基于无功相对偏差的无刷励磁发电机转子绕组匝间短路故障诊断新判据

摘要

In order to find a new method to the on-line identification of inter turn short-circuit fault of brushless excitation synchronous generator rotor,the change of electromagnetic properties was analysed and electrical parameters after the synchronous generator rotor windings occurred inter turn short-circuit.According to the characteristic that the exciting current was increasing and the reactive power output was decreasing relatively,a method was put forward which uses generator reactive power output relative change rate which was calculated or measured before and after the fault as a practical criterion for identification of the severity of brushless excitation synchronous generator rotor windings inter turn short-circuit fault.Finally,the relative experiment was carried out using the dynamic analog experiment unit.%为了寻找到在线识别无刷励磁同步发电机转子匝间短路故障的新方法,通过对同步发电机发生转子绕组匝间短路后电磁特性和电气参量的变化进行分析,根据故障发生后励磁电流增加而无功输出量却相对减少的特征,提出了利用计算和测量故障前后发电机输出无功相对变化率,作为识别无刷励磁同步发电机转子匝间短路故障严重程度的一个较为实用的方法.利用发电机动态模拟试验机组,进行了相关的试验验证.