直埋单芯电缆载流量仿真方法研究及其应用

Simulation Method for Buried Cable Ampacity and Its Application

当前通常采用IEC60287标准推荐方法对电缆载流量进行计算,但在工程实际中,发现该方法计算结果与实际情况有一定差距。以直埋敷设条件下的110 kV高联聚乙烯(cross-linked polyethylene,XLPE)电缆为研究对象,建立了磁热耦合环境下的电缆载流量的仿真计算模型,与IEC60287标准计算结果进行对比,并结合理论分析进行验证。应用该仿真方法研究了邻近效应对直埋电缆载流量的影响,通过改变电缆的排列方式及相间距,指出邻近效应的影响随相间距增大而减小。

Recommendation method of IEC 60287 standard is usually used for calculating cable ampacity at present, but in actual engineering practice, the result of this method is different from that of actual situation. Therefore, this paper takes 110XLPE cable under the condition of direct burial installation for a research object and establishes a simulation and calculation model for cable ampacity in magnetic thermal coupling environment. It compares the simulation result with that of IEC 60287 standard and verifies by combining theoretical analysis. It studies influence of proximity effect on ampacity of the buried cable by using this method and points out influence of proximity effect decreases with increase of phase space by research on changing arrangement of cables and phase spaces.