Numerical Calculation of Multi-Physical Field Coupling for High Voltage Basin Insulator

With requirement of high voltage and high current transmission, operation performance of basin insulators needs to be analyzed in the multi-physical coupling simulation. Electrical-thermal-mechanical performance parameters of basin insulator bulk materials are obtained through experiments. Based on the experimental data, multi-physical field finite element method for calculating electric-thermal-mechanical system is proposed. The non-linear relationship between dielectric constant, tangent value of the loss angle, the thermal conductivity and thermal expansion coefficient is taken into account in calculation of a single physical field. Three-dimensional finite element model of basin insulator is established to decouple the electric field, the temperature field and the stress field. The RBF neural network is used to learn the simulation data of the electric-thermal-mechanical multi-physical coupling field, so as to realize non-linear inversion of the optimal structural parameters of basin insulator. The application results show that the decoupling simulation of basin insulators can be realized by the multi-physical field finite element method. The maximum electric field strength of the basin body is also near the central conductor. The maximum electric field strength is 11.85 kV/mm. The maximum temperature of the basin body at the interface between the central conductor and the epoxy material at 6300A is 97 degree. Most significant displacement and stress concentration areas are mainly located at the flange side of the basin insulator. The research results of this paper can effectively guide the design of high voltage basin insulator structure, and have certain theoretical guidance value for fault diagnosis and pattern recognition of basin insulator in GIS/GIL equipment.