Shaft voltage is present in all electrical machines and can be useful as a diagnosis variable once the effect of some defects on this quantity is well quantified. 2D numerical models have already been used to tackle this point but 3D effects due to end windings can also have a significant influence on this voltage. This paper deals with the study of a turbo-generator using a 3D finite element model in order to investigate this task. In this aim, two finite element models in 2D and 3D of a high power turbo-generator are performed. The effect of three common defects on the shaft voltage is investigated while taking into account the nonlinear behaviour of ferromagnetic materials and the armature winding of the stator. Results with both models are analyzed and compared.
MileticA.TurkD. and PolakJ., Turbogenerator rotor interturn fault detection using the leakage field analysis - case study, in: IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics Drives, 2007, pp. 447–450.
2.
FrosiniL.BorinA.GiomettaL. and VenchiG., Development of a leakage flux measurement system for condition monitoring of electrical drives, in: Symposium on Diagnostics for Electric Machines, Power Electronics and Drives (SDEMPED), 2011.
3.
CuevasM.RomaryR.LecointeJ.-P. and JacqT., Non-invasive detection of rotor short-circuit fault in synchronous machines by analysis of stray magnetic field and frame vibrations, IEEE Transactions On Magnetics52(7) (2016).
4.
AlamehK.CitéN.HoblosG. and BarakatG., Feature extraction for vibration-based fault detection in permanent magnet synchronous motors, in: International Conference on Technological Advances in Electrical, Electronics and Computer Engineering, 2015, pp. 163–168.
5.
BessousN.ZouzouS.E.SbaaS. and BentrahW., A comparative study between the MCSA, DWT and the vibration analysis methods to diagnose the dynamic eccentricity fault in induction motors, in: Proceedings of the 6th International Conference on Systems and Control, 2017.
6.
AlbrightD.R., Interturn short-circuit detector for turbine-generator rotor windings, IEEE Transactions on Power Applications and Systems90(2) (1971), 478–483.
7.
AlgerP.L. and SamsonH.W., Shaft currents in electric machines, Trans. AIEE43 (1924), 235–245.
8.
AmmannC.ReichertK.JohoR. and PosedelZ., Shaft voltages in generator with static excitation systems – problems and solution, IEEE Trans.3(2) (1988).
9.
NippesP.I., Early warning of developing problems in rotating machinery as provided by monitoring shaft voltages and grounding currents, IEEE Transactions on Energy Conversion19(2) (2004), 340–345.
10.
TorlayJ.-E.CorenwiderC.AudoliA.HérigaultJ. and FoggiaA., Analysis of shaft voltages in large synchronous generators, in: Electric Machines and Drives, International Conference IEMD’99, 1999, pp. 607–609.
11.
De CanhaD.CronjeW.A.MeyerA.S. and HoffeS.J., The use of an electromagnetic finite elements package to aid in understanding shaft voltages in a synchronous generator, in: IEEE PES PowerAfrica 2007 Conference and Exposition Johannesburg, South Africa, 2007.
12.
De CanhaD.CronjeW.A.MeyerA.S. and HoffeS.J., Methods for diagnosing static eccentricity in a synchronous 2 pole generator, in: Power Tech, 2007 IEEE Lausanne, 2007, pp. 2162–2167.
13.
DoorsamyW.CronjeW.A. and MeyerA.S., Multiple fault diagnosis on a synchronous 2 pole generator using shaft and flux probe signals, in: IEEE International Conference on Industrial Technology, 2013, pp. 362–367.
14.
DoorsamyW. and CronjeW.A., An electromagnetic model for shaft voltages in synchronous generators, in: IEEE International Conference on Industrial Technology, Busan, Korea, 2014.
15.
DarquesK.TounziA.Le MenachY.BeddekK. and BietM., An approach to model shaft voltage of wound rotor synchronous machines, in: CEFC, Miami, USA, 2016.
16.
DarquesK.TounziA.Le MenachY. and BeddekK., Study of shaft voltage of a simplified synchronous generator, in: ISEM 2017, Chamonix, France, 2017.
17.
PlazenetT.BoileauT.CaironiC. and Nahid-MobarakehB., An overwiew of shaft voltages and bearing currents in rotating machines, in: Industry Applications Society Annual Meeting, IEEE, 2016.
18.
Tanno-IamamuraB.Le MenachY.TounziA.SadowskiN. and GuillotE., Study of static and dynamic eccentricities of a synchronous generator using 3D FEM, IEEE Trans. Mag.46(8) (2010), 3516–3519.
