The urgent need for the safer operation of inverter-fed motors is leading research to the qualification tests under high frequency rectangular wave voltages. Consequently, the generation of rectangular wave voltages with adjustable parameters has become a major concern for manufacturers and researchers. This article presents a design of high frequency and high voltage pulse generator able to provide unipolar or bipolar pulses up to 20 kV peak-to-peak with variable rise and fall time that can be tuned down to 40 ns. Such a generator is performant enough for testing a large part of motors following standards and with more stressful conditions for research of new winding technologies. Resorting to high voltage push–pull solid-state switches and dielectrics liquid and air-cooling technique, the tested capacitance load can reach up to 3000 pF. Also, the overcurrent protection circuit is carefully designed and verified by using real-time logic control hardware. The proposed generator has been successfully used for endurance tests and partial discharge inception voltage (PDIV) detection at repetitive impulsive voltages for capacitive, inductive insulation structures, and windings during the qualification evaluation of inverter-fed motors.

中文翻译：

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用于评估变频电机绝缘的矩形波高压发生器的设计

对变频电机更安全运行的迫切需求正在引领对高频矩形波电压下资格测试的研究。因此，参数可调的矩形波电压的产生成为制造商和研究人员的主要关注点。本文介绍了一种高频和高压脉冲发生器的设计，能够提供高达 20 kV 峰峰值的单极或双极脉冲，可变上升和下降时间可调低至 40 ns。这种发电机的性能足以按照标准测试大部分电机，并且在新绕组技术的研究中具有更高的压力条件。借助高压推挽式固态开关和电介质液体和空气冷却技术，测试的电容负载可达 3000 pF。还，过流保护电路经过精心设计和验证，采用实时逻辑控制硬件。所提出的发电机已成功用于在变频电机的资格评估期间对电容性、电感性绝缘结构和绕组的重复脉冲电压下的耐久性测试和局部放电起始电压 (PDIV) 检测。