DC Flashover Characteristics on PTFE Surface in SF<sub>6</sub>/CF<sub>4</sub> Mixture

YANG Mingzhi; LIN Xin; WEN Miao; LI Xiaolong

doi:10.13296/j.1001-1609.hva.2018.05.006

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DC Flashover Characteristics on PTFE Surface in SF₆/CF₄ Mixture

更新时间：2025-04-26

- DC Flashover Characteristics on PTFE Surface in SF₆/CF₄ Mixture
- High VoltageApparatus Vol. 54, Issue 5, Pages: 38-43(2018)
- 作者机构：
  
  沈阳工业大学电气工程学院
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2018.05.006
  CLC： TM21
- Published：2018
- 稿件说明：
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[1]杨明智,林莘,温苗,李晓龙.SF_6/CF_4混合气体中聚四氟乙烯绝缘表面直流闪络特性[J].高压电器,2018,54(05):38-43.

YANG Mingzhi, LIN Xin, WEN Miao, et al. DC Flashover Characteristics on PTFE Surface in SF₆/CF₄ Mixture[J]. High voltageapparatus, 2018, 54(5): 38-43.
[1]杨明智,林莘,温苗,李晓龙.SF_6/CF_4混合气体中聚四氟乙烯绝缘表面直流闪络特性[J].高压电器,2018,54(05):38-43. DOI： 10.13296/j.1001-1609.hva.2018.05.006.

YANG Mingzhi, LIN Xin, WEN Miao, et al. DC Flashover Characteristics on PTFE Surface in SF₆/CF₄ Mixture[J]. High voltageapparatus, 2018, 54(5): 38-43. DOI： 10.13296/j.1001-1609.hva.2018.05.006.

摘要

文中对电极间距为5 mm的指形电极下SF

/CF

混合气体中聚四氟乙烯绝缘表面直流闪络特性展开研究

分别测量了当SF

/CF

混合气体中SF

混合比为0%

00%、压强为0.1

.4 MPa时绝缘试样的直流沿面闪络电压

研究压强、混合比、电压极性等因素对绝缘试样直流沿面闪络特性的影响。实验结果表明:混合气体中SF

混合比一定时

在0.1

.4 MPa气压范围内

绝缘试样的直流闪络电压随气压升高而呈线性增加;0.3 MPa的20%SF

/80%CF

气体中绝缘试样的负极性直流闪络电压为52.34 kV

是相同气压下纯SF

气体中的61.4%;在较低气压下SF

/CF

混合气体中绝缘试样的负极性直流闪络电压比正极性低

而当气压高于某临界值时

负极性直流闪络电压比正极性高

沿面闪络电压出现极性效应反转现象;40%SF

/60%CF

中负极性闪络电压达到纯SF

中的65%

该研究可以为SF

/CF

混合气体替代SF

应用于高压直流气体绝缘电气设备中提供参考。

Abstract

This paper is aimed at the study of the DC flashover characteristics of PTFE sample immersed in SF

/CF

mixture

the electrode gap of finger-type electrodes is 5 mm. The flashover voltage of sample surface in SF

/CF

mix-ture is measured with the partial pressure ratio

of SF

varying from 0% to 100% and the gas pressure from 0.1 MPa to0.4 MPa. The influence of gas pressure

partial pressure ratio and voltage polarity on the flashover characteristics ofsample are studied. Experiment results show that between 0.1 MPa and 0.4 MPa the flashover voltage of the samplein SF

/CF

gas mixtures increase with pressure at constant partial pressure ratio of SF

. When the pressure is 0.3 MPaand the partial pressure ratio of SF

is 20%

the negative DC flashover voltage in the mixture is 52.34 kV

which is61.4% of that in pure SF

at the same pressure. The flashover voltage under negative DC voltage is lower than that un-der positive voltage. However

when the pressure exceeds a critical value

the flashover voltage presents polarity-re-versal with the pressure growing. The negative DC flashover voltage of 40%SF

/60%CF

has reached 65% of pure SF

.This research provides a reference for the application of SF

/CF

gas mixtures in high-voltage DC insulation devices.

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⁰

DC Flashover Characteristics on PTFE Surface in SF6/CF4 Mixture

DOI：10.13296/j.1001-1609.hva.2018.05.006

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Abstract

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DC Flashover Characteristics on PTFE Surface in SF₆/CF₄ Mixture