CN102156212A - Method and device for measuring heavy current of magnetic coupled fiber grating - Google Patents
Method and device for measuring heavy current of magnetic coupled fiber grating Download PDFInfo
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- CN102156212A CN102156212A CN2011100003400A CN201110000340A CN102156212A CN 102156212 A CN102156212 A CN 102156212A CN 2011100003400 A CN2011100003400 A CN 2011100003400A CN 201110000340 A CN201110000340 A CN 201110000340A CN 102156212 A CN102156212 A CN 102156212A
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Abstract
The invention relates to a method and device for measuring heavy current of a magnetic coupled fiber grating. The device comprises a current access wire, magnetism collecting sheets, elastic elements, a fiber Bragg grating and an auxiliary positioning component, wherein the magnetism collecting sheets are mutually connected through the elastic elements; the fiber Bragg grating is arranged on the elastic elements; and the auxiliary positioning component is used for the positioning between the current access wire and the magnetism collecting sheets. When the heavy current enters into the current access wire, a magnetic field is formed around the wire to magnetize the magnetism collecting sheets; interaction forces generate among the magnetism collecting sheets as well as between the magnetism collecting sheets and the wire so that elastic deformation of the elastic elements connected with the magnetism collecting sheets is aroused and then the centre wavelength of the fiber Bragg grating arranged on the elastic elements is moved; and a signal is transmitted to a fiber grating demodulation instrument through a fiber to be demodulated; and therefore, the purpose of measuring the heavy current is achieved. The device has the advantages of small volume, light weight, simple structure, insulation in nature and no need for external power and is suitable for measuring and monitoring the heavy current.
Description
Technical field:
The invention belongs to the fiber grating sensing technology field, relate to Fiber Bragg Grating (FBG:fiber Bragg grating) Super-Current Measurement method and device that a kind of magnetic field and couple of force close.
Background technology:
Power industry belongs to the basic activity of national economic development, and critical role is arranged in national economic development.Along with the fast development of economy, each country is all increasing day by day to the demand of electric power, causes that rated voltage and rated current grade improve year by year in the electric system.The electric current in the power industry and the measurement of voltage have important effect, and they provide information necessary such as being used for metering, control and relay protection in the electric system.
Traditional electromagnetic current transducer has played significant role in actual applications, but it still exists many defectives, as, insulation system complexity, bulky, cost is high; Safety coefficient is lower, has ferromagnetic resonance, hysteresis effect etc.Though constantly there is improvement project to propose, as take the active compensation two-stage current transformer based on Bang-Bang control, the current transformer of the inverted winding of use to eliminate the influence of leakage field to accuracy of measurement, and wait the precision that improves measurement, reduce measuring error etc., but do not change the inherent shortcoming of electromagnetic current transducer based on the zero-flux current transformer of automatic compensation.So a lot of scholars are in the design of being devoted to the optical voltage current transformer and exploitation.
The optical current mutual inductor of band Rogowski coil is to use early, develops also the most ripe a kind of optical current sensor.Be converted to the difference of voltage signal post processing mode according to the current signal of Rogowski coil output through integral element, the optical current mutual inductor of band Rogowski coil can be divided into: digital-to-analog conversion type, voltage-frequency conversion hysteria, analogue type etc.The AC signal because the Rogowski coil can only be coupled, therefore this current transformer is a kind of AC converter.This current transformer has been inherited Techniques in Electromagnetic Measurement maturation, characteristic of simple structure, has also merged advantages such as photoelectricity transmission fidelity superior performance, safety.In addition, Rogowski coil itself has that insulation system is simple, the iron-free magnetic saturation, measurement range is big and characteristics such as bandwidth.But itself can only measure exchange current the Rogowski coil, and needs power supply in addition, and often the optical current mutual inductor form with a kind of photoelectric mixed-mode occurs.
Magneto-optical current transformer (MOCT) is subjected to extensive concern always, and MOCT can be divided into two classes substantially by the different of sensing arrangement: the one, and full fiber type MOCT passes light and transducing part and adopts optical fiber; The 2nd, mixed type MOCT, light transmission adopts optical fiber, and sensing material many employings at present is block optical glass crystal magneto-optic memory technique.The subject matter that hinders at present the practicability of full optical fiber MOCT is that optical fiber exists birefringence and to the susceptibility of external environment factors such as vibration, wherein exists birefringence the most key with optical fiber.The course of work of mixed type closed type MOCT is the same with full optical fiber MOCT with principle, and different is that the sensor information that mixed type closed loop MOCT adopts is a magneto-optic glass, and polarized light is detour in magneto-optic glass one week of current carrying conductor or several weeks.This current transformer is simple in structure, highly sensitive.Mixed type ring concentrator formula MOCT also is based on the Faraday effect, does sensing material with block magneto-optic glass.But, because the stress birefrin problem that magneto-optic glass materials processing difficulty is big, frangible and the magneto-optic glass material causes because of temperature variation, it makes linearly polarized light become elliptically polarized light, and then produces unnecessary light intensity variation, and causes the practicability of error limitation magneto-optical current transformer.Along with applying of fiber grating, also become the focus of research based on the current sensor of fiber grating on a large scale.The following three kinds of methods of main application are carried out optical modulation.Magnetostrictive effect, heating effect of current, magnetic field cause the semi-girder stretching effect.Magnetostrictive effect is meant magnetostriction materials when being magnetized by external magnetic field, and its volume and length are with the phenomenon that changes.Though volume that magnetostrictive effect causes and length variations are small, the variation specific volume of its length changes much bigger, is the main object that people study application, is referred to as the line magnetostriction again.But the unstable characteristic of magnetostriction materials has limited its practicability.Heating effect of current is specially and directly plates one deck good conductor gold film on grating, and the thermal effect of utilizing current flow heats to produce makes fiber grating reflectance spectrum centre wavelength produce drift.But the temperature that electric current produces is subjected to the influence of ambient temperature easily, and temperature variation is the function of time, and the quick variation of electric current can not be reflected on the variation of temperature fast.Domestic surplusly have dragon etc. to utilize semi-girder to verify the possibility of fiber Bragg grating current sensing.Be embodied as and on the isosceles triangle semi-girder, stick fiber grating and the lead by electric current.Electrified wire is subjected to power in magnetic field effect makes semi-girder generation strain, strain is drifted about long generation of fiber grating cloth loudspeaker lattice wave, but because semi-girder is subjected to the interference of external disturbance easily, cause stability of structure relatively poor, restorative bad, and need in lead, switch in the measuring process, not realize passive measurement completely.The Chang Ruili of the Wuhan University of Technology principle of electromagnetic force, proposition is wound in single turn or two circle solenoid with the high-voltage great-current bus, produce attractive force, drive fiber grating and produce strain, and by measurement to optic fiber grating wavelength, realization is to the method for this Super-Current Measurement to be measured, and uses multiturn solenoid and little electric current to carry out the simulation Super-Current Measurement, but its experimental provision solenoid and be not suitable for the direct measurement of big electric current.
Summary of the invention:
The present invention is directed to above-mentioned the deficiencies in the prior art: the Fiber Bragg Grating Super-Current Measurement method and the device that provide a kind of magnetic field and couple of force to close.Apparatus structure of the present invention is simple, the essence insulation, and system stability is good, and antijamming capability is strong, and undesired signal is easy to handle by the subsequent software mode.
A kind of Bragg fiber grating (FBG) that closes based on magnetic field and couple of force that the present invention proposes is the measuring method and the device of electric current greatly, be based on the susceptibility of FBG counter stress/strain, FBG and flexible member and collection magnetic sheet combined form big current sense probe, by magnetomechanical effects, reach the purpose of Super-Current Measurement.
The technical solution adopted in the present invention is: a kind of magnetic force manifold type fiber grating heavy-current measuring device, and it comprises that electric current inserts lead, auxiliary positioning member, collects magnetic sheet, two above flexible members, two above Fiber Bragg Gratings, Transmission Fibers and fiber Bragg grating (FBG) demodulators more than two; Electric current inserts lead and locatees by the auxiliary positioning member with the collection magnetic sheet, the collection magnetic sheet is distributed on around the electric current access lead more than two, link to each other by flexible member between each collection magnetic sheet, a Fiber Bragg Grating is installed on the flexible member, and guaranteeing that chirp phenomenon does not take place two above Fiber Bragg Gratings, each Fiber Bragg Grating is connected to the fiber Bragg grating (FBG) demodulator device by Transmission Fibers.
In the technical scheme of the present invention, it is cylindric or lath-shaped that electric current inserts lead.
In the technical scheme of the present invention, flexible member and collection magnetic sheet are designed to insert lead and the required shape of actual measurement requirement with electric current.
In the technical scheme of the present invention, the collection magnetic sheet adopts paramagnetic material, and electric current inserts lead and adopts electric good conductor, and flexible member adopts the diamagnetism material, and the auxiliary positioning member adopts insulating material.
Magnetic force manifold type fiber grating heavy-current measuring device application process of the present invention: big electric current to be measured is inserted electric current insert lead, promptly around inserting lead, electric current will produce magnetic field, and magnetize all the collection magnetic sheets, the collection magnetic sheet each other, and between collection magnetic sheet and the electric current access lead, produce interaction force, cause flexible member generation deformation, and the Fiber Bragg Grating that is mounted is thereon surveyed, big current signal is converted to the Fiber Bragg Grating wave length shift, wavelength changes thereupon, by Transmission Fibers the variable quantity signal is sent to the measurement of fiber Bragg grating (FBG) demodulator restituted signal realization to big electric current again.
The collection magnetic sheet of magnetic force manifold type fiber grating heavy-current measuring device of the present invention plays the effect of collection magnetic, the collection magnetic sheet is connected with flexible member, Fiber Bragg Grating is fixed on the flexible member, and auxiliary location structure is used for the location between electric current access lead and the collection magnetic sheet.Fiber grating inserts restituted signal in the demodulation instrument by Transmission Fibers.
Heavy-current measuring device based on Bragg fiber grating of the present invention, when big electric current enters electric current access lead, can around lead, form magnetic field, after magnetic field will collect the magnetic sheet magnetization, between the collection magnetic sheet, produce interactional attractive force between collection magnetic sheet and the lead, attractive force can make and collect the flexible member generation elastic deformation that magnetic sheet links to each other, causing being installed in the Fiber Bragg Grating that applies tension force on the every flexible member in advance is compressed, the centre wavelength of Fiber Bragg Grating is moved, and discerned, and then obtain measured big current value by the fiber Bragg grating (FBG) demodulator device.By the flexible member of design different sensitivity, can regulate measurement sensitivity, be used for the place of different current measuring ranges.
Advantage of the present invention: compare with traditional current measuring method, the present invention has simple in structure, is easy to realize essence insulation, no electromagnetic interference (EMI), good stability, the advantage that antijamming capability is strong.
Description of drawings:
Fig. 1 is the one-piece construction synoptic diagram of sensor and measuring system,
Fig. 2 is the sensor construction sectional view,
Fig. 3 is an embodiment of apparatus of the present invention,
Among the figure: 1 electric current inserts lead, 2 auxiliary positioning members, 3 collection magnetic sheets, 4 flexible members, 5 Fiber Bragg Gratings, 6 Transmission Fibers, 7 Fiber Bragg Grating (FBG) demodulators, 9 auxiliary positioning shells.
Embodiment:
A kind of Bragg fiber grating (FBG) that closes based on magnetic field and couple of force that the present invention proposes is the measuring method and the device of electric current greatly.As shown in Figure 1 and Figure 2, the heavy-current measuring device based on Bragg fiber grating comprises that electric current inserts lead 1, auxiliary positioning member 2, collection magnetic sheet 3, flexible member 4, Fiber Bragg Grating 5, Transmission Fibers 6, Fiber Bragg Grating (FBG) demodulator 7.Principle of work of the present invention: measurement mechanism collection magnetic sheet 3 links to each other as sensing probe by flexible member 4.Electric current inserts lead 1 by location between auxiliary positioning member 2 and the collection magnetic sheet 3, and magnetic sheet is distributed on electric current and inserts around the lead, and Fiber Bragg Grating 5 is installed on the flexible member 4.When big electric current enters electric current access lead 1, around lead, produce magnetic field, collection magnetic sheet 3 is by after the magnetic field magnetisation, produce interaction force between the collection magnetic sheet 3 and between collection magnetic sheet 3 and the lead 1, this acting force makes flexible member 4 produce elastic deformation, make the Fiber Bragg Grating 5 that is installed on the flexible member 4 that corresponding deformation take place, its cloth loudspeaker lattice wave personal attendant changes, by Transmission Fibers 6 the variable quantity signal is sent to fiber Bragg grating (FBG) demodulator 7 again, fiber Bragg grating (FBG) demodulator 7 changes into electric signal with light signal, can reach the purpose that characterizes big electric current.
The collection magnetic sheet 3 of magnetic force manifold type fiber grating heavy-current measuring device of the present invention adopts paramagnetic material, flexible member 4 adopts the diamagnetism material, auxiliary positioning member 2 adopts insulating material, collection magnetic sheet 3 plays the effect of magnetic field converting to force, paramagnetic material can be magnetized rapidly, demagnetization rapidly again after magnetic field disappears, no hysteresis effect or hysteresis effect are very little.4 of flexible members adopt the diamagnetism material, avoid because by magnetic field magnetisation measurement is exerted an influence.2 of auxiliary positioning members adopt insulating material, and preventing influences sensor measurement with current field generation effect.After electric current produced magnetic field, collection magnetic sheet 3 will be rapidly by magnetic field magnetisation, caused collecting producing between magnetic sheet 3 and collection magnetic sheet 3 and collection magnetic sheet 3 and the electric current access lead 1 attracting each other, and drove flexible member 4 then and produced strain.
Collection magnetic sheet 3 can be according to the shape and the sensitivity of lead 1, and the needs of measurement range, adopts different quantity and be designed to different shapes.
Electric current inserts lead 1 and collection magnetic sheet 3 positions by auxiliary positioning member 2, guarantees flexible member 4 stability under loading, avoids because the vibrations that uneven installation causes.Bragg fiber grating 5 is installed on the flexible member 4.Installation should be avoided the phenomenon that occurs warbling, otherwise influences the collection of signal.
Below by the present invention of embodiment more detailed description, but be not limited to embodiment.
One that invents as shown in Figure 3 is embodiment for this reason, heavy-current measuring device based on Bragg fiber grating comprises that electric current inserts lead 1, auxiliary positioning member (shell) 2, flexible member 4, Fiber Bragg Grating 5, collection magnetic sheet 3, and several parts such as Transmission Fibers 6 are formed.Electric current inserts lead 1 by location between auxiliary positioning shell 2 and the collection magnetic sheet 3, and Fiber Bragg Grating 5 is installed on each flexible member 4, and guarantees that chirp phenomenon does not take place Fiber Bragg Grating 5.Collection magnetic sheet 3 adopts paramagnetic material, and flexible member 4 adopts the diamagnetism material, and auxiliary location structure 2 adopts insulating material, and 4 of flexible members adopt the diamagnetism material, and 2 on auxiliary positioning shell adopts insulating material.After electric current produces magnetic field, collection magnetic sheet 3 will be rapidly by magnetic field magnetisation, cause collecting magnetic sheet 3 and collection magnetic sheet 3 and collection magnetic sheet 3 and electric current and insert to produce between the lead 1 and attract each other, drive flexible member 4 generation strains then, and detected by Fiber Bragg Grating 5.
Its using method is as follows: big electric current to be measured is inserted in the lead 1, then this lead encloses and produces magnetic field, magnetic field will collect magnetic sheet 3 magnetization, cause collecting between the magnetic sheet 3 and between collection magnetic sheet 3 and the lead and produce interaction force, make and collect the flexible member 4 that magnetic sheet 3 links to each other deformation take place, the Fiber Bragg Grating that applies tension force in advance 5 that is installed in simultaneously on the flexible member 4 is compressed, then the cloth loudspeaker lattice wave length of Bragg fiber grating 5 changes, at last, the process fiber Bragg grating (FBG) demodulator can obtain the variable quantity of the optical wavelength directly related with the survey electric current, realizes the measurement to big size of current.
In the use, sensor is installed steadily, be avoided introducing external vibration and disturb, transducing signal is impacted.
Claims (5)
1. magnetic force manifold type fiber grating heavy-current measuring device is characterized in that: it comprises that an electric current inserts lead (1), an auxiliary positioning member (2), collects magnetic sheet (3), two above flexible members (4), two above Fiber Bragg Gratings (5), Transmission Fibers (6) and fiber Bragg grating (FBG) demodulator (7) more than two; Electric current inserts lead (1) and locatees by auxiliary positioning member (2) with collection magnetic sheet (3), collect magnetic sheet (3) more than two and be distributed on electric current access lead (1) all around, link to each other by flexible member (4) between each collection magnetic sheet (3), a Fiber Bragg Grating (5) is installed on the flexible member (4), and guaranteeing that chirp phenomenon does not take place two above Fiber Bragg Gratings (5), each Fiber Bragg Grating (5) is connected to fiber Bragg grating (FBG) demodulator device (7) by Transmission Fibers (6).
2. magnetic force manifold type fiber grating heavy-current measuring device according to claim 1 is characterized in that: it is cylindric or lath-shaped that electric current inserts lead (1).
3. magnetic force manifold type fiber grating heavy-current measuring device according to claim 1 is characterized in that: flexible member (4) and collection magnetic sheet (3) are designed to insert lead (1) with electric current and actual measurement requires required shape.
4. magnetic force manifold type fiber grating heavy-current measuring device according to claim 1, it is characterized in that: collection magnetic sheet (3) adopts paramagnetic material, electric current inserts lead (1) and adopts electric good conductor, and flexible member (4) adopts the diamagnetism material, and auxiliary positioning member (2) adopts insulating material.
5. the described magnetic force manifold type of claim 1 fiber grating heavy-current measuring device application process, it is characterized in that: big electric current to be measured is inserted electric current insert lead (1), promptly around inserting lead, electric current will produce magnetic field, and magnetize all the collection magnetic sheets (3), collection magnetic sheet (3) each other, and between collection magnetic sheet (3) and the electric current access lead (1), produce interaction force, cause that deformation takes place flexible member (4), and the Fiber Bragg Grating (5) that is mounted is thereon surveyed, big current signal is converted to Fiber Bragg Grating (5) wave length shift, wavelength changes thereupon, by Transmission Fibers (6) the variable quantity signal is reached fiber Bragg grating (FBG) demodulator (7) restituted signal again, realize measurement big electric current.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818920A (en) * | 2012-05-29 | 2012-12-12 | 武汉理工大学 | Current measuring method and device based on electromagnetic force and through optical fibers |
| CN105486904A (en) * | 2015-11-20 | 2016-04-13 | 哈尔滨工业大学 | Dichotomous optical current sensor |
| CN110187217A (en) * | 2018-11-30 | 2019-08-30 | 中航光电科技股份有限公司 | Connector for current online detection and active end thereof |
| CN110940932A (en) * | 2019-11-15 | 2020-03-31 | 国网山西省电力公司大同供电公司 | Cable sheath grounding current detection device based on fiber bragg grating and line elastic body |
| WO2023023834A1 (en) * | 2021-08-27 | 2023-03-02 | Companhia Paulista De Força E Luz - Cpfl | Arrangement in passive adapter device for current sensor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993015410A1 (en) * | 1992-01-29 | 1993-08-05 | Instrument Transformers Limited | Electric current measurement |
| CN2646717Y (en) * | 2003-08-01 | 2004-10-06 | 中国科学院半导体研究所 | Magnetostriction type optical fiber raster current sensor |
| CN2646718Y (en) * | 2003-08-01 | 2004-10-06 | 中国科学院半导体研究所 | Magnetostriction type optical fiber raster current sensor |
| CN101701978A (en) * | 2009-11-13 | 2010-05-05 | 曾碚勇 | Current detecting device on high-voltage and ultrahigh-voltage power transmission line and detecting method thereof |
-
2011
- 2011-01-04 CN CN 201110000340 patent/CN102156212B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993015410A1 (en) * | 1992-01-29 | 1993-08-05 | Instrument Transformers Limited | Electric current measurement |
| CN2646717Y (en) * | 2003-08-01 | 2004-10-06 | 中国科学院半导体研究所 | Magnetostriction type optical fiber raster current sensor |
| CN2646718Y (en) * | 2003-08-01 | 2004-10-06 | 中国科学院半导体研究所 | Magnetostriction type optical fiber raster current sensor |
| CN101701978A (en) * | 2009-11-13 | 2010-05-05 | 曾碚勇 | Current detecting device on high-voltage and ultrahigh-voltage power transmission line and detecting method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 孙作彬 等: "一种光纤光栅磁场传感器设计与实验", 《武汉理工大学学报》 * |
| 李宝树 等: "基于磁致伸缩效应的FBG电流传感器", 《电工技术学报》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818920A (en) * | 2012-05-29 | 2012-12-12 | 武汉理工大学 | Current measuring method and device based on electromagnetic force and through optical fibers |
| CN105486904A (en) * | 2015-11-20 | 2016-04-13 | 哈尔滨工业大学 | Dichotomous optical current sensor |
| CN105486904B (en) * | 2015-11-20 | 2018-03-13 | 哈尔滨工业大学 | Dichotomic type optical current sensor |
| CN110187217A (en) * | 2018-11-30 | 2019-08-30 | 中航光电科技股份有限公司 | Connector for current online detection and active end thereof |
| CN110187217B (en) * | 2018-11-30 | 2022-05-13 | 中航光电科技股份有限公司 | Connector for current online detection and active end thereof |
| CN110940932A (en) * | 2019-11-15 | 2020-03-31 | 国网山西省电力公司大同供电公司 | Cable sheath grounding current detection device based on fiber bragg grating and line elastic body |
| CN110940932B (en) * | 2019-11-15 | 2022-06-14 | 国网山西省电力公司大同供电公司 | Cable sheath grounding current detection device based on fiber bragg grating and line elastic body |
| WO2023023834A1 (en) * | 2021-08-27 | 2023-03-02 | Companhia Paulista De Força E Luz - Cpfl | Arrangement in passive adapter device for current sensor |
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Effective date of registration: 20181112 Address after: 238300 Wuwei County, Wuhu City, Anhui Province, east of Chaowu Wulu Road (24 buildings) Patentee after: ANHUI LONGLIAN INTELLIGENT PHOTOELECTRIC CO.,LTD. Address before: 430070 Hubei Province, Wuhan city Hongshan District Luoshi Road No. 122 Co-patentee before: Wang Lixin Patentee before: Wuhan Institute of Technology Industry Group Co.,Ltd. Effective date of registration: 20181112 Address after: 430070 Hubei Province, Wuhan city Hongshan District Luoshi Road No. 122 Co-patentee after: Wang Lixin Patentee after: Wuhan Institute of Technology Industry Group Co.,Ltd. Address before: 430070 Hubei Province, Wuhan city Hongshan District Luoshi Road No. 122 Patentee before: Wuhan University of Technology |
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