Three-phase unbalanced current measuring device

Abstract

To provide a three-phase unbalanced current measuring device which can store cables in an orderly manner, can avoid knots, further reduces bending friction of the cables, and prevents an electric clip from being accidentally released. [Solution] The three-phase unbalanced current measuring device comprises a device case 1, a winding assembly, and a cable assembly, with a display and control buttons on the front of the device case, a main control board mounted inside, storage grooves on both sides of the lower back, a winding roller rotatably connected in the center of the cavity of the storage groove, conductor rotating rollers 5 installed symmetrically above and below the notch, a locking bar 6 attached to the periphery of the notch, a cable 7 wound around the surface of the winding roller and guided by two sets of conductor rotating rollers before extending outward, with an electrical clip 8 connected to its end. Non-slip handles are rotatably connected to the bottom of both sides of the device case, and are connected coaxially with the winding rollers.

Description

[Technical Field]

[0001] The present invention relates to the field of current measurement technology, and specifically to a three-phase unbalanced current measurement device. [Background technology]

[0002] Three-phase unbalanced current refers to the phenomenon in which the amplitude or phase angle of each phase of a three-phase AC power system differs. Ideally, the three-phase currents should be equal in magnitude and 120° out of phase with each other. However, in actual operation, factors such as uneven load distribution, equipment failures, and line impedance differences can lead to three-phase current imbalances. These factors include uneven load distribution, line impedance differences, and the effects of nonlinear loads. The effects of three-phase imbalance include increased line losses, abnormal equipment operation, reduced power quality, and malfunctioning protective devices. Although three-phase imbalance can be caused by uneven load distribution, line failures, or equipment defects, the current differences cannot be directly observed with the naked eye. Measuring devices can monitor the amplitude, phase, and harmonic content of each phase current in real time, quantifying the degree of imbalance and helping users quickly identify the source of the problem.

[0003] The cable storage structure of conventional three-phase current measuring devices has several drawbacks. First, the cable storage device lacks an orderly guide mechanism, which makes repeated cable storage operations prone to tangling and knotting, making operation difficult and excessive bending leading to wear on the cable insulation. Second, the conventional storage mechanism lacks an effective cable end fixing structure, making the electrical clip prone to unexpected release due to vibration or external force when not in operation. Furthermore, adjusting the cable length requires repeated manual winding, which is cumbersome. Third, the winding assembly lacks a reliable locking mechanism, making the cable prone to loosening due to inertia during transportation and use. At the same time, the cable length adjustment range is limited, making it difficult to meet the needs of measurement scenarios with different intervals. These deficiencies lead to problems such as increased equipment maintenance costs, reduced measurement efficiency, and unreliable test results. Therefore, we propose a three-phase unbalanced current measuring device. Summary of the Invention [Problem to be solved by the invention]

[0004] In response to the shortcomings of the prior art, the present invention provides a three-phase unbalanced current measuring device to solve the technical problems that, during repeated cable storage as described above, tangling and knotting are likely to occur, making operation difficult, and excessive bending can wear down the cable insulation layer. [Means for solving the problem]

[0005] To achieve the above object, the present invention provides the following technical solution: A three-phase unbalanced current measuring device, comprising: The device comprises a device case, a display and a control button provided on the front of the device case, a main control board is also provided in the cavity of the device case, and a storage groove is provided on both sides of the lower back of the device case; The winding roller is rotatably connected to the center of the cavity of the receiving groove, and the conductor rotating rollers are rotatably connected to the upper and lower outer ends of the receiving groove, and a locking bar is attached around the outer end of the receiving groove. The cable is provided on the surface of the winding roller, and the outer end of the cable is extended outward by two sets of conductor rotating rollers, and an electric clip is connected to the outer end of the cable; The anti-slip handles are rotatably connected to the bottom of both sides of the device case, and the anti-slip handles are coaxially connected to corresponding ends of the winding roller. Locking posts are slidably connected to both sides of the device case, and the locking posts are engaged with the surfaces of the anti-slip handles. By rotating the anti-slip handles at the bottom of both sides of the device case, the operator drives the winding roller, which is coaxially connected to the anti-slip handles, to rotate in the storage groove, and gradually release the cable wound around the surface of the winding roller.

[0006] During the release process, the cable passes through two sets of conductor rotating rollers in sequence, the outer end of which is rotatably connected to the upper and lower outer ends of the receiving groove, and the guiding action of the conductor rotating rollers ensures that the cable extends outward along a predetermined path.

[0007] Once the cable has been extended to the desired length, the operator clamps the electrical clips at the outer ends of the cable to the corresponding measurement points on the three-phase circuit under test, completing the physical connection.

[0008] The main control board in the device case receives the current signals collected by the electric clips via the cable, analyzes the amplitude and phase difference of the three-phase current in real time, and calculates the unbalance parameters.

[0009] The main control board transfers the processed data to the display on the front of the device case, where the three-phase unbalance status is intuitively displayed digitally or in the form of a waveform diagram.

[0010] The operator can use the control buttons to switch display modes and search past data to assist in completing the fault diagnosis.

[0011] After completing the measurement, the operator rotates the anti-skid handle in the reverse direction to rotate the take-up roller, and the cable is stored in the storage groove along its original path.

[0012] When the cable is completely retracted, the locking posts on both sides of the device case are slid to fit the ends of the locking posts into the locking grooves on the surface of the non-slip handle, thereby fixing the position of the winding roller.

[0013] The electrical clip on the outer end of the cable is temporarily secured by a locking bar around the outer end of the storage groove to prevent shaking during transport.

[0014] The main control board consists of a signal acquisition module, a signal processing module, a display driver module, a control module, and a memory module. The signal acquisition module receives current signals from the three-phase circuit via the cable terminal's electrical clips and converts the analog electrical signals into digital signals for post-processing. The signal processing module analyzes the acquired current signals in real time and calculates the three-phase current amplitude, phase difference, and unbalance parameters. The display driver module converts the processed data into a signal format recognizable by the display and drives the display to intuitively display the three-phase unbalance status in digital, waveform, or trend graph format. The control module analyzes commands entered by the operator via the control buttons, controls the operating mode of the display driver module, and coordinates the coordinated operation of other modules. The memory module, with its built-in flash or SD card interface, stores past measurement data, imbalance threshold configuration, and device calibration parameters and supports high-speed read / write to ensure data integrity.

[0015] Preferably, T-shaped grooves are provided at the center lower portion of both sides of the device case, and guide rods are attached to the center of the inner cavity of the T-shaped grooves. T-shaped grooves are provided symmetrically at the lower portion of both sides of the device case, and guide rods are fixedly attached to the center of the inner cavity of the T-shaped grooves. The guide rods extend in the longitudinal direction of the T-shaped grooves, and both ends of the guide rods are fixedly connected to the inner walls of the T-shaped grooves, forming a stable guide structure.

[0016] Preferably, a slide block is fitted onto the underside of the surface of the guide rod, a link is attached to the outside of the slide block, a connecting bracket is added to the outer end of the link, and the locking post and the connecting bracket are rotatably connected. The slide block is fitted onto the underside of the surface of the guide rod, and can slide in the axial direction of the guide rod, the outside of the slide block is connected to the connecting bracket via the link, and both ends of the link are fixed to the slide block and the connecting bracket respectively, and the locking post is connected to the connecting bracket via a revolute pair, so as to realize the rotational movement of the locking post.

[0017] Preferably, a compression spring is fitted onto the upper surface of the guide rod, with both ends of the compression spring respectively connected to the surface of the slide block and the inner wall of the T-shaped groove. When the slide block is moved downward by an external force, the compression spring is compressed, and after the external force is removed, the spring recovers its deformation and returns the slide block to its original position.

[0018] Preferably, side plungers are inserted into the lower part of both sides of the back surface of the device case, with the inner ends of the side plungers penetrating the surface of the device case and extending into the T-shaped groove, and sloped fittings are attached to the inner ends of the side plungers. The side plungers are inserted from the back surface of the device case, with their inner ends extending into the T-shaped groove and fixedly connected to the sloped fittings. When the slide block rises along the T-shaped groove by the locking posts, the periphery of the slide block is designed to be sloped. When the slide block abuts on the sloped fittings, the sloped fittings cause the side plungers to slide outward along the inner wall of the T-shaped groove, and the side plungers rotate the sloped fittings, thereby adjusting the positional relationship between the sloped parts of the sloped fittings and the slide block.

[0019] Preferably, a return spring is fitted onto the surface of the side plunger, with both ends of the return spring contacting the inner wall of the device case and the surface of the side plunger, respectively. When the side plunger is pulled outward, the return spring is pulled. After the external force is released, the spring recovers its deformation and automatically drives the side plunger to return. [Effects of the Invention]

[0020] Compared with the prior art, the present invention provides a three-phase unbalanced current measuring device, which has the following beneficial effects: This three-phase unbalanced current measuring device has a rotatable winding roller and conductor rotating roller in the rear storage groove, which allows the cable to be stored in an orderly manner and knots to be avoided. The guiding action of the conductor rotating roller further reduces bending friction of the cable, extending its service life. The combination of the locking bar and anti-slip handle design firmly restricts the position of the outer end of the cable, preventing the electrical clip from accidentally coming loose when stored. The rotation of the anti-slip handle simplifies the process of adjusting the cable length, and combined with the locking function of the locking bar, it fixes the position of the winding roller to prevent the cable from loosening during transportation or use. The cable length can be freely adjusted by winding it around the winding roller, meeting the needs of various measurement scenarios. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a diagram showing the overall configuration of the present invention. [Figure 2] FIG. 2 is a left rear side view of the entire device. [Figure 3] FIG. 3 is a schematic diagram of the winding roller and its connecting structure of the present invention. [Figure 4] FIG. 4 is an enlarged partial cross-sectional view of the device case of the present invention. [Figure 5] FIG. 5 is a schematic diagram of the guide rod and its connecting structure of the present invention. [Figure 6] FIG. 6 is a schematic diagram of the side plunger and its connecting structure of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] The technical means in the embodiments of the present invention will be described below clearly and completely with reference to the drawings of the embodiments of the present invention, but it is clear that the described embodiments are only some of the embodiments of the present invention and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any creative work fall within the scope of protection of the present invention.

[0023] The present invention provides a technical solution for a three-phase unbalanced current measuring device. Referring to Figures 1, 2 and 3, the three-phase unbalanced current measuring device includes a device case 1, a display 2 and a control button 3 provided on the front of the device case 1, a main control board is also provided inside the device case 1, and receiving grooves are provided on both sides of the lower back of the device case 1, The winding roller 4 is rotatably connected to the center of the cavity of the storage groove, and the conductor rotating rollers 5 are rotatably connected to the upper and lower outer ends of the storage groove. A locking bar 6 is attached around the outer end of the storage groove. The cable 7 is provided on the surface of the winding roller 4, and the outer end of the cable 7 is extended outward by two pairs of conductor rotating rollers 5, and an electric clip 8 is connected to the outer end of the cable 7. Non-slip handles 9 are rotatably connected to the lower sides of the device case 1, and the non-slip handles 9 are coaxially connected to the corresponding ends of the winding roller 4. Locking posts 10 are slidably connected to the both sides of the device case 1, and the locking posts 10 are engaged with the surface of the non-slip handles 9. By rotating the non-slip handles 9 at the lower sides of the device case 1, the operator drives the winding roller 4, which is coaxially connected to the non-slip handles 9, to rotate within the storage groove, and gradually releases the cable 7 wound around the surface of the winding roller 4.

[0024] During the release process, the cable 7 passes through two sets of conductor rotating rollers 5 in sequence, the outer ends of which are rotatably connected to the upper and lower outer ends of the receiving groove, and the guiding action of the conductor rotating rollers 5 ensures that the cable 7 extends outward along a predetermined path.

[0025] When the cable 7 is extended to the desired length, the operator clamps the electrical clip 8 at the outer end of the cable 7 to the corresponding measurement point of the three-phase circuit under test, completing the physical connection.

[0026] The main control board in the device case 1 receives the current signals collected by the electric clips 8 via the cable 7, analyzes the amplitude and phase difference of the three-phase current in real time, and calculates the unbalance parameter.

[0027] The main control board transfers the processed data to the display 2 on the front of the device case 1, and the three-phase unbalance state is intuitively displayed in the form of a digital or waveform diagram.

[0028] The operator can use control button 3 to switch display modes and retrieve past data to assist in completing the fault diagnosis.

[0029] After the measurement is completed, the operator rotates the non-slip handle 9 in the reverse direction to rotate the winding roller 4, and the cable 7 is stored in the storage groove along its original path.

[0030] When the cable 7 is completely stored, the locking posts 10 on both sides of the device case 1 are slid to fit the ends of the locking posts 10 into the locking grooves on the surface of the non-slip handle 9, thereby fixing the position of the winding roller 4.

[0031] An electrical clip 8 at the outer end of the cable 7 is temporarily secured by a locking bar 6 around the outer end of the storage groove to prevent shaking during transport.

[0032] The coaxial connection design of the winding roller 4 and the non-slip handle 9 enables the cables 7 to be quickly retracted, and all cables 7 can be deployed or retracted in one operation, significantly reducing the deployment time on site.

[0033] The integrated design of the rear storage groove of the device case 1 allows the cable 7 to be completely built in, making the equipment compact and easy for one person to carry to complex measurement environments.

[0034] 4 and 5, a T-shaped groove is provided at the center of the bottom of both sides of the device case 1, and a guide rod 11 is attached to the center of the T-shaped groove. Symmetrical T-shaped grooves are provided at the bottom of both sides of the device case 1, and guide rods 11 are fixedly attached to the center of the T-shaped grooves. The guide rods 11 extend longitudinally of the T-shaped grooves, and both ends are fixedly connected to the inner walls of the T-shaped grooves, forming a stable guide structure. The engagement between the T-shaped grooves and the guide rods 11 provides a precise linear motion path for the sliding components, ensuring smooth movement and enhancing the structural strength of the device case 1. A slide block 13 is fitted to the bottom surface of the guide rod 11, and a link 14 is attached to the outside of the slide block 13. A connecting bracket 15 is added to the outer end of the link 14, and the locking post 10 and the connecting bracket 15 are rotatably connected. The slide block 13 is fitted onto the lower surface of the guide rod 11 and is slidable in the axial direction of the guide rod 11. The outside of the slide block 13 is connected to a connecting bracket 15 via a link 14, and both ends of the link 14 are fixed to the slide block 13 and the connecting bracket 15, respectively. The locking post 10 is connected to the connecting bracket 15 via a revolute pair, allowing the locking post 10 to rotate. The combination of the slide block 13 and the link 14 converts linear movement into displacement of the connecting bracket 15, which, together with the rotational connection of the locking post 10, achieves multi-degree-of-freedom movement transmission and improves the adaptability of the device. A compression spring 12 is fitted onto the upper surface of the guide rod 11, and both ends of the compression spring 12 are connected to the surface of the slide block 13 and the inner wall of the T-shaped groove, respectively. The compression spring 12 is fitted onto the upper surface of the guide rod 11, with both ends abutting the upper surface of the slide block 13 and the inner wall of the T-shaped groove, respectively. When the slide block 13 moves downward due to an external force, the compression spring 12 is compressed, and after the external force is removed, the spring recovers its deformation and returns to its original position, restoring the slide block 13. The compression spring 12 provides a cushioning effect to reduce the impact of the slide block 13 during movement, and at the same time, its elastic force allows the slide block 13 to automatically return to its original position, simplifying the operation process.

[0035] Referring to Figures 2 and 6, side plungers 16 are inserted into the lower parts on both sides of the back surface of the device case 1, and the inner ends of the side plungers 16 penetrate the surface of the device case 1 and extend into the T-shaped groove, and a sloped fitting portion 18 is attached to the inner ends of the side plungers 16. The side plunger 16 is inserted from the back of the device case 1, with its inner end extending into the T-groove and fixedly connected to the sloped mating portion 18. When the locking post 10 moves the slide block 13 up along the T-groove, the slide block 13 forms a slope around its periphery. When it abuts against the sloped mating portion 18, the sloped mating portion 18 causes the side plunger 16 to slide outward along the inner wall of the T-groove. The side plunger 16 rotates the sloped mating portion 18, adjusting the positional relationship between the sloped portion of the sloped mating portion 18 and the slide block 13. The sloped mating portion 18 adjusts the position by pushing or pulling the side plunger 16. The sloped design optimizes contact with the moving parts, improving the reliability of the locking or stopper function. A return spring 17 is fitted onto the surface of the side plunger 16, with both ends connecting with the inner wall of the device case 1 and the surface of the side plunger 16, respectively. The return spring 17 is fitted onto the surface of the side plunger 16, with both ends abutting the inner wall of the device case 1 and the surface of the side plunger 16, respectively. When the side plunger 16 is pulled outward, the return spring 17 is also pulled. After the external force is released, the spring recovers its deformation and automatically drives the side plunger 16 to return. The return spring 17 ensures that the side plunger 16 maintains its initial position without external force, avoiding malfunctions due to incorrect operation and simplifying the manual return process.

[0036] This solution: The operator rotates the anti-slip handles 9 on the bottom of both sides of the device case 1, driving the winding roller 4, which is coaxially connected to the anti-slip handles 9, to rotate within the storage groove, gradually releasing the cable 7 wound around the surface of the winding roller 4.

[0037] During the release process, the cable 7 passes through two sets of conductor rotating rollers 5 in sequence, the outer ends of which are rotatably connected to the upper and lower outer ends of the receiving groove, and the guiding action of the conductor rotating rollers 5 ensures that the cable 7 extends outward along a predetermined path.

[0038] When the cable 7 is extended to the desired length, the operator clamps the electrical clip 8 at the outer end of the cable 7 to the corresponding measurement point of the three-phase circuit under test, completing the physical connection.

[0039] The main control board in the device case 1 receives the current signals collected by the electric clips 8 via the cable 7, analyzes the amplitude and phase difference of the three-phase current in real time, and calculates the unbalance parameter.

[0040] The main control board transfers the processed data to the display 2 on the front of the device case 1, and the three-phase unbalance state is intuitively displayed in the form of a digital or waveform diagram.

[0041] The operator can use control button 3 to switch display modes and retrieve past data to assist in completing the fault diagnosis.

[0042] After the measurement is completed, the operator rotates the non-slip handle 9 in the reverse direction to rotate the winding roller 4, and the cable 7 is stored in the storage groove along its original path.

[0043] When the cable 7 is completely stored, the locking posts 10 on both sides of the device case 1 are slid to fit the ends of the locking posts 10 into the locking grooves on the surface of the non-slip handle 9, thereby fixing the position of the winding roller 4.

[0044] An electrical clip 8 at the outer end of the cable 7 is temporarily secured by a locking bar 6 around the outer end of the storage groove to prevent shaking during transport.

[0045] T-shaped grooves are provided at the center bottom of both sides of the device case 1, and guide rods 11 are fixedly attached to the center of the inner cavity of the T-shaped grooves. The guide rods 11 extend in the longitudinal direction of the T-shaped grooves, and both ends of the guide rods are fixedly connected to the inner walls of the T-shaped grooves, forming a stable guide structure.

[0046] The slide block 13 is fitted onto the underside of the surface of the guide rod 11 and can slide in the axial direction of the guide rod 11. The outside of the slide block 13 is connected to a connecting bracket 15 via a link 14, and both ends of the link 14 are fixed to the slide block 13 and the connecting bracket 15, respectively. The locking column 10 is connected to the connecting bracket 15 via a revolute pair, which allows the locking column 10 to rotate.

[0047] The compression spring 12 is fitted onto the upper surface of the guide rod 11, and both ends abut against the upper surface of the slide block 13 and the inner wall of the T-shaped groove, respectively. When the slide block 13 moves downward due to an external force, the compression spring 12 is compressed, and after the external force is removed, the spring recovers its deformation and returns the slide block 13 to its original position.

[0048] The side plunger 16 is inserted from the back of the device case 1, and its inner end extends into the T-shaped groove and is fixedly connected to the sloped fitting portion 18. When the slide block 13 rises along the T-shaped groove by the locking pillar 10, the sloped design of the slide block 13 abuts against the sloped fitting portion 18, driving the side plunger 16 to slide outward along the inner wall of the T-shaped groove.

[0049] The return spring 17 is fitted onto the surface of the side plunger 16, and both ends of the return spring 17 abut against the inner wall of the device case 1 and the surface of the side plunger 16, respectively. When the side plunger 16 moves outward, the return spring 17 is pulled, and elastic deformation causes the side plunger 16 to automatically return to its original position.

[0050] It should be noted that, in this document, relational terms such as "first," "second," etc., are used only to distinguish one entity or operation from another, and do not necessarily require or imply that any actual relationship or order exists between those entities or operations. Furthermore, the use of "comprises," "includes," or other variations of any of these terms implies an inclusion that is not exclusive. Thus, a process, method, article, or facility that includes a set of elements includes not only those elements but also other elements not expressly listed or that are inherent in such process, method, article, or facility.

[0051] While embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention, and the scope of the present invention is limited by the appended claims and their equivalents. [Explanation of symbols]

[0052] 1 Device case 2 displays 3 Control Buttons 4 Winding roller 5 Conductor rotation roller 6 Locking bar 7 Cable 8 electrical clips 9 Non-slip handle 10 Locking pillar 11 Guide rod 12 compression spring 13 Slide Block 14 Links 15 Connecting bracket 16 Side plunger 17 Return spring 18 Sloped fitting part

Claims

1. 1. A three-phase unbalanced current measurement device, comprising: The device comprises a device case (1), a display (2) and a control button (3) provided on the front of the device case (1), a main control board is also provided in the cavity of the device case (1), and storage grooves are provided on both sides of the lower back of the device case (1); The winding roller (4) is rotatably connected to the center of the cavity of the storage groove, and conductor rotating rollers (5) are rotatably connected to the upper and lower outer ends of the storage groove, and a locking bar (6) is attached around the outer end of the storage groove. The cable (7) is provided on the surface of the winding roller (4), and the outer end of the cable (7) is extended outward by two sets of conductor rotating rollers (5), and an electric clip (8) is connected to the outer end of the cable (7); The three-phase unbalanced current measuring device is characterized in that anti-slip handles (9) are rotatably connected to the lower part of both sides of the device case (1), and the anti-slip handles (9) are coaxially connected to the corresponding ends of the winding roller (4), and locking posts (10) are slidably connected to both sides of the device case (1), and the locking posts (10) are engaged with the surfaces of the anti-slip handles (9).

2. 2. The three-phase unbalanced current measuring device according to claim 1, wherein a T-shaped groove is provided at the center bottom of both sides of the device case (1), and a guide rod (11) is attached to the center of the inner cavity of the T-shaped groove.

3. 3. The three-phase unbalanced current measuring device according to claim 2, wherein a slide block (13) is fitted onto the lower surface of the guide rod (11), a link (14) is attached to the outside of the slide block (13), a connecting bracket (15) is added to the outer end of the link (14), and the locking post (10) and the connecting bracket (15) are rotatably connected.

4. 4. The three-phase unbalanced current measuring device according to claim 3, wherein a compression spring (12) is fitted onto the upper surface of the guide rod (11), and both ends of the compression spring (12) are connected to the surface of the slide block (13) and the inner wall of the T-shaped groove, respectively.

5. 2. The three-phase unbalanced current measuring device according to claim 1, wherein side plungers (16) are inserted into the lower portions on both sides of the rear surface of the device case (1), the inner ends of the side plungers (16) penetrate the surface of the device case (1) and extend into T-shaped grooves, and a sloped fitting portion (18) is attached to the inner ends of the side plungers (16).

6. 6. The three-phase unbalanced current measuring device according to claim 5, wherein a return spring (17) is fitted onto the surface of the side plunger (16), and both ends of the return spring (17) are connected to the inner wall of the device case (1) and the surface of the side plunger (16), respectively.

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