某核电工程发电机中性点接地方式及接地装置选型的研究  

Study on Generator Neutral Point Earthing Method and Earthing Device Selection in a Nuclear Power Project

作　　者：秦高原[1] 沈云[1] 

机构地区：[1]广东省电力设计研究院,广东广州510663

出　　处：《广东电力》2010年第1期58-60,共3页Guangdong Electric Power

摘　　要：首先,对我国大容量发电机主要采用的经消弧线圈谐振接地和经变压器高阻接地方式进行了对比分析,认为经高阻接地利于机组的绝缘和正常运行;其次,对比分析了某核电工程和某火力发电厂一期工程3—5号机组的发电机中性点接地方式,认为核电工程在发电机中性点和厂用变压器高压侧采用单相接地保护的方式比火力发电厂在发电机中性点和发电机出口侧采用单相接地保护的方式好,可节省投资、减小施工难度、避免大量的检修和维护工作,同时介绍了接地变压器的选型计算;最后,提出在满足核电站安全要求的条件下,可以考虑将一点接地的方式应用到核电站上。Two main grounding modes for large-capacity generators in China, i.e. the resonant mode via arc suppression coil and the high-resistance mode via transformer, are compared and analyzed first. Then the generator neutral point earthing methods of some nuclear power project and Phase I （Units 3-5） of some thermal power plant are compared and analyzed. It is concluded that the single-phase grounding protection at generator neutral and HV side of auxiliary transformer in nuclear power project is better than the single-phase grounding protection at generator neutral and generator outlet side in thermal power plant, which can save investment, simplify construction and avoid massive maintenance. The calculation for choosing grounding transformer is also described. It is proposed at last that one-point grounding mode can be applied to nuclear power stations while meeting the security requirement of nuclear power stations.

关 键 词：发电机 接地变压器 中性点 接地方式 

分 类 号：TM310.73[电气工程—电机]