Development and on-site application of UHF PD detection system to estimate the insulator condition of MV switchgear

Defects in the SF
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medium voltage (MV) switchgear can result in failure. Therefore it is important to detect defects, such as protrusions and particle, in time and to determine their risk for a possible breakdown. For high voltage apparatus, the ultrahigh frequency (UHF) partial discharge (PD) detection technology has proven to be a sensitive method. In this contribution the development of UHF PD detection system for the MV switchgear and its application are described. Experimental studies show that the PD detection of the MV switchgear defects is possible.