Counter weight method for hydro-generator rotor dynamic balancing test

Abstract

The invention discloses a counterweight method for a hydroelectric generator rotor dynamic balance test, which includes: separately testing the vibration parameters of the hydroelectric generator set under different rotational speeds and different excitation current conditions, analyzing the vibration characteristics, and estimating the initial weight and position of the test weight ;According to the estimated weight and position of the trial weight, a number of magnetic bases are adsorbed to a certain position of the generator rotor; start the machine again for variable speed and variable excitation tests, and analyze whether the trial weight and position are appropriate; process and manufacture according to the calculation results Permanent counterweight, remove the magnetic base, weld and fix the counterweight at the final counterweight position; turn on the machine again to test the vibration data under rated speed and rated voltage, and analyze and evaluate the counterweight effect; the biggest feature of this method is The counterweight of the magnetic base does not need to be welded, and it is convenient to install, move and change the weight, and the magnetic base can be reused, so it has a good application prospect.

Description

technical field [0001] The invention belongs to the field of hydraulic generator sets, and relates to a counterweight method for a dynamic balance test of a hydraulic generator rotor. Background technique [0002] The unbalanced mass of hydroelectric generator rotor (namely dynamic unbalanced) is one of the main causes of vibration of hydroelectric unit. In recent years, hydropower units have been developing towards giant units, resulting in large rotors with large weight and assembled on site by many parts. However, the on-site assembly process is difficult to ensure its mass balance, and it is not easy to carry out static balance work. Even if the rotor has been subjected to a static balance test, there will still be dynamic imbalance after operation. When the newly installed or overhauled hydro-generator set is started for the first time, if the dynamic unbalance of the rotating body is obvious, and the vibration amplitude exceeds the standard allowable value, when the...

AI Technical Summary

Problems solved by technology

Welding and dismantling (trial) counterweights on the rotor for many times is not only a heavy workload, time-consuming and labor-intensive, but also has great potential safety hazards, especially for high-speed units (such as pumped storage units), whose power generation The diameter of the machine rotor is relatively small, the height of the yoke is relatively large, and the working space is often small, which has a great impact on the work of adding counterweight