关于电流互感器角比差分析的探讨

Discussion on Analysis of Angular Ratio Difference of Current Transformers

某500 kV变电站#2联变及三侧开关例检期间,作业人员发现5032开关电流互感器C相4个绕组的绕组对地及绕组间二次绝缘均小于1 MΩ,开盖后发现密封圈有破损,进水情况严重。作业人员紧急联系厂家技术人员协同恢复绝缘处理,重新测量绝缘合格后送电。

During regular examination of a 500 kV substation#2 transformer and three-side circuit breaker,operators found that the winding to ground and the secondary insulation between the four C-phase windings of the 5032 switching current transformer were less than 1 MΩ.After opening the cover,it was found that the sealing ring was damaged and the inside was damp seriously.The operator contacted the technical personnel of the manufacturer to restore the insulation.After the treatment was qualified and the insulation was qualified by re-measurement,the transmission was recovered.