几种500kV GIS局部放电检测方法的应用比较

Application Comparison of Partial Discharge Detection Methods for 500 kV GIS

分析了超声波、超高频以及SF_6气体分解物组份分析3种在线检测方法的原理及特点。搭建了GIS局放检测模拟试验平台,模拟设置4种GIS内部绝缘缺陷,运用这3种检测方法进行检测并对检测频谱图分析,得出500 kV某变电站局放在线检测装置误报漏报的原因。利用超声波传感器、超高频传感器和气体传感器(SF_6气体分解物组份检测)能够接收现场不同类型局部放电信号这一特点,提出基于3种不同类型传感器信息融合的在线检测方法,以解决GIS局放在线监测装置存在的问题。

This paper analyses the principle and features of three on-line detecting methods of ultrasonic,ultrahigh frequency, SF6 discharge breakdown products. A test platform is built and four internal insulation faults of GIS are simulated for detection through the three ways and analysis via spectrogram. The reason why the on-line detecting device misreports or fails to report on a 500 kV substation partial discharge is detected. Finally,based on the feature that the ultrasound sensor,ultrahigh frequency sensor and gas sensor （SF6 dis-charge breakdown product detection） can receive different types of field partial discharge signals,an on-line detecting method that combines information from the three different types of sensors is proposed to solve the problems existing in current GIS online partial discharge monitoring device.