GE TMC21B Manual de usuario

INSTRUCTIONS

GEK

49940

THERMAL

OVERCURRENT

RELAY

TYPES

TMC

GENERAL

ELECTRIC

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GEK

49940

TABLE

CONTENTS

PAGE

DESCRIPTION

APPLICATION

RATINGS

HIGH

SEISMIC

INSTANTANEOUS

UNIT

HIGH

SEISMIC

TARGET

CONTACTS

BURDENS

THERMAL

UNIT

HIGH

SEISMIC

INSTANTANEOUS

UNIT

CHARACTERISTICS

THERMAL

UNIT

HIGH

SEISMIC

INSTANTANEOUS

UNIT

HIGH

SEISMIC

TARGET

CONSTRUCTION

RECEIVING

HANDLING

AND

STORAGE

ACCEPTANCE

TESTS

VISUAL

INSPECTION

TESTING

FACILITIES

POWER

REQUIREMENTS

GENERAL

THERMAL

UNIT

HIGH

SEISMIC

INSTANTANEOUS

UNIT

HIGH

SEISMIC

TARGET

INSTALLATION

PERIODIC

CHECKS

AND

ROUTINE

MAINTENANCE

CONTACT

CLEANING

SYSTEM

TEST

RENEWAL

PARTS

LIST

FIGURES

COVER

(

8043501

)

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GEK

49940

THERMAL

OVERCURRENT

RELAY

TYPES

TMC

AND

TMC

DESCRIPTION

The

TMC

and

TMC

are

single

phase

thermal

overcurrent

relays

designed

for

motor

protection

and

instantaneous

overcurrent

difference

between

the

two

types

relays

follows

They

provide

both

thermal

overload

short

circuit

protection

The

standard

time

curve

Figure

TMC

short

time

curve

Figure

TMC

Each

relay

consists

induction

thermal

unit

with

ambient

temperature

compensation

universal

target

unit

and

instantaneous

overcurrent

unit

with

independent

mechanical

target

The

thermal

and

the

instantaneous

unit

each

have

one

normally

open

contact

instantaneous

unit

contact

self

reset

thermal

unit

contact

are

all

reset

the

same

reset

mechanism

described

detail

the

text

under

the

heading

CONSTRUCTION

The

relay

internal

connections

are

shown

Figure

and

the

outline

and

panel

drilling

dimensions

are

shown

Figure

The

thermal

unit

contact

hand

reset

while

the

The

two

targets

and

the

This

APPLICATION

The

TMC

relays

described

here

are

designed

provide

thermal

overload

and

short

circuit

protection

for

motors

The

relays

are

not

intended

for

use

directly

primary

motor

circuits

They

should

always

applied

with

current

transformers

(

CTs

)

that

they

will

self

protecting

primary

short

circuits

The

CTs

will

saturate

before

excessive

secondary

currents

can

reached

The

relay

thermal

unit

rating

should

selected

that

the

maximum

full

load

motor

current

secondary

basis

falls

between

the

minimum

and

maximum

values

current

shown

the

RELAY

SELECTION

TABLE

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

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

IEEE

and

NEMA

standards

;

but

such

assurance

given

with

respect

local

codes

and

ordinances

because

they

vary

greatly

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GEK

49940

RELAY

SELECTION

TABLE

MOTOR

FULL

LOAD

CURRENT

AMPERES

CURRENT

RATING

AMPERES

MODEL

TMC

MIN

MAX

THERMAL

INST

UNIT

FORM

1.32

1.45

1.64

150

1.46

1.82

1.59

150

1.60

1.75

2.00

150

1.76

1.93

150

2.20

1.94

2.11

2.42

150

2.12

150

2.33 2.65

150

2.34

2.55

2.92

2.81

2.56

3.20

150

2.82

3.09

3.52

150

3.10

3.39

150

3.87

3.40

3.74

150

4.25

4.11

150

3.75

4.68

4.12

5.15

150

4.47

4.48

150

4.97

5.60

The

maximum

full

load

motor

current

determined

the

nameplate

current

multiplied

the

correction

factor

given

the

following

table

depending

upon

the

type

motor

being

used

TEMPERATURE

RATING

MOTOR

CORRECTION

FACTOR

Continuous

1.15

service

factor

Continuous

1.0

service

factor

Short

time

minutes

Short

time

minutes

Short

time

minutes

Short

time

minutes

1.0

0.9

0.8

0.75

0.7

0.6

The

thermal

unit

tripping

current

adjustable

over

the

range

The

relay

calibrated

coil

rating

current

with

110

the

nominal

coil

rating

just

trip

the

motor

full

load

current

(

with

correction

factor

applied

)

near

the

maximum

the

current

selection

range

for

the

chosen

relay

unnecessary

tripping

may

occur

because

the

negative

tolerance

for

the

calibration

current

tolerance

such

unnecessary

tripping

the

thermal

unit

tripping

current

should

increased

The

thermal

unit

should

occur

110

coil

rating

eliminate

the

problem

ambient

temperature

compensation

discussed

under

CHARACTERISTICS

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GEK

49940

The

external

connection

diagram

for

these

relays

shown

Figure

protection

minimum

two

relays

required

for

adequate

motor

shown

RATINGS

The

TMC

relay

rated

for

hertz

The

ratings

thermal

and

instantaneous

units

are

shown

the

RELAY

SELECTION

TABLE

the

preceding

APPLICATION

section

The

TMC

relay

rated

for

hertz

HIGH

SEISMIC

INSTANTANEOUS

UNIT

The

instantaneous

coil

tapped

for

operation

either

one

Selection

the

low

high

range

See

the

Table

lists

the

instantaneous

unit

two

ranges

(

low

high

)

determined

the

connections

made

Terminals

and

internal

connections

Figure

ranges

rating

one

second

rating

etc

TABLE

CONTINUOUS

RATING

(

AMPS

)

HIGH

SEISMIC

INSTANTANEOUS

UNIT

(

AMPS

)

ONE

ftt

SECOND

RATING

(

AMPS

)

RANGE

(

AMPS

)

RANGE

10.2

LOW

000

150

260

19.6

150

HIGH

The

range

approximate

which

means

that

the

150

may

150

one

ampere

overlap

between

the

maximum

low

setting

and

the

minimum

high

setting

higher

range

since

has

the

higher

continuous

rating

There

will

always

least

Whenever

possible

select

the

Higher

currents

may

applied

for

shorter

lengths

time

accordance

with

the

formula

HIGH

SEISMIC

TARGET

Ratings

for

the

target

unit

are

shown

Table

the

tripping

current

exceeds

amperes

auxiliary

relay

should

used

the

connections

being

such

that

the

tripping

current

does

not

pass

through

the

target

coil

the

protective

relay

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GEK

49940

TABLE

TAP

0.2

2.0

RESISTANCE

(

OHMS

)

8.0

0.24

MINIMUM

OPERATING

(

AMPERES

)

0.2

2.0

CARRY

CONTINUOUSLY

(

AMPERES

)

0.3

3.0

CARRY

AMPS

FOR

(

SEC

)

0.03

4.0

CARRY

AMPS

FOR

(

SEC

)

0.25

30.0

IMPEDANCE

(

OHMS

)

68.0

0.73

CONTACTS

The

contacts

will

make

and

carry

amperes

trip

current

and

three

(

)

amperes

continuously

except

limited

the

target

circuit

noted

Table

BURDENS

THERMAL

UNIT

The

burden

the

TMC

rated

current

approximately

13.5

volt

amperes

and

watts

for

hertz

operation

approximately

12.5

volt

amperes

and

watts

for

hertz

operation

the

TMC

approximately

higher

than

the

TMC

type

relay

The

burden

The

volt

ampere

burden

the

TMC

five

amperes

approximately

equal

divided

the

square

the

current

rating

where

325

for

hertz

and

305

for

hertz

The

volt

ampere

burden

the

TMC

five

amperes

approximately

equal

divided

the

square

the

current

rating

where

295

HIGH

SEISMIC

INSTANTANEOUS

UNIT

The

High

Seismic

instantaneous

unit

burdens

are

listed

Table

III

TABLE

III

HIGH

SEISMIC

RANGE

INST

UNIT

(

AMPS

)

BURDENS

MIN

PICKUP

(

OHMS

)

BURDENS

OHMS

(

)

TIMES

PICKUP

MIN

RANGE

(

AMPS

)

PICKUP

(

AMPS

)

LOW

150

0.110

0.078

0.135

0.022

0.005

0.023

0.095

0.081

0.079

0.022

150

HIGH

LOW

150

0.092

0.065

0.112

0.018

0.004

0.019

0.079

0.068

0.066

0.018

150

HIGH

Courtesy of NationalSwitchgear.com

GEK

49940

CHARACTERISTICS

THERMAL

UNIT

The

thermal

unit

consists

current

coil

placed

over

metal

helix

that

acts

the

short

circuited

secondary

transformer

The

current

heats

the

helix

causing

rotate

direction

the

hand

reset

contacts

Tripping

current

adjustable

from

110

coil

rating

The

contacts

cannot

reset

until

the

unit

has

cooled

for

time

The

relay

calibrated

and

has

built

compensation

for

changes

ambient

temperature

;

the

compensation

not

perfect

There

variation

trip

point

per

change

temperature

from

the

calibration

temperature

The

trip

point

will

decrease

the

ambient

temperature

increases

The

resulting

time

the

TMC

relays

should

with

the

time

current

characteristic

curve

shown

Figure

for

the

TMC

and

Figure

for

the

TMC

HIGH

SEISMIC

INSTANTANEOUS

UNIT

The

instantaneous

unit

has

range

with

tapped

coil

There

are

high

and

low

ranges

selected

means

interchanging

two

leads

the

case

block

See

the

internal

Figure

The

time

current

characteristic

curve

for

the

instantaneous

unit

shown

Figure

HIGH

SEISMIC

TARGET

The

target

has

operating

coil

tapped

0.2

and

2.0

amperes

The

relay

shipped

from

the

factory

with

the

tap

screw

the

higher

ampere

position

CONSTRUCTION

The

relay

case

suitable

for

either

surface

semiflush

panel

mounting

and

assortment

hardware

provided

for

either

mounting

The

cover

attaches

the

case

and

also

carries

the

reset

mechanism

screw

connections

the

bottom

only

for

The

electrical

connections

between

the

The

case

has

studs

the

external

connections

relay

units

and

the

case

studs

are

made

through

spring

backed

contact

fingers

mounted

stationary

molded

inner

and

outer

blocks

between

which

nests

removable

connecting

plug

that

completes

the

circuits

The

outer

block

attached

the

case

has

the

studs

for

the

external

connections

and

the

inner

block

has

the

terminals

for

the

internal

connections

The

relay

mechanism

mounted

steel

framework

called

the

cradle

and

complete

unit

with

all

leads

being

terminated

the

inner

block

This

terminal

held

firmly

the

case

with

latch

the

top

and

the

bottom

and

guide

the

back

the

case

The

case

and

cradle

are

constructed

that

the

relay

cannot

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GEK

49940

inserted

the

case

upside

down

making

the

electrical

connections

between

the

respective

blocks

the

cradle

and

case

also

locks

the

latch

place

fastened

the

case

thumbscrews

holds

the

connecting

plug

place

The

connecting

plug

besides

The

cover

which

draw

out

the

relay

unit

the

cover

first

removed

and

the

Shorting

bars

are

provided

the

case

short

the

The

latches

are

then

released

and

the

replace

the

relay

unit

the

plug

drawn

out

current

transformer

circuits

relay

unit

can

easily

drawn

out

reverse

order

followed

separate

testing

plug

can

inserted

place

the

connecting

plug

test

the

relay

place

the

panel

either

from

its

own

source

current

from

other

sources

the

relay

unit

can

drawn

out

and

replaced

another

that

has

been

tested

the

laboratory

The

target

mounted

the

front

top

left

and

consists

small

hinged

type

unit

that

raises

target

when

picked

target

released

raising

rod

located

the

lower

left

corner

the

relay

cover

The

addition

the

target

there

hinged

type

instantaneous

unit

mounted

the

front

top

right

picks

raises

target

that

latches

and

remains

exposed

until

The

same

reset

rod

that

releases

the

left

target

also

releases

the

instantaneous

unit

target

When

the

instantaneous

unit

released

RECEIVING

HANDLING

AND

STORAGE

These

relays

when

not

included

part

control

panel

will

shipped

cartons

designed

protect

them

against

damage

Immediately

upon

receipt

relay

examine

for

any

damage

sustained

transit

handling

evident

transportation

company

Electric

Sales

Office

injury

damage

resulting

from

rough

damage

claim

once

with

the

nearest

General

file

and

promptly

notify

the

Reasonable

care

should

exercised

unpacking

the

relay

order

that

none

the

parts

are

injured

nor

the

adjustments

disturbed

the

relays

are

not

installed

immediately

they

should

stored

their

original

cartons

place

that

free

from

moisture

dust

and

metallic

chips

outside

the

case

may

find

its

way

inside

when

the

cover

and

cause

trouble

the

operation

the

relay

Foreign

matter

collected

the

removed

ACCEPTANCE

TESTS

Immediately

upon

receipt

the

relay

inspection

and

acceptance

test

should

made

make

sure

that

damage

has

been

sustained

shipment

and

that

the

relay

calibrations

have

not

been

Courtesy of NationalSwitchgear.com

GEK

49940

the

examination

test

indicates

that

readjustment

refer

the

section

SERVICING

disturbed

necessary

These

tests

may

performed

part

the

installation

the

acceptance

tests

the

discretion

the

user

Since

most

operating

companies

use

different

procedures

for

acceptance

and

for

installation

tests

the

following

section

includes

all

applicable

tests

that

may

performed

these

relays

VISUAL

INSPECTION

Check

the

nameplate

make

sure

that

the

model

number

and

rating

the

relay

agree

with

the

requisition

Remove

the

relay

from

its

case

and

check

that

there

are

broken

cracked

parts

any

other

signs

physical

damage

TESTING

FACILITIES

All

General

Electric

drawout

case

relays

may

easily

tested

the

case

using

either

the

XLA

test

plugs

has

fingers

which

bring

both

the

ten

relay

connections

and

the

ten

outside

world

connections

the

front

the

relay

for

easy

access

the

front

the

relay

without

disturbing

the

shorting

bars

The

XLA

The

XLA

test

plug

brings

only

the

ten

relay

connections

For

further

information

these

test

plugs

refer

Section

7332

the

General

Electric

Apparatus

Handbook

contact

the

nearest

General

Electric

Sales

Office

POWER

REQUIREMENTS

GENERAL

All

devices

operating

alternating

current

(

)

are

affected

Since

non

sinusoidal

waveforms

can

analyzed

frequency

fundamental

frequency

plus

harmonics

that

fundamental

frequency

follows

that

alternating

current

devices

(

relays

)

will

affected

applied

waveforms

significantly

affected

the

application

waveforms

relays

(

and

devices

general

)

are

non

sinusoidal

Therefore

order

test

relays

properly

essential

use

test

voltage

and

current

waveform

that

sinusoidal

purity

the

sine

wave

(

its

freedom

from

harmonics

)

cannot

expressed

finite

number

for

any

particular

relay

;

however

any

relay

using

tuned

circuits

networks

saturating

electromagnets

(

such

time

overcurrent

relays

)

would

especially

affected

non

sinusoidal

wave

forms

The

THERMAL

UNIT

advisable

not

The

relay

has

been

adjusted

the

factory

;

disturb

the

adjustments

helix

and

the

compensating

metal

should

never

tampered

with

any

time

most

important

that

the

metal

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GEK

49940

Upon

leaving

the

factory

the

relay

set

for

the

100

desired

adjust

the

relay

trip

slightly

higher

lower

value

current

loosen

the

adjustment

locking

screw

(

see

Figure

)

Then

the

adjusting

screw

can

turned

provide

the

desired

adjustment

locking

screw

calibration

sure

tighten

the

Tests

the

thermal

unit

should

made

with

the

cover

order

prevent

some

pre

heating

the

unit

(

such

would

occur

while

adjusting

the

current

the

test

circuit

the

desired

level

with

the

thermal

unit

the

circuit

)

bypass

rather

than

shorting

out

the

thermal

unit

during

the

current

setting

When

the

thermal

unit

included

the

circuit

the

magnitude

current

will

somewhat

less

but

its

value

can

determined

during

the

timing

period

check

the

level

percentage

overload

The

resulting

time

should

within

the

published

time

curves

HIGH

SEISMIC

INSTANTANEOUS

UNIT

Make

sure

that

the

instantaneous

unit

wired

for

the

range

See

Figure

range

which

operate

higher

range

since

the

higher

rating

Whenever

possible

use

the

has

the

higher

continuous

The

instantaneous

unit

has

adjustable

core

located

the

top

the

unit

shown

Figure

set

the

instantaneous

unit

desired

pickup

loosen

the

locknut

and

adjust

the

core

the

core

clockwise

decreases

the

counterclockwise

increases

the

pickup

until

the

operation

desired

pickup

value

reached

Turning

pickup

;

turning

the

core

Bring

the

current

slowly

may

necessary

repeat

this

Once

the

unit

picks

until

the

desired

pickup

value

obtained

tighten

the

locknut

CAUTION

Refer

Table

for

the

continuous

and

one

second

ratings

the

instantaneous

unit

applying

current

the

instantaneous

unit

not

exceed

these

ratings

when

The

range

the

instantaneous

unit

must

obtained

between

core

position

turn

full

clockwise

and

turns

counterclockwise

from

the

full

clockwise

position

HIGH

SEISMIC

TARGET

The

pickup

and

dropout

current

listed

Table

TABLE

PICK

CURRENT

DROPOUT

CURRENT

TAP

0.2

0.12

0.19

1.2

1.9

0.05

0.50

2.0

Courtesy of NationalSwitchgear.com

Este manual sirve para los siguientes modelos

Tabla de contenidos

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Kemo Electronic

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Kyongbo Electronics

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Siemens

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Littelfuse

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EVA Logik

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