Simulation Study on Temperature Rise Characteristics of 550 kV/8000 A Combined Electrical Apparatus

With the rapid development of national industry, the demand for power energy in all walks of life is increasing, which poses a major challenge and huge demand for the safe and stable operation of the power system. 550 kV/8000 A combined electrical appliances are representative of large-capacity power switchgear in the power system. The safe and stable operation of GIS is the key to the normal operation of power system. It is of practical significance to study the thermal distribution characteristics of GIS for improving the reliability and security of power system. This paper establishes an electromagnetic thermal coupling model for 550 kV/8000 A combined electrical appliance. Through multi-physical field coupling, electromagnetic loss is calculated and input into the thermal field as a load to calculate the temperature distribution. The results show that the contact resistance between the highest point of temperature rise and the intermediate conductor and the contact base is in line with the national standard, which provides a reference for the future optimization design of the product.