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发明授权
CN104991171B 基于超高频信号的GIS局部放电分频故障图谱绘制方法 有权 转让

基于超高频信号的GIS局部放电分频故障图谱绘制方法
摘要：
本发明公开了一种基于超高频信号的GIS局部放电分频故障图谱绘制方法，包括：同步获取GIS局部放电信号xp和外界干扰信号xn；对xp进行自适应滤波；对滤波后的GIS局部放电信号自适应选取起始有效频点和结束有效频点，并按照设定的频点间隔得到有效频点序列fj；每200us计算一次各有效频点fj处的放电量和放电相位；统计1秒内每个有效频点fj处局部放电的放电相位、放电量及放电次数，并计算每个有效频点fj处的平均放电量、最大放电相位；绘制GIS局部放电分频故障图谱。本发明基于超高频信号的GIS局部放电分频故障图谱绘制方法，为GIS局部放电故障的检测与识别提供技术支持。
摘要（英）：

The present invention discloses a method for drawing a GIS partial discharge frequency division fault spectrogram based on an ultrahigh frequency signal, comprising the steps of: synchronously obtaining a GIS partial discharge signal x

and an external interference signal x; performing adaptive filtering for the GIS partial discharge signal x

; adaptively selecting a start effective frequency point and an end effective frequency point from the filtered GIS partial discharge signal, and obtaining an effective frequency point sequence f according to a given frequency point interval; calculating a discharge capacity and a discharge phase of each effective frequency point f every 200 [mu]s; performing statistics for the discharge phase, the discharge capacity and discharge number of partial discharge of each effective frequency point f within 1 second, and calculating an average discharge capacity and a maximum discharge phase of each effective frequency point f; and drawing a GIS partial discharge frequency division fault spectrogram. The method for drawing the GIS partial discharge frequency division fault spectrogram based on the ultrahigh frequency signal provided by the present invention provides technical support for detection and identification of GIS partial discharge faults.

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