基于电流脉冲等效时频分布的干扰及多源局部放电信号分离技术

Interference and Multi-Source Partial Discharge Signal Separation Technology Based on Equivalent Time-Frequency Distribution of Current Pulse

实施局部放电在线监测可在故障前及时发现电力设备绝缘缺陷,是确保各类电力设备及整个电力系统安全稳定运行的重要手段。然而,现场各类干扰及多源放电严重影响局部放电检测的准确度,进而影响后期故障类型识别及设备危险度评估。介绍了基于电流脉冲等效时间-等效频率分布的信号分离技术,根据干扰或不同放电类型的脉冲信号不同的等效时频图谱,可快速准确地实现放电信号和干扰及多源局部放电信号的分离。

The implementation of partial discharge online monitoring can detect insulation defects of power equipment in time before failure,and is an important means to ensure the safe and stable operation of various power equipment and the entire power system.However,various interferences and multi-source discharges on site seriously affect the accuracy of partial discharge detection,which in turn affects the identification of later fault types and the assessment of equipment risk.The signal separation technology based on the current pulse equivalent time-equivalent frequency distribution is introduced.According to the different equivalent time-frequency patterns of the pulse signals of the interference or different discharge types,the separation of the discharge signal from the interference and the multi-source partial discharge signal can be realized quickly and accurately.