WO2023023834A1 - Agencement introduit dans un dispositif passif adaptateur pour capteur de courant - Google Patents

Agencement introduit dans un dispositif passif adaptateur pour capteur de courant Download PDF

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Publication number
WO2023023834A1
WO2023023834A1 PCT/BR2022/050335 BR2022050335W WO2023023834A1 WO 2023023834 A1 WO2023023834 A1 WO 2023023834A1 BR 2022050335 W BR2022050335 W BR 2022050335W WO 2023023834 A1 WO2023023834 A1 WO 2023023834A1
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WIPO (PCT)
Prior art keywords
fbg
current sensor
case
optical
adapter device
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PCT/BR2022/050335
Other languages
English (en)
Portuguese (pt)
Inventor
Cláudia Maria COIMBRA
Marcelo DE MORAES
Victor Baiochi RIBOLDI
Fabio Renato BASSAN
João Batista ROSOLEM
Rivael Strobel PENZE
Claudio Floridia
Artur de Araujo SILVA
Rodrigo PERES
Eduardo Ferreira DA COSTA
João Paulo Vicentini FRACAROLLI
Bruno Nogueira AIRES
Ronaldo Antonio Roncolatto
João Roberto NOGUEIRA JÚNIOR
Original Assignee
Companhia Paulista De Força E Luz - Cpfl
Companhia Piratininga De Força E Luz
Companhia Jaguari De Energia
Rge Sul Distribuidora De Energia S.A.
Fundação Cpqd – Centro De Pesquisa E Desenvolvimento Em Telecomunicações
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Application filed by Companhia Paulista De Força E Luz - Cpfl, Companhia Piratininga De Força E Luz, Companhia Jaguari De Energia, Rge Sul Distribuidora De Energia S.A., Fundação Cpqd – Centro De Pesquisa E Desenvolvimento Em Telecomunicações filed Critical Companhia Paulista De Força E Luz - Cpfl
Publication of WO2023023834A1 publication Critical patent/WO2023023834A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/12—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/22—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-emitting devices, e.g. LED, optocouplers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/02—Measuring effective values, i.e. root-mean-square values
    • G01R19/03—Measuring effective values, i.e. root-mean-square values using thermoconverters

Definitions

  • This utility model refers to a new provision introduced in a mechanical device adapter for current sensor.
  • the mechanical device adapter for current sensor is applicable in underground and overhead electric power distribution networks, in cables already installed and to be installed, providing a mechanical device to allow the adaptation of sensors fiber optic current Fiber Bragg Grating, FBG, easy to install “plug-and-play” type, without prejudice to the other functionalities already performed by the energy network.
  • the electric power distribution network both underground and aerial, is subject to several external factors that can affect its capacity and integrity, making regulatory bodies and consumer needs constantly met.
  • the quality of services provided includes the assessment of interruptions in the supply of electricity and collective and individual continuity indicators existing in standards such as “Electric Energy Distribution Procedures in the National Electric System - PRODIST Module 8 - Electricity Quality”. Fines and compensation arising from the low quality of energy supplied can reach high annual amounts. Monitoring the performance of networks is therefore necessary.
  • One of the key equipment for monitoring the distribution network is the current meter, with which power quality parameters, losses or faults can be measured. Due to the use by consumers of various industrial equipment that generate harmonics monitoring of power quality becomes important. Current meters commonly used today depend on locally available low-voltage power supply, which is not always possible, and on a GPRS communication network that often has connection problems or does not have local coverage.
  • Fiber optic sensors are ideal for monitoring power grid parameters, mainly current and voltage, due to their small size, low cost and their ability to be embedded in transducer elements to capture numerous parameters.
  • Fiber optic sensors of the type FBG Fiber Bragg Grating have the advantages of presenting a linear response independent of the signal intensity, of being passive, that is, of not needing electrical power and of enable the formation of sensor networks on a single fiber.
  • FIGs l.a and l.b illustrate a schematic example of an FBG type sensor.
  • the implicit principle in measurements based on sensors of the type FBG 1 inserted in an optical fiber 3 with polymeric coating 5 is the detection of the optical signal reflected from the FBG 7.
  • the wavelength of the light reflected from the FBG is reduced if the period A decreases due to the compression of the length L of the optical fiber.
  • the wavelength of light reflected from the FBG increases if the period A increases due to the deformation of the length L of the optical fiber as seen in Figure 1.b.
  • the optical fiber containing the FBG is fixed on a substrate 9 using an appropriate fastener element 11 at both ends of the length of optical fiber containing the FBG, as shown in Figure l.c.
  • the use of double fixation limits the use of the FBG as a pressure sensor in environments with reduced physical space.
  • this utility model proposes the exploration of techniques for varying the wavelength of said FBG sensor by the action of the magnetic field generated by the current in the substrate that supports the fiber optics containing said FBG sensor.
  • the patent document CN110785666A (MULTI-PHASE SENSOR MODULE, SYSTEM AND METHOD) describes a sensor module capable of measuring the voltage between the phases of a multiphase power cable, such as a three-phase cable.
  • a multiphase power cable such as a three-phase cable.
  • This type of cable can be used in power transmission in a submarine or underground environment.
  • the sensor does not require a power source and is based on the use of optical fibers typically present in these cables to carry light to the sensor.
  • FBG-based sensors sample the electric field between conductors and convert into fiber strain and certain wavelengths of reflected light are modulated by the instantaneous amplitude of the phase-phase voltage to be measured.
  • the sensor module embodying the invention contains spacers that maintain the conductors in a predetermined geometry and position the sensors FBG between pairs of conductors on which phase-to-phase voltage measurements are to be performed.
  • the interrogation system can extract and insert interpret the modulation of these wavelengths to infer the measured voltage value.
  • the invention can be incorporated into a repair splice for retrofit purposes and can also be incorporated into FBG-based current sensors to simultaneously measure conductor current.
  • the current sensor comprises an FBG in contact with the piezoelectric element, wherein the piezoelectric element is connected in parallel with a current transformer or Rogowski coil and a load resistor.
  • the sensor module thus constituted does not use a magnetostrictive element positioned close to and on the side of a ferromagnetic core such as ferrite in mechanics that allows opening and closing and easy placement on the cable of a medium voltage power distribution system.
  • CN108226819A A KIND OF GROUND MAGNETIC FIELD MONITORING SYSTEM AND METHOD BASED ON FIBER GRATING
  • the system includes sequentially connected pulsed light generating unit, one FBG detection unit and optical signal processing unit.
  • the pulsed light generating unit is used to generate pulsed light which is transmitted to the FBG detection unit which is embedded under the surface layer of the ground and reflects various optical signals at different locations and various optical signals are transmitted to the pulsed light processing unit.
  • optical signal where the optical reception signal is converted into an electrical signal, finally being monitored the terrestrial magnetic field according to the received electrical signal.
  • the invention improves the accuracy and reliability for monitoring and evaluating the earth's magnetic field, effectively reducing erroneously reported ground magnetic field vibrations and being able to give early warning of changes in the ground magnetic field.
  • the proposed soil magnetic field monitoring system and method does not use magnetostrictive element positioned close to and on the side of a ferromagnetic core such as ferrite in mechanics that allows opening and closing and easy placement on the cable of a medium voltage power distribution system, despite using FBG and optical fibers for monitoring magnetic fields it does not do so in the context of measuring cables in an electrical energy distribution system, being applied to monitoring the soil magnetic field.
  • KR101478693B1 PLACE DETECTING DEVICE OPTICAL FIBER GRATINGS OF OVER-ELECTRIC CURRENT AND DISCONNECTION FOR DISTRIBUTED POWER LINES describes an apparatus for detecting an abnormal current and a disconnection position in a distribution line.
  • the apparatus comprises: a detection unit fixed at predetermined intervals by a clamp (clamp) on a power distribution line and which detects a disconnection of a power distribution line and an abnormal current generation through an induced electromotive force; a detector for comparing a signal detected by the detection unit with a defined signal to determine whether a disconnection of a power distribution line or an abnormal current is generated.
  • the apparatus for detecting an abnormal current and a disconnection of a distribution line consists of an electromagnet magnetized by an electromotive force induced from an abnormal current which is wound around an electromagnet coil consisting of an induction coil and a closed circuit wound around the fastening means and an electromagnet coil magnetized at one end of the electromagnet, an elastic element which is installed in close proximity to the FBG and which is connected to both sides of the FBG which has different central wavelengths depending on the installation position and that pulls the FBG portion in an opposite direction to the electromagnet.
  • the electromagnet, the FBG portion and the elastic element are built-in.
  • the detection unit transmits the detection information to the management server connected to the communication network when it is determined that disconnection and abnormal current are generated in the distribution line.
  • the apparatus thus constituted does not use a magnetostrictive element positioned close to and on the side of a ferromagnetic core such as ferrite in mechanics that allows opening and closing and easy placement on the cable of a medium voltage power distribution system, despite using FBG and fibers optics for current monitoring, it does not do so in the context of measuring cables in an electrical energy distribution system, being applied to overcurrent detection and disconnection of these cables.
  • patent document CN103207310A BLAZED FIBER BRAGG GRATING BASED CURRENT CHANGE DETECTION DEVICE describes a current change detection device based on blazed-FBG (BFBG), FBG with inclined index profile, and comprises a light source, a single-mode fiber, a BFBG that is filled with a magnetic fluid, an energized solenoid coil, and a spectrograph, wherein the light source is connected to the BFBG through the single-mode fiber, an output of the BFBG is connected to the spectrograph through the single-mode fiber and the BFBG is placed inside the energized solenoid coil.
  • BFBG blazed-FBG
  • a magnetic field is provided by the energized solenoid coil and acts on the magnetic fluid, the resonant wavelength of the BFBG changes as a function of the refractivity of the magnetic fluid under the action of the magnetic field and is detected by the central wavelength shift, so that the magnitude of the exerted magnetic field can be detected indirectly and the magnitude of the currents can be inverted through the magnetic field.
  • the apparatus thus constituted does not use a magnetostrictive element positioned close to and on the side of a ferromagnetic core such as ferrite in mechanics that allows opening and closing and easy placement on the cable of an energy distribution system medium voltage, moreover it uses common BFBG and non-FBG that are more widespread as technology.
  • a first magnetostrictive material and two magnetostrictive materials when the ambient temperature changes, the two magnetostrictive materials expand when heated and contract when cooled, due to the sum of the lengths of the two magnetostrictive materials are equal to the length of the first magnetostrictive material, the extents of expansion caused by temperature for the first magnetostrictive material and the second magnetostrictive materials are also equal, but the first magnetostrictive material and the second magnetostrictive materials have opposite directions of extension or shortening of so that the distance between the two second magnetostrictive materials is not changed, i.e.
  • a temperature compensation material eliminates the thermo-optical effect of an FBG, thus eliminating the influence of temperature environment in magnetostrictive materials and FBG.
  • the apparatus described does not use the magnetostrictive element positioned close to and on the side of a ferromagnetic core such as ferrite in mechanics that allows opening and closing and easy placement on the cable of a medium power distribution system voltage, being the focus of this invention the temperature compensation of the environment on the sensor.
  • a sensor is described of current including a voltage distribution converter with a coupled FBG and a magnetostrictive material associated with the voltage distribution converter such that the change in shape of the magnetostrictive material causes a change in the length of the FBG, in one embodiment another material with the same thermal expansion, like the MONEL 400, is used to compensate for external temperature effects.
  • FBG and magnetostrictive materials the device described does not use said magnetostrictive element positioned close to and on the side of a ferromagnetic core such as ferrite in mechanics that allows opening and closing and easy placement on the cable of a medium power distribution system voltage.
  • a FBG current transformer that employs the double rod differential formula applied to measure the grounding current of the power cable sheath, including: a first induction unit comprising a magnetizer and a first induction coil, the magnetizer having a hollow rectangular shape and the first induction coil being wound on a transverse edge of the magnetizer; the second induction unit comprising a second induction coil induction coil, an iron core, an outer support structure and two magnetic deformation units, the second induction coil is wound on the iron core, the left end and the right end of the outer support structure are respectively fixed to a magnetic deformation along the vertical direction, the upper end of each deformation unit ma magnetic is provided with a magnet, the magnet is positioned in the center position of the second induction coil, and the magnetic induction lines of the magnets at the upper ends of the two magnetic deformation units point in
  • the detection reliability of the FBG current transformer is improved and the influence of ambient temperature change on the detection accuracy is reduced.
  • the apparatus thus constituted does not use a magnetostrictive element positioned close to and on the side of a ferromagnetic core such as ferrite in mechanics that allows opening and closing and easy placement on the cable of a medium voltage power distribution system, nor does the set described point to this ease of installation.
  • Document CN206362915U presents the utility model of a type of magnetic field sensor in which extrinsic Fabry - Perot (FP) resonators and magnetic fluid are built with FBGs including: broadband light source, single-mode fiber, a first FBG, a second FBG, capillary quartz glass tube, magnetic fluid, epoxy resin, micro-displacement platform, magnetic field generator and spectrometer.
  • the micrometric space between the faces of axially aligned FBGs forms new extrinsic FP resonators.
  • the index of refraction of the magnetic fluid between the end face of the fiber changes with the strength of the magnetic field, the change in the Free Spectral Range (Free Spectral Range) of the FP resonators is shown as the length of the phase shift peak in the transmitted spectrum and shifted, the external magnetic field information is demodulated by monitoring the wavelength change.
  • Magnetic field strength detection becomes highly sensitive with reference to the tunable refractive index and high resolution characteristic of magnetic fluid FP resonators.
  • the utility model has the advantages of compact conformation, high sensitivity and the flexibility of being able to be multiplexed with this system. optical fiber detection.
  • the apparatus thus constituted does not use a magnetostrictive element positioned close to and on the side of a ferromagnetic core such as ferrite in mechanics that allows opening and closing and easy placement on the cable of a medium voltage power distribution system, nor does the set described point to this ease of installation.
  • the device comprises an induction unit, a deformation unit and a demodulator;
  • the induction unit comprises a magnetizer and a first induction coil, the magnetizer has a hollow rectangular shape, and the first induction coil is wound on a transverse edge of the magnetizer;
  • the deformation unit comprises a linear elastic body, a second induction coil, an FBG and magnets, the FBG is arranged in the middle of the linear elastic body, two ends of the linear elastic body are respectively provided with a magnet, the second induction coil is wound on the linear elastic body and is connected to the first induction coil through a conductor, the polarity directions of the two magnets are the same, and the FBG generates corresponding deformation along with the stretching or compression of the linear elastic body;
  • the demodulator is connected to the FBG via a fiber jumper.
  • the apparatus thus constituted does not use a magnetostrictive element positioned close to and on the side of a ferromagnetic core such as ferrite in mechanism that allows opening and closing and easy placement on the cable of a medium voltage power distribution system, not even the described set points to this ease of installation.
  • Step 1 Design of a three-dimensional magnetic field detection mechanism
  • Step 2 Positioning the sensor
  • Step 3 The stress function is derived from the DEFORMATION RESPONSE function
  • Step 4 Amount of displacement of the center of the FBG sensor and the structure based on the relational model between the curvature obtained by magnetic induction and the function of the second derivative of the deformation of the cantilevered beam
  • Step 5 Magnetic induction intensity of a three-dimensional cantilevered beam based on the wavelength shift from the center of the FBG from which the construction of the model with the double parameters of electric current is deduced.
  • the method thus constituted does not use a magnetostrictive element positioned close to and on the side of a ferromagnetic core such as ferrite in mechanics that allows opening and closing and easy placement on the cable of a medium voltage power distribution system, nor does the set described point to this ease of installation.
  • a type of frequency detection sensing system for improving a current sensor based on fiber optics, the detection subsystem includes circuit magnetic conductor, pole of orientation and sensing probe, the first end of the magnetic conductor circuit is electrically connected to the middle part of the orientation pole, the edge of the orientation pole is electrically connected with the first end of the sensing probe, and the second end of the sensing probe is electrically connected with the second end of the magnetic conductor circuit.
  • the NdFeB material is embedded in the magnetic conductor circuit
  • the sensing probe includes the probe and connector
  • the connector is fixedly connected in the center of the probe, and the probe is mutually perpendicular to the connector
  • the shape of the sensing probe is T-shaped.
  • the sensing probe is made of stainless steel and the connector is made of Terfenol-D.
  • the T-shaped structure of the probe improves the upper limit of the sensor device's resonant frequency.
  • the apparatus thus constituted does not use a magnetostrictive element positioned close to and on the side of a ferromagnetic core such as ferrite in mechanics that allows opening and closing and easy placement on the cable of a medium voltage power distribution system, nor does the set described point to this ease of installation.
  • a fiber optic current sensor for subway/coal mine based on a composite material comprising a magnetic circuit detection system and a photoelectric test system, wherein the magnetic circuit detection system comprises a wire, a magnetic conductive circuit, a magnetostrictive composite material (Terfenol-D), an FBG and two permanent magnets.
  • the photoelectric test kit comprises a broadband light source, a circulator, a FBG demodulation device, a photodiode, an amplifier and an oscilloscope.
  • the magnetic conductive material is arranged to have a circular ring structure and the composite material magnetostrictive is arranged to have a cylindrical structure, so that magnetic flux density concentration is carried out.
  • the magnetostrictive composite material is the sensitive element of the sensor, the two permanent magnets which are equal in magnetism and have a certain difference in magnetic induction intensity are mounted together, so that a direct current polarizing magnetic field is provided to the sensor and a certain voltage is supplied to both ends of the magnetostrictive material. Also in document CN111308155 A, a current measurement method using the proposed sensor is described.
  • the senor is placed around a conductor, located in the center of the circle formed by the component of magnetically permeable material composed of two components of annular magnetically permeable material symmetrically distributed.
  • a conductor When the conductor is energized, a magnetic field is formed.
  • the magnetic material component converges the magnetic field and transmits it to the magnetostrictive composite material component, so that the latter generates (mechanical) voltage under the excitation of the magnetic field.
  • the deformation generated by the magnetostrictive composite material component will cause the FBG attached to the surface of the magnetostrictive composite material component (Terfenol-D) to deform, and the deformation of the FBG will cause the central wavelength to change.
  • This change is detected by the photoelectric section of the circuit, which comprises a broadband light source, a circulator, an FBG demodulation device, a photodiode, an amplifier and an oscilloscope.
  • An example of the magnetic coupling described in the article consists of two magnetic collector pieces (MCP) whose material is paramagnetic.
  • MCP magnetic collector pieces
  • the magnetic collector pieces are installed close to the high current conductor, whatever its shape, circular or rectangular, and FBG sensors are used to obtain the force between the two magnetic collector pieces and the conductor.
  • FBG sensors are used to obtain the force between the two magnetic collector pieces and the conductor.
  • the magnetic collector pieces will move to where the magnetic line is most dense.
  • the beam of light coming from an optical source is placed on the FBG sensors through a stretch of optical fiber and is reflected to the interrogators who interpret the signal from the sensor and show the measurement from a distance.
  • the operating point GMM-FBG sensor quiescence confirmed;
  • the material size in the magnetic circuit system has been optimized to ensure the good output performance of the detection system.
  • the numerical relationship between the excitation current and the internal magnetic field of the Terfenol-D rods (GMM material) was established.
  • Sensor calibration was also carried out using the GMM-FBG current transformer sensor experimental system.
  • this model of utility provides an arrangement inserted into a passive current sensor adapter device, the device comprising: a core case comprising two components, each of the components housing a magnetic core, and each of the components comprising a recess to form a passageway for positioning the core case around an electrical conductor in the closed position; and an optical case fixed laterally to the core case, wherein the optical case houses, laterally to the magnetic cores, an optical fiber sensor Fiber Bragg Grating, FBG, connectable to an optical fiber cable and fixed to a magnetostrictive element.
  • FBG Fiber Bragg Grating
  • Figures l.a to l.c illustrate a generic design of the operation of an optical fiber sensor of the Fiber Bragg Grating, FBG type, with two fixation points.
  • Figure 2 shows a perspective view of the mechanical device adapter for current sensor according to the present utility model.
  • Figure 3 shows a perspective view of the magnetic core kit and how they are inserted into such a kit according to the present utility model.
  • Figure 4 shows a second view in perspective mechanical device adapter for current sensor according to the present utility model.
  • Figure 5 shows a perspective cut of the core case and their positioning inside according to the present utility model.
  • Figure 6 shows a perspective view of the optical case according to the present utility model.
  • Figure 7 shows a perspective view of the open optical case and its constituent elements according to this utility model.
  • Figure 8 shows a detailing of the open optical case and its constituent elements according to this utility model.
  • This utility model refers to a new provision introduced in a mechanical device adapter for current sensor. Next, the disposition of the mechanical device adapter for current sensor will be described, where the configuration, size and way of application can vary in the appropriate way for each desired model; describing the main utility model that leads to the realization of the described object and the way it works.
  • Figure 2 illustrates a mechanical device adapter for current sensor 19 attached to an electrical conductor 25 for current detection.
  • the device according to the proposed arrangement is preferably used for an optical fiber sensor of the Fiber Bragg Grating, FBG type.
  • the device 19 is fundamentally composed of a core case 21 for housing magnetic cores, the core case 21 and an optical case 23 laterally attached to the core case 21.
  • the core case 21 and the optical case 23 are made of a material that enables the magnetization of the magnetic cores, being preferably made of polymeric material.
  • the core case 21 is formed by two components 21a, 21b, each housing a magnetic core 33 and comprising a concavity to form a passage for positioning the core case around the electrical conductor 25 na closed position.
  • the magnetic cores 33 are preferably made of bipartite ferrite, nanocrystalline cores or other ferromagnetic materials with the function of concentrating the magnetic field.
  • the magnetic cores 33 are housed inside the components 21a, 21b of the core case 21 in a reserved space and suitably sized.
  • the components 21a, 21b of the core case 21 each comprise a cavity 35 which is designed for the insertion of the magnetic cores 33.
  • Fixing caps 37 are used to complete and close the core case 21.
  • the components 21a, 21b of the core case 21 are joined by means of a hinge 31 allowing displacement for hinged opening or closing movement.
  • the components 21a, 21b can be joined by other forms of fitting, such as corresponding latches that allow the core case 21 to be closed for installation around an electrical conductor 25.
  • the core case 21 can optionally comprise a quick coupling device 22, 24 that allows the entire core case 21 to remain correctly fixed.
  • the engagement device is formed by a tab 24 having an opening positioned on a first component 21a of the core case 21 and extending beyond its end.
  • On the second component 21b there is a latch 22, like an inclined shoulder, positioned so as to engage the opening of the tab 24 for engagement when the components 21a, 21b move towards each other in the closing movement of the assembly.
  • the flap 24 is pressed against the latch 22 until it disengages from the flap opening, releasing the assembly.
  • the current sensor can be installed easily, preferably in the “plug-and-play” type, without prejudice to the other functionality already performed by the power grid.
  • the mechanical current sensor adapter device 19 may also comprise a fastener 27 and a conductor fastener 29 in the core case 21 which is driven by means of the fastener 27 to secure the assembly in the electrical conductor 25.
  • the fastener 27 has a screw thread, preferably made of metallic material, and, as it moves inwards in a thread in the core case 21, presses against the conductor fastener 29. To release the conductor 25, the fastener 27 is counter-rotated out of the thread in the core case 21.
  • Figure 6 shows a perspective view of the optical case 23 and the fiber optic cable or cord 39 that enters the structure.
  • the optical case 23 houses an optical fiber sensor of the Fiber Bragg Grating, FBG type, adhered to a magnetostrictive material, laterally and close to the magnetic cores of the current sensor.
  • FBG Fiber Bragg Grating
  • Figure 7 shows a perspective view of the open optical case 23 and its constituent elements.
  • the optical case 23 internally comprises accommodation channels 43 for the respective internal part of the optical fiber cord 39 which extends until it is spliced with the optical fiber coming from the FBG 45.
  • the optical fiber cord 39 is fixed by the fiber fastener 41, which is formed by a plate positioned on the optical fiber 39 fixed by means of screws.
  • the optical splice 51 is housed in a space specially provided for this purpose in the optical case 23.
  • the optical fiber 45 preferably of the single-mode type, runs along its path in its accommodation space and is directed to the element of magnetostrictive material 47, which has the property of changing shape or size during the magnetization process, being preferably made of Terphenol-D, which is sensitive to the magnetic field.
  • the element of magnetostrictive material 47 which has the property of changing shape or size during the magnetization process, being preferably made of Terphenol-D, which is sensitive to the magnetic field.
  • Terphenol-D Terphenol-D
  • the current flowing through the conductor 25 generates a magnetic field that is concentrated by the magnetic cores 33 positioned in the core case 21 and whose flux lines excite the magnetostrictive element 47 that has the FBG 45 adhered positioned in the optical case 23.
  • the element of magnetostrictive material 47 is sensitive to the magnetic field that circulates through the magnetic cores 33, as it has the property of changing shape or size during the magnetization process. Therefore, the magnetostrictive material 47 deforms as the magnetization changes. In this way, the sensitive portion of the optical fiber, that is, the portion comprising the FBG 45 that is adhered to the magnetostrictive material 47, has its length varied according to the variation of the magnetic field.
  • the arrangement formed by the optical case 23 fixed laterally to the core case 21 allows the current sensor to detect the current flowing through the conductor 25 and to be installed in a practical and agile way.
  • the provision introduced to the passive current sensor adapter device presents a new and unique configuration that provides a functional improvement, configuring great advantages in relation to devices of this nature already known.
  • the FBG and the ferromagnetic core are in separate modules independent of the ferromagnetic core, where the FBG is installed on the side and close to the ferromagnetic core.
  • the present utility model presents a functional improvement by providing a versatile configuration that allows its fixation in energy cables of the underground or aerial distribution network, already installed or to be installed in an easy way, of the “plug-and-play” type, it also makes it possible to measure and monitor the current in real time, without the need for an operator at the installation and removal site of the device.
  • the proposed arrangement is advantageous because it is applicable to the use of fiber optic sensors, which are small in size, low cost and present linear response and are passive.

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  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

Le présent modèle d'utilité concerne un agencement introduit dans un dispositif passif adaptateur pour capteur de courant. Ledit dispositif comprend un boîtier à noyau comportant deux composants, chacun des composants logeant un noyau magnétique et chacun des composants comportant une concavité pour former un passage pour le positionnement du boîtier à noyau autour d'un conducteur électrique en position fermée ; et un boîtier optique fixé latéralement au boîtier à noyau, ledit boîtier optique logeant latéralement les noyaux magnétiques, un capteur à fibres optiques de type "Fiber Bragg Grating", FBG, connectable à un câble à fibres optiques et fixé à un élément magnétostrictif.
PCT/BR2022/050335 2021-08-27 2022-08-26 Agencement introduit dans un dispositif passif adaptateur pour capteur de courant WO2023023834A1 (fr)

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BR202021017059-5U BR202021017059U2 (pt) 2021-08-27 2021-08-27 Disposição introduzida em dispositivo passivo adaptador para sensor de corrente

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102156212A (zh) * 2011-01-04 2011-08-17 武汉理工大学 磁力耦合式光纤光栅大电流测量方法及装置
US20140132256A1 (en) * 2012-11-14 2014-05-15 Uwm Research Foundation, Inc. Current sensors using magnetostrictive material
WO2014090324A1 (fr) * 2012-12-14 2014-06-19 Aktiebolaget Skf Ensemble capteur à fibre optique
US20150069996A1 (en) * 2012-01-23 2015-03-12 Kabushiki Kaisha Toyota Jidoshokki Optical fiber for a sensor and a power device monitoring system
CA3015808A1 (fr) * 2017-08-30 2019-02-28 Fibercore Limited Systeme de mesure
US10989615B2 (en) * 2019-01-03 2021-04-27 Dalian University Of Technology Non-destructive monitoring method for internal pressure intensity of pipeline
US11002594B2 (en) * 2015-11-20 2021-05-11 Sentek Instrument, Llc Method and apparatus for distributed sensing

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102156212A (zh) * 2011-01-04 2011-08-17 武汉理工大学 磁力耦合式光纤光栅大电流测量方法及装置
US20150069996A1 (en) * 2012-01-23 2015-03-12 Kabushiki Kaisha Toyota Jidoshokki Optical fiber for a sensor and a power device monitoring system
US20140132256A1 (en) * 2012-11-14 2014-05-15 Uwm Research Foundation, Inc. Current sensors using magnetostrictive material
WO2014090324A1 (fr) * 2012-12-14 2014-06-19 Aktiebolaget Skf Ensemble capteur à fibre optique
US11002594B2 (en) * 2015-11-20 2021-05-11 Sentek Instrument, Llc Method and apparatus for distributed sensing
CA3015808A1 (fr) * 2017-08-30 2019-02-28 Fibercore Limited Systeme de mesure
US10989615B2 (en) * 2019-01-03 2021-04-27 Dalian University Of Technology Non-destructive monitoring method for internal pressure intensity of pipeline

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