基于I_(0)和3U_(0)突变量启动的发变组离相封闭母线绝缘缺陷分析

Analysis of Insulation Defects of Generator-Transformer Group Separate-phase Sealing Bus Based on I_(0) and 3U_(0) Abrupt Change Startup

某发电厂发电组故障录波屏中2号发电机中性点I_(0)突然出现突变量启动,并伴随发电机机端3U_(0)波形同步突变的现象。针对该发电机中性点I_(0)和3U_(0)突变的原因做出了缺陷判断,并通过停机检修确定了引起突变量产生的根本原因。最后,结合缺陷处理经验,提出做好发变组系统绝缘监视的参考建议。

in the fault recording screen of a power plant,the I_(0) at the neutral point of No.2 Generator suddenly starts up,accompanied by the synchronous sudden change of 3U_(0) waveform at the generator end.According to the cause of I_(0) and 3U_(0) sudden change of the generator neutral point,the defect judgment was made,and the root cause of the sudden change was determined through shutdown for maintenance.Finally,combined with the experience of defect treatment,puts forward some suggestions for insulation monitoring of generator transformer unit system.