Author(s)

A. Geri, M. Ianicelli, L. Podestà & G.M. Veca

Abstract

In this paper the authors present a model designed to determine, over the course of time, the ampacity of a buried cable, the map of the temperature both inside the cable and in the surrounding soil. The model is quite versatile: analyses can be made for various types of cables, filler materials of the trench and types of soil. Other analyses can simulate various ways of laying configurations, load rates, as well as various environmental conditions. The numerical results presented in this paper refer, in particular, to a typical installation in urban areas of a three-phase underground power line at 20 kV, consisting of three unipolar cables insulated with dampened paper and a lead casing which are then covered in PVC and running at both nominal rate and in overload. The numerical algorithm is ba

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