Determination method for magnetic hysteresis characteristics and depletion characteristics of transformer in DC magnetic bias state

The invention discloses a determination method for magnetic hysteresis characteristics and depletion characteristics of a transformer in a DC magnetic bias state. The determination method comprises the following steps: creating a lamination iron core model; dissecting the lamination iron core model to obtain finite elements; initializing the magnetic vector position and the electric current density of each node; under consideration of a hysteresis effect, combining the finite elements to obtain electromagnetic field result; combining a fixed point technology with a harmonic wave convergence technology to process the obtained magnetic reluctivity data of the magnetic density data; obtaining the data in one-one correspondence to the harmonic wave in sequence to form second harmonic wave data; if the second harmonic wave data do not converge, repeat such steps until the convergent second harmonic wave data is obtained. The determination method is broad in application rage, high in stability, and suitable for large-scale DC magnetic bias analysis, so as to provide important reference for power transformer production and manufacture.