Due to the extreme operating conditions of high voltage rising rate, silicone gel materials used in the encapsulation insulation of power electronic devices are prone to insulation failure. In this paper, we proposed a mechanism of insulation degradation under the ultra-fast pulsed electric field by considering the synergistic effect of molecular vibrations and charge behaviors. With the quantum dynamic simulation, it is found that the motion of space charge will induce a strong local vibration of the surrounding molecules to produce phonons in addition to the normal thermal vibration. The steeper the edge time, the higher the amplitude of vibration. With assistance of phonons, a portion of charge is excited to a high-energy state, resulting in an increased probability of induced charge trapping and detrapping. This image well microcosmically confirms the phenomenon of molecular vibration and intensified electric tree formation under ultra-fast pulsed electric fields.

中文翻译：

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超快脉冲电场下分子振动和电荷行为对硅胶增强绝缘失效的协同影响

由于高升压率的极端工作条件，电力电子器件封装绝缘所使用的硅凝胶材料容易出现绝缘失效。在本文中，我们考虑分子振动和电荷行为的协同效应，提出了超快脉冲电场下绝缘劣化的机制。通过量子动力学模拟发现，空间电荷的运动除了正常的热振动外，还会引起周围分子强烈的局域振动，从而产生声子。边缘时间越陡，振动幅度越高。在声子的帮助下，一部分电荷被激发到高能态，导致感应电荷捕获和解捕获的可能性增加。该图像从微观上很好地证实了超快脉冲电场下分子振动和增强​​电树形成的现象。