Non-contact Discharge Detection System for High Voltage Equipment Based on Solar-Blind Ultraviolet Photomultiplier

Optical radiation is a very important character signal of high-voltage equipments surface discharge, and it can be used to characterize the equipment insulation condition, but usually, the equipment surface discharge is very weak, and the light signal mainly distributes below 400 nm ultraviolet (UV) band. To detect the solar-blind band UV signal, it can not only help us to find the early discharge, but also to detect the discharge in the daytime. In this paper, a discharge UV pulse detection system was designed, first, the detection principle is introduced, then the key hardware and software parts are introduced in detail, and finally it is tested in laboratory. Experiment shows that this system has the characters of long detection distance, high-sensitivity, and can effectively find the surface discharge. So it provides a new non-contact method to inspect the discharge phenomenal of high-voltage equipment.