ABB CWC Manuale

AIM

AN

ABB

Power

T

&

D

Company

Inc

.

Relay

Division

Coral

Springs

,

FL

33065

Instruction

Leaflet

I

.

L

.

41

-

242.4

F

Type

CWC

and

CWP

Directional

Ground

Relays

Effective

October

1975

Supersedes

I

.

L

.

41

-

242.4

E

dated

October

1973

^

Denotes

change

since

Before

putting

relays

into

service

,

re

-

shown

in

Fig

.

2

and

4

.

The

upper

pole

of

both

the

CWC

and

CWP

relays

are

tapped

.

In

addition

,

the

lower

pole

is

tapped

on

the

type

CWC

relay

.

CAUTION

move

all

blocking

which

may

have

been

inserted

for

the

purpose

of

securing

the

parts

during

shipment

,

make

sure

that

all

moving

parts

operate

freely

,

in

-

spect

the

contacts

to

see

that

they

are

clean

and

close

properly

,

and

operate

the

relay

to

check

the

settings

and

electrical

connections

.

The

electromagnets

are

connected

to

the

pro

-

tected

apparatus

in

a

manner

so

that

out

-

of

-

phase

fluxes

are

produced

by

the

flow

of

currents

in

both

the

upper

and

lower

pole

circuits

.

The

out

-

of

-

phase

fluxes

cause

either

a

contact

opening

or

a

contact

closing

torque

depending

upon

the

relative

direction

of

current

flow

in

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

on

grounded

neutral

power

systems

.

The

type

CWC

relay

is

polarized

by

current

from

a

suitably

grounded

power

transformer

bank

neutral

.

Therefore

,

*

its

application

does

not

require

voltage

transformers

.

The

type

CWP

relay

is

voltage

polarized

by

residual

voltage

obtained

across

the

open

corner

of

the

delta

winding

of

a

grounded

wye

-

delta

voltage

transformer

.

PHASE

SHIFTER

NETWORK

The

phase

shifter

network

of

the

type

CWP

relay

consists

of

a

capacitor

and

resistor

connected

in

series

with

the

lower

pole

circuit

.

INDICATING

CONTACTOR

SWITCH

UNIT

(

ICS

)

At

stations

where

the

power

transformer

bank

netural

is

grounded

,

the

residual

voltage

will

be

small

generally

,

and

the

type

CWC

relay

is

recom

-

mended

.

At

ungrounded

stations

,

or

at

ground

stations

where

the

power

transformer

bank

neutral

is

not

avail

-

able

,

the

type

CWP

relay

is

applicable

.

The

d

-

c

indicating

contactor

switch

is

a

small

clapper

type

device

.

A

magnetic

armature

,

to

which

leaf

-

spring

mounted

contacts

are

attached

,

is

attacted

to

the

magnetic

core

upon

energization

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

armature

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

.

CONSTRUCTION

The

type

CWC

and

CWP

relays

consists

of

an

operating

unit

,

an

indicating

contactor

switch

,

and

optional

indicating

instantaneous

trip

unit

,

addition

to

the

above

components

,

the

type

CWP

relay

has

a

phase

shifter

network

.

The

principal

compo

-

nent

parts

of

the

relay

and

their

locations

are

shown

in

Fig

.

1

-

8

.

In

The

front

spring

,

in

addition

to

holding

the

target

,

provides

restraint

for

the

armature

and

thus

controls

the

pickup

value

of

the

switch

.

INDICATING

INSTANTANEOUS

TRIP

UNIT

(

HT

)

OPERATING

UNIT

The

instantaneous

trip

unit

is

a

small

a

-

c

operat

-

ed

clapper

type

device

.

A

magnetic

armature

,

to

which

leaf

-

spring

mounted

contacts

are

attached

,

Is

This

unit

is

an

induction

disc

unit

with

an

elec

-

tromagnet

that

has

poles

above

and

below

the

disc

as

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

ABB

Power

T

&

D

Company

Inc

.

representative

should

be

contacted

.

Printed

in

USA

.

Courtesy of NationalSwitchgear.com

TYPE

CWC

AND

CWP

RELAYS

Fig

.

1

.

Type

CWC

Relay

(

front

view

)

ft

*

,

.

x

,

...

'

..

"

v

,

...

in

I

n

-

m

Fig

.

2

.

Type

CWC

Relay

(

rear

view

}

2

Courtesy of NationalSwitchgear.com

TYPE CWC AND CWP RELAYS

I.L.

41-242.4F

Fig. 3. Type CWP

Relay

(front

view)

Fig

4

Type

CWP

Relay

(rear

view)

3

Courtesy of NationalSwitchgear.com

TYPE

CWC

AND

CWP

RELAYS

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COHTACTO

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PROMT

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IHSTAHTAREOVS

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CONTACTS

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.

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-

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57

-

D

-

7921

Fig

.

5

.

internal

Schematic

of

Double

Trip

Type

CWC

Re

-

lay

in

the

Type

FT

-

21

Case

.

For

the

Single

Trip

Relay

the

Circuits

Associated

with

Terminal

2

ore

omitted

.

Fig

.

6

.

Internal

Schematic

of

the

Type

CWC

Relay

with

Indieating

Instantaneous

Trip

Unit

in

the

Type

FT

-

21

Case

.

product

which

is

the

minimum

pickup

product

of

two

equal

or

unequal

currents

.

Type

CWC

Relay

Ranges

and

taps

are

:

attracted

to

the

magnetic

core

upon

energization

of

the

switch

.

When

the

switch

closes

,

the

moving

con

-

tacts

bridge

two

stationary

contacts

completing

the

trip

circuit

.

Also

during

the

operation

two

fingers

on

the

armature

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

.

25

to

4

Product

Range

Product

.

25

.

36

.

64

1.0

1.44

2.56

4.0

2.25

to

36

Product

Range

Product

2.25

4.0

6.25

9.0

16.0

25.0

36.0

A

core

screw

accessible

from

the

top

of

the

switch

provides

the

adjustable

pickup

range

.

The

minimum

and

maximum

pickup

points

are

indicated

on

the

scale

,

which

is

located

to

the

rear

of

the

core

screw

.

The

first

four

values

are

marked

on

the

lower

pole

tap

plate

.

The

upper

pole

tap

plate

is

marked

x

1

and

x

4

Product

.

The

last

four

values

are

obtained

by

using

the

x

4

tap

with

the

four

lower

pole

taps

.

OPERATION

AND

CHARACTERISTICS

Typical

60

Hertz

time

-

product

curves

for

the

type

CWC

relay

are

shown

in

Fig

.

9

.

These

curves

are

taken

at

maximum

torque

which

occurs

with

the

currents

in

phase

.

For

residual

and

Ground

currents

out

of

phase

the

relay

operating

time

may

be

obtained

by

determining

the

operating

time

corresponding

to

the

product

P

*

=

P

Cos

6

,

where

P

is

the

actual

relay

product

in

amperes

squared

,

and

9

is

the

angle

between

the

residual

and

polarizing

currents

.

*

The

operating

torque

for

the

CWC

relay

is

obtain

-

ed

by

energizing

the

lower

pole

coil

with

residual

current

(

usually

obtained

from

the

line

current

trans

-

former

)

and

the

2

tapped

upper

pole

coils

with

resid

-

ual

current

from

the

current

transformer

in

the

power

bank

neutral

.

For

the

CWP

relay

the

operating

torque

is

obtained

by

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

±

7

%

are

shown

in

Fig

.

10

.

TYPE

CWC

RELAY

TYPE

CWP

RELAY

The

type

CWC

relay

has

two

taps

on

the

upper

pole

and

four

on

the

lower

pole

.

They

are

marked

in

The

type

CWP

relay

taps

are

on

the

upper

pole

4

Courtesy of NationalSwitchgear.com

TYPE

CWC

AND

CWP

RELAYS

I

.

L

.

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-

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TEST

SH

1

TCA

MttCBT

TEST

JACK

TEMIBAL

-

W

-

1

i

_

.

©

0

•

*

FRONT

VI

1

»

FRONT

VIEW

WITH

aCLATIVE

laSTASTAIEMS

POLAIITT

AS

SHOW

THE

NAia

COHTACTS

CLOSE

WITH

AELATI

1

E

lUTAHTAIEOUS

POUIITT

AS

SHOW

.

THE

HAlH

COHTACTS

CLOSE

183

AT

13

183

A

712

Fig

.

7

.

Internal

Schematic

of

the

Type

CWP

Relay

in

the

Type

FT

-

21

Case

.

For

the

Single

Trip

Relay

the

Circuits

Associated

with

Terminal

2

are

omitted

.

Fig

.

8

.

Internal

Schematic

of

the

Type

CWP

Relay

with

Indicating

/

nsfonfoneous

Trip

Unit

in

the

Type

FT

21

Case

.

safely

close

30

amperes

at

250

volts

d

-

c

,

and

will

carry

this

current

long

enough

to

trip

a

breaker

*

They

represent

the

minimum

pickup

product

of

current

times

voltage

at

maximum

torque

when

the

current

lags

the

voltage

by

60

°

.

The

range

and

taps

are

:

current

coil

.

The

indicating

contactor

switch

has

two

taps

that

provide

a

pickup

setting

of

0.2

or

2

amperes

,

change

taps

requires

connecting

the

lead

located

in

front

of

the

tap

block

to

the

desired

setting

by

means

of

a

screw

connection

.

To

Product

Range

Tap

Markings

20

-

150

20

30

40

50

75

100 150

75

-

600

75

100 150

200

300

400

600

TRIP

CIRCUIT

CONSTANT

Indicating

Contactor

Switch

(

ICS

)

*

Typical

60

Hertz

time

product

curves

for

the

type

CWP

relay

are

shown

in

Fig

.

11

.

These

curves

are

taken

at

maximum

torque

which

occurs

with

the

current

lagging

the

voltage

60

°

.

For

currents

not

lagging

by

this

angle

,

the

relay

tripping

time

may

be

obtained

by

determining

the

operating

time

correspond

-

ing

to

the

product

p

'

-

P

Cos

(

60

°

-

6

)

,

where

P

is

the

actual

relay

V

.

A

.

product

and

6

is

the

angle

the

current

lags

the

voltage

.

The

curves

are

accurate

within

±

17

c

if

the

multiple

of

tap

product

does

not

exceed

the

voltage

on

the

relay

coil

.

0.2

ampere

tap

6.5

ohms

d

-

c

resistance

2.0

ampere

tap

0.15

ohms

d

-

c

resistance

SETTING

CWC

INDUCTION

UNIT

Select

the

desired

upper

and

lower

pole

taps

.

Set

the

time

dial

by

applying

a

preselected

current

to

the

relay

coils

,

and

adjusting

the

dial

position

to

obtain

the

desired

time

of

operation

.

Alternatively

the

dial

may

be

set

by

inspection

,

if

the

timing

coordination

is

not

critical

.

TRIP

CIRCUIT

The

main

contacts

will

safely

close

30

amperes

at

250

volts

d

-

c

and

the

seal

-

in

contacts

of

the

in

-

dicating

contactor

switch

will

safely

carry

this

cur

-

rent

long

enough

to

trip

a

circuit

breaker

.

CWP

INDUCTION

UNIT

Select

the

desired

upper

pole

tap

.

position

by

applying

a

preselected

voltage

and

current

(

current

lagging

voltage

by

60

°

-

see

Fig

.

16

to

the

Set

the

dial

The

indicating

instantaneous

trip

contacts

will

5

Courtesy of NationalSwitchgear.com

TYPE

CWC

AND

CWP

RELAYS

?

0

10

0

S

5

4

3

2

I

.

8

•

n

o

.

5

x

o

.

4

o

ui

T

|

MC

DIAL

SETTIRC

in

.

3

z

ui

.

2

a

11

4

-

r

:

7

.

1

I

5

.

a

i

4

3

9

*

.

05

2

.

04

.

03

I

02

l

/

t

51

629

A

272

MULTIPLES

OF

TAP

PRODUCT

Fig

.

9

.

Typical

Time

Curves

of

the

Type

CWC

Relay

-

Current

Coils

in

Series

-

See

Fig

.

10

for

application

limits

.

The

nameplate

data

will

furnish

the

actual

cur

-

rent

range

that

‘

may

be

obtained

from

the

ITT

unit

.

relay

coils

and

adjusting

the

dial

position

to

obtain

-

ed

the

desired

time

of

operation

.

Alternatively

the

dial

may

be

set

by

inspection

,

if

the

timing

coordina

-

tion

is

not

critical

.

SETTING

CALCULATIONS

The

following

information

is

required

to

set

these

Indicating

Contactor

Switch

(

ICS

)

relays

:

No

setting

is

required

on

the

ICS

unit

except

the

selection

of

the

0.2

or

2.0

ampere

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

d

-

c

type

WL

relay

switch

,

or

equiva

-

lent

,

use

the

0.2

ampere

tap

;

for

48

volt

d

-

c

applica

-

tions

set

relay

in

2

tap

and

use

S

#

304

C

209

G

01

Type

WL

Relay

or

equivalent

.

INDICATING

INSTANTANEOUS

TRIP

(

IIT

)

1

.

The

maximum

and

minimum

ground

fault

current

for

faults

at

the

relay

and

at

the

remote

bus

.

These

values

should

be

residual

current

which

is

three

times

the

zero

sequence

current

.

2

.

The

maximum

and

minimum

polarizing

current

or

voltage

values

for

the

faults

above

.

The

values

should

be

residual

currents

or

voltage

which

are

three

times

the

zero

sequence

values

.

3

.

The

current

transformer

ratios

of

the

main

and

polarizing

current

transformers

for

the

type

CWC

relay

applications

or

the

main

current

transformer

ratio

and

the

polarizing

potential

transformer

ratio

for

the

type

CWP

relay

application

.

Since

the

minimum

and

maximum

markings

on

the

scale

only

indicate

the

working

range

of

the

core

screw

,

the

core

screw

must

be

adjusted

to

the

value

of

the

pickup

current

desired

.

6

Courtesy of NationalSwitchgear.com

I

.

L

.

41

-

242.4

F

TYPE

CWC

AND

CWP

RELAYS

For

the

2.25

to

36

Product

Range

For

the

0.25

to

4

Product

Range

I

^

LL

R

=

M

%

where

IL

=

the

lower

pole

current

.

IJJ

=

thfe

upper

pole

current

.

N

=

value

from

the

table

below

for

various

tap

combinations

.

where

IL

=

the

lower

pole

current

.

IJJ

=

the

upper

pole

current

.

M

=

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

N

K

M

Product

4.0

30

2.25

40

1.44

50

1.0

60

16.0

60

9.0

80

5.76

100

4.0

120

4.0

10

2.78

12

1.56

16

1.0

20

16.0

20

11.1

24

6.25

32

4.0

40

2.25

1

2.25

.

25

.

25

1

4.0

1

.

36

.

36

1

6.25

1

6.25

.

64

.

64

1

9.0

1

9.0

1.0

1

9.0

2.25

4

.

25

1.0

4

16.0

4.0

4

.

36

4

1.44

25.0

6.25

4

.

64

2.56

36.0

4

9.0

1.00

4

The

Typical

time

curves

for

the

Type

CWC

Relay

apply

if

the

values

of

R

falls

within

the

shaded

area

of

the

curve

above

,

and

if

neither

relay

current

is

greater

than

K

in

amperes

.

Ftg

.

10

.

Limits

for

Application

of

the

CWC

Time

Curves

.

7

Courtesy of NationalSwitchgear.com

TYPE

CWC

AND

CWP

RELAYS

20

10

6

S

4

3

2

I

<

/

>

o

8

u

UJ

CO

.

6

TIME

DIAL

SETTING

5

.

5

.

4

-

.

3

li

r

:

.

2

7

6

5

4

.

1

3

.

0

«

2

.

06

.

0

5

l

.

04

.

03

72

.

02

.

01

3

4

5

6 6

10

MULTIPLES

OF

TAP

PRODUCT

20

30

40

50

60

80

100

ISO

NOTE

:

CURVES

ARE

VALID

IF

THE

MULTIPLE

OF

THE

TAP

PRODUCT

(

VOLTS

-

AMPERES

)

DOES

NOT

EXCEED

THE

VOLTAGE

ON

THE

RELAY

POLARIZING

COILS

.

(

MADE

FROM

CURVE

538020

)

Curve

629

A

273

These

Curves

are

valid

if

the

multiple

of

tap

Product

(

volt

-

amperes

)

does

not

exceed

the

voltage

on

the

relay

polarizing

coils

.

Fig

.

11

.

Typical

Time

Curves

of

the

Type

CWP

Relay

at

Maximum

Torque

Angle

-

Curves

Apply

if

the

Multiple

of

Tap

Product

in

Volt

-

Amperes

Does

Not

Exceed

the

Polarizing

Voltage

in

Volts

.

8

Courtesy of NationalSwitchgear.com

I

.

L

.

41

-

242.4

F

TYPE

CWC

AND

CWP

RELAYS

STATION

A

STATION

C

STATION

B

(

3

)

CO

(

3

)

AA

—

°

-

ok

M

*

<

5

c

/

V

£

2

-

/

320

620

/

-

3

+

50

2

-

/

320

3

-

CUP

3

E

o

£

-

/

OO

3

-

36

,

fOO

^

!

/

-

£

9

/

0

2

-

/

0

+

0

Fig

.

12

.

Typical

System

for

Setting

Type

CWC

and

CWP

Relays

.

the

remote

line

or

bus

relay

operating

time

.

This

.

4

to

.

75

second

interval

is

known

as

the

coordinating

time

interval

.

It

includes

the

circuit

breaker

operat

-

ing

time

plus

a

factor

allowing

for

difference

between

actual

fault

currents

and

calculated

values

,

dif

-

ferences

in

individual

relay

performance

,

etc

.

For

8

cycle

breakers

the

value

of

.

4

second

is

commonly

used

,

while

for

30

cycle

breakers

,

.

75

second

is

used

.

Each

relay

should

be

set

to

operate

as

rapidly

as

possible

for

ground

faults

on

the

transmission

lines

near

the

breaker

.

The

product

available

for

the

relay

in

these

cases

should

be

large

enough

to

re

-

present

a

large

multiple

of

the

tap

product

value

so

the

operating

times

can

be

in

range

of

0.05

to

0.20

second

as

seen

from

the

curves

of

Figs

.

9

and

11

.

However

,

the

relays

cannot

distinguish

between

a

fault

on

the

line

near

the

remote

breaker

for

which

they

should

operate

,

and

a

similar

fault

on

the

bus

or

adjacent

line

for

which

they

should

not

operate

until

the

bus

differential

or

adjacent

line

relays

have

had

an

opportunity

to

operate

and

clear

the

fault

.

This

re

-

quires

an

increased

time

setting

of

the

relay

for

faults

near

the

remote

terminal

.

The

product

available

for

the

relay

in

these

cases

will

be

smaller

than

that

for

the

close

faults

and

should

represent

a

smaller

mul

-

tiple

of

the

tap

product

previously

chosen

so

the

op

-

erating

time

can

be

from

.

4

to

.

75

second

longer

than

As

an

example

,

a

type

CWC

relay

is

to

be

con

-

nected

at

Station

A

and

set

to

protect

the

line

running

to

Station

B

.

It

must

select

or

coordinate

with

the

type

CWP

relay

connected

at

Station

B

and

set

to

protect

the

line

running

to

Station

C

.

The

fault

cur

-

rent

and

voltage

for

single

line

-

to

-

ground

faults

under

minimum

conditions

for

this

system

are

shown

in

Fig

.

12

.

In

setting

the

type

CWC

and

CWP

relays

,

it

is

convenient

to

set

up

Table

as

shown

.

9

Courtesy of NationalSwitchgear.com

TYPE

CWC

AND

CWP

RELAYS

STATION

BuS

STATION

ouj

A

B

•

B

P

C

o

2

32

M

32

*

m

7

-

=

*

c

—

u

321

5

A

~

*

~

0

^

L

6

C

»

&

£

1

P

0

L

ae

»

p

a

oe

'

J

PHASE

RELAYS

}

-

PHASE

1

DELAYS

CONTACTS

CLOSE

i

22

3

V

0

~

-

VP

-

3

VQ

60

*

(

REF

)

I

POL

32

N

f

32

«

32

«

ill

:

501

»

+

T

'

r

^

t

9

-

lOP

8

I

CONTACT

CLOSES

PHASORS

SHOWN

FOR

MAX

.

CONTACT

CLOSE

TORQUE

.

«

0

”

0

52

5

i

SHOWN

FOR

MAX

.

CONTACT

CLOSE

TORQUE

TIT

ABC

UtN

Sl

'

P

»

.

IW

WHEN

SUPPLIES

A

B

C

'

ICt

NUMBER

CHARf

i

/

b

TRIP

BUS

DEVICE

NUMBER

CHART

DC

TRIP

BUS

70

S

.

POS

.

37

N

-

JJNAL

uKOUHO

RELAY

,

TYPE

CWC

32

N

*

DIRECTIONAL

8

R

0

UND

RELAY

,

TYPE

CWP

3

?

N

32

H

.

10

Y

~

-

LOWtU

POLt

WINUINC

OF

TYPE

CwC

32

N

10

32

N

—

-

LOWER

POU

WINDING

OF

TYPE

CWP

32

H

~

u

“

‘

yf

>

PtR

P

0

Lt

HI

HU

I

NOS

OF

TYPE

owe

IHUiLArIHG

IhSiANfAREUUS

TRIP

UNIT

52

-

PO

^

EA

CIRCUIT

SKEAKtK

INDICA

.

iNO

CuNfACfOR

SWITCH

J

-

e

:

.

t

«

AUK

AUXILIAKI

CONTACT

TC

-

Bi

<

EAKEK

TRIP

COIL

i

ics

;

32

N

ICS

SON

—

-

UPPER

POLE

WINDING

OF

TYPE

CWP

i

.

i

.

32

«

COLICS

J

2

»

_

^

:

IC

$

SON

:

|

:

50

B

SOB

-

INDICATING

INSTANTANEOUS

TRIP

UNIT

52

-

POWER

CIRCUIT

BREAKER

ICS

-

INDICATING

CONTACTOR

SWITCH

a

-

BREAKER

AUXILIARY

CONTACT

TC

-

BREAKER

TRIP

COIL

f

Ivi

32

N

^

'

32

M

A

32

1

J

i

J

*

—

s

?

a

sea

52

Tt

TC

NEC

.

NEB

.

1

$

+

A

137

182

A

804

*

3

C

Fig

.

14

.

External

Schematic

of

the

Type

CWP

Relay

for

Ground

Protection

.

*

Fig

.

73

.

External

Schematic

of

the

Type

CWC

Relay

for

Ground

Protection

.

TABLE

1

*

2

1

3

4

5

6

7

8

9

10

11

1 2

13

14

15

Line

Relay

Fault

Primary

C

-

T

,

Location

No

.

Amps

.

Ratio

Polarizing

Primary

Amps

.

C

.

T

.

orP

.

T

.

or

Volts

Line

Polarizing

Secondary

Product

I

-

Amps

.

(

ITJ

)

lv

x

IL

I

(

J

Multiples

Tap

of

Tap

Product

R

Time

In

Dial

Seconds

Ratio

Amps

.

(

I

^

)

D

1

3450

300

/

5

2910

300

/

5

57.5

48.5

2780

1.19

36

77

4.76

2

.

11

D

2

1320

1040

22.0

17.3

381

1.27

10.6

5.1

.

52

F

1320

100

/

5

83

,

100

V

2

1000

/

1

66.0

83.1

V

5485

300

18

-

3

/

-

.

13

F

3

620

36

,

500

V

31.0

36.5

V

1130

3.8

.

53

The

relay

location

is

shown

in

Column

1

and

the

fault

location

in

Column

2

.

The

primary

line

residual

current

available

for

the

relay

is

recorded

in

Column

3

.

The

ratio

of

these

current

transformers

is

spec

-

ified

in

Column

4

.

Column

4

.

The

value

is

recorded

in

Column

7

.

The

upper

pole

relay

current

is

the

value

of

Column

5

divided

by

the

ratio

of

Column

6

,

and

is

recorded

in

Column

8

.

The

relay

operating

product

is

the

values

of

Column

7

and

8

multiplied

together

and

recorded

in

Column

9

.

For

the

type

CWC

relays

,

the

ratio

of

IL

/

IU

written

in

Column

10

.

All

of

this

data

is

fixed

by

and

is

*

.

*

•

/

ninary

to

making

the

actual

relay

setting

.

The

primary

fault

current

or

voltage

available

for

the

polarizing

winding

is

shown

in

Column

5

,

and

the

associated

current

or

potential

transformer

ratio

in

Column

6

.

All

of

these

fault

values

are

residual

values

or

three

times

the

zero

sequence

current

of

voltage

.

The

relay

current

for

the

lower

pole

wind

-

ings

is

the

value

of

Column

3

divided

by

the

ratio

of

system

constants

and

characteristics

.

The

choice

of

a

tap

recorded

in

Column

11

and

of

the

time

lever

in

Column

14

is

a

matter

of

trial

and

10

Courtesy of NationalSwitchgear.com

ABB CWC Manuale

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