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IEC 60076-21-ed.2.0
Power transformers - Part 21: Standard requirements, terminology, and test code for step-voltage regulators
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STANDARD published on 7.12.2018
The information about the standard:
Designation standards: IEC 60076-21-ed.2.0
Publication date standards: 7.12.2018
SKU: NS-908721
The number of pages: 144
Approximate weight : 463 g (1.02 lbs)
Country: International technical standard
Category: Technical standards IEC
The category - similar standards:
Annotation of standard text IEC 60076-21-ed.2.0 :
IEC 60076-21:2018 describes electrical, mechanical and test requirements of liquid-immersed, single- and three-phase, 50 Hz and 60 Hz, self and forced-air cooled, distribution, overhead and substation, step-voltage regulators, 1 000 kVA (single-phase units) or 3 000 kVA (three-phase units) and smaller, 34 500 volts and below (2 400 V minimum) and their associated controls. Requirements, references and definitions relevant to either IEC or IEEE contexts are given and their use is described in Clause 4. This publication is published as an IEC/IEEE Dual Logo standard. This second edition cancels and replaces IEC 60076-21, published in 2011, and IEEE Std C57.15-2009. This edition includes the following significant technical changes with respect to IEC 6007621:2011/IEEE Std C57.15-2009: a) updated list of normative and bibliography IEC and IEEE references and their associated text; b) updated tables of preferred ratings for inclusion of maximum system voltage (Um), nominal system voltage and rated voltage (Ur); c) inclusion of tables for optional fan-cooled ratings, external dielectric clearances and sound pressure levels; d) revision of short-circuit requirements for distribution and substation voltage regulators; e) inclusion of an universal interface between control enclosure and apparatus; f) inclusion of tap-changer routine and type tests; g) inclusion of audible sound pressure emissions test procedures; h) inclusion of tank enclosure integrity type test procedures; i) update of control environmental IEC reference test standard. Keywords: step-voltage regulators
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