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Electromagnetic Characteristic Calculation of Several Parallel Coils for High Current Transformer Based on Field-Circuit Coupling Method

The three-dimensional (3-D) calculation model of FEM coupling with the equivalent electric-circuit (EEC) is established for a test transformer of several parallel coils. Numerical analyses of 3-D magnetic fields, branch currents, additional loss, etc., in coils are carried out by using field-circuit coupling method (FCCM). The validity of the calculated results is verified by comparing with measured value of test transformer. Some distribution rules of electromagnetic characteristics are given for design of high current transformer.