Detection of brushless exciter rotating diodes failures by spectral analysis of main output voltage

Author

Salah, Mohamed ; Bacha, Khaireddine ; Chaari, Abdelkader

Author_Institution

Unit of Res. in Control, Monitoring & Reliability of the Syst., Higher Sch. of Sci. & Technol. of Tunis Tunis, Tunis, Tunisia

fYear

2013

fDate

21-23 March 2013

Firstpage

1

Lastpage

6

Abstract

Rotating rectifier is a basic part of synchronous generators. Inappropriate operation of this component can prove costly for the machine´s owner. This paper presents theoretical analysis and experimental validation for detecting failure of brushless exciter rotating diodes that can fail either open circuit or short circuit. Harmonic analysis of the alternator output voltage waveform is performed when machine is unloaded as well as when it runs around its rated load. Apparition of characteristic frequencies can be useful to distinguish the rotating diodes state. By considering the relative amplitudes at specific harmonics, it is possible to discriminate short circuit diode failure case from open circuit diode breakdown.

Keywords

brushless machines; exciters; fault diagnosis; harmonic analysis; rectifying circuits; spectral analysis; synchronous generators; alternator output voltage waveform; brushless exciter rotating diodes; characteristic frequencies; failure detection; harmonic analysis; open circuit diode breakdown; rotating diode state; rotating rectifier; short circuit diode failure case; synchronous generators; Alternators; Bridge circuits; Circuit faults; Coils; Harmonic analysis; Rectifiers; Voltage control; Brushless exciter; fault diagnosis; harmonic analysis; rotating rectifier; synchronous generator;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Engineering and Software Applications (ICEESA), 2013 International Conference on

Conference_Location

Hammamet

Print_ISBN

978-1-4673-6302-0

Type

conf

DOI

10.1109/ICEESA.2013.6578469

Filename

6578469