Abstract
It is well-known that a Hydronic Asphalt Pavement (HAP) system represents an alternative method to collect heat from the Sun. In case of installation above underground power cables whose trench is completely filled with high thermal conductivity bedding, the HAP system could also collect a portion of heat generated in the cables. By collecting heat from the Sun and cables, the HAP would behave as a cooler for the cables. The application of this method to a hot spot of underground power cables is regarded as a novelty. This paper considers the use of the proposed method for eliminating the negative thermal effect of an actual hot spot on the ampacity of a 110 kV cable line, which is installed in parallel with the group of four 35 kV cables and which crosses an underground heating pipeline. The mutual thermal effects between the underground installations are simulated using FEM-based models for specified environmental conditions. In addition, an appropriate experimental background, one reference FEM-based model and two required base cases are provided. Finally, it is found that the hot spot effect can be completely eliminated and that the ampacities of the 110 kV and 35 kV cables can be increased significantly.
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