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Secondary sampling method for speed-measuring fluted disc teeth number of self-adapting large steam turbine generator

A technology of self-adaptive measurement and speed measurement gear plate, which is applied in the direction of engine testing, machine/structural component testing, vibration measurement, etc. It can solve the problems that it is not easy to form a simple and reliable device, it is not easy to analyze and calculate in real time, and it is not easy to realize. , to achieve the effect of easy implementation, solving the problem of subsynchronous oscillation, and low cost

Active Publication Date: 2008-08-13
BEIJING SIFANG JIBAO AUTOMATION
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Problems solved by technology

Because the high-speed AD acquisition card generally cannot be used separately from the PC, it is not easy to form a simple and reliable device; in addition, the amount of data generated by the high-speed AD is relatively large, which not only requires the CPU to have a strong data processing capability, but also is not easy to realize data processing. Real-time analysis and calculation also makes it difficult to implement such schemes in relay protection devices

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  • Secondary sampling method for speed-measuring fluted disc teeth number of self-adapting large steam turbine generator
  • Secondary sampling method for speed-measuring fluted disc teeth number of self-adapting large steam turbine generator
  • Secondary sampling method for speed-measuring fluted disc teeth number of self-adapting large steam turbine generator

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Embodiment Construction

[0020] The technical solution of the present invention will be further elaborated according to the drawings in the description. Technical scheme of the present invention is specifically as follows:

[0021] Use a single-chip microprocessor to measure the arrival time of each generator speed pulse (hereinafter referred to as the speed pulse): t n , t n+1 , t n+2 ...and the arrival time of each sampling pulse: t s , t s+1 , t s+2 ...As shown in Figure 1, the moment when the rising edge of each pulse arrives is taken as the arrival time of the pulse, and recorded;

[0022] by the period t of two adjacent pulses n+1 -t n , and the number of teeth N of the tachometer tooth disc to calculate the average rotational speed ω between two adjacent pulses n :

[0023] ω n = 2 π N ( t n ...

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Abstract

The invention relates to a measuring method of shaft torsional vibrations of 300MW, 600MW, 1000MW large turbogenerator unit of heat power generation, disclosing a method of self-adapting velocity-measuring tooth disc tooth number. The method firstly measures transient speed of the generator by perimeter measuring method, then processing secondary sampling with uniformly-face and fixed sampling frequency for the speed data via linear interpolation, further obtaining real-time speed data with equal space and fixed frequency sampling frequency irrelevant to tooth number of the generator, which reduces influence on trailing torsion calculation caused by inconsistency of tooth number of the velocity-measuring tooth disc. For the velocity tooth disc with different tooth numbers, sampling data with same sampling frequency and equal sampling space can be obtained measured by the method. The method unifies sampling rate of output data, reduces complexity level of processing link of trailing data, at the same time, guarantees reliability and precision of the data. The method is a basis for accomplishing measurement of shaft torsional vibrations, which is an important link for safe and stable operation of the generator unit.

Description

technical field [0001] The invention relates to the technical field of torsional vibration protection for large-scale steam turbine generator sets or large-capacity motors in power systems and thermal power plants, and more particularly relates to an instantaneous speed measurement method for the number of teeth of an adaptive speed-measuring gear plate. Background technique [0002] Large-scale thermal turbine technology is one of the key equipment of major equipment in my country, and the large-scale construction of power plants is the guarantee for the rapid development of my country's industry. The shafting of high-power units has the characteristics of light weight and flexibility, multiple supports, large span, and high power density. The utilization factor of generator materials is improved, and the power density of the shafting section is relatively increased. The natural frequency spectrum of the system is relatively dense, and the energy induced by vibration is low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M15/00G01H1/10G01P3/481
Inventor 刘博阳刘全常富杰李元盛
Owner BEIJING SIFANG JIBAO AUTOMATION
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