定子接地基波零压和20Hz低阻保护的一些问题探讨

定子绕组接地故障是发电机易发的故障,现在一些大型机组在对定子接地保护配置时,要求以基波零序电压保护和20Hz电源注入式低阻保护构成发电机定子接地保护方案,尤其是大型水轮发电机组。本文在叙述了两种保护的基础上,对这两种保护的实现方式,相关定值的整定方法及联系,以及两种保护之间的联系作了一些探讨,以期这两种保护能更好的配合。

The discussion of zero sequence voltage and 20Hz low resistance protection for stator grounding fault

The single phase stator grounding fault is easily happened,now some large generators require the zero sequence voltage protection and the 20Hz injecting electrical source low resistance protection as the stator grounding protection,especially the huge hydroelectric turbine generator sets.This paper discussed the implementation style of them,discussed the setting way of the two kinds protections and the relationship of them,discussed the relationship of the two kind protections,expect the two kind protection cooperated better.