Abstract
This paper presents the computation of the cable ampacity and the temperature distribution through long duration based on the equivalent thermal circuit based on IEC 60287 standard and the Finite element method using COMSOL (Multiphysics environment, version 5.5). This study investigated the cable ampacity and the temperature rise of the cable core and sheath at steady state and emergency conditions. The cable ampacity was investigated at different conditions such as the variation of cable depth, soil properties, and soil temperature. The results confirmed the adaptation between the thermal circuit results and the COMSOL results as well as the effectiveness of using the numerical method to compute the cable ampacity. Using the COMSOL-based thermal properties evaluations, the transient performance of the cable is ascertained. The transient study is performed for different cable loading currents and dry zone sizes.
Highlights
The ampacity of the cable is limited based on the cable temperature, which does not exceed 90 ◦ C for XLPE cables and controls the cable lifetime
Figure illustrates the flowchart tribution through the cable element, which is determined based on the cable loa to compute the cable ampacity
Several parameters that influence on the(transient cable ampacity are investigated such as the cable depth, soiland resistivity, with the time state)
Summary
The installation and maintenance of power cables are more expensive than overhead lines. Thermal circuit in IEC 60287 and numerical simulation were used to compute the cable temperature. Due to several simplifications and limitations of the IEC 60287 standard, this paper modelled the cable, based on the equivalent thermal circuit, using COMSOL environment. Paper used the analytical model to compute the cable ampacity under different conditions and the temperature through a cable, using the two-loop thermal circuit of the cable, based on IEC 60287 standard. Since the analytical method considers some ideal assumptions, COMSOL Multiphysics was used to model the cable, to evaluate the temperature performance of the cable and sheath, concerning thermal model at different loading current. The results indicated a good correlation between the analytical and numerical results
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