purposes

deemed

suitable

the

user

Note

that

the

contacts

associated

with

the

target

and

seal

unit

will

operate

only

after

the

time

overcurrent

unit

contacts

draw

trip

current

hence

they

are

not

reliable

for

use

tripping

contacts

See

the

internal

and

external

connections

for

the

exact

contact

arrangement

used

each

the

relays

Figures

and

When

semiflush

mounted

suitable

panel

these

relays

have

high

seismic

capability

including

both

the

target

seal

unit

and

the

instantaneous

overcurrent

unit

when

supplied

Also

these

relays

are

recognized

under

the

Components

Program

Underwriters

Laboratories

Inc

The

relays

are

mounted

size

drawout

case

molded

construction

The

outline

and

panel

drilling

are

shown

Figures

and

The

relay

internal

connections

are

shown

Figure

for

the

IFC

and

Figure

for

the

IFC

APPLICATION

Time

overcurrent

relays

find

extensive

general

use

the

protection

utility

and

industrial

power

distribution

systems

and

frequently

overload

back

protection

other

locations

The

medium

time

inverse

characteristic

the

IAC

relays

particularly

useful

back

ground

fault

protection

low

and

medium

voltage

industrial

systems

when

the

relay

connected

current

transformer

the

neutral

power

transformer

generator

Typical

external

connections

for

such

application

are

shown

Figure

These

instructions

not

purport

cover

all

details

variations

equipment

nor

provide

for

every

possible

contingency

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

the

extent

required

the

products

described

herein

meet

applicable

ANSI

IEEE

and

NEMA

standards

;

but

such

assurance

given

with

respect

local

codes

and

ordinances

because

they

vary

greatly

Courtesy of NationalSwitchgear.com

GEK

49948

When

setting

these

relays

coordinate

with

downstream

relays

coordination

time

from

0.25

0.40

second

generally

allowed

depending

the

clearing

time

the

breaker

involved

These

coordination

times

include

addition

breaker

clearing

time

0.10

second

for

relay

overtravel

and

0.17

second

for

safety

factor

example

the

breaker

clearing

time

0.13

second

(

eight

cycles

)

the

coordination

time

would

0.40

second

(

0.13

0.10

0.17

)

For

the

relay

time

set

test

the

current

level

question

the

safety

factor

may

reduced

0.07

second

Then

the

downstream

breaker

time

five

(

)

cycles

(

0.08

second

)

minimum

0.25

second

(

0.08

0.10

0.07

)

could

allowed

for

coordination

relay

coordination

times

are

marginal

impossible

obtain

use

the

relay

overtravel

curves

Figure

refine

the

relay

settings

relay

operating

time

necessary

just

match

the

operating

time

the

downstream

relay

with

which

coordination

desired

Determine

the

multiple

pickup

and

the

necessary

time

dial

setting

provide

this

relay

operating

time

approximate

curve

Figure

determine

the

overtravel

time

percent

operating

time

and

convert

this

into

real

time

Add

this

time

the

breaker

time

the

safety

factor

time

and

the

original

relay

operating

time

determine

the

final

relay

operating

time

required

Set

the

relay

this

value

First

determine

the

Use

the

ground

fault

back

application

not

customary

use

the

instantaneous

unit

other

applications

where

instantaneous

unit

needed

must

realized

that

this

unit

has

transient

overreach

characteristic

illustrated

Figure

This

the

result

the

offset

that

usually

present

the

current

the

inception

fault

When

determining

the

pickup

setting

for

this

unit

the

transient

overreach

must

taken

into

consideration

The

percent

transient

overreach

should

applied

proportionately

reduce

the

calculated

pickup

setting

that

the

instantaneous

unit

will

not

overreach

downstream

device

and

thereby

cause

loss

coordination

the

system

protection

scheme

The

operating

time

characteristics

this

unit

are

shown

Figure

CONSTRUCTION

The

IFC

induction

disk

relays

consist

molded

case

cover

support

structure

assembly

and

connection

plug

make

the

electrical

connection

See

cover

figure

and

Figures

and

Figure

shows

the

induction

unit

mounted

the

molded

support

structure

This

disk

activated

current

operating

coil

mounted

laminated

magnet

The

disk

and

shaft

assembly

carries

moving

contact

that

completes

the

alarm

trip

circuit

when

touches

stationary

contact

The

disk

assembly

restrained

spiral

spring

give

the

proper

contact

closing

current

The

disk

rotation

retarded

permanent

magnet

mounted

molded

housing

the

support

structure

The

drawout

connection

test

system

for

the

case

shown

Figure

has

provisions

for

connection

points

and

visible

shorting

bar

located

front

the

connection

plug

withdrawn

clears

the

shorter

contact

fingers

the

output

contact

circuits

first

Thus

the

trip

circuit

opened

before

any

other

circuits

are

disconnected

current

circuit

fingers

the

case

connection

block

engage

the

shorting

bar

(

located

the

lower

front

the

case

)

short

circuit

external

current

transformer

secondary

connections

The

window

provides

visual

confirmation

shorting

The

connection

plug

then

clears

the

current

circuit

contact

fingers

the

case

and

finally

those

the

relay

support

structure

completely

energize

the

drawout

element

Courtesy of NationalSwitchgear.com

GEK

49948

There

High

Seismic

target

and

seal

unit

the

front

the

left

the

shaft

the

time

overcurrent

unit

see

Figure

electrically

separate

contacts

one

which

series

with

its

coil

and

parallel

with

the

contacts

the

time

overcurrent

unit

such

that

when

the

induction

unit

contacts

the

seal

unit

picks

and

seals

seal

unit

picks

raises

target

into

view

that

latches

and

remains

exposed

until

released

pressing

reset

button

located

the

upper

left

side

the

cover

The

seal

unit

has

two

When

the

The

IFC

model

relays

contain

addition

the

above

High

Seismic

instantaneous

unit

see

Figure

The

instantaneous

unit

small

hinged

type

unit

with

electrically

separate

contacts

and

mounted

the

front

the

right

the

shaft

the

time

overcurrent

unit

One

its

contacts

normally

connected

parallel

with

the

contacts

the

time

overcurrent

unit

and

its

coil

connected

series

with

the

time

overcurrent

unit

When

the

instantaneous

unit

picks

raises

target

that

latches

and

remains

exposed

until

released

The

same

rest

button

that

releases

the

target

seal

unit

also

releases

the

target

the

instantaneous

unit

magnetic

shield

depicted

Figure

mounted

the

support

structure

eliminate

the

proximity

effect

external

magnetic

materials

Both

the

High

Seismic

target

and

seal

unit

and

the

High

Seismic

instantaneous

unit

have

the

letters

molded

into

their

target

blocks

distinguish

them

High

Seismic

units

The

Seismic

Fragility

Level

exceeds

peak

axial

acceleration

lOg

(

ZPA

)

when

tested

using

biaxial

multi

frequency

input

motion

produce

Required

Response

Spectrum

(

RRS

)

accordance

with

the

IEEE

Guide

for

Seismic

Testing

Relays

STD

501

1978

RATINGS

The

relays

are

designed

for

operation

ambient

air

temperature

from

TIME

OVERCURRENT

UNIT

Ranges

for

the

time

overcurrent

unit

are

shown

Table

TABLE

CURRENT

RANGE

(

AMPERES

)

FREQUENCY

(

HERTZ

)

RELAY

0.5

1.0

12.0

4.0

and

IFC

and

Available

taps

for

the

time

overcurrent

unit

are

shown

Table

TABLE

TAPS

AVAILABLE

(

AMPERES

)

RANGE

(

AMPERES

)

0.5

0.6

0.7

0.8

1.0

1.2

1.5

2.0

2.5

3.0

4.0

0.5

4.0

1.0

1.2

1.5

2.0

2.5

3.0

4.0

5.0

6.0

7.0

8.0

10.0

12.0

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GEK

49948

The

one

second

thermal

ratings

are

listed

Table

III

TABLE

III

TIME

OVERCURRENT

UNIT

(

AMPERES

)

SEC

RATING

ANY

TAP

(

AMPERES

)

MODEL

128

0.5

4.0

384

IFC

1.0

12.0

260

600

Ratings

less

than

one

second

may

calculated

according

the

formula

where

the

time

seconds

that

the

current

flows

The

continuous

ratings

for

the

time

overcurrent

unit

are

shown

Tables

and

TABLE

0.5

4.0

AMPERE

RANGE

RATINGS

MODEL

IFC

0.5

0.6

0.7

0.8

1.0

1.2

1.5

2.0

2.5

3.0

4.0

TAP

CONT

CURR

2.3

2.5

2.6

2.9

3.3

3.6

4.1

4.7

5.3

5.8

6.8

TABLE

1.0

12.0

AMPERE

RANGE

RATINGS

MODEL

IFC

1.0

1.2

1.5

2.0

2.5

3.0

4.0

5.0

6.0

TAP

8.0

10.0

12.0

7.0

CONT

CURR

3.9

4.3

4.8

5.3

6.2

6.8

7.8

8.8

9.7

10.4

11.1

12.4

13.6

HIGH

SEISMIC

INSTANTANEOUS

UNIT

(

IFC

)

The

instantaneous

coil

tapped

for

operation

either

one

two

ranges

(

The

position

the

link

located

the

top

the

support

structure

determines

whether

the

range

high

low

See

Figure

and

Table

)

TABLE

HIGH

SEISMIC

INSTANTANEOUS

LINK

UNIT

(

AMPS

)

POSITION

CONTINUOUS

RATING

(

AMPS

)

ttfONE

SECOND

RATING

(

AMPS

)

RANGE

(

AMPS

)

1 0

130

900

3.7

7.5

150

3 0

150

10.2

600

260

19.6

The

range

approximate

which

means

that

the

may

There

will

always

least

one

ampere

overlap

between

the

maximum

and

the

minimum

setting

Whenever

possible

sure

select

the

higher

range

order

obtain

the

higher

continuous

and

short

time

ratings

fft

Higher

currents

may

applied

for

shorter

lengths

time

accordance

with

the

formula

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GEK

49948

Since

the

instantaneous

unit

coil

series

with

the

time

overcurrent

unit

coil

see

Tables

III

and

determine

the

current

limiting

element

for

both

continuous

and

short

time

ratings

HIGH

SEISMIC

TARGET

AND

SEAL

UNIT

Ratings

for

the

target

and

seal

unit

are

shown

Table

VII

TABLE

VII

TAP

0.2

2.0

Resistance

(

Ohms

)

8.0

0.24

Minimum

Operating

(

Amp

)

0.2

2.0

Carry

Continuous

(

Amperes

)

0.3

Carry

Amps

for

(

Seconds

)

0.03

Carry

Amps

for

(

Seconds

)

0.25

Hertz

Impedance

(

Ohms

)

0.73

68.6

the

tripping

current

exceeds

amperes

anauxiliary

relay

should

used

the

connections

beinf

such

the

tripping

current

does

not

pass

through

the

contacts

the

target

and

seal

coils

the

protective

relay

CONTACTS

The

current

closing

rating

the

contacts

amperes

for

voltages

not

exceeding

250

volts

unit

The

current

carrying

rating

limited

the

ratings

the

seal

BURDENS

Burdens

for

the

time

overcurrent

unit

are

given

Table

VIII

TABLE

VIII

Burdens

Ohms

(

)

Times

Pickup

Burdens

Min

Pickup

Min

Tap

(

Ohms

)

Min

Range

Model

Tap

Amps

2.27

7.18

7.35

3.89

1.68

1.12

0.5

4.0

0.5

0.43

1.69

1.75

0.93

0.43

0.31

1.0

12.0

1.0

IFC

2.72

8.62

9.04

4.67

2.01

1.34

0.5

4.0

0.5

1.0

12.0

1.0

0.52

2.03

2.10

1.12

0.52

0.37

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GEK

49948

NOTE

The

impedance

values

given

are

those

for

minimum

tap

each

range

;

the

impedance

for

other

taps

pickup

current

(

tap

rating

)

varies

inversely

(

approximately

)

the

square

the

tap

rating

example

IFC

hertz

relay

with

0.5

impedance

9.04

ohms

the

0.5

amp

tap

amp

tap

(

0.5

2.0

)

9.04

0.565

ohms

For

4.0

amp

range

has

The

impedance

the

2.0

The

High

Seismic

instantaneous

unit

burdens

(

IFC

)

are

listed

Table

TABLE

High

Seismic

Inst

Unit

(

Amps

Burdens

Min

Pickup

Min

Tap

(

Ohms

)

Burdens

Ohms

(

)

Times

Pickup

Min

Pickup

(

Amps

)

Link

Range

Position

(

Amps

)

1 0

0.750

0.650

0.992

0.634

0.480

0.457

5 0

6 0

0.070

0.024

0.074

0.072

0.071

0.070

0.110

0.078

0.135

0.095

0.081

0.079

150

0.022

0.005

0.023

0.022

1 0

0.625

0.542

0.827

0.528

0.400 0.380

5 0 5 0

0.058 0.020

0.062

0.060

0.059

0.058

3 0

0.092

0.065

0.112

0.079

0.068

0.066

150

0.018

0.004

0.019

0.018 0.018

0.018

CHARACTERISTICS

TIME

OVERCURRENT

UNIT

Pickup

these

relays

defined

the

current

required

the

contacts

from

the

0.5

time

dial

position

Current

settings

are

made

means

two

movable

leads

that

connect

the

tap

block

the

top

the

support

structure

see

Figure

The

tap

block

marked

through

See

the

name

plate

the

relay

for

its

tap

settings

Example

The

two

amp

(

amp

)

tap

for

IFC

time

overcurrent

relay

requires

one

movable

lead

position

and

the

other

position

Operating

Time

Accuracy

The

IFC

relays

should

operate

within

the

published

time

curve

Figures

and

show

the

various

time

current

characteristics

for

the

IFC

relays

The

setting

the

time

dial

determines

the

length

the

time

required

the

contacts

for

given

current

The

higher

the

time

dial

setting

the

longer

the

operating

time

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GEK

49948

The

maximum

time

The

contacts

are

just

closed

when

the

time

dial

set

zero

setting

occurs

when

the

time

dial

set

and

the

disk

has

travel

its

maximum

distance

the

contacts

Reset

times

are

The

unit

resets

the

minimum

closing

current

proportionate

the

time

dial

settings

The

time

reset

the

number

time

dial

position

when

the

current

reduced

zero

approximately

seconds

for

the

IFC

relays

HIGH

SEISMIC

INSTANTANEOUS

UNIT

(

IFC

)

There

are

high

and

The

instantaneous

unit

has

range

with

tapped

coil

low

ranges

selected

means

link

located

the

top

the

support

structure

shown

Figure

The

time

current

curve

for

the

instantaneous

unit

See

Figure

HIGH

SEISMIC

TARGET

AND

SEAL

UNIT

The

target

and

seal

unit

has

two

(

)

tap

selections

located

the

front

the

unit

See

Figure

RECEIVING

HANDLING

AND

STORAGE

These

relays

when

not

included

part

control

panel

will

shipped

cartons

designed

protect

them

against

damage

Immediately

upon

receipt

relay

examine

for

any

damage

sustained

transit

injury

damage

resulting

from

rough

handling

evident

file

damage

claim

once

with

the

transportation

company

and

promptly

notify

the

nearest

General

Electric

Sales

Office

Reasonable

care

should

exercised

unpacking

the

relay

order

that

none

the

parts

are

injured

nor

the

adjustments

disturbed

the

relays

are

not

installed

immediately

they

should

stored

their

original

cartons

place

that

free

from

moisture

dust

and

metallic

chips

Foreign

matter

collected

the

outside

may

find

its

way

inside

when

the

cover

removed

and

cause

trouble

the

operation

the

relay

ACCEPTANCE

TESTS

Immediately

upon

receipt

the

relay

INSPECTION

and

ACCEPTANCE

TEST

should

made

make

sure

that

damage

has

been

sustained

shipment

and

that

the

relay

calibrations

have

not

been

disturbed

readjustment

necessary

refer

the

section

SERVICING

the

examination

test

indicates

that

These

tests

may

performed

part

the

installation

acceptance

tests

the

discretion

the

user

Since

most

operating

companies

use

different

procedures

for

acceptance

tests

and

for

installation

tests

the

following

section

includes

all

applicable

tests

that

may

performed

these

relays

Courtesy of NationalSwitchgear.com

GEK

49948

VISUAL

INSPECTION

Check

the

nameplate

make

sure

that

the

model

number

and

rating

the

relay

agree

with

the

requisition

Remove

the

relay

from

its

case

and

check

that

there

are

broken

cracked

parts

any

other

signs

physical

damage

MECHANICAL

INSPECTION

There

should

noticeable

friction

when

the

disk

rotated

slowly

clockwise

The

disk

should

return

itself

its

rest

position

Make

sure

the

control

tangled

touching

spring

not

deformed

nor

its

convolutions

The

armature

and

contacts

the

seal

unit

well

the

armature

and

contacts

the

instantaneous

unit

should

move

freely

when

operated

hand

There

should

least

inch

wipe

the

instantaneous

unit

contacts

(

see

SERVICING

section

for

seal

unit

)

The

targets

the

seal

unit

and

the

instantaneous

unit

must

come

into

view

and

latch

when

the

armatures

are

operated

hand

and

should

unlatch

when

the

target

release

button

operated

Make

sure

that

the

brushes

and

shorting

bars

agree

with

the

internal

connections

diagram

CAUTION

Should

there

need

tighten

any

screws

prevent

stripping

NOT

OVER

TIGHTEN

DRAWOUT

RELAY

TESTING

IFC

relays

may

tested

without

removing

them

from

the

panel

using

either

the

XCA

test

probes

The

test

probes

make

connections

both

the

relay

and

the

external

circuitry

which

provides

maximum

flexibility

but

requires

reasonable

care

since

shorting

jumper

necessary

when

testing

the

relay

The

test

probes

are

different

the

number

connections

that

can

made

The

XCA

has

full

complement

connections

and

the

XCA

has

four

Refer

instruction

book

GEK

49803

for

additional

information

POWER

REQUIREMENTS

GENERAL

All

devices

operating

alternating

current

(

)

are

affected

frequency

Since

non

sinusoidal

waveforms

can

analyzed

fundamental

frequency

plus

harmonics

that

fundamental

frequency

follows

that

alternating

current

devices

(

relays

)

will

affected

applied

waveforms

relays

(

and

devices

general

)

are

significantly

affected

the

application

non

sinusoidal

waveforms

Therefore

order

test

relays

properly

essential

use

test

voltage

and

current

waveform

that

sinusoidal

The

purity

the

sine

wave

Courtesy of NationalSwitchgear.com

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