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Development of a Space Load Measurement Technique Dedicated to Aeronautic Cables for HVDC On-board Networks

par Laurence Laffont - publié le , mis à jour le

Amin BENYOUCEF’s thesis defense intitled " Développement d’une technique de mesure de charges d’espace dédiée aux câbles aéronautiques destinés aux réseaux de bords HVDC" (Development of a space load measurement technique dedicated to aeronautic cables for HVDC on-board networks) will be taking place on Tuesday March 9th, 2021 at 2 pm in the amphithéâtre Concorde (Building U4 of University Toulouse III - Paul Sabatier).

Zoom link (from 1:45 pm) :

Meeting ID : 852 8595 4418
Passcode : 6jKTgi

Mind cutting off both of your microphone and camera.

Jury  :

Stéphane DUCHESNE : Professor at Béthune University (Rapporteur)
Petru NOTINGHER : Professor at Montpellier University (Rapporteur)
Carole HENAUX : Lecturer at INP Toulouse - LAPLACE - (Reviewer)
Emmanuel ODIC : Professor at Centrale Supélec (Reviewer)
Laurent BERQUEZ : Professor at Toulouse University III - LAPLACE - (Thesis supervisor)
Gilbert TEYSSEDRE  : Research director at CNRS (Thesis supervisor)
Eddy AUBERT : Research ingeneer at IRT / Safran (Supervisor)

Abstract :

The aeronautics sector knows a major boom in the sector of on-board electrical systems. These embedded technologies are generally made up of a power supply and an electrical receiver with a certain distance between the two. The electrical connection between these two devices is carried out by the cables which transport the electrical power necessary to be operational.

The aim of this study is to understand the physical phenomena occurring in the insulation of aeronautical cables when they are subjected to electrical stress. The insulation of the cables sees the load carriers modify their behaviour. For direct current systems, the phenomenon of partial discharges, well known in the case of alternating voltage, is actively studied with much less consequences than in alternating current, because the frequency of occurrence is greatly reduced. This change in technology can therefore have advantages. However, other effects, more specific to continuous stress, such as the accumulation of space charges, are to be considered. This constraint induces a constant electric field in the studied material which participates in the redistribution of charge carriers. The time-constant charge migration in question in insulating materials is slow : between several minutes to several hours.

An increase of the DC bus voltage beyond 3 kV is envisaged while the thickness of the electrical insulation is minimized to optimize the thermal and overall mass of the network. A significant increase in the electric field in the insulation is thus to be expected, possibly at levels where space charges could accumulate and the field threshold for non-linear conduction be reached. Therefore, the effects of space charges need to be studied, controlled and taken into account in future technologies. To meet these challenges, our objective is to develop a test bench to measure space charge distributions on aeronautical cables and to estimate the evolution of the electric field distribution in particular in multilayer arrangements used in cables and to identify the stress regimes where these phenomena occur.