摘要
采用SF6/N2混合气体绝缘介质的气体绝缘金属封闭输电线路(GIL)作为电缆和架空线的有效补充,将在电力发展中起到重要作用。为更好地理解其放电特性,建立了同轴电场中流注电晕放电的二维流体模型,综合考虑了SF6/N2混合气体放电过程中空间光电离与阴极光发射作用,采用有限元-通量校正传输法(FEM-FCT)求解。仿真表明:流注电晕对空间电场有均匀作用,外施电压幅值低时流注电晕经过一段时间后会消失,幅值高时流注电晕容易发展为不稳定放电;SF6/N2混合气体起始放电时间较SF6气体迟,但绝缘性能较差;空间光电离作用强于阴极光发射的作用。
The use of gas-insulated transmission line as an effective supplement for cables and overhead lines will play an important role in power development. The fluid method is used to analyze streamer corona discharge mechanism in coaxial gap in SF6/N2 gas mixtures which is the future alternative for pure SF6. The finite element-flux corrected transport technique （FEM-FCT） based on the unstructured mesh is used to solve continuity equations for e- lectrons, positive ions, and negative ions. The finite element method （FEM） is used to solve Poisson electric field distortion caused by space charge. 2-dimensional simulations of streamer corona discharge process in SF6/N2 gas mixtures between coaxial electrodes are achieved. The results show that electric field is balanced by streamer corona, and streamer corona will disappear after a period of time with low applied voltage. Less time is needed to form streamer corona in SF6 than 50% -50% SF6/N2 gas mixtures. The effect of pbotoionization is stronger than photoemission.
出处
《电工电能新技术》
CSCD
北大核心
2014年第7期49-54,共6页
Advanced Technology of Electrical Engineering and Energy
基金
教育部新世纪优秀人才支持计划(NCET-11-130)
高等学校博士学科专项科研基金(20120161110009)
甘肃省电力公司2012年度科技资助项目(2012101027)
