摘要
本文主要针对国际上普遍采用的高电阻接地方式和国内广泛采用的谐振接地方式，对发电机定子绕组一点接地时的铁芯烧损情况进行了试验和分析研究。文中建议：对于大型发电机组，应优先采用高电阻接地方式；谐振接地尽管允许带故障短时运行，但运行时间应尽可能缩短，一般不宜超过半小时。
Although high resistance grounding method is widely used in the world, the resonant grounding of generator is still the mainmethod used in China。 In this paper, under the condition of two grounding method above mentioned an experimental research wasmade for iron core ablation caused be arcing when a one-point earthing fault appeared in stator winding.the ablationd of iron corewas slight in both conditions when grounding current was 30A and the duration of arcing was lsec,or when grounding currentwas 5A and the duration of arcing was 60min。 Considering the influences of grounding fault current,overvoltage and the flexibil-ity of power system operation it is recommended that the high resistance grounding method should be adopted for large scale gen-erator.For the generators in witch the resonant grounding method is used the duration of operation generally should not be longerthan 30 min when the one-point earthing fault in stator winding appears.
出处
《电网技术》
EI
CSCD
北大核心
1994年第4期13-17,共5页
Power System Technology
关键词
发电机
定子
中性点接地
Gererator Stator winding Iron core Neutral grounding Arcing overvoltage
