基于时频检测的GIS设备异常振动分析

Analysis on Abnormal Vibration of GIS Based on Time-frequency Detection

摘要:

对振动信号进行时频分析可以准确地定位振动源，进而分析 GIS 设备异常振动的成因并评价设备运行状况。 采用振动宽频测试系统检测了某 220 kV 变电站 GIS 设备的异常状况，通过对测得振动信号进行频谱分析和连续小波 分析，研究了振动信号的时频特性，揭示了振动信号在 GIS 设备中的传播衰减过程; 同时利用振动信号小波熵分析了 振动信号的时间延迟，从而对振动源进行了精确定位。

Abstract:

The vibration source can be accurately located by the time － frequency analysis that can analyze the causes of abnormal vibration of GIS and evaluate the equipment operating conditions． The wideband vibration testing system is used to detect the abnormal vibration of 220 kV GIS equipment． By means of spectrum analysis and continuous wavelet analysis of the measured vibration signals，the time domain and frequency domain characteristics of the vibration signal are studied． The analysis results show1the propagation attenuation characteristics of the vibration signal on GIS． The time delay of vibration signal is obtained by the wavelet entropy，therefore the vibration source is accurately located．