IS/IEC 62271 : Part 202 : 2022 High-Voltage Switchgear and Controlgear - Part 202 a.c. Prefabricated Substations for Rated Voltages Above 1 kV and up to and Including 52 kV

ICS 29.130.10

ETD 08

NATIONAL FOREWORD

This Indian Standard (First Revision) which is identical to IEC 62271-202 : 2022 'High-voltage switchgear and controlgear - Part 202: a.c. prefabricated substations for rated voltages above 1 kV and up to and including 52 kV' issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on the recommendation of the High Voltage Switchgear and Controlgear Sectional Committee and approval of the Electrotechnical Division Council.

This standard is published in various parts. Other parts in this series are:

Part 1 Common specifications for alternating current switchgear and controlgear

Part 100 Alternating-current circuit-breakers (first revision)

Part 101 Synthetic testing

Part 102 Alternating current disconnectors and earthing switches

Part 103 Alternating current switches for rated voltages above 1 kV up to and including 52 kV

Part 104 Alternating current switches for rated voltages higher than 52 kV

Part 105 Alternating current switch-fuse combinations for rated voltages above 1 kv up to and including 52 kv

Part 106 Alternating current contactors, contactor-based controllers and motorstarters

Part 109 Alternating-current series capacitor by-pass switches

Part 110 Inductive load switching

Part 111 Automatic circuit reclosers for alternating current systems up to and including 38 kV

Part 201 a.c. Solid- insulation enclosed switchgear and controlgear for rated voltages above 1 kV up to and including 52 kV

Part 203 a.c. Gas-insulated metal-enclosed switchgear for rated voltages above 52 kV

Part 207 Seismic qualification for gas-insulated switchgear assemblies for rated voltages above 52 kV

Part 300 Seismic qualification of alternating current circuit-breakers

Part 301 Dimensional standardisation of high-voltage terminals

This standard was first published in 2016 and was identical to IEC 62271-202 : 2014. This revision has now been brought out to align this standard with the latest international practices. This edition includes the following significant technical changes with respect to the previous edition:

a) Modification of the title and scope to include high-voltage switchgear prefabricated substations;

b) In 7.2.101, the possible influence of surrounding elements on the dielectric performance of high-voltage components as high-voltage switchgear and controlgear and high-voltage interconnections non-metal-enclosed or without earthed screen are now considered;

c) New informative Annex G with testing procedure to evaluate the impact of solar radiation in temperatures inside the enclosure and how to apply it;

d) New informative Annex H for appropriate consideration of installation conditions of electronic equipment;

e) The rated power of a prefabricated substation is now defined as a three-parameter rated value. see 5.101.1;

f) Minimum dimensions for access doors to the prefabricated substation in 6.104.4 and for free height of operation aisle in 6.105.3 have been introduced; and

g) Continuous current (temperature rise) test methods have been revised/clarified where necessary Figure D.1, which shows the mineral-oil-immersed power transformer load factor inside the enclosure, has been corrected.

The text of IEC standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words 'International Standard' appear referring to this standard, they should be read as 'Indian Standard'.

b) Comma (,) has been used as a decimal marker, while in Indian Standards the current practice is to use a point (.) as the decimal marker.