电压暂降对单相V/V牵引变压器的影响  

Impact of voltage sag on V/V traction transformers

作　　者：李华伟[1] 范瑜[1] 

机构地区：[1]北京交通大学电气工程学院,北京100044

出　　处：《北京交通大学学报》2011年第2期82-87,共6页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家自然科学基金资助项目(60776830);教育部博士点基金项目资助(2009009110025);北京交通大学基本科研业务费项目资助(2011JBM112)

摘　　要：基于EMTDC/PSCAD中UMEC变压器模型,研究电压暂降对V/V接线牵引变压器的影响机理,结果表明,电压暂降使变压器产生励磁涌流,电压暂降的时刻决定非周期分量磁通的大小,该值决定铁心的饱和与否,从而决定变压器励磁涌流是否发生.该时刻磁通的正负将影响涌流的正负.电压暂降持续时间对涌流的大小产生一定的影响,其值在1.2~1.8 p.u.之间变化.变压器有载运行时,电压暂降也将激发出变压器励磁涌流.The impact of voltage sag on properties of traction transformers with v/v connection is studied.The research is conducted on the United Magnetic Equivalent Circuit（UMEC） transformer model in EMTDC/PSCAD.We show that voltage sags will result in inrush current when voltage restores;voltage sag instant will affect the value of non-periodic flux,which can determine whether transformer core saturates or not,and accordingly determine whether inrush occurs or not;the sign of non-periodic flux will affect the positive or negative value of inrush.Meanwhile,the sag duration will also affect values of inrush after voltage restores,which varies from 1.2～1.8 p.u..We also proof that under transformer load operation,voltage sags can also produce inrush.

关 键 词：电磁暂态 变压器模型 电压暂降 励磁涌流 

分 类 号：U264.3[机械工程—车辆工程]