Effect of AC Pre-Charging of Epoxy Insulator on Flashover Properties in Eco-Friendly Binary Gas Mixtures

Jian Guan, Guohui Han, Qifeng Shang (), Xiaohu Qi, Zhiying Wang and Yu Gao
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Jian Guan: Henan Pinggao Electric Co., Ltd., No. 22, Nanhuan East Road, Pingdingshan 467000, China
Guohui Han: Henan Pinggao Electric Co., Ltd., No. 22, Nanhuan East Road, Pingdingshan 467000, China
Qifeng Shang: School of Electrical and Information Engineering, Tianjin University, 92 Weijin Road, Tianjin 300072, China
Xiaohu Qi: Henan Pinggao Electric Co., Ltd., No. 22, Nanhuan East Road, Pingdingshan 467000, China
Zhiying Wang: Henan Pinggao Electric Co., Ltd., No. 22, Nanhuan East Road, Pingdingshan 467000, China
Yu Gao: School of Electrical and Information Engineering, Tianjin University, 92 Weijin Road, Tianjin 300072, China

Energies, 2025, vol. 18, issue 21, 1-11

Abstract: Metal particles and surface charge accumulation are considered the key factors that could trigger unexpected flashovers of insulators equipped in gas-insulated switchgear (GIS). In eco-friendly gases, the flashover properties and the synergistic effect of the surface charge and the metal particle on flashover remain unclear. This study investigates the flashover properties of down-scaled 252 kV GIS basin-type epoxy insulators with metal particles in C 4 F 7 N/CO 2 mixtures, with and without AC pre-charging. Tests considered various particle adherence locations and a particle-free control group. The results indicated that metal particles at the high-voltage (HV) electrode or middle area reduce flashover voltage, with the HV electrode and concave surface being most critical. Surface charges, induced by pre-charging and metal particle attachment, interact synergistically with the metal particle during the flashover process, increasing the flashover voltage and redirecting arcs away from them. Such findings enhance understanding of flashover mechanisms in eco-friendly gas-insulated systems and inform insulator design.

Keywords: gas-insulated switchgear; C 4 F 7 N/CO 2; flashover; surface charge; metal particle (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: 2025
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