基于超声波诊断的GlS设备异常分析方法

摘要

To improve on-site detection efficiency of partial discharge of gas insulated switchgear (GIS), a study is made in this paper on the analytical methods of GIS fault based on ultrasonic diagnosis. According to plenty of data collected on site, the time domain and phase distribution features of ultrasonic signals of typical GIS partial discharge are analyzed, and the differences in time domain features and frequency domain distribution between partial discharge signals and mechanical vibration signals are identified. The paper also studies the application of the joint ultrasonic and electromagnetic wave localization method, the ultrasonic time-delay localization method, and the ultrasonic wavelet time-frequency localization method in on-site GIS partial discharge detection. The detecting results indicate that the proposed methods are reliable in accuracy and correctness.%为提升气体绝缘组合电器(GIS)局部放电现场检测水平,对基于超声波诊断的GIS异常分析方法进行了研究.根据现场检测搜集的大量数据,总结出典型GIS局部放电的超声波信号时域和相位分布特征,并且分析了局部放电信号和常见干扰信号在时域特征和频域分布上的差异.研究了声电联合定位方法、超声波时延定位方法和超声波小波时频定位方法在GIS现场局部放电检测中的应用,检测结果表明这个方法具有较高的定位精度和准确性.