FAULT DETECTION IN BRUSHLESS EXCITERS

摘要

A method for detecting a fault in an exciter circuit, suitable for use in a brushless generator, the exciter circuit including (a) an exciter armature winding, having a plurality of armatures, arranged to generate a multiphase AC signal, each armature of the plurality of armatures providing a respective sub-signal component of the multiphase AC signal, and (b) a rectifier circuit for receiving the sub-signals via the respective armatures, the rectifier circuit comprising a plurality of components arranged to rectify the sub-signals to provide a rectified output signal, wherein the method includes the steps of: acquiring a respective operational sub-value for a first characteristic of each of at least two of the respective sub-signals; deriving an operational value indicative of a relationship between the acquired respective operational sub-values; determining whether a fault has occurred in the exciter circuit on the basis of the derived operational value.

主权项

1. A method for detecting a fault in an exciter circuit, suitable for use in a brushless generator, the exciter circuit including
an exciter armature winding, having a plurality of armatures, arranged to generate a multiphase AC signal, each armature of the plurality of armatures providing a respective signal component of the multiphase AC signal, and a rectifier circuit for receiving the signal components from the respective armatures, the rectifier circuit comprising a plurality of diodes arranged to rectify the signal component to provide a rectified output signal, wherein the method includes the steps of: acquiring, for each of at least two signal components, a respective characteristic value for a first characteristic of the signal components; acquiring, for each of at least two signal components, a respective further characteristic value for a second characteristic of the respective signal component; calculating the magnitude of the nth order harmonic component for each acquired characteristic value; calculating the magnitude of the nth order harmonic component for each acquired further characteristic value;on the basis of the calculated magnitudes, calculating the nth order harmonic admittance and/or impedance of the rectifier circuit; and
determining whether a fault has occurred in the exciter circuit on the basis of the nth order harmonic admittance and/or impedance of the rectifier circuit.