Abstract: Transmission line and equipment corona of transformer station can be used to locate defect and analyze real situation of insulation. A UV imager based on solar blind filter and MCP detector was described in this paper. This instrument worked with visible light video camera in same visual field. It realized high sensitivity detection and location for corona. In order to test the performance of UV imaging detection, high voltage point discharge equipment was used to do experiments of different discharge intensities and on-site corona discharge detection. Results showed that the developed UV corona imager could be applied in detecting high voltage corona and locating fault.

Key words: solar blind UV imaging corona fault detection