CN115714474A - Cable unilateral energy taking device - Google Patents
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Abstract
The invention relates to a cable unilateral energy-taking device, wherein a coil is sleeved outside a magnetic core group, the magnetic core group comprises a plurality of electric core monomers which are arranged in parallel and are mutually contacted, the magnetic core monomers are moved along the length direction of the magnetic core monomers, so that the effective length of the magnetic core group is increased, the magnetic conductivity is improved, and the two ends of the magnetic core group are provided with enlarged plates, so that the radial sizes of the two ends of the magnetic core group along the magnetic core monomers are increased, the magnetic conductivity is further improved, and the output power of the cable unilateral energy-taking device is obviously improved. Above-mentioned cable unilateral can get when installing the use arrange in one side of cable can, solved get can install with different voltage classes and the compatible problem of cable diameter adaptation, greatly improved the universality, can also keep higher output through portable elongated magnetic core group and the increase board that is located the magnetic core group both ends simultaneously, be the breakthrough to traditional technique.
Description
Technical Field
The invention relates to the technical field of induction energy taking, in particular to a cable unilateral energy taking device.
Background
With the proposal of the targets of 'carbon peak reaching and carbon neutralization' and a novel power system taking new energy as a main body, the energy technology is further deeply fused with the digital technology. The power supply problem of the power sensor is a core problem which restricts the large-scale application of the power sensor. The current power supply method for the electric power on-line monitoring sensor mainly comprises battery power supply, solar power supply, laser power supply, resonance coupling energy acquisition, vibration energy acquisition, capacitance partial pressure energy acquisition, magnetic field induction energy acquisition and the like, wherein the induction energy acquisition is most widely applied due to the stability and maturity of the induction energy acquisition.
For an alternating magnetic field generated by an alternating Current cable and a line, the most common magnetic induction energy obtaining method is CT (Current Transformer) energy obtaining. The induction energy taking device mainly uses a current transformer to directly induce alternating voltage from a high-voltage bus, then obtains stable and reliable direct voltage through rectification, filtering and voltage stabilization treatment, provides a stable power supply for a sensor arranged nearby, and can ensure long-term stable power supply.
The induction energy-taking device mainly comprises a current transformer and a processing circuit at the rear end. The core devices in the current transformer are a magnetic core and a coil, the magnetic flux is gathered, and the energy taking efficiency and reliability are improved. In order to protect the energy taking device, an open-close type CT (computed tomography) device is provided, but a ring type magnetic core of the CT device is required to be designed according to the size of a corresponding cable and cannot be suitable for cables with different voltage levels, the universality is poor, the CT device cannot be quickly installed, meanwhile, the open-close type magnetic core is formed by combining an upper magnetic core and a lower magnetic core, the magnetic core is easy to displace when sealant is poured, and the problem that the magnetic core is asymmetrical and mistakenly touched when equipment is closed is caused.
At present, technicians gradually research on non-closed type CT, the existing non-closed type CT can be applied to cables with different voltage levels and different sizes, but still has limitations, and the problem that the universality and the high power are difficult to be compatible still needs to be solved.
Disclosure of Invention
In view of the above, there is a need for a cable unilateral energy-extracting device with higher universality and higher power.
The invention provides a cable unilateral energy-taking device, which comprises:
the magnetic core group is arranged on one side of a cable, enlarged plates are arranged at two ends of the magnetic core group, the magnetic core group comprises a plurality of magnetic core monomers, the magnetic core monomers are arranged in parallel and are in contact with each other, the magnetic core monomers can move relatively in the length direction of the magnetic core monomers, so that the length of the magnetic core group is changed, and the radial size of the end part of each magnetic core monomer, which is provided with the enlarged plate, of each magnetic core monomer is larger than the radial size of each magnetic core monomer;
and the coil is sleeved outside the magnetic core group.
In one embodiment, the enlarged plate is located outside the coil.
In one embodiment, the magnetic core units are configured as a first magnetic core and a second magnetic core, and the enlarged plates are disposed at ends of the second magnetic core.
In one embodiment, the enlarged plate covers an end face of the second magnetic core.
In one embodiment, the end face of the second magnetic core is located in the middle of the enlarged plate.
In one embodiment, the first magnetic core and the second magnetic core are cylinders or square columns.
In one embodiment, the enlarged plate is a cylinder or a square column.
In one embodiment, at least a portion of the first and second magnetic cores is located within the coil.
In one embodiment, the port of the coil is provided with a capacitor, and the capacitor is connected with the coil in series or in parallel.
In one embodiment, the cable unilateral energy-taking device is connected with an electric energy management module, and the electric energy management module processes and outputs the energy obtained by the cable unilateral energy-taking device.
According to the cable unilateral energy taking device provided by the invention, the coil is sleeved outside the magnetic core group, the magnetic core group comprises a plurality of electric core monomers which are arranged in parallel and are mutually contacted, the magnetic core monomers are moved along the length direction of the magnetic core monomers, so that the effective length of the magnetic core group is increased, the magnetic conductivity is improved, and the enlarged plates are arranged at the two ends of the magnetic core group, so that the radial sizes of the two ends of the magnetic core group along the magnetic core monomers are increased, the magnetic conductivity is further improved, and the output power of the cable unilateral energy taking device is obviously improved. Above-mentioned cable unilateral can get when installing the use arrange in one side of cable can, solved get can install with different voltage classes and the compatible problem of cable diameter adaptation, greatly improved the universality, can also keep higher output through portable elongated magnetic core group and the increase board that is located the magnetic core group both ends simultaneously, be the breakthrough to traditional technique.
Drawings
Fig. 1 is a schematic view of a cable single-sided energy-harvesting device according to some embodiments of the present application;
FIG. 2 is a cross-sectional view of a cable single-sided energy harvesting device of some embodiments of the present application taken along a radial direction of a core set;
fig. 3 is a schematic diagram of the application of some cable unilateral energy-taking devices.
Reference numerals:
10. a cable unilateral energy-taking device; 110. a magnetic core group; 1100. enlarging the plate; 1110. a first magnetic core; 1120. a second magnetic core; 120. a coil; 20. an electric energy management module; 30. a cable; 40. a sensor.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "lateral," "length," "upper," "lower," "front," "rear," "left," "right," "horizontal," "top," "bottom," "inner," "outer," "radial," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.
In order to ensure the safe operation of the power cable, the operation state of the power cable needs to be monitored by the sensor in real time on line, and the self-power supply problem of the sensor is a core problem which restricts the large-scale application of the sensor. High-voltage transmission lines are usually distributed in the field with rare human smoke, the environment around the lines is filled with strong electromagnetism, and the transmission lines cannot be directly used for supplying power to sensors for on-line monitoring.
The Current power on-line monitoring sensor power supply method is most widely applied to induction energy taking, aiming at an alternating magnetic field generated by an alternating Current cable and a circuit, the most common magnetic induction energy taking mode is CT (Current Transformer) energy taking, an induction energy taking device mainly uses a Current Transformer to directly induce alternating Current voltage from a high-voltage bus, and then stable and reliable direct Current voltage is obtained through rectification, filtering and voltage stabilization treatment, so that long-term stable power supply is provided for sensors installed nearby. Because the current-carrying capacity of the alternating current cable changes along with factors such as load and the like, when the current-carrying capacity is small, the energy-taking power of a CT magnetic core coil is low, an energy-taking dead zone exists, and when the current-carrying capacity is large, the CT magnetic core is saturated, so that the heating of the magnetic core and the reduction of the energy-taking efficiency are caused, and the influence on a post-stage circuit is also generated. In order to protect the energy taking device, open-close type CT is appeared, but the ring type magnetic core of the CT is required to be designed according to the size of a corresponding cable, the CT cannot be suitable for cables with different voltage levels, the universality of the energy taking device is reduced, the energy supply cannot be rapidly installed, meanwhile, the open-close type magnetic core is formed by combining an upper magnetic core and a lower magnetic core, the magnetic cores are easy to displace when sealant is poured, and the problems that the magnetic cores are asymmetrical and mistakenly touched when the equipment is closed are caused.
At present, technicians gradually research non-closed type CT, the non-closed type CT in the conventional technology can be suitable for cables with different voltage levels and different sizes, and can avoid the problem of mistaken touch caused by the closed type CT, but still has great limitation, when the size specification of the cable is too large in the specification difference from the non-closed type CT, the energy taking power can be greatly reduced or even can not be used, and therefore the existing non-closed type CT can not meet the requirement of high universality.
The inventor has noticed that if an energy obtaining device can be designed to be placed on one side of a cable for induction use, the universality can be greatly improved without being affected by factors such as the diameter size and specification of the cable, but in the conventional technology, the problem that the universality and the high power of the induction energy obtaining device are difficult to achieve simultaneously is still urgently needed to be solved because the energy obtaining power is greatly reduced and is not paid to the contrary because a rectangular coil and a magnetic core are placed on one side of the cable for energy obtaining.
Aiming at the problem that universality and high power are difficult to obtain, in order to enable a unilateral energy-taking device to have high power, the inventor does a dilemma to overcome the problem, the design of a core device magnetic core and a coil of a current transformer is researched, through thinking and experiments, the inventor discovers that after the relative permeability of materials of thin cylindrical magnetic cores is determined, the effective permeability is related to the length of the magnetic core and related to the diameters and the areas of two ends of the magnetic core, the more the effective permeability of the slender magnetic core is, the larger the diameters of the two ends are and the larger the area is, the more the effective permeability is, based on the above consideration, the inventor adopts a plurality of thin cylindrical magnetic cores to replace a common integral cuboid magnetic core, so that the length of the magnetic core group can be adjusted and increased, part of the thin cylindrical magnetic cores are provided with an increased top structure, the magnetic core group with high effective permeability is obtained to improve the power density, careful finding is carried out through simulation experiments, and an extended simulation experiment is carried out on the increased top structures with different shapes, and finally the unilateral energy-taking device for the cable capable of being arranged on the unilateral cable is obtained, the unilateral energy-taking device capable of meeting the requirements of low-consumption sensors and the like, and the better effect is obtained after the unilateral energy-taking device is put into use.
The cable unilateral that sets up like this can the device, and the input in-service use can be applicable to the cable of arbitrary size and specification, only need install in cable one side can, solved and got can the device and compatible problem of different voltage classes and cable diameter adaptation, reach that the universality is high, the installation is convenient, can also keep higher output's effect simultaneously.
Referring to fig. 1, fig. 1 illustrates a schematic diagram of a cable one-sided energy extraction device 10 according to some embodiments of the present application.
The application provides an energy device 10 is got to cable unilateral, establish the outside coil 120 of magnetic core group 110 including magnetic core group 110 and cover, the unilateral of cable 30 is arranged in to magnetic core group 110, the both ends of magnetic core group 110 are provided with and increase board 1100, magnetic core group 110 includes a plurality of magnetic core monomers, a plurality of magnetic core monomer parallel arrangement and contact each other, a plurality of magnetic core monomers can relative movement on its length direction, thereby change the length of magnetic core group 110, the magnetic core monomer is provided with the tip that increases board 1100 and is greater than the free radial dimension of magnetic core along the free radial size of magnetic core.
It is understood that the radial direction of the single magnetic core body refers to the radial direction of a circular cross section or an elliptical cross section of the single magnetic core body along the length direction, or the radial direction of a circumscribed ellipse or a circumscribed circle of other cross sections of the single magnetic core body along the length direction.
The cable single-side energy taking device 10 provided by the invention comprises a magnetic core group 110 and a coil 120, wherein the coil 120 is sleeved outside the magnetic core group 110, the magnetic core group 110 comprises a plurality of electric core monomers which are arranged in parallel and are in contact with each other, the magnetic core monomers are moved along the length direction of the magnetic core monomers, so that the effective length of the magnetic core group 110 is increased, the magnetic conductivity is improved, in addition, the two ends of the magnetic core group 110 are increased along the radial dimension of the magnetic core monomers by arranging the enlarging plates 1100 at the two ends of the magnetic core group 110, the magnetic conductivity is further improved, and the output power of the cable single-side energy taking device 10 is obviously improved. The cable unilateral energy taking device 10 is arranged on one side of the cable 30 when in use, the problem that the energy taking device is compatible with different voltage classes and the diameter adaptation of the cable 30 is solved, the universality is greatly improved, meanwhile, higher output power can be kept through the movable lengthened magnetic core group 110 and the enlarged plates 1100 positioned at two ends of the magnetic core group 110, and the cable unilateral energy taking device is a breakthrough of the traditional technology.
The coil 120 is sleeved outside the magnetic core group 110. In some embodiments, the coil 120 is made of pure copper wire, and the diameter and the number of turns of the coil can be adjusted according to specific requirements.
Specifically, enlarged plate 1100 is located outside of coil 120. Specifically, the coil 120 is wound so that the winding portion does not extend beyond the side of the enlarged plate 1100 facing the coil 120.
The magnetic core group 110 includes a plurality of magnetic core cells. Specifically, the magnetic core unit is a thin column type, which refers to a column structure with a height greater than the radial dimension of the bottom, for example, when the magnetic core unit is a cylinder, the height is greater than the diameter length of the bottom, when the magnetic core unit is a square cylinder, the height is greater than the side length of the bottom, and when the magnetic core unit is a triangular prism, the height is greater than the center line of the bottom.
In some embodiments, the material of the magnetic core assembly 110 is permalloy. For the thin cylindrical magnetic core single body, after the relative permeability is determined, the effective permeability is related to the length of the magnetic core single body, and the longer the magnetic core single body is, the larger the effective permeability is, and the magnetic density is increased. Adopt a plurality of thin column type magnetic core monomer to replace monoblock cuboid magnetic core commonly used, can obtain the higher magnetic core group 110 of effective magnetic conductivity.
The plurality of magnetic core single bodies are arranged in parallel and are in contact with each other, and the plurality of magnetic core single bodies can move relatively in the length direction of the magnetic core single bodies, so that the length of the magnetic core group 110 is changed, and the magnetic permeability of the magnetic core group 110 is increased along with the increase of the length of the magnetic core group. This application has adopted movable structural design, carries out relative displacement with a plurality of thin square column type magnetic core monomer along length direction, makes the whole lengthening of magnetic core group 110 to increase the magnetic core effective length, can obtain bigger magnetic density, specific regulation distance is confirmed according to the experimental result, in order to reach the biggest output effect.
In some embodiments, the lengths of the individual magnetic cores are adjusted and then fixed by heat-resistant glue, so as to avoid the individual magnetic cores from being undesirably displaced when the cable unilateral energy taking device 10 is installed.
In some embodiments, the magnetic core cells are configured as a first magnetic core 1110 and a second magnetic core 1120, and the enlarged plate 1100 is disposed at an end of the second magnetic core 1120. Preferably, enlarged plate 1100 covers the end surface of second core 1120, that is, enlarged plate 1100 covers the end of second core 1120, and the area of the bottom surface of enlarged plate 1100 is larger than the area of the end surface of second core 1120, thereby ensuring equivalent cross-sectional area and magnetic permeability. Further, the end face of the second magnetic core 1120 is located at the middle of the enlarged plate 1100, which is more reasonable in arrangement and relatively higher in magnetic permeability.
In some embodiments, first core 1110 and second core 1120 are at least partially disposed within coil 120. Specifically, when first core 1110 and second core 1120 move relative to each other, an effective contact area between first core 1110 and second core 1120 is ensured. The first core 1110 and the second core 1120 may not be entirely separated from the coil 120 to secure output power.
For the thin cylindrical magnetic core, after the relative magnetic permeability is determined, the effective magnetic permeability is related to the diameters of the two ends, the larger the diameters of the two ends are, the larger the effective magnetic permeability is, that is, the larger the radial size of the second magnetic core 1120 of the enlarging plate 1100 is, the larger the effective magnetic permeability of the magnetic core group 110 is, and the power density is further improved.
Referring to fig. 1 and 2, fig. 2 is a cross-sectional view of a cable single-side energy-harvesting device 10 along a radial direction of a core assembly 110 according to some embodiments of the present application. In some embodiments, first core 1110 and second core 1120 are cylinders or square columns. In some embodiments, enlarged plate 1100 is a cylinder or a square cylinder. In some embodiments, first core 1110 and second core 1120 may also be in the shape of hexagonal cylinders, and enlarged plate 1100 may be in the shape of hexagonal cylinders. In particular uses, the particular shapes of first core 1110, second core 1120, and oversized plate 1100 are not limited and can be selected as desired. In some embodiments, enlarged plate 1100 may have a different shape than first core 1110 and second core 1120, and may have an effect similar to that of enlarged plate 1100 having the same shape.
In some embodiments, the ports of the coil 120 are provided with capacitors, which are connected in series or in parallel with the coil 120. The self-inductance of the coil 120 is eliminated by adopting the resonance principle due to the reactance of the matched capacitor matching coil 120, and the inductive power loss of the coil 120 is weakened to improve the energy taking efficiency.
Referring to fig. 3, fig. 3 shows a schematic usage diagram of some cable unilateral energy-taking devices 10 of the present application.
In some embodiments, the cable unilateral energy-taking device 10 is connected with the power management module 20, and the power management module 20 processes and outputs the energy obtained by the cable unilateral energy-taking device 10. The electric energy management module 20 rectifies, filters, stabilizes and the like the energy induced by the cable unilateral energy-taking device 10 directly from the cable 30 to obtain a stable and reliable direct current voltage, so as to provide a stable power supply for a load such as the sensor 40 installed nearby.
In the following embodiments of the present invention, an experiment of the cable unilateral energy-taking device 10 is performed under the condition that the cable 30 is powered on, taking a 110kV single-core XLPE cable environment as an example, and the XLPE cable is a cross-linked polyethylene cable and plays an extremely important role in a power supply grid. The diameter of the cable 30 is 105mm, and the main structure of the cable 30 is as follows from inside to outside: copper core, interior semiconductor shielding layer, XLPE insulating layer, outer semiconductor shielding layer, metal sheath, outer insulating sheath.
In an embodiment of the present invention, experiment 1 is performed, and the experimental objects of comparative group 1 are four pillar-shaped first cores 1110, four pillar-shaped second cores 1120, and coils 120, wherein the core material is permalloy having an initial relative permeability of fifty thousand, the first cores 1110 and the second cores 1120 are cylinders having a diameter of 8mm and a length of 150mm, and the coils 120 are copper wires having a wire diameter of 0.5mm and a number of turns of 3000.
The experimental objects of the comparison group 2 are four thin column type first magnetic cores 1110, four thin column type second magnetic cores 1120 and the coil 120, the magnetic core material adopts permalloy with the initial relative permeability of fifty thousand, the first magnetic cores 1110 and the second magnetic cores 1120 are cylinders with the diameter of 8mm and the length of 150mm, the coil 120 selects a copper wire with the wire diameter of 0.5mm and the number of turns of 3000, the displacement of the adjacent magnetic cores in the length direction is 40mm, and the whole length of the magnetic core group 110 after moving is 270mm.
The experimental objects of the experimental group 1 are four thin column type first magnetic cores 1110, four thin column type second magnetic cores 1120 and coils 120, the magnetic cores are made of permalloy with initial relative permeability of fifty thousand, the first magnetic cores 1110 and the second magnetic cores 1120 are cylinders with diameters of 8mm and lengths of 150mm, the enlarged plate 1100 at the top of the second magnetic cores 1120 is a cylinder with a diameter of 16mm, the coils 120 are made of copper wires with a wire diameter of 0.5mm and a number of turns of 3000, the displacement of the adjacent magnetic cores in the length direction is 40mm, the overall length of the magnetic core group 110 after moving is 270mm, and the structure after moving is shown in figure 1.
COMSOL is COMSOL from COMSOL corporation in Sweden
The software is a multi-physical field simulation software with strong functions for simulating engineering, manufacturing and scientific researchThe design, the equipment and the process in various fields are verified through COMSOL simulation experiments, in the experiment 1, the output power of the experiment group 1 is improved by 85% compared with the output power of a comparison group 1 without a moving structure of a magnetic core and without an enlarged plate 1100 structure, the output power of the experiment 1 is improved by more than 45% compared with the output power of a comparison group 2 without an enlarged plate 1100 structure, and the output power is improved along with the increase of the size of the enlarged plate 1100.
In order to increase the output power, a capacitor is configured at the port of the coil 120, the self-inductance of the coil 120 is eliminated through the resonance principle, and the matched capacitance value is related to the coil 120. In the experimental group 1, the reactance of the coil 120 is about 260 Ω, and the matching series capacitance is 12.37 μ F, and the parallel matching capacitance is 12.19 μ F. Through simulation experiments, under the condition that the cable 30 is through-current 200A, the output power of the cable unilateral energy-taking device 10 through the electric energy management module 20 is about 60mW in the experimental group 1, and a practical effect is achieved.
In another embodiment of the present invention, experiment 2 was conducted, and the experimental subjects of comparative group 3 were four pillar-shaped first cores 1110, four pillar-shaped second cores 1120, and coils 120, wherein permalloy having an initial relative permeability of fifty thousand was used as the core material, the first cores 1110 and the second cores 1120 were square pillars having a side length of 8mm and a length of 150mm, and copper wires having a wire diameter of 0.5mm and a number of turns of 3000 were selected for the coils 120.
The experimental objects of the comparison group 4 are four thin column type first magnetic cores 1110, four thin column type second magnetic cores 1120 and the coil 120, the magnetic core material adopts permalloy with the initial relative permeability of fifty thousand, the first magnetic cores 1110 and the second magnetic cores 1120 are square columns with the side length of 8mm and the length of 150mm, the coil 120 selects a copper wire with the wire diameter of 0.5mm and the number of turns of 3000, the displacement of the adjacent magnetic cores in the length direction is 40mm, and the whole length of the magnetic core group 110 after moving is 270mm.
The experimental objects of the experimental group 2 are four thin-column-shaped first magnetic cores 1110, four thin-column-shaped second magnetic cores 1120 and the coil 120, permalloy with an initial relative magnetic permeability of fifty thousand is adopted as the magnetic core material, the first magnetic cores 1110 and the second magnetic cores 1120 are square columns with the side length of 8mm and the length of 150mm, the enlarged plate 1100 at the top of the second magnetic core 1120 is a square column with the side length of 16mm, the coil 120 is made of copper wire with the wire diameter of 0.5mm and the number of turns of 3000, the displacement of the adjacent magnetic cores in the length direction is 40mm, and the whole length of the magnetic core group 110 after moving is 270mm.
Through COMSOL simulation experiment verification, in experiment 2, the output power of experiment group 2 has been promoted 85% compared with the output power of comparison group 3 that does not have the magnetic core to move the structure and does not have enlarged board 1100 structure, and the output power of experiment 2 has been promoted more than 40% compared with the output power of comparison group 4 that does not have the enlarged board 1100 structure, and output power increases along with the increase in size of enlarging board 1100.
In order to increase the output power, a capacitor is configured at the port of the coil 120, the self-inductance of the coil 120 is eliminated through the resonance principle, and the matched capacitance value is related to the coil 120. In the experimental group 2, the reactance of the coil 120 is about 260 Ω, and the matching series capacitance is 12.37 μ F and the parallel matching capacitance is 12.19 μ F. Through simulation experiments, under the condition that the cable 30 is through-current 200A, the output power of the cable unilateral energy-taking device 10 through the electric energy management module 20 is about 60mW, so that the practical effect is achieved.
Analyzing the above experiments 1 and 2, it can be known that the structure of the first magnetic core 1110 and the second magnetic core 1120 in the present application, which are cylindrical or square-column shaped, all have a good power-increasing effect.
When the movable thin column type magnetic core is adopted and the length of the magnetic core group 110 is increased in a moving mode, the output power is improved by 80% -85% compared with that of comparison groups 1 and 3 without structures of the movable thin column type magnetic core and an increasing plate 1100; on the basis, when the enlarged plate 1100 structure is arranged at the end part of the second magnetic core 1120, the output power is improved by 40-45% compared with the comparison groups 2 and 4 without the enlarged plate 1100 structure.
It can be seen that the cable unilateral energy-taking device 10 in the present application can be applied to cables 30 of different voltage classes and different diameters, and can improve the output power level, thereby solving the problem that universality and high power are difficult to achieve.
The cable single-side energy-taking device 10 provided by the invention comprises a magnetic core group 110 and a coil 120, wherein the magnetic core group 110 comprises a plurality of thin column-shaped first magnetic cores 1110 and second magnetic cores 1120 which are arranged in parallel and contacted with each other, one end of the second magnetic core 1120 is provided with an enlarged plate 1100, the first magnetic cores 1110 and the second magnetic cores 1120 can move relatively, and the coil 120 is sleeved outside the magnetic core group 110. When the cable unilateral energy-taking device 10 is used, the device is directly arranged on one side of the cable 30, so that the problem that the energy-taking device is difficult to adapt and compatible with cables 30 with different voltage classes and diameters is solved, and the universality is greatly improved; simultaneously through the inventor to the optimal design of magnetic core group 110 shape and size, adopt the monoblock cuboid magnetic core that a plurality of thin column type magnetic core monomer replaced commonly used, improve effective permeability, it makes the whole lengthening of magnetic core group 110 to move the free relative position of magnetic core along length direction, improve effective permeability once more, and set up at the tip of second magnetic core 1120 and increase board 1100, further promote the effective permeability of magnetic core group 110, thereby improve the output and the power density of cable unilateral energy taking device 10, and eliminate coil 120 self-inductance through the resonance principle, promote output efficiency once more, verify output and obtain showing the promotion through the experiment. Finally, the cable unilateral energy-taking device 10 which greatly improves universality and keeps higher output power is obtained, and the method is a breakthrough of the traditional technology.
The cable unilateral energy taking device 10 with the structure can improve the power to the level which can be applied by the sensor 40, provides a quick and low-cost online energy taking mode for the sensor 40, is beneficial to large-scale deployment and application of the sensor 40 in the field of power monitoring, and provides a brand-new solution for the convenient, quick and low-cost induction energy taking of the sensor 40.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A cable unilateral energy-harvesting device (10), comprising:
the magnetic core group (110) is arranged on one side of the cable (30), two ends of the magnetic core group (110) are provided with enlarged plates (1100), the magnetic core group (110) comprises a plurality of magnetic core single bodies, the magnetic core single bodies are arranged in parallel and are in contact with each other, the magnetic core single bodies can move relatively in the length direction of the magnetic core group (110), so that the length of the magnetic core group (110) is changed, and the size of the end part of the magnetic core single body, provided with the enlarged plates (1100), along the radial direction of the magnetic core single body is larger than the radial size of the magnetic core single body;
the coil (120), the coil (120) cover is established outside the magnetic core group (110).
2. The cable unilateral energy harvesting device (10) of claim 1, wherein the enlarged plate (1100) is positioned outside of the coil (120).
3. The cable unilateral energy extraction device (10) of claim 2, wherein the magnetic core cells are configured as a first magnetic core (1110) and a second magnetic core (1120), and the enlarged plate (1100) is disposed at an end of the second magnetic core (1120).
4. The cable unilateral energy extraction device (10) of claim 3, wherein the enlarged plate (1100) covers an end face of the second magnetic core (1120).
5. The cable unilateral energy extraction device (10) of claim 4, wherein the end face of the second magnetic core (1120) is located in a middle portion of the enlarged plate (1100).
6. The cable unilateral energy extraction device (10) of claim 3, wherein the first magnetic core (1110) and the second magnetic core (1120) are cylindrical or square cylinders.
7. The cable unilateral energy extraction device (10) of claim 6, wherein the enlarged plate (1100) is a cylinder or a square cylinder.
8. The cable unilateral energy extraction device (10) of claim 3, wherein at least a portion of the first core (1110) and the second core (1120) are disposed within the coil (120).
9. The cable unilateral energy extraction device (10) of claim 1, wherein a port of the coil (120) is provided with a capacitance, the capacitance being connected in series or in parallel with the coil (120).
10. The cable unilateral energy extraction device (10) of claim 1, wherein the cable unilateral energy extraction device (10) is connected to a power management module (20), and the power management module (20) processes and outputs energy extracted by the cable unilateral energy extraction device (10).
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| CN117955257A (en) * | 2024-03-26 | 2024-04-30 | 国网上海市电力公司 | Method and system for adaptively controlling electromagnetic induction energy taking of power transmission wire |
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