To overcome the technical defects of calculation efficiency and discretization accuracy in the numerical simulation of the temperature field and the oil flow field in the transformer by using structured mesh and unstructured mesh

a three-dimensional model for a single-phase test transformer was divided by using polyhedral mesh technology to calculate the temperature field and the oil flow field of the transformer under different load factors. In addition

in order to verify the simulation model

the tests for transformer temperature rise test were performed. The results show that

compared with the unstructured mesh

polyhedral mesh can greatly reduce the number of cells in the same basic size

which is 1/3 of tetrahedral mesh. The convergence time and the occupied computer memory are 1/9 and 1/2 of the tetrahedral mesh

respectively. Besides

the distribution of the temperature field and oil flow field is realistic and reliable. The comparison between the numerical results and measured values shows that the effectiveness and accuracy of polyhedral mesh in the numerical simulation of the temperature field and the oil flow field of the transformer

which provides a new idea and reference for the three-dimensional numerical calculation and mesh generation of large power transformers.