配网开关柜的超声波局部放电和暂态地电压联合分析方法

Ultrasonic Partial Discharge and Transient Ground Voltage Combined Analysis Method for Distribution Network Switch Cabinet

10 kV配网开关柜作为配网系统的中转站,是供电系统的重要环节,因此需保证开关柜安全运行。问题开关柜会引发局部放电问题,初期不易被发现,因此需采取有效的检测手段得出数据,并对数据进行分析,准确判断故障。主要给出超声波和暂态地电压联合分析方法在10 kV配网开关柜局部放电带电中的应用,并结合某地区典型案例,利用该方法分析判断局部放电可能性,证实了联合分析方法的实用价值。

As to the relay station of the distribution network system,10 kV distribution network switch cabinet is an important link of the power supply system.Therefore it is necessary to ensure the safe operation of the switch cabinet.The compromised switch cabinet will cause partial discharge problem which is hardly detectable in the initial stage.Therefore,it is necessary to adopt effective detection methods to obtain data for analysis and diagnose the health state of the cabinet.In this paper,the application of ultrasonic wave and transient ground voltage(TEV)combined analysis method in the partial discharge live of 10 kV distribution network switch cabinet is presented.Based on a typical case,the method is used to analyze and judge the possibility of local discharge,which proves the practical value of the combined analysis method.