高频电流脉冲法在抽水蓄能电站主变压器局部放电检测的应用

The Application of High Frequency Current Pulse Technique for Main Transformer Partial Discharge Detection in Pumped Storage Power Plant

为应对常规高频电流脉冲法在测量局部放电时存在干扰信号,而导致影响局部放电判断的问题,本文通过模糊分类理论,取得了区分高频信号中局部放电信号和干扰信号的良好效果。结合局部放电产生机理,分析了不同类型局部放电信号在相位幅值(PRPD)谱图上的分布特征,并应用于脉冲信号的局部放电判断。测量了某抽水蓄能电站多台主变压器在不同工况下接地系统的高频电流脉冲,展示了环境噪声信号、具有固定相位特征的非放电信号等多种信号的PRPD谱图脉冲分布,判断了某台主变压器可能存在外部沿面局部放电情况。

To avoid the noise and disturbances signal during Partial Discharge(PD)detection test used by high frequency current pulse technique,according to the fuzzy classification theory,PD signals and other signals can be separated and classified efficiently.Combining with the mechanism of PD occurrence,the distribution characteristics of different kind of PD on Phase Resolved Partial Discharge spectrum(PRPD)are highlighted.Additionally,with various operation modes,the ground current of main transformers in pumped storage power station can be measured,the environment chaos signal and the other discharge signals were exhibited.The analysis of a likely surface PD out the edge of one main transformer is discussed in this article.