Influence of PTFE Vapor on Dielectric Breakdown Property of Hot SF6 Gas

被引：0

作者：

Wang L. ^{[1
]}

Zhao H. ^{[2
]}

Zhang H. ^{[3
]}

Wang Z. ^{[1
]}

Li X. ^{[4
]}

机构：

[1] Electric Power Research Institute, Guangdong Power Grid Corporation Co., Ltd., Guangdong

[2] School of Automation, Northwestern Polytechnical University, Xi'an

[3] Maintenance & Test Center, Extra High Voltage Transmission Company, China Southern Power Grid, Guangzhou

[4] State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an

来源：

Gaodianya Jishu/High Voltage Engineering | 2017年 / 43卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Arc; Dielectric breakdown property; High voltage circuit breaker; Interruption; Nozzle ablation; SF[!sub]6[!/sub]-PTFE mixture;

D O I：

10.13336/j.1003-6520.hve.20170303015

中图分类号：

学科分类号：

摘要：

PTFE vapor has a crucial effect on the interruption performance of SF6 circuit breakers. Therefore, we analyzed the influences of PTFE vapor on the dielectric breakdown properties of hot SF6 gas at gas pressures of 0.01~1.6 MPa and gas temperatures up to 3 500 K, which represents the conditions prevailing during the dielectric recovery phase in a high voltage circuit breaker. By minimizing the Gibbs free energy under the assumptions of local thermodynamic and chemical equilibrium, we calculated the equilibrium compositions of SF6 mixtures with PTFE vapor, and analyzed the reduced ionization coefficient α/N, the reduced attachment coefficient η/N, and the reduced effective ionization coefficient (α-η)/N. Moreover, the critical reduced electric field strength (E/N)cr was determined by balancing the electron generation and loss processes. The results confirm the superior breakdown properties of pure SF6 at relatively low gas temperatures. However, (E/N)cr of SF6 mixtures with PTFE vapor are clearly higher than that of pure SF6 for high gas temperatures. In addition, it is also noted that the increase of gas pressure shifts the variations of (E/N)cr to higher gas temperatures. © 2017, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

引用

页码：801 / 807

页数：6

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