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Method for measuring rotational inertia of steam turbine generator set

A technology of steam turbine generator set and moment of inertia, which is applied in the direction of measuring device, test of machine/structural components, test of static/dynamic balance, etc. The channel conversion system error cannot be estimated, the accuracy of a, n0, ω0 cannot be guaranteed, etc., to reduce the amount of system error, clear the physical concept, and overcome the large dynamic speed error

Active Publication Date: 2019-09-06
ZHEJIANG ZHENENG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The accuracy of on-site static speed measurement can generally reach 3000±1r / min, and the highest can reach 3000±0.1r / min. Even if the minimum error of ±0.1r / min is calculated, the error of △nτ / △t will increase by 2%-3.33% , which is obviously not allowed
However, in the current load shedding test, the acquisition object of the speed recording wave is selected as the speed signal transmitted by the DCS control system of the turbo-generator set, and the error of the A / D channel conversion system introduced by it is even more unpredictable.
If the measurement accuracy of the dynamic rotational speed of the rotor cannot be further improved, the accuracy of a, n0, and ω0 in the mathematical model will not be guaranteed, and the calculation accuracy of the moment of inertia will also be adversely affected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for measuring the moment of inertia of a steam turbine generator set, using the technical means of sine wave counting of the in-situ speed disc gear recording signal to calculate the dynamic speed of the rotor with high precision at the level of 1ms, and then use this speed to calculate the moment of inertia of the steam turbine generator set .

Embodiment 2

[0039] A method for measuring the moment of inertia of a steam turbine generator set, using the technical means of sine wave counting of the in-situ speed disc gear recording signal to calculate the dynamic speed of the rotor with high precision at the level of 1ms, and then use this speed to calculate the moment of inertia of the steam turbine generator set .

[0040] Preferably, the following steps are included:

[0041] (1) The sampling and recording equipment directly collects the sine wave signals of the local one to three speed disc gears, and simultaneously records the trigger time of the SOE signal of the generator outlet line switch and the SOE signal of the power grid circuit breaker switch;

[0042] (2) The sine wave signal of the speed disc gear obtained in step (1) is transmitted to the data background analysis software, the SOE signal is used as the trigger time, and 1 ms is used as the time recording axis to record the peak of each 1 ms within 20 to 80 ms before...

Embodiment 3

[0047] A method for measuring the moment of inertia of a steam turbine generator set, the main steps are as follows:

[0048](1) The sampling and recording equipment directly collects the sine wave signals of one to three speed disc gears on the spot with a resolution of 50kHz, and simultaneously records the triggering time of the SOE signal of the generator outlet line switch and the SOE signal of the power grid circuit breaker switch.

[0049] The sine wave signal of the speed disc gear obtained in step (1) is transmitted to the data background analysis software, the SOE signal is used as the trigger time, and 1 ms is used as the time recording axis to record the peak of every 1 ms within tens of ms before and after the trigger time (also available Defined as the trough) trigger times Tk.

[0050] From the number of triggers Tk obtained in step (2), calculate the dynamic rotor speed per 1 ms nk = 60000Tk / m, where m is the number of gears on the corresponding speed plate.

...

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PUM

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Abstract

The invention discloses a method for measuring the rotational inertia of a steam turbine generator set. On the basis of the technical way of sinusoidal wave counting of a local rotating disk gear recording signal, 1-ms-level high-precision dynamic rotor rotating speed is calculated and then the rotational inertia of a steam turbine generator set is calculated based on the rotating speed. Therefore, an overcome of large dynamic rotating speed error in the conventional rotating speed measurement method is overcome. The employed instruments and equipment are conventional ones and the employed data processing software is conventional function software. The method has advantages of clear physical concept, simple operation, and high measurement accuracy.

Description

technical field [0001] The invention relates to the measurement field of a steam turbine generator set, in particular to a method for measuring the moment of inertia of a steam turbine generator set. Background technique [0002] Moment of Inertia (Moment of Inertia) is the measure of inertia when a rigid body rotates around its axis (revolving object maintains its uniform circular motion or static characteristics), expressed by the letter I or J. In classical mechanics, the moment of inertia (also known as mass moment of inertia, referred to as moment of inertia) is usually represented by I or J, and the SI unit is kg m². For a particle, I = mr², where m is its mass and r is the perpendicular distance between the particle and the axis of rotation. The role of moment of inertia in rotational dynamics is equivalent to the mass in linear dynamics. It can be formally understood as the inertia of an object for rotational motion, and is used to establish the relationship between...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M1/10
CPCG01M1/10
Inventor 谢尉扬戴敏敏宋振明蒋宇轩钟佳华鲍丽娟习超
Owner ZHEJIANG ZHENENG ELECTRIC POWER
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