A feasibility study on bushing tap UHF sensing method for partial discharge in transformer

Abstract

the paper proposes a new detection method for partial discharge in transformer. Different from conventional UHF method, which mainly detects electromagnetic wave motivated by discharge, the proposed method detects current pulse signal excited by discharge in UHF band from bushing tap grounding wire. An experiment is performed to study feasibility of the proposed method and to make a contrast with conventional UHF method. It is concluded that, though the sensitivity of proposed method is a little lower compared to internal antenna UHF method, it is still enough to detect partial discharge effectively, and the proposed method is easy to operate and out of problems such as seal which internal UHF method owns. The proposed method offers a relatively practical solution to on-site detection for partial discharge in transformer.