ABB CRN-1 Manual

Instruction

Leaflet

ABB

Power

TAD

Company

Inc

Relay

Division

Coral

Springs

33065

Aim

251.21

Type

CRN

Reverse

Power

Relay

(

and

for

Class

Applications

)

Effective

March

1996

Supersedes

251.21

dated

January

1984

(

)

Denotes

Change

Since

Issue

The

type

CRN

relay

single

phase

directionally

controlled

timing

relay

used

protect

generators

from

motoring

When

such

condition

occurs

and

persists

for

predetermined

time

interval

the

gener

ator

may

tripped

alarm

sounded

The

CRN

may

also

used

sense

lagging

power

factor

load

flow

abnormal

direction

The

direc

tional

unit

has

deg

maximum

torque

characteris

tics

and

the

timer

unit

adjustable

from

approximately

seconds

These

instructions

are

supplementary

251.2

and

relate

type

CRN

Relays

which

are

recommended

for

Class

applica

tions

Refer

251.2

for

details

con

struction

and

operation

this

relay

CAUTION

Before

putting

relays

into

service

remove

all

blocking

which

may

have

been

inserted

for

the

purpose

securing

the

parts

during

ship

ment

make

sure

that

all

moving

parts

operate

freely

inspect

the

contacts

see

that

they

are

clean

and

properly

and

operate

the

relay

check

the

settings

and

electrical

connec

tions

CONSTRUCTION

AND

OPERATION

Certain

units

these

relays

have

been

specially

designed

meet

the

fragility

requirements

seis

mic

environment

most

cases

the

construction

similar

the

non

seismic

units

except

spring

restraint

greater

and

therefore

power

required

make

them

operate

The

timer

unit

similar

Type

relay

described

201.4

APPLICATION

These

relays

have

been

specially

designed

and

tested

establish

their

suitability

for

Class

appli

cations

accordance

with

the

ABB

Power

Company

program

for

Class

Qualification

Testing

detailed

bulletin

STR

The

units

contain

special

shield

covering

the

spring

located

above

the

disc

prevent

the

spring

from

contacting

grounded

elements

during

extreme

vibrations

The

ICS

has

single

operate

rating

and

requires

special

calibration

procedures

make

less

sensi

tive

vibration

The

internal

schematic

the

CRN

shown

figure

“

Class

”

the

safety

classification

the

electric

equipment

and

systems

nuclear

power

generating

stations

that

are

essential

emergency

shutdown

the

reactor

containment

isolation

cooling

the

reactor

and

heat

removal

from

the

containment

and

reactor

otherwise

are

essential

preventing

sig

nificant

release

radioactive

material

the

environ

ment

2.1

UNIT

spring

shield

covers

the

reset

spring

the

unit

remove

the

spring

shield

requires

that

the

damp

All

possible

contingencies

which

may

arise

during

installation

operation

maintenance

and

all

details

and

variations

this

equipment

not

purport

covered

these

instructions

further

information

desired

purchaser

regarding

this

particular

installation

operation

maintenance

this

equipment

the

local

ABB

Power

Company

Inc

representative

should

contacted

Courtesy of NationalSwitchgear.com

251.21

fingers

not

touch

the

yoke

the

reset

position

(

viewed

from

top

switch

between

cover

and

frame

)

This

can

done

loosening

the

mounting

screw

the

molded

pedestal

and

moving

the

ICS

the

downward

position

ing

magnet

removed

first

The

screw

connection

holding

the

lead

the

moving

contact

should

removed

The

second

screw

holding

the

moving

contact

assembly

should

then

loosened

not

removed

(

CAUTION

this

screw

terminates

into

nut

held

captive

beneath

the

molded

block

screw

removed

difficulty

will

experienced

the

reassembly

the

moving

contact

assem

bly

)

Slide

the

spring

shield

outward

and

remove

from

relay

Tighten

the

screw

holding

the

moving

con

tact

assembly

the

molded

block

Contact

Wipe

Adjust

the

stationary

contact

that

both

stationary

contacts

make

with

the

mov

ing

contacts

simultaneously

and

wipe

’

when

the

armature

against

the

core

Target

Manually

raise

the

moving

contacts

and

check

see

that

the

target

drops

the

same

time

the

contacts

make

”

ahead

The

cover

may

removed

and

the

tab

holding

the

target

reformed

slightly

necessary

How

ever

care

should

exercised

that

the

target

will

not

drop

with

slight

jar

2.2

INDICATING

CONTACTOR

SWITCH

(

ICS

)

2.2

Rating

Ampere

Pickup

Ohms

Resistance

0.2

8.5

1.0

0.37

2.0

0.10

Pickup

The

unit

should

pickup

rating

and

not

pickup

rating

necessary

the

cover

leaf

springs

may

adjusted

lower

the

pickup

current

use

tweezer

similar

tool

and

squeeze

each

leaf

spring

approximately

equal

applying

the

tweezer

between

the

leaf

spring

and

the

front

surface

the

cover

the

bottom

the

lower

window

2.2

Settings

There

are

settings

make

the

indicating

con

tactor

switch

(

ICS

)

2.2

Routine

Check

the

main

relay

contacts

and

pass

sufficient

current

through

the

trip

circuit

the

contacts

the

ICS

This

value

current

should

not

greater

than

the

particular

ICS

nameplate

rating

The

indica

tor

target

should

drop

freely

the

pickup

low

the

front

cover

must

removed

and

the

leaf

spring

bent

outward

equally

RENEWAL

PARTS

Repeat

above

except

pass

ICS

nameplate

rating

current

Contacts

should

not

pickup

and

target

should

not

drop

Repair

work

can

done

most

satisfactorily

the

factory

However

interchangeable

parts

can

fur

nished

the

customers

who

are

equipped

for

doing

repair

work

When

ordering

parts

always

give

the

complete

nameplate

data

2.2

Adjustment

and

Calibration

Initially

adjust

unit

the

pedestal

that

armature

Courtesy of NationalSwitchgear.com

251.21

RELAY

TYPE

CRN

REVERSE

POWER

SINGLE

TRIP

TYPE

CASE

(

FOR

CLASS

APPLICATION

)

INTERNAL

SCHEMATIC

TIMER

UNIT

INDICATING

CONTACTOR

SWITCH

ICS

DIRECTIONAL

UNIT

jicsjcv

CHASSIS

OPERATED

SHORTING

SWITCH

RED

HANDLE

TEST

SWITCH

CURRENT

TEST

JACK

©©

TERMINAL

FRONT

VIEW

WITH

RELATIVE

INSTANTANEOUS

POLARITY

SHOWN

THE

DIRECTIONAL

CONTACTS

Sub

3528

Figure

Internal

Schematic

the

Type

CRN

Relay

Courtesy of NationalSwitchgear.com

CRSE

OUTLINE

594

(

40.49

)

063

(

154.00

)

569

(

14.30

)

219

(

132.56

)

10.438

(

265.13

)

SEMI

FLUSH

MTG

PflNEL

LOCHTION

3.168

(

80.98

)

6.375

(

161.93

)

HOLES

FOR

190

MTG

SCREWS

250

DIR

(

6.35

)

5.563

(

141.30

)

2.781

(

70.64

)

CRSE

LRRGE

INTERNRL

RND

EXTERNRL

TOOTH

WRSHER

190

SCREW

9.688

(

246.08

)

9.063

(

230.20

)

4.531

(

115.09

)

SMFLL

EXTERNRL

TOOTH

NRSKER

4.844

(

123.04

)

125

(

3.18

)

2.938

(

74.63

)

5.875

(

149.23

)

PBNn

PRILLING

AND

CUTOUT

FOR

SEMI

FLUSH

MTG

Sub

3519

Figure

Outline

and

Drilling

Plan

for

the

Type

CRN

Relay

Type

Case

MPIP

ABB

Network

Partner

ABB

Power

Company

Inc

4300

Coral

Ridge

Drive

Coral

Springs

Florida

33065

954

752

6700

FAX

954

345

5329

Printed

Courtesy of NationalSwitchgear.com

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