Tesla型脉冲功率源主开关绝缘恢复特性
Insulation recovery switch for Tesla-type generator of nitrogen spark gap
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摘要: 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。Abstract: 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
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Key words:
- spark gap switch /
- self-breakdown /
- repetition rate /
- insulation recovery /
- two-pulse circuit /
- tesla transformer
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