Abstract: In the process of partial discharge detection of high voltage switchgear,the partial discharge detection accuracy of high-voltage switchgear is affected by the external electromagnetic interference in the working field of high voltage switchgear.Based on the development and research of partial discharge anti-interference system of switchgear,the reason of the formation of four partial discharge defect models of high voltage switchgear and their respective characteristics were analyzed.The advantages,disadvantages and principles of partial discharge defect model detection in switchgear were introduced.The experimental platform of anti-interference detection system for high voltage switchgear was set up.The dual-sensor based on TEV and receiving electromagnetic wave receiver developed by the experiment is validated to effectively inhibit the interference from the communication noise and the corona interference on the outer surface of the switchgear.It realizes the effective identification and separation of switchgear partial discharge and external disturbance.

Key words: partial discharge, electromagnetic interference, defect model, TEV sensor, electromagnetic wave receiver