埋管敷设方式下多回路电缆截面优化方案

Optimal Selection for the Multi-Loop Cables Used in Buried Pipes

目前,对多回路电缆常将所有回路的载流量需求均依据N-1选取,导致电缆截面选择裕度过大,且对同等电流不同截面的电缆而言,截面越小,损耗越大,故电缆经济性必需综合考虑电缆损耗。以某110 kV电缆送电工程为例,建立了多回路电缆热场分析模型,分析了不同故障情况,得到了各回路电缆载流量需求,同时结合不同敷设断面、敷设环境影响,并进行了综合经济性比选。结果表明:该模型优化了工程电缆截面,为多回路电缆工程的电缆截面优化提供了参考和依据。

At present, for muhi-loop power cables, the se- lection of N-1 is often used for the ampaeity chosen, which of- ten resuhs in a large seleetion margin. It is known that for cables of different cross sections and the same amount of curtent, the smaller the cross seetion is, the greater the loss is, thus the loss should be comprehensively considered for economical benefits comparisons. In this paper, a certain 110 kV cable transmission project is taken as an example, a muhi-loop cahle thermal field analysis model is established to analyze the required ampacity for each circuit with the different conditions and a comprehen- sive economic comparison is analyzed based on different laying sections and environmental impacts. Finally, a cal,le section optimization strategy is proposed for muhiple-loop cable engineering, which would provide a reference and basis for other projects.