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首页> 外文期刊>Dielectrics and Electrical Insulation, IEEE Transactions on >Influence of the linear non-uniformity of pollution layer on the insulator flashover under impulse voltage - estimation of the effective pollution thickness
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Influence of the linear non-uniformity of pollution layer on the insulator flashover under impulse voltage - estimation of the effective pollution thickness

机译：脉冲电压下污染层线性不均匀性对绝缘子闪络的影响-有效污染厚度的估算

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摘要

This paper is aimed at the influence of the linear non uniformity of pollution layer on critical current Icri and critical flashover voltage Vcri of polluted insulator under lightning impulse voltage. It is shown that the experimental values of Icri and Vcri of uniformly and non-uniformly polluted insulator depends on the configuration of pollution and the polarity of voltage. A mathematical model enabling to compute the flashover discharge characteristic constants (n and N) and the critical thickness of pollution layer and thence the critical characteristics of flashover (current and voltage) is presented. It's also shown that n and N are not static and they depend on the parameters of the equivalent electrical circuit, thermal characteristics of discharge and the condition of propagation. The computed critical voltages are found in a good accordance with the experimental ones while the computed critical currents are higher than the experimental ones. The recalculated critical currents and critical voltages assuming that only a part of the thickness of pollution layer contributes to the conduction phenomena at the interface between the discharge and electrolyte well match to the experimental values. Thus there is an effective thickness of pollution layer which varies linearly with the resistivity of pollution layer.
机译：本文针对污染层的线性不均匀性对雷电冲击电压下绝缘子的临界电流Icri和临界闪络电压Vcri的影响。结果表明，均匀污染和非均匀污染绝缘子的Icri和Vcri实验值取决于污染的构成和电压的极性。建立了一个数学模型，可以计算出闪络放电特性常数（n和N）和污染层的临界厚度，从而计算出闪络的临界特性（电流和电压）。还表明n和N不是静态的，它们取决于等效电路的参数，放电的热特性和传播条件。发现计算出的临界电压与实验值非常吻合，而计算出的临界电流却高于实验值。重新计算的临界电流和临界电压假设只有部分污染层的厚度有助于放电和电解质之间的界面处的导电现象，与实验值完全吻合。因此，污染层的有效厚度随污染层的电阻率线性变化。

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