Primary research on the operating characteristics of electrically triggered vacuum surface flashover switch
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摘要: 为研究电脉冲触发真空沿面闪络开关在中、小通流条件下的适用性，基于直接镀铜基板工艺制作了真空沿面闪络开关样件并搭建了开关工作特性测试实验平台。通过实验手段初步研究了开关耐压特性、触发工作特性（触发延时、抖动、工作范围）和寿命特性。实验结果表明：有效间隙7.2 mm的真空沿面闪络开关直流耐压约40 kV；开关在18 kV工作电压下触发导通延时89.9 ns，抖动13.1 ns，开关在1～18 kV工作电压范围内均能可靠触发导通；连续考核约2300次后开关各项特性无明显变化。Abstract: To study the applicability of the electrically triggered vacuum surface flashover switch under medium and small current, vacuum surface flashover switch samples based on direct plated copper technology are designed and fabricated, an experimental platform for testing the switch operating characteristics is established. The voltage hold-off characteristics, trigger characteristics and life characteristics of the switch are preliminarily studied. The results show that: the DC withstand voltage of the vacuum surface flashover switch with an effective gap distance of 7.2 mm is about 40 kV; the conduction delay is 89.9 ns and the jitter is 13.1 ns under the working voltage of 18 kV, and the switch can be reliably triggered in the range of 1 kV to 18 kV; no obvious change in the characteristics of the switch is observed after being triggered for about 2300 times.
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图 1 真空沿面闪络开关工作特性测试实验电路原理图
Figure 1. Circuit schematic for vacuum surface flashover switch test platform
图 3 真空沿面闪络开关直流耐压特性
Figure 3. DC voltage hold-off characteristic of vacuum surface flashover switch
图 5 开关延迟时间500次考核中变化规律
Figure 5. Time delay of vacuum surface flashover switch in 500 shots
图 6 工作电压对开关开通时间、延迟时间和抖动的影响
Figure 6. Influence of switch operation voltage on open time ton, delay td and jitter
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