The expression for short-circuit electrodynamic force of rectangular bus bars on the basis of the calculation of three-phase symmetry short-circuit current was fi.
本文首先根据系统发生三相对称短路时的短路电流，给出了三相矩形母线短路电动力的解析表达式。
2
Then, based on the symmetry of magnetic circuit of large power equipments, its simplified mathematical model of magnetic forces is discussed.
然后，基于电力设备磁路的对称性给出其磁场力简化数学模型；
3
For isolated-type symmetry half-bridge bidirectional converter with phase-shifted control, a simplified circuit under 4 modes using the primary windings of transformer as reference object is built.