Experimental Study on Performance of SF6+N2 Mixed Gas Insulation
1 Heilongjiang Electric Power Science Research Institude, Xiangjiang Road No.7, 150030 Harbin, Heilongjiang Province, China
2 Sulfur hexafluoride gas purification Laboratory of Analysis and Processing Technology of State Grid Corporation, Jinzhai Road No. 73, 230022 Hefei, Anhui Province, China
3 China ENFI Engineering Corporation, Fuxing Road No. 12, 100038 Beijing, China
a Corresponding author: firstname.lastname@example.org
This paper designed and constructed a 126kV GIS partial discharge test platform, performed frequency breakdown tests and lighting impulse tests at temperature of -30~20℃to SF6/N2 gas mixture. The present experiment studied frequency breakdown tests in different temperatue and slightly inhomogeneous electric field, obtained change in frequency breakdown voltage as a function of temperature; Analysed positive and negative lightning impluse test in gas mixture, in which SF6 had a propotion of 30%~60%, in different temperature. Results indicated 50% probability breakdown voltage variation in positive lightning impluse tests, and in a low temperature environment, the breakdown voltage increased at negative lightning impulse, the polarity effects varied with condition of pure SF6 gas. The experimental results showed implement of SF6/N2 mixed gas with 30% SF6 supersedespure SF6 gas, could effectively reduce the consume of SF6, and remit greenhouse efect.
© Owned by the authors, published by EDP Sciences, 2016
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