不规则排列电缆温度场及载流量计算

Calculation on Temperature Field and Current-Carrying Capacity of Irregularly Arranged Cables

电缆在电缆沟中的不规则摆放将改变电缆温度场分布。以交联聚乙烯电缆为例,建立了电缆沟敷设方式下规则与不规则排列电缆的温度场计算模型,得出了电缆温度场分布,采用双点弦截法计算了电缆的载流量。计算结果表明:电缆的不规则排列将会导致其缆芯温度升高、载流量减小,为保障不规则排列电缆的安全运行,应对其温度及载流量在线监测。

The irregular arrangement of cables will change the distribution of cable temperature field. Taking cross-linked polyethylene cable for example, a calculation models for temperature field under regular and irregular arrangement of cables which are laid down in cable channel, then the distribution of temperature field is obtained; meanwhile, by means of double-point secant method the current-carrying capacity of cables is computed. Calculation results show that irregular arrangement of cables lead to the temperature rise and current-carrying capacity decrease of cables. To ensure the secure operation of irregularly arranged cables, the on-line monitoring of temperature and current-carrying capacity of cables should be performed.