CN102299571A - Device for collecting magnetic field energy of electrical appliance power feeder and power feeder state monitoring system - Google Patents
Device for collecting magnetic field energy of electrical appliance power feeder and power feeder state monitoring system Download PDFInfo
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- CN102299571A CN102299571A CN2011101353492A CN201110135349A CN102299571A CN 102299571 A CN102299571 A CN 102299571A CN 2011101353492 A CN2011101353492 A CN 2011101353492A CN 201110135349 A CN201110135349 A CN 201110135349A CN 102299571 A CN102299571 A CN 102299571A
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Abstract
The invention discloses a device for collecting magnetic filed energy excited by electric current of a power feeder. The structure is that a magnetic field region excited by electric current in an electric wire and cable is provided with a plurality of energy transducers with a magneto-electricity conversion function, and the magnetic field action direction of the energy transducers is parallel with the magnetic field direction excited by electric current in the electric wire and cable at the positions of the energy transducers; and the size of each energy transducer along the perimeter direction of the electric wire and cable is less than one fourth of the cross section perimeter of the electric wire and cable. The invention also discloses a self-power-supply wireless sensor based on the structure above and a power feeder state monitoring system based on the self-power-supply wireless sensor. The device provided by the invention has the beneficial effects that the magnetic field energy excited by electric current in the electrical appliance power feeder (comprising a single-wire cable, a dual-wire cable and a three-wire cable) can be collected to acquire electric energy; and the collected energy is utilized to drive the self-power-supply wireless sensor to operate, and the power feeder state monitoring system is formed.
Description
Technical field
The present invention relates to a kind of magnetic field energy harvester, relate in particular to a kind of device and supply lines condition monitoring system of gathering electric power supply line magnetic field energy.
Background technology
It is a kind of basic physical phenomenon that electric current produces magnetic field, when flowing through alternating current in defeated/supply lines, can produce the alternating magnetic field around electric wire simultaneously.By electromagnetic induction, can convert alternating magnetic fields to electric current.That is to say does not need directly to insert electric wire, just can obtain electric energy.According to electromagnetic induction principle, the induced electromotive force that alternating magnetic field produces and the rate of change of the magnetic flux in the closing of polygon loop are directly proportional.For the alternating magnetic field of given frequency, also can be expressed as with the closed-loop path in magnetic flux be directly proportional.
Document [1] and [2] propose on single supply lines power pack to be installed, and can gather energy of electromagnetic field, for the detected electrons system of defeated/power supply itself provides power supply.([1] J. Ahola, T. Ahonen, V. Sarkimaki, A. Kosonen, et al., Design considerations for current transformer based energy harvesting for electronics attached to electric motor, Proc. Of International Symposium on Power Electronics, Electrical Drives, Automation and Motion, Page (s): 901 – 905,2008. [2] H. Zangl, T. Bretterklieber, G. Brasseur, Energy harvesting for online condition monitoring of high voltage overhead power lines, IEEE International Instrumentation and Measurement Technology Conference Victoria, Vancouver Island, Canada, 2008.) in this conversion process, supply lines is exactly the input (elementary) of converter, and the secondary of converter is exactly the output of electric energy.
The electric wire of powering for electrical equipment (as household electrical appliance, office electrical equipment or the like) is seen everywhere, and common situation is that the supply current of an electrical equipment is little, generally below 100 A.Single phase power supply is the supply power mode that conventional electrical appliance generally adopts.When single phase power supply, the power supply electric wire of employing normally is wrapped in phase line and two leads of the neutral line by insulating barrier, or also includes three leads of ground wire.The former is called the zip mode electric wire, and the latter is called triaxial cable.When single phase power supply, in a zip mode electric wire or a triaxial cable two antipodal electric current lines of direction are arranged, these two electric current lines are determined by the diameter and the cladding thickness of conductor wire in the distance of locus.Because two rightabout electric currents are arranged in an enclosed region, the magnetic field of generation no longer has identical direction of rotation, one comprise cable cross-section the zone in magnetic flux cancel out each other or basic neutralisation.Show as Fig. 1.If do not change the structure of electric wire like this, two-wire or triaxial cable directly as the magnetic field energy of the elementary collection electric wire of power pack, be can not get output basically.
The researcher of advanced industrial science of Japan and research institute of technology country proposes the plug place at the Alternating Current Power Supply line, the emittance of gathering electric wire with the method for electromagnetic induction is a monitoring electric wire operating state (temperature, electric current) wireless senser power supply (is seen document [3] Y. Zhang, J. Lu, H. Hiroshima, et al., Simulation and design of micro inductor for electromagnetic energy scavenging at low AC frequency in wireless sensor network, PowerMEMS 2009, Washington DC, USA, Page (s): 253-256,2009.).Because plug conductors is separated, the space length of electric current line increases several times in covering, in the little neighborhood scope of inserting first metallic tines, can regard the magnetic field that a separate current line forms as, and the magnetic flux of pitching around plug just is not cancelled.But this energy acquisition mode is used limited (can only be used in the plug place), and because the actual range between the plug fork is limited, the situation that still exists electromagnetic induction loop magnetic flux to be cancelled, the energy that actual acquisition arrives is far below theoretical value.
Summary of the invention
At the problem in the background technology, the present invention proposes a kind of device of gathering the magnetic field energy that line current excites, its structure is: the field region in the electric wire outside is provided with a plurality of transducers that possess the magnetoelectricity translation function, and the action of a magnetic field direction of transducer excites the direction in magnetic field parallel with the electric wire at place, transducer position; Transducer along the size of electric wire circumferential direction less than 1/4 of electric wire section girth.
A kind of concrete structure of transducer is: transducer is by the piezomagnetic material layer and piezoelectric material layer is alternately laminated forms, and the piezomagnetic material layer is identical with the piezoelectric material layer shape; The interface of material layer excites the direction in magnetic field parallel with the electric wire at place, transducer position, the action of a magnetic field direction of piezomagnetic material layer, it is exactly the action of a magnetic field direction of transducer, excite the direction in magnetic field parallel with the electric wire at transducer position place, and material layer along the size of electric wire circumferential direction less than 1/4 of electric wire section girth.
The another kind of structure of transducer is: transducer is made up of the coil that is the tubular coiling, the electric wire at central shaft and the transducer position place of tube excites the direction in magnetic field parallel, and tin along the size of electric wire circumferential direction less than 1/4 of electric wire section girth.
Be provided with the magnetic core of high magnetic permeability in the mesopore of the tube that coil surrounded.
The end face of high magnetic permeability magnetic core links to each other with the magnetic pole strength of permanent magnet, for magnetic core provides magnetic bias, to improve, to regulate the effective permeability of magnetic core.
The invention allows for a kind of self-energizing self-power wireless transducer of electric wire surrounding magnetic field energy implement device that utilizes, its structure is: it is made up of device, microprocessor and the transducer of communication module, collection supply lines magnetic field energy; Microprocessor is connected with communication module, sensor communication respectively; Communication module is connected with sensor communication; The device of gathering the supply lines magnetic field energy provides electric energy for microprocessor, communication module and transducer.
The invention allows for a kind of supply lines condition monitoring system based on aforementioned self-power wireless transducer, its structure is: it is made up of a plurality of self-power wireless transducers, cordless communication network and monitoring center; Each self-power wireless transducer communicates to connect by cordless communication network and monitoring center.
Useful technique effect of the present invention is: can gather the acquisition electric energy to the magnetic field energy that electric current in the electric power supply line (comprising single line, two-wire, triaxial cable) excites; The energy drives self-power wireless transducer running that utilization collects, and form the supply lines condition monitoring system.
Description of drawings
Fig. 1, paired cable surrounding magnetic field distribution schematic diagram;
The transducer architecture schematic diagram of Fig. 2, layer structure;
Fig. 3, transducer installation site schematic diagram;
Fig. 4, transducer array structural representation;
Fig. 5, self-power wireless sensor construction schematic diagram;
Fig. 6, supply lines condition monitoring system structural representation.
Embodiment
The collector that is used to gather the electric wire magnetic field energy of the prior art, collector need be arranged on plug fork place and just can gather, because the restriction of the physical dimension at plug fork place, collection effect is very bad, need transform the structure of multiple conductor cable commonly used, cause cost to increase.In order to overcome the problem that harvester is subjected to the physical dimension restriction, the present invention proposes a kind of device of gathering the supply lines magnetic field energy, the field region that excites because of electric current in electric wire 1 outside is provided with a plurality of transducers 2 that possess the magnetoelectricity translation function, and the action of a magnetic field direction of transducer 2 excites the direction in magnetic field parallel with the electric wire 1 at place, transducer 2 positions; Transducer 2 along the size of electric wire circumferential direction less than 1/4 of electric wire 1 section girth.
The present invention adopts the undersized transducer 2 that possesses the magnetoelectricity translation function, has broken the bottleneck that existing harvester need be subjected to the service cable structural limitations, allows transducer 2 all play a role in the arbitrary position in the peripheral magnetic field of electric wire 1; Its course of work is: because the magnetic action direction of transducer 2 excites the direction in magnetic field parallel with the electric wire 1 of these transducer 2 positions, transducer 2 is converted into electric energy with magnetic field energy under action of alternating magnetic field, realizes the collection of energy.
Magnetic field distance big or small and apart from electric wire 1 is inversely proportional to, and transducer 2 is near more with the distance of electric wire 1, and effective input of transducer 2 is big more, and the effect of energy acquisition is also good more, preferably transducer 2 is close to electric wire 1 outer surface setting.
In the scheme of front, transducer 2 is limited along the size on electric wire 1 cross section, this mainly is because effective input of transducer 2 comes from the average magnetic field intensity in the magnetic field that electric current excites in the electric wire 1 that affacts on the transducer 2, electric wire 1 electric current excites the direction in magnetic field approaching more parallel with the action of a magnetic field direction of transducer 2, effectively input is big more, because the magnetic field that electric wire 1 electric current excites is not equidirectional everywhere outside cable, oversize on the contrary can the cause average magnetic field that affact transducer 2 of transducer 2 on electric wire 1 cross section reduces, transducer 2 then can be unrestricted along the axial dimension of electric wire 1, is the bigger the better on the contrary; A kind of method that can adopt is: axial along electric wire 1, many group transducers 2 are set, every group of transducer 2 has a plurality of, a plurality of transducers 2 circumferentially are provided with along electric wire 1, this has obtained increase with regard to the covert transducer 2 that makes along electric wire 1 axial length, has improved effective input of the average magnetic field of total participation power conversion.
Transducer 2 of the present invention can adopt two kinds of versions:
Wherein a kind of structure is: transducer 2 is by piezomagnetic material layer 2-1 and piezoelectric material layer 2-2 is alternately laminated forms, and piezomagnetic material layer 2-1 is identical with piezoelectric material layer 2-2 shape; The direction of magnetization of piezomagnetic material layer 2-1 is exactly the magnetic action direction of transducer 2, and material layer along the size of electric wire 1 circumferential direction less than 1/4 of electric wire 1 section girth.
Specifically, the transducer 2 of this layer structure can have following three kinds of versions: 1) two-layer stratigraphic structure: a slice piezomagnetic material layer 2-2 and a slice piezoelectric material layer 2-1 formation overall structure that connects together; 2) sandwich structure: a slice piezoelectric material layer 2-1 is clipped between two piezomagnetic material layer 2-2, and the three forms overall structure; 3) multilayer architecture: alternately laminated the sticking together of multi-disc piezomagnetic material layer 2-2 and multi-disc piezoelectric material layer 2-1 forms integral body.
The another kind of structure of transducer 2 is: transducer 2 is made up of the coil 2-3 that is the tubular coiling, the tube axially be exactly the magnetic action direction of transducer 2, the electric wire 1 at central shaft and the transducer 2 positions place of tube excites the direction in magnetic field parallel, and tin along the size of electric wire circumferential direction less than 1/4 of electric wire 1 section girth.
The magnetic core of high magnetic permeability also can be set in the mesopore of the tube that coil 2-3 is surrounded, the input of transducer 2, output are further improved.
In order to increase the effective permeability of magnetic core, can connect the magnetic pole of permanent magnet at the end face (end or two ends) of magnetic core, magnetic core is in certain bias magnetic field.
On aforesaid scheme basis, can utilize the device of gathering electric power supply line magnetic field energy to realize the self energizing of transducer, communicator, this self-powered self-power wireless sensor construction is: it is made up of device, microprocessor and the transducer of communication module, collection supply lines magnetic field energy; Microprocessor is connected with communication module, sensor communication respectively; Communication module is connected with sensor communication; The device of gathering the supply lines magnetic field energy provides electric energy for microprocessor, communication module and transducer.Energy collecting device outputs to microprocessor, communication module and transducer after the electromagnetic energy around the supply lines is converted into electric energy; Microprocessor is controlled the sensor acquisition data and transfer of data is arrived communication module, and transducer is worked under the device power supply of gathering the supply lines magnetic field energy, obtains the state informations such as electric current, temperature or on-the-spot meteorology in the supply line; Microprocessor control communication module sends the data message that collects by cordless communication network to monitoring center.
On aforesaid self-power wireless transducer basis, can also construct the supply lines condition monitoring system that need not outside energy supply, it is made up of a plurality of self-power wireless transducers, cordless communication network and monitoring center; Each self-power wireless transducer communicates to connect by cordless communication network and monitoring center.
Claims (7)
1. gather the device that line current excites magnetic field energy for one kind, it is characterized in that: the field region that electric current excites in electric wire (1) is provided with a plurality of transducers (2) that possess the magnetoelectricity translation function, and the action of a magnetic field direction of transducer (2) is parallel with the magnetic direction that the middle electric current of the electric wire (1) at place, transducer (2) position excites; Transducer (2) along the size of electric wire (1) circumferential direction less than 1/4 of electric wire (1) section girth.
2. the device of collection electric power supply line magnetic field energy according to claim 1, it is characterized in that: transducer (2) is by piezomagnetic material layer (2-1) and piezoelectric material layer (2-2) alternately laminated composition, and piezomagnetic material layer (2-1) is identical with piezoelectric material layer (2-2) shape; The magnetic direction that electric current excites in the electric wire (1) at the interface of material layer and transducer (2) position place is parallel, and material layer along the size of electric wire (1) circumferential direction less than 1/4 of electric wire (1) section girth.
3. the device of collection electric power supply line magnetic field energy according to claim 1, it is characterized in that: transducer (2) is made up of the coil that is the tubular coiling (2-3), electric wire (1) electric current at central shaft and transducer (2) the position place of tube excites the direction in magnetic field parallel, and tin along the size of electric wire (1) circumferential direction less than 1/4 of electric wire (1) section girth.
4. the device of collection electric power supply line magnetic field energy according to claim 3 is characterized in that: the magnetic core that is provided with high magnetic permeability in the mesopore of the tube that coil (2-3) is surrounded.
5. the device of collection electric power supply line magnetic field energy according to claim 4 is characterized in that: the end face of the magnetic core of high magnetic permeability links to each other with the magnetic pole of permanent magnet.
6. self-power wireless transducer that employing is installed according to claim 1 is characterized in that: it is made up of communication module, device, microprocessor and the transducer of gathering the supply lines magnetic field energy; Microprocessor is connected with communication module, sensor communication respectively; Communication module is connected with sensor communication; The device of gathering the supply lines magnetic field energy provides electric energy for microprocessor, communication module and transducer.
7. supply lines condition monitoring system that adopts self-power wireless transducer as claimed in claim 5, it is characterized in that: it is made up of a plurality of self-power wireless transducers, cordless communication network and monitoring center; Each self-power wireless transducer communicates to connect by cordless communication network and monitoring center.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267583A (en) * | 2013-05-27 | 2013-08-28 | 浙江吉隆电力电子科技有限公司 | Magnetic flux leakage energy storage pulse power supplying type wireless temperature detecting probe |
| CN104011970A (en) * | 2011-10-18 | 2014-08-27 | WiTricity公司 | Wireless energy transfer for photovoltaic panels |
| CN104391169A (en) * | 2014-12-19 | 2015-03-04 | 重庆川仪自动化股份有限公司 | Double-wire Hall current sensor |
| CN104584144A (en) * | 2012-08-17 | 2015-04-29 | 马里亚诺·洛佩斯戈麦斯 | Energy extraction system for illuminating cables, among other uses, which comprises a power cable and an energy extraction device; method for manufacturing and repairing said system |
| CN106486468A (en) * | 2015-08-24 | 2017-03-08 | 西门子公司 | The modular device of the power semiconductor modular on low inductance operation DC voltage loop |
| CN107154681A (en) * | 2017-06-05 | 2017-09-12 | 浙江大学 | The distributed data acquisition system that a kind of utilization cable magnetic field powers |
| CN108241126A (en) * | 2016-12-23 | 2018-07-03 | 旺玖科技股份有限公司 | Non-contact intelligent battery sensing system and method |
| WO2020006952A1 (en) * | 2018-07-03 | 2020-01-09 | 清华大学 | Large-range self-energized current sensing apparatus based on anisotropic magnetoresistive effect |
| CN114865801A (en) * | 2022-05-18 | 2022-08-05 | 华北电力大学 | High-energy-density magnetic field energy collecting device and system for three-core cable |
| CN117117756A (en) * | 2023-10-25 | 2023-11-24 | 江苏利宏原电力科技有限公司 | Electric wire frame line street sign indicating number for power transmission |
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Cited By (14)
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| CN104011970A (en) * | 2011-10-18 | 2014-08-27 | WiTricity公司 | Wireless energy transfer for photovoltaic panels |
| CN104584144A (en) * | 2012-08-17 | 2015-04-29 | 马里亚诺·洛佩斯戈麦斯 | Energy extraction system for illuminating cables, among other uses, which comprises a power cable and an energy extraction device; method for manufacturing and repairing said system |
| CN103267583A (en) * | 2013-05-27 | 2013-08-28 | 浙江吉隆电力电子科技有限公司 | Magnetic flux leakage energy storage pulse power supplying type wireless temperature detecting probe |
| CN104391169A (en) * | 2014-12-19 | 2015-03-04 | 重庆川仪自动化股份有限公司 | Double-wire Hall current sensor |
| CN106486468A (en) * | 2015-08-24 | 2017-03-08 | 西门子公司 | The modular device of the power semiconductor modular on low inductance operation DC voltage loop |
| CN106486468B (en) * | 2015-08-24 | 2019-03-15 | 西门子公司 | The modular device of power semiconductor modular on low inductance operation DC voltage circuit |
| CN108241126A (en) * | 2016-12-23 | 2018-07-03 | 旺玖科技股份有限公司 | Non-contact intelligent battery sensing system and method |
| CN108241126B (en) * | 2016-12-23 | 2020-11-10 | 旺玖科技股份有限公司 | Non-contact intelligent battery sensing system and method |
| CN107154681A (en) * | 2017-06-05 | 2017-09-12 | 浙江大学 | The distributed data acquisition system that a kind of utilization cable magnetic field powers |
| WO2020006952A1 (en) * | 2018-07-03 | 2020-01-09 | 清华大学 | Large-range self-energized current sensing apparatus based on anisotropic magnetoresistive effect |
| CN114865801A (en) * | 2022-05-18 | 2022-08-05 | 华北电力大学 | High-energy-density magnetic field energy collecting device and system for three-core cable |
| CN114865801B (en) * | 2022-05-18 | 2024-07-02 | 华北电力大学 | High-energy-density magnetic field energy collection device and system for three-core cable |
| CN117117756A (en) * | 2023-10-25 | 2023-11-24 | 江苏利宏原电力科技有限公司 | Electric wire frame line street sign indicating number for power transmission |
| CN117117756B (en) * | 2023-10-25 | 2024-01-30 | 江苏利宏原电力科技有限公司 | Electric wire frame line street sign indicating number for power transmission |
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Application publication date: 20111228 |