Research on the calculation of temperature field of typical ±800kV valve hall fitting

The rated transmission voltage of HVDC transmission project has reached 800kV, when transfer capacity to 10000MW, rated current will be upgraded from 5000A to 6250A. This will cause the local temperature of fittings being very high; therefore studying the reliability of existing fitting after capacity enhanced is very necessary. In this paper, a two-way suspension fitting is taken for the research object, thermal-electric coupled field is used for the finite element method (FEM). In the case of the rated current is 5000A, when the contact resistance takes different values and change the material properties of the strands of the fitting, obtain the temperature distribution. It also test this existing fitting with the reliability after capacity enhanced. The above researches are of certain significance to reduce the local temperature rise of the valve hall fittings and provide the basis for the design of HV valve hall fittings.