CN111121945A - High-sensitivity distributed transformer vibration monitoring system - Google Patents
High-sensitivity distributed transformer vibration monitoring system Download PDFInfo
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- CN111121945A CN111121945A CN201911191465.9A CN201911191465A CN111121945A CN 111121945 A CN111121945 A CN 111121945A CN 201911191465 A CN201911191465 A CN 201911191465A CN 111121945 A CN111121945 A CN 111121945A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 24
- 230000003287 optical effect Effects 0.000 claims abstract description 25
- 238000005259 measurement Methods 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 239000004973 liquid crystal related substance Substances 0.000 claims description 2
- 239000013307 optical fiber Substances 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
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- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention relates to a high-sensitivity distributed transformer vibration monitoring system, which comprises: 980nm pump light, an isolator, a coupler, a wavelength division multiplexer, a DFB laser, an optical switch, an interferometer, a photoelectric detector, a data acquisition card and a phase demodulation system. Compared with the prior art, the sensing system has the advantages that: the sensor has the advantages of electromagnetic interference resistance, high sensitivity, large bandwidth, small volume and transformer oil corrosion resistance.
Description
Technical Field
The invention relates to the technical field of transformer vibration monitoring, in particular to a high-sensitivity distributed transformer vibration monitoring system.
Background
The power transformer is one of the core devices of the power system, and is directly related to whether the power grid can operate safely and efficiently. Once the transformer fails, the whole power supply system cannot operate normally, so that immeasurable economic loss is caused, and even the life and property safety of people is threatened. Therefore, monitoring of the running state of the transformer can be carried out, potential fault threats of the transformer can be found and early warned in time, and therefore operation scheduling personnel can take effective measures in time, abnormity is eliminated, and damage and more serious accidents of equipment are avoided. Compared with the traditional electric vibration monitoring mode, the vibration sensor based on the distributed feedback laser (DFB) overcomes the defects that the vibration sensor is easy to be interfered by an electromagnetic field, has large volume, is difficult to maintain, has low measurement precision and the like, and has wide application prospect in strong electromagnetic field interference occasions such as vibration monitoring of the transformer.
However, there are few integration schemes for the field of transformer vibration monitoring, and other existing monitoring schemes for this field have poor performance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a high-sensitivity distributed transformer vibration monitoring system.
The purpose of the invention can be realized by the following technical scheme:
a high-sensitivity distributed transformer vibration monitoring system, the system comprising: pump light source, optoisolator, coupler, wavelength division multiplexer, DFB laser instrument, photoswitch, interferometer, photoelectric detector, data acquisition card and phase demodulation procedure, wherein:
the pumping light source is used as a light source of the DFB laser;
the optical isolator is connected with the pumping light source and is used for isolating the backscattered laser;
the coupler is connected with the optical isolator and is used for splitting the pump light to perform distributed measurement;
the wavelength division multiplexer is respectively connected with the coupler and the DFB laser and is used for splitting the backscattered laser and the pump light;
the optical switch is connected with the wavelength division multiplexer and is used for switching each path of DFB laser signals reflected from the measuring point;
the interferometer is connected with the optical switch and is used for converting the reflected wavelength signals into phase signals;
the photoelectric detector is connected with the interferometer and used for detecting the output signal of the interferometer and carrying out phase demodulation;
the data acquisition card is connected with the photoelectric detector and is used for inputting the signals processed by the photoelectric detector into a computer;
the phase demodulation program is arranged in the computer and is used for demodulating the phase signal, recovering the wavelength signal and finally realizing the measurement of the vibration signal.
Further, the wavelength of the pump light source is 980 nm.
Further, the wavelength of the backscattered laser light is 1550 nm.
Furthermore, the DFB laser is connected with the wavelength division multiplexer through a cantilever arm and an optical fiber.
Further, the number of the couplers is at least 1.
Further, the number of the wavelength division multiplexers is at least 1.
Furthermore, the wavelength division multiplexer adopts a CWDM type wavelength division multiplexer or a DWDM type wavelength division multiplexer.
Furthermore, the optical switch adopts a liquid crystal type optical switch, an electro-optical type optical switch, a thermo-optical type optical switch or an acousto-optical type optical switch.
Compared with the prior art, the invention has the following advantages:
(1) the system of the invention bonds the cantilever beam fixed with the DFB laser on the transformer, the vibration of the cantilever beam is caused when the transformer vibrates, the vibration of the cantilever beam is deformed to cause the change of the wavelength of the light emitted by the DFB laser, the change of the wavelength is converted into the change of the phase through the interferometer, and finally the wavelength information is demodulated through the phase demodulation system, so that the vibration signal is obtained, the electromagnetic interference is resisted, and the sensitivity is high.
(2) The system of the invention can avoid adding a group of interferometers and phase demodulation systems to each vibration channel due to the introduction of the optical switch, thereby greatly reducing the volume of the vibration monitoring system of the distributed transformer and lowering the system cost.
(3) The system can increase the measurement vibration points by adding the coupler, the wavelength division multiplexer and the DFB laser, thereby realizing the measurement of the vibration information of a plurality of vibration points.
(4) The interferometer in the system converts wavelength signals into phase signals, the photoelectric detector converts optical signals carrying phase information into electric signals, the electric signals are collected by the data acquisition card and input into the computer for phase demodulation, and finally transformer vibration information is obtained.
Drawings
FIG. 1 is an architectural diagram of the system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
Fig. 1 is an architecture diagram of a vibration monitoring system of a high-sensitivity distributed transformer according to the present invention, which includes: 980nm pump light, an isolator, a coupler, a wavelength division multiplexer, a DFB laser, an optical switch, an interferometer, a photoelectric detector, a data acquisition card and a phase demodulation system.
A high-sensitivity distributed transformer vibration monitoring system comprising:
980nm pump light is used for providing a DFB laser as a pump source;
an optical isolator: 980nm laser light for isolation of backscattering;
a coupler: the device is used for splitting the pump light to perform distributed measurement;
a wavelength division multiplexer: used for separating the backward scattered 1550nm laser light and 980nm pump light;
an optical switch: the DFB laser device is used for switching each path of DFB laser signals reflected from the measuring point;
an interferometer: for converting the reflected wavelength signal into a phase signal;
PD detector: the interferometer is used for detecting the output signal of the interferometer and carrying out phase demodulation;
a data acquisition card: inputting the signal of the PD detector into a computer;
phase demodulation procedure: and demodulating the phase signals, recovering the wavelength signals, and finally realizing the measurement of the vibration signals.
The principle of the DFB laser transformer-based vibration sensor in the system provided by the invention is as follows: the cantilever beam fixed with the DFB laser is bonded on the transformer, the vibration of the cantilever beam is caused when the transformer vibrates, the vibration of the cantilever beam deforms to cause the change of the wavelength of light emitted by the DFB laser, the change of the wavelength is converted into the change of the phase through the interferometer, and finally, the wavelength information is demodulated through the phase demodulation system to obtain a vibration signal.
Practical examples:
980nm pump light passes through the isolator, is divided into two paths behind the coupler, enters the DFB laser after passing through the wavelength division multiplexer, is bonded on the cantilever beam, and when the cantilever beam vibrates, the wavelength of the DFB laser changes, and the backscattered laser enters the optical switch after passing through the wavelength division multiplexer, and the optical switch has the function of selecting one path of light of the DFB laser to enter the interferometer. Due to the introduction of the optical switch, the situation that each vibration channel is added with a group of interferometers and phase demodulation systems can be avoided, the size of the distributed transformer vibration monitoring system is greatly reduced, and the system cost is reduced. The interferometer converts the wavelength signal into a phase signal, the photoelectric detector converts an optical signal carrying phase information into an electric signal, the electric signal is collected by a data acquisition card and input into a computer for phase demodulation, and finally transformer vibration information is obtained.
The vibration information of a plurality of vibration points can be measured by adding a coupler, a wavelength division multiplexer and a DFB laser and increasing measurement vibration points.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A high-sensitivity distributed transformer vibration monitoring system, the system comprising: pump light source, optoisolator, coupler, wavelength division multiplexer, DFB laser instrument, photoswitch, interferometer, photoelectric detector, data acquisition card and phase demodulation procedure, wherein:
the pumping light source is used as a light source of the DFB laser;
the optical isolator is connected with the pumping light source and is used for isolating the backscattered laser;
the coupler is connected with the optical isolator and is used for splitting the pump light to perform distributed measurement;
the wavelength division multiplexer is respectively connected with the coupler and the DFB laser and is used for splitting the backscattered laser and the pump light;
the optical switch is connected with the wavelength division multiplexer and is used for switching each path of DFB laser signals reflected from the measuring point;
the interferometer is connected with the optical switch and is used for converting the reflected wavelength signals into phase signals;
the photoelectric detector is connected with the interferometer and is used for checking an output signal of the interferometer;
the data acquisition card is connected with the photoelectric detector and is used for inputting the signals processed by the photoelectric detector into a computer;
the phase demodulation program is arranged in the computer and is used for demodulating the phase signal, recovering the wavelength signal and finally realizing the measurement of the vibration signal.
2. The vibration monitoring system of a high-sensitivity distributed transformer as claimed in claim 1, wherein the wavelength of the pump light source is 980 nm.
3. The vibration monitoring system for the high-sensitivity distributed transformer as claimed in claim 1, wherein the wavelength of the backscattered laser light is 1550 nm.
4. The vibration monitoring system for the high-sensitivity distributed transformer according to claim 1, wherein the DFB laser is connected with the wavelength division multiplexer through a cantilever arm and an optical fiber.
5. The vibration monitoring system of a high-sensitivity distributed transformer as claimed in claim 1, wherein the number of said couplers is at least 1.
6. The vibration monitoring system for the high-sensitivity distributed transformer of claim 1, wherein the number of the wavelength division multiplexers is at least 1.
7. The vibration monitoring system of a high-sensitivity distributed transformer as claimed in claim 1, wherein the wavelength division multiplexer is a CWDM type wavelength division multiplexer or a DWDM type wavelength division multiplexer.
8. The vibration monitoring system for the high-sensitivity distributed transformer according to claim 1, wherein the optical switch is a liquid crystal optical switch, an electro-optical switch, a thermo-optical switch or an acousto-optical switch.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114167322A (en) * | 2021-11-29 | 2022-03-11 | 华北电力大学 | Optical fiber magnetic field sensor inside transformer |
CN114167242A (en) * | 2021-12-08 | 2022-03-11 | 国网河南省电力公司南阳供电公司 | Cable partial discharge monitoring device based on optical fiber laser sensing technology |
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CN207487812U (en) * | 2017-12-11 | 2018-06-12 | 卓创五洲(武汉)光电科技有限公司 | A kind of highly sensitive hydrophone array array apparatus based on FBG |
CN110231085A (en) * | 2019-07-09 | 2019-09-13 | 卫欢 | Phase modulation-type optical time domain reflectometer |
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2019
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CN2578832Y (en) * | 2002-11-14 | 2003-10-08 | 钟少龙 | Temperature self-compensated differential optical fibre acceleration sensor probe |
CN1963417A (en) * | 2006-11-16 | 2007-05-16 | 国家纳米技术与工程研究院 | Apparatus for measuring libration by optical fibre and measuring method |
CN101261281A (en) * | 2007-03-07 | 2008-09-10 | 中国科学院半导体研究所 | Optical fibre acceleration sensor based on ultra- short cavity optical fibre laser |
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CN114167242A (en) * | 2021-12-08 | 2022-03-11 | 国网河南省电力公司南阳供电公司 | Cable partial discharge monitoring device based on optical fiber laser sensing technology |
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