Trench laying cables are often used at inlet and outlet regions of a power distribution cabinet. In order to improve the heat transfer performance and extend service life of a trench laying cable, the heat transfer and cable ampacity of the trench laying cable with a ceramic plate were numerically studied in the present paper and the results were compared with those of a traditional trench laying cable. The variations of conductor loss and eddy current loss of different loop cables were discussed in the trench with a ceramic plate, and the effects of ceramic plate parameters on heat transfer performance of the trench laying cable were optimized using the Taguchi method. It is found that for the trench with ceramic plates, although the ceramic plate restrains the natural convection in the trench, the total heat transfer for natural convection and thermal radiation are enhanced for the cables and the cable ampacity can be improved. The difference of electromagnetic loss between the upper- and lower-layer cables in the trench with ceramic plate is quite small. When the cable core current (I) increases from 700 A to 1100 A, the maximum difference of averaged electromagnetic loss between the upper- and lower-layer cables is 1.22%. With the Taguchi method, an optimum parameter combination is obtained. When the length, thickness, and surface emissivity of the ceramic plate are equal to 0.48 m, 0.0734 m, and 0.8, respectively, at I = 900 A, the cable maximum temperature in the trench is the lowest.

中文翻译：

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陶瓷板槽敷设电缆传热数值研究及优化设计

沟槽敷设电缆通常用于配电柜的入口和出口区域。为提高地沟敷设电缆的传热性能，延长其使用寿命，本文对带陶瓷板的地沟敷设电缆的传热和电缆载流量进行了数值研究，并将研究结果与传统电缆进行了比较。沟渠敷设电缆。用陶瓷板讨论了沟槽内不同回路电缆的导体损耗和涡流损耗的变化，并利用田口法优化了陶瓷板参数对沟槽敷设电缆传热性能的影响。发现对于带有陶瓷板的沟槽，虽然陶瓷板抑制了沟槽内的自然对流，增强了电缆的自然对流和热辐射的总热量传递，提高了电缆载流量。陶瓷板沟内上下层电缆的电磁损耗差异很小。当电缆芯电流（I ) 从 700 A 增加到 1100 A，上层和下层电缆之间平均电磁损耗的最大差异为 1.22%。使用田口方法，可以获得最佳参数组合。当陶瓷板的长度、厚度和表面发射率分别等于 0.48 m、0.0734 m 和 0.8 时，在I  = 900 A 时，电缆沟内的最高温度最低。