The Development of Non-Intrusive Techniques for Partial Discharge Detection on MV and EHV Switchgear

There is a large population of ageing distribution plant and equipment installed on electricity companies´ networks and in many industrial and commercial locations. In order to achieve effective utilisation of these assets and make sound decisions on maintenance strategies, asset refurbishment or replacement, it is necessary to have reliable information on the condition of existing plant. The trend to extend maintenance periods and optimising the availability of switchgear brings with it a need for interim non-intrusive diagnostic techniques to give confidence in the continuing safety and reliability of the equipment. This paper will look at developments in equipment available for partial discharge testing of switchgear operating in the 3.3 kV-400 kV range