ABB CWC Manuel

AIM

ABB

Power

Company

Inc

Relay

Division

Coral

Springs

33065

Instruction

Leaflet

242.4

Type

CWC

and

CWP

Directional

Ground

Relays

Effective

October

1975

Supersedes

242.4

dated

October

1973

Denotes

change

since

issue

Before

putting

relays

into

service

shown

Fig

and

The

upper

pole

both

the

CWC

and

CWP

relays

are

tapped

addition

the

lower

pole

tapped

the

type

CWC

relay

CAUTION

move

all

blocking

which

may

have

been

inserted

for

the

purpose

securing

the

parts

during

shipment

make

sure

that

all

moving

parts

operate

freely

spect

the

contacts

see

that

they

are

clean

and

properly

and

operate

the

relay

check

the

settings

and

electrical

connections

The

electromagnets

are

connected

the

pro

tected

apparatus

manner

that

out

phase

fluxes

are

produced

the

flow

currents

both

the

upper

and

lower

pole

circuits

The

out

phase

fluxes

cause

either

contact

opening

contact

closing

torque

depending

upon

the

relative

direction

current

flow

the

upper

and

lower

pole

circuits

APPLICATION

The

type

CWC

and

CWP

relays

are

induction

disc

type

relays

used

for

directional

ground

fault

protec

tion

grounded

neutral

power

systems

The

type

CWC

relay

polarized

current

from

suitably

grounded

power

transformer

bank

neutral

Therefore

its

application

does

not

require

voltage

transformers

The

type

CWP

relay

voltage

polarized

residual

voltage

obtained

across

the

open

corner

the

delta

winding

grounded

wye

delta

voltage

transformer

PHASE

SHIFTER

NETWORK

The

phase

shifter

network

the

type

CWP

relay

consists

capacitor

and

resistor

connected

series

with

the

lower

pole

circuit

INDICATING

CONTACTOR

SWITCH

UNIT

(

ICS

)

stations

where

the

power

transformer

bank

netural

grounded

the

residual

voltage

will

small

generally

and

the

type

CWC

relay

recom

mended

ungrounded

stations

ground

stations

where

the

power

transformer

bank

neutral

not

avail

able

the

type

CWP

relay

applicable

The

indicating

contactor

switch

small

clapper

type

device

magnetic

armature

which

leaf

spring

mounted

contacts

are

attached

attacted

the

magnetic

core

upon

energization

the

switch

When

the

switch

closes

the

moving

contacts

bridge

two

stationary

contacts

completing

the

trip

circuit

Also

during

this

operation

two

fingers

the

armature

deflect

spring

located

the

front

the

switch

which

allows

the

operation

indicator

target

drop

The

target

reset

from

the

outside

the

case

push

rod

located

the

bottom

the

cover

CONSTRUCTION

The

type

CWC

and

CWP

relays

consists

operating

unit

indicating

contactor

switch

and

optional

indicating

instantaneous

trip

unit

addition

the

above

components

the

type

CWP

relay

has

phase

shifter

network

The

principal

compo

nent

parts

the

relay

and

their

locations

are

shown

Fig

The

front

spring

addition

holding

the

target

provides

restraint

for

the

armature

and

thus

controls

the

pickup

value

the

switch

INDICATING

INSTANTANEOUS

TRIP

UNIT

(

)

OPERATING

UNIT

The

instantaneous

trip

unit

small

operat

clapper

type

device

magnetic

armature

which

leaf

spring

mounted

contacts

are

attached

This

unit

induction

disc

unit

with

elec

tromagnet

that

has

poles

above

and

below

the

disc

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

Printed

USA

Courtesy of NationalSwitchgear.com

TYPE

CWC

AND

CWP

RELAYS

Fig

Type

CWC

Relay

(

front

view

)

...

Fig

Type

CWC

Relay

(

rear

view

}

Courtesy of NationalSwitchgear.com

TYPE CWC AND CWP RELAYS

I.L.

41-242.4F

Fig. 3. Type CWP

Relay

(front

view)

Fig

Type

CWP

Relay

(rear

view)

Courtesy of NationalSwitchgear.com

TYPE

CWC

AND

CWP

RELAYS

IROtCATIHC

COHTACTO

svircii

IHPtCATIRft

COHTACTO

WITCH

HOLES

ivrn

POLES

LOVCt

POLE

LOVE

POLE

ilT

IHMCTIOH

WIT

liOUCTiO

urn

lUsK

ICS

iiir

IHRICATIM

IISTAHTAMMS

INI

CHC

CHASSIS

OPEIATEP

SNorriM

WITOI

—

CMAUlS

OPEJUTD

SMOATlM

WITCH

•

HAMLE

TEST

WITCH

OIMOTT

TffT

JAM

’

IEO

WHOLE

—

yiH

)

®©

TEST

SHITCH

CMROT

TEST

JACK

TEHI

TEMINAL

PROMT

VIIV

FRONT

VICV

fITU

taATlilE

IHSTAHTAREOVS

POLARlTT

SHOW

THE

HAIR

CUTACTS

tim

IELAHVE

IHSTAHTAHCOVS

routin

SHOW

THE

MAIH

CONTACTS

aOSE

7920

7921

Fig

internal

Schematic

Double

Trip

Type

CWC

lay

the

Type

Case

For

the

Single

Trip

Relay

the

Circuits

Associated

with

Terminal

ore

omitted

Fig

Internal

Schematic

the

Type

CWC

Relay

with

Indieating

Instantaneous

Trip

Unit

the

Type

Case

product

which

the

minimum

pickup

product

two

equal

unequal

currents

Type

CWC

Relay

Ranges

and

taps

are

attracted

the

magnetic

core

upon

energization

the

switch

When

the

switch

closes

the

moving

con

tacts

bridge

two

stationary

contacts

completing

the

trip

circuit

Also

during

the

operation

two

fingers

the

armature

deflect

spring

located

the

front

the

switch

which

allows

the

operation

indicator

target

drop

The

target

reset

from

the

outside

the

case

push

rod

located

the

bottom

the

cover

Product

Range

Product

1.0

1.44

2.56

4.0

2.25

Product

Range

Product

2.25

4.0

6.25

9.0

16.0

25.0

36.0

core

screw

accessible

from

the

top

the

switch

provides

the

adjustable

pickup

range

The

minimum

and

maximum

pickup

points

are

indicated

the

scale

which

located

the

rear

the

core

screw

The

first

four

values

are

marked

the

lower

pole

tap

plate

The

upper

pole

tap

plate

marked

and

Product

The

last

four

values

are

obtained

using

the

tap

with

the

four

lower

pole

taps

OPERATION

AND

CHARACTERISTICS

Typical

Hertz

time

product

curves

for

the

type

CWC

relay

are

shown

Fig

These

curves

are

taken

maximum

torque

which

occurs

with

the

currents

phase

For

residual

and

Ground

currents

out

phase

the

relay

operating

time

may

obtained

determining

the

operating

time

corresponding

the

product

Cos

where

the

actual

relay

product

amperes

squared

and

the

angle

between

the

residual

and

polarizing

currents

The

operating

torque

for

the

CWC

relay

obtain

energizing

the

lower

pole

coil

with

residual

current

(

usually

obtained

from

the

line

current

trans

former

)

and

the

tapped

upper

pole

coils

with

resid

ual

current

from

the

current

transformer

the

power

bank

neutral

For

the

CWP

relay

the

operating

torque

obtained

energizing

the

upper

pole

coils

with

residual

current

(

usually

obtained

from

the

line

cur

rent

transformer

)

and

the

lower

pole

with

residual

voltage

The

limits

for

which

these

curves

are

accurate

within

are

shown

Fig

TYPE

CWC

RELAY

TYPE

CWP

RELAY

The

type

CWC

relay

has

two

taps

the

upper

pole

and

four

the

lower

pole

They

are

marked

The

type

CWP

relay

taps

are

the

upper

pole

Courtesy of NationalSwitchgear.com

TYPE

CWC

AND

CWP

RELAYS

242.4

ivtiuTiae

CNTACTOt

Tea

laciiCiTias

coancroa

MITCH

LMK

IflKt

POLE

ICS

tmt

POLE

UPPCI

POLE

PJJC

iflDuCTioa

uaiT

IBMCTIM

WIT

laoiCiTiai

IIITAITAHEMS

TKIP

CHASSIS

OTEliTIO

CJIM

MITCH

SCO

HAWkE

CHASSIS

MSUtt

sawn

yea

SCO

HAAOLE

(

”

Tea

(

)

(

)

TEST

TCA

MttCBT

TEST

JACK

TEMIBAL

•

FRONT

VIEW

WITH

aCLATIVE

laSTASTAIEMS

POLAIITT

SHOW

THE

NAia

COHTACTS

WITH

AELATI

lUTAHTAIEOUS

POUIITT

SHOW

THE

HAlH

COHTACTS

183

712

Fig

Internal

Schematic

the

Type

CWP

Relay

the

Type

Case

For

the

Single

Trip

Relay

the

Circuits

Associated

with

Terminal

are

omitted

Fig

Internal

Schematic

the

Type

CWP

Relay

with

Indicating

nsfonfoneous

Trip

Unit

the

Type

Case

safely

amperes

250

volts

and

will

carry

this

current

long

enough

trip

breaker

They

represent

the

minimum

pickup

product

current

times

voltage

maximum

torque

when

the

current

lags

the

voltage

The

range

and

taps

are

current

coil

The

indicating

contactor

switch

has

two

taps

that

provide

pickup

setting

0.2

amperes

change

taps

requires

connecting

the

lead

located

front

the

tap

block

the

desired

setting

means

screw

connection

Product

Range

Tap

Markings

150

100 150

600

100 150

200

300

400

600

TRIP

CIRCUIT

CONSTANT

Indicating

Contactor

Switch

(

ICS

)

Typical

Hertz

time

product

curves

for

the

type

CWP

relay

are

shown

Fig

These

curves

are

taken

maximum

torque

which

occurs

with

the

current

lagging

the

voltage

For

currents

not

lagging

this

angle

the

relay

tripping

time

may

obtained

determining

the

operating

time

correspond

ing

the

product

Cos

(

)

where

the

actual

relay

product

and

the

angle

the

current

lags

the

voltage

The

curves

are

accurate

within

the

multiple

tap

product

does

not

exceed

the

voltage

the

relay

coil

0.2

ampere

tap

6.5

ohms

resistance

2.0

ampere

tap

0.15

ohms

resistance

SETTING

CWC

INDUCTION

UNIT

Select

the

desired

upper

and

lower

pole

taps

Set

the

time

dial

applying

preselected

current

the

relay

coils

and

adjusting

the

dial

position

obtain

the

desired

time

operation

Alternatively

the

dial

may

set

inspection

the

timing

coordination

not

critical

TRIP

CIRCUIT

The

main

contacts

will

safely

amperes

250

volts

and

the

seal

contacts

the

dicating

contactor

switch

will

safely

carry

this

cur

rent

long

enough

trip

circuit

breaker

CWP

INDUCTION

UNIT

Select

the

desired

upper

pole

tap

position

applying

preselected

voltage

and

current

(

current

lagging

voltage

see

Fig

the

Set

the

dial

The

indicating

instantaneous

trip

contacts

will

Courtesy of NationalSwitchgear.com

TYPE

CWC

AND

CWP

RELAYS

•

DIAL

SETTIRC

629

272

MULTIPLES

TAP

PRODUCT

Fig

Typical

Time

Curves

the

Type

CWC

Relay

Current

Coils

Series

See

Fig

for

application

limits

The

nameplate

data

will

furnish

the

actual

cur

rent

range

that

‘

may

obtained

from

the

ITT

unit

relay

coils

and

adjusting

the

dial

position

obtain

the

desired

time

operation

Alternatively

the

dial

may

set

inspection

the

timing

coordina

tion

not

critical

SETTING

CALCULATIONS

The

following

information

required

set

these

Indicating

Contactor

Switch

(

ICS

)

relays

setting

required

the

ICS

unit

except

the

selection

the

0.2

2.0

ampere

tap

setting

This

selection

made

connecting

the

lead

located

front

the

tap

block

the

desired

setting

means

the

connecting

screw

When

the

relay

energizes

125

250

volt

type

relay

switch

equiva

lent

use

the

0.2

ampere

tap

;

for

volt

applica

tions

set

relay

tap

and

use

304

209

Type

Relay

equivalent

INDICATING

INSTANTANEOUS

TRIP

(

IIT

)

The

maximum

and

minimum

ground

fault

current

for

faults

the

relay

and

the

remote

bus

These

values

should

residual

current

which

three

times

the

zero

sequence

current

The

maximum

and

minimum

polarizing

current

voltage

values

for

the

faults

above

The

values

should

residual

currents

voltage

which

are

three

times

the

zero

sequence

values

The

current

transformer

ratios

the

main

and

polarizing

current

transformers

for

the

type

CWC

relay

applications

the

main

current

transformer

ratio

and

the

polarizing

potential

transformer

ratio

for

the

type

CWP

relay

application

Since

the

minimum

and

maximum

markings

the

scale

only

indicate

the

working

range

the

core

screw

the

core

screw

must

adjusted

the

value

the

pickup

current

desired

Courtesy of NationalSwitchgear.com

242.4

TYPE

CWC

AND

CWP

RELAYS

For

the

2.25

Product

Range

For

the

0.25

Product

Range

where

the

lower

pole

current

IJJ

thfe

upper

pole

current

value

from

the

table

below

for

various

tap

combinations

where

the

lower

pole

current

IJJ

the

upper

pole

current

value

from

the

table

below

for

various

tap

combinations

Upper

Pole

Product

Tap

Lower

Pole

Product

Tap

Upper

Pole

Product

Tap

Lower

Pole

Product

Tap

Product

4.0

2.25

1.44

1.0

16.0

9.0

5.76

100

4.0

120

4.0

2.78

1.56

1.0

16.0

11.1

6.25

4.0

2.25

4.0

6.25

9.0

1.0

9.0

2.25

1.0

16.0

4.0

1.44

25.0

6.25

2.56

36.0

9.0

1.00

The

Typical

time

curves

for

the

Type

CWC

Relay

apply

the

values

falls

within

the

shaded

area

the

curve

above

and

neither

relay

current

greater

than

amperes

Ftg

Limits

for

Application

the

CWC

Time

Curves

Courtesy of NationalSwitchgear.com

TYPE

CWC

AND

CWP

RELAYS

TIME

DIAL

SETTING

6 6

MULTIPLES

TAP

PRODUCT

100

ISO

NOTE

CURVES

ARE

VALID

THE

MULTIPLE

THE

TAP

PRODUCT

(

VOLTS

AMPERES

)

DOES

NOT

EXCEED

THE

VOLTAGE

THE

RELAY

POLARIZING

COILS

(

MADE

FROM

CURVE

538020

)

Curve

629

273

These

Curves

are

valid

the

multiple

tap

Product

(

volt

amperes

)

does

not

exceed

the

voltage

the

relay

polarizing

coils

Fig

Typical

Time

Curves

the

Type

CWP

Relay

Maximum

Torque

Angle

Curves

Apply

the

Multiple

Tap

Product

Volt

Amperes

Does

Not

Exceed

the

Polarizing

Voltage

Volts

Courtesy of NationalSwitchgear.com

242.4

TYPE

CWC

AND

CWP

RELAYS

STATION

(

)

(

)

—

320

620

320

CUP

fOO

Fig

Typical

System

for

Setting

Type

CWC

and

CWP

Relays

the

remote

line

bus

relay

operating

time

This

second

interval

known

the

coordinating

time

interval

includes

the

circuit

breaker

operat

ing

time

plus

factor

allowing

for

difference

between

actual

fault

currents

and

calculated

values

dif

ferences

individual

relay

performance

etc

For

cycle

breakers

the

value

second

commonly

used

while

for

cycle

breakers

second

used

Each

relay

should

set

operate

rapidly

possible

for

ground

faults

the

transmission

lines

near

the

breaker

The

product

available

for

the

relay

these

cases

should

large

enough

present

large

multiple

the

tap

product

value

the

operating

times

can

range

0.05

0.20

second

seen

from

the

curves

Figs

and

However

the

relays

cannot

distinguish

between

fault

the

line

near

the

remote

breaker

for

which

they

should

operate

and

similar

fault

the

bus

adjacent

line

for

which

they

should

not

operate

until

the

bus

differential

adjacent

line

relays

have

had

opportunity

operate

and

clear

the

fault

This

quires

increased

time

setting

the

relay

for

faults

near

the

remote

terminal

The

product

available

for

the

relay

these

cases

will

smaller

than

that

for

the

faults

and

should

represent

smaller

mul

tiple

the

tap

product

previously

chosen

the

erating

time

can

from

second

longer

than

example

type

CWC

relay

con

nected

Station

and

set

protect

the

line

running

Station

must

select

coordinate

with

the

type

CWP

relay

connected

Station

and

set

protect

the

line

running

Station

The

fault

cur

rent

and

voltage

for

single

line

ground

faults

under

minimum

conditions

for

this

system

are

shown

Fig

setting

the

type

CWC

and

CWP

relays

convenient

set

Table

shown

Courtesy of NationalSwitchgear.com

TYPE

CWC

AND

CWP

RELAYS

STATION

BuS

STATION

ouj

•

—

321

PHASE

RELAYS

}

PHASE

DELAYS

CONTACTS

(

REF

)

POL

ill

501

lOP

CONTACT

CLOSES

PHASORS

SHOWN

FOR

MAX

CONTACT

TORQUE

”

SHOWN

FOR

MAX

CONTACT

TORQUE

TIT

ABC

UtN

WHEN

SUPPLIES

ICt

NUMBER

CHARf

TRIP

BUS

DEVICE

NUMBER

CHART

TRIP

BUS

POS

JJNAL

uKOUHO

RELAY

TYPE

CWC

DIRECTIONAL

UND

RELAY

TYPE

CWP

LOWtU

POLt

WINUINC

TYPE

CwC

—

LOWER

POU

WINDING

TYPE

CWP

“

‘

PtR

NOS

TYPE

owe

IHUiLArIHG

IhSiANfAREUUS

TRIP

UNIT

CIRCUIT

SKEAKtK

INDICA

iNO

CuNfACfOR

SWITCH

AUK

AUXILIAKI

CONTACT

EAKEK

TRIP

COIL

ics

;

ICS

SON

—

UPPER

POLE

WINDING

TYPE

CWP

COLICS

SON

SOB

INDICATING

INSTANTANEOUS

TRIP

UNIT

POWER

CIRCUIT

BREAKER

ICS

INDICATING

CONTACTOR

SWITCH

BREAKER

AUXILIARY

CONTACT

BREAKER

TRIP

COIL

Ivi

—

sea

NEC

NEB

137

182

804

Fig

External

Schematic

the

Type

CWP

Relay

for

Ground

Protection

Fig

External

Schematic

the

Type

CWC

Relay

for

Ground

Protection

TABLE

1 2

Line

Relay

Fault

Primary

Location

Amps

Ratio

Polarizing

Primary

Amps

orP

Volts

Line

Polarizing

Secondary

Product

Amps

(

ITJ

)

(

Multiples

Tap

Product

Time

Dial

Seconds

Ratio

Amps

(

)

3450

300

2910

300

57.5

48.5

2780

1.19

4.76

1320

1040

22.0

17.3

381

1.27

10.6

5.1

1320

100

1000

66.0

83.1

5485

300

620

500

31.0

36.5

1130

3.8

The

relay

location

shown

Column

and

the

fault

location

Column

The

primary

line

residual

current

available

for

the

relay

recorded

Column

The

ratio

these

current

transformers

spec

ified

Column

The

value

recorded

Column

The

upper

pole

relay

current

the

value

Column

divided

the

ratio

Column

and

recorded

Column

The

relay

operating

product

the

values

Column

and

multiplied

together

and

recorded

Column

For

the

type

CWC

relays

the

ratio

written

Column

All

this

data

fixed

and

•

ninary

making

the

actual

relay

setting

The

primary

fault

current

voltage

available

for

the

polarizing

winding

shown

Column

and

the

associated

current

potential

transformer

ratio

Column

All

these

fault

values

are

residual

values

three

times

the

zero

sequence

current

voltage

The

relay

current

for

the

lower

pole

wind

ings

the

value

Column

divided

the

ratio

system

constants

and

characteristics

The

choice

tap

recorded

Column

and

the

time

lever

Column

matter

trial

and

Courtesy of NationalSwitchgear.com

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