Phase difference aided diagnosis method for shafting vibration of turbo generator unit and system thereof

Abstract

The invention relates to a phase difference aided diagnosis method for shafting vibration of a turbo generator unit and a system thereof. The method comprises the following steps: setting a plurality of measuring points on a rotor, identifying and judging phases among vibration signals at the measuring points, taking vibration caused by pure mass unbalance as typical excitation force vibration and vibration caused by other factors as atypical excitation force vibration, wherein, the vibration signals at the bearing bushes of a turbo generator unit shafting generated under the action of an atypical excitation force generate abnormal vibration phase difference which is different from a pure dynamic unbalance fault, otherwise, the vibration signals at the bearing bushes only generated under the action of the typical excitation force maintain phase difference normality for the pure dynamic unbalance fault; and if the phase difference meets the conditions, judging that a rotor is only applied with the typical excitation force, otherwise, judging that the shafting is applied with an obvious atypical excitation force.

Description

technical field [0001] The invention relates to a phase difference auxiliary diagnosis method and system for the shafting vibration of a steam turbine generator set. Background technique [0002] Shafting vibration of turbogenerator is one of the most frequent and serious faults in power plant equipment. Accurate vibration cause analysis is the key technical basis for correct and quick vibration fault treatment. Factors that cause vibration of the shafting of the turbogenerator include but are not limited to the following aspects: friction between the rotor and stationary parts, mass imbalance of the rotor itself, oil film whirl at the rotor support bearing, and friction in the high-pressure steam area. The steam eddy, the generator rotor coil is short-circuited, and the magnetic force center of the generator rotor is shifted. The vibration signal measured on site is the comprehensive response produced by the superposition of the above-mentioned factors. How to decouple the...

AI Technical Summary

Problems solved by technology

In fact, the above-mentioned decoupling analysis cannot completely separate the mass imbalance from other factors. For example, the vibration spectrum of abnormal vibration caused by some local friction is very similar to that of the pure rotor mass imbalance. Using the above-mentioned decoupling theory, then Difficult to judge whether there is a quality imbalance

In this way, the fault processing time and / or workload will be increased, and the cost of fault processing will be increased; the best processing time will be delayed or lost, resulting in unnecessary economic losses or even damage to unit equipment and / or personal injury

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