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The insulation of power supply cables is increasingly performed by non-polar polymers. These materials, mainly polyolefins, combine low density and low cost of production. Among them, cross-linked polyethylene (XLPE) is up to date the best choice for an effective high voltage insulation. The aim of this work is to investigate the possibility to find out a new materials for electrical insulations that...
This paper concerns the outcome of a life test campaign performed on twisted pairs specimens insulated by non corona resistant polyamide-imide enamel. Twisted pairs have been subjected to AC voltage having 50 Hz frequency: different voltage amplitude levels higher than the partial discharge inception voltage (PDIV) have been considered. The tests have been performed into an environmental chamber in...
Technical standards about security and safety in buildings always include strict requirements about the resistance to the ignition and propagation of fire of electrical components. In particular both power distribution and signal transmission cable insulation must often provide the best flame retardancy possible, especially in public places and transportation systems. This paper presents the outcome...
An experimental study, aimed at the identification of specific cable behaviour during "burn tests" was implemented by performing suitable tests at different temperatures. The adopted fire-resistance test end-point criterion was the short-circuit between the energized conductors or between a conductor and a grounded screening tape. The variation with time of the insulation resistance, measured...
Flat-conductors made by high temperature superconducting filaments can be electrically insulated by a host of different materials. After selecting the best performing system, an electrical characterisation stage has been implemented through dielectric breakdown tests in air and in liquid nitrogen (LN2) and through ageing in LN2, at atmospheric pressure
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