Calculation for surface electric field intensity of UHVDC valve hall fittings is of important guiding significance for design of valve hall and fittings. Because of more interior equipment of valve hall and more complex structure, there is a big difficulty for geometric modeling and numerical solution of valve hall. To calculate the surface electric field intensity of each fittings in the valve hall accurately, first of all, we used Pro/E to create a full-size model for valve hall, and meshed by ANSYS, then made use of PSCAD to simulate ±800 kV UHVDC transmission system. Using instantaneous loading method of electrostatic field, we obtained the voltage value of key parts as the boundary condition of surface electric field intensity calculation. Finally, we calculated the surface electric field intensity of valve hall’s fittings with Galerkin boundary element method. This method greatly reduced the meshing difficulty and calculating cost. The results show that the maximum field strength position of entire valve hall model appears in the position of phase B busbar connection at the side of low voltage for 14.7 kV/cm in this design, and does not produce corona phenomenon. The method and results of the simulation provide an important reference for design of valve hall fittings.
KEY WORDS :ultra high voltage;valve hall;fittings;field intensity calculation;converter station;boundary element method;
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