Abstract：When high voltage electrical equipment is subject to overvoltage attack, the insulation will be stressed by AC and overvoltage at the same time, which seriously threatens the reliability of equipment operation. Considering the actual engineering operation, this paper designed a set of AC and impulse superimposed voltage test system with fully controllable superposition phase, and studied the surface partial discharge characteristics in SF6 gas under AC and standard switching impulse voltage. When the AC voltage is 90% and 110% of partial discharge inception voltage (PDIV) of the test sample respectively, the switching impulse with amplitude of about twice of PDIV was superimposed on different phases of AC voltage. The phase of impulse superposition was changed from 0° to 360° with a step size of 45°. The test results show that the phase of impulse superposition has a significant effect on the AC surface partial discharge. When the impulse is superimposed from 45° to 135° of AC voltage, partial discharge (PD) under the AC voltage is excited or enhanced after impulse, but there is no influence on the AC PD activities when the impulse is superimposed on other phase. The effect of the impulse on the AC PD activities has a significant polarity effect, the AC PD is only excited or enhanced in the negative half cycle of AC voltage after impulse, but there is no obvious effect on PD in the positive half cycle. The effect of impulse on AC PD activities is related to the amplitude of AC voltage. The higher the amplitude of AC voltage, the greater the amplitude and number of PD excited by impulse when the same phase is superimposed.
何聪, 张芊, 曹铎耀, 袁文泽, 李军浩. 交流与操作冲击叠加电压下SF6气体中沿面局部放电特性[J]. 电工技术学报, 2020, 35(8): 1807-1817.
He Cong, Zhang Qian, Cao Duoyao, Yuan Wenze, Li Junhao. Surface Partial Discharge Characteristics in SF6 under AC and Switching Impulse Superimposed Voltage. Transactions of China Electrotechnical Society, 2020, 35(8): 1807-1817.
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2020, Vol. 35 
