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A nonlinear coupled electrothermal model of underground cables having aluminum sheaths is developed. The mathematical model deals with the numerical evaluation of losses, heating and ampacity. The filament method, the advancing front method as well as the finite-element method combined with the mapped infinite elements are used. In particular, an improved modelling of heat sources is carried out, taking into account the influence of the nonuniform losses distribution of a particular sheath on the cable heating. Moreover, the calculation of losses is performed with respect to the nonuniform temperature distribution of a particular sheath. Some illustrative computational results leading to clear-cut concluding remarks are given.
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Kova et al. (2006) studied this question.
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