In this work, effect of the oscillation frequency on the oil surface flashover characteristics under lightning impulse voltage is experimentally studied. Four lightning impulse (OLI) waves with different oscillation frequencies and 1.2/50 µs standard lightning impulse (SLI) wave are used in this study. The experiment results show that flashover voltages under OLI are larger than those under SLI and the flashover time lags under OLI are longer than those under SLI. Additionally, the flashover voltage tends to increase and the time lag tends to be shorter as the oscillation frequency increases. According to the experimental results and the discharge theory of liquids, we believe that the waveform oscillation frequency affects both the effective electron generation time lag and the formative time lag. This work provides a reference for the waveform selection of the on-site withstand voltage test and explains the physical mechanism of the oil flashover discharge from the perspective of impulse waveform oscillation.

中文翻译：

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雷电脉冲振荡频率对油压板闪络影响的实验研究

在这项工作中，实验研究了雷电冲击电压下振荡频率对油面闪络特性的影响。本研究使用四个具有不同振荡频率的雷电脉冲（OLI）波和1.2 / 50 µs标准雷电脉冲（SLI）波。实验结果表明，在OLI下的闪络电压大于SLI下的闪络电压，在OLI下的闪络时间滞后比在SLI下的闪络时间滞后更长。另外，随着振荡频率的增加，闪络电压趋于增加，并且时滞趋于变短。根据实验结果和液体的放电理论，我们认为波形振荡频率会影响有效电子产生时间滞后和形成时间滞后。