A sensor for extracting current magnetostrictive signals

Abstract

The invention discloses a current magnetostrictive signal extraction sensor, comprising a shell and a protective cover, wherein the front of the shell is fixedly connected to the back of the protective cover, and the invention relates to the technical field of current signal extraction. The current magnetostrictive signal extraction sensor is fixedly connected with a magnetic rod through the inside of a wire drum, and a coil is fixedly connected with the surface of the wire drum, the wire diameter of the coil is 0.1 mm, the number of turns of the coil is 1500t, the inductive reactance of the coil is 30mH±15%, the DC impedance of the coil is 155Ω±10%, the diameter of the magnetic rod is 10 mm, and the length of the magnetic rod is 30 mm, μ=1800±25%. By using various parameters of the sensor coil provided in the scheme, when the sensor is close to a wire through which current flows, the magnetic field will generate an induced voltage at both ends of the sensor coil, and the form of the voltage and the form of the magnetic field present the same change law, so that the sensor can effectively extract the magnetic field signal, providing a basis for subsequent analysis of the operating health of electrical equipment.

Description

Technical Field

[0001] The invention relates to the technical field of current signal extraction, in particular to a current magneto-induced signal extraction sensor. Background Art

[0002] Electrical equipment is a general term for generators, transformers, power lines, circuit breakers and other equipment in the power system. The important role that electricity plays in our lives and production cannot be ignored. It brings us great convenience and becomes an important energy source in our production and life. The most critical factor for the normal operation and transmission of electricity in power plants is electrical equipment. When inspecting electrical equipment, it is often necessary to collect some electrical information of the electrical equipment for analysis while the electrical equipment remains in operation, such as the current information of the transmission cables of the electrical equipment.

[0003] Current detection mainly uses current sensors or Hall sensors. The working principle of the sensor is that the current flowing through the wire will generate a magnetic field around the wire. The strength and shape of the magnetic field signal can reflect the operating status of the electrical equipment to a certain extent. However, the sensors that can extract magnetic field signals have strict requirements on various parameters. At present, there is no special device on the market that can effectively extract magnetic field signals to provide a basis for subsequent analysis of the operating status of electrical equipment. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the shortcomings of the prior art, the present invention provides a current magnetostrictive signal extraction sensor, which solves the problem that there is currently no special device on the market that can effectively extract magnetic field signals and provide a basis for subsequent analysis of the operating health of electrical equipment.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a current magnetostrictive signal extraction sensor, comprising a shell and a protective cover, the front side of the shell is fixedly connected to the back side of the protective cover, both sides of the inner wall of the shell are fixedly connected with fixed blocks, and a wire drum is movably connected between the opposite sides of the two fixed blocks, a magnetic rod is fixedly connected to the inside of the wire drum, and a coil is fixedly connected to the surface of the wire drum, the front sides of the two fixed blocks are fixedly connected with stoppers, the front side of the top of the shell is fixedly connected with a mounting block, the top of the shell and the rear side of the mounting block are fixedly connected with a connecting block, and an arc groove is opened on the front side of the connecting block, the back side of the mounting block is movably connected with a movable plate, and the back side of the movable plate contacts the front side of the connecting block, and the back side of the shell is fixedly connected with a signal line connector.

[0008] Preferably, the wire diameter of the coil is 0.1 mm, the number of turns of the coil is 1500t, the inductive reactance of the coil is 30mH±15%, and the DC impedance of the coil is 155Ω±10%.

[0009] Preferably, the diameter of the magnetic bar is 10 mm, the length of the magnetic bar is 30 mm, and μ=1800±25%.

[0010] Preferably, the protective cover is threadedly connected with a first screw all around, and first threaded holes matching the first screws are provided all around the protective cover and the front of the shell, an annular limit strip is fixedly connected to the back of the protective cover, and an annular limit groove matching the annular limit strip is provided on the front of the shell.

[0011] Preferably, a mounting groove adapted to the wire reel is provided on one side of the fixing block, a second screw is threadedly connected to the top and bottom of the front side of the block, and a second threaded hole adapted to the second screw is provided inside the block and the fixing block, a limiting block is fixedly connected to the back side of the block, and the back side of the limiting block contacts the surface of the wire reel.

[0012] Preferably, the back side of the mounting block is slidably connected to a movable rod, and a movable groove is opened inside the mounting block, the front side of the inner wall of the movable groove is fixedly connected to a spring, and one end of the spring is fixedly connected to a slide plate, the surface of the slide plate is slidably connected to the inner wall of the movable groove, and the back side of the slide plate is fixedly connected to one end of the movable rod, three movable rods are arranged on the back side of the mounting block, and one end of the three movable rods are fixedly connected to the front side of the movable plate.

[0013] Preferably, the housing, protective cover, fixing block, mounting block and connecting block are all made of plastic components.

[0014] Preferably, the limit block is made of insulating rubber material.

[0015] (III) Beneficial effects

[0016] The present invention provides a current magnetostrictive signal extraction sensor. Compared with the prior art, it has the following beneficial effects:

[0017] (1) The current magneto-induced signal extraction sensor has fixed blocks on both sides of the inner wall of the shell, and a wire drum is movably connected between the two opposite sides of the two fixed blocks, a magnetic rod is fixedly connected inside the wire drum, and a coil is fixedly connected to the surface of the wire drum, the wire diameter of the coil is 0.1 mm, the number of turns of the coil is 1500t, the inductive reactance of the coil is 30mH±15%, and the DC impedance of the coil is 155Ω±10%, the diameter of the magnetic rod is 10 mm, and the length of the magnetic rod is 30 mm, μ=1800±25%, using the various parameters of the sensor coil provided in the scheme, when the sensor is close to the wire through which current flows, the magnetic field will generate an induced voltage at both ends of the sensor coil, and the shape of the voltage shows the same change law as the shape of the magnetic field, so that the sensor can effectively extract the magnetic field signal, providing a basis for subsequent analysis of the operating health of the electrical equipment.

[0018] (2) The current magnetostrictive signal extraction sensor is fixedly connected to a mounting block through the front side of the top of the shell, and a connecting block is fixedly connected to the top of the shell and located at the rear side of the mounting block, and an arc groove is provided on the front side of the connecting block, and a movable plate is movably connected to the back side of the mounting block, and the back side of the movable plate contacts the front side of the connecting block, a signal line connector is fixedly connected to the back side of the shell, a movable rod is slidably connected to the back side of the mounting block, and a movable groove is provided inside the mounting block, a spring is fixedly connected to the front side of the inner wall of the movable groove, and a slide plate is fixedly connected to one end of the spring, the surface of the slide plate is slidably connected to the inner wall of the movable groove, and the back side of the slide plate is fixedly connected to one end of the movable rod, three movable rods are arranged on the back side of the mounting block, and one end of the three movable rods are fixedly connected to the front side of the movable plate, and the cooperation between the mounting block, the connecting block and the movable plate can conveniently fix the cable of the electrical equipment to be tested on the shell of the sensor, so that the sensor can extract the magnetic field signal of the cable to be tested more stably and effectively, the structural design is simple, the manufacturing cost is low, and it is also convenient to use.

[0019] (3) The current magnetostrictive signal extraction sensor is threadedly connected with a first screw on all sides of the protective cover, and first threaded holes compatible with the first screws are provided on all sides of the protective cover and the front of the shell, an annular limit strip is fixedly connected to the back of the protective cover, and an annular limit groove compatible with the annular limit strip is provided on the front of the shell, a mounting groove compatible with the wire drum is provided on one side of the fixed block, a second screw is threadedly connected to the top and bottom of the front of the block, and second threaded holes compatible with the second screws are provided inside the block and the fixed block, a limiting block is fixedly connected to the back of the block, and the back of the limiting block contacts the surface of the wire drum, the annular limit strip provided on the back of the protective cover is connected with the annular limit groove on the front of the shell to ensure the stability of the connection between the protective cover and the shell, and the limiting block provided on the back of the block can ensure the stability of the installation of the wire drum inside the two fixed blocks, so that the sensor is more stable when extracting magnetic field signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of the structure of the current magneto-induced signal extraction sensor of the present invention;

[0021] Figure 2 It is a front view of the housing structure of the present invention;

[0022] Figure 3 is a cross-sectional view of the bobbin and coil structure of the present invention;

[0023] Figure 4 It is a side view of the internal structure of the fixing block of the present invention;

[0024] Figure 5 A top view of the internal structure of the mounting block of the present invention;

[0025] Figure 6 It is a rear view of the protective cover structure of the present invention;

[0026] Figure 7 This is a rear view of the current magnetostrictive signal extraction sensor structure of the present invention.

[0027] In the figure, 1-housing, 2-protective cover, 3-fixed block, 4-bobbin, 5-magnetic rod, 6-coil, 7-stopper, 8-mounting block, 9-connecting block, 10-arc groove, 11-movable plate, 12-signal line connector, 13-first screw, 14-first threaded hole, 15-annular limit strip, 16-annular limit groove, 17-mounting groove, 18-second screw, 19-second threaded hole, 20-limiting block, 21-movable rod, 22-movable groove, 23-spring, 24-slide plate. DETAILED DESCRIPTION

[0028] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-7The embodiment of the present invention provides a technical solution: a current magnetostrictive signal extraction sensor, comprising a shell 1 and a protective cover 2, the shell 1, the protective cover 2, the fixed block 3, the mounting block 8, and the connecting block 9 are all made of plastic material components, the limit block 20 is made of insulating rubber material components, the front of the shell 1 is fixedly connected to the back of the protective cover 2, the two sides of the inner wall of the shell 1 are fixedly connected with the fixed blocks 3, and the two opposite sides of the two fixed blocks 3 are movably connected with a wire drum 4, the inside of the wire drum 4 is fixedly connected with a magnetic rod 5, and the surface of the wire drum 4 is fixedly connected with a coil 6, the wire diameter of the coil 6 is 0.1 mm, and the number of turns of the coil 6 is 1500t, the inductive reactance of the coil 6 is 30mH±15%, and the DC impedance of the coil 6 is 155Ω±1 0%, the diameter of the magnetic rod 5 is 10 mm, and the length of the magnetic rod 5 is 30 mm, μ = 1800 ± 25%, the sensor senses the current flowing inside the cable to be tested, and the magnetic field generated by the coil 6 and the magnetic rod 5 between the two fixed blocks 3 will generate an induced voltage at both ends of the coil 6, and the shape of the voltage and the shape of the magnetic field show the same change law. The magnetic field signal extracted by the sensor is transmitted to the analysis equipment through the signal line, which provides a basis for the subsequent analysis of the operating status of the electrical equipment. The first screw 13 is threadedly connected to the protective cover 2 on all sides, and the surfaces of the first screw 13, the second screw 18, and the spring 23 are fixedly connected with an insulating rubber sleeve. Preferably, the first screw 13, the second screw 18, and the spring 23 are made of plastic material components, and the protective cover 2 is made of plastic material components. First threaded holes 14 compatible with the first screws 13 are provided on the four sides of the cover 2 and the four sides of the front of the shell 1, and an annular limiting strip 15 is fixedly connected to the back of the protective cover 2. The annular limiting strip 15 on the back of the protective cover 2 is matched with the annular limiting groove 16 on the front of the shell 1, so that the connection between the protective cover 2 and the shell 1 is more stable, and an annular limiting groove 16 compatible with the annular limiting strip 15 is provided on the front of the shell 1. A mounting groove 17 compatible with the wire drum 4 is provided on one side of the fixing block 3, and a second screw 18 is threadedly connected to the top and bottom of the front of the stopper 7, and a second threaded hole 19 compatible with the second screw 18 is provided inside the stopper 7 and the fixing block 3. The back of the stopper 7 is fixedly connected to the limiting block 20. When installing the wire drum 4 When installing, put the two ends of the wire drum 4 into the installation grooves 17 inside the two fixed blocks 3, use the second screw 18 to fix the stopper 7 on the front of the fixed block 3, and the rubber limit block 20 on the back of the stopper 7 contacts the two ends of the wire drum 4, so that the wire drum 4 is stably installed between the two fixed blocks 3, and the back of the limit block 20 contacts the surface of the wire drum 4, the front sides of the two fixed blocks 3 are fixedly connected with the stopper 7, the front side of the top of the shell 1 is fixedly connected with the installation block 8, the back side of the installation block 8 is slidably connected with the movable rod 21, and the inside of the installation block 8 is provided with a movable groove 22, the front side of the inner wall of the movable groove 22 is fixedly connected with a spring 23, and one end of the spring 23 is fixedly connected with a slide plate 24, and the surface of the slide plate 24 is slidably connected with the inner wall of the movable groove 22.The back of the slide plate 24 is fixedly connected to one end of the movable rod 21. Three movable rods 21 are arranged on the back of the mounting block 8, and one end of each of the three movable rods 21 is fixedly connected to the front of the movable plate 11. A connecting block 9 is fixedly connected to the top of the housing 1 and located on the rear side of the mounting block 8, and an arc groove 10 is provided on the front of the connecting block 9. The back of the mounting block 8 is movably connected to the movable plate 11. Under the action of the movable rod 21, the slide plate 24 and the spring 23, the movable plate 11 limits the cable to be tested in the arc groove 10 on the front of the connecting block 9, and the back of the movable plate 11 contacts the front of the connecting block 9. A signal line connector 12 is fixedly connected to the back of the housing 1. At the same time, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0030] When in use, the cable of the electrical device to be tested is placed in the arc groove 10 on the front of the connecting block 9. The movable plate 11 limits the cable to be tested in the arc groove 10 on the front of the connecting block 9 under the action of the movable rod 21, the slide plate 24 and the spring 23. The signal line is connected to the signal line connector 12 on the back of the housing 1, and the cable to be tested is energized. The sensor senses the current flowing inside the cable to be tested. The magnetic field generated by the coil 6 and the magnetic bar 5 between the two fixed blocks 3 will generate an induced voltage at both ends of the coil 6. The shape of the voltage shows the same change law as the shape of the magnetic field. The magnetic field signal extracted by the sensor is transmitted to the analysis unit through the signal line. In the device, in order to provide a basis for the subsequent analysis of the operating status of the electrical equipment, when installing the wire reel 4, the two ends of the wire reel 4 are placed in the installation grooves 17 inside the two fixed blocks 3, and the block 7 is fixed to the front of the fixed block 3 by the second screw 18. The rubber limit block 20 on the back of the block 7 contacts the two ends of the wire reel 4, so that the wire reel 4 is stably installed between the two fixed blocks 3. Finally, the protective cover 2 is installed on the front of the outer shell 1 by the first screw 13. At the same time, the annular limit strip 15 on the back of the protective cover 2 is matched with the annular limit groove 16 on the front of the outer shell 1 to make the connection between the protective cover 2 and the outer shell 1 more stable.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A current magneto-induced signal extraction sensor, comprising a housing (1) and a protective cover (2), wherein the front surface of the housing (1) is fixedly connected to the back surface of the protective cover (2), and characterized in that: Both sides of the inner wall of the shell (1) are fixedly connected with fixed blocks (3), and a bobbin (4) is movably connected between opposite sides of the two fixed blocks (3), a magnetic rod (5) is fixedly connected inside the bobbin (4), and a coil (6) is fixedly connected on the surface of the bobbin (4), and the front sides of the two fixed blocks (3) are fixedly connected with stoppers (7), the front side of the top of the shell (1) is fixedly connected with a mounting block (8), the top of the shell (1) and the rear side of the mounting block (8) are fixedly connected with a connecting block (9), and an arc groove (10) is provided on the front side of the connecting block (9), the back side of the mounting block (8) is movably connected with a movable plate (11), and the back side of the movable plate (11) contacts the front side of the connecting block (9), and the back side of the shell (1) is fixedly connected with a signal line connector (12).

2. A current magneto-induced signal extraction sensor according to claim 1, characterized in that: The wire diameter of the coil (6) is 0.1 mm, the number of turns of the coil (6) is 1500t, the inductive reactance of the coil (6) is 30 mH±15%, and the DC impedance of the coil (6) is 155Ω±10%.

3. The current magnetostrictive signal extraction sensor according to claim 1, characterized in that: The diameter of the magnetic bar (5) is 10 mm, and the length of the magnetic bar (5) is 30 mm, μ=1800±25%; μ is the magnetic permeability.

4. A current magneto-induced signal extraction sensor according to claim 1, characterized in that: The protective cover (2) is threadedly connected to first screws (13) on all sides, and first threaded holes (14) matching the first screws (13) are provided on all sides of the protective cover (2) and on all sides of the front of the housing (1). An annular limiting strip (15) is fixedly connected to the back of the protective cover (2), and an annular limiting groove (16) matching the annular limiting strip (15) is provided on the front of the housing (1).

5. The current magneto-induced signal extraction sensor according to claim 1, characterized in that: A mounting groove (17) adapted to the bobbin (4) is provided on one side of the fixing block (3); a second screw (18) is threadedly connected to the top and bottom of the front side of the stopper (7); and a second threaded hole (19) adapted to the second screw (18) is provided inside the stopper (7) and the fixing block (3); a limit block (20) is fixedly connected to the back side of the stopper (7), and the back side of the limit block (20) contacts the surface of the bobbin (4).

6. The current magneto-induced signal extraction sensor according to claim 1, characterized in that: The back side of the mounting block (8) is slidably connected to a movable rod (21), and a movable groove (22) is provided inside the mounting block (8); a spring (23) is fixedly connected to the front side of the inner wall of the movable groove (22), and one end of the spring (23) is fixedly connected to a slide plate (24); the surface of the slide plate (24) is slidably connected to the inner wall of the movable groove (22), and the back side of the slide plate (24) is fixedly connected to one end of the movable rod (21); three movable rods (21) are arranged on the back side of the mounting block (8), and one end of each of the three movable rods (21) is fixedly connected to the front side of the movable plate (11).

7. The current magneto-induced signal extraction sensor according to claim 1, characterized in that: The housing (1), the protective cover (2), the fixing block (3), the mounting block (8), and the connecting block (9) are all made of plastic components.

8. The current magneto-induced signal extraction sensor according to claim 5, characterized in that: The limit block (20) is made of an insulating rubber material component.

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