A portable low-voltage current transformer calibration device

Abstract

A portable low-voltage current transformer calibration device includes a main body and further includes: a rotating base disposed on both side walls of the main body; a U-shaped handle mounted on the rotating base, having mounting holes with movable columns disposed within the mounting holes; a wire disposed inside the U-shaped handle and connected to a low-voltage power supply disposed within the main body to form a closed circuit; and a sheath covering the outside of the U-shaped handle. When the U-shaped handle is flipped upwards in a first position, an electromagnetic generator is energized to generate a first magnetic field, providing an upward lifting and buffering force for the U-shaped handle; when the U-shaped handle is flipped downwards in a second position, the electromagnetic generator is energized to generate a second magnetic field, providing downward elastic support for the calibration device. The sheath structure reduces fatigue at the head and mitigates vibration damage to the device.

Description

Technical Field

[0001] This invention relates to the technical field of current transformer calibration devices, and more specifically to a portable low-voltage current transformer calibration device. Background Technology

[0002] Portable low-voltage current transformer calibration devices are key equipment in power system metering, operation and maintenance, and field testing. They are used to verify the metering performance of low-voltage current transformers, such as ratio error and phase error, on-site. The accuracy of these measurements is directly related to the fairness of trade settlement and the reliability of power grid monitoring data.

[0003] With the advancement of smart grid construction and condition-based maintenance of power equipment, the demand for on-site verification is increasing, placing higher demands on the portability, environmental adaptability, and long-term reliability of verification devices. However, current low-voltage current transformer verification devices typically only have rigid U-shaped metal or plastic handles on both sides of the chassis. Operators must move and transport the device with a certain weight by hand. The rigid handles lack shock absorption and cushioning for the palm area, and prolonged handling can easily lead to hand soreness and fatigue, affecting work efficiency.

[0004] The device integrates high-precision analog signal conditioning circuits, high-speed A / D measurement modules, and other electronic components. Existing designs generally rigidly fix the handle to the chassis. When the device is in noisy areas such as vehicle transportation, factory areas, or outdoors, the U-shaped handle itself cannot buffer the vibrations experienced by the current transformer calibration device. External vibrations and impacts are transmitted to the entire chassis without attenuation. This continuous mechanical stress can easily lead to device failure.

[0005] Chinese patent application number 202220701211.8 discloses a portable AC charging pile metering and verification device. A processor, energy collector, voltage transformer, current transformer, relay, and battery are fixed to the upper part of a supporting base plate by screws. Input and output interface boards are respectively embedded at both ends of the housing. A display panel and multiple adjustment buttons are embedded at the upper end of the housing, and a handle is connected to the front of the housing via a spring shaft. While the spring shaft connection to the handle provides shock absorption, it does not provide shock absorption for the palm area.

[0006] Chinese patent application number 201821873244.0 discloses a packaging box with a temperature control display, including a box body, an anti-collision rubber strip on the lower side of the box body, a display screen on one side of the box body, an observation window on one side of the display screen, a latch on the side of the display screen, and a cover plate on the upper side of the box body. The box body and the cover plate are connected by the latch. The side of the box body is provided with a mounting block, a protrusion, a handle, a rotating rod, a spring, and a finger groove. The handle and rotating rod only provide a simple lifting function and do not provide shock absorption for the palm area.

[0007] Therefore, there is an urgent need for a low-voltage current transformer calibration device that can effectively reduce vibration transmitted to the operator to reduce fatigue when carried by hand, and effectively isolate impacts from the ground when placed. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a portable low-voltage current transformer calibration device. This device solves the problems of existing current transformer calibration devices using rigid handles that lack cushioning for the palm area, leading to fatigue, and the device being susceptible to damage to its internal circuitry from mechanical stress impacts from the ground.

[0009] The present invention adopts the following technical solution. A portable low-voltage current transformer calibration device includes a body, and the calibration device further includes: Rotary seats are mounted on both side walls of the machine body; A U-shaped handle is installed on the rotating base. The U-shaped handle has multiple mounting holes. A movable column is provided in each mounting hole. The movable column can move up and down along the axial direction of the mounting hole. The movable column includes a column body and an electromagnetic generator installed in the column body. Conductive terminals are provided at both ends of the electromagnetic generator. A first conductive plate and a second conductive plate are respectively provided on the inner walls of both sides of the mounting hole along the extension direction of the U-shaped handle. A wire is installed inside the U-shaped handle and connected to a low-voltage power supply installed inside the machine body. The wire connects the first conductive piece and the second conductive piece of each mounting hole in series to form a closed loop. A protective sleeve is provided around the outside of the U-shaped handle. The top of the inner wall of the protective sleeve is provided with a first permanent magnet and the bottom is provided with a second permanent magnet. The positions of the first permanent magnet and the second permanent magnet correspond to those of the movable column. The rotating drive column of the U-shaped handle moves along the direction of gravity within the mounting hole to switch the circuit on / off and current direction of the electromagnetic generator. This causes the electromagnetic generator to generate a first magnetic field for gripping when the U-shaped handle is in the first position, and a second magnetic field for supporting when the U-shaped handle is in the second position.

[0010] Preferably, when the U-shaped handle is flipped upwards in the first position, the conductive terminal at the upper end of the movable column contacts and conducts electricity with the first conductive piece and the second conductive piece. When the electromagnetic generator is energized, it generates a first magnetic field. The first magnetic field has the same magnetic pole as the side of the first permanent magnet facing the electromagnetic generator and generates a repulsive force, and has the opposite magnetic pole to the side of the second permanent magnet facing the electromagnetic generator and generates an attractive force. When the U-shaped handle is flipped downwards to the second position, the conductive terminal at the lower end of the movable column contacts and connects with the first and second conductive plates. The electromagnetic generator is energized to generate a second magnetic field. The second magnetic field is opposite to the magnetic pole of the side of the first permanent magnet facing the electromagnetic generator, thus generating an attractive force, and is the same as the magnetic pole of the side of the second permanent magnet facing the electromagnetic generator, thus generating a repulsive force.

[0011] Preferably, the cavity between the sheath and the U-shaped handle is filled with damping grease or flexible silicone.

[0012] Preferably, the damping grease contains dispersed spheres, which are made of elastic material and have an iron core at their center.

[0013] Preferably, the outer perimeter of the U-shaped handle is greater than half the outer perimeter of the machine body.

[0014] Preferably, the movable column has elastic ends at both ends, and the elastic ends are in elastic contact with the inner wall of the sheath.

[0015] Preferably, the sheath is made of an elastic insulating material, the elastic force of which is used to drive the movable column back to a symmetrical state within the mounting hole when the U-shaped handle is not being gripped or bearing weight.

[0016] Preferably, the first permanent magnet and the second permanent magnet are fixed to the inner wall of the sheath by adhesive bonding or snap-fitting.

[0017] Preferably, the body is provided with a measurement circuit, which includes a digital signal channel and an analog signal channel, and the body is connected to a display module.

[0018] Preferably, the display module is located on the front of the device.

[0019] The beneficial effects of this invention are that, compared with the prior art, This invention enables both lifting and placing of the calibration device by flipping a U-shaped handle. Inside the sheath, a movable column that moves up and down under gravity is installed. When the U-shaped handle is flipped upwards for lifting, the movable column moves downwards under gravity, forming a closed loop that generates a first magnetic field from the electromagnetic generator. This magnetic field repels the first permanent magnet above the sheath and attracts the second permanent magnet below, providing an upward lifting and cushioning force. The magnetic field also causes the iron core at the center of the sphere to accumulate in the damping grease, altering the density of the medium within the sheath and making the grip area softer, thus reducing hand fatigue.

[0020] When the U-shaped handle is flipped downwards for support, the movable column moves downwards under the action of gravity. The closed loop formed by the connection causes the electromagnetic generator to produce a second magnetic field in the opposite direction, which attracts the first permanent magnet above the sheath and repels the second permanent magnet below the sheath. This provides downward elastic support for the calibration device, which can isolate vibrations and impacts from the factory floor, transport vehicles or rough surfaces, and reduce the damage of vibrations to precision instruments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the portable low-voltage current transformer calibration device of the present invention. Figure 2 This is a schematic diagram of the internal structure of the sheath of the portable low-voltage current transformer calibration device of the present invention; Figure 3 This is a partially enlarged schematic diagram of part A of the portable low-voltage current transformer calibration device of the present invention; Figure 4 This is a schematic diagram of the movable column structure of the portable low-voltage current transformer calibration device of the present invention; Figure 5 This is a schematic diagram of the spherical structure of the portable low-voltage current transformer calibration device of the present invention; Figure 6 This is a schematic diagram of the internal structure of the sphere in the portable low-voltage current transformer calibration device of the present invention; Figure 7 This is a schematic diagram of the overall structure of the portable low-voltage current transformer calibration device of the present invention with the handle flipped down.

[0022] The labels for the attached figures are as follows: 1. Body, 2. Rotating seat, 3. U-shaped handle, 4. Mounting hole, 5. Movable column, 6. Column, 7. Electromagnetic generator, 8. Sheath, 9. First permanent magnet, 10. Second permanent magnet, 11. Conductive terminal, 12. First conductive sheet, 13. Second conductive sheet, 14. Wire, 15. Sphere, 16. Sphere center, 17. Flexible end, 18. Display module. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0024] The technical solution adopted in this invention is as follows: like Figures 1 to 7This invention discloses a portable low-voltage current transformer calibration device.

[0025] like Figure 1 As shown, the low-voltage current transformer calibration device includes a body 1, which is equipped with a digital signal input terminal, an analog AC signal input terminal, and a display module 18. The display module 18 is installed on the front of the body. The body 1 contains multiple digital signal channels and multiple analog signal channels. The analog signal channels include a programmable amplifier module, a self-calibration module, a high-speed frequency division sampling and holding module, and a high-speed A / D measurement module. The digital signal channels include a photoelectric signal conversion module. A synchronization signal generator and a receiver are installed between the signal channels. The display module 18 is used to output multiple sets of data list signals of the current transformer calibrator.

[0026] The programmable amplifier module automatically or manually adjusts the amplification factor based on the input signal amplitude to match the range requirements of subsequent sampling modules. The self-calibration module automatically calibrates and compensates for errors in the electrical parameters of the analog channel, ensuring measurement accuracy. The high-speed frequency division sample-and-hold module performs high-speed sampling and amplitude holding of the analog signal, providing a stable input for A / D conversion. The high-speed A / D measurement module converts the sampled and held analog signal into a digital signal, achieving the digitization of the analog signal.

[0027] like Figure 2-6 As shown, rotating seats 2 are mounted on both side walls of the body 1. Each rotating seat is equipped with a U-shaped handle 3, and the U-shaped handle has multiple mounting holes 4, ranging from 4 to 8. In this embodiment, there are 4 mounting holes 4. Movable columns 5 are installed within each mounting hole 4, and these columns 5 move up and down along the axial direction of the mounting hole 4. Each movable column 5 includes a column body 6, within which an electromagnetic generator 7 is installed. Conductive terminals 11 are located at both ends of the electromagnetic generator 7, generating magnetic force when the generator conducts electricity. Elastic ends 17 are also provided at both ends of the movable column 5, making elastic contact with the interior of the sheath 8 to allow for the up and down movement of the movable column 5. First conductive plates 12 and second conductive plates 13 are distributed on the inner walls of both sides of the mounting holes along the extension direction of the U-shaped handle 3.

[0028] The testing device also includes multiple wires 14. The wires 14 at both ends of the U-shaped handle 3 are connected to the positive and negative terminals of the low-voltage power supply inside the body 1. The multiple wires 14 in the middle are connected in sequence to the first conductive plate 12 and the second conductive plate 13 of the adjacent mounting holes 4 to form a closed loop in series.

[0029] The U-shaped handle 3 is covered by a protective sleeve 8, which is made of insulating plastic and surrounds the main body of the U-shaped handle 3. A first permanent magnet 9 is bonded to the upper part of the inner wall of the protective sleeve 8, and a second permanent magnet 10 is bonded to the lower part. The positions of the first permanent magnet 9, the second permanent magnet 10, and the movable column 5 correspond to each other. The cavity between the protective sleeve 8 and the U-shaped handle 3 is filled with damping grease, and spheres 15 are dispersed within the damping grease. The spheres 15 are made of elastic material and have an iron core 16 at their center.

[0030] The outer perimeter of the U-shaped handle 3 is greater than half the outer perimeter of the machine body. The flip-drive movable column 5 of the U-shaped handle 3 moves along the direction of gravity within the mounting hole 4 to switch the circuit on / off and current direction of the electromagnetic generator 7. When the U-shaped handle 3 is flipped upwards in the first position for gripping, the movable column 5 moves downwards under the action of gravity. The wire terminal 11 at the upper end of the movable column 5 contacts and conducts electricity with the first conductive plate 12 and the second conductive plate 13. The electromagnetic generator 7 is energized and generates a first magnetic field. The first magnetic field has the same magnetic pole as the side of the first permanent magnet 9 facing the electromagnetic generator 7, generating a repulsive force, and has the opposite magnetic pole to the side of the second permanent magnet 10 facing the electromagnetic generator 7, generating an attractive force. The center 16 of the spheres 15 dispersed in the damping grease moves under the action of magnetic force. The spheres 15 closer to the first permanent magnet 9 move upward and the spheres 15 closer to the second permanent magnet 10 move downward, moving closer to the electromagnetic generator 7. At the same time, the movement of the spheres 15 compresses the damping grease and moves it to the outer side of the inner cavity of the sheath 8, providing a buffering force when the hand grips the U-shaped handle 3 and increasing the buffering effect. Meanwhile, the movable column 5 has space for up and down movement, allowing up and down vibration, which makes it convenient for the palm to press against the upper part of the sheath 8 to exert force and reduce hand fatigue.

[0031] like Figure 7 As shown, the U-shaped handle 3 is flipped downwards in the second position for support. When placed, the movable column 5, under the action of gravity, makes the conductive terminal 11 at its lower end contact and conduct with the first conductive plate 12 and the second conductive plate 13. The electromagnetic generator 7 is energized to generate a second magnetic field. The second magnetic field is opposite to the magnetic pole of the side of the first permanent magnet 9 facing the electromagnetic generator 7, generating an attractive force, and is the same as the magnetic pole of the side of the second permanent magnet 10 facing the electromagnetic generator 7, generating a repulsive force. The center 16 of the spheres 15 dispersed in the damping grease moves closer to the electromagnetic generator 7 under the action of magnetic force, squeezing the damping grease to move to the outside of the sheath 8. During the placement of the calibration device, it provides a buffering force to reduce the damage of external vibration to the internal instruments.

[0032] When the U-shaped handle 3 is placed horizontally and is not being held or bearing weight, the elastic insulating material of the sheath 8 drives the movable column 5 to move to a state of vertical symmetry within the mounting hole 4. The conductive terminal 11 will not contact the first conductive piece 12 and the second conductive piece 13, and no magnetic field is generated at this time.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A portable low-voltage current transformer calibration device, comprising a body (1), characterized in that, The testing device also includes: Rotary seats (2) are provided on both sides of the body (1); A U-shaped handle (3) is installed on the rotating seat (2). The U-shaped handle (3) is provided with multiple mounting holes (4). A movable column (5) is provided in the mounting hole (4). The movable column (5) can move up and down along the axial direction of the mounting hole (4). It includes a column body (6) and an electromagnetic generator (7) provided in the column body (6). The electromagnetic generator (7) is provided with conductive terminals (11) at both ends. A first conductive plate (12) and a second conductive plate (13) are respectively provided on the inner walls of both sides of the mounting hole (4) along the extension direction of the U-shaped handle (3). The wire (14) is set inside the U-shaped handle (3) and connected to the low-voltage power supply set inside the body (1). The wire (14) connects the first conductive piece (12) and the second conductive piece (13) of each mounting hole (4) in series to form a closed loop. A sheath (8) is wrapped around the outside of the U-shaped handle (3). The top of the inner wall of the sheath (8) is provided with a first permanent magnet (9) and the bottom is provided with a second permanent magnet (10). The positions of the first permanent magnet (9) and the second permanent magnet (10) correspond to those of the movable column (5). The flip-drive movable column (5) of the U-shaped handle (3) moves along the direction of gravity in the mounting hole (4) to switch the circuit on / off and current direction of the electromagnetic generator (7), so that the electromagnetic generator (7) generates a first magnetic field for gripping when the U-shaped handle (3) is in the first position, and generates a second magnetic field for supporting when the U-shaped handle (3) is in the second position.

2. The portable low-voltage current transformer calibration device according to claim 1, characterized in that, When the U-shaped handle (3) is flipped upwards and in the first position, the conductive terminal (11) at the upper end of the movable column (5) contacts and conducts with the first conductive piece (12) and the second conductive piece (13). The electromagnetic generator (7) is energized and generates a first magnetic field. The first magnetic field has the same magnetic pole as the side of the first permanent magnet (9) facing the electromagnetic generator (7) and generates a repulsive force, and has the opposite magnetic pole to the side of the second permanent magnet (10) facing the electromagnetic generator (7) and generates an attractive force. When the U-shaped handle (3) is flipped downwards and in the second position, the conductive terminal (11) at the lower end of the movable column (5) contacts and conducts with the first conductive piece (12) and the second conductive piece (13). The electromagnetic generator (7) is energized to generate a second magnetic field. The second magnetic field is opposite to the magnetic pole of the side of the first permanent magnet (9) facing the electromagnetic generator (7) and generates an attractive force, and is the same as the magnetic pole of the side of the second permanent magnet (10) facing the electromagnetic generator (7) and generates a repulsive force.

3. The portable low-voltage current transformer calibration device according to claim 1, characterized in that, The cavity between the sheath (8) and the U-shaped handle (3) is filled with damping grease or flexible silicone.

4. The portable low-voltage current transformer calibration device according to claim 3, characterized in that, The damping grease contains dispersed spheres (15), which are made of elastic material and have an iron core (16) at their center.

5. The portable low-voltage current transformer calibration device according to claim 1, characterized in that, The outer perimeter of the U-shaped handle (3) is greater than half the outer perimeter of the body (1).

6. The portable low-voltage current transformer calibration device according to claim 1, characterized in that, The movable column (5) has elastic ends (17) at both ends, and the elastic ends (17) are in elastic contact with the inner wall of the sheath (8).

7. The portable low-voltage current transformer calibration device according to claim 1, characterized in that, The sheath (8) is an elastic insulating material, and its elastic force is used to drive the movable column (5) back to a symmetrical state within the mounting hole (4) when the U-shaped handle (3) is not being held or under load.

8. The portable low-voltage current transformer calibration device according to claim 1, characterized in that, The first permanent magnet (9) and the second permanent magnet (10) are fixed to the inner wall of the sheath (8) by adhesive bonding or snap-fitting.

9. The portable low-voltage current transformer calibration device according to claim 1, characterized in that, The body (1) is equipped with a measurement circuit, which includes a digital signal channel and an analog signal channel. The body (1) is connected to a display module (18).

10. The portable low-voltage current transformer calibration device according to claim 9, characterized in that, The display module (18) is located on the front of the body (1).

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