Dynamic Temperature Calculation of Gas Insulated Bus Bars

Abstract

As the key link of different voltage levels of power system, gas insulated bus bars have the important function of power transmission in large capacity. Temperature at the conductor is the highest when the bus bar gets overheat. As the conductor locates inside the metal shell, the usual thermal detection method can only measure the outer surface temperature and cannot obtain the temperature rise of the conductor inside. In this paper, a dynamic thermal analysis model of bus is proposed based on Thermal-electric analogy method. The thermal constant is calculated as the key parameter for conductor temperature prediction. An exponential function is obtained to model the temperature rise process of the conductor. The comparison between the temperature prediction results calculated by finite element model and dynamic model shows in good agreement. The research results provide theoretical basis and reference for the conductor temperature monitoring of gas insulated bus bars.