A modified "Pareto principle" has been applied to the analysis of the temperature field in three-phase high-voltage cables. In the paper the temperature field is described by thirteen distinct parameters including the geometrical dimensions of the system. By solving the thermal conductivity equation 2p times, it is possible to determine the parameters belonging to set A, which exert a decisive influence on the temperature of the cable core. To describe the ABC sets elements of linear algebra are applied. The paper’s concluding notes present a preliminary optimization procedure of the system.
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