SF6绝缘电流互感器放电性缺陷带电检测方法的分析

SF6绝缘电流互感器的常规试验项目很少,难以诊断出内部的放电性缺陷.文中分析了SF6绝缘电流互感器放电性缺陷产生的原因,介绍了带电检测其放电性缺陷的方法和原理.结合一起SF6绝缘电流互感器的放电性故障,分析了超声波局部放电检测法和SF6气体成分分析法的特点:超声波局部放电检测法可以通过对比正常相和故障相的局部放电图谱,...

Analysis on Two Live Detection Methods of Discharge Fault in SF6 Current Transformer

Normal test items for SF6 current transformers are insufficient for diagnosing internal discharge fault in this kind of transformers.This paper analyzes the causes of discharge fault in SF6 current transformers,and introduces two alive detection methods of discharge and their principles.Taking a discharge fault in a SF6 current transformer for example,the features of the ultrasonic partial discharge detection method and the SF6 gas component analysis method are analyzed.The result shows that the former method can be used for preliminary determination of discharge fault through contrasting the discharge waveforms of normal phase and fault phase,and the latter one can be employed to determine the degree of discharge in the transformer according to diagnostic gas contents.