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Ieema Journal for Testing of Power Transformer
3231 ( Parf l/Set
1) - 1986
PART 1 Section GENERAL 1 Contact REQUIREMENTS Performance
Relays Sectional Committee, ETDC 35
Representing Chairman English Electric Co of India Ltd, Madras SHRI N. NATH Members SHRI T. V. G. MENON ( Alternate to Shri N. Nath ) Hindustan Steel Ltd, Ranchi SHRI R. D. BATRA SHRI G. K. SARAF (Alternate) SHRI R. C. BHATIA Delhi Electric Supply Undertaking, New Delhi SHRI M. K. CHAUDHARY( Alternate ) Tamil Nadu Electricity Board, Madras SHRI T. B. CHIKKOBA SHRI V. V. SAMPATU( Alternate ) Railway Board, New Delhi DEPUTY DIRECTOR ( PSI-II ) DEPUTY DIRECTOR, S 6-zT ( Alternate ) Central Electricity Authority, NewDelhi DIRECTOR ( CIP ) Directorate General of Supplies & Disposals SHRI K. L. GARG ( Inspection Wing ), New Delhi SHRI S. KRISHNA ( AIternate ) SHRI S. G. KARADKAR Bombay Electric Supply & Transport Undertaking, Bombay SHRI M. A. KARIM ( AIternate)
SHRI V. S. KAUSHIKKAR Larsen & Toubro Ltd. Bombay SHRI DEVENDER NATH ( Alternate ) SHRI G. K. MALVIYA Universal Electrics Ltd, 24 Pargauas SHRI C. GHOSH( Alternate ) National Test House, Calcutta SHRI B. C. MUKHERJEE
SHRI D. P. MUKHERJEE( Alternate ) SHRI NACHHATTER SINGH Bharat Heavy Electricals SHRI R. RAMASUBBAIAH ( Alternate I ) SHRI S. G. DESHPANDE ( Alternate II )
Ltd ( Continued on page 2 )
@I Copyright 1987 BUREAU OF INDIAN STANDARDS This publication is protected under the Endian Copyright Act ( XIV of 1957 ) and reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act.
IS : 3231 ( Part l/Set
( Contimud from page 1 ) Members
1 ) - 1986
Tata Consulting Engineers, Bombay SHRI A. A, PAW. SHRI P. P. KARHADE ( Alternate ) University ofRoorkee, Roorkee SHRI-A. K. RAJA . Hindustan Brown Boveri Ltd, Vadodara SHRI U. V. RAO SHRI P. U. BHAT ( Alternate ) Tata Hydro-Electric Power Supply Co Ltd, SHRI A. M. SAHNI Bombay SHRI V. S. DORAI ( Alternate ) ASEA Lid, Bombay DR M. T. SANT SHRI B. S. PALKI ( Alternate ) UP State Electricity Board, Lucknow SHRI B. S. SHARMA SHRI C. P. GUPTA ( Alternate ) Directorate General of Technical DevelopSHRI S. SIVASUBRAMANIAN ment. New Delhi SHRI P. K. HAL.DAR( Alternate ) Haryana State Electricity Board, Chandigarh SUPERINTENDING ENGINEER, HSEB, JIND SHRI HARNARINDER SINGH ( Alternate ) Natio~~,b~hysical Laboratory ( CSIR ), New SHRI S. P. SURI SHRI S. C. GARG ( Aitcrnate ) Engineers India Ltd, New Delhi SHRI G. N. THADANI SHRI S. G. GOI<HALE( Alternate ) Jyoti Ltd, Vadodara DR K. K. THAKKAR DR B. K. DASCUPTA ( Alternate ) Karnataka Electricity Board, Bsngalore SHRI B.K. VENKATESH SHRI K. T. RAMA~WAW ( Alternate ) Director General, BIS ( Ex-oJicio Member SHRI S. P. SACHDW, Director ( Elec tech ) Secretary SHRI K. M. BHATIA Joint Director ( Elec tech ), BIS
of IS : 3231 - 1965, ETDC
35/P 9
Convener SHRI B. S. SHARMA Members DR B K. DASGUPTA SHRI H. DE DIRECTOR( CIP ) SHRI P. KASWRI SHRI T. V. G. MENON SHRI A. A. PAUL 31~1 P. P. KARHADE( Alternate Start A. K. RAJA DR bl. T. SANT SHRI J. V. VAIDYA Jyoti Ltd, Vadodara Hindustan Brown Boveri Ltd, Vadodara Central Electricity Authority, New Delhi Tata Hydro-Electric Power Supply Co Bombay English Electric Co of India Ltd, Madras Tata Consulting Engineers, Bombay ) University of Roorkee, Roorkee ASEA Ltd, Bangalore Larsen & Toubro Ltd, Bombay UP State Electricity Board, Lucknow
IS : 3231 ( Part l/Set 1 ) - 1986
PART 1 Sestion 1 GENERAL RECHJIREMENTS Performance
0.1 This Indian Standard ( Part l/Set 1 ) ( First Revision > was adopted by the Indian Standards Institution on 26 November 1986, after the draft finalized by the Relays Sectional Committee had been approved by the Electrotecbnical Division Council. 0.2 The relays are intended to protect the electrical plant and equipment against damage in case of abnormal conditions occurring in the system. Protective relays act as sensing elements and may be suitably set to operate with the required discrimination. 0.3 This standard was first published in 1965. This revision has been brought out to take into account the experience gained since then and to align with the international practices to the extent found appropriate. This part/section is one of the new revised series, general introduction to which is given in IS : 3231 ( Part 0 )-1986*. The standards published in the revised series so far are: IS : 3231 Specification% for electrical relays for power system protection: General introduction and list of parts (jirsr ( Part 0 )-1986 revision ) Section 1 Contact (Part l/Set 1 )-I986 General requirements, performance (first revision ) ( Part l/Set 2 )-1986 General requirements, Section 2 Insulation tests (first revision )
*Specification for electrical relays for power introduction and list of parts (fivst revision). system protection
: Part 0 General
IS : 3231( Part l/See 1) - 1986 ( Part l/Set 3 )-1985 General requirements, Section 3 High frequency disturbance test for static relays
for principal ( Part 2/Set 1 )-1987 Requirements Section 1 All-or-nothing relays
for principal families, ( Part 2/Set 2 )-1987 Requirements requirements for General Section 2 measuring relays for particular group of ( Part 3/Set 1 )-1987 Requirements relays, Section 1 Non-specified time or independent specified time measuring relays ( Part 3/Set 2 )-I987 Requirement for particular group of relays, Section 2 Dependent specified time measuring relays ( Part 3/Set 3 l-1987 Requirement for particular group of relays, Section 3 Biased percentage differential relays 0.4 This standard is to be read in conjunction with IS : 12083 ( Part l)1986* to which it makes the reference and supplements where the special requirements for protection relays make this necessary. 0.5 According to the classification on hierarchical basis [ see IS : 3231 ( Part 0 )-1986t 1, this standard is a first level document. 0.6 In preparing this standard, assistance has been drawn from BS 142: Section 1.2 : 1982 Electrical protection relays : Part 1 Information and requirements for all protection relays, Section 1.2 Specification for contact performance, issued by the British Standards Institution. 1. SCOPE 1.1 This standard ( Part l/Set 1 ) specifies conditions for testing contact performance of electrical protection relays, criteria of contact failure for such relays and the assessment of performance data. 2. TERMINOLOGY 2.1 For the purpose of this standard, the definitions given in IS : 1885 ( part 9 )-19861 and IS : 12083 ( Part 1 )-1986 shall apply.
*Specification for fSpecification for introduction and list $Electrotechnical electrical relays: Part 1 Contact performance. electrical relays for power system protection: Part 0 General of parts ( firs? revision ). vocabulary : Part 9 Electrical relays (first revision ).
IS : 3231 ( Part l/Set 3. STANDARD RATED VALUES
The series given in 3.2 and 3.3 are 3.1 No rated values are specified. the preferred values for contact circuits of electrical protection relays. 3.2 Rated Voltages
rated voltages are as follows:
a) dc : 24, 48, 110, 125, 220 and 250 V 110, 415 and 415 V ( rms > 2/3 3.3 Rated Currents - Preferred rated currents are as given in 3.2 of IS : 12083 ( Part 1 )-1986. b) ac:-$g, 3.4 Frequency
of Operation -
Not applicable to protection
to protection relays.
3.5 Duty Factor 4. TEST
for testing the contact performance of electrical protection relays shall be as specified in 4 of IS : 12083 ( Part 1 )-1986 with the exception of the input energizing and characteristic quantities for measuring relays as given in 4.3.2 (a). For measuring relays used for protection, these quantities shall be as specified in the appropriate electrical relay standard for mechanical endurance tests forthe particular type of relay under consideration. 5. ASSESSMENT OF CONTACT PERFORMANCE
5.1 The assessment of contact performance shall be made in accordance with 5 of IS : 12083 ( Part 1 )-1986*, with the overriding requirement
that contacts intended to perform a circuit shall be capable of 1 000 rated operations. 6. PRESENTATION 6.1 The guidance followed. OF PERFORMANCE given
in 6 of IS : 12083 ( Part 1 )-1986
*Specification for electcrical relays : Part 1 Contact performance. 5
INTERNATIONAL Base Units QWltity Length Mass Time Electric current Thermodynamic temperature Luminous intensity
SYSTEM OF UNITS ( SI UNITS )
Amount of substance Supplementary Units Quantity Plane angle Solid angle Derived Units euantity Force Energy Power Flux Flux density Frequency Electric conductance Electromotive force
Unit newton joule watt webe r tesla hertz siemens volt Pascal
Symbol N J
W Wb T HZ S V PiI 1N
1 kg,m/?
1 Wb 1T 1 Hz 1S IV 1 Pa
= 1 v.s = 1 Wb/mz
= 1 c/s(s-l)
= = 1 A/V 1 W/A
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