基于冗余采样计算的叠加方波电压式转子接地保护  

Injecting Square Wave Voltage Type Ground Fault Protection for Generator Rotor Based on Redundancy Sampling and Calculation

作　　者：李哲[1] 卢俊[1] 仇新宏[1] 季学军[1] 刘宏博[1] 王煜[1] 

机构地区：[1]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》2010年第19期105-107,共3页Automation of Electric Power Systems

摘　　要：采样回路故障是引起转子一点接地保护误动的重要原因之一。为解决此问题,提出了一种采用双重采样回路和2种算法进行判断的转子接地保护方法。该方法利用不同采样数据的2种算法分别计算发电机转子接地电阻值,当2个计算电阻值都小于转子一点接地保护整定值时,才判为转子一点接地故障,从而提高了发电机转子一点接地保护的可靠性。通过这一方法,可以有效防止由于采样回路故障而引起的转子一点接地保护的误动作。Sampling circuit fault is one of the important reasons for causing rotor ground fault protection misoperation. To solve this problem,a method by double sampling circuit and two algorithms to judge the rotor ground fault protection is proposed. This method uses different sampling data and two algorithms to calculate the rotor ground resistor values separately. When all of the two calculated resistor values are less than the setting value of the one-point ground fault protection,it is judged that one-point ground fault for generator rotor is occurred. By this method,the reliability of the one-point ground fault protection is increased,and the rotor ground fault protection misoperation caused by sample circuit fault can be effectively prevented.

关 键 词：转子接地保护 冗余采样 冗余计算 叠加方波电压 

分 类 号：TM772[电气工程—电力系统及自动化]