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IS 1885-74 (2012): Electrotechnical Vocabulary, Part 74:Electrical and magnetic devices [ETD 1: BasicElectrotechnical Standards]

Muy 1993

IS 1885 ( Part 74 ) : 1993 IEC Pub 50 ( 151) ( 1978 )

vTciY9 W;TT

Indian Standard

ELECTROTECHNICALVOCABULARY PART 74 ELECTRICAL AND MAGNETIC DEVICES

Q BIS 1993

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARC

NEW DELHI 110002

Price Group 7

Basic Electrotechnical Standards Sectional Committee, ET 01

NATIONAL FOREWORD

This Indian Standard ( Part 74 ) which is identical with IEC Pub 50 ( 151 ) ( 1978 ) International electrotechnical vocabulary - Chapter 151 : Electrical and Magnetic devices, issued by the Inter- national Electrotechnical Commission ( IEC ), was adopted by the Bureau of Indian Standards on the recommendation of the Basic Electrotechnical Standards Sectional Committee and approval of the Electrotechnical Division Council.

Only the English text given in the IEC publication has been retained while adopting as Indian Standard, and as such the page numbers given here are not same as in IEC Publication,

IS 1885 (Part 74) : 1993 IEC Pub 50 (151) (1978)

Indian Standard

ELECTROTECHNICALVOCABULARY

PART 74 ELECTRICAL AND MAGNETIC DEVICES

SECTION 151-Ol- GENERAL

151-01-01

electrical device

Notr. - A device may be considered as a component of a larger assembly.

151-01-02

conductor

A compdnent intended to carry electric conduction current.

151-01-03

terminal (as a component)

A component provided for the connection of a device to external conductors.

151-01-04

electrode

A conducting part intended as a conducting interface with a medium of different conductivity.

Note. - Between two electrodes of a device, there is normally a potential difference and there may be a current.

151-01-05

anode (of a device)

An electrode through which current normally enters the medium of different conductivity.

151-01-06

cathode (of a device)

An electrode through which current normally leaves the medium of different conductivity.

151-01-07

earth

ground (except UK)

The conducting mass of the Earth, whose electric potential at any point is conventionally taken as zero.

1

151-01-08

earth (ing-conductor)

A conductor of low impedance comlected to Earth.

151-01-09

chassis; frame

A conductive body whose potential is taken as reference.

151-01-10

insulator

A component designed to support and insulate a conductive body.

151-01-11

(insulating) hushing

An insulator used to form a passage for a conductor through a non-insulating partition.

151-01-12

capacitor-bushing

condenser bushing (deprecated)

A bushing in which a desired voltage grading is obtained by an arrangement of capacitors.

151-01-13

screen

shield (USA) (deprecated in UK in this sense)

A device used to reduce the penetration of a field into an assigned region.

151-01-14

electric screen

A screen of conductive material intended to reduce the penetration of an electric field into an assigned region.

151-01-15

magnetic screen

A icreen of ferromagnetic material intended to reduce the penetration of a magnetic field into an assigned region.

1s 1885 (Im-t 74) : 1993 IE

151-01-3s

capacitor

A dcvicc used because of its capacitance.

151-01-36

blocking capacitor

A capacitor mainly used to prevent the flow of the direct conrl~onent of a pulsating current.

Ml-01 -37

A device intended to havr an external niagnetic field.

151-01-38

permanent magnet

A magnet which requires no current to maintain its field.

151-Ol-3Y

electt-olllagllrt

A niagnct which requires current to niaintain its field.

151-01-40

poles of a magnet

The l)arts of a niagnet front which the useful external magnetic flux enters or leaves the magnet.

151-01-41

keeper

A high-pcrnieance piccr of niagnetic niaterial placed ilCM)SS tllr poles Of a pernianent lnagnet to protecl it Irorll unintc~lti~~~~~l demagnetization or to reduce its external field.

151-01-42

(electrical) relay

A device designed to product sudden predeterniined changes in one or niorc elcclrical output circuits, after the appearance of certain conditions in the electrical input circuits controlling the device.

151-01-43

(electric) shunt

A conducting device connected in parallel with part of a current carrying electric circuit to divert current from that part.

151-01-44

magnetic shunt

A device of niagnetic nlalcri;lI which is placed in yar~llcl with part of a n~agnetic circuit to divert flux front that part.

IS 1885 (Part 74) : lYY3 IEC Pub 50 (151) (lY78)

151-01-45

A device for closing or opening one or inore electric circuits. *

151-01-46

change-over switch; selector switch

A device for changing the connections of one or nlorc electric circuits.

151-01-47

reversing switch

A device for changing the direction of a current in part of ill1 electric circuit.

151-01-4X

spark-gap

A device with two or niore electrodes designed for sparkover to occur under specified conditions.

151-01-49

electric eoergy transducer

Adeviceforronvertingortransferringenergy, inwhich at least one of the forms of energy is electrical.

151-01-50

electric signal transducer

A device for converting or transferring signals and in which at least one of the forms of signals is electrical.

151-01-51

electric machine

An electric energy transducer that converts electric energy into nlechanical energy or vice versa.

151-01-52

(electric) gener;ltor

An elcctrir niachine that converts mechanical energy into electric energy.

151-01-53

(electric) motor

An electric niachine lhat converts electric energy into niechanical energy.

151-01-54

transformer

A static cletric energy transducer that transfers electric enegry without change of frequency.

IS 1885 (Part 74) : 1993 IEC Pub 50 (151) (1978)

151-01-55

frequency convertor

frequency changer (USA)

An electric energy transducer that transfers electric energy with change of frequency.

151-01-56

less [greater] than a specified value.

151-01-66

phase convertor

An electric enegry transducer that transfers electric enegry with change of nuniber of phases.

151-01-57

rectifier

cut-otffrequency

A frequency of a pass-band or stop-band at which the attenuation reaches a specified value.

151-01-67

low-pass filter

A filter having a single pass-band extending front zero frequency up to the cut-off frequency.

151-01-68

high-pass filter

An electric energy transducer that converts alternating current to unidirectional current.

151-01-58

invertor

A filter having a single pass-band extending from the cut-off frequency upwards.

151-01-69

band-pass tilter

An electric energy transducer that converts uni- A filter having a single pass-band, ncithcr of the cut-off directional current to alternating current. frequencies being zero or infinite.

151-U-59 151-01-70

phase shifter band-stop filter

An electric transducer that introduces a phase change between input and output.

151-01-60

(electric) sensor

A filter having a single stop-band, neither of the cut-off frequencies being zero or infinite.

151-01-71

electronic tube

Au electric signal transducer that converts a signal of any kind into an electric signal.

151-01-61

(electric) actuator

An electric transducer that converts an electric signal into a signal of any kind, such as nlechanical displacement.

151-01-62

amplifier

A device in which conduction takes place by electrons or ions between electrodes through a vacuuni or gaseous medium within a gas-tight envelope.

151-01-72

vacuum tube

A device used to increase the value of a quantity by nleans of energy drawn from an external source.

151-01-63

oscillator

A device producing alternating current whose frequency is d~~termined by the characteristics of the device.

An electronic lube evacuated to such a degree that its electrical characteristics are essentially unaffected by the ionization of any residual vapour or gas.

151-01-73

gas-filled tube

151-01-64

[151-01-651

An electronic tube in which the electrical characteristics are substantially established by the ionization of deliberately-introduced vapour or gas.

151-01-74

semiconductor device

A device whose essential characteristics are due to the flow of charge carriers within a seniiconductor material.

151-01-75 pass [stop]-band photoelectric device

A frequency band throughout which the attenuation is A device whose essential characteristics arc due to the

4

IS 1885 (Part 74):1993 IEC Pub 50(151)(1978)

emission of electrons caused hy the absorption of 151-01-77 photons.

151-01-76

delay line

matching transformer

A transformer designed for insertion between IWO An electric device specifically designed to introduce a circuits having different impedances to optimize the desired &lily in the transmission of a signal. power of the signal transferred.

SECTION 151-02 - CONNECTIONS OF ELECTRIC CIKCIJITS

151-02-01

closed circuit

A circuit with a continuous path for current.

151-02-02

open circuit

A circuit in which the continuity of the path for current has been broken.

151-02-03

Lo collllect

To join conductors so that they are in electrical contact with one another.

151-02-04

connection

1. A junction between conductors.

2. A conductor or circuit for joining terminals or other colldllctors.

151-02-05

connection

A mode of com~ecting conductors or devices.

Examples: series, parallel, delta, star correction.

151-02-06

interconnection

The connection of distinct networks to each other.

151-02-07

series connection

The romlection of devices so that the same current passes through all of them.

151-02-08

parallel connection

The connection of devices so that the same voltage is

applied to all of them.

151-02-09

resonant circuit

An electric circuit operating near resonance.

151-02-10

series-resonant circuit

A resonant circuit with a single path containing capacitance and inductance in series.

isi-0x11

parallel-resonant circuit

A resonant circuit with two paths in parallel, one containing capacitance and the other inductance.

151-02-12

hankof.....

. ..I). - bank

A number of devices of the same kind so connected as to act together.

151-02-13

single-phase (voltage)*souree

1. A source supplying a single alternating voltage.

2. By extension, a set of alternating voltages having consta.nt ratios-of their instantaneous values.

151-02-14

polyphase (voltage) source

A source supplying a set of two or more interrelated alternating voltages Xhat have a common frequency but normally differ by a constant time-lag; they generally have similar amplitudes and waveforms.

;.

* All definitions applying to voltage sources can by extension be applied to current sources.

IS 1885 (Iart 74) 1993

IEC Pub 50 (151) (1978)

151-02-15

syninietrical polyphase (voltage) source

A plyphase source whose m alteruating voltages have the same waveform and the same amplitude and whose successive time-lags arc equal to the same whole multiple of the fraction l/m of the period.

u;(t) = II [l + (1 - )E]

i = 1, 2 . . . . m

where 1 is the period and k is an integer. usually 1.

151-02-15 [17] [NJ [lY]

2-phase [3-phase] [Cphase]........

[m- phase ] (voltage) source

Apolyphasc source supplying two, [three] [four] . ..[m] alternating voltages.

151-02-20

qum-ter-phase (voltage) source

A plyphase source supplying two alternating voltages of the same amplitude, with a time-lag equal to

one-quarter of a period.

151-02-21 [22]

single-phase [polyphase] device

Asiugle-phase [polyphase] source, ora &vice intended to be energized by such a source.

151-02-23

star-counec.ted device

An \~~-l)hasc device whose HZ branches have a CO~~IIUOII IlOdC.

151-02-24

mesh-comected device

An m-phase device whose nz branches form a single loop.

151-02-25

deltn-connected device

A three-phase mesh-conncrted dcvicc.

151-02-26 [27]

single phase [polyphase] circuit

A set of iutcrconnected single-phase [polyphase] devices.

SHTION 151 - 03- REHAVIOUR AND IJSE OF ELECTRICAL DEVICES

151-03-01

chauge-over switching

The transfer of connections frmu one set of conductors to auothcr.

151-03-05

output power

151-03-02

commutation

Change-over switching in a periodic and automatic lllilllller.

151-03-03

cycle of operation

A series of operations that may be repeated at will or autoinatically.

15 l-03-04

input power

The total power supplied to a device or assembly of devices.

The power delivered by a device in a specific form and for a specific purpose.

151-03-06 [07]

input [output]

A qualifying term applied to quantities : (voltage, current, impedance, . . . ...) or to components (terminals, leads , . . ...) which are associated with the reception [delivery] of power or signals.

151-03-0x

loud

1. A device that absorbs power.

2. The power delivered by a device.

151-03-09

to load

To cause a device or circuit to deliver power.

6

151-03-10

to chu-ge

To store cncrgy in a device.

IS 1885 (Part 74) : 1993

IEC PllI, 50 (151) (197X)

151-03-22

overload (as a noun)

The cxccss nf actual lo;~d over full load.

151-03-11 /VO,C. - Thr ter~n overload should nor hr used as il synonym

to discharge for overcurrcnl.

To extr;lct iill or part ofthc energy stored in a devkc. 151-03-23

151-03-12 syuciirouisni (of periodic quanlities)

on load

on-load operatiou

The operation in which a device or circuit supplies output power.

151-03-13

no-load operation

The oper;ttion ofa device or a circuit from which there is no output power (but under orherwisc uorlual operatiilg conditions).

151-03-14

open-circuit operation (of a circuit or a generator)

No-load operation with zero output current.

151-03-15

short-circuit operation (of a circuit or a geileriltor)

No-load opmtliou with zero oulpul voltage, the output tenuiuals being short-circuited.

The condition where IWO or more periodic quantities of one or more devices have the same frequency.

151-03-24

to synchronize

To bring IWO or more devices or circuits into synchronisni.

151-03-25

tuning (Olil device)

The process of adjusting one 01 the resonance frcqucncies of a device by varying the value of OIIC or more of its pilralllCters.

151-03-26

characteristic

A relationship between two or more variable quantities which describes the. pcrfortnance of a device under giveu conditious.

M-03-27

151-03-16 iusulaut

full load A nlaterial, geucrally a diclcctric, used lo prevent

The highest value of il load specified for rated couduction current.

conditions of opmltion. 151-03-28

151-03-17 to insulate

efticieucy To prevent conduction between sepilrale conductive

The ratio olthe output power to the input power.

151-03-18

bodies.

151-03-29

to isolute

loss; losses 1. To disconnect completely a device or circuit from Thr difference between the input power and the output other devices or circuits. power of a device. 2. To provide (by separation) a specified degree of 151-03-19 [20] prolcction from any live circuit.

over-voltage [over-current] 151-03-30

A voltage [current] of a value exceeding the highest insulatiou (material)

rated value. All the material used to insulate a device.

151-03-21 151-03-31

under-voltuge insulatiou (property)

A voltage of a value falling below the lowest rated All properties acquired by a conduclor by virtue of its value. being insulated.

7

IS 1885 (Part 74) : 1993

IEC llh 50 (151) (197X)

151-03-32 151-03-41

insulation resistance slwrt circuit

Tltc resistance under specified conditiotts bctwccu two Theaccidental oritttentiottalcottttectiott, by a relatively conductive hlics S~]~illXkd by itisuIalittg tnaterial. low resistance or ittiI~edance of two or niorc points in a

151-03-33 circuit which are normally at different voltages.

151-03-42 [43] [44] loss allgle (under SillUSoiditl conditions)

The angle whose tattgettt is the ratio of the active power resistive [inductive] [capacitive]

to the absolute value of the reactive power. Applies to a device or circuit in which, under given

151-03-34 conditions, the predominant quantity is resistance [inductance] [capacitance].

qudity factor 151-03-45

Q factor reactive

The ratio of the absolute value of the reactive power to the active power. Applies to att inductive or capacitive device or circuit.

151-03-35 151-03-46

leakage current

earth current (deprecated in this sense)

conductive

Applies to a medium to indicate that it ratt conduct current.

The current in a path olher than that desired, due to 151_(13.47 imperfect insulation.

conducting

151-03-36 Applies to a device or a circuit IO indicate that it is

eztt-th current carrying a current.

All the leakage currents and capacitive currents 151-03-4s [49]

bclwecn a cottductor at~d the earth. live [dead]

151-03-37 Applies to a device or a circuit to indicate that a voltage is [is not] applied.

creepage distance 151-03-50

Theshortcst distanccalottg the surface ofthe insulating nieterial hetwecu two conductive parts.

electricity

1. The manifestation of a form of energy associated 151-03-38 with static or dynatttic electric charges.

voltage grading 2. The special field of science attd tcchttology dealing with electric phenomena.

The reduction of marked inequalities of potential gradient in or along ill1 insulator or insulation. 151-03-51

151-03-39 electric (adjective)

bult Coiitaittitig, producing, arising from, or actuated by electricity, such as electric energy, electric lamp,

Any undesired change that impairs normal operation. electric motor.

151-03-40 151-03-52

earth fault electrical

A fault caused by a conductor being connected to earth Related to or associated with electricity, but not having or by the insulation resistance to eaith becoming less its properties or characteristics, such as electrical lhatt a specified value. engineer, electrical handbook.

8

IS 1885 (Part 74) : 1993 IEC 1'111~ 50 (151) (1978)

SE(:TION 15144 - IEKFORMANCE AND TESTING

A suitable approximate quantity value used to

dl!SigIliltC or identify il component, device or equilmciil.

151-04-02

limiting value

In ;I spccification, the greatest or s~~~;lllcsI admissible

value of one of tbc quanlilics.

151-04-03

IXtt!d VilllJt!

A q~;11~1ily V>\IUC i\ssigilcd, gcllerally by :I nlanfilclurer,

for il specified operating condition 01 il C0lllpllC1lt, dcvicc or equipnimt.

151-04-04

ratiug

The set of rated values and operating conditions.

15 L-04-05

environmeutul conditions

Those characteristics of the cnvironnmlt (altit\Idc,

temperalure, huinidity, . . ...) which may affci.1

pcrlbrnlilllrc.

151-04-06

duty

duty cycle

IOUd Cycle (ClepUXil ted)

A sequcllcc of operating conditions to which iI

conipoiid, device or cquipnrent is sul?jectcd.

151-04-07

uoiiiterrupted duty

A duty wilfiout ;Illy otl-load period.

151-04-08

coutinuous duty

A duty ;It :I subslil~ltially COIlSliIllt Ioird for HI1

indefiiiitcly long time.

151-04-09

iutermitterlt duty

A duty with olI-lo;ld intervals alternating with Off-lOad illtCrVil1S.

151-04-10

short-time duty

An intermittent duty with (~ll-loild iutrrvals short in CC~Ul1~iltiSOll with Off-lOad.

151-04-11

periodic duty

A typ: of duty in which operatioll whether at col\stitM or variable IOild is regllhrly repcatcd.

151-04-12

vuryiug duty

Opcratiorl i1t lo;~ds illld for intervals ot time b

151-04-21

conmiissioning test

A test OII iI dcyicc or cquipucnt carrid out OII site, to prove llic r~nrrectness ofillstallalion and operation.

151-04-22

maintenance test

A test c;Irricd out periodically on R device or equipment 10 :isiG.rliiin and, if necessary, IIN ke certain iIdjllStlll~lllS lo ensure lhl its perforlllance mliii ills

wilhin spcrificd limits.

A aCCe,ln ICSI

a~luator (rlcctric)

air gap (of 2 magnetic circuit)

amplifiet

anode (01. a device)

hand-pass filter

band-stop filter

bank of....

-haok

Ihililar winding

hlockiug capacitor

hushat

bushing (insulating)

(-1 capacitive 15 l-03-44 capacitor 1.51-01-35 capacitor hushing 151.01-12 cathode (.of a device) 151-01-06 change-over switch 151-01-46 change-over switching 15 l-(13-01 characteristic 15 1-03~26 (to) charge ISI-(13.10 chassis 151~!)I-09 choke (deprecated) 151-01-34 closed ciruit 1.5 I -w-o I coil 151~01-21

comn~issioniug test 151~04-21

commutation 151-03-02

cundcnscr hushing (drprcc;tted) 151-01-12 conducting 15 I-03-47 conductive 151-03-46 conductor 15 1-o l-02 (to) connect 15 l..1l,.O3 connection I5 l-O-04

conneclion 15 1-07-05

continuous duty 15 l-04-08

core (magnetic) 151-01-15 crceptg: dislanc~e 15 l-03-37

cut-off Crequency 151.OI-hh cycle of operation 15 I-03-113

D dead 15 I-03-49 delay line 151-01-76 delta-connected device 15 l-01-25 (IO) discharge 151-03-l 1 duty I.5 l-04-06 duty cycle 151-04-06 duty ratio 151-04-13

E earth 151-01-07 earth (ing-conductor) 151-01-08

IS 1885 (Part 74) : 1993 IEC: Pub 50 (151) (1978)

INDEX

151-04-10

151~01.61

151-01-19

151.111-62

151-01-05

151-01-69

151-01-70

151~02-12

151-02-12

151-01-24

151~n1-36

151-01-19

151~01.II

earth current 151-03-36 earth current ( deprecated in this sense) 151-03-35 earth fault 151-03-40

efficiency 151-03-17

electric 151-03-5 I (electric) :bctuatut 151-01-61

clec1rical 15 l-03-52

electrical dcvice 151-01-01

electrical rrlay 151-01-42

electric energy transducer 151-111-49

(clcclric) generatot 15 I -n1-52 electric machine 151-01-51

(clcctric) mot~lt 151-01-53

electric screen 151-01-14

(electric) sensor 151-01-60

(clrcrtic) shunt 151-01-43

clcctric signal transducer 151-01-50

electricity 1s I-03-50

elcctrodc I.cl-01-04 cletromagllct 151-01-39 elcctromagnctic screen 151-01-16 clcctronic tu c 151-01-71 endurance test 151-04-19 environmental conditions I5 1-04-05

fault

4-phase (voltage) source

fra mc

Ircqurncy changer (IJSA)

frequency convertor

full load

I5 1-03-3Y

I5 1-02-1s

151-01-09

151-01-55

151-01-55

151-03-16

gas-filled tube

(electric) generator

grading screen

ground (except llK)

151-01-73

151.01-52

151-01-17

I5 1 -Ol-Cl7

IS I-Ol-6S

inductive

inductor

i u pu t input power

insulant

(to) insulate

(insulating) hushing

insulation (malrrial)

insulation (property)

insulation level

insulation resistance

insulator

interconnection

intermittent duty

15 l-03-43

151-111-33

I5 1.03.06

I5 1-03-m

1s I-03-27

15 1-03-2s

151-111-11

15 1.03.30

151-03-31

I51 -04-14

15 I -03-32

151 -r11-10

151 -02-06

151 -04-09

11

IS 1885 (h-t 74) : 1993 1Iix: Iul, 50 (151) (1378)

invcrlul

(lo) isolale

M

no-load up-ration

nominnl value

on load

0 n-in ad 0 pe ra t i 0 n owotf switch

open circuil

open-circuit operalion

oscilli~lof

oulpul

UQUI pow

O"C3~-CU~K?lll

overload (suhslanlivc)

over-voltage

I pir:lllel connrclion 15 l-02-08

parallel-rcsonanl circuil 151-02-l 1 pass-hand 151-01-64

periodic duly 151-04-11 pernianenl lapnet 151-01-38

phase convcrlor 151-01-56

phase shifter 151-01-59

photoclcctric device 151.01-75

poles of a magnrl 151-01-40

polyphasc Circuil 151-02-27

polyphase device 15 1-02-x

ISI-0-5s I5 ! -03-39

I.il-01-41

15 l-Ol-16 15 I-03-35

151.O%lY 15 I-04-02 151-03-4s

1.5 I-03-08

151~03-(lo

15 I-(14.06

151-03-1x

151-03-33

151-03-18

151-01-67

151-01-37

151-01-2s 151-01-1s

151.b-44 15 l-04-22.

151-01-77

15 I -O-14

151-01-53 151~w-i9

151-03-12 151-03-11

151~(II-45

15 1.02.02

151-03-14

151-01-63

I5 I-03.07

15 l-03-05

151-03-70

15 l-03-2.!

151-03-14

s sampling lrsl

screen

selector swilcli

srmiconductor dcvicr

(cleclric) wnsor

scrims conueclion

series-resonant circuit

shield

shield (1JS.A) (deprecated in IJK in this wnse)

shorl circuit

short-circuit operation

short-lime duty

(eleclric) shun1

single phase circuit

single plxlse device

single phase( vollage) source

smoothing inductor

solenoid

spark-gap

star-connected decvice

stop hand

symmrtricitl polyphase (voltage) source

synchronism (of periodic quanlities)

(lo) synchronize

Q

quality fnctor

0 f;tclor

quarlcr-phase (vollagc) sourer

ralcd value

raling

rcaclive

rec[ilicr

(electric;ll) relay

rcsislivr

rwislor

resonant circuil

reversing swilch

routine IcsI

r.

1 terminal (as a component) 151-01-03

thermistor 151-01-32 3-phase (voltage )sourcc 151~02-17 lo charge 15 l-03-10 to connect 151-02-03 to discharge 151-03-l 1 lo insulate 15 l-03-28 lo isolate 151-03-29 to load 151-03-09

IO synchronize 151-03-24 lranslormer 151-01-54

tu,ning (of a device) 151-03-2s turn 151-01-20

Z-phase (voltage) source 151-02-16

151.02-14

15 I-03-34 15 I-03-34

151-02-20

151~04-03

15 I-04-04 1.5 l-03-45

lS!-01-57

I5 I-II I-42

151-03-42

151-01-30

15 l-02-09 151-01-47

151-04-16

151-04-17

151-01-13

151-01-46 151-01-74 151-01-60 15 l-02-07

151-02-10

151-01-18

151-01-13

151-03-41

151-03-15

151.04..I0

151-01-43

15 I-02-26

1.51-02-21 151-02-13

151-01-34 1.51-01-22

151-01-48

151-02-23

151-01-65

151-02-15

15 l-03-23

151-03-24

12

1ype lost 151-04-15 varying duty

voltage grading

under-voltage

uninterrupted duty

vacuum tube varistor

V

151-03-21

151-04-07 winding

wound core

1.51~01-72

lsl-r)1-31 yoke

IS 1885 (Part 74) : 1993 IEC Pub 50 (151) (1978)

151-04-12

151-03-38

w 151-01 23

151-01-27

Y 151-01-28

13

Standard Mark The use of the Standard Mark is governed by the provisions of the Bureau q Indian

Standards Act, 1986 and the Rules and Regulations made thereunder. The Standard Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well defined system of inspection, testing and quality control which is devised and supervised by BIS and operated by the producer. Standard marked products are also continuously checked by BIS for con- formity to that standard as a further safeguard. Details of conditions under which a licence for the use of the Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards.

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director ( Publications ), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are any reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of BIS Handbook and Standards Monthly Additions. Comments on this Indian Standard may be sent to BIS giving the following reference:

Doe : No. ETD 01 ( 3432 )

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

BUREAU OF INDIAN STANDARDS

Headquarters:

Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002 Telephones : 331 01 31, 331 13 75

Regional Offices :

Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg NEW DELHI 110002

Eastern : l/14 C. I. T. Scheme VII M, V. I. P. Road, Maniktola CALCUTTA 700054

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Western : Manakalaya, E9 MIDC, Marol, Andheri ( East ) BOMBAY 400093

Branches :

Telegrams : Manaksanstha ( Common to all offices )

Telephone

I 331 01 31 331 13 75

\

37 84 99, 37 85 61 37 86 26, 37 86 62

I 53 38 43, 53 16 40 53 23 84

I

235 02 16, 235 04 42 235 15 19, 235 23 15

t 632 92 95, 632 78 58 632 78 91, 632 78 92

AHMADABAD. BANGALORE. BHOPAL. BHUBANESHWAR. COIMBATORE. FARIDABAD. GHAZTABAD. GUWAHATJ. HYDERABAD. J ATPUR. KANPIJR. LUCKNOW. PATNA. THlRUVANANTHAPlJRAM.

Irlntod at New India Priotinp Prssa. Khurja. Ind,s

tt: ( Reaffirmed 2004 )