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
IEC 60076-21:2011/IEEE Std C57.15:2009 - Description of design types, tables of 50 Hz and 60 Hz ratings, supplementary ratings, construction, and available accessories are provided. Methods for performing routine and design tests applicable to liquid-immersed single and three-phase step-voltage regulators are described. Winding resistance measurements, polarity tests, insulation power factor and resistance tests, ratio tests, no load loss and excitation current measurements, impedance and load loss measurements, dielectric tests, temperature tests, routine and design impulse tests, short-circuit tests, control tests, calculated data, and certified test data are covered.
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