ABB ITH-T Series Guide

771.2

INSTALLATION

OPERATION

•

MAINTENANCE

INSTRUCTIONS

ABB

ASEA

BROWN

BOVERI

TYPE

ITH

RELAY

(

PRELIMINARY

EDITION

)

CAUTION

down

vertical

guide

rod

the

center

the

solenoid

coil

The

plunger

assembly

consists

bushing

which

threaded

the

moving

plunger

and

locked

place

nut

and

silver

disc

which

rests

helical

compres

sion

spring

the

lower

end

the

plunger

The

guide

rod

fastened

the

stationary

core

which

turn

held

place

the

insulating

plate

which

the

stationary

contacts

are

mounted

The

stationary

core

consists

two

steel

sections

separated

non

magnetic

ring

This

non

magnetic

ring

provides

air

gap

which

the

plunger

steel

floats

When

the

coil

energized

the

plunger

assembly

moves

upward

carrying

the

silver

disc

which

bridges

three

spring

type

conical

shaped

station

ary

contacts

this

position

the

helical

spring

com

pressed

and

the

plunger

free

move

while

the

contact

disc

remains

stationary

Thus

vibrations

the

plunger

assembly

are

prevented

from

causing

contact

chattering

Micarta

disc

which

acts

shield

for

the

contact

plate

screws

the

bottom

the

guide

rod

and

locked

into

position

small

nut

The

adjustable

screw

the

top

the

frame

provides

the

principal

means

for

adjusting

the

current

operating

values

Before

putting

relays

into

service

remove

all

blocking

which

may

have

been

inserted

for

the

pur

pose

securing

the

parts

during

shipment

make

sure

that

all

moving

parts

operate

freely

inspect

the

contacts

see

that

they

are

clean

and

prop

erly

and

operate

the

relay

check

the

setting

and

electrical

connections

APPLICATION

This

phase

relay

with

individual

phase

indication

intended

for

use

applications

where

nondirectional

high

dropout

ratio

overcurrent

unit

required

and

short

time

delay

needed

prevent

operation

such

things

transformer

inrush

current

offset

cur

rent

This

relay

may

used

the

supply

side

transformer

provide

improved

sensitivity

and

still

coordinate

time

basis

with

downstream

devices

3.2

Contactor

Switch

CONTENT

The

contactor

switch

the

relay

small

sole

noid

type

switch

cylindrical

plunger

with

silver

disc

mounted

its

lower

end

moves

the

core

the

solenoid

The

relay

consists

three

high

drop

out

instantane

ous

units

with

equal

number

operation

indicators

one

contactor

switch

and

timing

circuit

the

plunger

travels

upward

the

disc

bridges

three

silver

stationary

contacts

The

coil

series

with

the

main

contacts

the

relay

and

with

the

trip

coil

the

breaker

When

the

relay

contacts

the

coil

comes

energized

and

closes

the

switch

contacts

This

shunts

the

main

relay

contacts

thereby

relieving

them

the

duty

carrying

tripping

current

These

contacts

CONSTRUCTION

3.1

The

High

Drop

Out

Instantaneous

Trip

Unit

(

ITH

)

The

high

drop

out

instantaneous

trip

unit

small

solenoid

type

device

plunger

assembly

rides

and

All

possible

contingencies

which

may

arise

during

installation

operation

main

tenance

and

all

details

and

variations

this

equipment

not

purport

covered

these

instructions

further

information

desired

purchaser

regarding

his

particular

installation

operation

maintenance

his

equipment

the

local

ASEA

BROWN

BOVERI

representative

should

contacted

Courtesy of NationalSwitchgear.com

771.2

makes

the

calibrating

scale

non

linear

and

silicon

controlled

rectifier

(

SCR

)

The

printed

circuit

also

con

tains

diode

(

)

reverse

bias

SCR

resistor

(

)

and

diode

(

)

protect

the

static

components

from

the

inductive

voltage

kick

associated

with

the

telephone

relay

coil

and

series

diodes

(

and

)

which

compensate

for

the

forward

voltage

drop

through

SCR

and

zener

reference

variations

provide

seal

function

and

remain

closed

until

the

trip

circuit

opened

the

auxiliary

switch

the

breaker

3.3

Operation

Indicator

This

operation

indicator

small

solenoid

coil

con

nected

the

trip

circuit

When

the

coil

energized

spring

restrained

armature

releases

the

white

target

which

falls

gravity

indicate

completion

the

trip

circuit

The

indicator

may

reset

from

the

outside

the

case

3.9

Telephone

Relay

(

)

The

telephone

relay

(

)

energized

SCR

the

conclusion

the

time

delay

The

coil

energized

least

three

times

pick

wattage

insure

positive

contact

operation

The

contacts

are

made

palladium

and

are

suitable

for

circuit

breaker

trip

duty

proven

many

years

experience

other

relays

3.4

Timing

Function

The

circuit

consists

reference

voltage

circuit

rheostat

(

)

and

scale

plate

voltage

biasing

potenti

ometer

(

)

timing

circuit

containing

static

timing

components

and

output

telephone

relay

(

)

OPERATION

The

ITH

unit

current

operated

device

which

will

pick

within

the

range

stamped

the

side

the

frame

and

drop

out

greater

the

pick

current

value

The

position

the

core

screw

deter

mines

the

pick

value

for

particular

contact

gap

The

drop

out

ratio

accomplished

through

the

right

combination

plunger

steel

setting

electrical

pull

and

spring

strength

The

most

important

factor

the

adjustment

the

unit

the

correct

positioning

the

plunger

steel

with

respect

the

stationary

core

air

gap

3.5

Reference

Voltage

Circuits

The

reference

voltage

circuit

provides

fixed

supply

voltage

the

time

delay

circuit

and

protects

the

static

components

from

high

voltages

consists

silicon

power

regulator

and

series

resistor

(

)

The

silicon

power

regulator

(

)

watt

Zener

diode

mounted

the

printed

circuit

board

The

series

resistor

(

)

inch

resistor

which

tapped

for

125

volt

relays

Operation

the

timing

circuit

occurs

when

silicon

controlled

rectifier

(

SCR

)

switches

from

non

con

ducting

state

conducting

state

the

non

conduct

ing

state

the

SCR

acts

opened

switch

prevent

energization

the

telephone

relay

(

)

but

the

con

ducting

state

acts

closed

switch

connect

the

telephone

relay

the

source

switch

the

SCR

from

non

conducting

state

conducting

state

quires

that

maximum

microamperes

flow

the

gate

the

SCR

This

current

produced

the

differ

ence

voltage

across

the

capacitor

(

)

and

the

brush

the

potentiometer

(

)

3.6

Rheostat

and

Scale

Plate

The

rheostat

(

)

provides

variable

resistance

for

the

time

delay

circuit

wire

wound

construc

tion

which

minimizes

resistance

change

with

tempera

ture

not

remove

the

knob

from

the

rheostat

shaft

since

not

easy

replace

the

knob

the

calibrated

position

The

timing

scale

non

linear

explained

the

section

under

Timing

Circuit

3.7

Potentiometer

The

potentiometer

(

)

provides

biasing

voltage

which

keeps

the

silicon

controlled

rectifier

(

SCR

)

turned

off

until

the

capacitor

voltage

reaches

the

poten

tiometer

brush

voltage

wire

wound

construction

and

has

locking

nut

which

should

not

loosened

unless

the

relay

being

calibrated

When

the

ITH

unit

any

phase

picked

the

respective

operation

indicator

drops

its

flag

and

the

timing

circuit

energized

Voltage

instantaneously

appears

across

the

potenti

ometer

brush

but

delayed

building

across

the

capacitor

accordance

with

the

time

constant

the

circuit

long

the

capacitor

voltage

less

than

the

potentiometer

brush

voltage

reverse

voltage

pears

across

the

diode

and

the

SCR

keep

the

silicon

controlled

rectifier

(

SCR

)

biased

off

When

the

capacitor

voltage

reaches

the

potentiometer

brush

volt

3.8

Timing

Circuit

The

timing

circuit

contains

diode

(

)

which

pro

tects

the

static

components

case

the

relay

con

nected

with

reverse

polarity

time

limiting

resistor

(

)

timing

capacitor

(

)

parallel

resistor

(

)

which

Courtesy of NationalSwitchgear.com

771.2

age

plus

approximately

one

volt

(

forward

voltage

drop

across

SCR

and

)

gate

current

will

flow

the

silicon

controlled

rectifier

(

SCR

)

This

current

switches

the

SCR

conducting

state

allow

the

telephone

relay

(

)

pickup

5.2

Contactor

Switch

The

SCR

latches

when

switches

and

can

reset

only

removing

voltage

from

terminal

The

contactor

switch

operated

switch

with

pick

2.0

amperes

The

rate

which

the

capacitor

charges

deter

mined

the

rheostat

setting

The

charging

rate

not

linear

function

rheostat

setting

since

gives

parallel

resistive

path

This

has

the

effect

expanding

the

scale

for

short

times

and

thereby

permitting

accurate

settings

5.3

Operation

Indicator

The

operation

indicator

1.0

ampere

operated

indicator

with

pick

its

rated

value

CONTACT

CIRCUIT

CONSTANTS

CHARACTERISTICS

Resistance

2.0

ampere

Contactor

Switch

Resistance

1.0

ampere

Operation

Indicator

5.1

ITH

Unit

0.25

ohms

The

range

for

the

instantaneous

units

amperes

0.16

ohms

Time

Delay

Range

and

Voltage

Rating

The

unit

has

nominal

range

pick

adjust

ment

with

greater

drop

out

ratio

the

core

screw

the

top

the

unit

used

change

the

setting

The

maximum

core

screw

setting

ten

turns

out

from

the

fully

bottomed

position

the

maximum

end

the

range

may

necessary

increase

the

contact

gap

obtain

the

desired

pick

long

the

setting

the

unit

within

its

nominal

rating

the

drop

out

ratio

will

greater

Time

Delay

Range

(

Seconds

)

Voltage

Rating

(

Volts

)

125

1.0

6.1

Battery

Drain

Volts

125

Volts

The

nominal

range

may

extended

increasing

the

contact

gap

with

the

core

screw

its

maximum

position

The

drop

out

ratio

for

settings

above

the

nominal

range

will

below

For

example

for

pick

setting

three

times

the

minimum

setting

the

drop

out

ratio

will

approximately

Likewise

for

setting

four

times

the

minimum

setting

the

drop

out

ratio

will

approximately

STAND

OPERATING

270

180

6.2

Voltage

Rating

Over

The

Temperature

Range

The

relay

can

stand

110

voltage

continuously

over

temperature

range

The

burden

this

unit

minimum

pick

0.44

hertz

6.3

Reverse

Polarity

Characteristic

operating

times

for

the

unit

over

its

nominal

range

are

Diode

(

)

limits

reverse

voltage

the

static

compo

nents

less

than

one

volt

that

damage

done

the

circuit

connecting

the

relay

with

reverse

polar

ity

However

the

relay

will

course

not

operate

under

this

condition

and

series

resistor

(

)

may

over

heat

reverse

voltage

applied

for

approximately

minutes

Less

than

cycle

200

trip

value

cycle

500

trip

value

cycle

1000

trip

value

Continuous

current

rating

the

coil

times

mini

mum

pick

value

6.4

Reset

Time

One

second

rating

approximately

times

mini

mum

pick

drop

out

time

0.1

sec

less

Courtesy of NationalSwitchgear.com

771.2

Discharge

timing

capacitor

the

discharge

essentially

instantaneous

the

time

constant

through

being

less

than

milliseconds

most

cases

However

the

discharge

path

through

lim

ited

silicon

voltage

drops

through

SCR

and

totalling

approximately

one

volt

Therefore

dis

charges

rapidly

through

down

about

one

volt

and

then

slowly

through

down

zero

volts

CALIBRATION

8.1

ITH

Unit

This

unit

prior

shipment

adjusted

for

minimum

pick

value

that

the

lower

value

marked

the

side

the

frame

The

following

procedure

used

when

changing

this

setting

over

the

indicated

range

where

higher

drop

out

ratio

desired

Connect

the

coil

the

unit

series

with

ammeter

and

adjustable

load

Apply

the

desired

pick

current

then

adjust

the

core

screw

until

the

plunger

just

picks

Lock

core

screw

securely

place

6.5

Accuracy

The

accuracy

the

time

delay

depends

upon

the

repetition

rate

consecutive

timings

the

supply

volt

age

the

ambient

temperature

and

the

ITH

contact

debounce

Self

heating

has

negligible

effect

the

time

accuracy

desired

set

the

unit

for

either

different

drop

out

ratio

over

the

nominal

range

for

pick

values

above

the

nominal

range

then

the

following

procedure

should

followed

consecutive

timings

incomplete

capacitor

dis

charge

will

cause

changes

time

delay

These

changes

are

function

discharge

rate

With

the

desired

drop

out

current

applied

adjust

the

core

screw

until

the

plunger

assembly

just

drops

out

Then

apply

the

desired

pick

current

and

adjust

the

Micarta

contact

shield

until

the

plunger

just

picks

recommended

that

the

contact

gap

should

not

made

less

than

013

inch

The

contact

gap

may

determined

turning

the

contact

shield

from

the

setting

position

until

the

contacts

just

Changes

ambient

temperature

cause

changes

time

delay

This

variation

time

delay

direct

func

tion

capacitance

change

with

temperature

Typical

variation

time

delay

with

temperature

shown

Figure

ACCEPTANCE

CHECK

One

turn

the

shield

equal

018

inch

contact

gap

timing

check

minimum

and

maximum

settings

recommended

insure

that

the

relay

proper

work

ing

order

The

factory

adjustment

the

position

the

plunger

steel

provides

drop

out

ratio

over

the

nominal

range

But

the

event

considerable

amount

material

removed

from

the

contacts

due

repeated

operations

burnishing

etc

the

drop

out

ration

may

fall

below

this

occurs

the

plunger

steel

should

screwed

own

compensate

for

the

change

the

con

tact

gap

However

the

plunger

steel

changed

the

relay

must

recalibrated

The

following

procedure

should

used

recalibrate

the

relay

recommended

test

circuit

shown

Figure

Set

rheostat

minimum

and

later

maximum

Apply

times

the

rated

phase

current

through

Termi

nals

and

Check

respective

operation

indication

and

time

delay

per

Table

Set

the

core

screw

ten

turns

from

its

bottom

position

Adjust

the

plunger

steel

position

the

plunger

until

the

current

value

which

the

plunger

drops

out

the

maximum

rated

current

Then

set

the

contact

gap

turn

down

and

adjust

the

core

screw

for

pick

Drop

out

value

will

above

this

setting

desired

the

contact

gap

and

may

increased

lowering

the

contact

shield

and

readjusting

the

core

screw

for

pick

Delay

Relay

Rating

Between

Readings

1.0

sec

least

sec

Allowing

contact

debounce

typically

Repeat

for

phases

and

for

all

phases

for

minimum

and

maximum

time

values

8.2

Contactor

Switch

Turn

the

relay

side

down

Screw

the

core

Courtesy of NationalSwitchgear.com

771.2

screw

until

the

contact

ring

starts

rotating

Now

back

off

the

core

until

the

contact

ring

stops

rotating

Back

off

the

core

screw

one

turn

and

lock

place

Adjust

the

two

nuts

the

bottom

the

switch

that

there

inch

clearance

between

the

moving

contact

ring

and

the

stationary

contacts

the

open

position

The

guide

rod

may

used

scale

has

threads

per

inch

therefore

turns

the

nut

will

equal

approxi

mately

inch

The

contactor

switch

operated

switch

with

pick

2.0

amperes

)

Place

the

knob

the

rheostat

shaft

such

position

that

the

times

are

symmetrical

with

spect

the

scale

plate

markings

Tighten

the

knob

set

screw

and

mark

calibration

lines

the

scale

plate

When

striking

calibration

lines

for

delays

above

0.5

seconds

pause

least

sec

onds

between

readings

See

action

under

Accu

racy

for

discussion

this

INSTALLATION

8.3

Operation

Indicator

The

relay

should

mounted

switchboard

panels

their

equivalents

location

free

from

dirt

moisture

excessive

vibration

and

heat

Mount

the

relay

vertically

means

the

rear

mounting

stud

studs

for

the

type

projection

case

means

the

four

mounting

holes

the

flange

for

the

semi

flush

type

case

Either

the

stud

the

mounting

screws

may

utilized

for

grounding

the

relay

External

toothed

washers

are

provided

for

use

the

locations

shown

the

outline

and

drilling

plan

facilitate

making

good

electrical

connection

between

the

relay

case

its

mounting

screws

studs

and

the

relay

panel

Ground

wires

are

affixed

the

mounting

screws

studs

required

for

poorly

grounded

insulating

panels

Other

electrical

connec

tions

may

made

directly

the

terminals

means

screws

for

steel

panel

mounting

the

terminal

stud

furnished

with

the

relay

for

thick

panel

mounting

The

terminal

stud

may

easily

removed

inserted

locking

two

nuts

the

stud

and

then

turning

the

proper

nut

with

wrench

the

main

relay

contacts

and

pass

rated

indicator

current

through

the

trip

circuit

Adjust

the

operation

indicator

moving

the

flag

holder

such

that

the

indicator

operates

with

the

application

the

current

8.4

Telephone

Type

Relay

Adjustment

Adjust

the

armature

gap

the

telephone

type

relay

approximately

004

inch

with

the

armature

closed

This

done

with

the

armature

set

screw

and

lock

nut

Also

adjust

contact

leaf

springs

obtain

least

015

inch

gap

all

contacts

and

least

005

inch

all

normally

closed

contacts

8.5

Rheostat

Knob

Adjustment

Same

Scale

Plate

necessary

replace

the

rheostat

(

)

the

silicon

power

regulator

(

)

the

relay

may

recali

brated

with

the

same

scale

plate

most

cases

This

done

rotating

the

rheostat

shaft

without

knob

until

time

delay

equal

the

minimum

scale

marking

tained

Then

align

the

knob

for

this

delay

and

tighten

the

knob

set

screw

securely

Pause

several

seconds

between

readings

for

all

delays

above

seconds

See

section

under

Accuracy

for

this

discussion

For

detail

information

the

case

refer

076

8.6

Scale

Plate

Calibration

New

Scale

Plate

necessary

replace

the

potentiometer

(

)

the

printed

circuit

the

relay

should

recalibrated

with

new

scale

plate

Use

the

following

procedure

)

With

the

knob

off

the

shaft

set

the

rheostat

(

)

maximum

)

Adjust

(

)

that

the

times

are

longer

than

the

maximum

scale

marking

)

Set

the

rheostat

(

)

minimum

and

check

that

times

are

less

than

equal

the

minimum

scale

marking

not

adjust

slightly

reduce

times

Tighten

lock

nut

Courtesy of NationalSwitchgear.com

771.2

LIST

FIGURES

Figure

Description

Drawing

Test

Circuit

9651

Typical

Time

Delay

Variation

with

Temperature

187

526

ITH

Internal

Schematic

9651

ITH

External

Schematic

1500

ITH

Relay

Rear

View

Courtesy of NationalSwitchgear.com

771.2

FRONT

VIEW

ITH

iiw

ITH

TIMING

CIRCUIT

ITH

’

TIMER

STOP

(

VOLTAGE

RISC

)

POSITIVE

RESISTIVE

LORD

NEGHTIVE

RESISTIVE

LORD

120

VBC

TIMER

START

(

MAKE

CONTACT

)

RESISTIVE

LORD

PICKUP

RESISTIVE

AND

COMBINED

CURRENT

Sub

9651

Figure

Test

Circuit

Courtesy of NationalSwitchgear.com

771.2

Figure

Typical

Time

Delay

Variation

with

Temperature

Courtesy of NationalSwitchgear.com

771.2

CHASSIS

OPERATED

SHORTING

SWITCH

CURRENT

TEST

JACK

ITH

ITH ITH

RED

HANDLE

TEST

SWITCH

0 0

TERMINAL

FRONT

VIEW

Sub

9651

Figure

ITH

Internal

Schematic

Courtesy of NationalSwitchgear.com

771.2

POS

ITH

OTHER

DEVICES

XIL

125

—

TlfCR

0.05

1.05

INSTRWTRNEOUS

TIfC

POWER

CIRCUIT

BRERKER

PCB

TRIP

COIL

hCG

(

HUX

SWITCH

SCHEMATIC

Sub

1500

Figure

External

Schematic

Courtesy of NationalSwitchgear.com

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