Calculation of Saturated Vapor Pressure and Insulation Characteristics on Mixtures of SF<sub>6</sub> and CF<sub>4</sub>

TIAN Yu; ZHANG Han; ZHAO Hu

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Calculation of Saturated Vapor Pressure and Insulation Characteristics on Mixtures of SF₆ and CF₄

更新时间：2025-12-08

- Calculation of Saturated Vapor Pressure and Insulation Characteristics on Mixtures of SF₆ and CF₄
- Vol. 43, Issue 3, Pages: 765-771(2017)
- 作者机构：
  
  1. 中国南方电网超高压输电公司检修试验中心
  2. 西北工业大学自动化学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：10 March 2017，
  
  Published：2017
- 稿件说明：
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TIAN Yu, ZHANG Han, ZHAO Hu. Calculation of Saturated Vapor Pressure and Insulation Characteristics on Mixtures of SF₆ and CF₄[J]. 2017, 43(3): 765-771.
DOI：

TIAN Yu, ZHANG Han, ZHAO Hu. Calculation of Saturated Vapor Pressure and Insulation Characteristics on Mixtures of SF₆ and CF₄[J]. 2017, 43(3): 765-771. DOI：

摘要

为分析SF

/CF

混合气体的饱和蒸气压与绝缘特性

进而探讨SF

/CF

混合气体替代SF

气体应用于高寒地区的可行性。首先

采用全局最优化算法拟合得到了SF

和CF

的Antoine特性常数

然后通过Antoine蒸汽压方程和汽液平衡基本定律相结合

计算了SF

/CF

混合气体的饱和蒸气压特性。然后

基于Boltzmann解析法获得了SF

/CF

混合气体的临界击穿场强数据。最后

综合SF

/CF

混合气体的饱和蒸气压特性与临界击穿场强数据

讨论了SF

/CF

混合气体的绝缘特性及在高寒地区应用的可行性。结果表明:在低温条件下

/CF

混合气体所允许的压力明显高于纯SF

从而可以获得较纯SF

更高的绝缘强度

如–40℃时摩尔分数50%SF

/50%CF

混合气体和SF

气体的饱和蒸气压分别约为0.64 MPa和0.35 MPa

相应压力下的临界击穿场强分别约为43.5 k V/mm和31.34 k V/mm

即50%SF

/50%CF

混合气体的绝缘强度可以达到纯SF

气体的1.4倍

说明SF

/CF

混合气体采用恰当的混合比例和充气压力能够有效解决SF

在高寒地区的液化问题。

Abstract

The relatively high liquefaction temperature of SF

gas limits its use in cold areas

while adding some CF

gas to SF

gas is considered as an effective way to deal with the issue.We analyzed the saturated vapor pressure and insulation characteristics of SF

/CF

mixture

and discussed the feasibility of applying SF

/CF

mixture to substitute SF

gas for cold areas.First

the Antoine constants of SF

and CF

gases were obtained by the global optimization method.Then the saturated vapor pressures of SF

/CF

mixtures were determined by combining the Antoine equation and the basic law of vapor liquid equilibrium.Secondly

the critical electric field strengths of SF

/CF

mixtures were calculated with Boltzmann analysis.Finally

the insulation properties and applications for cold areas of SF

/CF

mixture were discussed by combining the saturated vapor pressure characteristic and critical electric field strength.The results show that the allowable gas pressure of SF

/CF

mixture is remarkably higher than that of pure SF

gas under a quite low temperature

and then the insulation strength of SF

/CF

mixture can be superior to that of pure SF

gas.At-40 ℃

the saturated vapor pressures of 50%SF

/50%CF

mixture and SF

gas are about 0.64 MPa and 0.35 MPa

respectively

and the critical electric field strengths at corresponding pressures are about 43.5 k V/mm and 31.34 k V/mm.This means that the insulation strength of SF

/CF

mixture at a mixed ratio of 50%/50% reaches 1.4 times of SF

gas

and the SF

/CF

mixture under a proper mixed ratio and gas pressure can prevent the liquefaction of SF

gas in cold areas.

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Related Institution

Postdoctoral Workstation of Yunnan Power Grid Corporation

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AI问答

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Calculation of Saturated Vapor Pressure and Insulation Characteristics on Mixtures of SF6 and CF4

DOI：

摘要

Abstract

关键词

Keywords

references

Calculation of Saturated Vapor Pressure and Insulation Characteristics on Mixtures of SF₆ and CF₄