GE NGV29A Manuale utente

Instructions

GK-49896C

SENSITIVE

GROUND

RELAY

(Formerly

0178AS900)

TYPE

NGV29A

These

instructions

not

purport

cover

all

details

variations

equipment

nor

provide

for

every

possible

contingency

met

connection

with installation,

ope,tion

maintenance

Should

further

information

desi,d

should

part

icular

problems

arise

which

not

covecd

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

NEMA

standards; but

such

assurance

given with

respect

local

codes

and

ordinances

because

they

veiy

greatly.

CEK—49896

CONTENTS

Description

Application

Ratings

Operating

Principles

Characteristics

Burden

Construction

Receiving.

Handling

and

Storage

Electrical

Tests

Drawout

Relays,

Ceneral

Power

Requirements,

Ceneral

Acceptance

Tests

Seal—in

Circuit

Test

Periodic

Checks

and

Routine

Maintenance

Contact

Cleaning

Servicing

Renewal

Parts

CEK-49896

SENSITIVE

GROUND

RELAY

TYPE

NGV29A

(Formerly

0178A8900)

DESCRIPTION

The

Type

NOV

relay

covered

these

instructions

sensitive

relay

for

ground

detection.

consists

two

telephone—type

relays,

and

sensitive

polarized

relay,

with

associated

diodes

and

resistors,

mounted

size

single—end

drawout

case.

APPLICATION

The

12NGV29A(—)A

relay,

designed

provide

sensitive

ground

protection

for

buses.

Typical

external

connections

for

such

application

are

shown

Figure

The

relay

will

indicate

whether the

ground

the

positive

negative

bus,

depending

upon

which

the

polarized unit contacts

close.

Ground

sensitivity

for

the

available

voltage

ratings

listed

in the

section

CRARACTERISTICS.

RATINGS

The

Model

12NGVZ9A(—)A

relay

available

four

voltage

ratings:

24,

48,

125

250

VDC.

The

relays

are

continuously

rated

these

voltages.

The

and

telephone

relay

contacts

are

continuously

rated

amperes

and

are

capable

momentarily

carrying

amperes

250

VDC

for

tripping

duty,

but

should

interrupted

some

other

suitable

means

the

interrupting

capability

shown

Table

exceeded.

TABLE

CONTACT

INTERRUPTING

ABILITY

Volts

Interruption

Capability

(Amps)

Inductive**

24DC

1.0

48DC

1.0

125DC

0.5

250DC

0.25

Inductance

average

trip

coil.

The

non—inductive

interrupting

ratings

for

repetitive

protective

duty

are approximately

1/2

times

the

ratings

shown

the

table.

OPERATING

PRINCIPLES

The

Model

12NGV29A(—)A

relay

consists

two

telephone

relays,

sensitive

polarized

relay

and

two

diode

boards

contained

single—ended

drawout

case.

typical

telephone

relay

shown

Figure

The

sensitive

relay

will

detect

current

leakage

ground

from

either

the

(+)

the

(—)

bus

and

operate

its

contact,

which

will

energize

either

the

cgK

-49896

relay,

depending

the

direction

ground—car’-ent

flow.

The

unit

pickup

indicates

(—)

DC—to—ground

leakage,

and

the

unit

pickup

will

indicate

(÷)

DC-

to—ground

leakage.

either

case the

output

wiLl

contact

sound

alarm

trip

breaker.

CHARACTERISTICS

The

Model

I2NGV29A(—)A

relay

consists

sensitive

relay

for

use

ground—

current

detector.

The

two

telephone

relays

and

are

the

output

relays,

and

when

energized

will

contact

that

can

used

for

tripping

alarm.

seal—

circuit

available

connecting

studs

and

stud

desired.

The

relay

has

maximum

resistance—to—ground

sensitivity

listed

below.

Voltage Rating

Naximum

Resistance—to—Ground

Sensitivity

(Ohms)

1.25

125

250

BURD€N

The

burden

imposed

the

relay

the

bus

under

normal

conditions

will

the

current

drawn

and

series,

divided

into

the

voltage.

Refer

the

chart

out

the

internal

connection

diagram

Figure

for

the

resistor

and

component

resistance

values.

CONSTRUCTION

The

relay

components

are

mounted

cradle

assembly

that

latched

into

drawout

case

when

the

relay

operation

but

can

easily

removed

when

desired.

this,

the

relay

first

disconnected

removing

the

connection

plug

that

completes

the

electrical

connections

between

the case

block

and

the

cradle

block.

test

the

relay

its

case,

this

connection

block

can

replaced

test

plug.

The

relay

case

suitable

for

either

semi—flush

surface

mounting

all

panels

two

(2)

inches

thick,

and

appropriate

hardware

available.

However,

panel

thickness

must

indicated

the

relay

order

sure

that

proper

hardware

will

included.

For

outline

arid

drilling

dimensions,

see

Figure

Every

circuit

the

drawout

case

has

auxiliary

brush,

shown

Figure

provide

adequate

overlap

when

the

connecting

plug

withdrawn

inserted.

For

the

electrical

circuits

and

the

external—connection

diagrams

see

Figures

and

RECEIVING,

HANDLING

AND

STORAGE

These

relays,

when

not

included

part

control

panel,

will

shipped in

cartons

designed

protect

them

against

damage.

Immediately

upon

receipt

relay,

examine

for

any

damage

sustained

transit.

injury

damage

resulting

from

rough

handling

evident,

fle

damage

claim

once

with

the

transportation

company

and

promptly

notify

the

nearest

General

Electric

Sales

Office.

CEK-49896

Reasonable

care

should

exercised

unpacking

the

relay

order

that

none

the

parts

irjurcd

nor

adjustments

disturbed.

the

relays

are

not

installed

itmuediately,

they

should

stored

their

original

cartons

place

that

free

from

moisture,

dust

and

metallic

chips.

Foreign

matter

collected

the

outside

the

case

may

find

its

way

inside

when

the

cover

removed,

and

cause

trouble

the

operation

the

relay.

ELECTRICAL

TESTS

DRAWOUT

RELAYS,

GENERAL

Since

all

drawout

relays

service

operate

their

cases,

recommended

that

they

tested

their

cases

equivalent

steel

case.

this

way

any

magnetic

effects

the

enclosure

will.

accurately

duplicated

during

testing.

relay

may

tested

without

removing

from

the

panel

using

12XLA13A

test

plug.

This

plug

makes

connections

only

with

the

relay.

course,

the

12XLAl2A

test

plug

may

also

used.

Although

this

test

plug

allows

greater

testing

flexibility,

also

requires

the

exercise

greater

care,

since

connections

are

made

both

the

relay

and

the

external

circuitry.

POWER

REQUIREMENTS,

GENERAL

Relays

requiring

control

power

should

tested

using

and

not

full—wave

rectified

power.

Unless

the

rectified

supply

well

filtered,

many

relays

will

not

operate

properly,

due

the

dips

the

rectified

power. Zener

diodes, for

example,

can

turn

off

during

these

dips.

general

rule,

the

source

should

not

contain

than

ripple.

ACCEPTANCE

TESTS

Apply

60%

rated

voltage

(see

Table

Ifl

studs

5(+)

and

6(—).

Connect

test

resistor

across

studs

and

the

left

telephone

relay

should

pick

up.

Connect

test

resistor

across

studs

and

the

right

telephone

relay

should

pick

up.

TABLE

Rated

Bus

Voltage

60%

Rated

Bus

Voltage

Test

Resistor

Ohms

VDC

14.4

VDC

500K

VDC

28.8

VDC

125

VOC

VDC

250

VOC

140

VDC

10K

Note

that

the

relay

will

drop

out

whenever

the

test

resistor

removed from

the

studs

mentioned

above.

SEAL—IN

CIRCUIT

TEST

Short

studs

and

stud

and

repeat

the

above

tests,

and

note

that

the

relay

does

not

drop

out

when

the

test

resistor

removed

from

the

studs

mentioned.

order

drop

out

the

supply

voltage

must

be removed.

For

accurate

test

the

relay,

refer

the

section

SERVICING.

GEK

-4

PERIODIC

CHECKS

AND

ROUTINE

MAINTENANCE

view

the

vital

role

protective

relays

the

operation

power

system,

important

that

periodic

test

program

followed.

recognized

that

the

interval

between

periodic

checks

will

vary

depending

upon

environment,

type of

relay

and

the

user’s

experience

with

periodic

testing.

Until

the

user

has

accumulated

enough

experience

select

the

test

interval

best

suited

his

individual

requirements,

suggested

that

the

points

listed

under

ELECTRICAL

TESTS

and

ACCEPTANCE

TESTS

checked

interval

from

one

two

years.

CONTACT

CLEANING

For

cleaning

relay

contacts,

flexible

burnishing

tool

should

used.

This

consists

flexible

strip

metal

with

etched—roughened

surface,

resembling

effect

superfine

file.

The

polishing

action

delicate

that

rio

scratches

are

left,

yet

will

clean

off

any

corrosion

thoroughly

and

rapidly.

The

flexibility

the

tool ensures

the

cleaning

of the

actual

points

contact.

not

use

knives,

files,

abrasive

paper

cloth

any

kind

clean

relay

contacts.

SERVICING

Connect

adjustable

rheostat

the

value

listed

Table

III

stud

and

stud

with

the

rheostat

set

for

maximum

ohms.

Apply

rated voltage

studs

5(+)

and

6(-);

neither

the

nor

the

relay

should

operate.

Reduce

the

resistance

of the

rheostat

until

the

left

“L”

relay

picks

up.

This

should occur

listed

below

under

“Sensitivity”

Table

III.

(Measure

the

resistance

remaining

the

rheostat.)

Put

the

rheostat

(set

maximum

resistance)

studs

and

reduce

the

resistance;

the

right

CR)

relay

should

pick

up.

Measure

the

resistance

of the

rheostat;

this

should

between

the

values

listed

Table

III.

TABLE

III

Maximum

Test Rheostat

Sensitivity

for

Rated

Bus

Voltage

Resistance

Ground

Ohms

Telephone

Relay

Operate

Pickup

24VDC

1.25K 5K

1.75—

VDC

125

VDC

—

250

VDC

—

RENEWAL

PARTS

Sufficient

quantities

renewal

parts

should

kept

stock

for

the

prompt

replacement

any

that

are

worn,

broken

damaged.

When

ordering

renewal

parts,

address

the

nearest

Sales

Office

the

General

Electric

Company.

Specify

the

name

the

part

wanted,

quantity required,

and

complete

nameplate

data,

including

the

serial

number,

the

relay.

R2—

GEK—4

9896

Figure

(8043268)

NGV29A

Relay.

Front

View,

Out

Case

GEK—4

9896

TERM

INAL

Figure

(8043269)

‘DIODE

8OARD

-——TERM1NAL

NCV29A

Relay,

Rear

View,

Out

Case

CEK—49896

FRMF

OFERTING

ARMTLIRE

SCFEw

L__

LOCKNJT

POLE

FoE

Figure

(8012106)

Typical

Telephone

Relay

Used

in the

NGV29A

Relay

LEND

SOiL

OPERAT:

tO,

STCP

-49896

9,125

232MM

ASS

125

29MM

PANEL

LOCATION

SEMI—FLUSH

STUB

NUMBER

97531

00000

862

BACK

VIEf

281

cccJ

468

37MM

-500

12MM

(TY

CAL)

PANEL

]JRILLN1

FOR

SURFACE

MDUN

ING

FRONT

VIEW

TYPICAL

DIM.

INCHES

____

3.0

76Mh

‘

VIEW

SHOWING

ASSEMBLY

OF HARDWARE

FOR

SURFACE

MTG.

STEEL PANFLS

Figure

(K-6209271

[81)

Outline

and

Panel-Drilling

for the

0178A8900

Relay

_____

625

_____

168MM

•

-C

(2)

5/16—18

STUDS

FOR

SURFACE

MTG.

375

212MM

10—32

3/8

MTG.

SCREWS

0—32

STUBS

1/4

DRILL

HOLES

6MM

157MM

5/8

DRILL

HOLES

--i--

CUTIJUT

111MM

CUTOUT

MAY

REPLACE

DRILLE!)

HOLES

156

29MM

218

5MM

843

72MM

687

4MM

PANEL

DRILLING

FOR

SEMI-FLUSH

MOUNTING

FRONT

VIEW

•3/4

DR.LL

HOLES

19MM

5/1618

STUD

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