用“场-路”结合法分析多分裂式机车变压器运行特性  

Analysis of Operating Characteristics of Locomotive Transformer with Split-type Windings Using Field-circuit Combined Method

作　　者：李晓松[1] 李勇 刘小鹏 李亚男 LI Xiaosong;LI Yong;LIU Xiaopeng;LI Yanan(Hunan Province Key Laboratory of Intelligent Power Grid Operation and Control,Changsha University of Science and Technology,Changsha 410004,China;TBEA Hengyang Transformer Co.,Ltd,Hengyang 421007,China)

机构地区：[1]长沙理工大学湖南省智能电网运行与控制重点实验室,长沙410004 [2]特变电工衡阳变压器有限公司,衡阳421007

出　　处：《电力系统及其自动化学报》2018年第7期59-64,共6页Proceedings of the CSU-EPSA

基　　金：湖南省战略新兴产业科技攻关资助项目(2016GK4038)

摘　　要：运行于双流制下的电气机车,其变压器在直流供电时用作电抗器,为此,在设计上可能要降低用作变压器的部分技术指标。应用"场-路"结合法分析了一台运行于双流制下的四分裂式变压器用作变压器时的有关特性,即在磁场分析的基础上计算变压器多个绕组的电感矩阵,并用求解电路的方法计算多个工况下的高压绕组各支路电流分配关系及短路阻抗。分析表明:短路阻抗亦与厂方设计值较接近;与单一供电制式下仅用作变压器时比较,单个低压绕组运行时与之耦合最紧;多个绕组电感矩阵计算的正确性由变压器用做电抗器时的电感实测值得到验证;密高压绕组支路的电流分配系数略小。In the electrified locomotive powered by AC and(or)DC supply,its transformer can also be used as a filter reactor under DC supply.Therefore,part of the transformer’s technical indicators may be decreased.In this paper,some operating characteristics of a locomotive transformer with four-split-type windings are studied using a field-circuit combined method:first,the inductance matrix that indicates the electromagnetic coupling among different branches of transformer windings is calculated based on the analysis of magnetic field;then,some current distributions on different branches of high-voltage windings and the short-circuit impedances are calculated by solving circuit equations in different operating conditions.The analysis indicates that the short-circuit impedance agrees well with the design value by the manufacturer;compared with the single-current power-supply mode in which only the transformer functions(i.e.,not as a reactor),the most current centralizes in the branch that is electromagnetic-coupled tightly with one single low-voltage winding;the inductance matrix is verified by the measured value of inductance when the transformer is used as a reactor;the current distribution coefficient on the branch with dense windings is relatively smaller.

关 键 词：双流制供电 分裂式变压器 运行特性 “场-路”结合法 

分 类 号：TM411[电气工程—电器]