Method for measuring inherent frequency of stator core/support system of water turbine generator prototype

A technology for hydroelectric generators and generator stators, which is applied to measuring devices, testing of mechanical components, and testing of machine/structural components. The effect of convenient point layout, significant safety and economic benefits

Active Publication Date: 2016-01-27
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0003] The purpose of the patent of the present invention is to provide a method for measuring the natural frequency of the stator core-stator frame of a large-scale hydroelectric generator set, wh

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  • Method for measuring inherent frequency of stator core/support system of water turbine generator prototype
  • Method for measuring inherent frequency of stator core/support system of water turbine generator prototype
  • Method for measuring inherent frequency of stator core/support system of water turbine generator prototype

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[0028] The present invention will be further described below with reference to the drawings and embodiments.

[0029] Such as figure 1 As shown, a method for measuring the natural frequency of the stator core-frame system of a hydraulic generator prototype includes the following steps:

[0030] Step 1: Install the sensor at the test point;

[0031] The sensors installed at the test points include acceleration sensors and vibration displacement sensors, all of which are installed on the vertical ribs of the stator frame;

[0032] Step 2: Adjust the operating conditions of the turbine generator unit to no-load;

[0033] Step 3: When the PID control parameters of the governor under no-load conditions are the optimal parameters, set the governor frequency given value and change the generator rotor speed;

[0034] When the PID control parameter under no-load condition is the optimal parameter, the unit frequency fluctuation under no-load condition is ≤±1.5% of the rated frequency;

[0035] The...

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Abstract

The invention discloses a method for measuring the inherent frequency of a stator core/support system of a water turbine generator prototype. Through arrangement of an automatic excitation regulator, the terminal voltage of a hydropower unit is kept at a rated value. By setting a given value of the zero load frequency, the method changes the rotational speed of a generator rotor. Thereby the method changes an excitation input of the stator core/support system, i.e. the generator rotor rotation magnetic field force wave rotational speed, and measures a frequency response function of the stator core/support system of the water turbine generator prototype under electromagnetic force excitation of different frequency. According to the frequency response function, a frequency value corresponding to the maximum amplitude can be found, and the frequency value is the inherent frequency of the stator core/support system of the water turbine generator prototype. The method only needs to stop the generator and install a sensor, does not need to apply for heavy maintenance, is simple and convenient in measurement, and thus has a wide application prospect in the field of inherent frequency measurement of stator core/support systems of water turbine generator sets.

Description

technical field [0001] The invention relates to a method for measuring the natural frequency of a hydroelectric generator structure, in particular to a method for measuring the natural frequency of a stator core-frame system of a prototype hydroelectric generator. Background technique [0002] In engineering practice, there are various types and complex structures of hydroelectric generators. Units with different capacities adopt different structures. For example, for large or giant units, the rotor often adopts an oblique arm structure, and the stator adopts an oblique vertical rib structure, while some units have a box-shaped rotor structure and radial radial vertical ribs on the stator frame. . In engineering practice, there is often a problem that the core-stator frame vibration of large-scale hydro-generator sets is relatively large, and the natural frequency of the stator core and the stator core-stator frame needs to be measured. The natural frequency measurement me...

Claims

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Application Information

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IPC IPC(8): G01M13/00G01H17/00
Inventor 寇攀高吴长利雷文胜肖剑付亮田海平
Owner STATE GRID CORP OF CHINA
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