Resumen de Investigation on the shaft voltage generation of large synchronous turboalternators

Kevin Darques, Abdelmounaïm Tounzi, Yvonnick Le Menach, Karim Beddek

• Purpose – This paper aims to go deeper on the analysis of the shaft voltage of large turbogenerators. The main interest of this study is the investigation process developed.

  Design/methodology/approach – The analysis of the shaft voltage because of several defects is based on a two-dimensional (2D) finite element modeling. This 2D finite element model is used to determine the shaft voltage because of eccentricities or rotor short-circuit.

  Findings – Dynamic eccentricities and rotor short circuit do not have an inherent impact on the shaft voltage. Circulating currents in the stator winding because of defects impact the shaft voltage.

  Originality/value – The original value of this paper is the investigation process developed. This study proposes to quantify the impact of a smooth stator and then to explore the contribution of the real stator winding on the shaft voltage.