摘要
通过对重庆某坝变电站35 kV电网三相对地电容不平衡问题的分析,得出其带消弧线圈运行时,消弧线圈的整定不能同时兼顾三相电压的平衡和单相接地时消弧线圈的消弧作用的结论;提出了山区35 kV电网新的中性点运行方式,即在系统正常运行时中性点不接地,在发生单相短路接地时中性点经消弧线圈接地,并对这种中性点新型运行方式的暂态过程进行了大量数值模拟计算,得出了暂态过程中过电压和冲击电流水平.在重庆地区和贵州地区的试验表明,这种新型中性点运行方式对减低山区35 kV电网雷击跳闸率,提高其防雷运行水平是有效和可行的.
The unbalanced nature of 35 kV distribution system due to capacity values is difficult in neutral operation, which can not meet the demand of voltage balance in static state and arc distinct in fault. This paper proposes a new neutral operation as neutral insulation in static state and resonance grounding in fault , along with EMTP simulation acts. Simulation indicates that new neutral operation method can improve lightning withstand level and decrease trip-out rate of grids.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第5期40-43,共4页
Journal of Chongqing University
基金
重庆大学骨干教师基金资助项目
