[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

CN111121945A - High-sensitivity distributed transformer vibration monitoring system - Google Patents

High-sensitivity distributed transformer vibration monitoring system Download PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
monitoring system
vibration monitoring
wavelength division
optical switch
division multiplexer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911191465.9A
Other languages
Chinese (zh)
Inventor
赵文彬
卞正兰
李晓华
张桂林
初凤红
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan Fabp Photoelectric Information Engineering Co ltd
Shanghai University of Electric Power
Original Assignee
Wuhan Fabp Photoelectric Information Engineering Co ltd
Shanghai University of Electric Power
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuhan Fabp Photoelectric Information Engineering Co ltd, Shanghai University of Electric Power filed Critical Wuhan Fabp Photoelectric Information Engineering Co ltd
Priority to CN201911191465.9A priority Critical patent/CN111121945A/en
Publication of CN111121945A publication Critical patent/CN111121945A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01HMEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H9/00Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means

Landscapes

  • Physics & Mathematics (AREA)
  • 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

High-sensitivity distributed transformer vibration monitoring system
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.
CN201911191465.9A 2019-11-28 2019-11-28 High-sensitivity distributed transformer vibration monitoring system Pending CN111121945A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911191465.9A CN111121945A (en) 2019-11-28 2019-11-28 High-sensitivity distributed transformer vibration monitoring system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911191465.9A CN111121945A (en) 2019-11-28 2019-11-28 High-sensitivity distributed transformer vibration monitoring system

Publications (1)

Publication Number Publication Date
CN111121945A true CN111121945A (en) 2020-05-08

Family

ID=70497002

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911191465.9A Pending CN111121945A (en) 2019-11-28 2019-11-28 High-sensitivity distributed transformer vibration monitoring system

Country Status (1)

Country Link
CN (1) CN111121945A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
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

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN101059433A (en) * 2007-06-05 2007-10-24 天津大学 Quasi-distribution type hybrid gas sensing system based on internal chamber optical fiber laser
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
CN103208161A (en) * 2013-03-19 2013-07-17 石家庄供电公司 Active detecting type fiber grating cable tunnel security and protection monitoring system
CN103954307A (en) * 2014-04-29 2014-07-30 中国人民解放军海军工程大学 Optical fiber laser sensor time division and wavelength division combined multiplexing method
CN107782437A (en) * 2017-08-24 2018-03-09 上海华魏科技股份有限公司 Distributed optical fiber vibration sensing system with decay real time monitoring function
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

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN101059433A (en) * 2007-06-05 2007-10-24 天津大学 Quasi-distribution type hybrid gas sensing system based on internal chamber optical fiber laser
CN103208161A (en) * 2013-03-19 2013-07-17 石家庄供电公司 Active detecting type fiber grating cable tunnel security and protection monitoring system
CN103954307A (en) * 2014-04-29 2014-07-30 中国人民解放军海军工程大学 Optical fiber laser sensor time division and wavelength division combined multiplexing method
CN107782437A (en) * 2017-08-24 2018-03-09 上海华魏科技股份有限公司 Distributed optical fiber vibration sensing system with decay real time monitoring function
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

Cited By (2)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
CN106768278B (en) Distributed optical fiber vibration and temperature dual-physical quantity sensing and positioning system
CN102425995B (en) Optical fiber sensor system for measuring static/dynamic strain and temperatures simultaneously and method for optical fiber sensor system
Perez-Herrera et al. Fiber optic sensor networks
CN103542925B (en) Quasi-distributed optical vibrating sensing device
CN105136178B (en) The distribution type optical fiber sensing equipment and method of the relevant domain analysis of chaos Brillouin light
US20180292240A1 (en) Distributed optical fiber disturbance positioning system based on the asymmetric dual mach-zehnder interference, and positioning method thereof
CN102313568B (en) The distribution type optical fiber sensing equipment that a kind of Brillouin and Raman detect simultaneously
CN105136177B (en) The distribution type optical fiber sensing equipment and method of a kind of submillimeter spatial resolution
CN201876348U (en) Tunable optical time domain reflectometer
CN105721048B (en) Compound optical fiber communication line fault monitoring method and system
CN102148643A (en) Device for detecting wave-division multiplexing passive optical network failure and detection method thereof
CN110220470A (en) Single-ended chaos Brillouin dynamic strain measurement device and method based on Rayleigh scattering
CN104964699A (en) Disturbance determining method and apparatus based on phi-OTDR fiber distributed type disturbance sensor
CN109163829A (en) The dynamic distributed fibre optical sensor of high-performance based on Brillouin and Rayleigh double-unit system
CN103591971A (en) Positioning method and system of fiber grating
CN105699294A (en) Micro-nano optical sensor system capable of achieving concentration measurement of various gases
CN104296783A (en) Sensor detecting method and device for enhanced coherent optical time domain reflection
CN111121945A (en) High-sensitivity distributed transformer vibration monitoring system
CN112162229A (en) State monitoring device for optical fiber current sensor
CN105471510A (en) Fiber grating sensing and fiber communication integrated system
CN110806259A (en) Device for high-frequency disturbance positioning and detection of optical fiber sensing
CN207036297U (en) A kind of optical fiber grating temperature-measuring system
CN109031048B (en) Fault positioning system and method based on fiber bragg grating current sensor
CN102735272B (en) Barrier-searchable Brillouin optical time domain analyzer
CN102646308A (en) Perimeter security system based on single optical fiber and fiber bragg grating of single optical fiber

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20200508