Effect of Gas Content on Surface Charge Accumulation of Epoxy Insulator in C 4 F 7 N/CO 2 /O 2 Mixture Under AC Voltage

Chuanyun Zhu, Xiaohui Duan, Shuangying Li (), Zhen Zhang, Jian Guan, Yuepeng Xin and Yu Gao
Additional contact information
Chuanyun Zhu: Henan Pinggao Electric Co., Ltd., No. 22, Nanhuan East Road, Pingdingshan 467000, China
Xiaohui Duan: Henan Pinggao Electric Co., Ltd., No. 22, Nanhuan East Road, Pingdingshan 467000, China
Shuangying Li: Economic and Technology Research Institute, State Grid Henan Electric Power Company, No. 87, Songshan South Road, Zhengzhou 450000, China
Zhen Zhang: Henan Pinggao Electric Co., Ltd., No. 22, Nanhuan East Road, Pingdingshan 467000, China
Jian Guan: Henan Pinggao Electric Co., Ltd., No. 22, Nanhuan East Road, Pingdingshan 467000, China
Yuepeng Xin: Zhengzhou Power Supply Company, State Grid Henan Electric Power Company, No. 87, Songshan South Road, Zhengzhou 450000, China
Yu Gao: School of Electrical and Information Engineering, Tianjin University, 92 Weijin Road, Tianjin 300072, China

Energies, 2025, vol. 18, issue 16, 1-13

Abstract: Perfluoroisobutyronitrile (C 4 F 7 N) has emerged as a promising SF 6 alternative due to its superior dielectric properties and acceptable environmental impact. However, the gas–solid interfacial charge accumulation behavior in such gas mixtures requires in-depth and systematic investigation. This study investigated the surface charge accumulation behavior on scaled disc insulators in C 4 F 7 N/CO 2 /O 2 mixtures under AC voltage. By constructing a high-precision surface charge measurement platform, the influence mechanisms of varying gas composition ratios of C 4 F 7 N (2–14%) with fixed O 2 content and O 2 (2–14%) with fixed C 4 F 7 N content on charge accumulation were analyzed. The results demonstrated that increasing C 4 F 7 N content significantly suppresses surface charge accumulation. When the C 4 F 7 N concentration rises from 2% to 14%, the maximum positive/negative charge densities decrease by 46.58% and 22.22% in the absence of metal particles. The suppression effect is more pronounced with the metal particle present, where the reductions in positive/negative charge densities reach 61.90% and 23.71% under the same conditions. In contrast, variations in O 2 content exhibit a weaker impact on charge accumulation, showing no consistent regulatory effect within the 2–14% range. By comparing charge distribution patterns under different gas compositions, it is revealed that C 4 F 7 N suppresses gas ionization primarily by enhancing electronegativity, while O 2 exhibits negligible influence on charge transport. This study provides critical experimental evidence for optimizing gas ratios and insulation design in AC GIS equipment.

Keywords: GIS; epoxy insulator; C 4 F 7 N/CO 2 /O 2; surface charge; gas components (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
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/18/16/4390/pdf (application/pdf)
https://www.mdpi.com/1996-1073/18/16/4390/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:18:y:2025:i:16:p:4390-:d:1726747

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().