Current sensor

Abstract

The utility model discloses a current sensor. The current sensor comprises a skeleton; the magnetic core is arranged in the framework, a detection channel is formed in the magnetic core, and the detection channel is used for allowing a transmission wire with current to be detected to penetrate through so that the transmission wire with the current can generate an induced magnetic field under the action of electromagnetic induction; the coil comprises a wire-removing wire turn and a wire-returning wire turn, and the wire-removing wire turn and the wire-returning wire turn are arranged in a crossed manner and are wound on the framework, so that the coil generates induced current under the action of an induced magnetic field; and the detection circuit is connected to the coil and is used for detecting the induction current generated by the coil. According to the technical scheme of the utility model, the problem that the measurement result of the current sensor of the wind power plant has errors due to the fact that the Rogowski coil is easily interfered by an external magnetic field during measurement in the background technology is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a current sensor. Background Art

[0002] In modern wind power generation systems, Rogowski coils are widely used as non-contact current sensors. However, Rogowski coils are sensitive to the surrounding electromagnetic environment, and in the presence of complex electromagnetic interference, they can cause errors in sensor measurement results. Because most wind farm collector lines utilize multiple circuits on the same tower, multiple lines share the same tower, increasing the complexity of the electromagnetic environment. Interactions between adjacent lines, electromagnetic radiation from the wind turbines themselves, lightning strikes, and other external factors all generate additional magnetic field interference, affecting the Rogowski coil's measurement accuracy and leading to errors in sensor measurements. Utility Model Content

[0003] The main purpose of the utility model is to provide a current sensor, aiming to solve the problem in the background art that the Rogowski coil is easily disturbed by the external magnetic field during measurement, resulting in errors in the current sensor measurement results of the wind farm.

[0004] To achieve the above object, the present invention provides a current sensor, comprising:

[0005] skeleton;

[0006] a magnetic core disposed within the frame, the magnetic core being formed with a detection channel, the detection channel being used for passing a transmission wire of a current to be measured, so that the transmission wire carrying the current generates an induced magnetic field under the action of electromagnetic induction;

[0007] a coil, the coil comprising a de-wired wire turn and a return wire turn, the de-wired wire turn and the return wire turn being arranged crosswise and wound around the frame, so that the coil generates an induced current under the action of an induced magnetic field; and

[0008] A detection circuit is connected to the coil and is used to detect the induced current generated by the coil.

[0009] Optionally, the current sensor includes at least three magnetic cores, which are stacked from the inside to the outside around the detection channel, so that the transmission wire carrying current generates an induced magnetic field under the action of electromagnetic induction.

[0010] Optionally, the skeleton includes a first skeleton and a second skeleton that are arranged opposite to each other, and the first skeleton and the second skeleton together form an installation space for the magnetic core, so that the magnetic core forms the detection channel.

[0011] Optionally, the magnetic core includes a first magnetic core and a second magnetic core that are spaced apart from each other, the first magnetic core is disposed in the first skeleton, and the second magnetic core is disposed in the second skeleton.

[0012] Optionally, the first skeleton is provided with three first magnetic cores stacked from the inside to the outside around the detection channel, and the second skeleton is provided with three second magnetic cores stacked from the inside to the outside around the detection channel. When the first skeleton and the second skeleton are assembled together, three layers of magnetic cores are formed around the detection channel.

[0013] Optionally, the three first magnetic cores are movably arranged on the first skeleton, and the three second magnetic cores are movably arranged on the second skeleton, and the air gaps of the three-layer magnetic cores formed by the three first magnetic cores and the three second magnetic cores are staggered.

[0014] Optionally, the skeleton includes a first insulating plate, a second insulating plate, a third insulating plate and a fourth insulating plate arranged at intervals around the detection channel for winding the coil, wherein the first insulating plate constitutes the boundary of the detection channel and the magnetic core is arranged between the first insulating plate and the second insulating plate.

[0015] Optionally, the de-wired turns are wound with a first insulating plate, a third insulating plate, and a fourth insulating plate, and the return wire turns are wound with a second insulating plate and a fourth insulating plate. The de-wired turns and the return wire turns are cross-arranged and wound around the skeleton so that the coil is affected by the induced magnetic field to generate an induced current.

[0016] Optionally, a plurality of small holes or grooves are provided on the first insulating plate, the second insulating plate, the third insulating plate and the fourth insulating plate for fixing and guiding the winding path of the coil.

[0017] Optionally, the coil turns are wound using enameled wire.

[0018] In the technical solution of the present invention, by arranging the magnetic core in the frame and forming a detection channel, the magnetic core can serve as a shielding layer, effectively blocking the external magnetic field and reducing the interference of the external magnetic field on the internal magnetic field; the coil includes a de-wired wire turn and a return wire turn, the de-wired wire turn and the return wire turn are arranged crosswise and wound around the frame, when the external magnetic field acts on the sensor, induced voltages of opposite directions are generated in the de-wired wire turn and the return wire turn, these voltages cancel each other in the final induced current, thereby reducing the interference of the external magnetic field. When the transmission wire of the current to be measured passes through the detection channel formed by the center of the magnetic core, according to the Ampere loop theorem, when the current flows in the wire, a magnetic field surrounding the wire is generated, and the de-wired wire turn and the return wire turn in the coil sense the change of this magnetic field, generating an induced current in the coil, and the detection circuit is connected to the coil to detect these induced currents and convert them into usable electrical signals for output. It can be understood that the technical solution of the present invention solves the problem that the Rogowski coil used in the current sensor of the wind farm in the background technology is easily interfered by the external magnetic field and causes measurement errors, thereby improving the anti-interference ability of the current sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of half of the skeleton of the current sensor according to one embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the three-layer magnetic core structure of a current sensor according to an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of the three-dimensional structure of the current sensor after it is opened according to one embodiment of the utility model;

[0023] Figure 4 This is a schematic diagram of the three-dimensional structure of the current sensor after being closed according to one embodiment of the utility model.

[0024] Description of Figure Numbers:

[0025] Label name Label name 1000 Current sensor 20 Detection channel 10 skeleton 30 magnetic core 11 The first skeleton 31 First magnetic core 12 Second skeleton 32 Second magnetic core 101 First insulating plate 33 air gap 102 Second insulating plate 40 Coil 103 The third insulating plate 41 Remove wire turns 104 Fourth insulating plate 42 Loop turns 105 Connecting plate 50 Detection circuit

[0026] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] In view of this, the main purpose of the present invention is to provide a current sensor, which aims to solve the problem in the background technology that the Rogowski coil measurement is easily interfered by the external magnetic field, resulting in errors in the current sensor measurement results of the wind farm, and improve the anti-interference ability of the current sensor.

[0031] See also Figures 1 to 4 As shown, in one embodiment of the present invention, a current sensor 1000 includes: a skeleton 10; a magnetic core 30, the magnetic core 30 is arranged in the skeleton 10, and the magnetic core 30 is formed with a detection channel 20, and the detection channel 20 is used for passing the transmission wire of the current to be measured, so that the transmission wire carrying the current generates an induced magnetic field under the action of electromagnetic induction; a coil 40, the coil 40 includes a wire-cutting turn 41 and a return wire turn 42, the wire-cutting turn 41 and the return wire turn 42 are cross-arranged and wound around the skeleton 10, so that the coil 40 generates an induced current under the action of the induced magnetic field; and a detection circuit 50, the detection circuit 50 is connected to the coil 40, and is used to detect the induced current generated by the coil 40.

[0032] In the technical solution of the present invention, the transmission wire of the current to be measured passes through the detection channel 20 at the center of the magnetic core 30. When the current flows through the wire, a magnetic field is generated, and the magnetic core 30 can serve as a shielding layer to effectively block the external magnetic field and reduce the interference of the external magnetic field on the internal magnetic field; the coil 40 includes a de-wired wire turn 41 and a return wire turn 42, and the de-wired wire turn 41 and the return wire turn 42 are cross-arranged and wound around the skeleton 10. When the external magnetic field acts on the current sensor, induced voltages in opposite directions will be generated in the de-wired wire turn 41 and the return wire turn 42. These voltages cancel each other out in the final induced current, thereby reducing the interference of the external magnetic field. When the transmission wire of the current to be measured passes through the detection channel 20 formed by the center of the magnetic core 30, according to Ampere's loop theorem, when the current flows in the wire, a magnetic field surrounding the wire will be generated. The outgoing wire turns 41 and the return wire turns 42 in the coil 40 sense the changes in this magnetic field, generating an induced current in the coil 40. The detection circuit 50 is connected to the coil 40, detecting these induced currents and converting them into usable electrical signal outputs, thereby realizing the detection of the current. It can be understood that the technical solution of the present utility model improves the anti-magnetic interference ability of the current sensor by providing a magnetic core 30 as a shielding layer, and the coils 40 wound on the skeleton 10 and arranged in an equidistant cross layout on the skeleton. Furthermore, since the magnetic core 30 has a gathering effect on the magnetic field around the wire to be measured, it can improve the ability of the sensor to couple weak magnetic field signals, thereby improving the sensitivity of the current sensor to detect small currents.

[0033] It should be noted that, in the embodiment of the present invention, the skeleton 10 is a circular skeleton, which provides a continuous circular path so that the magnetic field can be evenly distributed around the detection channel. According to the actual needs of the wind farm site, the skeleton can also be set as a square or rectangular skeleton, an elliptical skeleton or other polygonal skeletons and a deformable skeleton. The square or rectangular skeleton can provide a larger space to accommodate wires or other equipment components while maintaining the shielding effect of the magnetic field, which is suitable for application scenarios that require a larger detection channel or limited space. The elliptical skeleton can provide better space utilization, especially when the detection channel needs to have a certain aspect ratio, which helps to optimize the magnetic field distribution and improve the sensitivity of the sensor. The polygonal skeleton can provide different shape options to adapt to specific application requirements. For example, a hexagonal or polygonal skeleton can provide a larger detection channel space while ensuring magnetic field shielding. The deformable skeleton adjusts its shape as needed to adapt to different wire sizes or application requirements. For example, a part of the skeleton can be designed to be retractable or bendable to adapt to different installation conditions.

[0034] See also Figures 1 to 4As shown, in one embodiment of the present invention, the current sensor includes at least three magnetic cores 30, and the three magnetic cores 30 are stacked in sequence from the inside to the outside around the detection channel 20, so that the current to be measured generates an induced magnetic field under the action of electromagnetic induction. Specifically, the magnetic cores 30 are arranged in sequence from the inside to the outside to form a compact and efficient magnetic field concentration structure. This stacked arrangement helps to enhance the concentration of the magnetic field, thereby improving the induction efficiency. The innermost magnetic core is directly located near the detection channel and can capture the strongest magnetic field signal; the middle layer magnetic core plays the role of enhancing and conducting the magnetic field, and transmits the magnetic field signal to the outer layer magnetic core; the outermost magnetic core further enhances the magnetic field signal and acts as a shielding layer to reduce the interference of the external magnetic field. This structure can enhance the magnetic field signal and effectively reduce the interference of the external magnetic field on the internal magnetic field, thereby improving the accuracy and stability of current measurement.

[0035] See also Figures 1 to 4 As shown, in one embodiment of the present invention, the skeleton 10 includes a first skeleton 11 and a second skeleton 12 that are relatively arranged. The first skeleton 11 and the second skeleton 12 together form an installation space for the magnetic core 30, so that the magnetic core 30 forms a detection channel 20. Specifically, the first skeleton 101 and the second skeleton 102 are designed separately and can be independently manufactured and tested, and then assembled on site, thereby simplifying the manufacturing process and facilitating on-site installation and maintenance. The skeleton 10 is assembled from the first skeleton 101 and the second skeleton 102. When a problem occurs in one of the first skeleton 101 and the second skeleton 102, only the problematic component needs to be replaced, thereby reducing maintenance costs and time. The detection channel between the two skeletons can be adjusted according to different wire sizes, which increases the adaptability of the sensor.

[0036] It should be noted that, in the embodiment of the present invention, the first skeleton 11 and the second skeleton 12 are axially symmetrical to each other, and are distributed in a mirror-symmetrical manner relative to the central axis of the detection channel 20, thereby ensuring the symmetry and consistency of the magnetic field distribution, which is conducive to improving the accuracy and stability of the measurement. In addition to the axisymmetric design, an asymmetric design can also be considered for specific application scenarios. The shapes of the first skeleton 11 and the second skeleton 12 can be adjusted according to actual needs. The shapes of the two skeletons are different but can still meet the needs of forming a detection channel. In addition to a skeleton consisting of two parts, it can also be designed as a multi-segment skeleton, for example, divided into three or more parts, each part can be independently manufactured and assembled, thereby improving the flexibility and adaptability of the sensor. Furthermore, certain parts of the skeleton can be designed to be adjustable, so that the size or shape of the skeleton can be adjusted according to actual conditions, so as to better adapt to different application scenarios.

[0037] See also Figures 1 to 4As shown, in one embodiment of the present invention, the magnetic core 30 includes a first magnetic core 31 and a second magnetic core 32 that are spaced apart. The first magnetic core 31 is disposed in the first skeleton 11, and the second magnetic core 32 is disposed in the second skeleton 12. Specifically, by arranging the first magnetic core 31 and the second magnetic core 32 in the first skeleton 101 and the second skeleton 102, respectively, each magnetic core can work independently. Even if one of the magnetic cores is affected, the other magnetic core can still continue to provide shielding. Secondly, the layout in which the two magnetic cores are arranged separately helps to distribute the magnetic field more evenly around the detection channel, thereby making the overall performance of the sensor more stable and reducing interference from external magnetic fields. Furthermore, arranging the magnetic cores in two independent skeletons can reduce the mechanical stress caused by changes in the magnetic field during operation of the sensor, and the modular design of the magnetic cores makes it easy to replace or adjust the magnetic cores when necessary, reducing maintenance difficulty and cost.

[0038] See also Figures 1 to 4 As shown, in one embodiment of the present invention, the first skeleton 11 is provided with three first magnetic cores 31 stacked from the inside to the outside around the detection channel 20, and the second skeleton 12 is provided with three second magnetic cores 32 stacked from the inside to the outside around the detection channel 20. When the first skeleton 11 and the second skeleton 12 are assembled together, three layers of magnetic cores 30 are formed around the detection channel 20. Specifically, by respectively arranging three layers of magnetic cores in the first skeleton 11 and the second skeleton 12, the magnetic field generated by the current to be measured can be significantly enhanced, and the external magnetic field can be better shielded, thereby reducing external magnetic field interference. The layout of the six-layer magnetic core helps to optimize the magnetic field distribution and ensure that the magnetic field is concentrated around the detection channel 20. The six layers of magnetic cores work together to form a more effective shielding layer, reducing the impact of external electromagnetic interference on the measurement results.

[0039] It should be noted that the use of multiple layers of magnetic cores helps to increase the concentration of the magnetic field, thereby improving the sensor's sensitivity to current changes and measurement accuracy. By adjusting the position and number of the magnetic cores, the magnetic field shielding effect can be further optimized and the anti-interference ability can be improved. The position and number of the magnetic cores in the embodiment of the utility model can be set according to actual needs. The multiple magnetic cores can be stacked in order from small to large around the detection channel 20, or they can be spaced apart in the extension direction of the detection channel 20. More magnetic core layers can be added according to actual needs to further improve the sensor's magnetic anti-interference ability and scalability.

[0040] See also Figures 1 to 4As shown, in one embodiment of the present invention, three first magnetic cores 31 are movably arranged on the first skeleton 11, and three second magnetic cores 32 are movably arranged on the second skeleton 12. The air gaps 33 of the three-layer magnetic core formed by the three layers of first magnetic cores 31 and the three layers of second magnetic cores 32 are staggered. Specifically, by arranging three layers of magnetic cores on the two skeletons, a more effective shielding layer can be formed to reduce external electromagnetic interference. In the embodiment of the present invention, a sliding mechanism, a rotating mechanism and a manual adjustment mechanism can be set on the skeleton to adjust the position of the magnetic core. For example, a slide groove or a slide rail can be designed on the skeleton so that the magnetic core can move smoothly in the slide groove or the slide rail to adjust the position of the magnetic core; the magnetic core can be designed to be a rotatable structure, and the position of the air gap can be adjusted by rotating the magnetic core; a manual adjustment mechanism such as a pick can also be set on the magnetic core, and the operator can directly adjust the position of the magnetic core to adapt to different wire sizes or installation conditions. When the three first magnetic cores 31 are combined with the three second magnetic cores 32, an air gap 33 is formed in the middle. The position of the magnetic core is adjusted by a sliding mechanism, a rotating mechanism or a manual adjustment mechanism, and the air gaps 33 of the three layers of magnetic cores are staggered. The staggered air gaps require the magnetic flux to pass through a longer path and more turns when passing through the magnetic core. This tortuous magnetic flux path increases the magnetic resistance, thereby reducing the direct leakage of the magnetic flux, helping to enhance the shielding effect of the magnetic field and reduce the interference of the external magnetic field on the internal magnetic field.

[0041] See also Figures 1 to 4As shown, in one embodiment of the present invention, the skeleton 10 includes a first insulating plate 101, a second insulating plate 102, a third insulating plate 103, and a fourth insulating plate 104, which are spaced apart around the detection channel 20 and are used to wind the coil 40, wherein the first insulating plate 101 constitutes the boundary of the detection channel 20, and the magnetic core 30 is provided between the first insulating plate 101 and the second insulating plate 102. In this embodiment of the utility model, the magnetic core 30 is embedded between the first insulating plate 101 and the second insulating plate 102, and is tightly fitted with the first insulating plate 101 and the second insulating plate 102. The tight fit helps to form a more effective shielding layer, reduce the interference of the external magnetic field on the internal magnetic field, and help to optimize the magnetic field distribution, ensuring that the magnetic field is more evenly distributed around the detection channel 20. The tight fit of the magnetic core 30 with the first insulating plate 101 and the second insulating plate 102 can reduce magnetic flux leakage, further enhance the shielding effect of the magnetic field, and reduce the interference of the external magnetic field on the internal magnetic field. The second insulating plate 102, the third insulating plate 103 and the fourth insulating plate 104 are fixed by a connecting plate 105. The design of the connecting plate 105 makes it easier to disassemble and replace when a certain insulating plate needs to be replaced, reducing maintenance costs and time. At the same time, the connecting plate 105 enhances the rigidity of the entire skeleton structure, making the sensor more stable when facing external shocks or vibrations. In the embodiment of the present invention, the shape of the insulating plate is a cylindrical surface, which ultimately forms a closed annular structure. This design can better optimize the magnetic field distribution and ensure that the magnetic field is more evenly distributed around the detection channel 20. It can be understood that the sensor can adjust the shape of the insulating plate according to different needs, such as an elliptical surface, a rectangular surface, a fan-shaped surface, etc.; in addition to the basic four-sided insulating plate, more insulating plates can be added according to actual needs to form a more complex annular structure. More insulating plates can enhance the rigidity of the entire skeleton structure and improve the structural stability of the sensor.

[0042] See also Figures 1 to 4 As shown, in one embodiment of the present invention, the de-wired turns 41 are wound with the first insulating plate 101, the third insulating plate 103, and the fourth insulating plate 104, and the return turns 41 are wound with the second insulating plate 102 and the fourth insulating plate 104. The de-wired turns 41 and the return turns 42 are arranged crosswise and wound around the skeleton 10, so that the coil 40 generates an induced current under the action of the induced magnetic field. When an external magnetic field acts on the current sensor, induced voltages in opposite directions are generated in the de-wired turns 41 and the return turns 42. These voltages cancel each other in the final induced current, thereby reducing the interference of the external magnetic field. It should be noted that the embodiment of the present invention provides a specific winding path for the coil turns, but there is not only one winding path. As long as the de-wired turns 41 and the return turns 42 are arranged crosswise, the preferred layout is to form an equidistant cross layout on the side of the fourth insulating plate 104.

[0043] See also Figures 1 to 4 As shown, in one embodiment of the present invention, a plurality of small holes or grooves are provided on the first insulating plate 101, the second insulating plate 102, the third insulating plate 103 and the fourth insulating plate 104 for fixing and guiding the winding path of the coil 40. By providing a plurality of small holes or grooves on the four insulating plates, the position of the coil 40 can be fixed to ensure that the coil 40 does not move or become loose during the operation of the sensor, and helps to reduce the deformation of the coil 40 caused by mechanical stress during long-term use. The design of the small holes or grooves makes the winding path of the coil 40 more precise and controllable, helps to optimize the magnetic field distribution, and ensures that the magnetic field is more evenly distributed around the detection channel. By precisely controlling the position of the coil, the interference of the external magnetic field on the internal magnetic field can be further reduced, thereby improving the anti-interference ability of the sensor.

[0044] See also Figures 1 to 4 As shown, in one embodiment of the present invention, the coil 40 is wound with enameled wire. The surface of the enameled wire has a layer of insulating paint film, which can improve the insulation performance of the coil 40, reduce the risk of electrical short circuit between the coils, reduce the impact of external electromagnetic fields on the coils, and improve the anti-interference ability of the sensor. By using enameled wire to wind the coil 40, not only can the insulation performance, heat resistance and mechanical strength of the coil be improved, but also the magnetic field distribution can be optimized, and the anti-interference ability and measurement accuracy of the sensor can be improved. In addition, the cost-effectiveness and easy processing characteristics of the enameled wire help to reduce production costs and improve the durability and reliability of the sensor. This design is particularly suitable for complex electromagnetic environments that require high-precision current measurement, such as wind power stations and other application scenarios.

[0045] The above are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A current sensor, characterized in that: include: skeleton; a magnetic core disposed within the frame, the magnetic core being formed with a detection channel, the detection channel being used for passing a transmission wire of a current to be measured, so that the transmission wire carrying the current generates an induced magnetic field under the action of electromagnetic induction; A coil, the coil comprising a de-wired wire turn and a return wire turn, the de-wired wire turn and the return wire turn being arranged crosswise and wound around the frame, so that the coil generates an induced current under the action of an induced magnetic field; as well as A detection circuit is connected to the coil and is used to detect the induced current generated by the coil.

2. The current sensor according to claim 1, wherein The current sensor includes at least three magnetic cores, which are stacked from the inside to the outside around the detection channel so that the transmission wire carrying current generates an induced magnetic field under the action of electromagnetic induction.

3. The current sensor according to claim 1, wherein The skeleton includes a first skeleton and a second skeleton that are arranged opposite to each other. The first skeleton and the second skeleton together form an installation space for the magnetic core, so that the magnetic core forms the detection channel.

4. The current sensor according to claim 3, wherein: The magnetic core includes a first magnetic core and a second magnetic core that are spaced apart from each other. The first magnetic core is disposed in the first frame, and the second magnetic core is disposed in the second frame.

5. The current sensor according to claim 4, wherein: The first skeleton is provided with three first magnetic cores stacked from the inside to the outside around the detection channel, and the second skeleton is provided with three second magnetic cores stacked from the inside to the outside around the detection channel. When the first skeleton and the second skeleton are assembled together, three layers of magnetic cores are formed around the detection channel.

6. The current sensor according to claim 5, wherein: The three first magnetic cores are movably arranged on the first skeleton, and the three second magnetic cores are movably arranged on the second skeleton. The air gaps of the three-layer magnetic cores formed by the three first magnetic cores and the three second magnetic cores are staggered.

7. The current sensor according to any one of claims 1 to 6, characterized in that: The skeleton includes a first insulating plate, a second insulating plate, a third insulating plate and a fourth insulating plate arranged at intervals around the detection channel, for winding the coil, wherein the first insulating plate constitutes the boundary of the detection channel, and the magnetic core is arranged between the first insulating plate and the second insulating plate.

8. The current sensor according to claim 7, wherein: The de-wired turns are wound with the first insulating plate, the third insulating plate, and the fourth insulating plate, and the return wire turns are wound with the second insulating plate and the fourth insulating plate. The de-wired turns and the return wire turns are cross-arranged and wound around the skeleton so that the coil generates an induced current under the action of the induced magnetic field.

9. The current sensor according to claim 8, wherein: A plurality of small holes or grooves are provided on the first insulating plate, the second insulating plate, the third insulating plate and the fourth insulating plate for fixing and guiding the winding path of the coil.

10. The current sensor according to any one of claims 1 to 6, wherein: The coil turns are wound with enameled wire.

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