Breakdown strength and dielectric recovery in a high pressure supercritical nitrogen switch
Breakdown strength and dielectric recovery in a high pressure supercritical nitrogen switch
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高压超临界氮气开关的击穿强度和介电恢复
DOI：
10.1109/tdei.2015.005013
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发表时间：
2015
影响因子：
3.1
通讯作者：
Aram H. Markosyan
中科院分区：
文献类型：
--
作者：
J. Zhang;E. V. van Heesch;F. Beckers;A. Pemen;R. Smeets;T. Namihira;Aram H. Markosyan
大功率电路中的快速重复开关是一个具有挑战性的任务，最终的解决方案仍然需要找到。超临界流体（SCF）联合收割机了液体的良好特性-绝缘强度，热行为和气体-自我修复，高流动性和无气泡。这就是为什么我们开始研究SC媒体中的等离子体开关。初步结果表明，开关恢复良好，绝缘强度非常高。介绍了一种SCF绝缘开关（SC开关）的设计.的SCF的击穿强度进行了调查，发现是高的相比，大多数的固体绝缘介质。在重复频率高达5 kHz的重复30 kV、200 ns脉冲电压下测试SC N2开关内部的介电恢复。开关恢复击穿电压在200 μs内达到80%。在产生数百安高频电弧和数百伏瞬态恢复电压的合成电路中对SC N2的电流中断能力进行了实验研究。结果表明，具有固定电极和mm范围的电极间距离的SC N2开关可以在引弧后约2 ms成功地中断该电流。
Fast and repetitive switching in high-power circuits is a challenging task where the ultimate solutions still have to be found. We proposed a new approach. Supercritical fluids (SCFs) combine favorable properties of liquids - insulation strength, thermal behavior, and gases - self healing, high fluidity, and absence of vapor bubbles. That's why we start investigating the subject of plasma switches in SC media. First results indicate excellent switch recovery and very high insulation strength. We present the design of a SCF insulated switch (SC switch). Breakdown strength of the SCF is investigated and found to be high in comparison with most of the solid insulating media. The dielectric recovery inside the SC N2 switch is tested under a repetitive 30 kV, 200 ns pulse voltage at repetition rate up to 5 kHz. The recovery breakdown voltage across the SC switch achieves 80 % within 200 μs. The current interruption capability of SC N2 is investigated experimentally in a synthetic circuit generating a high-frequency arc of several hundreds of amperes and a transient recovery voltage of hundreds of volts. The results show that a SC N2 switch with fixed electrodes and an inter-electrode distance of mm range can successfully interrupt this current at approximately 2 ms after arc initiation.