ABB CRN-1 Manual

Instruction

Leaflet

I

.

L

.

41

-

251.2

P

All

II

m

»

ip

ABB

Power

T

&

D

Company

Inc

.

Relay

Divisions

Coral

Springs

,

FL

33065

Type

CRN

-

1

Reverse

Power

Relay

50

and

60

Hertz

Effective

:

June

1991

Supersedes

I

.

L

41

-

251.2

N

Dated

April

1988

(

|

)

Denotes

Change

Since

2.2

Directional

Unit

(

D

)

The

directional

unit

is

a

product

induction

cylinder

type

unit

operating

on

the

interaction

between

the

polarizing

circuit

flux

and

the

operating

circuit

flux

.

Mechanically

,

the

directional

unit

is

composed

of

four

basic

components

:

a

die

-

cast

aluminum

frame

,

an

electromagnet

,

a

moving

element

assembly

,

and

a

molded

bridge

.

The

frame

serves

as

the

mounting

structure

for

the

magnetic

core

.

The

magnetic

core

which

houses

the

lower

bearing

is

secured

to

the

frame

by

a

locking

nut

.

The

bearing

can

be

replaced

,

if

necessary

,

with

-

out

having

to

remove

the

magnetic

core

from

the

frame

.

The

electromagnet

has

two

series

-

connected

polariz

-

ing

coils

mounted

diametrically

opposite

one

another

;

two

series

-

connected

operating

coils

mounted

dia

-

metrically

opposite

one

another

;

and

two

locating

pins

.

The

locating

pins

are

used

to

accurately

posi

-

tion

the

lower

bearing

,

which

is

mounted

on

the

frame

,

with

respect

to

the

upper

bearing

,

which

is

threaded

into

the

bridge

.

The

electromagnet

is

secured

to

the

frame

by

four

mounting

screws

.

The

moving

element

assembly

consists

of

a

spiral

spring

,

contact

carrying

member

,

and

an

aluminum

cylinder

assembled

to

a

molded

hub

which

holds

the

shaft

.

The

shaft

has

removable

top

and

bottom

jewel

bearings

.

The

shaft

rides

between

the

bottom

bearing

and

the

upper

bearing

with

the

cylinder

rotating

in

an

air

gap

formed

by

the

electromagnet

and

the

magnetic

core

.

The

stops

for

the

moving

ele

-

ment

contact

arm

are

an

integral

part

of

the

bridge

.

The

bridge

is

secured

to

the

electromagnet

and

frame

by

two

mounting

screws

.

In

addition

to

holding

CAUTION

Before

putting

relays

into

service

,

remove

all

blocking

which

may

have

been

inserted

for

the

purpose

of

securing

the

parts

during

shipment

,

make

sure

that

all

moving

parts

operate

freely

,

inspect

the

contacts

to

see

that

they

are

clean

and

close

properly

,

and

operate

the

relay

to

check

the

settings

and

electrical

connections

.

1

.

APPLICATION

The

type

CRN

-

1

relay

is

a

single

phase

directionally

controlled

timing

relay

used

to

protect

ac

generators

from

motoring

.

When

such

a

condition

occurs

and

persists

for

a

predetermined

time

interval

,

the

gener

-

ator

may

be

tripped

or

an

alarm

sounded

.

The

CRN

-

1

may

also

be

used

to

sense

lagging

power

factor

load

flow

in

an

abnormal

direction

as

shown

in

Figure

6

.

The

directional

unit

has

30

°

maximum

torque

char

-

acteristics

and

the

timer

unit

is

adjustable

from

approximately

2

to

40

seconds

.

2

.

CONSTRUCTION

The

relay

consists

of

a

directional

unit

,

a

timing

unit

,

and

an

indicating

contactor

switch

unit

.

2.1

Timer

Unit

(

T

)

The

timer

unit

operates

on

the

induction

-

disc

princi

-

ple

.

A

main

coil

located

on

the

center

leg

of

an

“

E

”

type

laminated

structure

produces

a

flux

which

divides

and

returns

through

the

outer

legs

.

A

shading

coil

causes

the

flux

through

the

left

leg

(

front

view

)

to

lag

the

main

pole

flux

.

The

out

-

of

-

phase

fluxes

thus

produced

in

the

air

gap

causes

a

contact

closing

torque

.

It

is

similar

to

a

non

-

tapped

version

of

the

voltage

unit

of

the

CV

Relay

(

see

I

.

L

.

41

-

201

)

.

All

possible

contingencies

which

may

arise

during

installation

,

operation

or

maintenance

,

and

all

details

and

variations

of

this

equipment

do

not

purport

to

be

covered

by

these

instructions

.

If

further

information

is

desired

by

purchaser

regarding

this

particular

installation

,

operation

or

maintenance

of

this

equipment

,

the

local

Asea

Brown

Boveri

representative

should

be

contacted

.

Printed

in

U

.

S

.

A

.

Courtesy of NationalSwitchgear.com

I

.

L

.

41

-

251.2

P

Figure

1

.

Type

CRN

-

1

Relay

Without

Case

.

1

=

Directional

Unit

(

D

)

.

2

=

Timer

Unit

(

T

)

.

3

=

Indicating

Contac

-

tor

Switch

(

ICS

)

.

INTERNAL

SCHEMATIC

rfUNAL

KMOunc

•

TIMER

UNIT

lima

wit

•

OlCAIlBO

cot

ne

IOI

"

1

*

1

IC

8

DIRECTIONAL

UNIT

OiUCTIOBAL

wit

I

Cl

T

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a

y

.

D

0

9

until

oniitia

UOtllit

lailtj

'

T

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CHASSIS

OPERATED

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SWITCH

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.

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JACI

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"

9

~

’

<

-

RED

HANDLE

TEST

SWITCH

CURRENT

TEST

JACK

.

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|

9

99

0

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FRONT

VIEW

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*

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IIIIUTUIOUI

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UCH

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Tit

ontctiftm

ttiucu

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.

Sub

4

184

A

404

WITH

RELATIVE

INSTANTANEOUS

POLARITY

AS

SHOWN

,

THE

DIRECTONAL

CONTACTS

CLOSE

.

Figure

2

a

.

Internal

Schematic

of

the

Single

Trip

Type

CRN

-

1

Relay

Without

ICS

Unitin

the

FT

-

21

CAse

.

Figure

2

.

Internal

Schematic

of

the

Single

Trip

Type

CRN

-

1

Relay

in

the

FT

-

21

Case

.

2

Courtesy of NationalSwitchgear.com

i

.

L

.

41

-

251.2

P

ttfTtJMUl

mCHJTlC

•

*

60

T

:

I

105

VOLTS

TIHU

KBIT

55

1

UJlCilUC

CO

*

TICI

0

(

STMltB

1

50

ICS

T

O

45

S

40

oiucnoRii

UKIT

90

VOLTS

z

120

VOLTS

T

ICS

r

-

XJ

.

7

Ui

to

T

35

-

v

z

UJ

30

i

”

|

2

°

15

X

125

VOLTS

1

D

0

T

!

1

CHASSIS

OMIAICP

JnOtriiO

SilTCH

T

MO

HA

»

81

E

•

TEST

SWITCH

CUAUar

TEST

JACI

\

o

”

6

”

9

"

'

"

9

*

"

o

’

"

'

o

"

'

6

I

10

©

,

©

'

O

6

0

.

®

/

6

5

7

(

TE

«

Ml

»

U

.

I

23456789

1 0

I I

moot

view

Sub

1

184

A

547

Sub

3

184

A

405

a

*

me

IBSTABTAMOSIS

fOUAI

IT

AS

SHOVK

.

THE

PLMGTLOBAL

COaTACTS

CLOSE

im

i

TIME

DIAL

POSITION

Figure

4

.

Typical

Time

Curves

of

the

Timer

Unit

of

the

120

volt

Type

CRN

-

1

Relay

.

Propor

-

tional

voltages

apply

for

the

208

and

240

volt

relay

.

The

front

spring

,

in

addition

to

holding

the

target

,

pro

-

vides

restrain

for

the

armature

and

thus

controls

the

pickup

value

of

the

switch

.

3

.

CHARACTERISTICS

The

type

CRN

-

1

relay

is

available

with

either

a

120

,

208

,

or

240

volt

rating

.

3.1

Timer

Unit

(

T

)

The

timer

unit

is

rated

at

120

,

208

or

240

volts

,

60

hertz

.

The

minimum

operate

value

is

54

%

of

rated

voltage

.

The

continuous

overvoltage

capability

is

110

%

of

rated

voltage

.

Characteristic

time

curves

are

shown

in

Figure

4

for

various

voltages

and

time

dial

settings

.

3.2

Directional

Unit

(

D

)

The

directional

unit

has

its

maximum

torque

when

the

current

leads

the

voltage

by

30

°

.

The

relay

should

be

connected

using

the

30

°

connection

.

When

using

this

connection

the

maximum

torque

of

the

relay

occurs

at

100

%

P

.

F

.

The

pickup

value

is

.

02

amp

at

rated

voltage

and

maximum

torque

angle

.

The

pickup

may

be

increased

to

.

05

amp

or

higher

by

increasing

the

spring

tension

.

3.3

Trip

Circuit

The

main

contacts

will

safely

dose

30

amperes

at

250

volts

dc

and

the

seal

-

in

contacts

of

the

indicating

contactor

switch

will

safely

carry

this

current

long

enough

to

trip

a

circuit

breaker

.

Figure

3

.

Internal

Schematic

of

the

Double

Trip

Type

CRN

-

1

Relay

in

the

FT

-

21

Case

.

the

upper

bearing

,

the

bridge

is

used

for

mount

-

ing

the

adjustable

stationary

contact

housing

.

The

stationary

contact

housing

is

held

in

position

by

a

spring

type

clamp

.

The

spring

adjuster

is

located

on

the

underside

of

the

bridge

and

is

attached

to

the

moving

contact

arm

by

a

spiral

spring

.

The

spring

adjuster

is

also

held

in

place

by

a

spring

type

clamp

.

With

the

contacts

closed

,

the

electrical

connection

is

made

through

the

stationary

contact

housing

clamp

,

to

the

moving

contact

,

through

the

spiral

spring

out

to

the

spring

adjuster

clamp

.

The

timer

unit

cannot

be

energized

unless

the

power

flow

is

in

the

tripping

direction

because

its

potential

coil

is

connected

in

series

with

the

contacts

of

the

directional

unit

.

Hence

,

the

relay

is

directionally

con

-

trolled

.

2.3

Indicating

Contactor

Switch

unit

(

ICS

)

The

dc

indicator

contactor

switch

is

a

small

clapper

type

device

.

A

magnetic

armature

,

to

which

leaf

-

spring

mounted

contacts

are

attached

,

is

attracted

to

the

magnetic

core

upon

energizing

of

the

switch

.

When

the

switch

closes

,

the

moving

contacts

bridge

two

stationary

contacts

,

completing

the

trip

circuit

.

Also

during

this

operation

two

fingers

on

the

arma

-

ture

deflect

a

spring

located

on

the

front

of

the

switch

,

which

allows

the

operation

indicator

target

to

drop

.

The

target

is

reset

from

the

outside

of

the

case

by

a

push

rod

located

at

the

bottom

of

the

cover

.

3

Courtesy of NationalSwitchgear.com

I

.

L

.

41

-

251.2

P

The

indicating

contactor

switch

has

two

taps

that

pro

-

vide

a

pickup

setting

of

0.2

to

2

amperes

.

To

change

taps

requires

connecting

the

lead

located

in

front

of

the

tap

block

to

the

desired

setting

by

means

of

a

screw

connection

.

For

detail

information

on

the

FT

case

refer

to

I

.

L

.

41

-

076

.

For

correct

operation

,

the

type

CRN

-

1

relay

should

be

connected

so

that

maximum

torque

occurs

for

unity

power

factor

on

the

system

.

Since

the

direc

-

tional

unit

has

a

30

°

characteristic

,

this

may

be

accomplished

by

using

the

connections

shown

in

Figure

5

.

The

voltage

operated

timer

unit

should

be

connected

across

the

line

.

External

schematic

for

this

applica

-

tion

as

shown

in

Figure

5

.

6

.

ADJUSTMENTS

AND

MAINTENANCE

The

proper

adjustments

to

insure

correct

operation

of

this

relay

have

been

made

at

the

factory

and

should

not

be

disturbed

after

receipt

by

the

customer

.

If

the

adjustments

have

been

changed

,

the

relay

taken

apart

for

repairs

,

or

if

it

is

desired

to

check

the

adjust

-

ments

at

regular

maintenance

periods

,

the

instruc

-

tions

in

Section

6.1

,

“

Acceptance

Check

”

should

be

followed

.

All

contacts

should

be

cleaned

periodically

.

A

contact

burnisher

Style

#

182

A

836

H

01

is

recommended

for

this

purpose

.

The

use

of

abrasive

material

for

clean

-

ing

contacts

is

not

recommended

,

because

of

the

danger

of

embedding

small

particles

in

the

face

of

the

soft

silver

and

thus

impairing

the

contact

.

6.1

Acceptance

Check

The

following

check

is

recommended

to

insure

that

the

relay

is

in

proper

working

order

.

a

.

Timer

Unit

(

T

)

The

directional

unit

contacts

must

be

in

the

closed

position

when

checking

the

operation

of

the

timer

unit

.

b

.

Contact

By

turning

the

time

dial

,

move

the

moving

con

-

tacts

until

they

deflect

the

stationary

contact

to

a

position

where

the

stationary

contact

is

resting

against

its

backstop

.

The

index

mark

located

on

the

movement

frame

should

coincide

with

the

“

O

”

mark

on

the

time

dial

.

For

double

trip

relays

,

the

follow

on

the

stationary

contacts

should

be

approximately

1

/

64

”

.

For

relays

identified

with

a

“

T

,

located

at

lower

left

of

stationary

contact

block

,

the

index

mark

on

the

movement

frame

will

coincide

with

the

“

O

”

mark

on

the

time

dial

when

the

stationary

contact

has

moved

through

approximately

one

-

half

of

its

3.4

Trip

Circuit

Constant

Indicating

Contact

Switch

(

ICS

)

0.2

ampere

tap

6.5

ohms

dc

resistance

2.0

amperes

tap

0.15

ohm

dc

resistance

4

.

SETTINGS

There

is

only

one

setting

to

be

determined

.

This

is

the

time

delay

of

the

voltage

operated

timer

,

and

it

is

adjusted

by

the

time

dial

position

.

Figure

4

gives

a

curve

of

time

delay

vs

.

time

dial

setting

for

various

impressed

voltages

.

Time

is

approximately

propor

-

tional

to

time

dial

setting

.

4.1

Indicating

Contactor

Switch

(

ICS

)

No

setting

is

required

on

the

ICS

unit

except

the

selection

of

the

0.2

or

2.0

amperes

tap

setting

.

This

selection

is

made

by

connecting

the

lead

located

in

front

of

the

tap

block

to

the

desired

setting

by

means

of

the

connecting

screw

.

When

the

relay

energizes

a

125

or

250

volt

dc

type

WL

relay

switch

,

or

equiva

-

lent

,

use

the

0.2

ampere

tap

.

5

.

INSTALLATION

The

relays

should

be

mounted

on

switchboard

pan

-

els

or

their

equivalent

in

a

location

free

from

dirt

,

moisture

,

excessive

vibration

and

heat

.

Mount

the

relay

vertically

by

means

of

the

rear

mounting

stud

or

studs

for

the

type

FT

projection

case

or

by

means

of

the

four

mounting

holes

on

the

flange

for

the

semi

-

flush

type

FT

case

.

Either

the

stud

or

the

mounting

screws

may

be

utilized

for

grounding

the

relay

.

Exter

-

nal

toothed

washers

are

provided

for

use

in

the

loca

-

tions

shown

on

the

outline

and

drilling

plan

to

facilitate

making

a

good

electrical

connection

between

the

relay

case

,

its

mounting

screws

or

studs

,

and

the

relay

panels

.

Ground

wires

are

affixed

to

the

mounting

screws

or

studs

as

required

for

poorly

grounded

or

insulating

panels

.

Other

electrical

connections

may

be

made

directly

to

the

terminals

by

means

of

screws

for

steel

panel

mounting

or

to

the

terminal

stud

furnished

with

the

relay

for

thick

panel

mounting

.

The

terminal

stud

may

be

easily

removed

or

inserted

by

locking

two

nuts

on

the

stud

and

then

turning

the

proper

nut

with

a

wrench

.

4

Courtesy of NationalSwitchgear.com

I

.

L

.

41

-

251.2

P

RELAY

TRIPS

FOR

POWER

FLOW

IN

THIS

DIRECTION

-

^

A

PHASE

ROTATION

A

,

B

,

C

D

.

C

.

TRIP

BUS

A

POS

.

32

B

10

o

NOTE

-

GROUNO

MAY

BE

SUBSTITUTED

FOR

EITHER

LOW

SIOE

FUSE

.

ICS

_

[

ics

J

32

>

T

_

J

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£

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a

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TC

NEC

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DIRECTIONAL

TIMING

UNIT

DEVICE

NUMBER

CHART

32

-

REVERSE

POWER

RELAY

TYPE

CRM

-

1

3

Z

-

D

-

DIRECTIONAL

ELEMENT

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CRN

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32

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LINE

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Sub

5

184

A

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Figure

5

.

External

Schematic

of

the

Type

CRN

-

1

for

Reverse

Power

Protection

.

TRIP

DIRECTION

ABC

GENERATION

—

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±

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ROTATION

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,

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UTILITY

P

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32

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NUMBER

CHART

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DIRECTIONAL

UNIT

\

.

IA

v

\

MAX

TORQUE

WHENIA

f

A

\

/

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VBC

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—

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-

REVERSE

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RELAY

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-

1

32

-

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-

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-

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32

-

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-

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OF

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COIL

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a

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0

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v

8

VC

\

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TORQUE

Sub

5

849

A

137

LINE

\

NEG

\

Figure

6

.

External

Schematic

of

the

CRN

-

1

Relay

to

Prevent

Reverse

Magnetization

When

Utility

Tie

is

Removed

From

the

Local

System

.

5

Courtesy of NationalSwitchgear.com

I

.

L

.

41

-

251.2

P

normal

deflection

.

Therefore

,

with

the

stationary

contact

resting

against

the

backstop

,

the

index

mark

is

offset

to

the

right

of

the

“

O

”

mark

by

approximately

.

020

”

.

The

placement

of

the

vari

-

ous

time

dial

positions

in

line

with

the

index

mark

will

give

operating

times

as

shown

on

the

respec

-

tive

time

-

voltage

curves

.

For

double

trip

relays

,

the

follow

on

the

stationary

contacts

should

be

approximately

1

/

32

”

.

c

.

Minimum

Operate

Voltage

Set

the

time

dial

to

position

6

.

Alternately

apply

54

%

of

rated

voltage

plus

3

%

and

minus

3

%

.

The

moving

contact

should

leave

the

backstop

at

plus

3

%

and

should

return

to

the

backstop

at

minus

3

%

.

6.1

.

2

Directional

Unit

(

D

)

a

Contact

Gap

The

gap

between

the

stationary

contact

and

moving

contact

with

the

relay

in

a

de

-

energized

position

should

be

approximately

.

022

”

.

b

.

Sensitivity

The

respective

directional

units

should

trip

with

value

of

energization

and

phase

angle

relation

-

ships

as

indicated

in

Table

1

.

The

pickup

may

be

increased

to

.

05

amp

or

higher

by

increasing

the

spring

tension

.

6.2

Routine

Maintenance

All

relays

should

be

inspected

periodically

and

the

time

of

operation

should

be

checked

at

least

once

every

year

or

at

such

other

time

intervals

as

may

be

dictated

by

experience

to

be

suitable

to

the

particular

application

.

Phantom

loads

should

not

be

used

in

testing

induction

-

type

relays

because

of

the

resulting

distorted

current

wave

form

which

produces

an

error

in

timing

.

d

.

Time

Curve

Figure

4

shows

the

time

curve

for

the

CRN

-

1

relay

.

With

the

time

dial

set

to

the

indicated

posi

-

tion

,

apply

the

voltages

specified

and

measure

the

operating

time

of

the

relay

.

The

operating

times

should

equal

those

of

Figure

4

plus

or

minus

5

%

.

All

contacts

should

be

periodically

cleaned

.

A

contact

burnisher

Style

#

182

A

836

H

01

is

recommended

for

this

purpose

.

The

use

of

abrasive

material

for

clean

-

ing

contacts

is

not

recommended

,

because

of

the

danger

of

embedding

small

particles

in

the

face

of

the

soft

silver

and

thus

impairing

the

contact

.

6.1

.

1

Indicating

Contactor

Switch

(

ICS

)

Close

the

main

relay

contacts

and

pass

sufficient

dc

current

through

the

trip

circuit

to

close

the

contacts

of

the

ICS

.

This

value

of

current

should

not

be

greater

than

the

particular

ICS

tap

setting

being

used

.

The

indicator

target

should

drop

freely

.

6.3

Calibration

Use

the

following

procedure

for

calibrating

the

relay

if

the

relay

has

been

taken

apart

for

repairs

or

the

adjustments

have

been

disturbed

.

This

procedure

should

not

be

used

unless

it

is

apparent

that

the

relay

is

not

in

proper

working

order

.

(

See

Section

6.1

,

“

Acceptance

Check

”

)

.

The

contact

gap

should

be

approximately

.

047

between

the

bridging

moving

contact

and

the

adjust

-

able

stationary

contacts

.

The

bridging

moving

con

-

tact

should

touch

both

stationary

contacts

simultaneously

.

TABLE

1

DIRECTIONAL

UNIT

SENSITIVITY

Values

for

Min

.

Pick

-

up

1

,

Amperes

Relay

Type

Ratings

Volts

Phase

Angle

Relationship

Volts

I

leading

V

by

30

°

t

1

,

I

In

-

phase

with

V

.

CRN

-

1

120

,

208

,

240

Rated

.

020

.

023

I

^

The

energization

quantities

are

input

quantities

at

the

relay

terminals

.

ft

Maximum

torque

angle

.

6

Courtesy of NationalSwitchgear.com

I

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L

.

41

-

251.2

P

6.4

Minimum

Operate

Voltage

The

adjustment

of

the

spring

tension

in

setting

the

minimum

operate

voltage

of

the

relay

is

most

conve

-

niently

made

with

the

damping

magnet

removed

.

Close

the

directional

contacts

.

With

the

time

dial

set

on

“

O

”

,

wind

up

the

spiral

spring

by

means

of

the

spring

adjuster

until

approxi

-

mately

6

3

/

4

convolutions

show

.

Set

the

relay

dial

to

position

6

.

Adjust

the

control

spring

tension

so

that

the

moving

contact

will

leave

the

backstop

at

65

volts

+

1.0

%

and

will

return

to

the

backstop

at

65

volts

-

1.0

%

.

This

value

is

for

the

120

volt

relay

.

Proportional

voltage

apply

for

the

208

and

240

volt

relay

.

6.5

Time

Curve

Calibration

Install

the

permanent

magnet

.

Set

the

time

dial

to

position

#

11

.

Apply

rated

voltage

to

terminals

6

and

7

with

the

directional

contacts

closed

.

Adjust

the

permanent

magnet

keeper

until

the

operating

time

is

40

seconds

±

3

%

.

6.6

Indicating

Contactor

Switch

-

Unit

(

ICS

)

Close

the

main

relay

contacts

and

pass

sufficient

dc

current

through

the

trip

circuit

to

close

the

contacts

of

the

ICS

.

This

value

of

current

should

be

not

greater

than

the

particular

ICS

tap

setting

being

used

.

The

indicator

target

should

drop

freely

.

6.7

Directional

Unit

(

D

)

The

upper

bearing

should

be

screwed

down

until

there

is

approximately

.

025

”

clearance

between

it

and

the

top

of

shaft

bearing

.

The

upper

bearing

should

then

be

securely

locked

in

position

with

the

locknut

.

The

lower

bearing

position

is

fixed

and

can

-

not

be

adjusted

.

The

contact

gap

adjustment

for

the

directional

unit

is

made

as

follows

:

With

the

moving

contact

in

the

normally

opened

posi

-

tion

,

i

.

e

.

,

against

the

right

stop

on

bridge

,

screw

in

the

stationary

contact

until

both

contacts

just

close

as

indicated

by

a

neon

lamp

in

the

contact

circuit

.

Then

,

screw

the

stationary

contact

away

from

the

moving

contacts

3

/

4

of

a

turn

.

The

clamp

holding

the

stationary

contact

housing

need

not

be

loosened

for

the

adjustment

since

the

clamp

utilizes

a

spring

-

type

action

in

holding

the

sta

-

tionary

contact

in

position

.

Tl

«

l

HOTS

Mil

kill

.

HUT

CMTACT

OPCIS

TIMCI

STOP

AM

.

KCUT

—

*

1

TO

f

UNO

ST

AITS

>

TIMCI

<

MCI

MlTCM

r

-

*

»

I

STAIT

i

*

S

"

CLOUS

%

f

J

Cl

1

-

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I

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(

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)

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CLOSED

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$

T

1

TICS

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J

ooopi

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1

.

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)

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POTClTlOCTU

TEST

SIITCI

A

.

C

.

SSPPLT

Sub

2

184

A

368

Figure

7

.

Test

Connections

for

the

Timer

Unit

of

the

Type

CRN

-

1

Relay

in

the

Type

FT

-

21

Case

.

6.3

.

1

Timer

Unit

(

T

)

a

.

Contact

By

turning

the

time

dial

,

move

the

moving

con

-

tacts

until

they

deflect

the

stationary

contact

to

a

position

where

the

stationary

contact

is

resting

against

its

backstop

.

The

index

mark

located

on

the

movement

frame

should

coincide

with

the

“

O

”

mark

on

the

time

dial

.

For

double

trip

relays

,

the

follow

on

the

stationary

contacts

should

be

approximately

1

/

64

”

.

For

relays

identified

with

a

“

T

”

,

located

at

lower

left

of

stationary

contact

block

,

the

index

mark

on

the

movement

frame

will

coincide

with

the

“

O

”

mark

on

the

time

dial

when

the

stationary

contact

has

moved

through

approximately

one

-

half

of

its

normal

deflection

.

Therefore

,

with

the

stationary

contact

resting

against

the

backstop

,

the

index

mark

is

offset

to

the

right

of

the

“

O

”

mark

by

approximately

.

020

”

.

The

placement

of

the

vari

-

ous

time

dial

positions

in

line

with

the

index

mark

will

give

operating

times

as

shown

on

the

respec

-

tive

time

-

voltage

curves

.

For

double

trip

relays

,

the

follow

on

the

stationary

contacts

should

be

approximately

1

/

32

”

.

7

Courtesy of NationalSwitchgear.com

I

.

L

.

41

-

251.2

P

polarizing

circuit

is

at

the

maximum

torque

angle

or

when

the

circuit

relationship

has

the

operating

and

polarizing

circuits

in

phase

.

It

is

recommended

that

a

single

phase

(

in

phase

relationship

)

set

-

up

be

used

as

a

matter

of

ease

and

convenience

.

The

set

screw

in

the

stationary

contacts

have

been

factory

adjusted

for

optimum

follow

and

thus

adjust

-

ment

should

not

be

disturbed

.

The

moving

contact

assembly

has

been

factory

adjusted

for

low

contact

bounce

performance

and

should

not

be

changed

.

6.8

Maximum

Torque

Adjustment

Apply

rated

voltage

to

terminals

6

and

7

,

and

4

amperes

to

terminals

8

and

9

,

making

sure

the

polar

-

ities

are

correct

.

With

the

voltage

and

current

in

phase

,

the

contacts

should

close

.

Now

adjust

the

angle

between

current

and

voltage

to

120

°

(

current

leading

the

voltage

)

.

Adjust

the

resistor

to

just

close

the

contacts

.

Contacts

should

open

when

the

angle

between

current

and

voltage

is

120

°

+

1

°

leading

.

The

sensitivity

adjustment

is

made

by

varying

the

tension

of

the

spiral

spring

attached

to

the

moving

element

assembly

.

The

spring

is

adjusted

by

placing

a

screwdriver

or

similar

tool

into

one

of

the

notches

located

on

the

periphery

of

the

spring

adjuster

and

rotating

it

.

The

spring

adjuster

is

located

on

the

underside

of

the

bridge

and

is

held

in

place

by

a

spring

type

clamp

that

does

not

have

to

be

loosened

prior

to

making

the

necessary

adjustments

.

The

spring

is

to

be

adjusted

such

that

the

contacts

will

close

as

indicated

by

a

neon

lamp

in

the

contact

circuit

when

energized

with

the

required

current

and

voltage

as

shown

in

Table

1

.

This

table

indicates

that

the

spring

can

be

adjusted

when

the

phase

angle

relationship

between

the

operating

circuit

and

the

RATINGS

Circuit

Continuous

Voltage

-

100

%

of

Rating

Current

-

5

Amperes

ENERGY

REQUIREMENTS

The

50

and

60

hertz

burden

of

the

units

of

the

type

CRN

-

1

relay

are

as

follows

:

Volt

*

Power

Burden

at

Amperes

Factor

Coil

Rated

Voltage

6.5

73

°

Timer

Directional

Potential

Rated

Voltage

3.5

Directional

Current

5

Amperes

*

Angle

that

current

lags

the

voltage

60

°

47

°

5.5

7

.

RENEWAL

PARTS

Repair

work

can

be

done

satisfactorily

at

the

factory

.

However

,

interchangeable

parts

can

be

furnished

to

the

customers

who

are

equipped

for

doing

repair

work

,

when

ordering

parts

,

always

give

the

complete

nameplate

data

.

8

Courtesy of NationalSwitchgear.com

PANEL

DRILLING

RND

CUTOUT

FOR

SEMI

-

FLUSH

MTG

.

CASE

OUTLINE

5.563

(

141.30

)

2.781

(

70.64

)

-

6.063

(

154.00

)

1.594

•

(

40.49

)

.

250

DIR

.

(

6.35

)

-

4

HOLES

FOR

.

190

-

32

MTG

.

SCREWS

5.119

(

132.56

)

*

I

f

.

563

(

14.30

)

9.668

(

246.08

)

9.063

(

230.20

)

CRSE

c

\

I

4.844

(

123.04

)

<

n

10.438

(

265.13

)

4.531

(

115.09

)

LARGE

INTERNAL

AND

EXTERNAL

TOOTH

WASHER

190

-

32

SCREW

1

/

1

?

.

n

*

SEMI

-

FLUSH

MTG

.

-

3.188

(

80.98

)

.

125

R

(

3.18

)

M

SMALL

EXTERNAL

TOOTH

WASHER

•

2.938

(

74.63

)

5.875

(

149.23

)

PROJECTION

MTG

.

6.375

-

(

161.93

)

PANEL

LOCATIONS

PANEL

DRILLING

OR

CUTOUT

FOR

TERMINAL

AND

MTG

.

DETHILS

PROJECTION

MTG

.

(

FRONT

VIEW

)

FOR

PROJECTION

MTG

.

PANEL

2.688

•

(

68.28

)

.

563

DIR

.

(

14.29

)

2

HOLES

CRSE

SPACERS

FOR

THIN

PANELS

^

5

/

16

-

18

SCREW

(

FOR

THICK

PANELS

[

r

USE

5

/

16

-

18

STUDS

)

>

INTERNAL

-

EXTERNAL

_

TOOTH

WASHERS

T

1.344

(

34.14

)

-

5.375

•

(

136.53

)

.

0

lB

<

.

397

>

,

-

«

NOTE

PROJECTION

HARDWARE

MUST

BE

ORDERED

SEPARATELY

.

H

^

r

.

250

(

6.350

)

.

190

-

32

SCREW

1.031

“

(

26.19

)

1.344

(

34.14

)

.

375

R

(

9.53

)

FOR

THICK

PANELS

USE

.

190

-

32

STUDS

TYP

.

n

i

1

.

594

1.0

(

15.09

)

(

25.4

)

z

T

*

3

9

S

7

1

T

1.813

(

46.05

)

2.0

I

.

64

!

DIA

.

(

16.20

)

PANCL

(

50.8

)

1

6

e

10

2

I

r

"

DIMENSIONS

IN

INCHES

(

DIMENSIONS

IN

MILLIMETERS

)

TERMINAL

NUMBER

4

*

.

516

(

13.11

)

.

750

DIA

.

(

19.05

)

10

HOLES

OR

1

CUTOUT

*

Sub

16

57

D

7901

ls

>

-

1.031

(

26.19

)

TYP

.

Ol

to

X

<

0

Figure

8

.

Outline

and

Drilling

Plan

for

the

Type

CRN

-

1

Relay

in

the

Type

FT

-

21

Case

.

Courtesy of NationalSwitchgear.com

ABB CRN-1 Manual

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