双周期可调节的变极性方波电压注入式转子接地保护  

Injecting Variable Polarity Square Wave Voltage with Adjustable Two Periods for Generator Rotor Ground Fault Protection

作　　者：李哲[1,2] 季学军[2] 仇新宏[2] 

机构地区：[1]中国电力科学研究院,江苏省南京市210003 [2]国电南瑞科技股份有限公司,江苏省南京市210061

出　　处：《电力系统自动化》2012年第16期98-101,共4页Automation of Electric Power Systems

摘　　要：发电机组转子偏心是一个普遍存在的现象,严重的转子偏心将影响发电机组转子一点接地保护的正确运行。结合转子对地电容对转子一点接地保护的影响,提出了可调节2种周期时间的注入方波转子接地保护方法。通过调节方波极性变换周期的大小,避免了由于转子对地电容引起的转子一点接地误报。通过调节直流分量采样计算窗口周期的大小,避免了由于转子偏心引起的转子一点接地误报。该方法对于各类机组由于转子对地电容和转子偏心引起的转子一点接地误报现象起到了很好的抑制作用,基本解决了长期以来困扰转子一点接地保护运行不稳定的问题。The generator rotor eccentricity is a common phenomenon, and severe rotor eccentricity will affect the proper operation of that ground fault （GF） protection. Concerned with the impacts generated by rotor-to-ground capacitance on rotor one point GF protection, a method with adjustable two periods injecting square wave rotor GF protection is proposed. By adjusting the period of square wave polarity transformation, the rotor one point GF false alarm caused by the rotor-to-ground capacitance is avoided. By adiuSting the direct current component of sampling computation window period, the rotor one point GF alarm caused by the rotor eccentricity is thus avoided. This method plays a good inhibitory effect to one point GF false alarm for all kinds of generator Units due to the rotor-to-ground capacitance or the rotor eccentricity, which could solve unstable operation oroblem of rotor one ooint GF.

关 键 词：转子接地保护 转子偏心 双周期可调节 变极性方波电压 

分 类 号：TM862[电气工程—高电压与绝缘技术]