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中文摘要：
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。
英文摘要：
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.
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