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Experimental Investigation of Self-healing Properties of Metalized Film Capacitors

机译:金属化薄膜电容器自愈合性能的实验研究

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The self-healing performance of metalized film capacitors is studied by building a repeated charging and discharging setup and a self-healing signal testing setup. The charging and discharging setup imitates the working condition of the metalized film capacitor. The process is repeated until the lifetime of the capacitor came to an end. During the experiment, the self-healing signal was detected and counted at the same time, which was achieved by building a self-healing signal detection setup. The self-healing signal detection setup was used to achieve the acquisition of self-healing waveforms and amplitudes and the number of self-healing signals. In the research, it was found that only the capacitance changed monotonously. The waveform of self-healing discharge has a certain regularity. In the initial stage of the aging test, the waveform is relatively regular, but when the aging test continues to approach the end of the capacitor's lifetime, the waveform is distorted, and the cause of the distortion is analyzed. When the performance of the capacitor continues to deteriorate, the frequency of self-healing discharges also begins to become more frequent, and the amplitude increases. Besides, by dissecting the capacitor, it can be found that the self-healing discharge point is mainly located at the margin. That means the field strength distribution at this place needs to be optimized.
机译:通过建立重复的充电和放电设置和自修复信号测试设置来研究金属化薄膜电容器的自愈性能。充电和放电设置模仿金属化薄膜电容器的工作状态。重复该过程,直到电容器的寿命结束。在实验期间,通过构建自愈合信号检测设置来检测和计算自愈信号并计数。自修复信号检测设置用于实现自愈波形和振幅的获取和自我修复信号的数量。在研究中,发现只有电容只会单调变化。自我愈合放电的波形具有一定的规律性。在老化测试的初始阶段,波形是相对规律的,但是当老化测试继续接近电容器的寿命的末端时,波形扭曲,并且分析了失真的原因。当电容器的性能继续劣化时,自愈合放电的频率也开始变得更频繁,并且幅度增加。此外,通过解剖电容器,可以发现自愈合放电点主要位于边距。这意味着需要优化该地方的场强分布。

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