Simulation and Verification of Magnetic Field Distribution in Transformer Oil Tank Based on Finite Element Method

As the key equipment in power transportation, the related characteristics of transformer in operation are the focus of transformer monitoring and protection. The existing research on the magnetic field distribution characteristics of transformer focuses on the inside of transformer tank. However, due to the poor electromagnetic environment inside the transformer, considering the influence of insulation performance, there are few studies on the magnetic field distribution characteristics of the sensor installed inside, while the outside does not need to consider the influence of insulation and only needs to consider the magnetic shielding. Therefore, this paper chooses the finite element method to simulate the magnetic field distribution in the oil tank of 110 kV transformer under three operating conditions: normal operation state, winding deformation state, inter-turn short circuit state.. The simulation results are tested and verified in practical engineering, which provides a theoretical basis for evaluating the operating state of transformer by measuring the magnetic field outside the oil tank of transformer.