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In view of the shortcomings of the current conventional technical means for partial discharge monitoring of high-voltage switchgear, an on-line partial discharge monitoring system considering the design principle of installation inside the switchgear is proposed on the basis of the combined transient earth voltage and ultrasonic monitoring technology, and has been put into use in a 110kV substation. The technology has the advantages of direct data collection in the cabinet, small interference of the data signal by the environmental background, high monitoring process efficiency and strong data comparability. By comparing the partial discharge monitoring results of various defect model and the monitoring results in the normal operation state of the switchgear, it is found that the system has good diagnostic ability for the above types of partial discharge defects and has good field application prospects.
Yuan et al. (Mon,) studied this question.