摘要
研究重复脉冲电压参数对变频电机绝缘局部放电起始电压(PDIV)的影响规律,有利于低压散绕电机的绝缘性能评估。本文搭建了重复脉冲及正弦电压下的局部放电测试系统,通过对双绞线施加不同电压波形,研究了重复脉冲极性及占空比(0.01%~70%)对I型变频电机匝间绝缘PDIV的影响规律及机理,分析了正弦与脉冲电压下PDIV测试等效条件。结果表明:占空比为50%时,脉冲电压双极性下试样PDIV约低于单极性下PDIV的12%;随着脉冲占空比的增加,单极性下PDIV值逐渐升高,双极性下PDIV变化较小,但呈现先增加后减小的趋势;当单极性脉冲占空比为10%以下,双极性脉冲占空比为30%~70%时,与正弦电压下PDIV测试值最接近。对此,采用脉冲电压测试电机绝缘PDIV时,需考虑占空比的选取;且在一定电压参数下,正弦与脉冲电压PDIV测试基本等效。
Knowing the influence of repetitive pulse voltage parameters on the partial discharge inception voltage(PDIV)of the inverter motor insulation is conducive to evaluate insulation performance of low-voltage random-wound motors.In this paper,partial discharge test systems were built under repetitive pulses and sinusoidal voltages,and the effects of repetitive pulse polarity and duty cycle(0.01%~70%)on the PDIV of I-type inverter-fed motors turn to turn insulation were studied on the basis of twisted-pair wires under different voltage waveforms,as well as the equivalent conditions of the PDIV test were researched under sine and pulse voltages.The results show that,when the duty cycle is 50%,the bipolar pulse voltage is 12 percent lower than the PDIV test value of the twisted pair under unipolar.With the increase of the pulse duty cycle,the PDIV value under unipolarity gradually increases,and the PDIV value under bipolarity changes little,but there is a trend of increasing first and then decreasing.When the unipolar pulse duty cycle is less than 10%,the bipolar pulse duty cycle is 30%~70%,and the PDIV test value under sinusoidal voltage is most close.Therefore,when using pulse voltage to test the PDIV of the motor insulation,the duty cycle should be considered,and the sine and pulse voltage can fundamentally be equivalent under certain voltage parameters.
作者
郭厚霖
王鹏
罗英露
李伟业
李想
GUO Hou-lin;WANG Peng;LUO Ying-lu;LI Wei-ye;LI Xiang(College of Electrical Engineering,Sichuan University,Chengdu 610065,China;Xiangyang CRRC Motor Technology Co.,Ltd.,Xiangyang 441047,China)
出处
《电工电能新技术》
CSCD
北大核心
2022年第7期38-48,共11页
Advanced Technology of Electrical Engineering and Energy
基金
国家自然科学基金项目(51977134)。
关键词
占空比
极性
局部放电起始电压
脉冲电压
双绞线
变频电机
duty cycle
polarity
partial discharge inception voltage
pulse voltage
twisted-pair wires
inverter-fed motor
