Alternating-current brushless generator fault detection method based on exciter exciting current

Abstract

The invention provides an alternating-current brushless generator fault detection method based on an exciter exciting current. The method comprises the following steps: firstly, measuring the direct-current component and each subharmonic amplitude value of the exciter exciting current of a generator set; and then, detecting whether the generator set generates electrical failures or not with a stator winding turn-to-turn short circuit diagnosis algorithm, a rotor winding turn-to-turn short circuit diagnosis algorithm, an exciter fault diagnosis algorithm and a rotary rectifier fault diagnosis algorithm, wherein the electrical failures comprise stator winding turn-to-turn short circuit, rotor winding turn-to-turn short circuit, exciter rotor winding turn-to-turn short circuit, exciter rotor winding interphase short circuit, open circuit of one diode of the rotary rectifier and short circuit of one diode of the rotary rectifier. According to the LabView development fault diagnosis algorithm, various electrical faults can be detected by measuring the exciter exciting current so as to save measurement points, and various invasive sensors do not need to be installed in the generator. The alternating-current brushless generator fault detection method has good instantaneity, and the on-line detection requirement can be satisfied.

Description

technical field [0001] The invention relates to the technical field of generator state monitoring and fault diagnosis, in particular to a fault detection method for an AC brushless generator based on the excitation current of an exciter. Background technique [0002] Existing monitoring and diagnosis of generators mainly carry out condition monitoring and fault diagnosis of winding insulation, bearings and cooling systems, and rarely involve monitoring and diagnosis of electrical faults of generator sets. This is because there are many types of generator electrical faults and the fault locations are scattered. Early electrical faults mainly include inter-turn short-circuits in generator stator windings, inter-turn short-circuits in generator rotor windings, and generator excitation system faults. At present, for each type of electrical fault, different detection methods are required, different sensors are installed, and different diagnostic algorithms are applied. Therefore...

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Problems solved by technology

[0006] The invention provides an AC brushless generator fault detection method based on the excitation current of the exciter, which can solve the problem that the existing generator fault diagnosis method cannot perform unified monitoring and centralized diagnosis on various generator electrical faults

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