Rotor vibration protection method based on harmonic component decomposition

Abstract

The invention discloses a rotor vibration protection method based on harmonic component decomposition. Shaft vibration data from a front bearing bush and a rear bearing bush on the same rotor are acquired, and subjected to harmonic component decomposition to obtain X-direction and Y-direction rotor first-order vibration in-phase components; vibration conditions of the rotor are determined through variation and comparison of such data, and then a determination can be made on whether trip protection is carried out. Compared with the prior art, the rotor vibration protection method based on harmonic component decomposition has the following advantages: monitoring the vibration of the entire rotor can be achieved through analysis of the vibration data from the bearing bushes for a front shaft and a rear shaft; moreover, with sectionalized protection set up for shaft vibration values, and protection maloperation caused by single-point protection is avoided, and the case of falsely triggered trip can be effectively avoided; according to tracking of values within normal periods of time, a reference base can be updated in real time and abnormal conditions of rotor vibration can be determined rapidly, and accordingly, a determination can be made on whether trip is triggered. In such a way, the case that protection is influenced by frequent trip of the unit that is oversensitive due to interference of background vibration in some situations is avoided.

Description

technical field [0001] The invention relates to the technical field of generator set vibration protection, in particular to a rotor vibration protection method based on harmonic component decomposition. Background technique [0002] When the steam turbine has a vibration failure, it often leads to some adverse consequences, which greatly affects the normal operation and production of the steam turbine, and even leads to the destruction of the whole steam turbine. Because once abnormal vibration occurs, the components in the unit will be subject to large dynamic stress, which will easily lead to fatigue and damage to the components, and the bolts and nuts in the unit will also easily loosen during abnormal vibration, causing steam Leakage occurs, and in severe cases, it will cause the main shaft to bend. In order to protect the equipment safety and operation safety of the turbo-generator set, most large-scale generators are equipped with the monitoring and protection system ...

AI Technical Summary

Problems solved by technology

The reflection of the corresponding mass imbalance in the shaft system is also getting smaller and smaller. In some mega-kilowatt steam turbines, when faults such as broken blades occur, the maximum vibration value does not exceed the tripping value, and the existing protection methods cannot be effectively implemented. protective action

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