考虑直流偏磁的变压器绕组电动力计算
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摘要
二维有限元模型在计算变压器绕组电动力时往往选取绕组的某一剖面,利用绕组漏感分布的空间对称性达到求解的目的。但发生直流偏磁时,绕组漏感空间分布明显不对称,二维有限元模型难以精确求解。为精确计算直流偏磁发生时变压器绕组电动力,基于AnsysMaxwell建立变压器直流偏磁时的三维有限元模型,通过与二维有限元模型计算结果对比,发现三维有限元模型在计算直流偏磁时绕组电动力方面更为精确。
Two-dimensional finite element model is often used to select a section of winding in the calculation of the electromotive force of the transformer winding. The purpose of solving is to solve the problem by using the spatial symmetry of the leakage inductance of the winding. However, when the DC bias is applied, the spatial distribution of the leakage inductance in the winding is obviously asymmetric and the two-dimensional finite element model can not be accurately solved. In order to accurately calculate the electromotive forces of transformer windings when DC bias occurs, a three-dimensional finite element model of transformer DC bias is established based on Ansys Maxwell. Comparing with the calculation results of two-dimensional finite element model, it is found that when the three-dimensional finite element model Winding electrodynamic more precise.
Two-dimensional finite element model is often used to select a section of winding in the calculation of the electromotive force of the transformer winding. The purpose of solving is to solve the problem by using the spatial symmetry of the leakage inductance of the winding. However, when the DC bias is applied, the spatial distribution of the leakage inductance in the winding is obviously asymmetric and the two-dimensional finite element model can not be accurately solved. In order to accurately calculate the electromotive forces of transformer windings when DC bias occurs, a three-dimensional finite element model of transformer DC bias is established based on Ansys Maxwell. Comparing with the calculation results of two-dimensional finite element model, it is found that when the three-dimensional finite element model Winding electrodynamic more precise.
引文
[1]薛向党,郭晖,郑云翔等.地磁感应电流对电力变压器危害的研究[J].电力系统及其自动化学报,1999,11(2):13-19.
[2]郑涛,陈佩璐,刘连光等.计及直流偏磁的电流互感器传变特性对差动保护的影响[J].电力系统自动化,2012,36(20):89-93.
[3]路长柏,朱英浩.电力变压器计算[M].哈尔滨:黑龙江科学技术出版社,1990.
[4]李晓萍,文习山,陈慈萱.单相变压器直流偏磁励磁电流仿真分析[J].高电压技术,2005,31(9):8-10.
[5]钟连宏,陆培均,仇志成等.直流接地极电流对中性点直接接地变压器影响[J].高电压技术,2003,29(8):12-13,28.
[6]赵志刚,刘福贵,张俊杰等.直流偏磁条件下变压器励磁电流的实验与分析[J].电工技术学报,2010,25(4):71-76.
[7]季,罗隆福,许加柱,李勇.变压器热一磁三维有限元计算[J].电力系统及其自动化学报,2007,(1):96-99.
[8]李泓志,崔翔,卢铁兵等.变压器直流偏磁的电路磁路模型[J].中国电机工程学报,2009,(27):119-125.
[9]朱林,韦晨,余洋.单相变压器的直流偏磁励磁电流问题及其对保护的影响分析[J].电力系统保护与控制,2010,38(24):158-162.
[10]徐志,李胜男,于辉.变压器直流偏磁时的绕组振动研究[J].变压器,2015,(52):48-51.
[2]郑涛,陈佩璐,刘连光等.计及直流偏磁的电流互感器传变特性对差动保护的影响[J].电力系统自动化,2012,36(20):89-93.
[3]路长柏,朱英浩.电力变压器计算[M].哈尔滨:黑龙江科学技术出版社,1990.
[4]李晓萍,文习山,陈慈萱.单相变压器直流偏磁励磁电流仿真分析[J].高电压技术,2005,31(9):8-10.
[5]钟连宏,陆培均,仇志成等.直流接地极电流对中性点直接接地变压器影响[J].高电压技术,2003,29(8):12-13,28.
[6]赵志刚,刘福贵,张俊杰等.直流偏磁条件下变压器励磁电流的实验与分析[J].电工技术学报,2010,25(4):71-76.
[7]季,罗隆福,许加柱,李勇.变压器热一磁三维有限元计算[J].电力系统及其自动化学报,2007,(1):96-99.
[8]李泓志,崔翔,卢铁兵等.变压器直流偏磁的电路磁路模型[J].中国电机工程学报,2009,(27):119-125.
[9]朱林,韦晨,余洋.单相变压器的直流偏磁励磁电流问题及其对保护的影响分析[J].电力系统保护与控制,2010,38(24):158-162.
[10]徐志,李胜男,于辉.变压器直流偏磁时的绕组振动研究[J].变压器,2015,(52):48-51.