HVDC中直流偏磁电力变压器叠片铁心损耗及磁通分布  

Loss and Flux Distribution of Power Transformer Laminated Core Under DC-biased Magnetization Condition in HVDC

作　　者：赵志刚[1] 刘福贵[1] 程志光[2] 颜威利[1] 刘兰荣[2] 张俊杰[2] 范亚娜[2] 

机构地区：[1]河北省电磁场与电器可靠性省部共建重点实验室,河北工业大学,天津300130 [2]保定天威集团技术中心,保定071056

出　　处：《高电压技术》2010年第9期2346-2351,共6页High Voltage Engineering

基　　金：国家自然科学基金(50677016);河北省自然科学基金(E2006001036)~~

摘　　要：为了研究高压直流输电系统中直流偏磁电力变压器叠片铁心中的损耗及磁通分布,提出并研制了完全按照电力变压器铁心的标准设计和叠装工艺制作的叠片铁心模型。通过模型实验获得了叠片材料在不同偏置磁场作用时的损耗曲线,解决了直流偏磁条件下叠片铁心三维电磁场数值计算中所需要的材料性能数据问题。考察了不同偏置磁场作用下变压器铁心取向硅钢片中的损耗和磁通分布,研究不同偏置磁场强度对取向硅钢片特性的影响,提出解决计算三维非线性和各向异性涡流问题的实用措施。研究表明,不同偏磁工况下模型铁损和磁通的计算结果和测量结果具有较好一致性,所得结果和结论有助于通过优化设计来提高电力变压器的性能指标。In order to study the iron loss and magnetic flux distribution of the power transformer laminated core under DC-biased magnetization working condition in HVDC,a laminated core model of product level was proposed and prototyped.The loss curves under different biased magnetic strength of the ferromagnetic material which were necessary for the 3D electromagnetic analysis had been measured based on the core model.The different electromagnetic behavior of the laminated magnetic steel under the DC-biased magnetization was also examined.The effect of the DC-biased magnetic strength on both the iron loss and flux inside the laminated grain-oriented silicon steel sheets were investigated in detail.Some practical engineering-oriented approaches were proposed to solve the nonlinear and anisotropic eddy current problems under different DC-biased excitation.All the calculated and measured results of both iron loss and flux for different test cases are practically in good agreement.These are of important significance in improving the performance of power transformers by optimizing design.

关 键 词：电力变压器 叠片铁心模型 取向硅钢片 直流偏磁 铁损 磁通 

分 类 号：TM41[电气工程—电器]