Real-time Diagnosis Method of Original Mass Unbalance Fault of Turbine Generator Set Rotor

Abstract

The invention discloses a real-time diagnosis method for the unbalanced fault of the original mass of the rotor at the operating speed of the steam turbine generator set, which belongs to the field of fault diagnosis. By collecting the vibration signal of the rotor shaft of the steam turbine unit, the necessary calculation, analysis and judgment are carried out on the vibration data, the real-time calculation and storage of the power frequency vibration amplitude and phase value of the shaft relative vibration on both sides of the rotor, and the real-time verification of the shaft vibration power frequency vibration amplitude, Judging whether the amplitude of the shaft vibration and power frequency vibration on any side of the rotor is greater than the vibration amplitude threshold; combined with the least square method, the shaft vibration and power frequency vibration data are verified for the stability of the shaft vibration power frequency vibration amplitude trend at the working speed and the operating speed Real-time quantitative calculation and analysis such as the verification of the phase stability of the power frequency vibration phase trend of the lower shaft vibration. Combined with various verification results, automatic real-time online diagnosis of whether the rotor original mass imbalance fault occurs at the working speed of the unit. The invention has the advantages of scientific method, reliable conclusion, automatic real-time on-line monitoring, fault diagnosis and the like.

Description

technical field [0001] The invention belongs to the field of vibration state monitoring and fault diagnosis of rotating machinery, and in particular relates to a real-time diagnosis method for the original mass imbalance fault of a turbogenerator set rotor for real-time on-line automatic monitoring of the vibration state of a large turbogenerator set. Background technique [0002] Rotor primary mass imbalance refers to the imbalance that exists on the rotor before the rotor starts to rotate. They are usually produced during the manufacturing process, or caused by the replacement of rotating parts during maintenance. About 80% of the unit vibration failures that occur in the field are caused by the direct or indirect mass imbalance of the rotor. The unbalance of the original mass of the rotor is a relatively common vibration fault, and there are various reasons for the unbalance of the original mass. Inaccurate machining or uneven material during the manufacturing process m...

AI Technical Summary

Problems solved by technology

Inaccurate machining or uneven material during the manufacturing process makes the cross-section of the components on the rotor asymmetrical with respect to the central axis of rotation, or the residual deformation of the rotor during machining and heat treatment; the unevenness of the moving blades on the rotor during operation Uniform wear, uneven deposition of salt scale and dust, fracture and shedding of rotating parts; asymmetry of generator rotor windings or upper parts of steam turbine sleeve rotors; displacement of rotating parts due to rotor deformation, insufficient heat-fitting force, and steam force position, as well as the thermal deformation of the rotor during operation; the technical operations that may destroy the mass balance of the rotor during the installation and maintenance of the unit, etc., may become the cause of the original mass imbalance of the rotor.

[0003] The diagnosis of the original mass unbalance fault of the turbogenerator rotor is completed by experts with certain experience in field vibration fault diagnosis. The economic cost of diagnosis is high and the cycle is long.

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