A noninvasive method for detecting failure of brushless exciter rotating diodes is presented in this paper. Diodes can fail in one of two ways: either open circuit or short circuit. It is shown by actual test, on a 31.5-kVA alternator, that the exciter field current waveform changes distinctly when a diode fails. Harmonic analysis of the exciter field current waveform is performed. The results of this analysis form the basis of a method for real-time detection of diode failure on a microprocessor-based platform.
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McArdle et al. (2004) studied this question.
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