Calculation of Magnetic Flux Leakage and Loss of 220kV Transformer Based on MAGNET Field-Circuit Coupling

Magnetic flux leakage and loss of a transformer reduce the energy conversion efficiency of the transformer, also cause abnormal temperature distribution of the transformer. Studying magnetic flux leakage and loss of a transformer through measurement is a challenging task due to the difficulty of measuring magnetic flux leakage and loss. The finite element calculation makes up for the difficulty of measuring magnetic flux leakage and loss, which is very important for analyzing the magnetic flux leakage loss of a transformer. Based on the actual parameters, a refined three-dimensional(3D) modeling of 220kV three-phase three-winding on load tap-changer oil immersed power transformer in operation is established. The field circuit coupling finite element models of tank and turret are carried out by using professional electromagnetic simulation software MAGNET. Through setting impedance boundary conditions to improve the calculation speed, the distribution of magnetic flux leakage and loss of the transformer under high and medium voltage rated operating conditions is obtained by simulation. The results show that using MAGNET field-circuit coupling analysis can be used to quickly and efficiently calculate and analyze transformer magnetic flux leakage and loss.