GIS局部放电信号处理

采用非接触方法,利用双锥天线检测从气体绝缘变电站(GIS)内部泄漏出来的电磁波信号,并进行处理,以判断其内部是否发生放电。针对现场强烈干扰带来的小信号检测问题,提出局部放电信号背景噪声直接滤除法。该方法通过对背景信号进行分析,找出其中较大的干扰频率分量,并将其直接从放电信号中滤除。试验证明,通过适当的参数选取,该方法能取得很好的滤波效果。

Signal Processing of Partial Discharge Detection for GIS

This paper adopted a non-contact method to detect the electromagnetic wave leaked from inside of a Gas Insulated Station(GIS) using biconical antennas and processed it to judge whether there happened discharge inside the GIS.Also it put forward a method to directly filter background noises from partial discharge signals aiming at the small signal detection problems brought from the strong disturbance in field.The method found out the bigger frequency component of the disturbance through analysis of background signals and filtered it directly from the discharge signals.Tests show that the method can achieve good filtering effect by means of proper parameter selections.