GE JBCV51M Manuale utente

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(1)

C.)

-I

DESCRIPTION

APPLICATION

RATINGS

TIME

OVERCURRENT

UNIT

INSTANTANEOUS

OVERCURRENT

UNIT

(DIRECTIONALLY

CONTROLLED)

DIRECTIONAL

UNIT

INSTANTANEOUS

UNT

(NON-DIRECTIONALLY

CONTROLLED)

TARGET

AND

SEAL-IN

UNITS

CONTACTS

OPERATING

CHARACTERISTICS

PICKUP

RESET

(Tune

Overcurrent

Urift)

OPERATING TIME

BURDENS

CONSTRUCTION

DIRECTIONAL UNIT

LOW

GRADIENT

CONTACT

BARREL

CONTACT

TIME

OVERCURRENT

UNIT

TARGET

AND

SEAL-IN

UNITS

INSTANTANEOUS

OVERCURRENT

UNIT

(DIRECTIONALLY

CONTROLLED)

INSTANTANEOUS

UNIT

(NON-DIRECTIONALLY

CONTROLLED)

RECEIVING,

HANDLING

AND

STORAGE

ACCEPTANCE

TESTS

VISUAL

INSPECTION

MECHANICAL

INSPECTION

TOP

UNIT

(bc)

MIDDLE

UNIT

(TOC)

BOTTOM

UNIT

(DIR)

TARGET

AND

SEAL-IN

UNITS/

INSTANTANEOUS

UNIT

DRAWOUT

RELAYS GENERAL

POWER

REQUIREMENTS

GENERAL

TARGET

AND

SEAL-IN

UNITS

PICKUP

AND

DROPOUT

TEST

TIME

OVERCURRENT

UNIT

CURRENT

SETTING

TIME

SETTING

PICKUP

TEST

TIME

TEST

DIRECTIONAL

UNIT

POLARITY

CHECK

INSTANTANEOUS

UNIT

(DIRECTIONALLY

CONTROLLED)

PICKUP

SETTING

GEK—4985O

CONTENTS

PAGE

INSTANTANEOUS

UNIT (NON-DIRECTIONALLY

CONTROLLED)

INSTALLATION

LOCATION

MOUNTING

CONNECTIONS

INSPECTION

CAUTION

OPERATION

TARGET

AND

SEAL-IN

UNITS

TIME

OVERCURRENT

UNIT

DIRECTIONAL

UNIT

INSTANTANEOUS

OVERCURRENT

UNIT

(DIRECTIONALLY

CONTROLLED)

INSTANTANEOUS

UNIT (NON-DIRECTIONALLY

CONTROLLED)

PERIODIC

CHECKS

AND

ROUTINE

MAINTENANCE

TARGET

AND

SEAL-IN

UNITS

TIME

OVERCURRENT

UNIT

DIRECTIONAL

UNIT

INSTANTANEOUS

OVERCURRENT

UNIT

(DIRECTIONALLY

CONTROLLED)

INSTANTANEOUS

UNIT (NON-DIRECTIONALLY

CONTROLLED)

SERVICING

TARGET

AND

SEAL—IN

UNITS

TIME

OVERCURRENT

UNIT

DISK

AND

BEARINGS

CONTACT

ADJUSTMENT

CHARACTERISTICS

CHECK

AND

ADJUSTMENTS

DIRECTIONAL

UNIT

BEARINGS

CUP

AND

STATOR

CONTACT

ADJUSTMENTS

BIAS

TORQUE

ADJUSTMENT

CLUTCH

ADJUSTMENT

INSTANTANEOUS

OVERCURRENT

UNIT

(DIRECTIONALLY

CONTROLLED)

BEARINGS

CUP

AND

STATOR

CONTACT

ADJUSTMENTS

CLUTCH

ADJUSTMENT

INSTANTANEOUS

UNIT

(NON—DIRECTIONALLY

CONTROLLED)

CONTACT

CLEANING

RENEWAL

PARTS

GEK-49850

PHASE

DIRECTIONAL

OVERCURRENT

RELAYS

WITH

VOLTAGE

RESTRAINT

TYPES JBCV51M

JBCV

5314

JBCV53M(-

)Y1A

JBCV77M

DESCRIPTION

The

Type

JBCV

relays

are

phase

directional

overcurrent relays

with

voltage

restraint.

They

are

used

primarily for

the

protection

feeders

and

transmission

lines.

They

are

available

with

inverse,

very

inverse

or extremely

inverse

time

characteristics.

All

the

JBC

relays

contain

time

overcurrent

unit

of the

induction

disk type,

instantaneous

over-

current

cup

type

unit

and

instantaneous

directional

cup

type

unit.

The

directional

unit

quadrature

polarized

and

directionally

controls

the

operation

of the

time

overcurrent

and

the

instantaneous

over—

current

units.

Because

the

directional

unit

voltage

restrained,

the

JBCV

relays

are

suitable

for

use

those

applications

where

the

maximum

load

current

can

greater

than

the

minimum

available

fault

cur

rent.

Two

target

seal-in

units

are

provided

each

the

relays.

The

operating

coil

each

these

units

respectively

connected

series

with the

contacts

the

time

overcurrent

unit

and

the

instantaneous

overcurrent

unit.

The

contacts

each

seal—in

unit

respectively

are

connected

parallel

with

the

con

tacts

the

time

overcurrent

unit

and

the

instantaneous

overcurrent

unit

to provide

protection

for

them

and

the

associated

control

spring.

Those

relays

having

the

designation

ViA

following the

model

number

also

‘contain

Hi—Seismic

instan

taneous

unit

hinged

armature

construction.

This

unit

non—directional

and

has

self-contained

hand

reset

target

that

will

show

whenever

the

unit

has

operated.

All

the

JBCV

relays

are

mounted

standard

ill

size

drawout

cases;

the

outline

and

panel

drilling

dimensions

for

which

are

shown

Fig.

24.

Internal

connections

for

the

relays

are

shown

Fig.

and

Typical

external

connections

are

shown

Figs.

and 9.

Table

below

lists

the

various

models

and

ranges

that

are

available.

TABLE

EXTENDED

RANGE

JBCV

RELAYS

Relay

Time

Hi-

Pickup

Range

Int.

Model

Characteristic

Seismic

Hi—Seismic

Time

Inst.

Cup

Conn.

JBCV51M(-)A

Inverse

2-16

2—16,

10—80

Fig.

JBCV53M(-)A

Very

Inverse

1.5-12 2-16,

10-80

Fig.

JI3CV53M(-)Y1A

Very

Inverse

Yes

6—150

1.5—12

2—16

Fig.

JBCV77M(-)A

Extremely

mv.

1.5-12

2-16,

10—80

Fig.

These

instructions

not

purport

cover

all

details

variations

equipment

nor

provide

for

every

possible

contingency

met

connection

with

installation,

operation

maintenance.

Should

further

information

desired

should

particular

problen’s

arise

which

are

not

covered

sufficiently for

the

purchaser’s

purposes,

the

matter

should

referred

the

General

Electric

Company.

the

extent

required

the

products

described

herein

meet

applicable

ANSI,

IEEE

and

NEM.4

standards;

but

not

such

assurance

given with

respect

local

codes

and

ordinances

because

they

vary

greatly.

GEK-49850

APPLICATION

The

Type

JBCV

relays

are

phase

directional

overcurrent

relays

that

are

used

primarily

phase

fault

detectors

transmission

line

feeder

protective

relaying

schemes.

JBCV

relays

are

used

for

phase

fault

protection

when

‘rcessary

distinguish

between

fault

conditions

and

maximum

load.

The

relay

prevented

from

trippg

heavy

load

currents

because

the

directional

unit

will

restrained

due

the

system

voltage

being

maintained.

When

fault

occurs,

the

restraining

torque

the

directional

unit

will

collapse

the

voltage

drops,

thus

permitting

the

relay

trip

even

fault

currents

below

the

maximum

load

current.

Each

relay

contains

time

overcurrent

unit

and

instantaneous

overcurrent

unit

that

are

both

torque

controlled

the

instantaneous

directional unit.

The

directional

unit

quadrature

polarized;

i.e.,

the

“a’

phase

relay

uses

‘a”

phase

current

and

‘b—c”

voltage,

etc.

The

angle

maximum

torque of

the

direc

tional unit

approximately

degrees;

i.e.,

maximum

torque

will

occur

for relay

current

lagging

the

unity

power

factor

position

by 45

degrees,

conversely,

leading

the

quadrature voltage

by 45

degrees.

The

differences

between

the various

models

covered

this

instruction

book

are

shown

Table

Inverse

time

relays

should

used

systems

where

the

fault

current

flowing

through

given

relay

influenced

largely

the

system

generating capacity

the

time

the

fault.

Very

inverse

time

and

tremely

inverse

time

relays

should

used

cases

where

the

fault

current

magnitude

dependent

mainly

upon

the

location

the

fault

relation

the

relay,

and

only

slightly

not

all

upon

the

system

generating

setup.

The

reason

for

this

that

relays

must

set

selective

with

maximum

fault

cur

rent

flowing.

For

fault

currents

below

this

value,

the

operating

time

becomes

greater

the

current is

decreased.

there is

wide

range

generating

capacity,

together

with

variation

short-circuit

current

with

fault

position,

the

operating

time

with

minimum

fault

current

may

exceedingly

long

with

very

inverse

time

relays

and

even

longer

with

extremely

inverse

time

relays.

For

such

cases,

the

inverse

time

relay is

applicable.

The

choice

between

very

inverse

and

extremely

inverse

time

relays

limited

than

between

them

and

the

inverse

time

relay

they

are

nearly

alike

their

time—current

characteristic

curves.

For

grading

with

fuses

the

extremely

inverse

time

relay

should

chosen

the

time—current

curves

nearly

match

the

fuse

curve.

Another

advantage

the

extremely

inverse

relay

that

better

suited

than both

the

inverse

and

very

inverse

relays

for

picking

cold

load.

For

any

given cold

load

pickup

capability,

the

resulting

settings

will

provide

faster

protection

high

fault

currents

with

the

extremely

inverse

relay

than with

the

less

inverse

relays.

The

operating

time of

the

time

overcurrent

unit

for

any

given

value

current

and

tap

setting

termined

the

time

dial

setting.

This

operating

time

inversely

proportional

the

current

magnitude

illustrated

the

time

curves

Figs.

11,

and 13.

Note

that

the

current

values

these

curves

are

given

multiples

the

tap

setting.

That

is,

for

given

time

dial

setting,

the

time

will

the

same

for

amperes

the

eight

ampere

tap

for

amperes

the

five

ampere

tap,

since

both

cases,

the

current

ten

times

tap

setting.

selective

action

two

relays is

required,

determine

the

maximum

possible

short-circuit

current

the

line

and

then

choose

time

value

for

each

relay

that

differs

sufficiently

insure

the

proper

sequence

the

operation

the

several

circuit

breakers.

Allowance

must

made

for

the

time

involved

opening

each

breaker

after

the

relay

contacts

close.

The

instantaneous

cup

unit

torque

controlled

the

directional

unit.

When

used

for

direct

tripping,

will

only

necessary

when

determining

setting

consider

the

maximum

current

that

the

instantaneous

unit

will

see

for

fault

the

remote

terminal.

The

instantaneous

cup

unit

has

low

tran

sient

overreach.

should

set

with

margin

least

percent

above

the

maximum

current for

remote

fault

neglecting

transient

overreach.

The

‘(lA

relays

contain

Hi-Seismic

instantaneous

overcurrent

unit.

This

unit

may

set

high

pro

vide

direct

tripping for

heavy

internal

faults.

determining the

setting

for

this

unit

when

used

for

direct

tripping,

will

necessary

consider

the

maximum

external

fault

for

faults

each

end

the

line

because

the

unit

non-directional.

The

unit

should

set

with

suitable

margin

above

the

maximum

external

fault

taking

into

account

the

effects

transient

overreach

illustrated

Fig.

16.

The

red

jumper

leads

between

studs

and

are

located

inside

the

case

the

cradle

block

and

may

removed

provide

external

torque

control

the

time

overcurrent

unit

(TOC)

and

the

instantaneous

overcurrent

unit

(bc)

respectively.

external

torque

control

either

both

units

GEK-49850

required,

remove

the

red

Jumper

lead

associated

with

the

unit(s)

controlled,

and

connect

the

external

control

contacts

between

the

appropriate studs.

Note

that

the

units

will

still

torque

controlled

the

directional

unit

addition

the

external

control.

RAT

INOS

Ratings

the

operating

current

circuits

the

TOC

(time

overcurrent),

directional

controlled

IOC

(instantaneous overcurrent)

and

the

directional

units

are

shown

individually.

However,

since

all

operating

current

circuits

are

normally connected

series,

the

operating

coil

ratings

all

three units

should

considered

determining

the

rating

of the

entire

operating

circuit.

TIME

OVERCURRENT

UNIT

The

one

second

ratings

the

TOC

units,

relay

terminals

and

are

all

260

amperes.

taps

and

the

continuous

ratings

are

shown

Tables

and 4.

Note

that

separate

tables

the

JBCV51,

JBCV53

and

JBCV77

models.

TABLE

The

available

are

given

for

CONTINUOUS

RATING

INVERSE

TIME

OVERCURRENT

UNIT

CONTINUOUS

RATING

EXTREMELY

INVERSE

TIME

OVERCURRENT

UNIT

1.5

—

12.0

AMP

RANGE

JBCV77

TAP

1.5

2.0

2.5

3.0

4.0 5.0

6.0

7.0

8.0

10.0

12.01

RATING

9.5

10.5

11.5

12.5 14.0

15.5

17.0 18.0

19.0

20.0

2O.j

INSTANTANEOUS

OVERCURRENT

UNIT (DIRECTIONALLY

CONTROLLED)

Ranges and

ratings

of the

IOC

units,

relay

terminals

and

are

shown

Table

have

dual

ratings

obtained

series

parallel

connections.

The

operating

coils

TABLE

CONTINUOUS

RATING

VERY

INVERSE TIME

OVERCURRENT

UNIT

TABLE

GEK-

49850

DIRECTIONAL UNIT

The

directional

unit

operating

coil,

relay

terminals

and

has

five

200

ampere

one

second

rating.

The

potential

polarizing

circuit,

terminals

circuit,

terminals

and

10,

are continuously

rated.

INSTANTANEOUS

UNIT

(NON-DIRECTIONALLY

CONTROLLED)

The

instantaneous

unit

coil

tapped

for

operation

either

one

two

ranges

L).

Selection

the

high

low

range

determined

the

position

leads

and

terminal

15.

See

Table

and

the

applicable

interntal

connections

referenced

in Table

For

the

range,

connect

lead

terminal

and

lead

the

auxiliary

terminal

that

mounted

terminal

15.

For

range

reverse

leads

and

TABLE

CONTINUOUS

AND

ONE

SECOND

RATINGS

NON-DIRECTIONALLY

CONTROLLED

IOC

UNIT

One

Continuous

Second

Instantaneous

Range

Rating Rating

Unit

(Amps)

(Amps) (Amps)

150

—

10.2

260

150

19.6

**The

range

approximate,

which

means

that

6-30,

30—150 may

6-28,

28-150.

There

will

always

least

one

ampere

overlap

between

the

maximum

setting

and

the

minimum

setting.

When

ever

possible,

always

select

the

higher

range,

since

has

the

higher

continuous

rating.

TARGET

AND

SEAL-IN

UNIT

The

rating

and

impedance

the

seal-in

unit

for

the 0.2

and

ampere

taps

are

given

Table

The

tap

setting

used

will

depend

the

current

drawn

the

trip

coil.

The

0.2

ampere

tap

for

use

with

trip

coils

which

operate

currents

ranging

from

0.2

2.0

amperes,

the

minimum

control

voltage.

this

tap

used

with

trip

coils

requiring

than

two

peres, there is

possibility

that

the

resistance

seven

ohms

will

reduce

the

current

low

value

that

the

breaker

will

not

tripped.

The

two

ampere

tap

should

used

with

trip

coils

that

take

two

amperes

minimum

control

voltage,

provided

the

current

does

not

exceed

amperes

the

maximum

control

voltage.

the

tripping

current

exceeds

amperes,

the

connections

should

arranged

that

the

induction

unit

contacts

will

operate

auxiliary

relay

which

turn

energizes

the

trip

coil

coils.

such

application,

may

necessary

connect

resistor

parallel

with

the

auxiliary

relay

coil

to allow

enough

current

operate

the

target

seal—in

unit.

TABLE

CONTINUOUS

AND

ONE

SECOND

RATINGS

DIRECTIONALLY

CONTROLLED

IOC

UNIT

Total

Pickup

Continuous

One

Second

Range

Connections

Range

Rating Rating

(Amps)

Amps

(Amps)

2-16

Series

2-8

5.0

200

Parallel

4—16

6.5

260

10-80

Series

10-40

9.0

220

Parallel

20-80

15.0

260

ampere

continuous

rating

and

the

restraint

GEK-

49850

TABLE

SEAL-IN

UNIT

RATINGS

0.2

TAP

2.0

RESISTANCE

10%

(OHMS)

0.13

MIN.

OPERATING

(AMPERES)

0-25%

0.2 2.0

CARRY

CONT.

(AMPERES)

0.3 3.0

CARRY

AMPS

FOR

(SEC.)

0.03

4.0

CARRY

AMPS

FOR

(SEC.)

—

0.25

30.0

IMPEDANCE

(OHMS)

—

52.0 0.53

CON

TACT

The

current—closing

rating

of the

induction

unit

contacts is

amperes

for

voltages

not exceeding

250

volts.

Their

current-carrying rating

limited

the

tap

rating

the

seal—in

unit.

OPERATING

CHARACTERISTICS

PICKUP

rated

voltage

and

maximum

torque

angle,

the

directional

unit

will

pick

percent

amperes.

restraint

voltages

less

than

rated,

the

operating

current

is also

less.

This

relationship

shown

the

curve

Fig.

10.

Pickup

of the

TOC

units

defined

the

current

required

the

contacts

from

the

0.5

time

dial

position.

The

pickup

value

within

five

percent

tap

value.

The

pickup

of the

directionally

controlled

IOC

unit

can

adjusted

over

eight—to—one

range

indicated

in Table

RESET

(TIME

OVERCURRENT

UNIT)

Inverse

time

overcurrent

units

reset

percent

the

minimum

pickup

current,

very

inverse

time

units

percent

and

extremely

inverse

time

units

percent.

When

the

relay

de-energized,

the

time

required

for

the

disk

completely

reset

the

number

time

dial

position

approximately

six

seconds

for

inverse

time

relays

and

seconds

for

very

inverse-

time

and

extremely

inverse-time

relays.

OPERATING TIME

The

time

curves

the

TOC

units

are

shown

Figs.

11,

and

respectively

for

inverse-time,

very

inverse-time

and

extremely

inverse-time

relays.

For

the

same

operating

conditions,

the

relay

will

operate

repeatedly

within

one

two

percent

the

same

time.

The

time

curves

for

the

directionally

controlled

IOC

units

are

shown

Fig.

14.

The

time—current

characteristic

the

Hi—Seismic

non—directionally

controlled

TOC

unit

shown

Fig.

and

its

transient

overreach

characteristic

shown

Fig.

16.

BURDENS

Tables

and

give

the

directional

unit

burdens

of the

potential

and

current

circuits

respectively.

Table

gives the

total

burden

of the

time

overcurrent

unit

plus

the

instantaneous

overcurrent

unit.

GEK-49850

TABLE

DIRECTIONAL UNIT

POTENTIAL

CIRCUIT

BURDENS

CYCLES

AND

RATED

VOLTS

VOLT

POWER

WATTS

CIRCUIT

AMPERES

FACTOR

Polarizing

15.2

0.93

14.1

Restraint

5.9

0.66

3.9

IMPED.

VOLT-

POWER

(OHMS)

AMPERES

FACTOR

0.12

3.00

0.52

RANGE

BURDENS

MIN.

PICKUP

BURDEN

OHMS

(Z)

TIME

———

MIN.

TAP

TOC

UNIT

CHARACTER-

TOC

IOC

UNIT

TIMES

AT 5

ISTIC

UNIT

CONNECTIONS

+VA

P.F.

MIN.

P.U.

MIN.

P.U.

AMPS

2-16

Series

2-8

0.61

2.01

2.10

8.4

0.29

1.21 0.85

Parallel

4-16

0.42

1.54

1.60

6.4

0.26 0.76 0.43

Inverse

2-16

10-80

Series

10-40

0.45

1.58

1.65

6.6

0.27

0.81

0.48

Parallel

20-80

0.38

1.45

1.50

6.0

0.25

0.67

0.34

2—16

Series

2—8

0.47

1.10

1.20

2.7

0.39

1.20 0.53

Very

Parallel

4-16

0.28

0.63

0.69 1.6

0.41

0.69

0.47

Inverse

1.5-12

10-80

Series

10-40

0.31

0.67

0.74

1.7

0.42

0.74

0.52

Parallel

20-80

0.24 0.54 0.59

1.3

0.41

0.59

0.38

2-16

Series

2-8

0.33 0.72

0.79

1.8

0.42 0.79

0.70

Extremely

Parallel

4-16

0.13 0.25

0.28

0.5

0.46

0.28

Inverse

1.5-12

10-80

Series

10-40

0.16

0.29

0.33

0.7

0.49 0.33 0.33

Parallel

20-80

0.10 0.16

0.19

0.4

0.53

0.19

**The

impedance

values

given

are

those

for

the

nhiriinium

tap

each

relay.

The

impedance

for

other

taps,

pickup

current

(tap

rating),

varies inversely

approximately

the

square

the

current

rating.

Example:

for

the

very

inverse

relays,

1.5/12

amperes, with

impedance

the

1.5

ampere

tap

1.20

ohms,

the

impedance

the

three

ampere

tap,

three

amperes,

approximately

(1.5/3)2

12O

0.3

ohms.

+Sorne

companies

list

relay

burdens

only

the volt-ampere

input

operate

minimum

pickup.

This

column

included

direct

comparison

can

made.

should

not

used in

calculating

volt—ampere

burdens

secondary

circuit,

since

the

burden

five

amperes

used

for

this

purpose.

*Calculated

from

burden

minimum

pickup.

TABLE

DIRECTIONAL

UNIT

CURRENT

CIRCUIT

BURDENS

CYCLES

AND 5

AMPS

TABLE

BURDENS

OVERCURRENT

UNITS

(TIME

AND

INSTANTANEOUS)

CYCLES

K-4

9850

TABLE

BURDEN OF

NON-DIRECTIONALLY

CONTROLLED

INSTANTANEOUS

UNIT

Inst

Unit

Ran

Mm.

Burdens

Mm.

Burdens

Ohms

(Z)

Range

Pickup

(Ohms)

Tinies

Pickup

(Amps)

10 20

6-30

0.110 0.078 0.135 0.095

0.081

0.079

6-150

30-150

0.022

0.005

0.023 0.022

0.022 0.022

CONSTRUCTION

Type

JBCV

relays

are

single

phase,

directional

overcurrent

relays

with

voltage

restraint.

They

are

available

with

inverse,

very

inverse

extremely

inverse

time-current

characteristics.

The

JBCV

relays

consist

three

main

units,

instantaneous

overcurrent

unit

(top)

of the

induction-cup

type,

time

overcurrent

unit

(middle)

the

induction—disk

type,

and

instantaneous

power—directional

unit

(bottom)

the

induction-cup

type.

The

directional

unit

is potential

polarized

and,

means

its

closing

con

tacts,

directionally

controls

the

operation

both

the

time

overcurrent

and

instantaneous

overcurrent

units.

All

units

are

mounted

the

L2,

(large

double—ended)

drawout

case.

The

IOC

(instantaneous

over—

current) unit

and

the

TOC

(time

overcurrent)

unit

each

have

associated

target

and

seal-in

unit.

The

JBCV53M(-)Y1A,

shown

Table

has

additional

IOC

unit

which

the

hinged

armature

type.

DIRECTIONAL UNIT

The

directional

unit

the

induction-cylinder

construction

with

laminated

stator

having

eight

poles

projecting

inward

and

arranged symmetrically

around

stationary

control

core.

The

cup-like

aluminum

induction

rotor

free

operate

the

annular

air

gap

between

the

poles

and

the

core.

The

poles

are

fitted

with

voltage

restraint,

current operating,

and

potential

polarizing

coils.

The

principle

which

torque

developed

the

same

that

induction

disk

relay

with

wattinetric

element,

although,

arrangement

parts,

the

unit

split—phase

induction

motor.

The

induction—cylinder

construction

provides higher

torque

and

lower

rotor

inertia

than

the

induction—disk

construction,

resulting

faster

and

sensitive

relay.

Low

Gradient

Contact

The

directional

unit

contacts

(left

front),

which

control

the

time

overcurrent

unit

are

shown

Fig.

17. They

are

the

low

gradient

type

specially

constructed

minimize

the

effects

vibration.

Both

the

stationary

and

moving

contact

brushes

are

made

low

gradient

material

which,

when

subjected

vibration,

tend to

one

another,

hence,

they

resist

contact

separation.

The

contact

dial

(A)

supports

the

stationary

contact

brush

(B)

which

mounted

conical

contact

tip

(C).

The

moving

contact

arm

(D)

supports

the

moving

contact

brush

(E)

which

mounted

button

contact

tip

(F).

The

end

the

moving

contact

brush

bears

against

the

inner

face

the

moving

contact

brush

retainer

(B).

Similarly,

the

end

the

stationary

contact

brush

bears

against

the

inner

face

the

stationary

contact

brush

retainer

(H).

The

stationary

contact

support

(K)

and

the

contact dial

are

assembled

together

means

mounting

screw

(L)

and

two

locknuts

(N).

Barrel

Contact

The

directional

unit

contacts

(right

rear),

which

control

the

instantaneous

overcurrent

unit,

are

shown

Fig.

18.

They

are

specially

constructed

suppress

bouncing.

The

stationary

con

tact

(B)

mounted

flat

spiral

spring

(F) backed

up by

thin

diaphragm

(C).

These

are

both

mounted

slightly

inclined

tube

(A).

stainless

steel

ball

(B)

placed

the

tube

before

the

diaphragm

assembled.

When

the

moving

contact

hits

the

stationary

contact,

the

energy

the

former

imparted

the

latter

and

thence

the

ball,

which

free

roll

the

inclined

tube.

Thus,

the

moving

contact

comes

rest

with

substantially

rebound

vibration.

change

the

stationary

contact

mounting

spring,

remove

the

contact barrel

and

sleeve

complete

unit

after

loosening

the

screw

the

front

the

contact

block.

Unscrew

the

cap

(E).

The

contact

and

its

flat

spiral

mounting

spring

may

then

removed.

K-49850

TIME

OVERCURRENT

UNIT

The

inverse

time

and

very

inverse

time

overcurrent

units consist

tapped

current

operating

coil

wound on

U—magnet

iron

structure.

The

tapped

operating

coil

connected to

taps

the

tap

block.

The

U-magnet

contains

wound

shading

coils

which

are

connected

series

with

directional

unit contact.

When

power

flow

such

direction

the

directional

unit contacts,

the

shading

coils

act

produce

split-phase

field

which,

turn,

develops

torque

the

operating

disk.

The

extremely

inverse

time

overcurrent

unit

of the

wattmetric

type

similar

that

used

watthour

meters

except

follows:

the

upper

portion

the iron

structure

has

two

concentric

windings

the

mid

dle

leg

the

magnetic

circuit.

One

these is

tapped

current

winding

connected

taps

the

tap

block;

the

other

floating

winding

which

connected

series

with

the

directional

unit

contacts,

resistor,

capacitor

and

the

two

coils

the

lower

legs

the

magnetic

circuit.

When

power

such

direction

directional

unit

contact,

the

unit

develops

torque

the

operating

disk.

The

disk

shaft

carries

the

moving

contact

which

completes

the

trip

circuit

when

touches the

sta

tionary contact

contacts.

The

shaft

restrained

spiral

spring

give

the proper

contact-closing

current,

and

its

motion

retarded

permanent

magnet

acting

the

disk

produce

the

desired

time

characteristic.

The

variable

retarding

force

resulting

from

the

gradient

of the

spiral

spring is

compen

sated

the

spiral

shape

the

induction

disk,

which

results

increased

driving

force

the

spring

winds

up.

The

torque

control

circuits

both

the

time

overcurrent

and

instantaneous

overcurrent units

are

wired

terminals

the

relay

contact

block.

These

terminals

are shorted

together

internally

connected

red

jumper

leads

when

the

relays

leave

the

factory

(see

Figs.

inclusive).

external

torque

con

trol

desired,

these

jumper

leads

should

removed.

TARGET

AND

SEAL-IN

UNITS

The

seal-in

units

for

both

the

TOG

and

lOG

contacts

the

JBCV51M,

JBCV53M

and

JBCV77M

relays

are

mounted

the

lOG

middle

unit.

the

JBCV53M(-)Y1A

relay

the

right

hand

seal—in

unit

replaced

the

non—directionally

controlled

lOG

unit

and

the

seal—in

unit

moved

the

left

side

the

directional

(lower)

unit.

The

left

seal-in

unit

operates

conjunction

with

the

time

overcurrent

unit

contacts

and

labeled

TIME”.

Its

coil

series

and

its

contacts

parallel

with

the

main

contacts

the

time

overcurrent

unit

that

when

the

main

contacts

close,

the

seal—in

unit

will

pick

and

seal

around

the

main

con

tact.

The

right seal-in

unit,

labeled

“INST.

operates

conjunction

with

the

instantaneous

overcurrent

unit.

Its

coil

series

with

the

instantaneous

unit

contact

and

contact

the

directional

unit,

and

its

contact

connected

seal

around

these

two

contacts

when

the

unit

operates.

Both

seal—in

units

are

equipped

with

targets

which

are

raised

into

view

when

the

unit operates.

These

targets

latch

and

remain exposed

until

manually

released

means

the button

projecting

below

the

lower—

left

corner

the

cover.

INSTANTANEOUS

OVERCURRENT

UNIT

(DIRECTIONALLY

CONTROLLED)

The

instantaneous

overcurrent

unit

similar

construction

the

directional

unit

described

above,

differing

only

coil turns

and

connections.

The

four corner

coils

consist

two

windings,

inner

winding

consisting

large

number

turns

fine

wire,

and

outer

winding

having

few

turns

heavy

wire.

The

outer

windings

the

corner

coils

are

connected

either

series

parallel

with

the

side

coils

tap

links

provided

the

relay;

these

series

parallel

combinations

are

connected

series

with

the

operating

coil

the

TOG

unit.

The

inner

windings

the corner

coils

are

all

connected

series,

and

turn

are

connected

series

with

capacitor

and

contact

the

directional

unit.

This

circuit

thus

controls

the

torque

of the

instantaneous

overcurrent

unit.

When

the

directional

unit

contacts

are

open,

the

instantaneous

overcurrent

unit

will

develop

torque.

When

the

directional

unit

contacts

are

closed,

the

instantaneous

overcurrent

unit

will

develop

torque in

proportion

the

square

the

current.

The

instantaneous

overcurrent

unit

develops

operating

torque

direction

opposite

that

the

directional

unit.

This

makes

the

relay

less

susceptible

the

effects

shock.

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