Diagnosis and Analysis of Wall Bushing Typical Partial Discharge Fault in Switchgear

There are many reasons for the partial discharge in switchgear, so to achieve the safety and reliability operation of switchgear is more important. The internal partial discharge of wall bushing in switchgear are researched by employing the transient earth voltage detection method, ultrasonic detection method and ultra high frequency detection method based on the partial discharge case. Based on the related testing data, the amplitude, type and reason of partial discharge are discussed, and the location of partial discharge are accomplished by using the method of the acoustic-electric location method. The signal of partial discharge of wall bushing disappears after the treatment. The study shows that it can provide a reference basis for the practical measurement and accurate location for the internal partial discharge fault of wall bushing in the switchgear.