重复脉冲占空比对变频电机绝缘局部放电统计特性的影响

发布时间：2018-06-07 13:08

本文选题：变频电机 + 局部放电　；参考：《中国电机工程学报》2017年07期

【摘要】：研究脉冲电压参数对局部放电(partial discharge,PD)统计特性的影响规律,有利于I型变频电机绝缘性能评估时得到客观结论。该文采用漆包线单点试样,通过双极性脉冲电压下的大量实验,研究了占空比(0.005%~50%)对PD统计特性的影响规律,并根据脉冲电压下的局部放电机制分析了占空比对局部放电幅值和相位作用机制。研究表明:电压持续时间小于100μs时,局部放电发生概率较低,放电幅值较小,放电不对称,下降沿附近干扰信号严重,导致PD信号提取信噪比降低,影响了变频电机绝缘性能测试的准确性。当脉冲持续时间大于100μs时,PD统计特性基本对称。因此,根据相关标准进行变频电机绝缘检测时,宜采用持续时间超过100μs的重复脉冲电压。
[Abstract]:The study of the influence of pulse voltage parameters on the statistical characteristics of partial discharge (PDD) is beneficial to the objective conclusion when evaluating the insulation performance of type I variable-frequency motor. In this paper, the influence of duty cycle on the statistical characteristics of PD is studied by using single point sample of enamelled wire and a large number of experiments under bipolar pulse voltage. Based on the partial discharge mechanism of pulse voltage, the mechanism of partial discharge amplitude and phase is analyzed. The results show that when the voltage duration is less than 100 渭 s, the probability of partial discharge is lower, the discharge amplitude is smaller, the discharge is asymmetric, and the disturbance signal near the drop edge is serious, which results in the reduction of signal to noise ratio (SNR) of PD signal extraction. The accuracy of insulation performance test of variable-frequency motor is affected. When the pulse duration is more than 100 渭 s, the statistical characteristics of PD are basically symmetric. Therefore, the repetitive pulse voltage with a duration of more than 100 渭 s should be used for insulation detection of variable-frequency motor according to relevant standards.
【作者单位】：四川大学电气信息学院;
【分类号】：TM855

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