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首页> 外文期刊>IEEE Transactions on Dielectrics and Electrical Insulation >Empirical flashover model of EHV post insulators based on ISP parameter in cold environments
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Empirical flashover model of EHV post insulators based on ISP parameter in cold environments

机译：基于ISP参数的超高压后绝缘子寒冷环境经验闪络模型。

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摘要

The main objective of this contribution is to present an empirical model of ice-covered insulator flashover in accordance with an important flashover index, called icing stress product (ISP). The ISP as the product of the ice mass per centimeter of insulator length and the electrical conductivity of the melted ice accretion is used to establish an empirical model to determine the flashover voltage under icing conditions. To achieve this model, several tests were carried out on post station insulators typically used in Hydro-Quebec 735-kV substations, under DC and AC voltage, to determine the relationship between flashover stress and the ISP. The ISP-based method offers a good tool not only to select insulators for locations exposed to freezing conditions, but also to compare flashover results obtained under different test conditions. Moreover, to study the optimizing method of insulator flashover, the influence of air gaps on the flashover stress of ice-covered post insulators is investigated. The results reveal that the number of air gaps significantly affects the flashover stress. The test results are highly meaningful as they can be used as a reference for ranking several other insulator types and configurations in order to select the appropriate one for cold environments. Moreover, several mitigation options to improve insulator reliability in cold environments are provided.
机译：这项贡献的主要目的是根据一种重要的闪络指数，即结冰应力积（ISP），提供一个覆冰绝缘子闪络的经验模型。 ISP是每厘米绝缘子长度的冰块质量与融化的冰块积聚的电导率的乘积，用于建立经验模型以确定结冰条件下的闪络电压。为了获得该模型，在水电魁北克735 kV变电站中通常在直流和交流电压下对站后绝缘子进行了几次测试，以确定闪络应力与ISP之间的关系。基于ISP的方法不仅提供了一个很好的工具，不仅可以选择暴露在冰冻条件下的绝缘子，而且可以比较在不同测试条件下获得的闪络结果。此外，为研究绝缘子闪络的优化方法，研究了气隙对覆冰后绝缘子闪络应力的影响。结果表明，气隙的数量显着影响闪络应力。测试结果非常有意义，因为它们可以用作对其他几种绝缘子类型和配置进行排名的参考，以便为寒冷的环境选择合适的绝缘子。此外，提供了几种缓解措施，以提高寒冷环境中绝缘子的可靠性。

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