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快脉冲同轴场下间距变化的闪络分析

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Keywords: 纳秒脉冲,同轴电极,间隙距离,沿面闪络,三结合点,沿面电位

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Abstract:

在纳秒脉冲同轴电场下,尼龙1010的闪络电压随着内、外电极半径差近似线性增长,且外加脉冲陡度越大,其闪络电压越高。纳秒脉冲下的沿面闪络特性与固体-液体-电极三结合点处的场强及沿面电位梯度分布紧密相关,内、外电极半径差越大,虽然三结合点处场强提高程度越严重,沿面电位分布越不均匀,但是内电极表面场强急剧降低,综合导致沿面闪络电压随着内、外电极半径差近似线性提高。分析表明,当同轴结构内、外电极半径差足够大时,同轴电场的平均闪络场强可以用均匀电场的平均闪络场强来估算。

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