Abstract
AbstractThe insulation performance of SF6 insulated high voltage direct current apparatus are often analysed in a pure electric field or electro‐thermal coupled field while the fluid behaviour of SF6 gas flow is often ignored. However, frequent flashover along the support insulators inside the SF6 insulated wall bushing indicates that the fluid characteristics of SF6 may have considerable influence on the interior insulation performance of the bushing. This paper has simulated the thermo‐fluid coupled field in the SF6 insulated wall bushing based on the finite element method model. The result shows that buoyant flow of SF6 has evident influence on the temperature distribution in the bushing. On this basis, the effect of the thermo‐fluid field on the electric field distribution along the insulator as well as on the motion behaviour of the metallic particles is analysed. Furthermore, the effect of different thermal boundary conditions on analysis of the multi‐physics field in the bushing is discussed and the most suitable one for simulation and experiment is suggested. Comparisons are made between different supporting structures and modification advices are proposed. This paper can serve as a good reference for subsequent research studies on SF6 insulated apparatus in which the temperature gradient or the motion of the micro‐sized metallic particles shall be considered.
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