基于负荷电流的综合管廊电缆发热量计算
Calculation of cable calorific value for utility tunnels based on load current
摘要：
综合管廊属于密闭型地下构筑物,廊内敷设的电缆是主要的发热源。准确估计入廊电缆的发热量有助于通风设备的合理选择和工艺的科学设计,避免造成资源和成本的浪费。本文提出了基于负荷电流的电缆发热量计算方法,通过对出变电站母线段电缆进行分析,得到了更为精确的电缆负荷电流。通过计算可知,使用负荷电流进行电缆发热量计算得到的结果比使用载流量进行电缆发热量计算的结果更为准确,且明显减小,可以实现在满足规范要求和功能需要的前提下降低能耗、节约成本。
Abstract：
The utility tunnel is a closed underground structure, and the cables laid in the utility tunnel are the main heat source. Accurate estimation of the calorific value of the tunnel cable is helpful for the reasonable selection of ventilation equipment and the scientific design of the process, so as to avoid the waste of resources and costs. In this paper, a calculation method of cable calorific value based on load current is proposed, and a more accurate cable load current is obtained by analysing the cable of the bus section of the substation. Through the calculation, it can be seen that the results obtained by using the load current for cable calorific value calculation are more accurate than the results of the cable calorific value calculation using the ampacity, and the results are significantly reduced, which can reduce energy consumption and save cost under the premise of meeting specification requirements and functional needs.
Keywords:cable; calorific value; utility tunnel; load current; ampacity; tunnel temperature