Research on Temperature Rise of 1100kV GIL The gallery corridor

• 1、School of Electrical Engineering, Shenyang University of Technology,Shenyang 110870

Abstract：The temperature rise calculation of gas insulated transmission lines (GIL) is of great significance for its reliability design and operation status monitoring. To establish a three-dimensional heat-flow coupled field analysis model between air and GIL, conductor and outer casing in GIL pipe gallery. The finite volume method is used to solve the steady temperature distribution of the GIL pipe gallery, and the maximum temperature of the GIL conductor and the outer casing is obtained. The changes of GIL temperature under different load currents (4000A, 5000A and 6300A) and load currents of 6300A (15 C, 19 C, 25 C, 30 C, 35 C) at soil temperature of 19 C were analyzed. The results show that the maximum temperature of GIL is 75.52 C when the load temperature is 6300A and the soil temperature is 19 C under steady state operation. At a temperature of 19 C, when the load current is 4000-6300 A, the GIL temperature rises rapidly as the load current increases. At different soil temperatures at a load current of 6300 A, the GIL temperature increases with increasing soil temperature, and the difference between the GIL conductor temperature and the shell temperature is approximately constant.

Keywords： GIL bus Temperature rise FEM