GE IRT51E Manuale utente

GEK

86038

INSTRUCTIONS

TEMPERATURE

RELAY

TYPES

IRT

GENERAL

ELECTRIC

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GEK

86038

CONTENTS

PAGE

DESCRIPTION

INTRODUCTION

APPLICATION

RATINGS

BURDENS

CONSTRUCTION

RECEIVING

HANDLING

AND

STORAGE

INSTALLATION

PROCEDURE

OPERATING

UNIT

VOLTAGE

CONNECTIONS

AUXILIARY

CIRCUIT

CONNECTIONS

RTD

CONNECTIONS

INSPECTION

ACCEPTANCE

TESTS

PERIODIC

CHECKS

AND

ROUTINE

MAINTENANCE

VISUAL

INSPECTION

MECHANICAL

INSPECTION

AND

ADJUSTMENTS

CONTACT

INSPECTION

AND

CLEANING

AUXILIARY

BRUSHES

RHEOSTAT

CLEANING

ELECTRICAL

TESTS

CALIBRATION

PROCEDURE

RENEWAL

PARTS

LIST

TABLES

2 2

LIST

ILLUSTRATIONS

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GEK

86038

TEMPERATURE

RELAY

TYPES

IRT

DESCRIPTION

INTRODUCTION

The

type

IRT

temperature

sensing

relays

are

designed

for

use

with

single

element

three

lead

resistance

temperature

detectors

(

RTD

)

Models

are

available

for

use

with

the

following

specific

type

RTD

ohm

copper

RTD

100

ohm

platinum

RTD

120

ohm

nickel

RTD

The

models

are

listed

Table

The

type

IRT

relays

will

provide

overtemperature

protection

either

trip

alarm

for

any

apparatus

that

equipped

with

one

the

listed

RTDs

continuously

adjustable

over

temperature

sensing

range

165

The

relays

are

These

relays

are

the

wattmetric

induction

disk

type

and

provide

various

contact

combinations

described

below

The

measuring

circuit

similar

Wheatstone

Bridge

except

that

two

adjacent

legs

the

bridge

are

replaced

transformer

secondary

windings

The

primary

winding

this

transformer

forms

the

polarizing

coil

the

wattmetric

unit

The

type

IRT

relay

overtemperature

sensing

relay

having

single

normally

open

contact

with

target

seal

unit

shown

Figure

The

relay

furnished

single

end

small

size

drawout

case

The

IRT

relay

overtemperature

sensing

relay

having

both

normally

open

and

normally

closed

output

contacts

These

contacts

are

provided

auxiliary

unit

(

)

operating

from

the

main

induction

disk

unit

contacts

pickup

seal

knock

down

circuit

shown

Figure

The

relay

self

resetting

when

the

detected

temperature

falls

below

preselected

level

This

reset

temperature

continuously

adjustable

over

range

from

below

the

set

operating

temperature

manual

reset

target

included

which

operated

contact

the

auxiliary

unit

The

relay

mounted

single

end

small

size

drawout

case

The

type

IRT

overtemperature

sensing

relay

providing

two

normally

open

and

two

normally

closed

electrically

separate

output

contacts

provided

two

position

latching

relay

whose

operating

coil

(

)

and

reset

coil

(

)

are

controlled

the

left

hand

(

IRT

)

and

right

hand

(

IRTR

)

contacts

respectively

These

contacts

are

These

instructions

not

purport

cover

all

details

variations

equipment

nor

provide

for

every

possible

contingency

met

connection

with

installation

further

information

desired

should

particular

problems

arise

which

are

not

covered

sufficiently

for

the

purchaser

purposes

the

matter

should

referred

the

General

Electric

Company

the

extent

required

the

products

described

herein

meet

applicable

ANSI

but

such

assurance

given

with

respect

local

codes

and

ordinances

because

they

vary

greatly

Should

operation

maintenance

IEEE

and

NEMA

standards

;

Courtesy of NationalSwitchgear.com

GEK

86038

the

main

induction

disk

unit

shown

Figure

The

relay

operates

the

normally

open

output

contacts

whenever

the

detected

temperature

exceeds

the

set

value

These

output

contacts

can

reset

manually

electrically

self

reset

means

external

connections

but

only

after

the

detected

temperature

has

fallen

below

the

reset

temperature

the

main

unit

and

its

right

hand

(

IRTR

)

contact

has

closed

The

reset

level

the

main

unit

continuously

adjustable

from

below

its

operating

temperature

level

The

IRT

relay

mounted

double

end

small

size

drawout

case

The

type

IRT

similar

the

IRT

except

RTD

probe

assembly

furnished

part

the

relay

model

The

probe

three

wire

single

element

tip

sensitive

100

ohm

OOC

platinum

RTD

The

probe

comes

with

fluid

seal

installation

fitting

and

also

brass

reducing

fitting

for

use

where

required

(

see

INSTALLATION

PROCEDURE

)

APPLICATION

The

type

IRT

relays

can

used

protect

any

apparatus

equipped

with

one

the

resistance

temperature

detectors

listed

the

INTRODUCTION

section

The

types

IRT

and

IRT

relays

are

intended

primarily

for

the

protection

motors

generators

having

the

RTD

embedded

the

windings

The

usable

temperature

range

165

makes

them

particularly

suitable

for

application

machines

with

class

insulation

transformers

against

overheating

with

associated

RTD

’

placed

strategic

locations

the

tank

These

relays

may

also

applied

protect

power

Typical

external

connections

for

the

type

IRT

relay

are

shown

Figure

Typical

external

connections

for

the

type

IRT

relay

are

shown

Figure

The

types

IRT

and

IRT

relays

are

intended

primarily

for

bearing

temperature

protection

rotating

equipment

Typical

external

connections

for

these

relays

are

shown

Figure

The

functions

that

temperature

relays

perform

depend

upon

the

type

equipment

protected

its

importance

the

system

and

its

location

the

system

unattended

stations

for

example

the

IRT

relays

operating

from

embedded

RTD

may

used

reduce

remove

load

automatically

The

type

IRT

with

its

normally

open

(

IRT

[

)

and

normally

closed

(

IRTR

)

contacts

could

also

employed

prevent

increase

load

until

the

temperature

has

returned

acceptable

level

attended

stations

the

function

these

relays

generally

provide

warning

alarm

that

overtemperature

condition

exists

especially

the

case

major

units

and

essential

auxiliary

power

equipment

addition

sounding

alarm

the

relays

may

also

initiate

timing

device

which

causes

delayed

automatic

corrective

action

the

station

operator

has

not

responded

the

alarm

within

reasonable

time

These

relays

should

not

used

determine

machine

load

since

operating

temperature

not

necessarily

reliable

indication

maximum

permissible

load

Other

design

limitations

may

place

stringent

restrictions

machine

rating

Courtesy of NationalSwitchgear.com

GEK

86038

TABLE

RELAY

MODEL

DESCRIPTION

TABLE

CVJ

—

LD LD

LO LO

cc cc

—

eg eg

For

use

with

ohm

250

copper

RTD

100

ohm

platinum

RTD

120

ohm

nickel

RTD

furnished

with

relay

Adjustable

overtemperature

range

160

XXX

Adjustable

reset

temperature

below

set

operating

temperature

XXX

Operating

Circuit

120

240

VAC

XXX

Auxi

iary

Circuit

120

240

VAC

125

250

VDC

XXX

Target

Seal

0.2

2.0

amp

XXX

Reset

Features

Manually

Electrically

(

remote

)

Self

XXX

Number

Contacts

Electrically

Separate

Electrically

Separate

Convertible

contact

111 111

Internal

Connections

Figure

Outline

and

Panel

Drilling

Figure

17 17

Operative

Circuit

110

220

VAC

XXX

Auxiliary

Circuit

110

220

VAC

110

220

VDC

XXX

Courtesy of NationalSwitchgear.com

GEK

86038

important

note

that

these

type

IRT

relays

detect

actual

temperature

not

rise

above

ambient

The

temperature

setting

should

made

the

basis

long

term

trends

ambient

temperature

RATINGS

The

operating

unit

the

type

IRT

relays

has

center

tapped

coil

that

permits

operation

either

120

240

volts

For

240

volt

operation

the

two

operating

coils

must

connected

series

For

120

volt

operation

the

two

operating

coils

must

connected

parallel

See

Figures

and

for

the

power

source

connections

The

IRT

and

IRT

models

have

internal

insulated

standoff

post

for

making

the

series

connection

while

the

IRT

and

IRT

models

bring

all

the

operating

coil

leads

separate

terminals

external

the

relay

The

IRT

and

IRT

models

are

shipped

from

the

factory

connected

for

240

volt

operation

Some

models

the

IRT

(

)

relay

are

rated

110

220

VAC

See

Table

The

type

IRT

relays

are

suitable

for

operation

hertz

and

hertz

power

systems

The

type

IRT

relays

are

designed

for

use

with

the

following

specific

type

resistance

temperature

detectors

ohms

copper

RTDs

100

ohms

planinum

RTDs

120

ohm

nickel

RTDs

Use

only

the

specific

RTD

for

which

the

particular

model

IRT

was

designed

The

IRT

and

IRT

relays

are

furnished

with

target

and

seal

unit

having

taps

for

0.2

amps

and

2.0

amps

operation

different

ratings

based

tap

settings

Table

shows

the

TABLE

TARGET

SEAL

UNIT

RATINGS

TAP

0.2

Minimum

operating

current

0.2

2.0

(

ohms

)

(

amps

)

(

seconds

)

(

seconds

)

(

amps

)

resistance

7.0

0.13

Tripping

duty

Carry

amps

Carry

amps

Carry

continuous

Contact

current

closing

rating

(

amps

)

5.0

30.0

0.03

4.0

0.25

30.0

0.3

3.0

(

volts

Max

)

250 250

The

tap

setting

used

the

seal

units

determined

the

current

drawn

the

trip

circuit

The

0.2

amp

tap

for

use

with

trip

circuits

that

operate

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GEK

86038

currents

ranging

from

0.2

2.0

amps

the

minimum

control

voltage

this

tap

used

with

trip

coils

requiring

than

2.0

amps

there

possibility

that

the

7.0

ohms

resistance

the

target

seal

unit

will

reduce

the

current

such

low

value

that

the

breaker

will

not

tripped

The

2.0

amp

tap

should

used

with

trip

coils

that

take

2.0

amps

the

minimum

control

voltage

The

tripping

current

should

not

exceed

amps

the

maximum

control

voltage

the

tripping

current

exceeds

amps

auxiliary

relay

should

used

the

tripping

current

does

not

pass

through

the

target

seal

unit

The

IRT

relay

furnished

with

target

unit

and

auxiliary

telephone

type

relay

The

auxiliary

circuit

may

used

with

120

240

volts

hertz

with

125

250

volts

voltage

level

selection

link

located

inside

the

relay

top

the

resistor

mounting

plate

and

marked

LOW

for

120

and

125

volts

and

HIGH

for

240

and

250

volts

This

link

must

the

position

corresponding

the

voltage

level

being

applied

The

IRT

relay

shipped

from

the

factory

with

the

link

the

HIGH

position

Some

models

the

IRT

(

)

relay

are

rated

110

220

VAC

See

Table

The

target

shows

whenever

overtemperature

condition

first

sensed

must

manually

reset

The

target

not

seal

type

The

auxiliary

telephone

type

relay

contacts

will

and

carry

amps

These

momentarily

for

tripping

duty

control

voltages

250

volts

less

contacts

will

carry

one

amp

continuously

and

have

interrupting

rating

shown

Table

TABLE

AUXILIARY

TELEPHONE

TYPE

RELAY

INTERRUPTING

RATINGS

AMP

INDUCTIVE

AMP

NON

INDUCTIVE

110

0.80

2.1

Vol

(

hertz

)

120

0.75

2.0

220

0.55

1.1

240

0.50

1.0

Volts

1.0

3.0

110

0.5

1.7

125

0.5

1.5

220

0.28

0.78

250

0.25

0.75

The

IRT

furnished

with

target

seal

unit

and

latching

type

auxiliary

telephone

relay

See

TARGET

SEAL

UNIT

RATINGS

Table

;

and

AUXILIARY

TELEPHONE

TYPE

RELAY

INTERRUPTING

RATINGS

Table

The

auxiliary

circuit

will

operate

whenever

overtemperature

condition

The

relay

will

not

permit

the

auxiliary

circuit

reset

until

the

detected

temperature

decreases

below

preselected

temperature

level

and

the

right

hand

(

IRTR

)

contact

has

closed

sensed

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GEK

86038

The

auxiliary

circuit

may

reset

manually

pushing

upward

the

reset

rod

located

the

bottom

left

side

the

cover

may

reset

electrically

from

remote

location

connecting

control

switch

across

terminals

and

the

relay

may

made

self

resetting

shorting

terminals

and

together

either

the

remote

electrical

self

resetting

functions

are

selected

and

the

relay

reset

the

target

will

remain

view

remove

the

target

indication

the

reset

rod

must

pushed

manually

The

IRT

similar

the

IRT

The

difference

between

these

two

models

that

the

IRT

furnished

with

three

wire

single

element

tip

sensitive

100

ohms

platinum

RTD

assembly

The

RTD

assembly

comes

with

special

brass

reducing

fitting

that

will

permit

replacement

existing

General

Electric

temperature

relays

Type

TBB

having

sylphon

bulbs

and

capillaries

with

IRT

See

Figure

RTD

Assembly

BURDENS

Table

shows

the

burdens

for

the

operating

units

the

type

IRT

relays

based

upon

the

type

RTD

for

which

the

unit

designed

TABLE

OPERATING

UNIT

BURDENS

RTD

DESCRIPTION

OHMS

MATERIAL

VOLTS

FREQUENCY

MILLIAMPS

VOLT

AMPS

WATTS

2.61

7.62

63.5

120

copper

2.60

31.7

7.61

240

2.71

8.77

73.1

120

2.71

8.76

36.5

240

2.67

7.80

piatinum

65.4

100

120

2.69

7.87

240

32.8

9.04

2.79

75.3

120

2.80

37.8

9.07

240

2.79

8.17

120

nickel

120

68.1

2.79

240

34.0

8.16

2.91

78.4

9.41

120

9.41

2.91

240

39.2

The

milliamperes

for

the

110

220

volt

operation

are

approximately

the

values

shown

approximately

the

values

shown

Table

The

volt

amperes

and

watts

are

reduced

Table

Tables

and

show

the

burden

data

for

the

auxiliary

circuits

the

IRT

relays

The

IRT

and

IRT

relays

not

have

single

burden

rather

the

burden

changes

the

relay

auxilary

circuit

changes

its

state

from

reset

picked

Tables

and

reflect

the

transitional

and

steady

state

burdens

the

auxiliary

circuits

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GEK

86038

TABLE

BURDEN

FOR

IRT

TARGET

SEAL

UNIT

TAP

OHMS

0.2

7.0

2.0

0.13

TABLE

BURDEN

FOR

IRT

AUXILIARY

CIRCUIT

STATE

PICKED

NOT

PICKED

(

OHMS

)

VOLTS

FREQUENCY

MOMENTARY

CONTINUOUS

110

780

ohms

850

ohms

3530

ohms

3850

ohms

750

ohms

850

ohms

3850

ohms

3850

ohms

infinite

2650

ohms

2900

ohms

5400

ohms

5900

ohms

2550

ohms

2900

ohms

5200

ohms

5900

ohms

120

220

240

110

125

220

250

TABLE

BURDEN

FOR

IRT

AND

IRT

AUXILIARY

CIRCUIT

TARGET

SEAL

UNIT

DURING

VOLTS

FREQ

TRANSITION

STEADY

STATE

TAP

OHMS

110

1830

ohms

infinite

ohms

2000

ohms

infinite

ohms

3700

ohms

infinite

ohms

4000

ohms

infinite

ohms

1760

ohms

infinite

ohms

2000

ohms

infinite

ohms

3520

ohms

infinite

ohms

4000

ohms

infinite

ohms

0.2

7.0

120

2.0

0.13

220

240

125

220

250

CONSTRUCTION

The

relay

case

suitable

for

either

surface

semi

flush

panel

mounting

Hardware

provided

with

the

relay

for

either

mounting

method

The

cover

attaches

the

case

with

four

cover

screws

which

have

provisions

for

sealing

wire

The

cover

also

has

the

reset

mechanism

for

target

reset

the

IRT

and

IRT

this

reset

mechanism

used

manually

reset

the

relay

Care

must

taken

when

removing

replacing

the

cover

the

case

because

the

mechancial

interaction

between

the

reset

mechanism

and

the

individual

internal

components

the

relay

Forcing

the

cover

off

may

damage

the

reset

mechanism

system

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GEK

86038

The

back

the

case

has

studs

mounted

outer

block

These

studs

are

used

for

making

the

external

wiring

connections

the

relay

case

removable

connection

plug

connects

the

outer

block

inner

block

which

connected

the

internal

wiring

the

relay

Both

the

outer

and

inner

blocks

have

spring

backed

contact

fingers

assure

good

electrical

contact

with

the

connection

plug

The

relay

mechanism

mounted

steel

framework

called

cradle

and

complete

unit

with

all

leads

being

terminated

the

inner

block

The

cradle

held

securely

the

case

with

latch

the

top

and

the

bottom

and

guide

the

back

the

case

into

the

case

upside

down

connections

also

locks

the

latch

place

connection

plug

place

The

case

and

cradle

design

prevents

inserting

the

relay

The

connection

plug

besides

making

electrical

The

cover

turn

holds

the

draw

out

the

relay

unit

from

the

case

first

carefully

remove

the

cover

then

the

connection

plugs

Shorting

bars

are

built

into

the

relay

case

short

the

current

transformer

circuits

Release

the

latches

The

relay

unit

may

now

removed

from

the

case

pulling

the

cradle

replace

the

relay

unit

the

reverse

order

Use

care

when

placing

the

cover

back

the

relay

case

avoid

damaging

the

reset

mechanism

RECEIVING

HANDLING

AND

STORAGE

These

relays

when

not

included

part

control

panel

are

shipped

cartons

designed

protect

them

against

damage

relay

examine

for

any

damage

sustained

transit

handling

evident

file

damage

claim

once

with

the

transportation

company

and

promptly

notify

the

nearest

General

Electric

Apparatus

Sales

Office

Exercise

care

when

handling

unpacking

the

relay

avoid

disturbing

adjustments

damaging

the

relay

Immediately

upon

receipt

damage

due

rough

Perform

inspection

and

acceptance

test

soon

the

relay

received

make

sure

that

damage

was

sustained

during

shipment

and

that

the

relay

calibrations

have

not

been

disturbed

the

relays

are

not

installed

immediately

they

should

stored

their

original

cartons

place

that

free

from

moisture

dust

and

metallic

particles

Foreign

matter

collected

the

outside

the

case

may

find

its

way

the

inside

the

case

when

the

cover

removed

creating

the

possiblity

relay

misoperation

INSTALLATION

The

location

should

clean

and

dry

free

from

dust

and

vibration

and

well

lighted

facilitate

inspection

and

testing

The

relay

should

mounted

vertical

surface

drilling

drawings

are

shown

Figures

and

The

outline

and

panel

Courtesy of NationalSwitchgear.com

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