The aim of this paper is to quantify the evolution’s effect of parallel electrical discharges on the performance of a plane insulation placed simultaneously under conditions of a non-uniform transversal distribution of pollution and positive DC voltage. The results emanating from this experimental study revealed a maximum increase about 18% of flashover voltage of insulation’s non-uniform transversal distribution of the insulation compared to that obtained under uniform pollution distribution. The existence of a limit value of the electrical conductivities’ ratio of the lightly and the heavily contaminated bands, characterized by an early development of the electrical flashover arc of the insulation in the heavily polluted band, was demonstrated in this investigation. Also, a direct link has been established between the flashover frequency of the insulation’s highly contaminated band, under the effect of a non-uniform transversal distribution of pollution and its electrical resistance. Similarly, an approximation linking the insulation’s length to the effective width of an electrical arc in its last phase of development and consequently the number of electrical arcs that can develop in the two differently polluted bands just before the insulation’s flashover was done in this study.

中文翻译：

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平行放电效应下非均匀横向污染玻璃绝缘的直流性能

本文的目的是量化平行放电对同时放置在非均匀横向分布污染和正直流电压条件下的平面绝缘性能的演变影响。该实验研究的结果表明，与在均匀污染分布下获得的电压相比，绝缘体的非均匀绝缘横向分布的闪络电压最大增加了约 18%。本次调查证明了轻度和重度污染带的电导率比值的存在，其特征是在重度污染带中绝缘的电闪络电弧的早期发展。还，在污染的非均匀横向分布的影响下，绝缘体高度污染带的闪络频率与其电阻之间建立了直接联系。类似地，在本研究中，将绝缘长度与电弧在其最后发展阶段的有效宽度联系起来的近似值，以及在绝缘闪络之前两个不同污染带中可能产生的电弧数量的近似值。