Abstract：The article introduces a case of analyzing and processing abnormal ultrasonic signals in the busbar air chamber of a 330kV gas insulated switchgear (GIS). By locating the amplitude and changing the operating status of the equipment, it is determined that the defect comes from the busbar chamber on the main transformer side. By analyzing the scatter plot and phase amplitude plot of the partial discharge ultrasonic signal, it is believed that the discharge of metal foreign objects at the bottom of the gas chamber is the main cause of the abnormal ultrasonic signal. After inspection of the manhole, it is found that there is a silver white metal sharp substance at the measuring point on the bottom of the tank body, which is generated during the production. This GIS busbar air chamber discharge is a typical case of metal tip discharge treatment, providing reference for the treatment of similar abnormal defects in the future.
黎宏飞, 高宗宝, 张靖, 马亚光. 一起330kV气体绝缘金属封闭开关设备金属毛刺放电缺陷分析与处理[J]. 电气技术, 2025, 26(3): 65-69.
LI Hongfei, GAO Zongbao, ZHANG Jing, MA Yaguang. Analysis and treatment of metal burr discharge defects in a 330kV gas insulated switchgear. Electrical Engineering, 2025, 26(3): 65-69.
2025, Vol. 26 
