高压电器2018，Vol.54Issue(5)：38-43,6.DOI:10.13296/j.1001-1609.hva.2018.05.006
SF6/CF4混合气体中聚四氟乙烯绝缘表面直流闪络特性
DC Flashover Characteristics on PTFE Surface in SF6/CF4 Mixture
杨明智 1林莘 1温苗 1李晓龙1
作者信息
- 1. 沈阳工业大学电气工程学院,沈阳 110870
- 折叠
摘要
Abstract
This paper is aimed at the study of the DC flashover characteristics of PTFE sample immersed in SF6/CF4 mixture, the electrode gap of finger-type electrodes is 5 mm. The flashover voltage of sample surface in SF6/CF4 mixture is measured with the partial pressure ratio of SF6 varying from 0％ to 100％ and the gas pressure from 0. 1 MPa to 0. 4 MPa. The influence of gas pressure, partial pressure ratio and voltage polarity on the flashover characteristics of sample are studied. Experiment results show that between 0. 1 MPa and 0. 4 MPa the flashover voltage of the sample in SF6/CF4 gas mixtures increase with pressure at constant partial pressure ratio of SF6. When the pressure is 0. 3 MPa and the partial pressure ratio of SF6 is 20％, the negative DC flashover voltage in the mixture is 52. 34 kV, which is61. 4％ of that in pure SF6 at the same pressure. The flashover voltage under negative DC voltage is lower than that under positive voltage. However, when the pressure exceeds a critical value, the flashover voltage presents polarity-reversal with the pressure growing. The negative DC flashover voltage of 40％SF6/60％CF4 has reached 65％ of pure SF6. This research provides a reference for the application of SF6/CF4 gas mixtures in high-voltage DC insulation devices.关键词
SF6/CF4混合气体/沿面闪络/聚四氟乙烯/高压直流/极性效应Key words
SF6/CF4 mixture/flashover/PTFE/HVDC/polarity effect引用本文复制引用
杨明智,林莘,温苗,李晓龙..SF6/CF4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(5):38-43,6.
