Electric field characteristics analysis of electrified railway catenary section insulator

In order to reveal the electric field characteristics of the catenary section insulators under normal operating conditions. Based on the FEM of the electrostatic field, a simulation model for the numerical calculation of the electric field of a single insulator and an integral catenary section insulator under normal operating conditions is established. The model uses artificial truncation method to limit the air domain, setting and defining the various parameters reasonably. The results show that the overall trend of the surface potential of a single insulator and an overall section insulator is determined by the setting of the potential, and the potential rises from the low-voltage end to the high-voltage end, and vice versa. The electric field distribution is generally U-shaped. Compared with a single insulator, the electric field of an integral section insulator decreases at the high-voltage end of the insulator, rises at the low-voltage end, and changes in other parts are not obvious. When the potentials of the fittings at both ends of the integral catenary section insulator are different, the number of fittings and the model structure have a greater influence on the distribution of potential. Derived from the electric field diagram that the maximum electric field intensity of a single insulator and an integral catenary section insulator are less than the electric intensity peak of air in a uniform electric field. There will be no corona on the surface of the insulator, which meets the requirements of insulation performance. The analysis results provide theoretical basis and reference for the design, modification and comparison of insulation characteristics of section insulation.