新的！IEC 61921:2017作为IEC 61921:2017 RLV提供，其中包含国际标准及其红线版本，显示了与上一版本相比技术内容的所有变化。IEC 61921:2017适用于低压交流并联电容器组旨在用于功率因数校正目的，可能配备内置开关设备和控制设备，能够连接或断开组的电源部分，以校正其功率因数。低压功率因数校正组（除非下文另有说明）和（如适用）应符合IEC 61439-1和IEC 61439-2的要求。这第二版取消并取代了2003年出版的第一版。它构成技术修订。与上一版相比，此版本包括以下重大技术变更:许多关于验证方法的变更，以符合IEC 61439-1；标记的修改；增加额定输出的常规校验；新的附件D，提供温升验证方法指南；规范性参考文献的更新；一般编辑评论。 关键词:低压交流并联电容器组

NEW!IEC 61921:2017 is available as IEC 61921:2017 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 61921:2017 is applicable to low-voltage AC shunt capacitor banks intended to be used for power factor correction purposes, possibly equipped with a built-in switchgear and controlgear apparatus capable of connecting to or disconnecting from the mains part(s) of the bank with the aim to correct its power factor.  Low-voltage power factor correction banks if not otherwise indicated hereinafter and where applicable comply with the requirements of IEC 61439-1 and IEC 61439-2.  This second edition cancels and replaces the first edition published in 2003. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: numerous changes regarding verification methods to align with IEC 61439-1; modification of marking; add routine verification of rated output; new Annex D with guidance on methods for temperature rise verification; update of normative references; general editorial review.

Keywords: low-voltage AC shunt capacitor banks