高频方波脉冲下变频电机绞线对的局部放电特性分析  

Partial discharge characteristics of twisted pairs for inverter-fed motor under square impulse voltage

作　　者：徐慧慧[1] 吴广宁[1] 朱光亚[1] 罗杨[1] 曹开江[1] 张依强[1] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《电工电能新技术》2012年第4期48-51,57,共5页Advanced Technology of Electrical Engineering and Energy

基　　金：国家自然科学基金资助项目(51177136)

摘　　要：基于脉冲电流传感器建立了一套方波脉冲下的局部放电测试系统,并对模拟变频电机匝间绝缘的绞线对试样进行局部放电试验。测试并分析了脉冲电压的频率和上升时间对局部放电起始放电电压、平均放电量和放电次数的影响,探讨了绞线对在方波脉冲电压下的局部放电机理,为更深入地研究方波脉冲电压下绝缘老化机理打下了坚实的基础。Inverter-fed traction motor is one of the key components in electric locomotive for high-speed railway, of which insulation system reliability can guarantee the safety and stability of locomotive. Partial discharge （PD） is one of the most important factors causing previous failure of the insulation of inverter-fed motors. In this paper, a partial discharge testing system under square impulse voltage based on impulse current sensor was built. And PD tests were conducted on twisted pairs simulating inter-turn insulation of inverter-fed motor. The influence of voltage rise-time and frequency on PD inception voltage, average discharge quantity, and discharge numbers were analyzed. Mean- while this paper discussed the PD mechanism of the twisted pairs under square impulse voltage. This can provide more strong foundation for further studies on insulation ageing mechanism of square impulse voltage.

关 键 词：脉冲方波 局部放电 变频电机 绞线对 

分 类 号：TM835[电气工程—高电压与绝缘技术] TM245[一般工业技术—材料科学与工程]