中文摘要：

电力变压器短路故障产生的短路冲击会造成绕组变形,限制系统短路电流对降低变压器绕组动态变形意义重大。文中以110 kV电压等级的三绕组电力变压器为例,中压绕组发生出口短路故障时,基于磁—力学耦合场研究方法,对变阻抗变压器和常规变压器绕组动态变形进行数值分析。变阻抗变压器的研究包括变压器本体和限流电抗器2部分,分析了短路电流作用下,变压器绕组和限流电抗器线圈的变形、动态应力、位移。常规变压器和变阻抗变压器绕组变形的对比可得变阻抗变压器变形量较小。分析结果为变阻抗变压器绕组变形状态评估提供参考依据。

英文摘要：

The short-circuit impulse produced by power transformer short-circuit fault, will cause the trans- former windings deformation. Therefore, it is significant to take effective measures for the purpose of limiting short-cir-euit current to a reasonable and low level. In this paper, based on the magnetic-mechanics coupling field, the threewinding transformer of 110 kV voltage levels of windings deformation is analyzed when the three- phase short-circuit fault occurs at the location of medium-voltage winding. The variable impedance energysaving trans-former, which is composed of the main body of the transformer and the current-limiting reactor, can limit fault current when the system of short-circuit fault occurs. The dynamic deformation of the body of transformer and current-limiting reactor are analyzed, containing the stress and displacement after short-circuit fault occurs. Corn-pared with the conventional transformer, impedance transformer is smaller. The research the maximum of windings deformation and stress of variable results provide reference for the evaluation of variable impedance transformer winding deformation.