UHF局放检测技术在GIS故障诊断中应用与分析

Application and Analysis of UHF Partial Discharge Detection Technology in GIS Fault Diagnosis

GIS设备对电网的可靠运行有至关重要的影响,局部放电是引起GIS绝缘故障的主要原因,对GIS开展局放检测意义重大。特高频检测方法由于抗干扰能力强及灵敏度高得到广泛应用。文章系统介绍了特高频检测技术的原理、类型识别、定位及现场去噪方法。通过对广东电网某开关站的局放案例进行缺陷分析,详细介绍了特高频检测技术在现场中的应用,并通过试验验证了UHF技术的检测效果。最后对GIS局放检测技术在电网现场的应用作了指导性总结。

GIS plays an important role on the reliable operation of the power grid,and partial discharge is the main cause of insulation faults in GIS.Therefore,it is of great significance for GIS to carry out partial discharge （PD） detection.The Ultra high frequency （UHF） detection technology is widely used because of its strong anti-interference ability and high sensitivity.This paper systematically introduces the principle,type identification,positioning and on-site de-noising methods of the UHF detection technology.On this basis,through the defect analysis of the PD case of a switch station in Guangdong Power Grid,the application of UHF detection technology in the field is introduced in detail,and the detection effect of UHF technology is verified by experiments.Finally,the application of GIS PD detection technology in the field is summarized.