多绕组变压器复合短路阻抗的求解方法

给出了复合短路阻抗的定义 ;提出了求解单相多绕组变压器复合短路阻抗的方法 :用常规的方法准确计算变压器所有两绕组间的短路阻抗 ;用论文中推导的公式计算变压器的导纳矩阵 ;利用各种短路工况所决定的端口条件 ,求解由上述导纳矩阵决定的多绕组变压器电压与电流关系线性方程组 ,获得变压器各绕组的电压、电流 ;利用这些已知的电压、电流 ,最后求得短路工况所决定的变压器复合短路阻抗。以我国最近研制成的 30 5km/h的高速电力机车主变压器为例 ,给出了各种复合短路阻抗的计算值和试验值。结果表明论文所提出的方法是正确的 ,有实用价值

The Method Solving Composite Short-circuit Impedance of Multi-winding Transformer

This paper first presents the definition of the composite short circuit impedance of multi winding transformer,and then its solving methods:accurately calculating the short circuit impedances for all double winding in the multi winding transformer with normal method;calculating the admittance matrix of the multi winding transformer with the formula derived in this paper;solving the linear equation set related voltage and current by the terminal conditions in each operating mode,which is determined by the admittance matrix and obtaining all values of voltage and current of all windings;finally acquiring the composite short circuit impedance of the multi winding transformer in the short circuit operating mode with the known voltage and current For an example,the paper also presents the calculating and experimental results of a main transformer for the 305km/h high speed electric locomotive The result indicates that the contributed method in this paper is correct and available