Abstract

CARDENAS ESTRADA, Dorindo Elam; GRACIA VILLAR, Santos; FERNANDEZ DIEZ, Federico  and  DZUL, Luis Alonso. The thermal electrical overheating. A physicochemical perspective of the electrical warming. Rev.fac.ing.univ. Antioquia [online]. 2012, n.64, pp.57-67. ISSN 0120-6230.

The present article exposes the actual behaviors observed after five years of investigation, experimentation and modeling, with electrical conductors that had a fault by high thermal conduction, with the principal purpose of producing a contribution that could be added to the existing regulations for the selection of wiring of electrical projects in low voltage. Till now, the experiments realized with electrical inflamed conductors, in most cases are focused to trying to determine if the electric conductor was ignited by electric arch or if it was a victim of the fire, by means of physicochemical tests with the remains of the conductor. When we consider factors like the intensity of current, type of installation, environmental temperature, heat sources nearby conductors, conditions of overload, and the transverse effective section of conduction after consider skin effect and turns of cable, the selection of a suitable conductor becomes a difficult decision. All these factors are considered separately in Spanish norms as in international norms; despising in many cases some conditions that may be important cause of fault. Presented model is result of experimentation and a global analysis that takes care of all these factors simultaneously, after the review of conclusions of the most relevant chemical and physical investigations.

Keywords : Electric conductor; electric current; mathematical model; power dissipation; resistivity.

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