通过在硅橡胶绝缘材料上施加交直流电压，研究工频交流电压叠加在直流电压上时对绝缘间隙的局部放电幅值与重复率的影响。结果表明：当交流电压纹波振幅低于其局部放电终止电压时，相比没有叠加交流纹波的直流电压，其大放电脉冲的数量增加，而重复率则远低于交流电压频率。
Silicone rubber insulation materials were applied AC and DC voltage together, and the influ-ence of AC and DC voltage superposition on the partial discharge magnitude and repetition rate of insula-tion air gap was studied. The results indicate that when the AC voltage ripple is below the partial dis-charge extinction voltage, compared with the condition aplied DC voltage with no AC voltage ripple, the number of big discharge pulses increase, and the dischage repetition rate is much lower than the frequen-cy of AC voltage.
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