Detection and analysis of typical fault partial discharge characteristics in switchgear

There exists many reasons for the partial discharge in switchgear such as the insulation defect, insulation aging, and bad contact and so on, so the judgment of partial discharge type is important for the evaluation of switchgear operation status. The types and causes of switchgear are analyzed, discuss the advantages and disadvantages of transient earth voltage detection method, ultrasonic detection method and ultra high frequency detection method. The applicability of different detection methods are summarized under the different insulation defects and partial discharge types according to the partial discharge detection data for the heavy duty area and pivotal substation. The location methods are analyzed for partial discharge source. Base on the four typical defects in switchgear, as for the employed detection method, the amplitude, types and reason of partial discharge are discussed. It can provide a practical application basis for condition based maintenance and technical guarantee for tester.