In order to achieve the safety and reliability operating of high voltage switchgear

the internal partial discharge of switchgear are researched by using the TEV

AE and UHF detection technology based on the partial discharge case. The location of partial discharge are accomplished by using the method of divide surface from the horizontal

vertical and depth in the space and the ultrahigh frequency devices. Base on the related testing data

the amplitude

types and reason of partial discharge are discussed

and it provide a practical application basis for detection and accurate location the internal partial discharge of switchgear.