电路引用Partial discharge severity diagnosis and assessment a case of high-voltage electrode defect in GIS.pdfVIP

Partial Discharge Severity Diagnosis and Assessment: A Case of High-Voltage El ectrode Defect in GIS Bo Qi, Chengrong Li, Bibo Geng, Zhen Hao Jinxiang Chen, Hao You, Yihong Lin Beijing Key Laboratory of High Voltage EMC Fujian Electric Power Test and Research Institute North China Electric Power University Fuzhou, P. R. China Beijing, P. R. China Abstract—A major cause of insulation failure in GIS GIS is a dielectric complex with the application of both equipments is due to the high-voltage electrode defect, which solid and gas insulations. Discharge usually takes place usually occurs at the interface formed by metallic conductor, around the Cathode Triple Junction (CTJ), where the high insulator and SF6. The present research is designed to diagnose voltage electrode, SF6 and insulation surface meet. For the and assess the severity levels of the partial discharge (PD) convenience of the description, this category of faults is provoked by high-voltage electrode defect on GIS insulator referred hereafter as high-voltage electrode defects. A large surface. With the application of gradually increased voltage, number of researches have been conducted in recent years to long term tests were conducted on a well-established 252 kV GIS study the surface discharge caused by both immobilized experiment platform to observe the entire evolution process of metallic particles and free metallic particles.