Calculation and Characteristic Analysis of Critical Breakdown Field Strength of SF<sub>6</sub> and the Mixtures

doi:10.7652/xjtuxb201302019

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Calculation and Characteristic Analysis of Critical Breakdown Field Strength of SF₆ and the Mixtures

更新时间：2025-07-09

- Calculation and Characteristic Analysis of Critical Breakdown Field Strength of SF₆ and the Mixtures
- Vol. 47, Issue 2, Pages: 109-115(2013)
- 作者机构：
  
  西安交通大学电力设备电气绝缘国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201302019
  CLC： O121.8;G558
- Online First：10 February 2013，
  
  Published：2013
- 稿件说明：
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Calculation and Characteristic Analysis of Critical Breakdown Field Strength of SF₆ and the Mixtures[J]. 2013, 47(2): 109-115. DOI: 10.7652/xjtuxb201302019.
DOI：

Calculation and Characteristic Analysis of Critical Breakdown Field Strength of SF₆ and the Mixtures[J]. 2013, 47(2): 109-115. DOI: 10.7652/xjtuxb201302019. DOI：

摘要

为了在弧后电击穿评估时得到热态SF

及其替代或混合气体的准确临界击穿场强

通过求解两项近似Boltzmann方程

得到了SF

气体在0.4 MPa和0.8 MPa下、300～3 000 K范围内的折合临界击穿场强(E/N)

。结果表明:SF

气体的(E/N)

随温度升高而跌落

其减小速度与SF

的分解速度有关; 在1 500～2 500 K范围内

气体在0.8 MPa下的(E/N)

明显高于0.4 MPa下的(E/N)

而在其他温度下

二者的(E/N)

非常接近。同时

计算了SF

-CF

、SF

-CO

、SF

-O

、SF

-CH

、SF

-C

和SF

-CHF

在300 K下的(E/N)

发现当x(SF

)超过10%以后

6种混合气体的(E/N)

随x(SF

)近似线性变化

且6种纯气体中CF

和O

的(E/N)

最大

而与SF

混合后

-CF

和SF

-O

的(E/N)

相当

仍高于其他混合气体。此外

还引入了SF

与混合气体击穿场强的比值r

在一定范围内只要混合比例与压强适当

混合气体可得到与SF

相当的击穿场强。

Abstract

The reduced critical electric breakdown field(E/N)

of SF

and its substitute or mixtures gets very crucial for electrical breakdown evalution. Th

e(E/N)

of SF

is investigated under 0.4 MPa and 0.8 MPa respectively

and over the temperature range of 300 to 3 000 K

by solving the two-term Boltzmann equation. The results show that the(E/N)

of SF

decreases with increasing temperature

and the decreasing rate depends on the SF

decomposition rate; at temperature within 1 500 and 2 500 K

the(E/N)

of SF

under 0.8 MPa is evidently higher than that under 0.4 MPa

however almost equal between 0.8 MPa and 0.4 MPa at other temperature. The calculations for(E/N)

of SF

-CF

、SF

-CO

、SF

-O

、SF

-CH

、SF

-C

and SF

-CHF

under 300 K indicate

when x(SF

)in mixture is over 10%

the(E/N)

of all these mixtures changes approximately linearly with x(SF

); among these gases

the(E/N)

of CF

and O

approaches to the highest; the(E/N)

of SF

-CF

and SF

-O

closely appears

and both higher than that of the others. And r

the ratio of the critical breakdown field of SF

to that of a gas mixture

is introduced to conclude that under proper pressure and mixing ratio

the critical breakdown field of a gas mixture becomes equivalent to SF

关键词

Keywords

references

NAGATA M, MIYACHI I, YOKOI Y, et al. Measurement of electron drift, diffusion and effective ionization coefficients in the SF6-CHF3 and SF6-CF4 gas mixtures [J]. Journal of Physics: D Applied Physics, 2003, 36(24): 3132-3137.

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Calculation and Characteristic Analysis of Critical Breakdown Field Strength of SF6 and the Mixtures

DOI：10.7652/xjtuxb201302019

摘要

Abstract

关键词

Keywords

references

Calculation and Characteristic Analysis of Critical Breakdown Field Strength of SF₆ and the Mixtures