Breakdown characteristics of SF6/N2 in severely non-uniform electric fields at low temperatures
SF6 has good electrical insulating properties,which is widely used as an insulating medium of GIS,GIL and other electrical equipment.However,the reliability of electrical equipments′ insulated gas is greatly challenged in cold areas,since SF6 more readily liquefies.To solve the problem,SF6 can be mixed with N2 to maintain the insulating properties,and reduce its liquefaction temperature.Such practice has certain application prospect.In this paper,a breakdown experimental platform was built to study the insulating property of SF6/N2 at low temperature,wherein the temperature of the platform can be adjusted.A severely non-uniform electric field was generated by a rod-plate electrode.The breakdown characteristics of SF6/N2 with different mixing proportions at low pressures and low temperatures were measured.The result showed that the mixed gas was not liquefied within the temperature range.Temperature had insignificant influence on the insulating property thereof.The result in the paper has certain guiding significance for applying SF6/N2 mixed gas in high latitude areas.
Y Wang Z W Gao G X Li X C Zhu C L Yu J Q Liang L Li
State Grid Heilongjiang Electric Power Company Limited Electric Power Research Institute,Harbin,Heilongjiang Province,China
国际会议
三亚
英文
1-6
2017-11-18（万方平台首次上网日期，不代表论文的发表时间）