Calcium sulfate and other slightly soluble salts in the natural pollution of catenary insulators could result in differences in flashover voltages between artificially and naturally polluted insulators at the same salt deposition density. Based on the insulator pollution characteristics in saline‐alkali areas and the saturated water absorption of polluted insulators, the equivalent salt deposit density and nonsoluble deposit density of insulators are corrected according to the influence of other coexisting soluble salts on the solubility of calcium sulfate. The correction formula of the insulator flashover voltage is proposed, which considers the equivalent salt deposit density, nonsoluble deposit density and pollution components. The results from the correction formula are compared with the experimental data from the artificial pollution test of the ceramic cap and pin insulator. The results show that salt‐alkali areas are more easy to flashover than other areas. The remaining pollutants can change the conductivity of the pollutant layer by inhibiting or promoting the dissolution of calcium sulfate. Moreover, its effect on the flashover voltage cannot be ignored. The error between the calculated value based on the correction formula and the experimental data is below 6%. A pollution flashover warning mechanism based on relevant meteorological data is proposed. The results can be used as an important reference for the operation and maintenance of catenary insulators in saline‐alkali areas. © 2020 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

中文翻译：

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基于盐碱区可溶性盐成分分析的悬链绝缘子闪络电压校正

在悬链线绝缘子的自然污染中，硫酸钙和其他微溶盐可能会导致在相同的盐沉积密度下，人工污染的绝缘子和自然污染的绝缘子之间的闪络电压存在差异。根据盐碱地区绝缘子的污染特征和污染绝缘子的饱和吸水率，根据其他共存可溶性盐对硫酸钙溶解度的影响，对绝缘子的等效盐沉积密度和非可溶性沉积密度进行校正。提出了考虑等效盐析出密度，不溶性析出密度和污染成分的绝缘子闪络电压校正公式。将校正公式的结果与陶瓷帽和插针绝缘子的人工污染试验的实验数据进行比较。结果表明，盐碱地区比其他地区更容易闪络。剩余的污染物可通过抑制或促进硫酸钙的溶解来改变污染物层的电导率。此外，它对闪络电压的影响也不容忽视。基于校正公式的计算值与实验数据之间的误差低于6％。提出了一种基于相关气象数据的污染闪络预警机制。研究结果可为盐碱地区接触网绝缘子的运行和维护提供重要参考。©2020日本电气工程师学会。由John Wiley和出版