单端注入直流电压源的乒乓式转子接地保护在无刷励磁发电机中的运用

Application of Earthing Protection of Ping-pong Type Rator with One-end Voltage Injection in Brushless Excitation Generators

针对无刷励磁发电机转子绕组引出方式为固定引出转子的负端而无法运用乒乓式一点接地保护的问题,对乒乓式转子接地保护进行改进,提出采用单端注入直流电压源的乒乓式转子接地保护方式并给出改进的乒乓式转子接地保护方法。采用MATLAB/Simulink软件进行转子一点接地故障仿真模型试验,仿真结果表明,单端注入直流电压源的乒乓式转子接地保护能够满足无刷励磁发电机实际运行需要的精度和灵敏度。

The negative terminal of the rator is led in brushless excitation generators due to which pingpong type onepoint grounding protection can not be adopted, grounding protection of pingpong type rator is improved. The paper suggests using grounding protection of pingpong type rator with oneend voltage injection and brings forward improved grounding protec tion method. Matlab/Simulink is used for simulation test and the result shows that grounding protection of pingpong type rator with oneend voltage injection can meet the precision and sensitivity in practical operation of brushless excitation gener ators.