Discharge location technology in handover test of UHV GIS

Discharge location is an important issue and technical guarantee for AC withstand voltage test which is the key test in the handover test of extra-high voltage (UHV) equipment. In order to ensure the smoothly processing of the equipment defect inspection as well as the elimination of hidden fault, the discharge location technique in AC withstand voltage test of 1100kV Gas insulated metal-enclosed switchgear (GIS) is studied in this paper. Firstly, the process of UHV withstand voltage test is introduced. Then concerning the characteristics of the discharge in the withstand voltage test, the feature and applicability of the existing discharge location method is analyzed. A technique for accurate discharge location by considering comprehensive multi information is proposed. Finally, an actual discharge location cases is discussed, which proves that the location based on the signal strength and the oscillation duration has good accuracy. Since summary and analysis of UHV on field case is an important experience and reference source, this research provides some reference to the subsequent UHV project construction and the equipment manufacturers.