Device and method for monitoring operation state of main shaft of generator

Abstract

The invention relates to a device and method for monitoring the operation state of a main shaft of a generator, and the device comprises a sampling carbon brush, a grounding carbon brush, an insulating support, a signal monitoring device, and a grounding device. The insulating support is disposed on a radial section of the main shaft of the generator, and is provided with the sampling carbon brushand the grounding carbon brush. The sampling carbon brush and the grounding carbon brush respectively make contact with the radial section of the main shaft of the generator. The sampling carbon brush and the grounding carbon brush are electrically connected with the signal monitoring device. The grounding carbon brush is grounded through the grounding device. The signal monitoring device monitors a voltage waveform between the sampling carbon brush and the grounding carbon brush, carries out the comparison and analysis of the voltage waveform and a typical waveform, and obtains the operationstate of the main shaft of the generator. According to the scheme, the device obtains the axial voltage generated by the radial section of the main shaft of the generator, monitors the operation state of the main shaft of the generator according to the comparison analysis result of the waveform of the axial voltage and the typical waveform, and achieves the accurate monitoring of the operation state of the main shaft of the generator. The invention also provides the main shaft of the generator and a steam turbine.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a monitoring device for the running state of a generator shaft and a monitoring method thereof, a generator shaft and a steam turbine. Background technique [0002] During the operation of the generator, due to the asymmetry of the magnetic field circuit between the stator and the rotor of the generator, the amount of static charge attached to the main shaft of the generator changes to generate shaft voltage, which has a negative impact on the operation of the generator. [0003] In terms of eliminating the shaft voltage hazard of the generator, a reliable insulating gasket is usually installed on the bearing base of the generator shaft close to the end of the exciter to form a single-point grounding method of the shaft to avoid the formation of a current loop between the two bearings. To eliminate the effect of shaft voltage, one or two parallel shaft grounding carbon brushes can...

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a monitoring device for the running state of the generator shaft and its monitoring method, the generator shaft and the steam turbine to solve the problem of low reliability of the traditional technology.

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