Current measurements on insulating materials used in aeronautic HVDC cables
Résumé
With the prospective of a more electric aircraft, new technologies are already developed or under development. It is for example the case with the replacement of hydroelectric or pneumatic power actuators by electric actuators. HVDC energy-networks are thought to replace HVAC technologies in the transport of electricity, and an increase of power density along these cables will also push the actual systems to their limits. In this context, knowing the electric field distribution within the cable insulating system becomes essential to prevent any electric breakdown, leading to a decrease of reliability of the electric system. To do so, it is then necessary to understand the behaviour of the cable polymeric insulation when submitted to an electrothermal stress. This work focuses on the experimental characterization of insulating materials presently used in aeronautic cables. Current measurements have been performed on Kapton (Polyimide-PI) and Polytetrafluoroethylene (PTFE), for different electric fields and temperatures. The results show a non-linearity in field for both materials.
Domaines
Sciences de l'ingénieur [physics]
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