E3S Web Conf.
Volume 185, 20202020 International Conference on Energy, Environment and Bioengineering (ICEEB 2020)
|Number of page(s)||5|
|Section||Energy Engineering and Power System|
|Published online||01 September 2020|
The thermal inertia time constants and its influencing factors in the thermal dynamic process of overhead line and cable
1 State Grid Shandong Electric Power Company, Jinan Shandong, 250021 China
2 Liaocheng Power Supply Company of State Grid Shandong Electric Power Company, Liaocheng Shandong, 252000 China
3 Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education, Shandong University, Jinan, Shandong 250061 China
* Corresponding author’s e-mail: firstname.lastname@example.org
Due to the existence of thermal capacity, the conductor temperature of overhead line and cable changes later than current steps (thermal inertia), and the thermal dynamic process of the conductor contains the huge current-carrying potential. As an important symbol of thermal dynamic process, the thermal inertia time constant is of great significance to describe the characteristics of thermal dynamic process accurately. In this paper, the thermal inertia time constants of overhead line and cable and its influencing factors are studied based on the heat balance models, which can be solved by the fourth order Runge-Kutta method. Then the four factors including the current step, ambient temperature, wind speed and global radiation intensity are used to explore their influence on the thermal inertia time constant of overhead line, and the current step and soil temperature on cable. The numerical results show the effects of influencing factors on the thermal inertia time constant and provide a theoretical basis for a more detailed evaluation of the thermal dynamic process.
© The Authors, published by EDP Sciences, 2020
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