Ampacity Optimization for Cluster Power Cables Laid in Ducts of Narrow Channel

doi:10.11930/j.issn.1004-9649.202003131

Abstract

Abstract: In the construction of underground power cables, it is often unavoidable to pass through areas with narrow roads or dense underground pipe networks.In order to keep a safe horizontal distance, it is common to arrange the cluster cables in a narrow underground channel, which however will lead to the ampacity decrease of underground power cables in cluster. Based on the IEC 60287, an unequal load matrix optimization method is proposed for cluster cables in narrow channels by combining the heat transfer theory with matrix theory. To verify the accuracy of the optimization method, a finite element temperature model is established for several typical cable arrangement schemes in narrow underground channels, and the temperature field simulation is performed.Finally, a suitable scheme for narrow-arranged cables is designed after comparing the ampacity of actual underground power cables before and after the underground channel is narrowed. The results show that the proposed scheme can improve the utilization rate of the power cable, and reduce the influence of the narrowed channel on ampacity of power cables. The adopted unequal load flow method for the narrow channels can improve the cable transmission capacity, and it can increase by 6.53% at maximum with the increase of the number of cables loops.

Key words: narrow channel, laid in ducts, ampacity optimization, IEC 60287, matrix theory, cables in cluster

MA Aiqing, QIN Bo, ZHANG Huafu. Ampacity Optimization for Cluster Power Cables Laid in Ducts of Narrow Channel[J]. Electric Power, 2021, 54(5): 166-173.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202003131

https://www.electricpower.com.cn/EN/Y2021/V54/I5/166

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