Vibration testing device for hydropower unit in hydropower station and vibration attenuation implementing method of vibration testing device

Abstract

The invention discloses a vibration testing device for a hydropower unit in a hydropower station, comprising four horizontal vibration sensors, a magnetic approach switch, a magnetic sheet type fixed reference point and a signal acquisition instrument, wherein the four horizontal vibration sensors are respectively fixed on an upper rack and a lower rack which are used as two supporting legs; the magnetic approach switch is fixed on the upper rack; the magnetic sheet type fixed reference point is fixed on a rotating shaft; and the horizontal vibration sensors and the magnetic approach switch are respectively connected with the signal acquisition instrument. A vibration attenuation implementing method of the vibration testing device comprises the following steps of: starting up the hydropower unit to test sensor signals of the hydropower unit under different loads; determining an unbalance mass position according to a test curve; carrying out equal-mass weight distribution on the upper end surface and the lower end surface of a rotor of the unit, and testing by changing mass of a distributed weight in equal proportion; and determining the masses of the distributed weights on the upper end surface and the lower end surface of the rotor of the hydropower unit according to the vibration test amplitude values of the two weight distributions. The vibration testing device is simple in structure, and the vibration attenuation implementing method is easy to implement, high in efficiency and capable of synchronously reducing vibration of the hydropower unit caused by a machine, a water flow and an unbalanced magnetic force so as to prolong the service life of the hydropower unit.

Description

Technical field [0001] The invention belongs to vibration testing and control of a hydraulic unit of a hydropower station, in particular to a vibration testing device for a hydraulic unit of a hydropower station and a vibration reduction implementation method thereof. Background technique [0002] On August 17, 2009, a major safety accident occurred at the Sayano-Shushenskaya Hydropower Station. First, there was a loud noise near the 2# unit, and then the top cover and rotor of the 2# turbine were shot out, and the water column was sprayed from the cavity at the turbine into the main unit. The factory building eventually caused the disastrous consequences of flooding the factory building, machine crash and death. The warnings obtained from the major safety accident of the Sayano-Shushenskaya hydropower station should attract the attention of my country's water conservancy industry. According to the post-accident analysis, the excessive vibration of the unit was one of the i...

AI Technical Summary

Problems solved by technology

[0002] On August 17, 2009, a major safety accident occurred at the Sayano-Shushenskaya Hydropower Station. First, there was a loud noise near the 2# unit, and then the top cover and rotor of the 2# turbine were shot out, and the water column was sprayed from the cavity at the turbine into the main unit. The factory building, eventually causing the disastrous consequences of flooding the factory building, machine crash and death

This method is more complicated, and needs to switch on and off the unit multiple times, generally not less than 5 times

Moreover, the impact of unit load changes was not considered during the test, so that the experiment could not minimize the vibration of the hydraulic unit

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