The Electro-Thermal Coupling Computation of Resin Impregnated Paper Oil-SF6 Immersed Bushings

The traditional consistent capacitance method is foundation of the improved design for the Oil-SF6 immersed bushings condenser. Firstly, brief introduction about traditional one has been proposed. The capacitance between adjacent foils can be consistent by adjusting radius and length of every foil, and the consistent capacitance of each layer can be introduced. Moreover, two computing technologies based on Finite Element Method (FEM) have been addressed. One is that how to couple separate electric and thermal calculation process, the other is that how to take material non-linearity into consideration in coupling process. In the paper, for the former difficulties, electro-thermal coupling method has been applied in strong interaction between electric and thermal distribution to calculated the hotspot temperature of the bushing condenser.