对脉冲电源系统72 h老练实验过程中高压电缆座打火并被击穿情况进行分析,建立高压电缆终端电场分布等效电路,推导出从电缆终端到金属屏蔽层的电势差公式,从理论上分析高压座被击穿的原因是电缆终端绝缘层未做倒角,空间电荷在此处集聚、温度升高导致的。通过定位被击穿高压座击穿孔的位置验证理论分析的正确性,最后提出高压电缆端部绝缘层处理方法,并做72 h老练实验验证了其正确性。

By observing and analyzing the sparking and breaking down of the high-voltage cable socket of the pulsed power supply during the 72 hours conditioning experiment, the electrical field distribution equivalent circuit of the terminal of the high-voltage cable was built, the formula of the potential difference from the cable-terminal to the metal shielding layer was conducted. The reason of breakdown is analyzed theoretically in this paper. It is suggested that the un-chamfered insulation of the cable-terminal causes space charge focusing, which then results in a temperature increase leading to the high-voltage cable socket breakdown. The theoretical analysis is proved by the position of the breakdown hole of the high-voltage cable socket. The handling method of insulation of the cable terminal is presented, which was validated by continuous conditioning experiment for 72 hours.