一起35 kV开关柜局部放电缺陷检测及分析

文中分析了一起35 kV开关柜局部放电缺陷案例,采用暂态地电压、超声波及特高频等多种局部放电带电检测技术进行分析诊断,利用电磁波时差法对局部放电源进行定位,结合开关柜内部结构给出局部放电源位置范围,停电检查发现A相避雷器引线与绝缘板间存在明显放电痕迹,验证了缺陷分析诊断及定位的正确性。结果表明,局部放电带电检测技术可以有效发现开关柜内绝缘缺陷,案例为类似开关柜缺陷处理提供经验。

Defect Detection and Analysis of Partial Discharge in 35 kV Switchgear Cabinet

A case of partial discharge defect in 35 kV switchgear cabinet is analyzed. The live detection technologies such as transient earth voltage , acoustic emission and ultra-high frequency is adopted to detect and analyze the defect, and the electromagnetic wave time difference method is used to locate the partial discharge source. Combined with the internal structure of switchgear cabinet, the location range of the partial discharge source is given. The obvious discharge trace between the lead of A-phase arrester and the insulation board is found during the power failure inspection, which verifies the correctness of the defect diagnosis and positioning result. The results show that the live detection technologies for partial discharge can effectively find insulation defects in switchgear cabinet, which provides experiences for similar defects treatment of switchgear cabinet.