窄通道下排管敷设电缆群负荷优化

电力管道施工过程中，有时不可避免地要经过道路狭窄或地下管网密集的区域，为了保证安全水平净距，通常将此段电缆群变更为通道较窄的布置方式，但这会导致电缆群载流能力减小。将传热学原理和矩阵论相结合，基于IEC 60287提出了一种窄通道下电缆群不等负荷的矩阵优化方案，针对几种典型排管敷设的窄线路建立了有限元模型并进行温度场仿真，验证了优化方案的准确性；最后通过对实际工程通道变窄前后的负荷进行对比设计了合适的窄线路，结果表明该通流方案可提高电缆的利用率，减小了通道变窄对载流能力的影响，窄线路采用不等负荷通流方案可提高电缆的输电能力，随着回路数的增加最大可提升6.53%。

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

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.