Abstract
The temperature properties of real-type direct-current gas-insulated transmission lines (DC-GIL) with a basin-type spacer were investigated by the finite element method in this paper. A horizontally installed model was established and the temperature distribution was obtained with a 3D model. The specific heat capacity and thermal conductivity of the spacer were measured and applied in the simulation. The results show that the temperature of the convex surface was slightly higher than that of the concave surface. With an increase in the SF6 pressure, the temperature of the spacer decreased, which can be attributed to the improvement of convection due to increases in the heat capacity per unit volume. With an increase in the ambient temperature, the temperature of the spacer increased linearly. The temperature difference between the inner and outer parts of the spacer increased with increases in the load current. Besides, an obvious increase in the surface electric field strength appeared under the influence of the thermal gradient compared to the results without the thermal gradient. Thus, special attention should be paid to the insulation properties of the spacer considering the influence of temperature distribution. This study evaluates both the thermal and insulation characteristics of the GIL along with the spacer under various conditions.
Highlights
Since the thermal conductivity and specific heat capacity varied with the temperature, the parameters at different temperatures were measured by the transient hot-wire method for
Where κe is the thermal conductivity of the enclosure, n is the normal vector at the inter11 of 16 face, h is the natural convection coefficient between the enclosure and the ambient air, Te and Ta are the temperatures of the enclosure and ambient air, respectively
The temperature characteristics of a horizontally installed gas-insulated transmission lines (GIL) model with a basintype spacer inside were investigated by FEM with a 3D model
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Novák et al conducted simulations dealing with the temperature distribution in a three-phase GIS busbar considering the influence of the eddy current [11]. Tu et al analyzed the temperature distribution in a GIL filled with the fluoronitriles–CO2 gas mixture and compared the result with SF6 for the development of environmentally friendly GIL [12]. All these simulations neglected the influence of the insulator on the heat transfer characteristics and the temperature distribution of the insulator. X. Du et al [14] investigated the temperature distribution of DC-GIS/GIL with a spacer inside and further discussed its influence on the surface charge properties.
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