Air-gap field detecting device of alternating-current generator and application thereof in state monitoring and control method of alternating-current generator

Abstract

The invention relates to an air-gap field detecting device of an alternating-current generator, comprising a detecting coil and a signal detecting and processing circuit, wherein the detecting coil is arranged on a rotor of the alternating-current generator and surrounds one zone on the inner surface of the stator, and the induced voltage of the detection coil is relevant to the strength of an air-gap field in the zone surrounded by the detecting coil, as well as the distribution condition and the changes of the air-gap field; the signal detecting and processing circuit is connected with the detecting coil and used for detecting and processing the induced voltage of the detecting coil; the signal detecting and processing circuit can be used for detecting and processing the fundamental waves or the harmonic waves of the induced voltage of the detecting coil, or detecting and comparing the induced voltages of different detecting coils, and the detection and processing result can be used for the monitoring of the states of the generator, including the faults of stator and rotor windings, the decentraction of a stator and a rotor, axial and opposite shift of the stator and the rotor, magnetism loss, overload, external short circuit and circuit breakage and the like; and the detection and processing result of signals can also be used for the operation control of the generator.

Description

technical field [0001] The invention relates to an alternator air-gap magnetic field detection device and its application, in particular to online detection of the air-gap magnetic field of the generator and application of the detection result to the state monitoring and control of the generator. Background technique [0002] At present, the status monitoring objects of the alternator include voltage, current, frequency, speed, temperature, vibration, partial discharge, etc. The detection of these variables can meet the basic requirements of generator protection and control. However, with the increase of the capacity of modern generators, higher requirements are put forward for the reliability of generator operation, and higher requirements are also put forward for the protection and control of generators. The current detection of generators generally observes the generator as a whole, lacks finer monitoring inside the generator, and has deficiencies in early fault detection...

AI Technical Summary

Problems solved by technology

At present, the detection of the generator is generally to observe the generator as a whole, lack of finer monitoring inside the generator, and there are deficiencies in the early fault detection and precise control of the generator

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