摘要
根据传热学理论建立了考虑流场影响的电缆温度场计算模型,给定了电缆沟敷设电缆的温度场边界条件,并以电缆沟敷设6回路电缆为例验证了模型的正确性,该模型也可用于通风电缆沟(隧道)敷设电缆的温度场计算。研究了沟深和电缆层间距对电缆允许载流量的影响规律,并结合土建成本对电缆沟敷设方案进行了经济性分析。计算结果表明,在通过改善电缆散热效果来提高电缆载流量方面,电缆层间距优化比电缆沟深度优化能获得更佳效果;适当的电缆沟深度优化具有土建投资成本回收时间短的优点;实际电缆沟敷设方案选取时,应先考虑电缆层间距优化,再考虑电缆层间距和电缆沟深度的综合优化。
The calculation model of cable temperature field considering the influence of flow field is established according to the theories of heat transfer and the temperature field boundary conditions of cable in trench are determined.Its accuracy is verified by an example of six-loop cables in trench.The model can also be used for the temperature field calculation of cable in tunnel.The influences of trench depth and cable layer spacing on the cable permissible current carrying capacity are studied and the economical efficiency of cable trench laying schemes is analyzed combined with the construction cost.Calculated results show that,in increasing the current carrying capacity of cable by improving its heat dissipation,the optimization of cable layer spacing has better effect than the optimization of cable trench depth,and proper optimization of cable trench depth may shorten the recovery time of civil investment cost.In actual selection of cable trench laying scheme,the optimization of cable layer spacing is superior to the integrated optimization of cable layer spacing and cable trench depth.
出处
《电力自动化设备》
EI
CSCD
北大核心
2013年第1期50-54,共5页
Electric Power Automation Equipment
基金
国家自然科学基金资助项目(51007096)
中央高校自主课题资助项目(CDJZR10150001)~~
关键词
电缆
电缆沟
流场
温度场
载流量
土建成本
模型
electric cables
trench
flow fields
temperature field
current carrying capacity
construction cost
models
