CN103925984B - Optical fibre vibration sensor and the transmission line of electricity aeolian vibration monitoring system for applying it - Google Patents
Optical fibre vibration sensor and the transmission line of electricity aeolian vibration monitoring system for applying it Download PDFInfo
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- CN103925984B CN103925984B CN201310542441.XA CN201310542441A CN103925984B CN 103925984 B CN103925984 B CN 103925984B CN 201310542441 A CN201310542441 A CN 201310542441A CN 103925984 B CN103925984 B CN 103925984B
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Abstract
The present invention relates to the transmission line of electricity aeolian vibration monitoring systems of a kind of optical fibre vibration sensor and the application sensor, and the optical fibre vibration sensor includes sequentially connected fixed body, the beam of uniform strength and the contact being arranged on the conducting wire；The fixed body passes through the fixture being arranged on the conducting wire and connect with the conducting wire, is symmetrically arranged with fiber bragg grating perpendicular to the upper and lower surface of the beam of uniform strength axis；The sensor is installed as upright method of hull section construction, and installation point is the tired dangerous point of grounded-line.The monitoring system includes sequentially connected optical fibre vibration sensor, optical fiber composite overhead ground wire, wavelength apparatus for regulating and host.The sensor and monitoring system have the characteristics that measurement accuracy is high, speed is fast, frequency response is good, long-term behaviour is stable, overcome original technology and influenced vulnerable to complex electromagnetic environment, measurement accuracy and poor sensitivity, volume be big, system stability is poor and can not real-time delivery field data the problems such as, improve the stability and reliability of the system.
Description
Technical field:
The present invention relates to on-line monitoring technique field, it is more particularly to a kind of optical fibre vibration sensor and applies the sensor
Transmission line of electricity aeolian vibration monitor system.
Background technique:
Transmission line wire aeolian vibration is since the incentive action of wind causes conducting wire that resonance, shape occur in vertical plane
It is moved back and forth at regular wave up and down.The wind speed range vibrated is generally 0.5~10m/s, and vibration frequency is generally 3
~150Hz, maximum double-amplitude are generally no greater than 1~2 times of diameter of wire, generally a few hours, are a couple of days, high frequency sometimes
Aeolian vibration a little is most frequent, and conducting wire is made to generate different degrees of dynamic bending stress, be easy to cause stranded conducting wire fatigue, fitting,
Fatigue damage or abrasion of conductor spacer and shaft tower component etc. seriously affect the safety of transmission line of electricity especially UHV transmission line
Operation.
The case where in order to evaluate conducting wire aeolian vibration, generallys use the survey of relative amplitude as defined in ieee standard both at home and abroad at present
Amount method measures the aeolian vibration extent of injury.Measure the bending amplitude at distance of wire and wire clamp burble point 89mm.The country surveys
The on-Line Monitor Device of amount conducting wire aeolian vibration generallys use upright method of hull section construction and upside-down method of hull-section construction measures, and the sensor for measuring vibration has
It is several below: cantilever beam resistance strain type sensor, laser sensor and acceleration transducer.
Cantilever beam resistance strain type sensor is current using a kind of most sensors, and advantage is that structure is simple, but electricity
Resistance strain gauge transducer is easy affected by environment, and that there are bridge balances is difficult, nonlinearity erron is big and vulnerable to electromagnetic interference and not
The problems such as capable of running steadily in the long term, have a significant impact to measurement result and stability；In addition, resistance strain type sensor needs electricity
Source power supply, causes measuring device volume excessive, and the cantilever beam resistance strain type sensor of upside-down installation method measures conductor vibration
Cause certain error.
Laser sensor is non-contact measurement, and advantage is that anti-electromagnetic interference capability is strong, but there are measurement accuracy it is slightly poor and
The disadvantages of power consumption is larger is unfavorable for the measurement of power line conductive linearly coupled very much.
Acceleration transducer measures the amplitude of vibration by the acceleration of measurement vibration, and advantage is that sensor bulk is small,
But the amplitude of measurement is absolute amplitude, is not relative amplitude as defined in ieee standard, and absolute amplitude mensuration measures aeolian vibration
The extent of injury is also not widely approved at present.
The above existing sensor measurement needs wirelessly to pass to monitoring center, since wireless communication is believed
It is number unstable, cause vibration measurement result that can not transmit.
Field power supply is needed, vulnerable to complex electromagnetic environment for vibrating sensor existing for above-mentioned existing overhead transmission line
Influence, measurement accuracy and poor sensitivity, volume be big, system stability is poor and can not real-time delivery field data, the problems such as, propose
The present patent application.
Summary of the invention:
The object of the present invention is to provide the transmission line of electricity aeolian vibrations of a kind of optical fibre vibration sensor and the application sensor
Monitoring system, the sensor system are suitable for various weather measurements, and electromagnetism interference is conducive to long term monitoring, simplifies simultaneously
System structure is monitored, the stability and reliability of system are improved.
To achieve the above object, the invention adopts the following technical scheme: a kind of optical fibre vibration sensor, the fiber-optic vibration
Sensor includes sequentially connected fixed body, the beam of uniform strength and the contact being arranged on the conducting wire；The fixed body passes through
The fixture being arranged on the conducting wire is connect with the conducting wire, perpendicular to symmetrical on the axis of the beam of uniform strength upper and lower surface
Equipped with fiber bragg grating.
A kind of optical fibre vibration sensor provided by the invention, the fixed body is equipped with fiber bench, by the optical fiber Bragg
Its optical fiber tail-end of grating passes sequentially through the fiber bench and optical fiber connector.
Another preferred a kind of optical fibre vibration sensor provided by the invention, the fixed body is its radial direction equipped with recessed
The cylindrical body of slot, below the fiber bench, its bottom edge is arranged in the groove the beam of uniform strength groove.
Another preferred a kind of optical fibre vibration sensor provided by the invention, the beam of uniform strength is cantilever beam type elastomer
Isoceles triangle plate, material are beryllium-bronze；The beam of uniform strength with a thickness of 1-1.5mm, width 10-20mm, hang length
For 89mm.
Another preferred a kind of optical fibre vibration sensor provided by the invention, the fixture by bolt respectively with it is described solid
Determine body and conducting wire vertically connects, the fixture is to be made of two semicircle beckets, has electro-insulating rubber inside the becket.
Another preferred a kind of optical fibre vibration sensor provided by the invention, the contact are the setting of radially direction
Cylindrical body on the conducting wire, material are aluminium alloy, and the contact diameter is 3cm, with a thickness of 1cm.
Another preferred a kind of optical fibre vibration sensor provided by the invention, the optical fiber cloth of the beam of uniform strength upper and lower surface
Glug grating is that strain fiber bragg grating or temperature compensation fiber bragg grating, the bragg wavelength of upper and lower two gratings are poor
0.1 nanometer.
Another preferred a kind of optical fibre vibration sensor provided by the invention, the fiber bragg grating and equal strength fine strain of millet
It is fixedly connected using method for laser welding, the foil gauge or temperature-compensating plate of the fiber bragg grating is made by seamless welding
It is tightly fixed on equal strength fine strain of millet.
Another preferred a kind of optical fibre vibration sensor provided by the invention, the beam of uniform strength with a thickness of 1 or 1.5mm,
Width is 15mm, and suspension length is 89mm.
A kind of transmission line of electricity aeolian vibration provided by the invention monitors system, and the monitoring system includes on sequentially connected
State optical fibre vibration sensor, optical fiber composite overhead ground wire, wavelength apparatus for regulating and the host of any one of content technical solution.
By adopting the above-described technical solution, the beneficial effect that the present invention obtains is:
1, the present invention in fiber-optic grating sensor due to using fiber bragg grating to optical signal carry out reflection measurement,
Measure field is passive measurement mode, is suitable for various weather measurements, and electromagnetism interference is conducive to long term monitoring；It overcomes existing
On-line monitoring method in technology is onsite active measurement, needs to be provided about power supply in measurement point, active measurement be easy by
Weather environment, electromagnetic environment and capacitance of storage etc. influence.
2, the application of the sensor in the present invention is so that the system uses a set of demodulating system using distributed measurement technology
Multiple aeolian vibration regions are carried out while being monitored, system cost is greatly reduced；
3, conductor vibration is measured using fiber bragg grating in the present invention, the wavelength interrogation technique of use, with
Situations such as light signal strength is unrelated, the waving of transmission fiber, connector variation will not impact measurement, and improve system can
By property and stability；
4, system of the invention is in dynamic measurement, and the measuring precision is high, speed is fast, frequency response is good, chronicity
It can stablize；
Detailed description of the invention
Fig. 1 is the structural schematic diagram of optical fibre vibration sensor of the present invention；
Fig. 2 is present invention monitoring system schematic；
Wherein, the 1- beam of uniform strength, 2- fixed body, 3- contact, 4- fiber bench, 5- fixture, 6- conducting wire, 7- optical fiber Bragg
Grating.
Specific embodiment
Below with reference to embodiment, the invention will be described in further detail.
Embodiment 1:
As shown in Figs. 1-2, the optical fibre vibration sensor that the invention of this example is stated includes the sequentially connected beam of uniform strength 1 and fixes
Body 2, the beam of uniform strength 1 and the contact 3 being arranged on the conducting wire；The fixed body 2 passes through the card being arranged on the conducting wire 6
Tool 5 connect with the conducting wire 6, in 1 upper and lower surface of the beam of uniform strength perpendicular to respectively symmetrically pasting one on its central axes
Fiber bragg grating 7.
The fixed body 2 is equipped with fiber bench 4, and described its optical fiber tail-end of fiber bragg grating 7 is passed sequentially through the light
Fine seat 4 and optical fiber connector.
The beam of uniform strength 1 is cantilever beam type elastomer isoceles triangle plate, and material is preferably beryllium-bronze, which has
The advantages that yield strength is big, and elastic deformation range is big, and elastic hysteresis is small, wear-resisting, low temperature resistant, corrosion-resistant, the Young of this material
Modulus is 128GPa, yield strength 1000Ma, tensile strength 1250Ma, and corresponding elastic strain range is 7812.5 micro- to answer
Become, is greater than optical fibre Bragg optical grating strain range.Excessively thin beryllium-bronze be easy to cause contact and conducting wire to disengage, and excessively thin
Narrow beryllium-bronze can also deform in the case where not stressing, and blocked up beryllium-bronze will reduce transducer sensitivity, because
The Thickness ness of beryllium-bronze is 1-1.5mm in this present embodiment, and width 10-20mm, suspension length is 89mm；In the present embodiment
The beryllium-bronze with a thickness of 1mm, width 20mm, hang length be 89mm or the beryllium-bronze with a thickness of 1.5mm, width
For 10mm, hang length be 89mm or the beryllium-bronze with a thickness of 1.25mm, width 15mm, suspension length is 89mm.Institute
Stating fixed body 2 is that its radial direction sets reeded cylindrical body, and fixed body 2 is divide into upper part and lower part by the groove, the institute
Groove is stated below the fiber bench 4, root bottom edge is arranged in the groove the beam of uniform strength 1, the beam of uniform strength 1
Top is fixedly connected by welding and contact 3；The fixture 5 is hung down with the fixed body 2 and conducting wire 6 respectively by bolt
Direct-connected to connect, the fixture 5 is the ring structure being made of two semicircle beckets, has electro-insulating rubber inside the becket.
The bragg wavelength of the bare fibre Bragg grating be accurate to 0.1 nanometer hereinafter, by same wave band FBG into
Traveling wave length is selected, and the initial bragg wavelength difference of two fiber bragg grating 7(FBG) is controlled within 0.1 nanometer.
The bragg wavelength of the bare fibre Bragg grating be accurate to 0.1 nanometer hereinafter, by same wave band FBG into
Traveling wave length is selected, and the initial bragg wavelength difference of two fiber bragg gratings (FBG) is controlled within 0.1 nanometer.
The fiber bragg grating 7 is fixedly connected with equal strength fine strain of millet 1 using method for laser welding, is made by seamless welding
Optical fibre Bragg optical grating strain piece or temperature-compensating plate are tightly fixed on equal strength fine strain of millet 1.Two fiber bragg gratings 7
It is separately mounted to the upper and lower surface of the beam of uniform strength 1, the upper and lower surface installation is strain fiber bragg grating or temperature compensation light
The bragg wavelength difference of fine Bragg grating, upper and lower two gratings is accurate to 0.1 nanometer.
The contact 3 is that radially the cylindrical body wheeled construction on the conducting wire 6 is arranged in direction, and material is aluminium
Alloy, the contact diameter is 3cm, with a thickness of 1cm, it can be achieved that point contact with conducting wire 6 and the beam of uniform strength 1.
The transmission line of electricity aeolian vibration of this example invention monitors system, the system comprises optical fibre vibration sensor, the prison
Examining system includes that the sequentially connected optical fibre vibration sensor being arranged on conducting wire 6, the optical fiber being arranged on electric power pylon are compound
Aerial earth wire, wavelength apparatus for regulating and host.
Situations such as frequency and amplitude of the optical fibre vibration sensor measure traverse line aeolian vibration, the fixed body 2 are equipped with
Described its optical fiber tail-end of fiber bragg grating 7 is passed sequentially through the fiber bench 4 and optical fiber connector is connected to by fiber bench 4
In optical fiber composite overhead ground wire (OPGW, OpticalFiberCompositeOverhead GroundWire).The optical fiber is multiple
It closes aerial earth wire OPGW to connect optical fibre vibration sensor with the optical fibre interrogation device in substation, by data transfer to change
In power station, the Wavelength demodulation device installed in substation demodulates the reflection kernel wavelength of fiber bragg grating, so
The central wavelength value demodulated is sent to host afterwards.
When conducting wire 6 vibrates, the vibration in 6 direction of vertical wires will lead to the beam of uniform strength 1 occur along its length it is curved
Song, the beam of uniform strength 1 is realized by contact and 6 synchronous vibration of conducting wire, since contact 3 is in contact condition with conducting wire 6 always,
The vibration amplitude that the optical fibre vibration sensor is measured is opposite width of 1 top of the beam of uniform strength with respect to the root bottom edge of beam
Value.Since the beam of uniform strength 1 is strain beam, the strain facies that any point generates at the upper and lower surface of beam is same, leads to optical fiber Bragg light
The reflection wavelength of grid changes, and by the demodulation to reflection wavelength, carries out corresponding signal processing, can obtain the phase of aeolian vibration
To amplitude and vibration frequency data.
After 1 stress of the beam of uniform strength generates deformation, the fiber bragg grating 7FBG1 of upper and lower surface stickup
(FiberBraggGrating) it is influenced by stretching strain, bragg wavelength (Bragggrating wavelength) λ 1 increases
Greatly, opposite lower surface fiber bragg grating 7FBG2 bragg wavelengths 2 reduce.Since 1 upper and lower surface of the beam of uniform strength strains
The size same direction is on the contrary, method gram by symmetrically pasting such bare fibre Bragg grating in 1 upper and lower surface of the beam of uniform strength
Having taken strain and Temperature cross-over influences problem.
Since measuring device and demodulated equipment are all electric measurement, it is highly prone in the strong-electromagnetic field region of transmission line of electricity
The influence of electromagnetic interference；Multiple optical fibre vibration sensors are separately mounted in different aeolian vibration monitoring regions, are used
These optical fibre vibration sensors are connected to a set of optical fiber grating regulating system in substation by OPGW, can thus be supervised in real time
The vibration state for surveying multiple optical fiber raster vibration sensors, calculates separately out the gentle breeze situation in different monitoring regions, and distribution is surveyed
Amount greatly reduces system cost.
The fiber grating monitoring system of the above embodiment of the present invention is suitable for various weather measurements, electromagnetism interference, benefit
In long term monitoring；In dynamic measurement, the measuring precision is high, speed is fast, frequency response is good, long-term behaviour is stable；Measurement
Obtained strain by Wavelength-encoding realize, optical fiber raster vibration measuring system not by the light-intensity variation of light source, optical fiber connection and
The influence of the factors such as the variation of coupling loss and optical polarization；Measurement sensitivity is good, high resolution；It is surveyed using distribution
Amount technology can be used a set of demodulating system and multiple aeolian vibration regions carried out while being monitored, greatly reduces system cost；
Optical fiber grating regulating system is stablized by substation's power-supply system function, power safety.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Pipe is described the invention in detail referring to above-described embodiment, it should be understood by those ordinary skilled in the art that: still may be used
With modifications or equivalent substitutions are made to specific embodiments of the invention, and repaired without departing from any of spirit and scope of the invention
Change or equivalent replacement, should all cover in present claims range.
Claims (2)
1. a kind of optical fibre vibration sensor, it is characterised in that: the optical fibre vibration sensor include sequentially connected fixed body, etc.
Intensity beam and the contact being arranged on conducting wire；The fixed body passes through the fixture being arranged on the conducting wire and the conducting wire connects
It connects, perpendicular to being symmetrically arranged with fiber bragg grating on the axis of the beam of uniform strength upper and lower surface；
The fixed body is that its radial direction sets reeded cylindrical body, and the groove is described to wait by force below the fiber bench
It spends beam its bottom edge is arranged in the groove；
The beam of uniform strength is cantilever beam type elastomer isoceles triangle plate, and material is beryllium-bronze；
The fixed body is equipped with fiber bench, and by the fiber bragg grating, its optical fiber tail-end passes sequentially through the fiber bench and light
Fiber connector；
The fixture is connect by the way that bolt is vertical with the fixed body and conducting wire respectively, and the fixture is by two semicircle beckets
Composition, the becket inside have electro-insulating rubber；
The contact is that radially the cylindrical body on the conducting wire is arranged in direction, and material is aluminium alloy, the contact
Body diameter is 3cm, with a thickness of 1cm；
The fiber bragg grating of the beam of uniform strength upper and lower surface is strain fiber bragg grating or temperature compensation optical fiber Bragg
Grating, poor 0.1 nanometer of the bragg wavelength of upper and lower two gratings；
The fiber bragg grating is fixedly connected with the beam of uniform strength using method for laser welding, makes the light by seamless welding
The foil gauge or temperature-compensating plate of fine Bragg grating are tightly fixed on the beam of uniform strength；
The beam of uniform strength is 89mm with a thickness of 1 or 1.5mm, width 15mm, suspension length.
2. a kind of transmission line of electricity aeolian vibration monitors system, it is characterised in that: the monitoring system includes sequentially connected right
It is required that optical fibre vibration sensor described in 1, optical fiber composite overhead ground wire, wavelength apparatus for regulating and host.
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| CN105222882B (en) * | 2015-09-22 | 2018-07-20 | 广东电网有限责任公司佛山供电局 | Transmission line of electricity aeolian vibration on-line monitoring system |
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| WO2020044660A1 (en) * | 2018-08-30 | 2020-03-05 | 日本電気株式会社 | State identification system, state identification device, state identification method, and non-transitory computer readable medium |
| CN109297662B (en) * | 2018-10-11 | 2024-04-12 | 三峡大学 | Vibration test device and test method for overhead cable |
| JP7211134B2 (en) * | 2019-02-12 | 2023-01-24 | 日本電信電話株式会社 | Aerial optical fiber cable inspection method, aerial optical fiber cable inspection device and program |
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