Addressing space charge issues in aeronautical DC cables

A. Benyoucef (1) , Laurent Berquez (2) , G. Teyssedre (2) , Eddy Aubert (3)

1 LAPLACE - LAboratoire PLasma et Conversion d'Energie
2 LAPLACE-DSF - Diélectriques Solides et Fiabilité
3 IRT Saint Exupéry - Institut de Recherche Technologique

The aircraft of the future will be more electrical and all electrical. Technological evolutions foresee an increase of the DC voltage up to 3 kV or 6 kV with keeping the thickness of insulations to the minimum. This results in a strong increase of the electric field in the insulations and space charge can become an issue for the reliability of the systems. Indeed, space charge accumulation is at the origin of a residual field that modifies the electric field and may lead to a premature aging of the dielectric. Besides, the field distribution in complex structures like multilayers cannot be anticipated under DC as easily as under AC because conductivity is trickier to estimate and varies much more than permittivity. To measure these effects, we propose to develop a test bench adapted to aeronautical cables based on the PEA (Pulsed Electro Acoustic) method. The final aim is to assess the capabilities of current cables to be used for DC voltages in future aircrafts.

Domaines: Energie électrique

A. Benyoucef, Laurent Berquez, G. Teyssedre, Eddy Aubert. Addressing space charge issues in aeronautical DC cables. More Electrical Aircraft Congress, (MEA 2019) Toulouse, 06-07 Feb. 2019, Feb 2019, Toulouse, France. ⟨hal-02396326⟩