Fast Calculation Method of Magneticfield in Transformer Core Based on Magnetic Circuit Modeling

Transformer is an important electromagnetic equipment in power system, the real-time monitoring of its status is very important for the safe and stable operation of power grid. At present, finite element software is usually used to calculate the core magnetic field, but it takes a long time to calculate because of the large number of meshes, and it is difficult to meet the requirement of real-time monitoring of transformer status. In order to solve this problem, a modeling method of transformer core magnetic circuit considering the distribution of rotating flux in corner and T-zone is proposed. In this method, the core is divided into several magnetic circuit segments, and each magnetic circuit segment is finely divided to meet the requirement of calculation accuracy. In solving the model, the nonlinear equations of magnetic flux in the core loop are established by using the electromagnetic duality relation, and the equations are solved by piecewise spline interpolation of BH curve, which speeds up the solving speed of the magnetic field. Finally, the transformer model is established by finite element simulation software, and the effectiveness of the proposed calculation method is verified by comparing with the simulation results.