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http://dx.doi.org/10.5370/JEET.2018.13.6.2402

Analysis on Temperature Distribution and Current-Carrying Capacity of GIL Filled with Fluoronitriles-CO2 Gas Mixture  

Chen, Geng (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University)
Tu, Youping (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University)
Wang, Cong (Beijing Key Laboratory of High Voltage & EMC, North China Electric Power University)
Cheng, Yi (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University)
Jiang, Han (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University)
Zhou, Hongyang (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University)
Jin, Hua (School of Control and Computer Engineering, North China Electric Power University)
Publication Information
Journal of Electrical Engineering and Technology / v.13, no.6, 2018 , pp. 2402-2411 More about this Journal
Abstract
Fluoronitriles-$CO_2$ gas mixtures are promising alternatives to $SF_6$ in environmentally-friendly gas-insulated transmission lines (GILs). Insulating gas heat transfer characteristics are of major significance for the current-carrying capacity design and operational state monitoring of GILs. In this paper, a three-dimensional calculation model was established for a GIL using the thermal-fluid coupled finite element method. The calculated results showed close agreement with experimentally measured data. The temperature distribution of a GIL filled with the Fluoronitriles-$CO_2$ mixture was obtained and compared with those of GILs filled with $CO_2$ and $SF_6$. Furthermore, the effects of the mixture ratio of the component gases and the gas pressure on the temperature rise and current-carrying capacity of the GIL were analyzed. Results indicated that the heat transfer performance of the Fluoronitriles-$CO_2$ gas mixture was better than that of $CO_2$ but worse than that of $SF_6$. When compared with $SF_6$, use of the Fluoronitriles-$CO_2$ gas mixture caused a reduction in the GIL's current-carrying capacity. In addition, increasing the Fluoronitriles gas component ratio or increasing the pressure of the insulating gas mixture could improve the heat dissipation and current-carrying capacity of the GIL. These research results can be used to design environmentally-friendly GILs containing Fluoronitriles-$CO_2$ gas mixtures.
Keywords
Gas-insulated transmission line; Fluoronitriles-$CO_2$ gas mixture; Thermal field calculation; Current-carrying capacity;
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