Influence of the gassing materials on the dielectric properties of air

• Published in: Plasma science & technology Vol. 19; no. 5; pp. 68 - 73
• Main Author: 张含天 厉天威 罗兵 吴翊 杨飞 孙昊 唐力
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.05.2017
• Subjects: air circuit breaker; Boltzmann equation analysis; critical reduced electric field strength; dielectric properties; EEDF; electron collision cross section; gassing materials; 介电性能; 体材料; 出气; 吉布斯自由能; 电子碰撞; 电子能量分布函数; 空气断路器; 计算结果
• ISSN: 1009-0630; 1009-0630
• DOI: 10.1088/2058-6272/aa57f5

Influence of the gassing materials, such as PA6, PMMA, and POM on the dielectric properties of air are investigated. In this work, the fundamental electron collision cross section data were carefully selected and validated. Then the species compositions of the air–organic vapor mixtures were calculated based on the Gibbs free energy minimization. Finally, the Townsend ionization coefficient, the Townsend electron attachment coefficient and the critical reduced electric field strength were derived from the calculated electron energy distribution function by solving the Boltzmann transport equation. The calculation results indicated that H_2O with large attachment cross sections has a great impact on the critical reduced electric field strength of the air–organic vapor mixtures. On the other hand, the vaporization of gassing materials can help to increase the dielectric properties of air circuit breakers to some degree.