故障高压绝缘子泄漏电信号在线检测技术研究

分析了高压绝缘子故障发生的机理,针对故障绝缘子绝缘水平下降会导致漏电脉冲信号幅度和频谱均发生变化的现象,设计和制造了通过在绝缘子承载铁塔接地线上检测电晕漏电脉冲信号的高速数据采集系统.采用Matlab所提供的一维离散小波分析工具软件,对所采集的漏电数据信号实现小波变换分析.从各种不同正常和故障绝缘子组合所检测到的数据分析结果可以明显看出,有故障绝缘子存在时,所采集的漏电脉冲信号幅度和频谱均发生了明显的变化.

Study about online discriminating fault insulator through measurement of the leakage current signal

The damage mechanism of fault insulator i s analyzed. When the insulation level of insulator degrades, the leakage current increases and some change in the amplitude and frequency spectrum of leakage current pulse signal occurs. According to this phenomenon, a high rate data acquisition system for the measurement of leakage current pulse signal is designed. To use the software wavelet 1-D in Matlab toolbox these acquired data were analyzed. Through combining various normal insulators and fault insulators, the different measured data were captured. Wavelet transform analysis results about these data files show that the signal amplitude and frequency spectrum are obviously different.