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Research on an online diagnosis for rotating diode faults in three‐phase brushless exciter with two coils
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The rotating rectifier is prone to be damaged in the exciter of the brushless excitation system, wherein a diode open‐circuit fault which is common can affect the normal and safe operations of a generator. On the basis of the structure of the brushless exciter, this study, analysed the effect that an open‐circuit in one and two diodes had on armature current and armature field, and put forward a new online detection method for diode open‐circuit fault. In this method, two magnetic field detection coils are installed on the stator iron yoke of the brushless exciter, and the open‐circuit fault of the diodes can be reflected by the induced voltage difference of the two detection coils. Using a 16‐pole, three‐phase brushless exciter as an example, the performance of this new diagnosis method was verified by using a finite element simulation.
Institution of Engineering and Technology (IET)
Title: Research on an online diagnosis for rotating diode faults in three‐phase brushless exciter with two coils
Description:
The rotating rectifier is prone to be damaged in the exciter of the brushless excitation system, wherein a diode open‐circuit fault which is common can affect the normal and safe operations of a generator.
On the basis of the structure of the brushless exciter, this study, analysed the effect that an open‐circuit in one and two diodes had on armature current and armature field, and put forward a new online detection method for diode open‐circuit fault.
In this method, two magnetic field detection coils are installed on the stator iron yoke of the brushless exciter, and the open‐circuit fault of the diodes can be reflected by the induced voltage difference of the two detection coils.
Using a 16‐pole, three‐phase brushless exciter as an example, the performance of this new diagnosis method was verified by using a finite element simulation.
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