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移相变压器可实现电网潮流的灵活控制,其负荷情况复杂多变且负载电流的大小与负载侧电压的相位差变化较大,有载分接开关作为移向变压器相位调节的关键组件,其档位调节过程中所需开断的级电压大小与负载条件密切相关.该文基于对称双芯移相变压器的工作原理及运行特性,结合负载条件下有载分接开关级电压的计算公式,分析了包括负载电流的大小、负载电压与负载电流的相位差以及移相变压器做超前与滞后调节在内的不同负荷条件对级电压大小的影响,得出了励磁变压器二次侧电压的变化规律,提出最大级电压的计算方法.通过实例计算与Matlab/SIMULINK仿真结果的对比,验证了所提最大级电压计算方法的可行性和准确性.“,”The flexible control of power flow can be realized by the phase-shifting transformer, whose load conditions are complicated and the phase angle difference between the load side voltage and the load current will vary greatly. The on-load tap changer is a key component for the phase angle adjustment. The required breaking step-voltage of it is closely related to the on-load conditions in the process of shifting positions. Based on the working principle, operational characteristics and the calculation formula of the step-voltage under on-load conditions of the two-core phase-shifting transformer, this paper analyzed the effects of different load conditions including the load current, phase angle difference between the load voltage and load current and different operation modes on the step-voltage of the phase-shifting transformer. The changing regularity of the secondary side voltage of the exciting transformer is achieved and a novel method for calculating the maximum step-voltage is proposed. By analyzing two specific examples, the feasibility and accuracy of the method were verified by comparing the calculation results with the Matlab/SIMULINK simulation model.