以Tesla变压器作为脉冲功率源,采用双脉冲法,对4 mm间隙、4 MPa压强的氮气开关绝缘恢复特性进行了实验研究.实验开关电极材料为紫铜,形状为环形.结果表明:在开关放电结束后约0.3 ms内,开关几乎处于导通状态,属于火花通道去电离阶段；而后其绝缘恢复系数以指数曲线上升,直至约3 ms后完全恢复,属于气体温度恢复阶段.Tesla变压器使得高压氮气火花开关的绝缘恢复曲线分段特征更为明显,由于火花通道去电离前其电阻对变压器次级电容呈并联关系,对变压器次级充电有旁路作用.%Taking a Tesla transformer as a pulsed power source, the insulation recovery characteristics of a 4 mm-gap length, 4 Mpa-pressure N2 switch are researched with two-pulse method. The material of the switch is copper and the shape is circular. The results indicate that, the switch is almost conducting within about 0. 3 ms after the end of discharge, which belongs to the deionization stage; then the insulation recovery factor rises up exponentially until the switch recovers completely at about 3 ms, which belongs to the gas temperature recovering stage. The Tesla transformer makes the sectional characteristic of the insulation recovery curve of the high-voltage N2 spark switch more obvious. The reason may be that the resistance of the spark channels is paralleled with the secondary capacitance of the transformer before deionization, which plays a part of bypass to the charging of the secondary transformer.
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