CN113567730B - Generator shaft voltage measurement method based on rotating speed signal - Google Patents
Generator shaft voltage measurement method based on rotating speed signal Download PDFInfo
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- CN113567730B CN113567730B CN202110909275.7A CN202110909275A CN113567730B CN 113567730 B CN113567730 B CN 113567730B CN 202110909275 A CN202110909275 A CN 202110909275A CN 113567730 B CN113567730 B CN 113567730B
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- 238000000691 measurement method Methods 0.000 title description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 24
- 238000012360 testing method Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 claims description 18
- 230000008859 change Effects 0.000 claims description 14
- 238000001179 sorption measurement Methods 0.000 claims description 6
- 230000003068 static effect Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- General Physics & Mathematics (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a generator shaft voltage measuring method based on a rotating speed signal. The photoelectric speed measuring sensor and the carbon brush fixed on the insulating connecting rod can measure the rotating speed and the voltage signal of the generator at the same time during testing, the multi-channel data acquisition device acquires the voltage amplitude corresponding to different rotating speeds from static to rated rotating speed after the generator runs, and finally the data acquisition device transmits the acquired data to the computer and displays the effective values and waveforms of the rotating speed and the shaft voltage of the generator. The invention can test the values and waveforms of the corresponding shaft voltages at different rotating speeds and can obtain the values and waveforms of the corresponding shaft voltages at different powers on the premise of obtaining the rotating speed characteristics. The invention makes up the blank of measuring the generator shaft voltage under different working conditions and can effectively help the measurer to prevent the damage caused by the shaft voltage.
Description
Technical Field
The invention belongs to the technical field of wind driven generator detection, relates to a generator shaft voltage testing method, and in particular relates to a generator shaft voltage measuring method based on a rotating speed signal.
Background
When the rotating shaft of the generator rotates, as long as unbalanced magnetic fluxes are interlinked on the rotating shaft, induced electromotive force is generated at the end of the rotating shaft to form shaft voltage, and when the shaft voltage reaches a certain value, oil films are broken down, so that the rotating shaft and a bearing are damaged, and the normal operation of the generator is affected.
At present, shaft voltage tests of wind driven generators are mostly carried out when leaving factories, but few in-service wind driven generator sets are measured. When the shaft voltage measurement is carried out on an in-service wind driven generator, a universal meter is generally adopted for direct measurement. During testing, the shaft voltage is led into the measuring multimeter from the rotating shaft, and the test risk is high. The effective value of the shaft voltage is measured by using a universal meter, and the shaft voltage variation waveform cannot be displayed.
In addition, the voltage of the generator shaft in service is simply measured, and the rotating speed and the power of the generator during measurement are not required. The simple measurement cannot effectively establish the corresponding relation of the rotation speed, the power and the shaft voltage of the generator, and further the change trend of the predicted shaft voltage cannot be found, and the damage of the shaft voltage to the generator cannot be prevented.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a generator shaft voltage measuring method based on a rotating speed signal, which has the advantages that shaft voltage measurement can be carried out on an in-service wind generating set generator, an effective value and a change waveform of the measured shaft voltage can be effectively displayed, and meanwhile, the corresponding relation between different generator rotating speeds, power and shaft voltage can be effectively established through measuring the generator rotating speed and converting the power.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the generator shaft voltage measuring method based on the rotating speed signal comprises the following testing steps:
1) Fixing a magnetic adsorption device on the end face of the driving end of the generator shell;
2) Setting a rotating speed characteristic curve of the test generator on a computer according to model parameters of the generator;
3) Connecting the magnetic adsorption device with a multifunctional insulating rod, and erecting the multifunctional insulating rod to a proper position convenient for placing the carbon brush and the photoelectric speed sensor;
4) Mounting a photoelectric speed measurement sensor and a carbon brush, attaching a reflective sticker to the rotating shaft surface of the driving end of the generator, and adjusting the photoelectric speed measurement sensor to enable the transmitting end of the photoelectric speed measurement sensor to be aligned to the reflective sticker;
5) The multifunctional insulating rod and the carbon brush pressure spring are adjusted in a linkage way, so that the carbon brush can be tightly attached to the rotating shaft surface of the driving end of the generator;
6) Removing a carbon brush grounded to a driving end of the generator, and preparing for measuring the change of the shaft voltage in the state that the generator is not grounded;
7) Starting the generator to enable the generator to rise to the rated rotation speed from rest, and automatically collecting rotation speed and voltage signals by the data collector and transmitting the rotation speed and voltage signals to the computer;
8) The computer obtains corresponding shaft voltage amplitude values and variation waveforms at different generator rotating speeds;
9) The computer generates corresponding shaft voltage amplitude and change waveform under different powers according to the rotating speed characteristic curve of the generator set by budget;
10 Connecting the generator driving end with a grounding carbon brush, and measuring the change of the shaft voltage along with the rotating speed and the power in the grounding state of the generator;
11 And (3) repeating the steps 7) to 10), and collecting two groups of shaft voltage values under the condition that whether the generator grounding carbon brush is grounded or not to finish the test.
Compared with the prior art, the invention has the following advantages:
The method can be used for carrying out shaft voltage measurement on the in-service wind generating set generator, can effectively display the effective value and the change waveform of the measured shaft voltage, and can effectively establish the corresponding relation between different generator rotating speeds and power and the shaft voltage through measuring the generator rotating speeds and converting the power. The invention makes up the blank of measuring the generator shaft voltage under different working conditions and can effectively help the measurer to prevent the damage caused by the shaft voltage.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a rotational speed characteristic of the generator.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
1) Because of the limitation of conditions such as the closing source property of each data port of the wind turbine generator and the measurement accuracy of the rotating speed sensor, the rotating speed information of the generator cannot be obtained according to the existing rotating speed sensor of the wind turbine generator. For the simple measurement method and the speed measurement step, the invention selects the photoelectric speed measurement sensor to be matched with the reflective sticker to measure the rotating speed of the rotating shaft of the generator.
2) Because the operation of measuring the power of the in-service wind generating set is complex, the on-site wiring quantity is large, and the related measuring equipment is more, the invention converts the rotating speed into corresponding power through a computer according to the rotating speed characteristic curve of the tested generator.
3) In order to enable the carbon brush to be closely attached to the rotating shaft of the generator and ensure the accuracy of the test voltage, the shaft voltage of the generator is measured by adopting the carbon brush with the pressure spring.
4) In order to ensure the real-time correspondence of the rotation speed and the shaft voltage of the generator, a data acquisition device is adopted to acquire the rotation speed and the voltage signals simultaneously.
5) And converting the power corresponding to different rotating speeds by adopting a computer according to a rotating speed characteristic curve of the generator, displaying and recording an effective value and a change waveform of the generator shaft voltage by the computer, and establishing a corresponding relation of the rotating speed, the power and the shaft voltage of the generator.
The generator shaft voltage measuring method based on the rotating speed signal comprises the following testing steps:
1) Fixing a magnetic adsorption device on the end face of the driving end of the generator shell;
2) Setting a rotating speed characteristic curve of the test generator on a computer according to model parameters of the generator, as shown in fig. 2;
3) Connecting the magnetic adsorption device with a multifunctional insulating rod, and erecting the multifunctional insulating rod to a proper position convenient for placing the carbon brush and the photoelectric speed sensor;
4) Mounting a photoelectric speed measurement sensor and a carbon brush, attaching a reflective sticker to the rotating shaft surface of the driving end of the generator, and adjusting the photoelectric speed measurement sensor to enable the transmitting end of the photoelectric speed measurement sensor to be aligned to the reflective sticker;
5) The multifunctional insulating rod and the carbon brush pressure spring are adjusted in a linkage way, so that the carbon brush can be tightly attached to the rotating shaft surface of the driving end of the generator;
6) Removing a carbon brush grounded to a driving end of the generator, and preparing for measuring the change of the shaft voltage in the state that the generator is not grounded;
7) Setting a data collector, wherein the sampling frequency is 90Hz, and the output data with the average value of 0.01s is used as an effective value;
8) Starting the generator to enable the generator to rise to the rated rotation speed from rest, and automatically collecting rotation speed and voltage signals by the data collector and transmitting the rotation speed and voltage signals to the computer;
9) The computer obtains corresponding shaft voltage amplitude and change waveform under different generator rotating speeds, wherein the step length of the rotating speed is 100rpm (the testing personnel pay attention to the voltage values of the rotating speed at 500rpm, 1000rpm, 1500r/min and 1700 rpm);
10 The computer generates corresponding shaft voltage amplitude and change waveform under different powers according to the rotating speed characteristic curve of the generator set by budget, wherein the power step length is 100kW (the power is focused on voltage values of 500kW, 1000kW and rated power by a tester);
11 Connecting the generator driving end with a grounding carbon brush, and measuring the change of the shaft voltage along with the rotating speed and the power in the grounding state of the generator;
12 And 8) repeating the steps 8) to 11), and collecting two groups of shaft voltage values under the condition that whether the generator grounding carbon brush is grounded or not to finish the test.
The foregoing is merely illustrative of specific embodiments of the present invention, and the scope of the invention is not limited thereto, but any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present invention will be apparent to those skilled in the art within the scope of the present invention.
Claims (1)
1. The generator shaft voltage measuring method based on the rotating speed signal is characterized by comprising the following testing steps:
1) Fixing a magnetic adsorption device on the end face of the driving end of the generator shell;
2) Setting a rotating speed characteristic curve of the test generator on a computer according to model parameters of the generator;
3) Connecting the magnetic adsorption device with a multifunctional insulating rod, and erecting the multifunctional insulating rod to a proper position convenient for placing the carbon brush and the photoelectric speed sensor;
4) Mounting a photoelectric speed measurement sensor and a carbon brush, attaching a reflective sticker to the rotating shaft surface of the driving end of the generator, and adjusting the photoelectric speed measurement sensor to enable the transmitting end of the photoelectric speed measurement sensor to be aligned to the reflective sticker;
5) The multifunctional insulating rod and the carbon brush pressure spring are adjusted in a linkage way, so that the carbon brush can be tightly attached to the rotating shaft surface of the driving end of the generator;
6) Removing a carbon brush grounded to a driving end of the generator, and preparing for measuring the change of the shaft voltage in the state that the generator is not grounded;
7) Starting the generator to enable the generator to rise to the rated rotation speed from rest, and automatically collecting rotation speed and voltage signals by the data collector and transmitting the rotation speed and voltage signals to the computer;
8) The computer obtains corresponding shaft voltage amplitude values and variation waveforms at different generator rotating speeds;
9) The computer generates corresponding shaft voltage amplitude and change waveform under different powers according to the rotating speed characteristic curve of the generator set by budget;
10 Connecting the generator driving end with a grounding carbon brush, and measuring the change of the shaft voltage along with the rotating speed and the power in the grounding state of the generator;
11 And (3) repeating the steps 7) to 10), and collecting two groups of shaft voltage values under the condition that whether the generator grounding carbon brush is grounded or not to finish the test.
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| CN202110909275.7A CN113567730B (en) | 2021-08-09 | 2021-08-09 | Generator shaft voltage measurement method based on rotating speed signal |
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| CN202110909275.7A CN113567730B (en) | 2021-08-09 | 2021-08-09 | Generator shaft voltage measurement method based on rotating speed signal |
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| CN113567730B true CN113567730B (en) | 2024-05-24 |
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Families Citing this family (1)
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| CN114646797A (en) * | 2022-03-17 | 2022-06-21 | 山东沃翔智慧能源科技有限公司 | Wind driven generator shaft voltage on-line monitoring device and early warning method |
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