1100 kV GIS现场交流耐压试验放电定位技术研究

Study on discharge location technology for 1100 kV GIS field AC withstand voltage test

在1100 kV GIS设备现场交流耐压试验中,放电定位是其中的一项关键问题和技术保证。为确保设备缺陷检查、处理以及故障隐患排除的顺利进行,针对1100 kV GIS交流耐压试验中放电的定位技术展开研究。首先介绍了特高压交流耐压试验流程。随后结合耐压试验放电的特性,对现有放电定位方法的特点及适用性进行了分析。结合放电定位的实际案例,提出了综合多方信息对放电位置进行准确定位的方法。最后对超声检测信号所包含的信息进行了讨论,证实了依据信号强弱和震荡持续时间进行定位具有较高的准确度。研究内容为后续特高压工程建设以及设备厂家提供了一定参考。

Discharge location is a key issue and technical guarantee for field AC withstand voltage test of 1100 kV Gas Insulated Metal-enclosed Switchgear（GIS）. In order to ensure the smooth processing of equipment defect inspection as well as the elimination of hidden fault, the discharge location technique for AC withstand voltage test of 1100 kV GIS is studied in this research. Firstly, the process of Ultra-High Voltage（UHV） withstand voltage test is introduced. Then concerning the characteristics of the discharge in the withstand voltage test, the feature and applicability of the existing discharge location methods are analyzed. A technique for accurate discharge location by considering comprehensive multi-information is proposed according to the actual location cases. Finally, the information contained in the ultrasonic detection signal is discussed emphatically, which proves that the location based on the signal strength and the oscillation duration has higher accuracy. This research provides some reference to the subsequent UHV project construction and the equipment manufacturers.