“三结合点”对绝缘子沿面冲击闪络电压的影响

Influence Of The Triple Junction Points For On The Impact Flashover Voltage Along Insulators Surface

在气体间隙引入固体绝缘介质的组合绝缘结构中,电极-气体-固体介质"三结合点"周边发生的电场畸变,在较低电压下就会发生电极边缘气隙中的局部气体电离,引起沿固体介质表面的沿面闪络,降低气隙放电电压。采用外屏蔽槽结构的电极,能够降低"三结合点"电场强度,减少沿面闪络发生概率,有效提升间隙放电电压。

In a combined insulation structure in which a solid insulating medium is introduced into a gas gap,the electric field distortion occurring around the ＂triple junction points＂of the electrode-gas-solid medium causes local gas ionization in the edge air gap of the electrode at a lower voltage,causing flashing across the surface of the solid medium reduces the air gap discharge voltage. The electrode with the outer shielding groove structure can reduce the electric field strength of the＂triple junction points＂,reduce the occurrence probability of flashover on the surface,and effectively increase the gap discharge voltage.