Design and validation of experimental test platform for field-circuit coupling wide-frequency characteristics model of power transformer

This paper considers the nonlinear core material, the weak magnetic effect of core eddy current and the non-measured coil load operation under the condition of wide-frequency transformer. A field-circuit coupling model suitable for the calculation of inductance parameters in wide-frequency applications such as transformer lightning impulse wave process analysis and frequency-dependent response analysis is proposed.In order to verify the correctness of the electromagnetic coupling between the coil units in the equivalent model, a test model of electromagnetic parameters was designed.The influence of the magnetic conductivity of the core on the wide-frequency inductance parameters is analyzed under the different condition.The synthetic inductance parameters were measured and compared with the calculated results to verify the validity of the proposed model.