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首页> 外文期刊>Power Delivery, IEEE Transactions on >Thermal Analysis of Power Cables in Free Air: Evaluation and Improvement of the IEC Standard Ampacity Calculations
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Thermal Analysis of Power Cables in Free Air: Evaluation and Improvement of the IEC Standard Ampacity Calculations

机译：自由空气中电缆的热分析：IEC标准载流量的评估和改进

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摘要

The thermal behavior of cables installed in free air depends upon physical parameters, such as surface emissivity, heat dissipation coefficients for radiation and natural convection, as well as induced heating from neighboring heat sources that depend on the configuration in which the cables are grouped. The IEC standard method for rating cables installed in free air considers all of these physical properties implicitly and only for particular conditions. In this paper, the IEC standard method for rating power cables installed in free air is evaluated against finite-element method simulations and laboratory experiments. A scientifically sound and accurate thermal-electric circuit for the calculation of the steady-state temperature of cables in air is derived from first thermodynamic principles. The model parameters are computed explicitly from the physical properties of the cable, cable grouping, and environment. Through numerous finite-element simulations, as well as laboratory experiments, the accuracy of the proposed method has been established.
机译：安装在自由空气中的电缆的热性能取决于物理参数，例如表面辐射率，辐射和自然对流的散热系数，以及来自相邻热源的感应加热，这些热量取决于电缆的分组配置。 IEC标准方法对自由空气中安装的电缆进行定额评估时，隐含地且仅在特定条件下才考虑所有这些物理特性。在本文中，针对有限空气中安装的电力电缆的IEC标准方法通过有限元方法模拟和实验室实验进行了评估。从第一热力学原理中得出了一种科学合理，准确的热电回路，用于计算空气中电缆的稳态温度。根据电缆的物理属性，电缆分组和环境明确计算模型参数。通过大量有限元模拟以及实验室实验，验证了该方法的准确性。

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