电力变压器 - 第21部分:步进电压调节器的标准要求 术语和测试代码

[中文适用范围]： 本文件描述了液浸式、单相和三相、50 Hz 和 60 Hz、自冷和强风冷却的配电、架空和变电站用分压器标准，容量在 1000 kVA（单相单元）或 3000 kVA（三相单元）及以下，电压在 34 500 V 及以下（最低 2 400 V）及其相关控制器的电气、机械和测试要求。提供了适用于 IEC 或 IEEE 上下文的适用要求、参考文献和定义，并说明了其使用方法。 [外文原描述]： 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