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A Method of Measuring Moment of Inertia of Turbine Generator Set

A steam turbine generator set, moment of inertia technology, applied in the direction of measuring device, machine/structural component test, static/dynamic balance test, etc., can solve the problem of unpredictable error of A/D channel conversion system and calculation accuracy of moment of inertia Unfavorable effects, accuracy cannot be guaranteed, etc., to achieve the effect of clear physical concept, improved measurement accuracy, and improved measurement accuracy

Active Publication Date: 2021-06-25
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, the highest can reach 3000±0.1r / min, even if calculated with the minimum error of ±0.1r / min, △n τ The / △t error will also 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 speed of the rotor cannot be further improved, a, n in the mathematical model 0、 ω 0 The accuracy will also 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 counting the sine wave of the local speed disk 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 counting the sine wave of the local speed disk 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 triggering 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, and the SOE signal is used as the trigger time, and 1 ms is used as the time recording axis to record the peak every 1 ms within 20-80 ms be...

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 trigger time of the SOE signal of the generator outlet line switch and the SOE signal of the power grid circuit breaker switch.

[0049] (2) The sine wave signal of the speed disc gear obtained in step (1) is transmitted to the data background analysis software, and the SOE signal is used as the trigger time, and 1 ms is used as the time recording axis to record the peak every 1 ms within tens of ms before and after the trigger time (It can also be defined as a trough) the number of triggers T k .

[0050] (3) The number of triggers T obtained from step (2) k , calculate the dynamic rotor speed n every 1ms k =60000T k / m, where m is the number of corresponding speed d...

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Abstract

The invention discloses a method for measuring the moment of inertia of a steam turbine generator set, which uses the technical means of counting the sine wave of the gear recording signal of the in-situ speed plate to calculate the dynamic speed of the rotor with high precision at the level of 1 ms, and then uses the speed to calculate the steam turbine Moment of inertia of generator set. The method for measuring the moment of inertia of a steam turbine generator set of the present invention overcomes the unfavorable factor of large dynamic speed error in the conventional speed measurement method. It has the 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] The moment of inertia (Moment of Inertia) is the measure of the inertia of a rigid body when it rotates around its axis (the characteristic that a rotating object maintains its uniform circular motion or static), expressed by the letter I or J. In classical mechanics, the moment of inertia (also known as mass moment of inertia, referred to as inertial moment) is usually represented by I or J, and the SI unit is kg m 2 . For a particle, I=mr 2 , where m is its mass, and r is the vertical 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...

Claims

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Application Information

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Patent Type & Authority Patents(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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