Current transformer for suppressing electromagnetic interference by adopting high-frequency magnetic ring method

Abstract

The invention relates to the technical field of current transformers, in particular to a current transformer for suppressing electromagnetic interference by adopting a high-frequency magnetic ring method. A housing; the number of the ports is two, and the two ports are fixedly connected and penetrate through the shell. The coil is fixedly connected to the interior of the shell; the number of the main magnetic rings is two, and the two main magnetic rings are fixedly connected to the interior of the shell and distributed on the two sides of the coil respectively; the fixing frame is fixedly connected to the interior of the shell, the fixing frame is in sliding connection with a plurality of sliding frames, each sliding frame is fixedly connected with two auxiliary magnetic rings, and the auxiliary magnetic rings are attached to the adjacent main magnetic rings; the stabilizing assembly is arranged in the shell; and the driving assembly is arranged in the shell. By changing the attaching position of the auxiliary magnetic ring and the main magnetic ring, the side, close to an external electric appliance element, of the main magnetic ring is superposed with the auxiliary magnetic ring, the resistance to an external interference magnetic field is improved, and the current detection precision of the device is improved.

Description

Technical Field

[0001] The invention relates to the technical field of current transformers, and in particular to a current transformer which adopts a high-frequency magnetic ring method to suppress electromagnetic interference. Background Art

[0002] A current transformer is a device used to measure and protect current in a circuit. It converts large current into small current so that measuring instruments and protection devices can work safely and accurately. The current transformer works based on the principle of electromagnetic induction. When a large current passes through the primary winding, a magnetic field is generated. This magnetic field induces a small current in the secondary winding. The turns ratio of the primary winding and the secondary winding determines the current conversion ratio, which converts the large current in the measuring cable into a small current. Most of the existing current transformers are installed in the distribution cabinet to measure various data of the distribution cabinet. However, due to the presence of a large number of electrical components in the distribution cabinet, these electrical components will generate a magnetic field to interfere with the current transformer. The existing current transformer places magnetic rings on both sides of the coil to resist external electromagnetic interference. However, in the distribution cabinet, some high-power electrical components generate high-frequency electromagnetic interference when the switch is closed or the system is short-circuited. This high-frequency electromagnetic interference has the characteristics of high frequency, steep wave front, and high amplitude. Simple magnetic rings cannot effectively resist such electromagnetic interference, which in turn harms winding equipment such as current transformers and reduces the measurement accuracy of the transformer. Summary of the invention

[0003] In order to overcome the shortcomings mentioned in the above background technology, the present invention provides a current transformer that uses a high-frequency magnetic ring method to suppress electromagnetic interference.

[0004] Technical solution: A current transformer that uses a high-frequency magnetic ring method to suppress electromagnetic interference, including: shell; There are two ports, both of which are fixedly connected and penetrate the housing; A coil, fixedly connected to the interior of the housing; There are two main magnetic rings, both of which are fixedly connected to the inside of the shell and are respectively distributed on both sides of the coil; A fixed frame, fixedly connected to the inside of the shell, the fixed frame is slidably connected to a plurality of sliding frames, the sliding frames are fixedly connected to two auxiliary magnetic rings, and the auxiliary magnetic rings are fitted with the adjacent main magnetic rings; A stabilizing component, disposed in the housing, for stabilizing the conversion current of the coil; The driving assembly is arranged in the shell and is used to change the fitting position of the auxiliary magnetic ring and the main magnetic ring.

[0005] As a preferred technical solution of the present invention, the stabilizing component includes: A stabilizing magnetic ring, fixedly connected to the interior of the housing; The winding wires include two winding wires, which are wound around and symmetrically distributed on the stable magnetic ring. One end of the two winding wires is electrically connected to the two ends of the cable on the coil, and the other end of the two winding wires is electrically connected to the two ports.

[0006] As a preferred technical solution of the present invention, the inner diameter of the coil is smaller than the inner diameter of the main magnetic ring, and the outer diameter of the coil is larger than the outer diameter of the main magnetic ring.

[0007] As a preferred technical solution of the present invention, the exterior of the auxiliary magnetic ring is a continuous wavy arc surface, and continuous arc surfaces are provided on both sides of the auxiliary magnetic ring.

[0008] As a preferred technical solution of the present invention, the crest of the external wavy arc surface of the auxiliary magnetic ring gradually decreases in height from the middle to both ends, so as to continuously change the magnetic field intensity.

[0009] As a preferred technical solution of the present invention, the driving assembly includes: An adjusting shaft is slidably and rotatably connected to the housing, and the adjusting shaft passes through the housing; An outer ring is fixedly connected to the interior of the housing, and the adjusting shaft is sealingly and slidably connected to the outer ring; The inner ring is sealingly rotatably connected to the inner part of the outer ring, and the two cooperate to form a closed cavity; The pushing component is arranged on the adjusting shaft and is used for driving the plurality of sliding frames to slide around the fixing frame.

[0010] As a preferred technical solution of the present invention, the pushing component includes: A piston shaft is sealingly and slidably connected in the inner ring, the piston shaft is in contact with the sliding frame, and a first elastic element is arranged between the piston shaft and the inner ring; A gear, fixedly connected to the adjusting shaft and located inside the housing; A gear ring is fixedly connected to the inner ring, and the gear is meshed with the gear ring.

[0011] As a preferred technical solution of the present invention, the thickness of the gear ring is greater than the thickness of the gear, so that the two are always in a docking state.

[0012] As a preferred technical solution of the present invention, it also includes: A locking assembly is disposed on the fixing frame and is used to lock all the sliding frames to the fixing frame. The locking assembly includes: The limiting blocks are the same in number as the sliding frames, and are respectively slidably connected to the adjacent sliding frames. The fixed frame is provided with circumferentially distributed limiting grooves, and the limiting blocks are limitedly matched with the limiting grooves; The second elastic elements are multiple of the number of the sliding frames and are respectively arranged between adjacent limit blocks and adjacent sliding frames; The reset components, which are the same in number as the sliding frames, are respectively arranged on adjacent sliding frames and are used to release the limiting of adjacent limiting blocks and limiting grooves.

[0013] As a preferred technical solution of the present invention, the reset component includes: There are two trigger plates, which are slidably connected to two sides of the sliding frame respectively; Extrusion blocks, the number of which is the same as the trigger plates, fixedly connected to adjacent trigger plates; The pushing block is fixedly connected to the limiting block, and the two extrusion blocks are extrusion-matched with the adjacent pushing blocks.

[0014] Beneficial effects: 1. By changing the fitting position of the secondary magnetic ring and the main magnetic ring, the side of the main magnetic ring close to the external electrical component forms a superposition state with the secondary magnetic ring, thereby increasing the ability to resist external interference magnetic fields and improving the current detection accuracy of the device.

[0015] 2. The secondary magnetic ring concentrates and guides the magnetic field strength, disperses the external magnetic field strength, reduces the penetration depth of the external magnetic field, and makes the change of the magnetic field path smoother, reduces the mutation effect of the magnetic field, thereby improving the uniformity and stability of the magnetic field, and further increasing the ability to resist external magnetic field interference.

[0016] 3. The high-frequency electromagnetic signals on the coil input and output lines are absorbed by the stable magnetic ring. At the same time, the two windings and the stable magnetic ring form two inductors that can be used as filter inductors to further absorb high-frequency electromagnetic signals, thereby improving the detection accuracy of the device.

[0017] 4. The sliding frame and the fixed frame are locked to each other to avoid vibration caused by the operation of the electrical components in the distribution cabinet, which causes the sliding frame to move relative to the fixed frame, resulting in the change of the fitting position of the secondary magnetic ring and the main magnetic ring, thereby reducing the detection accuracy of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic cross-sectional view of the three-dimensional structure of the housing of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the adjusting shaft and the outer ring of the present invention; Figure 4It is a schematic cross-sectional view of the three-dimensional structure of the outer ring and the inner ring of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the piston shaft of the present invention; Figure 6 is a schematic diagram of the three-dimensional structure of the second elastic element and the trigger plate of the present invention; Figure 7 It is a schematic cross-sectional view of the three-dimensional structure of the sliding frame of the present invention.

[0019] Marked in the figure: 1-housing, 2-port, 3-coil, 4-main magnetic ring, 5-fixed frame, 6-sliding frame, 7-auxiliary magnetic ring, 8-stabilizing magnetic ring, 9-winding, 201-adjusting shaft, 202-outer ring, 203-inner ring, 204-piston shaft, 205-first elastic element, 206-gear, 207-gear ring, 301-limiting block, 302-limiting groove, 303-second elastic element, 304-trigger plate, 305-extrusion block, 306-pushing block. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope and application scope of the present invention are not limited.

[0021] Existing current transformers resist external electromagnetic interference by placing magnetic rings on both sides of the winding. However, in the distribution cabinet, some high-power electrical components will generate high-frequency electromagnetic interference during switch opening and closing operations, system short circuits, etc. This high-frequency electromagnetic interference has the characteristics of high frequency, steep wave front, and high amplitude. Simple magnetic rings cannot effectively resist this type of electromagnetic interference, thereby causing damage to winding equipment such as current transformers and reducing the measurement accuracy of the transformer.

[0022] A current transformer that uses a high-frequency magnetic ring method to suppress electromagnetic interference, such as Figure 1-Figure 4 As shown, it includes: a shell 1; two ports 2, both of which are fixedly connected and penetrate the shell 1; a coil 3, which is fixedly connected to the inside of the shell 1; two main magnetic rings 4, both of which are fixedly connected to the inside of the shell 1 and are respectively distributed on both sides of the coil 3; a fixed frame 5, which is fixedly connected to the inside of the shell 1, and the fixed frame 5 is slidably connected to a plurality of sliding frames 6, and the sliding frames 6 are fixedly connected to two secondary magnetic rings 7, and the secondary magnetic rings 7 are fitted with the adjacent main magnetic rings 4; a stabilizing component, which is arranged in the shell 1 and is used to stabilize the conversion current of the coil 3; a driving component, which is arranged in the shell 1 and is used to change the fitting position of the secondary magnetic ring 7 and the main magnetic ring 4; the inner diameter of the coil 3 is smaller than the inner diameter of the main magnetic ring 4, and the outer diameter of the coil 3 is larger than the outer diameter of the main magnetic ring 4; the outer part of the secondary magnetic ring 7 is a continuous wavy arc surface, and continuous arc surfaces are arranged on both sides of the secondary magnetic ring 7; the wave crest of the external wavy arc surface of the secondary magnetic ring 7 gradually decreases from the middle to the two ends, so as to continuously change the magnetic field intensity.

[0023] In the above scheme, the shell 1 is made of transparent insulating material, which is convenient for the staff to observe the position of the internal auxiliary magnetic ring 7. At the same time, the shell 1 is filled with insulating gas to prevent arc discharge and short circuit. The insulating gas can be sulfur hexafluoride, nitrogen and carbon dioxide. The number of electric coils wound on the coil 3 is an integer multiple of 10, which is convenient for the detection and calculation of electrorheology. The material of the main magnetic ring 4 and the auxiliary magnetic ring 7 is a magnetic material with high magnetic permeability, good high-frequency characteristics and not easy to saturate, such as ferrite magnetic rings. The material of the fixed frame 5 and the sliding frame 6 are both lightweight insulating materials, which are used to avoid current leakage and reduce the weight of the device, reduce the load when the device is fixed, and slide. The number of movable frames 6 can be changed accordingly according to actual conditions, thereby improving the detection accuracy of the device. The inner diameter of the coil 3 is smaller than the inner diameter of the main magnetic ring 4, and the outer diameter of the coil 3 is larger than the outer diameter of the main magnetic ring 4, so that the magnetic field lines generated by the coil 3 cover the two main magnetic rings 4, which is convenient for the main magnetic ring 4 to increase the magnetic field strength of the coil 3. By changing the fitting position of the secondary magnetic ring 7 and the main magnetic ring 4, the side of the main magnetic ring 4 close to the external electrical component forms a superposition state with the secondary magnetic ring 7 (the secondary magnetic ring 7 is located between the electrical component and the main magnetic ring 4, and the thickness of the main magnetic ring 4 is increased), thereby increasing the ability to resist external interference magnetic fields and improving the detection accuracy of the current of the device.

[0024] Specifically, Figure 2 As shown, the stabilizing component includes: a stabilizing magnetic ring 8, which is fixedly connected to the inside of the housing 1; two windings 9, which are wound around and symmetrically distributed on the stabilizing magnetic ring 8, one end of the two windings 9 is electrically connected to the two ends of the cable on the coil 3, and the other end of the two windings 9 is electrically connected to the two ports 2.

[0025] In the above scheme, the material of the stabilizing magnetic ring 8 is the same as that of the main magnetic ring 4, the two windings 9 are two independent coils with the same number of turns and winding method, and the wires on the coil 3 and the windings 9 are both enameled wires, which have high insulation and conductivity, high mechanical strength and corrosion resistance.

[0026] Specifically, Figure 2-Figure 5 As shown, the driving component includes: an adjusting shaft 201, which is slidably and rotatably connected to the outer shell 1, and the adjusting shaft 201 passes through the outer shell 1; an outer ring 202, which is fixedly connected to the inside of the outer shell 1, and the adjusting shaft 201 and the outer ring 202 are sealed and slidably connected; an inner ring 203, which is sealed and rotatably connected to the inside of the outer ring 202, and the two cooperate to form a closed cavity; a pushing component, which is arranged on the adjusting shaft 201, and is used to drive a plurality of sliding frames 6 to slide around the fixed frame 5.

[0027] In the above scheme, the material of the adjustment shaft 201 is an insulating lightweight material to avoid current leakage. The closed cavity formed by the outer ring 202 and the inner ring 203 is filled with hydraulic oil to increase the heat dissipation rate inside the device.

[0028] Specifically, Figure 2-Figure 5 As shown, the pushing assembly includes: a piston shaft 204, which is sealingly and slidably connected in the inner ring 203, the piston shaft 204 is in contact with the sliding frame 6, and a first elastic element 205 is arranged between the piston shaft 204 and the inner ring 203; a gear 206, which is fixedly connected to the adjusting shaft 201 and is located inside the housing 1; a gear ring 207, which is fixedly connected to the inner ring 203, and the gear 206 is meshed with the gear ring 207; the thickness of the gear ring 207 is greater than the thickness of the gear 206, so that the two are always in a docking state.

[0029] In the above scheme, the piston shaft 204 is initially in an unextended state, the first elastic element 205 is a spring, which is used to drive the piston shaft 204 to reset, the gear 206 and the gear ring 207 are made of insulating lightweight materials, and the workers can adjust the positions of several sliding frames 6 by pressing and rotating the adjustment shaft 201, which is easy to operate and improves the installation speed of the device by the workers.

[0030] When the staff needs to install this device in the distribution cabinet to detect the current in the cable, the cable to be detected is passed through the hole in the middle of the device, and then the device is installed at a specific position of the distribution cabinet, and the two ports 2 are connected to the external current detection device to detect the value of the current in the cable (the detection principle is the basic working principle of the current transformer, which will not be elaborated here). During the use of this device, due to the presence of several electrical components in the distribution cabinet, the electrical components will generate a magnetic field, which interferes with the magnetic field generated by this device, resulting in inaccurate detection data of this device.

[0031] When installing the device, the staff adjusts the positions of all the auxiliary magnetic rings 7 according to the distribution positions of the electrical components in the distribution cabinet. The staff presses the adjusting shaft 201 to make the adjusting shaft 201 push the outer ring 202 and the inner ring 203 to cooperate to form the hydraulic oil in the closed cavity. At this time, the hydraulic oil in the closed cavity pushes the piston shaft 204 under the extrusion force, and the first elastic element 205 is compressed. Then the staff rotates the adjusting shaft 201 to make the adjusting shaft 201 rotate and drive the gear 206 thereon to rotate synchronously, so that the gear 206 drives the inner ring 203 to rotate synchronously through the gear ring 207. At this time, the inner ring 203 drives the piston shaft 204 inside it to rotate synchronously, and so on until the piston shaft 204 contacts the adjacent sliding frame 6. At this time, the staff continues to rotate the adjusting shaft 201 to make the piston shaft 204 drive the adjacent sliding frame 6 to rotate synchronously, and the sliding frame 6 drives the two The secondary magnetic rings 7 rotate synchronously, so that the two secondary magnetic rings 7 change the fitting position with the adjacent main magnetic rings 4, until the highest wave peak of the secondary magnetic ring 7 faces any external electrical component, and then the staff stops pressing the adjustment shaft 201. At this time, the first elastic element 205 drives the piston shaft 204 to reset. At this time, the staff continues to rotate the adjustment shaft 201, so that the inner ring 203 continues to rotate, thereby driving the piston shaft 204 to bypass the sliding frame 6 that has been adjusted. Then the staff presses the adjustment shaft 201 again and repeats the above steps. This cycle is repeated until all the secondary magnetic rings 7 are adjusted. Then the pressing and rotation of the adjustment shaft 201 is stopped. By changing the fitting position of the secondary magnetic ring 7 and the main magnetic ring 4, the side of the main magnetic ring 4 close to the external electrical component forms a superposition state with the secondary magnetic ring 7, thereby increasing the ability to resist external interference magnetic fields and improving the detection accuracy of the current of the device.

[0032] When the magnetic field emitted by an external interference source impacts the magnetic field generated by the device, the magnetic field intensity at the crest of the auxiliary magnetic ring 7 is high, which can more effectively concentrate and guide the magnetic field intensity, and disperse the external magnetic field intensity, reducing the penetration depth of the external magnetic field. At the same time, the height of the crest gradually decreases from the middle to the two sides of the auxiliary magnetic ring 7, making the change of the magnetic field path smoother, reducing the mutation effect of the magnetic field, and thereby improving the uniformity and stability of the magnetic field, further increasing the ability to resist external magnetic field interference, and improving the detection accuracy of the device. At the same time, the wavy structure increases the external area of ​​the auxiliary magnetic ring 7, increases the heat dissipation rate, and reduces the heat accumulation caused by magnetic loss.

[0033] During the detection of the device, the current generated by the cable on the coil 3 will flow to the winding 9 of the stabilizing magnetic ring 8. At this time, the two ends of the input and output lines of the coil 3 are wrapped around the outside of the stabilizing magnetic ring 8, so that the high-frequency electromagnetic signals generated by the input and output lines and the external current detection device are absorbed by the stabilizing magnetic ring 8. At the same time, the two windings 9 cooperate with the stabilizing magnetic ring 8 to form two inductors that can be used as filter inductors, further absorbing high-frequency electromagnetic signals, thereby improving the detection accuracy of the device.

[0034] In a further embodiment, Figure 5-Figure 7 As shown, it also includes: a locking component, which is arranged on the fixed frame 5 and is used to lock all the sliding frames 6 to the fixed frame 5, and the locking component includes: limit blocks 301, which are the same in number as the sliding frames 6 and are respectively slidably connected to adjacent sliding frames 6, and the fixed frame 5 is provided with circumferentially distributed limit grooves 302, and the limit blocks 301 and the limit grooves 302 are limited and cooperated; second elastic elements 303, which are multiples of the number of sliding frames 6, are respectively arranged between adjacent limit blocks 301 and adjacent sliding frames 6; a reset component, which is the same in number as the sliding frames 6, is arranged on the adjacent sliding frames 6, and is used to release the limit of the adjacent limit blocks 301 and the limit grooves 302.

[0035] In the above scheme, the limit block 301 is a rectangular structure, the limit groove 302 is in the shape of a rectangular groove, and fits with the limit block 301 to improve the locking accuracy of the sliding frame 6. The limit grooves 302 on the fixed frame 5 are distributed at equal intervals in the circumferential direction, and the number of the limit grooves 302 can be adjusted according to actual conditions to increase the locking accuracy of the position change of the sliding frame 6. The second elastic element 303 is a spring, which is used to drive the adjacent limit blocks 301 to reset, and the number can be adjusted according to actual conditions.

[0036] Specifically, Figure 5-Figure 7 As shown, the reset assembly includes: a trigger plate 304, which has two and is slidably connected to the two sides of the sliding frame 6; an extrusion block 305, which is the same in number as the trigger plate 304 and is fixedly connected to the adjacent trigger plate 304; a push block 306, which is fixedly connected to the limit block 301, and the two extrusion blocks 305 are both extruded and matched with the adjacent push blocks 306.

[0037] In the above scheme, the material of the trigger plate 304, the extrusion block 305 and the push block 306 is the same as that of the sliding frame 6. The extrusion block 305 has an inclined surface, and the push block 306 has symmetrically distributed inclined surfaces. The two inclined surfaces of the push block 306 are respectively fitted with the inclined surfaces of the two extrusion blocks 305, so that the piston shaft 204 on both sides of the sliding frame 6 can release the locking state of the sliding frame 6 and the fixed frame 5, thereby improving the operating convenience of the staff and improving the installation speed of the device by the staff.

[0038] When the adjusting shaft 201 pushes the sliding frame 6 to change the positions of the two adjacent secondary magnetic rings 7, the adjusting shaft 201 contacts the adjacent trigger plate 304 first. At this time, the piston shaft 204 pushes the adjacent trigger plate 304 to slide along the sliding frame 6. The trigger plate 304 drives the adjacent squeezing block 305 to move synchronously, so that the squeezing block 305 squeezes the adjacent pushing block 306. At this time, the pushing block 306 drives the limit block 301 to slide along the sliding frame 6 under the squeezing force. The limit block 301 is separated from the adjacent limit groove 302, and the locking state between the sliding frame 6 and the fixed frame 5 is released. At the same time, the second elastic element 303 is compressed. Then the staff rotates the adjusting shaft 201, so that the adjusting shaft 201 drives the inner ring 203 to rotate through the gear 206 and the gear ring 207, and the inner ring 203 slides the sliding frame 6 through the piston shaft 204. After moving to the desired position, the staff stops pressing the adjustment shaft 201. At this time, the first elastic element 205 drives the piston shaft 204 to reset, so that the piston shaft 204 is separated from the trigger plate 304. At this time, the second elastic element 303 is reset and pushes the limit block 301 to reset and slide along the sliding frame 6. The limit block 301 squeezes the adjacent squeezing block 305 through the pushing block 306 thereon, so that the squeezing block 305 drives the adjacent trigger plate 304 to reset to the initial state. At the same time, the limit block 301 is docked with the adjacent limit groove 302, so that the sliding frame 6 and the fixed frame 5 are locked with each other, so as to avoid the vibration generated by the electrical components in the distribution cabinet during operation, resulting in relative movement of the sliding frame 6 along the fixed frame 5, causing the fitting position of the secondary magnetic ring 7 and the main magnetic ring 4 to change, thereby reducing the detection accuracy of the device.

[0039] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A current transformer that uses a high-frequency magnetic ring method to suppress electromagnetic interference. Its characteristics include: Housing (1); There are two ports (2), both of which are fixedly connected and penetrate the housing (1); A coil (3) fixedly connected to the interior of the housing (1); There are two main magnetic rings (4), both of which are fixedly connected to the inside of the housing (1) and are respectively distributed on both sides of the coil (3); A fixed frame (5) is fixedly connected to the inside of the housing (1); the fixed frame (5) is slidably connected to a plurality of sliding frames (6); the sliding frames (6) are fixedly connected to two auxiliary magnetic rings (7); the auxiliary magnetic rings (7) are in contact with the adjacent main magnetic rings (4); A stabilizing component, disposed in the housing (1) and used to stabilize the conversion current of the coil (3); A drive assembly is arranged in the housing (1) and is used to change the fitting position of the auxiliary magnetic ring (7) and the main magnetic ring (4).

2. A current transformer for suppressing electromagnetic interference by using a high-frequency magnetic ring method according to claim 1, characterized in that: The stabilizing component comprises: A stabilizing magnetic ring (8) fixedly connected to the interior of the housing (1); The winding wires (9) have two ends, which are wound around and symmetrically distributed on the stabilizing magnetic ring (8), one end of the two winding wires (9) is electrically connected to the two ends of the cable on the coil (3), and the other end of the two winding wires (9) is electrically connected to the two ports (2).

3. A current transformer for suppressing electromagnetic interference by using a high-frequency magnetic ring method according to claim 2, characterized in that: The inner diameter of the coil (3) is smaller than the inner diameter of the main magnetic ring (4), and the outer diameter of the coil (3) is larger than the outer diameter of the main magnetic ring (4).

4. A current transformer for suppressing electromagnetic interference by using a high-frequency magnetic ring method according to claim 1, characterized in that: The exterior of the auxiliary magnetic ring (7) is a continuous wavy arc surface, and continuous arc surfaces are provided on both sides of the auxiliary magnetic ring (7).

5. A current transformer for suppressing electromagnetic interference by using a high-frequency magnetic ring method according to claim 4, characterized in that: The crests of the external wavy arc surface of the secondary magnetic ring (7) gradually decrease in height from the middle to both ends, so as to enable the magnetic field intensity to be continuously changed.

6. A current transformer for suppressing electromagnetic interference by using a high-frequency magnetic ring method according to claim 2, characterized in that: The drive assembly comprises: An adjustment shaft (201) is slidably and rotatably connected to the housing (1), and the adjustment shaft (201) passes through the housing (1); An outer ring (202) is fixedly connected to the interior of the housing (1), and the adjustment shaft (201) is sealingly and slidably connected to the outer ring (202); An inner ring (203) is sealingly rotatably connected to the interior of the outer ring (202), and the two cooperate to form a closed cavity; A pushing assembly is arranged on the adjusting shaft (201) and is used to drive the plurality of sliding frames (6) to slide around the fixing frame (5).

7. A current transformer for suppressing electromagnetic interference by using a high-frequency magnetic ring method according to claim 6, characterized in that: The pushing component comprises: A piston shaft (204) is sealingly and slidably connected in the inner ring (203); the piston shaft (204) is in contact with the sliding frame (6); and a first elastic element (205) is provided between the piston shaft (204) and the inner ring (203); A gear (206) fixedly connected to the adjusting shaft (201) and located inside the housing (1); The gear ring (207) is fixedly connected to the inner ring (203), and the gear (206) is meshed with the gear ring (207).

8. A current transformer for suppressing electromagnetic interference by using a high-frequency magnetic ring method according to claim 7, characterized in that: The thickness of the gear ring (207) is greater than the thickness of the gear (206), so that the two are always in a docking state.

9. A current transformer for suppressing electromagnetic interference by using a high-frequency magnetic ring method according to claim 7, characterized in that: Also included are: A locking assembly is arranged on the fixed frame (5) and is used to lock all the sliding frames (6) to the fixed frame (5), wherein the locking assembly comprises: The limiting blocks (301) are the same in number as the sliding frames (6) and are respectively slidably connected to adjacent sliding frames (6); the fixed frame (5) is provided with circumferentially distributed limiting grooves (302); the limiting blocks (301) are in limiting cooperation with the limiting grooves (302); The number of second elastic elements (303) is a multiple of the number of the sliding frames (6), and they are respectively arranged between adjacent limit blocks (301) and adjacent sliding frames (6); The reset components are the same in number as the sliding frames (6) and are respectively arranged on adjacent sliding frames (6) and are used to release the limiting of adjacent limiting blocks (301) and limiting grooves (302).

10. A current transformer for suppressing electromagnetic interference by using a high-frequency magnetic ring method according to claim 9, characterized in that: The reset component includes: The trigger plates (304) have two parts, which are slidably connected to two sides of the sliding frame (6) respectively; Extrusion blocks (305), the number of which is the same as the trigger plates (304), and which are fixedly connected to adjacent trigger plates (304); The pushing block (306) is fixedly connected to the limiting block (301), and the two extruding blocks (305) are extruded and matched with the adjacent pushing blocks (306).

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