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LABORATORY OF ELECTRICAL ENGINEERING AND POWER ELECTRONICS

Research – Development – Innovation

Séminaire Equipe OMN, 31 Mai 2018

Le Jeudi 31 mai 2018, Kevin DARQUES, doctorant de l’équipe OMN, effectuera un séminaire sur le thème :

Contribution to the shaft voltage modeling of high-power generators
suivi d’une discussion scientifique.

Date : Jeudi 31 Mai 2018 à 13h30
Lieu : Salle 2S53 à Lilliad

In large turbo-generators, shaft voltage exists due to the inherent minor imperfections in the construction of the machine or material imperfections but also to defects such as eccentricities or rotor shorts circuits. Therefore, its analysis can constitute a variable to be used to diagnosis some machine defects. A first step consists in determining in an accurate way the effect of these defects on the shaft voltage. In this aim, a didactic analysis is carried out with the help of numerical model based on 2D FEM.
Two high-power non-salient pole synchronous generators of 2 and 4 poles are studied. The study is carried out gradually, first on a simplified structure and then introducing the effect of the stator slots, the parallel coupling, the load or eddy currents in the damper bars have been investigated. The obtained results are analyzed in order to clearly determine the impact of each variable.