一起开关柜局部放电缺陷声电联合分析

Acousto-electric Analysis of a Case of Partial Discharge Defect Encountered by an Actual Switchgear

针对一起10 kV开关柜局部放电检测数据超标的情况,对超声波局部放电检测波形开展了PRPS及PRPD图谱特征分析,初步判断局部放电缺陷的类型。通过暂态地电波最大值发生位置进一步判断缺陷可能发生的位置。最终通过停电检查确认局部放电缺陷是开关柜后柜门支柱绝缘子选型不合理所致。

This paper reports a case of data over-threshold of partial discharge detection encountered by an actual 10 kV switchgear.It describes analysis performed for identifying the defect,including PRPS and PRPD spectroscopy for the ultrasonic wave to determine the defect type,and calculation of possible location of the defect from the position of the maximum transient ground wave.Finally,it was confirmed through outage inspection that the defect of local discharge is caused by improper type selection of post insulator of switchgear back door.