GE NGV Series Manuale utente

INSTRUCTIONS

A-C

UNDERVOLTAGE

RELAY

TYPE

NGV

MODEL

12NGV28B(-)A

EK-45498

INSERT

BOOKLET-GEI-90805

INTRODUCTION

These

instructions

plus

those

included

GEI-90805

form

the

instructions

for

this

relay.

DESCRIPTION

Relay

model

NGV28B(-)A

similar

wired to

studs

15-16

case.

circuits

brought

out

separate

model

NGV13B(-)A

except

This

allows

the

wiring

case

and

cradle

blocks.

the

coil

circuit

coil

and

contact

The

table

below

lists

the

ratings

presently

available

the

NGV28B(—)A

relay:

NGV28B(-)A

VOLTS

FREQUENCY

DROPOUT

VOLTS

FORM

CONT.

(HERTZ)

CALIBRATION

RANGE

120

60 70

100

relay.

Figure

this

supplement

the

internal

connections

diagram

for

this

for

the

Figure

case.

this

suplenient

gives

the

outline

and

panel

drilling

dimensions

POWER

SYSTEMS

MANAGEMENT

DEPARTMENT

GENERALS

ELECTRIC

PNILAIELPRIA.

PA.

7iesc

instructions

not

purport

cover

all

details

variations

equipment

nor

provide

for

pussibJ

ciintinqoncq

met

connection

with

installation,

operation

or maintenance.

Should

ljrthor

nftcnation

desired

should

particular

proh.lems

arise

which

are

not

covered

sufficiently

for

the

purcr.laer’s

purposes,

the

matter

should

rvferred

the

General

Electric

Coyrany.

the

extant required

the

product.s

described

herein

meet

applicable

ANSI,

lEE’S

and

N74A

standards;

hit

sueS

assurance

given

with

r.pcct

local

codes

and

ordinances

because they

vary

greatly.

v*v*

GEK-45498

‘5

FIG.

(269A3034-

)

INTERNAL CONNECTIONS

DIAGRAM FOR

THE

NGV28B(-)A

RELAY.

FORM

(OHMS) (OHMS)

(OHMS)

Mfd

1.3K

.05

SHORT

FINGER

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-I1-

Power

Management

215

Anderson

Avenue

Markham,

Ontario

Canada

L6E

1B3

Tel: (905)

294-6222

Fax:

(905)

201-2098

wwwge.comlindsyslpm

I-90805J

INSTRUCTIONS

NGV11A

NGV11B

HGV12A

NGV12B

NGV12C

NGV13A

NGV13B

Forms

and

UNDERVOLTAGE

RELAYS

TYPES

Meter

and

Control

205

Great

Valley

Parkway

Malvern,

19355-07

GEI-90805

CONNFCTING

PLUG

MAIN

BRUSH

CONNECTING

BLOCK

AUXILIARY

BRUSH

TERMINAL

BLOCK

SHORTING

BAR

NUlL

ENGAGING

AUXILIARY

BRUSH

CONNECTING

PLUG

TRAVELS

1/4

INCH

BEFORE

ENGAGING

THE

MAIN

BRUSH ON

THE

TERMINAL

BLOCK

Figure

(8025039)

Cross

Section

Drawout

Case

Showing

Position

Auxiliary

Brush

.FRAME

OPERATING

ARM

\ARMATURE

RESIDUAL

SCREW

LOCKNUT

HEELEND OPERATINGARMSTOP

COIL

—POLEPIECE

Figure

(8012106)

Typical

Telephone

Type

Unit

Used

NGV

Relays

TAG

1-90805

UNDERVOLTAGE

RELAYS

TYPE

NGV

DESCRIPTION

The

NGV

relay

high-speed

relay

designed

used

wherever

undervoltage

protection

required.

The

relay

designed

operate continuously

picked

its

rated

voltage

required.

The

different

models

available

are

listed

Table

TABLE

NGV

RELAY MODELS

No.

of Units

No.

Type

Relay

Case

Targets

Case

NGV11A

0 S2

NGV11B

NGV12A

0 S2

NGVI2B

NGV1?C

NGV13A

NGV13B

The

relay

undervoltage

element

consists

telephone-type

relay

series

with

zener

regulator

connected

across

full

wave

rectifier.

capacitor

connected

across

the

rectifier

supply

protect

the

rectifier

from

severe

voltage

surges.

rheostat

connected

series

with

the

rectifier

provide

pickup

adjustment. Targets

mounted

the

drawout

case

are

available

indicated

Table

The

outline

and

drilling

dimensions

the

relay

are

depicted

Figures

and

11.

APPLICATION

The

NGV

relay

intended

for

general

application

wherever

instantaneous

detection

undervoltage

required.

Some

specific

applications

are

listed

below:

Instantaneous

undervoltage

detection for

preferred—emergency

throwover

control

equipment.

Ground

fault

detection

for

faulted—phase

selection

ungrounded

systems.

Phase

fault

detection

for

disabling

telephone

telemetering

services

stations

with

weak

backfeed

carrier

channels

used

for

relaying.

These

Instructions

not

purport

cover

all

details

variations

equipxnt

nor

provide

for

,v’r

possible

contingency

nc.t

connection

with

installation,

operation

zrintenance.

Should

srrer

r.formtAon

desired

should

particu1ar

prnhlezr

arise

ahich

are

not

covered

sufficiently

for

the purshasr-r

‘s

purposes,

the

rter

shoal

referred

the

General

electric

Coany.

the

extCnt

rsqu2

red

thc

produrts

descrhed

herein

neet

applicable

ANSI,

IFtE

and

NEMA

standards;

nut

suc

assurance

gIven

vth

respect

to lot-al

codes

and

ordinances

because

they

vary

greatly.

GEI-90805

RATINGS

The

NGV

relay

potential

units

available

are

rated

240

volts,

50/60

cyc

Cs.

The

contacts

will

make

and

carry

amperes

for

tripping

duty.

The

interrupting

capabilities

for

each

contact

for

repetitive

protective

duty

are

given

Table

The

target

units

are

current

operated

and

have

minimum

operating

rating

0.2

amperes

2.0

amperes.

The

contacts

which

are

not

series

with

target

coils

will

carry

three

amperes

continuously.

TABLE

CONTACT

INTERRUPTING

ABILITY

Interruption

Capabilit

Volts

(Amps)

Inductive**

1.0

125

0.5

250

0.25

115

cycles

0.75

230

cycles

0.5

**Inductance

average

trip

coil.

The

non—inductive

ratings

for

repetitive

protective

duty

are

approxi

mately

2-1/2

times

ratings

shown

the

table.

CHARACTERISTICS

The

NGV

voltage

unit

hinged

armature

unit

which

drops

out

when

the

magnetic

pull

created

the

ampere—turns

the

operating

coil

less

than

the

force

the

opening

spring.

The

drop-out

voltage

changed

adjusting

the

rheostat

and

the

voltage

range

given

Table

TABLE

VOLTAGE

RANGE

Rated

Volts

Range

Dropout

Adjustment

40-

120

100

208

121

173

240

140

200

GUI-

90805

The

pickup

voltage

110

percent

less

the dropout

voltage.

any

drop

out

operation,

the

voltage

range

from

the

beginning

of the

action

its

completion

about

one

percent

rated

voltage.

The

relay

pickup time

approximately

two

cycles

and

the

dropout

characteristic

(voltage

against

time)

shown

Figure

The

burden

the

voltage

unit

unity

power

factor

and

the

values

are

given

Table

TABLE

BURDENS

Rated

Voltage

aximum

Burden, Watts

120

4.2

208

4.75

240

4.5

The

target

unit

coil

has

resistance

7.5

ohms

for

the

0.2

ampere

unit

and

0.12

ohms

for

the

ampere

unit.

Internal

connections

the

various

relays

are

shown

Figures

through

and

12.

CONSTRUCTION

The

relay

components

are

mounted

cradle

assembly

which

latched

into

drawout case

when

the

relay

operation,

but

that

can

easily

removed

when

desired.

remove

the

relay

from

its

case,

first

disconnect

removing

the

connection

plug

that

completes

the

electrical

connections

between

the

case

block

and

the

cradle

block.

This

connection

block

can

replaced

test

plug to

test

the

relay

its

case.

The

cover,

which

attached

the

front

the

relay

case,

contains

the

target

reset

mechanism

and

interlock

arm

which

prevents

the

cover

from

being

replaced

until

the connection

plugs

have been

inserted.

The

relay

case

suitable

for

either

semi-flush

surface

mounting

all

panels

two

inches

thick;

appropriate

hardware

available.

However,

insure

that

proper

hardware

will

included,

panel

thickness

must

indicated

the

relay

order.

For

outline

and

drilling

dimensions,

see

Figures

and

11.

Every

circuit

the

drawout

case

has

auxiliary

brush,

shown

Figure

provide

adequate

overlap

when

the

connecting

plug

withdrawn

inserted.

Some

circuits

are

equipped

with

shorting

bars

(see

Figures

3-8)

and

these

circuits,

especially

important

that

the

auxiliary

brush

makes

contact

with

adequate

pressure

indicated

Figure

to prevent

the

opening

interlock

circuits.

1-90805

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.

damage

resulting

from

rough

handling

evident,

file

damage

claim

once

with

thc

transportation

company

and

promptly

notify

the

nearest

General

Electric

Apparatus

Sales

Office.

Use

reasonable

care

when

unpacking

the

relays.

the

relays

are

not

installed

immediately,

store

them

their

shipping

cartons

place

that

free

from

moisture, dust

and

metallic

chips.

Foreign

matter

that

has

collected

the

outside

the

case

could

get

inside

when

the

cover

removed

and

cause

problems

the

operation

the

relay.

Also

check

the

nameplate

stamping

insure

that

the

model

number

and

the

rating

the

relay

received

agree

with

the

requisition.

Check

the

operation

manually,

and

check

that

the

contact

gap

and

wipe

agree

with

values

given

the

section

ADJUSTMENTS

AND

INSPECTION.

ADJUSTMENT

AND

INSPECT

ION

MECHANICAL

CHECK

Check

the

relay

for

mechanical

operation

before

installation

see

that

operates

smoothly

and

that

the

contacts

are

correctly

adjusted.

With

the

relay

de-energized,

each

normally

open

contact

should

have

gap

0.015

inch

more.

Observe

the

wipe

each

normally

closed

contacL

deflecting

the

stationary

contact

member

towards

the

frame.

Wipe

should

approximately

0.005

inch.

The

wipe

each

normally

open

contact

should

approximately

0.005

inch.

Check

inserting

0.005

inch

shim

between

the

residual

screw

and

the

pole

piece

and

operating

the

armature

hand.

The

normally

open

contacts

should

make

before

the

residual

screw

strikes

the

shim.

ELECTRICAL TEST

The

relay

should

tested

before

installation

and

periodically

thereafter

connecting

variable

source

voltage

rated

frequency

to the

coil

studs

and

checking

the

pickup

and

dropout

voltages.

Use

the

variable

rheostat

to the

relay,

and

necessary,

the

residual

screw

adjust

the

values

required.

Adjustment

the

ratio

pickup

dropout

made,

necessary,

with

the

residual

screw;

most

applications

adjustment

this

ratio

will

required.

variable

source

power

should

connected

to the

target

circuits,

furnished,

and

the

pickup

amperes

checked.

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