研究目的
Investigating the optimal RC ladder-type equivalent circuit for the representation of the soil for dynamic thermal rating of underground cable installations.
研究成果
The paper introduces an optimal soil model based on a physical discretization of the soil into a few layers, providing up to 20 times faster response than currently available approaches. A model of order five can represent all typical transients on common installations, making it suitable for real-time operations of underground power cables.
研究不足
The model requires careful selection of the number of layers and their distribution to accurately represent the soil's thermal dynamics. The depth of the model must be correctly determined to ensure accurate steady-state results.
1：Experimental Design and Method Selection
The methodology involves a nonuniform discretization of the soil into layers, with resistive and capacitive circuit elements computed from the dimensions and physical parameters of the layers. The model is compatible with the International Electrotechnical Commission thermal–electric analog circuits for cables.
2：Sample Selection and Data Sources
The study uses soil layers around underground cables, with parameters derived from the thermal resistivity, heat capacity of the soil, and dimensions of each layer.
3：List of Experimental Equipment and Materials
Not explicitly mentioned in the paper.
4：Experimental Procedures and Operational Workflow
The soil is discretized into layers, and the model parameters are computed. The model's performance is assessed by comparing results of finite-element simulations for different loading conditions of a single cable placed at 1 m below the ground level.
5：Data Analysis Methods
The model's performance is compared against transient finite-element simulations for durations of 5 and 200 hours, and for different burial depths and thermal resistivities.
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