500 kV变压器空载过励磁下的损耗与温升特性仿真研究  

Simulation Research on Loss and Temperature Rise Characteristic of 500 kV Transformers Under No-Load Over-Excitation

作　　者：周帅 王建民[2] 刘玉芝 赵峰[2] 冯鹤超 杜振斌 ZHOU Shuai;WANG Jian-min;LIU Yu-zhi;ZHAO Feng;FENG He-chao;DU Zhen-bin(School of Electrical and Electronic Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Hebei Province Key Laboratory of Electromagnetic and Structural Performance of Power Transmission and Transformation Equipment,Baoding Tianwei Baobian Electric Co.,Ltd,Baoding 071056,China)

机构地区：[1]石家庄铁道大学电气与电子工程学院,河北石家庄050043 [2]保定天威保变电气股份有限公司,河北省输变电装备电磁与结构性能重点实验室,河北保定071056

出　　处：《电工电气》2023年第10期42-48,共7页Electrotechnics Electric

基　　金：河北省重大科技项目(V1654586652445)。

摘　　要：为了研究变压器空载过励磁下的铁心损耗和温升特性,针对某500 kV单相油浸式变压器,在对其进行低倍过励磁试验的基础上,分析了不同运行条件对激磁电流的影响;应用有限元仿真软件,建立变压器磁场-温度场耦合的仿真模型,并计算了不同倍数过励磁工况对变压器铁心热点温升的影响。试验和仿真结果表明,随着过励磁倍数的增加,变压器铁心损耗和热点稳态温升也在增加,在1.15倍及以上过励磁时,铁心热点稳态温升超过规定限值,变压器不可长期运行。In order to analyze core loss and temperature rise characteristic of transformers under no-load over-excitation,the paper,based on the low times over-excitation test of a 500 kV single-phase oil-immersed transformer,analyzes the effects of different operating condi-tions on magnetizing current.First,the finite element simulation software is adopted to build a transformer magnetic field-temperature field coupling model.Then,the effects of over-excitation with different times on hot spot temperature rise of the transformer core are calculat-ed.According to the test and simulation results,the core loss and hot spot steady temperature rise of transformers increases as the time of over-excitation rises.When the over-excitation is 1.15 times and above,hot spot steady temperature rise of the core can exceed the specified limit,and the transformer cannot run for a long time.

关 键 词：电力变压器 空载过励磁 场路耦合法 磁场分布 热点温升 

分 类 号：TM411.1[电气工程—电器]