变压器的零序阻抗是继电保护元件选择和整定值计算的重要依据，是电力系统的重要参数，可用于准确计算电力系统事故状态下短路电流的零序分量。变压器零序阻抗主要受铁心结构和绕组的联结组别影响，解析法很难准确计算零序阻抗，而有限元方法可以较好地解决此问题。以YNyn0d11的三相三柱变压器为研究对象，在Ansys Maxwell中建立零序阻抗有限元场路耦合计算模型，研究了3种零序阻抗的计算方法：能量法、伏安法和电感矩阵法。基于上述模型研究了油箱及磁屏蔽建模方法对零序阻抗计算精度的影响。计算结果与变压器试验数据之间的误差在5%以内满足工程计算精度要求，验证了提出的3种计算方法的有效性。

The zero-sequence impedance or impedances of the transformers is an important basis for the selection and setting value calculation of relay protection components, and is an important parameter of power systems. It can be used to accurately calculate the zero-sequence component of short-circuit current in power system accident states. The zero-sequence impedance of transformers is mainly affected by the structure of the iron core and the connection group of the windings. Analytical methods are difficult to accurately calculate the zero-sequence impedance, while finite element methods can better solve this problem. Taking YNyn0d11 3-phase 3-leg transformer as the research object, a finite element field circuit coupling calculation model for zero-sequence impedance is established in Ansys Maxwell, and three calculation methods for zero sequence impedance are studied: energy method, volt-ampere method, and inductance matrix method. Based on the above model, the influence of fuel tank and magnetic shielding modeling methods on the accuracy of zero sequence impedance calculation is studied. The error between the calculation results and the transformer test data is within 5%, which meets the engineering calculation accuracy requirements and verifies the effectiveness of the three proposed calculation methods.