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Robin ACHEEN’s Thesis Defense

par Laurence Laffont - publié le , mis à jour le

Robin ACHEEN’s thesis defense intitled "Détermination et impact de l’existence de décharges partielles dans une chaîne de traction ferroviaire utilisant des composants à base de SiC" (Determination and impact of the existence of partial discharges within railway traction chains using SiC-based components) will occur on November, 9th 2020 at 10 am by means of visioconference.

The work has been supervized by Mr Thierry LEBEY as well as Mr Stéphane DUCHESNE.

Zoom link :
https://us02web.zoom.us/j/84942879581?pwd=NG1YaXBJODVNMjZhTXl3SFZ5cTlSZz09

Conference ID : 849 4287 9581
Code : mEh2R9

The link will work from 9.45 am. Be careful to turn off the microphone and camera.

Jury :

Mr Thierry LEBEY, Safran Tech - Thesis Supervisor
Mr Stéphane DUCHESNE, LSEE, Université d’Artois - Thesis co-Supervisor
Mr Andrea CAVALLINI, University of Bologna - Rapporteur
Mr Christopher GERADA, University of Nottingham - Rapporteur
Mr David MALEC, CNRS, Institut National Polytechnique de Toulouse, LAPLACE - Reviewer
Mrs Sonia AIT AMAR, LSEE, Université d’Artois - Reviewer
Mr Cédric ABADIE, IRT Saint Exupéry - Guest
Mr Benali BOUALEM, ALSTOM - Guest

Abstract :

The introduction of SiC-based components in the electromechanical chain presents numerous advantages, but has consequences on the reliability of the insulation systems in the machine. For switching frequencies up to 5 kHz, and dV/dt varying from 15 to 30 kV/µs, a system lifetime of around 40 years (or 200 000 hours) must be guaranteed. The question that arises is to know what margin insulation systems of the current equipment have. It is thus necessary to determine whether, under normal operating conditions, phenomena that did not previously exist or were not completely apprehended will appear with the transition to SiC-based inverters. One of these phenomena is Partial Discharge (PD) and its development in machines, and more precisely in the turn-to-turn, turn-to-ground, and phase-to-phase insulation systems. Therefore, the objective of the thesis is to study the influence of the electrical stress imposed by SiC components on the insulation of machines. To do so, a first phase of electrical stress identification allows accounting for the constraints undergone by the machine. In a second phase, these constraints are reproduced on representative samples, which are thus subject to accelerated aging, in order to establish aging laws and to study the degradation of the insulation systems under stress.

Keywords :
Partial discharges, inverters, electric machine, railway, SiC, insulation systems, electrical stress, aging