Nonlinear-coupled electric-thermal modeling of underground cable systems
Nonlinear-coupled electric-thermal modeling of underground cable systems
复制标题
地下电缆系统的非线性耦合电热建模
DOI：
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复制
发表时间：
2006
影响因子：
4.4
通讯作者：
D. Poljak
中科院分区：
文献类型：
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作者：
N. Kovač;I. Sarajčev;D. Poljak
提出了具有固体护套的地下电缆的原始非线性耦合电热模型。该模型处理损耗、加热和载流量的数值评估。电流相关损耗的计算是通过灯丝法进行的，其中导体和护套由许多较小的子导体或灯丝代表。此外，通过土壤表面下方“无限”域的传热现象分别结合有限元和映射无限元进行建模。采用前进前沿法生成相应的有限元网格。这项工作中提出的数值结果表明，国际电工委员会关于接触电缆的外部热阻的关系，放置在平坦的结构中，具有明显的护套损耗，应该重新检查。
An original nonlinear-coupled electric-thermal model of underground cables with the solid sheaths is proposed. The model deals with the numerical evaluation of losses, heating, and ampacity. The computation of the current dependent losses is undertaken by means of the filament method, where conductors and sheaths are represented by a number of smaller subconductors or filaments. Furthermore, heat-transfer phenomena through an "infinite" domain beneath the soil surface are modeled combining the finite and the mapped infinite elements, respectively. The corresponding finite-element meshes are generated by the advancing front method. The numerical results presented throughout this work suggest that the International Electrotechnical Commission relation concerning the external thermal resistance for touching cables, placed in flat formation, having appreciable sheath losses, should be re-examined.