Research on Partial Discharge Localization in 252kV GIS Using Ultrasonic Associated with Electromagnetic Wave Method

According to a live detection of 252kV GIS, this paper describes the principles and technical advantages of UHF-based and ultrasonic-based GIS partial discharge detection methods; in addition, it analyzes the spectrogram information of portable PD analyzer to preliminarily judge the defect type. At last, the discharge source is precisely located by means of time difference positioning method and ultrasonic associated with electromagnetic wave method. Through the on-site basin-type insulator fastening screw inspection, the judgment is consistent with the test conclusion, which verifies the accuracy of the onsite live detection. Practice shows that UHF and ultrasonic partial discharge detection technique can recognize partial discharge due to GIS defects, and timely discover and prevent GIS insulation faults to ensure the operation security and stability of GIS.