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Rapid dynamic balancing method of pumped storage unit based on precise test weight combined with influence coefficient method

A technology of pumped storage unit and influence coefficient method, which is applied in static/dynamic balance test, machine/structural component test, instrument, etc., can solve the problems of high cost, waste of time and expense, long time, etc., and achieve reduction Small vibration, fast and effective effect of dynamic balance work

Active Publication Date: 2020-12-15
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the equipment required for the 3-time start method is simple, the disadvantages are: poor precision, and it needs to add 3 trial weights to balance a plane, start the machine 4 times, waste time and cost, and cost high
[0003] In addition, the influence coefficient method used in the prior art has the defect that when the weight is added for the first time, it is necessary to select a part that can cause a large change in the amplitude of the vibration measuring point to carry out the test weight.
At present, it is difficult to accurately measure the first test loading angle of large and medium-sized units. If the test key position is not selected well, it will lead to large calculation errors of the influence coefficient and poor counterweight effect. At this time, the test key position should be re-selected, and then the counterweight calculation should be performed. , also has the defects of long time, low efficiency and high cost

Method used

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  • Rapid dynamic balancing method of pumped storage unit based on precise test weight combined with influence coefficient method
  • Rapid dynamic balancing method of pumped storage unit based on precise test weight combined with influence coefficient method
  • Rapid dynamic balancing method of pumped storage unit based on precise test weight combined with influence coefficient method

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Effect test

Embodiment 1

[0044] Such as figure 1 with figure 2 As shown, a rapid dynamic balancing method for pumped storage units based on precise test weight combined with influence coefficient method includes the following steps:

[0045] (l) Installation of measuring points before unit start-up: Install vertical vibration sensor 6 on upper frame, horizontal vibration sensor 7 on upper frame, vertical vibration sensor 8 on lower frame, and vertical vibration sensor 8 on lower frame before starting the unit. The horizontal vibration sensor 9 is used to measure the vibration at the upper guide bearing 1 and the lower guide bearing 2. A photoelectric sensor 5 is installed on the exposed journal surface of the upper cover of the water guide bearing 3, and a reflective tape is pasted on the generator rotor 4 here to measure the phases of the horizontal and vertical vibrations of the upper frame and the lower frame;

[0046] (2) The unit slowly opens the guide vanes to increase the speed under the wor...

Embodiment 2

[0071] The present invention will be further described below by taking the field dynamic balance test of No. 4 generating set of a certain pumped storage power station as an example.

[0072] 1) First arrange the measuring points, a total of 5 measuring points are arranged, including: vertical vibration sensor 6 on the upper frame, horizontal vibration sensor 7 on the upper frame, vertical vibration sensor 8 on the lower frame, and horizontal vibration sensor 9 on the lower frame. A photoelectric sensor 5 is installed on the exposed journal surface of the upper cover of the guide bearing 3, and a reflective tape is pasted on the generator rotor 4 here to measure the vibration phase of the upper frame and the lower frame. See figure 2 .

[0073] 2) Test the original vibration condition of the unit, stabilize the speed of the unit at 60%, 70%, 80%, 90% and 100% of the rated speed respectively, and use a vibration tester to record the upper and lower racks of the unit at differ...

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Abstract

The invention discloses an accurate trial mass and influence coefficient method combined rapid dynamic balance method for pump storage groups. The method comprises the following steps of: before a group is started, respectively mounting an upper rack vertical vibration sensor, an upper rack horizontal vibration sensor, a lower rack vertical vibration sensor and a lower rack horizontal vibration sensor on an upper rack and a lower rack, mounting a photoelectric sensor on a journal exposed from an upper cover of a water guide bearing, pasting a reflective tape on a rotor of a power generator, slowly starting a guide vane to improve the speed when the group is in a working condition of a water turbine, and starting to acquire vibration data of the upper rack and the lower rack after stably running under different rotation speed working conditions of the water turbine for a set time; carrying out spectral analysis on the vibration data of the upper rack and the lower rack; checking influences, on the vibration of the group, of unbalanced magnetic pull; carrying out accurate counterweighting on the upper and lower end surfaces of the rotor of the power generator, carrying out analysis after the counterweighting, and if the upper and lower surfaces do not reach the standard, carrying out correction by using an influence coefficient method to calculate the size and direction of re-counterweighting; and after the vibration of the group in the working condition of the water turbine is qualified, verifying the working condition of a water pump.

Description

technical field [0001] The invention relates to the technical field of hydroelectric generator sets, in particular to a fast dynamic balancing method for a pumped-storage energy storage unit using an accurate test weight combined with an influence coefficient method. Background technique [0002] The pumped storage unit is a high-head vertical-axis reversible device. Due to its huge weight and complex operating conditions, there are defects such as unit vibration and swing exceeding the standard, which can easily damage various parts of the unit and seriously threaten the water turbine. The service life of the generator set. In the prior art, the dynamic balance test of the hydro-generator unit is an important measure to improve the operation quality and service life of the hydro-generator unit, and is one of the important methods to reduce the vibration and swing of the unit. For low-speed machines, especially hydroelectric generating sets, the speed is usually 60-300r / mln...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M1/16G01M1/32
Inventor 宋斌程惠涛刘玉智
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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