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首页> 外文期刊>Power Engineering Review, IEEE >Extended Values for Geometric Factor of External Thermal Resistance of Cables in Duct Banks
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Extended Values for Geometric Factor of External Thermal Resistance of Cables in Duct Banks

机译:风管排中电缆外部热阻几何因子的扩展值

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摘要

In the Neher-McGrath analysis for calculating the external thermal resistance between cables in duct banks and ambient earth, approximate formulas for the geometric factor of the duct bank are employed which are valid only for a limited range of the height/width ratio of the cable bank. This limitation poses difficulties for power cable engineers when calculating external thermal resistances of some cable systems. This paper describes an efficient finite-element-based technique for calculating geometric factors for extended ranges of the height/width ratio and presents results for a wide range of values in a direct tabular and graphical format suitable for conventional Neher-McGrath calculations.
机译:在Neher-McGrath分析中,用于计算导管组中的电缆与周围大地之间的外部热阻时,采用导管组的几何因子的近似公式,这些公式仅在电缆的高/宽比的有限范围内有效银行。该限制给电力电缆工程师在计算某些电缆系统的外部热阻时带来困难。本文介绍了一种有效的基于有限元的技术,可用于计算高/宽比的扩展范围的几何因子,并以适用于常规Neher-McGrath计算的直接表格和图形格式,提供了范围广泛的值结果。

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