External Insulation Performance under DC Voltages of Polluted Post Insulators for Power Stations in Rainy Weather: A Brief Review and Recent Progress

Yuxi Dong, Zili Wang, Mingguang Diao (), Xi Wang, Yu Deng (), Bin Cao, Ying Xu and Chuyan Zhang ()
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Yuxi Dong: School of Information Engineering, China University of Geosciences Beijing, Beijing 100083, China
Zili Wang: School of Information Engineering, China University of Geosciences Beijing, Beijing 100083, China
Mingguang Diao: School of Information Engineering, China University of Geosciences Beijing, Beijing 100083, China
Xi Wang: Tibet Yangbajing High Altitude Electrical Safety and Electromagnetic Environment National Observation and Research Station, Tibet 851517, China
Yu Deng: Tibet Yangbajing High Altitude Electrical Safety and Electromagnetic Environment National Observation and Research Station, Tibet 851517, China
Bin Cao: Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
Ying Xu: State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China
Chuyan Zhang: School of Information Engineering, China University of Geosciences Beijing, Beijing 100083, China

Energies, 2024, vol. 17, issue 16, 1-16

Abstract: The discharge and flashover phenomenon of post insulators in rainy weather has not been given sufficient consideration; however, with the construction of ultra-high voltage power grids, the performance of the external insulation and the ability to withstand special climate conditions need to be guaranteed. Therefore, it is meaningful to conduct studies on the discharge characteristics of contaminated post insulators under rainfall conditions. Moreover, the conventional perception tends to confuse the flashover of polluted insulators in the rain with the pollution flashover that occurs in the fog; however, in fact, the discharge of contaminated insulators that occurs during rainfall has characteristics that can be distinguished from the pollution flashover. In this study, firstly, the current status of research on the external insulation characteristics of post insulators was analyzed through an examination of the available literature. Secondly, the concept of a ‘pollution rain flashover’ of insulators was established and clarified, to distinguish it from the traditional meaning of ‘pollution flashover’ or ‘contamination flashover’. Thirdly, research results on the pollution rain flashover of post insulators used in power stations in recent years were summarized, which included the characteristics and mechanism of the discharge, parameters and factors influencing the flashover voltage, and their influence laws. Particularly, the gap discharge between insulator sheds triggered by raindrops, which is the most significant feature of the pollution rain flashover, and the profile optimization of sheds, which is an effective way to improve the performance, were emphasized in this work. Fourthly, the prevention methods were studied, which mainly include the application of rainproof sheds and the shed optimization for pollution rain flashover of post insulators. Finally, a brief prospect is given for future research.

Keywords: post insulator; pollution rain flashover; external insulation; water-droplet discharge; flashover under DC voltage; optimization of shed parameters (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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