GE IFCV51AD Manuale utente

GEK

49946

INSTRUCTIONS

TIME

OVERCURRENT

RELAYS

WITH

VOLTAGE

RESTRAINT

TYPES

IFCV

msi

HIII

jfSf

;

Protection

and

Control

205

Great

Valley

Parkway

Malvern

19355

1337

Courtesy of NationalSwitchgear.com

GEK

49946

CONTENTS

PAGE

DESCRIPTION

APPLICATION

CALCULATION

SETTINGS

CONSTRUCTION

RATINGS

INDUCTION

UNIT

HIGH

SEISMIC

INSTANTANEOUS

UNIT

HIGH

SEISMIC

TARGET

AND

SEAL

UNIT

CONTACTS

BURDENS

INDUCTION

UNIT

HIGH

SEISMIC

INSTANTANEOUS

UNIT

CHARACTERISTICS

INDUCTION

UNIT

HIGH

SEISMIC

INSTANTANEOUS

UNIT

HIGH

SEISMIC

TARGET

AND

SEAL

UNIT

RECEIVING

HANDLING

AND

STORAGE

ACCEPTANCE

TESTS

VISUAL

INSPECTION

MECHANICAL

INSPECTION

DRAWOUT

RELAY

TESTING

POWER

REQUIREMENTS

GENERAL

INDUCTION

UNIT

HIGH

SEISMIC

INSTANTANEOUS

UNIT

HIGH

SEISMIC

TARGET

AND

SEAL

UNIT

INSTALLATION

TESTS

PERIODIC

CHECKS

AND

ROUTINE

MAINTENANCE

INDUCTION

UNIT

HIGH

SEISMIC

INSTANTANEOUS

UNIT

HIGH

SEISMIC

TARGET

AND

SEAL

UNIT

CONTACT

CLEANING

SYSTEM

TEST

SERVICING

INDUCTION

UNIT

HIGH

SEISMIC

INSTANTANEOUS

UNIT

HIGH

SEISMIC

TARGET

AND

SEAL

UNIT

RENEWAL

PARTS

LIST

FIGURES

Courtesy of NationalSwitchgear.com

GEK

49946

TIME

OVERCURRENT

RELAYS

WITH

VOLTAGE

RESTRAINT

TYPES

IFCV

DESCRIPTION

The

Type

IFCV

relay

single

phase

extended

range

very

inverse

time

overcurrent

relay

with

voltage

restraint

similar

the

IFC

relay

except

that

voltage

restraint

magnet

and

coil

has

been

added

that

produces

restraint

torque

that

opposes

the

operating

coi

The

time

overcurrent

unit

The

IFCV

overcurrent

included

respectively

the

IFCV

with

components

identified

the

nomenclature

used

throughout

the

text

The

relays

are

equipped

with

dual

rated

target

and

seal

unit

having

two

electrically

separate

contacts

They

are

mounted

size

case

molded

construction

The

outline

and

panel

drilling

dimensions

are

shown

Figure

for

semi

flush

mounting

and

Figure

for

surface

mounting

When

semi

flush

capa

similar

the

IFCV

except

that

instantaneous

Figures

and

show

the

front

and

back

views

mounted

suitable

panel

these

relays

have

high

seismic

The

internal

connections

are

shown

Figure

for

the

IFCV

and

Figure

for

the

IFCV

APPLICATION

system

must

protected

against

prolonged

generator

contribution

fault

the

system

contributing

current

the

generator

The

IFCV

relay

one

several

relays

designed

specifically

for

this

application

applied

provide

such

back

protection

Others

are

the

Type

IFCS

voltage

controlled

overcurrent

relay

three

single

phase

distance

relays

plus

timer

(

for

balanced

fault

back

protection

)

and

the

Type

INC

SGC

relays

for

unbalanced

fault

back

protection

Such

back

protection

best

made

the

source

the

The

choice

between

the

IFCV

the

distance

relays

determined

primarily

the

protective

relaying

with

which

the

generator

back

relays

must

selective

For

example

the

lines

leaving

the

station

bus

are

protected

very

inverse

time

overcurrent

relays

then

Type

IFCV

relays

should

used

These

instructions

not

purport

cover

ell

details

variations

equipment

nor

provide

for

every

possible

contingency

met

connection

with

instailation

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

but

such

assurance

given

with

respect

local

codes

and

ordinances

because

they

vary

greatly

Should

operation

maintenance

IEEE

and

NEKA

standards

Courtesy of NationalSwitchgear.com

49946

This

would

typical

installations

where

the

generator

connects

the

bus

generator

voltage

installations

generally

connect

high

voltage

system

which

distance

pilot

relaying

schemes

are

frequently

used

for

the

line

protection

such

cases

distance

relays

such

the

CEB

plus

timer

would

the

usual

choice

for

system

back

provide

coordination

with

the

line

relaying

the

other

hand

unit

generator

transformer

For

the

situations

noted

above

the

recommended

practice

use

three

IFCV

relays

one

per

phase

three

single

phase

distance

units

plus

timer

many

cases

especially

larger

machines

negative

sequence

time

overcurrent

relay

Type

INC

SGC

installed

provide

back

protection

against

unbalanced

system

faults

such

cases

single

Type

IFCV

relay

protect

against

balanced

system

faults

could

considered

minimum

requirement

some

applications

may

advantageous

use

voltage

controlled

Type

IFCS

relay

rather

than

IFCV

The

IFCV

can

provide

faster

back

protection

than

the

IFCS

particularly

instances

where

the

generator

voltage

does

not

drop

significantly

below

rated

voltage

during

fault

conditions

the

other

hand

the

generator

voltage

always

drops

below

the

setting

the

undervoltage

unit

the

IFCS

for

all

faults

for

which

the

generator

back

required

operate

better

sensitivity

can

obtained

using

the

IFCS

rather

than

the

IFCV

The

current

source

for

Type

IFCV

relays

should

current

transformers

the

neutral

end

the

generator

windings

when

such

are

available

With

these

connections

addition

external

fault

back

protection

the

relays

will

provide

generator

fault

back

protection

even

the

generator

breaker

open

there

are

other

sources

generation

the

system

the

neutral

are

not

available

then

will

necessary

use

line

side

With

these

connections

Type

IFCV

relays

will

operative

fault

back

protection

for

the

generator

only

when

the

generator

breaker

closed

and

there

another

source

generation

the

system

Phase

phase

voltage

should

obtained

from

the

generator

potential

transformers

Loss

potential

the

Type

IFCV

relay

will

cause

the

relay

trip

the

generator

load

current

expressed

relay

secondary

amperes

greater

than

the

pickup

current

the

relay

additional

relay

the

Type

CFVB

available

for

protection

against

false

tripping

due

this

accidental

loss

the

relay

restraint

voltage

The

diagram

Figure

shows

typical

external

connections

for

the

Type

IFCV

relays

when

the

generator

connects

the

bus

generator

voltage

Type

IFCV

relays

are

applied

unit

generator

transformer

installation

the

external

connections

shown

Figure

are

typical

Courtesy of NationalSwitchgear.com

GEK

49946

CALCULATION

SETTINGS

Pickup

with

full

voltage

restraint

the

Type

IFCV

relay

should

generally

set

between

200

and

250

full

load

current

regulated

generators

and

between

150

and

200

full

load

current

unregulated

generators

The

relay

time

setting

determined

system

selectivity

requirements

Though

the

current

decrement

curves

the

generator

must

taken

into

consideration

determine

the

actual

operating

time

the

Type

IFCV

relay

simplifying

assumptions

can

made

which

facilitate

application

the

Type

IFCV

relay

and

yet

maintain

satisfactory

operating

performance

The

maximum

fault

current

condition

for

which

time

current

coordination

must

obtained

should

based

the

transient

reactance

the

generator

the

calculations

are

further

based

the

premise

that

for

bus

fault

the

voltage

presented

the

Type

IFCV

relay

then

the

Type

IFCV

can

coordinated

with

the

bus

and

system

relaying

straight

overcurrent

basis

Coordination

the

Type

IFCV

relay

and

other

system

relays

for

system

faults

where

voltage

will

presented

the

Type

IFCV

relay

thereby

assured

This

conservative

assumption

the

zero

voltage

fault

equally

applicable

the

unit

generator

transformer

case

even

though

the

IFCV

restraint

voltage

may

come

from

generator

potential

transformers

justification

for

this

application

assumption

its

inherent

conservatism

and

the

basic

fact

that

the

operating

characteristic

the

Type

IFCV

relay

fairly

constant

for

all

low

voltage

conditions

The

CONSTRUCTION

The

IFCV

induction

disk

relays

consist

molded

case

cover

support

structure

assembly

and

connection

plug

make

the

electrical

connection

See

cover

figure

and

Figures

and

Figures

and

show

the

induction

unit

mounted

the

molded

support

structure

This

disk

activated

current

operated

coil

mounted

laminated

magnet

and

restrained

voltage

operated

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

proper

contact

closing

and

its

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

The

shorting

bar

engaged

the

current

circuit

fingers

(

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

voltage

circuit

and

current

circuit

fingers

the

case

and

finally

those

the

relay

support

structure

completely

energize

the

drawout

element

Courtesy of NationalSwitchgear.com

GEK

49946

There

High

Seismic

target

and

seal

unit

mounted

the

front

left

the

support

structure

contacts

one

which

series

with

its

coil

and

parallel

with

the

contacts

the

induction

unit

such

that

when

the

induction

unit

contacts

the

seal

unit

picks

and

seals

When

the

seal

unit

picks

raises

target

into

view

which

latches

and

remains

exposed

until

released

presing

button

located

the

upper

left

side

the

cover

The

seal

unit

has

two

electrically

separate

The

IFCV

model

relays

addition

the

above

contain

High

Seismic

instantaneous

unit

(

see

Figure

)

electrically

separate

contacts

and

mounted

the

front

right

the

support

structure

When

the

instantaneous

unit

picks

raises

target

which

latches

and

remains

exposed

until

released

The

same

reset

button

that

releases

the

target

seal

unit

also

releases

the

target

the

instantaneous

unit

The

instantaneous

unit

has

two

Magnetic

shields

depicted

Figure

are

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

Seismic

Fragility

Level

exceeds

peak

axial

acceleration

rate

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

INDUCTION

UNIT

The

current

coil

ratings

are

given

Table

TABLE

AMPERE

TAP

RANGE

TAP

2.5

Continuous

Current

Rating

3.8

4.4

4.9

5.4

6.0

6.5

7.0

7.6

8.1

8.5

The

relay

will

pick

the

tap

value

when

rated

voltage

applied

the

restraint

circuit

pick

trip

value

restraint

voltage

With

voltage

the

restraint

circuit

the

relay

will

Figure

shows

the

pickup

current

required

for

any

The

voltage

restraint

coil

rated

continuously

for

the

nameplate

voltage

rated

frequency

Courtesy of NationalSwitchgear.com

GEK

49946

The

one

second

thermal

ratings

are

listed

Table

TABLE

One

Second

Rating

Any

Tap

(

Amperes

)

Time

Overcurrent

Unit

(

Amperes

)

Model

384

128

IJCV

HIGH

SEISMIC

INSTANTANEOUS

UNIT

The

instantaneous

coil

tapped

for

operation

either

one

two

ranges

(

)

Selection

the

high

low

range

determined

the

position

the

link

located

the

top

the

support

structure

See

Figure

and

Table

III

TABLE

III

Continuous

One

Second

Link

Range

Rating

Position

(

Amps

)

(

Amps

)

(

Amps

)

High

Seismic

Instantaneous

Unit

(

Amps

)

10.2

600

260

150

19.6

150

The

range

approximate

which

means

that

the

150

may

150

There

will

always

least

one

ampere

overlap

between

the

maximum

setting

and

the

minimum

setting

Whenever

possible

sure

select

the

higher

continuous

and

short

time

ratings

Higher

currents

may

applied

for

shorter

lengths

time

accordance

with

the

formula

series

with

the

time

overcurrent

unit

Since

the

instantaneous

unit

coil

see

Tables

and

III

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

TABLE

TAP

0.2

2.0

(

ohms

)

(

amperes

)

(

amperes

)

(

seconds

)

(

seconds

)

(

ohms

)

(

ohms

)

8.3

0.24

Resistance

Minimum

Operating

Carry

Continuously

Carry

amps

for

Carry

amps

for

Hertz

impedance

Hertz

impedance

0.2

2.0

0.37

2.3

0.05

2.2

0.45

0.65

0.54

Courtesy of NationalSwitchgear.com

GEK

49946

the

tripping

currrent

exceeds

amperes

auxiliary

relay

should

used

the

connections

being

such

that

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

INDUCTION

UNIT

The

potential

burdens

rated

voltage

and

rated

frequency

are

given

Table

TABLE

Vol

Volts

Freq

Watts

Vars

Amps

120

9.26

14.4

17.1

17.3

19.7

120

9.43

The

current

circuit

burdens

with

amperes

flowing

the

lowest

tap

are

listed

The

burden

any

other

tap

with

amperes

flowing

approximately

(

Lowest

Tap

Actual

Tap

)

times

the

burden

for

the

lowest

tap

Table

TABLE

Impedance

Ohms

Range

Frequency

Tap

Amp

2.58

77.5

0.43

66.5

0.43

3.10

HIGH

SEISMIC

INSTANTANEOUS

UNIT

The

High

Seismic

instantaneous

unit

burdens

are

listed

Table

VII

TABLE

VII

Burdens

Ohms

(

)

Times

Pickup

Burdens

Min

Pickup

(

Ohms

)

Seismic

Inst

Unit

Link

(

Amps

)

Min

Range

Pickup

Position

(

Amps

)

(

Amps

)

0.110

0.078

0.135

0.095

0.081

0.079

150

0.022

0.005

0.023

0.022

0.092

0.065

0.112

0.079

0.068

0.066

150

0.018

0.004

0.019

0.018

Courtesy of NationalSwitchgear.com

GEK

49946

CHARACTERISTICS

INDUCTION

UNIT

TABLE

VIII

Tap

Connections

1.0

1.25

1.5

3.0

4.0

0.625

2.0

2.5

Zero

Volts

120

Volts

0.5

0.75

10.0

12.0

16.0

6.0

8.0

2.0

2.5

3.0

4.0

5.0

A A A

Taps

F F

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

nameplate

the

relay

for

tap

settings

The

relay

will

pick

tap

value

when

rated

voltage

applied

the

restraint

circuit

With

voltage

the

restraint

circuit

the

relay

will

pick

tap

value

Figure

shows

typical

pickup

current

required

for

any

given

value

restraint

voltage

Pickup

affected

the

phase

angle

the

fault

current

typical

phase

angle

characteristic

shown

Figure

Operating

Time

Accuracy

The

IFCV

relays

should

operate

within

0.050

second

whichever

greater

Figures

and

show

the

time

current

characteristics

for

IFCV

relays

The

setting

the

time

dial

determines

the

length

time

required

the

contacts

for

given

current

The

higher

the

time

dial

setting

the

longer

the

operating

time

The

contacts

are

just

closed

when

the

time

dial

set

setting

occurs

when

the

time

dial

set

and

the

disk

has

travel

Its

maximum

distance

the

contacts

The

maximum

time

HIGH

SEISMIC

INSTANTANEOUS

UNIT

The

instantaneous

unit

has

range

with

tapped

coil

low

ranges

selected

means

link

located

the

top

the

support

structure

See

Figure

HIGH

SEISMIC

TARGET

AND

SEAL

UNIT

There

are

high

and

The

time

current

curve

for

the

instantaneous

unit

shown

The

target

and

seal

unit

has

two

tap

selections

located

the

front

the

unit

See

Figure

Courtesy of NationalSwitchgear.com

GEK

49946

RECEIVING

HANDLING

AND

STORAGE

These

relays

when

not

included

part

control

panel

will

shipped

cartons

designed

protect

them

against

damage

relay

examine

for

any

damage

sustained

transit

resulting

from

rough

handling

evident

file

damage

claim

once

with

the

transportation

company

and

promptly

notify

the

nearest

General

Electric

Sales

Office

Immediately

upon

receipt

injury

damage

Reasonable

care

should

exercised

unpacking

the

relay

order

that

none

the

parts

are

injured

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

the

case

may

find

its

way

inside

when

the

cover

removed

and

cause

trouble

the

operation

the

relay

ACCEPTANCE

TESTS

Immediately

upon

recept

the

relay

Inspection

and

Acceptance

Test

should

made

insure

that

damage

has

been

sustained

shipment

and

that

the

relay

calibrations

have

not

been

disturbed

readjustment

necessary

refer

the

section

SERVICING

Since

operating

companies

use

different

procedures

for

Acceptance

and

Installation

Tests

the

following

section

includes

all

applicable

tests

that

may

performed

these

relays

These

tests

may

performed

part

the

Installation

ofv

the

Acceptance

Tests

the

discretion

the

user

the

examination

test

indicates

that

VISUAL

INSPECTION

Check

the

nameplate

insure

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

spring

not

deformed

nor

its

convolutions

tangled

touching

each

other

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

seal

and

the

instantaneous

contacts

Courtesy of NationalSwitchgear.com

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