For decades, electrical energy network in aircrafts was based on relatively low voltage (mainly 115V ac and 28V dc), providing the power to the different energy functions of the aircraft. Great strides have been made in the new aircraft generations, notably the A380 and the Boeing 787, with an increase of the aircraft size, and with the input of electrical energy in replacement of certain hydraulic or pneumatic actuations. Today, there is a tendency to replace HVAC network with HVDC (+/-270 V dc, 540 V dc and higher in the future) network in order to benefit from these many advantages. This increase of the electrical energy pushes the transmission cables to their limits and leads to questions about the impact of these new constraints on the aeronautic cables insulation. This article presents a macroscopic model and comparison between simulation results and measurements made on bi-layer materials used in actual aeronautic cable insulation. The electric field distribution within materials and kinetic of interfacial charges build-up are analyzed.
This paper deals with the growing need of electrical energy in aeronautical domain, which appears since several years. We focus on HVDC: over the "classical" 28 V dc, this voltage level is used and will be used more and more for supplying electrical devices. Conduction current measurements were performed on cables for different temperature and electric field values. The objective is to observe a temperature and electric field dependence of the electrical of cables' insulations. The results of current measurements were used as input for multi-physics models. Measurements demonstrate the conductivity varies very slightly with the temperature and field.
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