Inversion of Soil Thermal Conductivity and Ampacity of the Buried High Voltage Power Cables

Buried power cables are widely used because it has the advantages of a short construction cycle and an excellent heat dissipation ability. Different laying condition in the process of operations has an important impact on the temperature rise and ampacity of the power cable. In this paper.a multi-physics coupled field model of the electromagnetic field and the thermal field is first developed. In this respect, on the basis of burial laying, one takes into account the heat dissipation mode of the cable, heat dissipation path, characteristic parameters of the materials and other factors. The soil thermal conductivity is an important parameter to determine the accuracy of the cable's temperature field and ampacity. In this regard, a mathematical model for inversion of the soil thermal conductivity and cable ampacity is then proposed. The single-target immune clone selection algorithm(ICSA) is used to solve the corresponding inverse problem. The numerical results show that the inverse method is quite useful to the numerical calculation of the buried cables' ampacity and favorable to the ampacity's improvement.