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5. Surface Flashover Characteristics of Cylindrical Insulator in C 4 F 7 N/CO 2 Mixture Under Switching Impulse Voltage.

Author

Meng, Yang, Ding, Weidong, Li, Zhichuang, Zheng, Zhongbo, Xue, Haorui, and Liu, Wen

Subjects
FLASHOVER, CARBON dioxide, VOLTAGE, DIELECTRIC strength, MOLE fraction, SULFUR hexafluoride, ELECTRIC insulators & insulation
Abstract

C4F7N/CO2 mixture has been widely studied as an environmental-friendly insulating gas expected to replace sulfur hexafluoride (SF6) in high-voltage equipment. In high-voltage power systems, the medium dielectric characteristics under switching impulse (SI) voltage are an important factor in insulation coordination. Nevertheless, few studies on this aspect of C4F7N/CO2 mixture have been reported. This article investigates the surface flashover of a cylindrical insulator in a C4F7N/CO2 mixture under switching voltage. The effects of molar fraction, gas pressure, creepage distance, and insulator materials on surface flashover voltage are studied in a uniform field. The result shows that the increase of flashover voltage indicates a saturation trend with the increase of C4F7N molar fraction and pressure, respectively. The dielectric strength of 13% C4F7N/87% CO2 relative to SF6 can reach at least 84%. The limiting factors of the flashover voltage increase under high pressure are preliminarily discussed. Additionally, the empirical formula on the critical flashover electrical field has been obtained, which can provide a reference for insulation design for environment-friendly gas insulation equipment. [ABSTRACT FROM AUTHOR]

Published
2022
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