温度对SF_(6)/CF_(4)混合气体尖板放电特性的影响  

Temperature Effect on Tip-plate Discharge Characteristics of SF_(6)/CF_(4) Gas Mixture

作　　者：陈远东 郑宇 孟辉 沈腾达 梁建 周文俊[2] CHEN Yuandong;ZHENG Yu;MENG Hui;SHEN Tengda;LIANG Jian;ZHOU Wenjun(UHV Branch of Inner Mongolia Eastern Power Limited Liability Company of State Grid,Inner Mongolia Tongliao 028000,China;School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)

机构地区：[1]国网内蒙古东部电力有限公司超特高压分公司,内蒙古通辽028000 [2]武汉大学电气与自动化学院,武汉430072

出　　处：《高压电器》2024年第9期61-68,共8页High Voltage Apparatus

基　　金：国网内蒙古东部电力有限公司科技资助项目(SGMDJX00YJJS2000630)。

摘　　要：气体绝缘电气设备使用SF_(6)/CF_(4)混合气体可以避免SF_(6)气体液化,适合在极寒地区应用。为获得设备内部存在尖端放电缺陷时SF_(6)/CF_(4)混合气体的绝缘性能受温度的影响,采用尖板电极模拟缺陷尖端放电,开展SF_(6)/CF_(4)混合气体在0.1~0.7 MPa气压范围和-50~20℃温度范围的工频放电实验。结果表明,不同温度下SF_(6)/CF_(4)混合气体的击穿电压随气压升高均出现先升高—再降低—再升高的驼峰趋势;但随着温度降低,驼峰峰值处的击穿电压随温度降低出现降低趋势,而在非驼峰峰值处的击穿电压随温度降低而基本不变。通过分析温度对电晕空间电荷的影响,解释了SF_(6)/CF_(4)混合气体的击穿电压在不同气压下受温度的影响机制。The use of SF_(6)mixed gas in gas insulated electrical equipment can prevent the liquefaction of SF_(6) gas,which is mainly used in extremely cold conditions.In order to obtain the law that the discharge characteristics of SF_(6)/CF_(4gas) mixture are affected by temperature when there are tip defects in the equipment,the needle plate electrode is used to simulate the tip defects,and the power frequency discharge tests of SF_(6)/CF_(4)gas mixture at different pressures and temperatures are carried out.It is found that the breakdown voltage of SF_(6)/CF_(4) gas mixture shows an increase-decrease-increase,namely hump curve,with the increase of pressure 0.1-0.7 MPa and in the temperature range of-50-20℃.With the decrease of temperature,breakdown voltage at the hump peak decreases with the decrease of temperature,while the breakdown voltage at non-hump peak basically remains unchanged.By analyzing the effect of temperature on space charge,the mechanism that the breakdown voltage of SF_(6)/CF_(4) gas mixture is affected by temperature at different pressure is explained.

关 键 词：SF_(6)/CF_(4) 驼峰曲线 尖端放电 绝缘缺陷 温度效应 

分 类 号：TM213[一般工业技术—材料科学与工程]