大型发电机中性点接地方式的反思与忧虑——致各大发电公司、发电厂和设计院同行  

Reconsideration and Anxiety of Neutral Grounding Mode for Large Generator

作　　者：王维俭[1] 桂林[1] 王祥珩[1] 孙宇光[1] 盛和乐[2] 李和[2] 张琦雪[3] 

机构地区：[1]清华大学电机系,北京市100084 [2]北京国电华北电力工程有限公司(华北电力设计院),北京市100011 [3]南京南瑞继保电气公司,江苏省南京市211100

出　　处：《电力设备》2007年第11期1-4,共4页Electrical Equipment

摘　　要：2006午两起大型发电机毁损事故均由机端单相接地故障引起，两台发电机中性点均经接地变压器电阻接地，单相接地故障电流达4A和32A。如果发电机中性点经消弧线圈接地，使单相接地故障电流减到1～2A，就可能避免发生毁损发电机的灾难性事故。在大型发电机中性点接地方式上的经验与教训值得反思，应吸取教训，消除隐患。In 2006, two large generators, which neutrals are grounded by method of the distributed transformer （high resistance） grounded, were both damaged by the single - phase ground faults occurring at the terminals of the generators. The ground fault currents, one is 4 A, another is 32 A. If the two generators had been grounded via ground - fault neutralizers, which would limit the fault current to 1 -2 A, the accidents of stator damage could not have happened. Experiences and lessons on the grounding methods of large - sized generator were worth to be reconsidered. The lessons and remove the hidden danger should be drawn and removed.

关 键 词：大型发电机 中性点接地方式 单相接地故障 

分 类 号：TM31[电气工程—电机]