Voltage transformer error verification device and method
Through the coordination of the beam wire assembly and the rotating assembly, the problem of confusion in the connection wire winding in the voltage transformer error verification is solved, efficient multiple data verification is achieved, and detection efficiency and convenience are improved.
Patent Information
- Application Number
- CN202510483152.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-17
- Publication Date
- 2025-07-18
AI Technical Summary
During the error verification process of existing voltage transformers, the connecting wires are prone to wrapping and disorder, resulting in inefficiency and inability to perform multiple data verifications efficiently.
The wiring assembly and the rotating assembly are used to separate the wires between the transformer to be tested and the standard transformer to avoid winding and disorder, and alternately connect it with the error calibrator and the phase-locked amplifier to achieve multiple data calibrations.
It improves the efficiency and convenience of error verification, avoids winding and disorder of connecting lines, and ensures the unblocking and efficient detection of multiple connecting lines.
Smart Images
Figure CN120334833A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of voltage transformer calibration, and specifically to a voltage transformer error calibration device and method. Background Technique
[0002] A voltage transformer is a voltage measurement device for a power system. Error performance is its key performance, and the accuracy test is an important test to verify whether its error performance meets the requirements, which is related to whether the voltage transformer can accurately provide signals for measurement and control, and protection devices. Compared with the verification tests of insulation, heat, and mechanical performance, only the establishment of the test power supply is required to meet the test requirements. A broadband test power supply can be obtained by a frequency conversion power supply cooperating with a series resonance circuit, or can also be directly obtained by a frequency conversion power supply cooperating with a test transformer, which is an existing technology, and relevant equipment manufacturing enterprises can realize its manufacture. Due to the particularity of the requirements for the transformer accuracy test, in addition to solving the test power supply problem, the problem of test equipment also needs to be solved. The voltage transformer error calibration technology is an important part of the voltage ratio standard value traceability technology.
[0003] In the prior art, when calibrating the error of a voltage transformer by relying on an error calibrator to measure the voltage transformer under test at different frequencies and different primary voltages, it is necessary to use a standard voltage transformer in cooperation, and in order to ensure accuracy, it is also necessary to additionally use a lock-in amplifier for secondary data verification to improve the accuracy of error calibration. A large number of terminal connections are involved in this process. On the calibration bench, a large number of connections are prone to confusion, and due to the need to replace different testers, the efficiency is low. Summary of the Invention
[0004] To solve the deficiencies in the prior art, the present invention provides a voltage transformer error calibration device and method to solve the problems raised in the above background technique. The structure of the present invention is novel. Through the cooperation of the wire bundling component and the rotating component, the connections of the voltage transformer under test and the standard voltage transformer are separated from each other, avoiding the problems of entanglement and confusion, and alternately connecting with the error calibrator and the lock-in amplifier. While performing multiple data verifications, it is possible to dredge multiple connection wires, improving the efficiency and convenience of error calibration.
[0005] The present invention adopts the following technical solutions.
[0006] In a first aspect of the present invention, a voltage transformer error calibration device is disclosed, including a detection bench, an output box is fixed on one side of the detection bench, a gear disk is installed on the top of the other side of the detection bench through a bearing, an error calibrator and a lock-in amplifier are symmetrically installed on the top surface of the gear disk, and the connection ends of the error calibrator and the lock-in amplifier face opposite directions for the detection and calibration of the voltage transformer;
[0007] An installation component is provided between the detection table and the output box. The installation component includes a storage groove. Inside the storage groove, there is a moving table. A bearing plate is fixed on the top of the moving table. A placement groove is fixed on the top of the bearing plate. The to-be-detected mutual inductor and the standard mutual inductor are respectively placed in the placement groove;
[0008] A wire bundling component is installed on the surface of the detection table between the installation component and the gear disk. The wire bundling component includes two groups of sliding plates. Two groups of spring clips are rotatably installed on the top of the sliding plates. The connecting wires of the to-be-detected mutual inductor and the standard mutual inductor pass through the spring clips and are connected to the error calibrator and the phase-locked amplifier;
[0009] A rotating component is provided on one side of the detection table with respect to the gear disk. The rotating component includes a toothed plate. The toothed plate slides along the surface of the detection table, and the toothed plate is meshed with the outer side of the gear disk. A grounding end is installed on the surface of the detection table between the output box and the installation component.
[0010] Preferably, guide rails are fixed on both sides of the inner wall of the storage groove corresponding to the bottom of the bearing plate. The bearing plate slides along the guide rails.
[0011] Preferably, the installation component further includes limit blocks. Limit blocks are provided on both sides of the top of the storage groove corresponding to the bearing plate, and the limit blocks are in pressing contact with the bottom sides of the corresponding to-be-detected mutual inductor and standard mutual inductor. A plug rod is slidably inserted at a position on the detection table corresponding to the back of the limit block, and one end of the plug rod is fixed to the limit block. The other end of the plug rod is sleeved with a first spring.
[0012] Preferably, one end of the inner side of the bearing plate is provided with an inclined surface. An inclined plate is provided at a position in the storage groove corresponding to the inclined surface, and the inclined plate slides along the inclined surface. Two ejector rods are symmetrically and rotatably installed at the top of the inclined plate through a rotating shaft, and the tops of the ejector rods are respectively rotatably connected to the limit blocks on both sides through a rotating shaft.
[0013] Preferably, sliding grooves are opened on both inner walls of the storage groove, and both ends of the inclined plate slide inside the sliding grooves. A spring is fixedly connected between the top of the sliding groove and the inclined plate.
[0014] Preferably, a baffle is rotatably installed at the outer end of the storage groove through a rotating shaft, and the other end of the baffle is fixed to the detection table through a bolt.
[0015] Preferably, the wire bundling component further includes a connecting plate. The connecting plate is slidably inserted at the bottom of the two groups of sliding plates. Spring telescopic rods are equidistantly fixed at the bottom of the connecting plate, and the retracting ends of the spring telescopic rods are fixed inside the detection table.
[0016] Preferably, a connecting block is fixed on one side of the sliding plate corresponding to the bearing plate. A vertical rod is fixed on the bearing plate, and one end of the connecting block is slidably sleeved on the vertical rod.
[0017] Preferably, the rotating assembly further includes a built-in telescopic rod. A built-in telescopic rod is fixed to the bottom of the connecting block on one side of the toothed plate where the detection table is located. The extending end of the built-in telescopic rod passes through the detection table and is fixed with a vertical block. The top of the vertical block is rotatably installed with a plug board through a bearing. A slot is opened in the connecting block corresponding to the position of the plug board.
[0018] Preferably, the other side of the vertical block is rotatably connected to a connecting rod through a rotating shaft, and the other end of the connecting rod is rotatably connected to the back of the toothed plate through a rotating shaft.
[0019] Preferably, a second spring is fixed to the detection table corresponding to the position of the toothed plate, and the other end of the second spring is fixedly connected to the toothed plate.
[0020] The second aspect of the present invention discloses a method for calibrating the error of a voltage transformer, based on the above-mentioned voltage transformer error calibration device, including the following steps:
[0021] Connect the voltage transformer to be measured, the standard transformer and the error calibrator into a difference loop, and use the error calibrator to measure the first ratio error and the first phase error of the measured voltage transformer under different frequencies and different primary voltages;
[0022] Through the switching of the wire bundling assembly and the rotating assembly, disconnect the wiring of the error calibrator, connect the lock-in amplifier to the difference loop, and use the lock-in amplifier to measure the second ratio error and the second phase error of the measured voltage transformer under different frequencies and different primary voltages;
[0023] Determine the measurement error of the error calibrator according to the first ratio error, the first phase error, the second ratio error and the second phase error.
[0024] Compared with the prior art, the beneficial effects of the present invention at least include:
[0025] 1. After the transformer is installed and the connecting wire of the transformer is inserted into the spring clip, manually press the connecting plate to the bottommost position, compress the spring telescopic rod. At this time, the length of the connecting wire just meets the connection with the connection ends of the error calibrator and the lock-in amplifier. At this time, the plug board passes through the slot, and then rotate the plug board to misalign it with the slot, so as to complete the locking connection between the vertical block and the connecting block. After the subsequent detection is completed, when the connecting wire of the transformer is separated from the error calibrator and the lock-in amplifier manually, under the action of the elastic force of the spring telescopic rod, the connecting plate is pushed up, and at the same time, the vertical block is driven to move upward, the built-in telescopic rod extends, the connecting rod pulls the toothed plate to move, and the second spring assists in pulling the toothed plate to move and engage with the toothed disc. The toothed disc rotates to swap the positions of the error calibrator and the lock-in amplifier, which is convenient for subsequent secondary reference experiments.
[0026] 2. During the detection process of the present invention, the skateboard is at the bottommost position. When separating the connecting wire from the error calibrator and the phase-locked amplifier after the detection is completed, the connecting wire is automatically lifted by the action of the spring telescopic rod, which facilitates finding the connecting wire of the corresponding terminal during subsequent continuous detection and can avoid the accumulation and entanglement of the connecting wire. The skateboard is pulled out together with the carrier plate through the connecting block and slides along the connecting plate. When the connecting plate descends, the connecting block slides along the vertical rod to maintain connectivity.
[0027] 3. The present invention installs the mutual inductor in the placement groove of the carrier plate. Subsequently, the moving table is pushed into the storage groove. The inclined surface of the carrier plate squeezes the inclined plate, and the inclined plate moves upward along the sliding groove. Through the ejector rod, the two side limiting blocks are moved closer to each other to clamp and limit the bottom of the mutual inductor. By blocking the outlet end of the storage groove with the baffle plate, the mutual inductor can be kept installed on the detection table. The movement of the limiting block is controlled and guided by the insertion rod and the first spring, realizing the convenience of clamping and fixing the mutual inductor.
[0028] 4. Compared with the prior art, the present invention, through the cooperation of the wire bundling assembly and the rotating assembly, separates the connecting wires of the mutual inductor under test and the standard mutual inductor from each other, avoiding the problems of entanglement and disorder. And it is alternately connected to the error calibrator and the phase-locked amplifier. While performing multiple data calibrations, it can dredge multiple connecting wires, improving the efficiency and convenience of error calibration. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 is the overall structure schematic diagram of a voltage mutual inductor error calibration device of the present invention;
[0030] Figure 2 is the top structure schematic diagram of the detection table of a voltage mutual inductor error calibration device of the present invention;
[0031] Figure 3 is the side structure schematic diagram of the detection table of a voltage mutual inductor error calibration device of the present invention;
[0032] Figure 4 is the structure schematic diagram of the installation assembly of a voltage mutual inductor error calibration device of the present invention;
[0033] Figure 5 is the contact schematic diagram of the carrier plate and the inclined plate of a voltage mutual inductor error calibration device of the present invention;
[0034] Figure 6 is the structure schematic diagram of the wire bundling assembly and the rotating assembly of a voltage mutual inductor error calibration device of the present invention;
[0035] Figure 7 is the connection schematic diagram of the wire bundling assembly and the rotating assembly of a voltage mutual inductor error calibration device of the present invention;
[0036] Figure 8 This is a schematic diagram of the bottom structure of the connecting plate of an error calibration device for a voltage transformer according to the present invention.
[0037] In the figure: 1, detection table; 11, error calibrator; 12, phase-locked amplifier; 13, grounding terminal; 14, storage groove; 2, output box; 21, interface terminal; 3, installation component; 31, moving table; 32, guide rail; 33, baffle; 34, bearing plate; 35, placement groove; 36, limiting block; 37, insertion rod; 38, first spring; 39, inclined surface; 310, inclined plate; 311, ejector rod; 312, sliding groove; 4, voltage transformer to be measured; 41, standard voltage transformer; 5, wire bundling component; 51, connecting plate; 52, sliding plate; 53, spring clip; 54, connecting block; 55, vertical rod; 56, slot; 57, spring telescopic rod; 6, rotating component; 61, built-in telescopic rod; 62, vertical block; 63, insertion plate; 64, connecting rod; 65, second spring; 66, toothed plate; 67, toothed disc. Detailed implementation manners
[0038] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described in this application are only a part of the embodiments of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0039] Please refer to Figures 1 to 8, Embodiment 1 of the present invention provides a technical solution: a voltage transformer error calibration device, including a detection table 1, an output box 2 is fixed on one side of the detection table 1, and two interface ends 21 are arranged on the upper surface of the output box 2. On the other side of the detection table 1, a gear disk 67 is installed through a bearing at the top, and an error calibrator 11 and a phase-locked amplifier 12 are symmetrically installed on the top surface of the gear disk 67. The connection ends of the error calibrator 11 and the phase-locked amplifier 12 face opposite directions. An installation component 3 is arranged between the gear disk 67 and the output box 2 on the detection table 1. The installation component 3 includes a storage groove 14. Storage grooves 14 are opened on both sides of the detection table 1, and a moving table 31 is arranged inside the storage groove 14. A bearing plate 34 is fixed on the top of the moving table 31, and guide rails 32 are fixed on both sides of the inner wall of the storage groove 14 corresponding to the bottom of the bearing plate 34. The bearing plate 34 slides along the guide rails 32. A placement groove 35 is fixed on the top of the bearing plate 34. A voltage transformer under test 4 and a standard voltage transformer 41 are respectively placed in the placement grooves 35 on both sides of the detection table 1. A wire bundling component 5 is installed on the surface of the detection table 1 between the installation component 3 and the gear disk 67. The wire bundling component 5 includes two groups of sliding plates 52. Two groups of spring clips 53 are rotatably installed on the top of the sliding plates 52. The connection wires of the voltage transformer under test 4 and the standard voltage transformer 41 pass through the spring clips 53 and are connected to the error calibrator 11 and the phase-locked amplifier 12. A rotation component 6 is arranged on one side of the detection table 1 where the gear disk 67 is located. The rotation component 6 includes a toothed plate 66. The toothed plate 66 slides along the surface of the detection table 1, and the toothed plate 66 is meshed with the outer side of the gear disk 67. A grounding terminal 13 is installed on the surface of the detection table 1 between the output box 2 and the installation component 3.
[0040] The detection method of the voltage transformer in this solution:
[0041] Connect the voltage transformer under test, the standard voltage transformer, and the error calibrator 11 into a difference loop, and use the error calibrator 11 to measure the first ratio error and the first phase error of the voltage transformer under test at different frequencies and different primary voltages;
[0042] Disconnect the wiring of the error calibrator 11, connect the phase-locked amplifier 12 into the difference loop, and use the phase-locked amplifier 12 to measure the second ratio error and the second phase error of the voltage transformer under test at different frequencies and different primary voltages;
[0043] Determine the measurement error of the error calibrator 11 based on the first ratio error, the first phase error, the second ratio error, and the second phase error, where the measurement error of the error calibrator 11 includes the measurement error of the ratio error of the error calibrator 11 and the measurement error of the phase error of the error calibrator 11. After connecting the AC power supply to the frequency converter, connect it in parallel with the voltage regulating transformer and the step-up transformer to generate a target voltage with adjustable frequency. Connect the first primary winding terminals of the voltage transformer under test and the standard voltage transformer to the target voltage respectively, and short-circuit the second primary winding terminals to ground, where the voltage of the first primary winding terminal is higher than that of the second primary winding terminal;
[0044] Connect the secondary winding of the standard voltage transformer to one end of the error calibrator 11 as a reference signal. Short-circuit the first secondary winding terminals of the voltage transformer under test and the standard voltage transformer, and connect the second secondary winding terminals to the other end of the error calibrator 11, where the voltage of the first secondary winding terminal is higher than that of the second secondary winding terminal, forming a difference loop.
[0045] When using the device, install the transformer on the corresponding installation component 3 and send it to the storage slot 14 of the detection table 1. Connect the connecting wire of the transformer to the wire bundling component 5, and then connect it alternately with the error calibrator 11 and the lock-in amplifier 12 according to the wiring sequence for error calibration. When switching between the error calibrator 11 and the lock-in amplifier 12, switch through the wire bundling component 5 and the rotating component 6, and the wire bundling component 5 ensures that the connecting wires of the two transformers will not be entangled and piled up during the switching process.
[0046] In this embodiment, the mounting assembly 3 further includes a limiting block 36. Limiting blocks 36 are provided on both sides of the top of the receiving groove 14 and located on both sides of the bearing plate 34, and the limiting blocks 36 are in pressing contact with the bottom sides of the corresponding current transformers to be measured 4 and standard current transformers 41. A plug rod 37 is slidably inserted at a position corresponding to the back of the limiting block 36 on the detection table 1, and one end of the plug rod 37 is fixed to the limiting block 36. A first spring 38 is sleeved on the other end of the plug rod 37. An inclined surface 39 is formed at one end inside the bearing plate 34. An inclined plate 310 is provided inside the receiving groove 14 at a position corresponding to the inclined surface 39, and the inclined plate 310 slides along the inclined surface 39. Two ejector rods 311 are symmetrically and rotatably mounted at the top of the inclined plate 310 through a rotating shaft, and the tops of the ejector rods 311 are respectively rotatably connected to the limiting blocks 36 on both sides through a rotating shaft. Slide grooves 312 are formed on the inner walls of both sides of the receiving groove 14, and both ends of the inclined plate 310 slide inside the slide grooves 312. A spring is fixedly connected between the top of the slide groove 312 and the inclined plate 310. A baffle 33 is rotatably mounted at the outer end of the receiving groove 14 through a rotating shaft, and the other end of the baffle 33 is fixed to the detection table 1 through a bolt. Open the baffle 33, pull out the moving table 31 outward, install the current transformer in the placement groove 35 of the bearing plate 34, and then push the moving table 31 into the receiving groove 14. The inclined surface 39 of the bearing plate 34 presses against the inclined plate 310, and the inclined plate 310 moves upward along the slide groove 312, and the two limiting blocks 36 on both sides are moved closer to each other through the ejector rods 311 to clamp and limit the bottom of the current transformer. The baffle 33 blocks the outlet end of the receiving groove 14, so that the current transformer can be kept installed on the detection table 1. The movement of the limiting block 36 is controlled and guided by the plug rod 37 and the first spring 38.
[0047] In this embodiment, the wire bundling assembly 5 further includes a connecting plate 51. The connecting plate 51 is slidably inserted at the bottom of two groups of sliding plates 52. Spring telescopic rods 57 are fixedly arranged at equal intervals at the bottom of the connecting plate 51, and the receiving ends of the spring telescopic rods 57 are fixed inside the detection table 1. A connecting block 54 is fixed on one side of the sliding plate 52 corresponding to the bearing plate 34. A vertical rod 55 is fixed on the bearing plate 34, and one end of the connecting block 54 is slidably sleeved on the vertical rod 55. After the current transformer is installed in the mounting assembly 3, its connecting wire is connected to the spring clip 53 on the sliding plate 52 in the corresponding direction, and then sent to the detection position. During the detection process, the sliding plate 52 is at the bottommost position. When the connecting wire is separated from the error calibrator 11 and the phase-locked amplifier 12 after the detection is completed, the connecting wire is automatically lifted by the action of the spring telescopic rod 57, which is convenient for finding the connecting wire of the corresponding terminal during subsequent continuous detection, and can avoid the accumulation and entanglement of the connecting wire. The sliding plate 52 is pulled out together with the bearing plate 34 through the connecting block 54 and slides along the connecting plate 51. When the connecting plate 51 descends, the connecting block 54 slides on the vertical rod 55 to maintain connectivity.
[0048] In this embodiment, the rotating assembly 6 further includes a built-in telescopic rod 61. A built-in telescopic rod 61 is fixed to the bottom of the connecting block 54 on one side of the toothed plate 66 where the detection table 1 is located. The extending end of the built-in telescopic rod 61 passes through the detection table 1 and is fixed with a vertical block 62. A plug plate 63 is rotatably installed at the top of the vertical block 62 through a bearing. A slot 56 is formed in the connecting block 54 at the position corresponding to the plug plate 63. The other side of the vertical block 62 is rotatably connected to a connecting rod 64 through a rotating shaft, and the other end of the connecting rod 64 is rotatably connected to the back surface of the toothed plate 66 through a rotating shaft. A second spring 65 is fixed to the detection table 1 at the position corresponding to the toothed plate 66, and the other end of the second spring 65 is fixed to the toothed plate 66. The distance that the connecting plate 51 and the sliding plate 52 move from the lowest point to the highest point can just meet the requirement that the toothed plate 66 meshes with the toothed disc 67 to drive the toothed disc 67 to rotate 180 degrees, switching the positions of the error calibrator 11 and the lock-in amplifier 12. Before installing the mutual inductor, the plug plate 63 is not connected to the connecting block 54. After the installation of the mutual inductor is completed and the connecting wire of the mutual inductor is inserted into the spring clip 53, the connecting plate 51 is manually pressed to the bottommost position, compressing the spring telescopic rod 57. At this time, the length of the connecting wire just meets the requirement for plugging into the connection ends of the error calibrator 11 and the lock-in amplifier 12. At this time, the plug plate 63 passes through the slot 56, and then the plug plate 63 is rotated to be misaligned with the slot 56, thereby completing the locking connection between the vertical block 62 and the connecting block 54. After the subsequent detection is completed, when the connecting wire of the mutual inductor is manually separated from the error calibrator 11 and the lock-in amplifier 12, under the action of the elastic force of the spring telescopic rod 57, the connecting plate 51 is pushed upward, simultaneously driving the vertical block 62 to move upward, the built-in telescopic rod 61 extends, the connecting rod 64 pulls the toothed plate 66 to move, and the second spring 65 assists in pulling the toothed plate 66 to move and mesh with the toothed disc 67, and the toothed disc 67 rotates to switch the positions of the error calibrator 11 and the lock-in amplifier 12, facilitating subsequent secondary reference experiments.
[0049] When using the device, open the baffle 33, pull out the mobile station 31 outward, install the mutual inductor in the placement groove 35 of the bearing plate 34, and then push the mobile station 31 into the storage groove 14. The inclined surface 39 of the bearing plate 34 presses against the inclined plate 310, and the inclined plate 310 moves upward along the sliding groove 312. Through the ejector rod 311, the two limit blocks 36 are moved closer to each other to clamp and limit the bottom of the mutual inductor. By blocking the outlet end of the storage groove 14 with the baffle 33, the mutual inductor can be kept installed on the detection table 1. The movement of the limit block 36 is controlled and guided by the plug rod 37 and the first spring 38. After the mutual inductor is installed in the installation component 3, its connecting wire is connected to the spring clip 53 on the corresponding direction slide plate 52, and then sent to the detection position. During the detection process, the slide plate 52 is at the bottom. When the connecting wire is separated from the error calibrator 11 and the phase-locked amplifier 12 after the detection is completed, the connecting wire is automatically lifted by the action of the spring telescopic rod 57, which is convenient for finding the connecting wire of the corresponding terminal during subsequent continuous detection, and can avoid the accumulation and entanglement of the connecting wire. The slide plate 52 is pulled out together with the bearing plate 34 through the connecting block 54 and slides along the connecting plate 51. When the connecting plate 51 descends, the connecting block 54 slides along the vertical rod 55 to maintain connectivity. Before installing the mutual inductor, the plug plate 63 is not connected to the connecting block 54. After the mutual inductor is installed and the connecting wire of the mutual inductor is inserted into the spring clip 53, the connecting plate 51 is manually pressed to the bottom, compressing the spring telescopic rod 57. At this time, the length of the connecting wire just meets the requirement for plugging into the connection terminals of the error calibrator 11 and the phase-locked amplifier 12. At this time, the plug plate 63 passes through the slot 56, and then the plug plate 63 is rotated to be misaligned with the slot 56, thus completing the locking connection between the vertical block 62 and the connecting block 54. After the subsequent detection is completed, when the connecting wire of the mutual inductor is separated from the error calibrator 11 and the phase-locked amplifier 12 manually, under the action of the elastic force of the spring telescopic rod 57, the connecting plate 51 is pushed upward, and at the same time, the vertical block 62 is driven to move upward. The built-in telescopic rod 61 extends, and the connecting rod 64 pulls the toothed plate 66 to move. The second spring 65 assists in pulling the toothed plate 66 to move and engage with the toothed disc 67. The toothed disc 67 rotates to swap the positions of the error calibrator 11 and the phase-locked amplifier 12, which is convenient for subsequent secondary reference experiments.
[0050] The foregoing shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms.
[0051] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
[0052] Embodiment 2 of the present invention provides a method for calibrating the error of a voltage transformer. Based on the described voltage transformer error calibration device, it includes the following steps:
[0053] Step 1: Connect the voltage transformer 4 to be measured, the standard transformer 41, and the error calibrator 11 into a difference loop, and use the error calibrator 11 to measure the first ratio error and the first phase error of the voltage transformer under test at different frequencies and different primary voltages.
[0054] Step 2: Switch through the beam assembly 5 and the rotating assembly 6, disconnect the wiring of the error calibrator 11, connect the lock-in amplifier 12 into the difference loop, and use the lock-in amplifier 12 to measure the second ratio error and the second phase error of the voltage transformer under test at different frequencies and different primary voltages.
[0055] Step 3: Determine the measurement error of the error calibrator 11 according to the first ratio error, the first phase error, the second ratio error, and the second phase error.
[0056] Compared with the prior art, the beneficial effects of the present invention at least include:
[0057] 1. After the voltage transformer is installed and the connecting wire of the voltage transformer is inserted into the spring clip, manually press the connecting plate to the bottommost position, compress the spring telescopic rod. At this time, the length of the connecting wire just meets the connection with the connection terminals of the error calibrator and the lock-in amplifier. At this time, the insertion plate passes through the slot, and then rotate the insertion plate to misalign it with the slot, so as to complete the locking connection between the vertical block and the connecting block. When the connecting wire of the voltage transformer is separated from the error calibrator and the lock-in amplifier manually after the subsequent detection, under the action of the elastic force of the spring telescopic rod, the connecting plate is pushed upward, and at the same time, the vertical block is driven to move upward, the built-in telescopic rod extends, the connecting rod pulls the toothed plate to move, and the second spring assists in pulling the toothed plate to move and engage with the toothed disk. The toothed disk rotates to swap the positions of the error calibrator and the lock-in amplifier, which is convenient for subsequent secondary reference experiments.
[0058] 2. During the detection process of the present invention, the skateboard is at the bottommost position. When separating the connecting wire from the error calibrator and the phase-locked amplifier after the detection is completed, the connecting wire is automatically lifted by the action of the spring telescopic rod, which facilitates finding the connecting wire of the corresponding terminal during subsequent continuous detection, and can avoid the accumulation and entanglement of the connecting wire. The skateboard is pulled out together with the carrier plate through the connecting block and slides along the connecting plate. When the connecting plate descends, the connecting block slides along the vertical rod to maintain connectivity.
[0059] 3. The present invention installs the mutual inductor in the placement groove of the carrier plate. Subsequently, the moving platform is pushed into the storage groove. The inclined surface of the carrier plate squeezes the inclined plate, and the inclined plate moves upward along the sliding groove. The two limit blocks on both sides are pushed closer to each other through the ejector rod to clamp and limit the bottom of the mutual inductor. By blocking the outlet end of the storage groove with the baffle plate, the mutual inductor can be kept installed on the detection table. The movement of the limit block is controlled and guided by the insertion rod and the first spring, realizing the convenience of clamping and fixing the mutual inductor.
[0060] 4. Compared with the prior art, the present invention separates the connecting wires of the mutual inductor under test and the standard mutual inductor from each other through the cooperation of the wire bundling assembly and the rotating assembly, avoiding the problems of entanglement and disorder. And it is alternately connected to the error calibrator and the phase-locked amplifier. While performing multiple data calibrations, it can dredge multiple connecting wires, improving the efficiency and convenience of error calibration.
[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the specific implementation manners of the present invention can still be modified or equivalently replaced. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.
Claims
1. A voltage transformer error calibration device, including a detection table (1), characterized in that: An output box (2) is fixed on one side of the detection table (1). On the top of the other side of the detection table (1), a toothed disc (67) is installed through a bearing. An error calibrator (11) and a lock-in amplifier (12) are symmetrically installed on the top surface of the toothed disc (67). The connection ends of the error calibrator (11) and the lock-in amplifier (12) face opposite directions for the detection and calibration of the voltage transformer. An installation component (3) is provided between the detection table (1) and the output box (2). The installation component (3) includes a storage groove (14). A moving table (31) is arranged inside the storage groove (14). A bearing plate (34) is fixed on the top of the moving table (31). A placement groove (35) is fixed on the top of the bearing plate (34). A to-be-tested transformer (4) and a standard transformer (41) are respectively placed in the placement groove (35). A wire bundling component (5) is installed on the surface of the detection table (1) between the installation component (3) and the toothed disc (67). The wire bundling component (5) includes two groups of sliding plates (52). Two groups of spring clips (53) are rotatably installed on the top of the sliding plates (52). The connecting wires of the to-be-tested transformer (4) and the standard transformer (41) pass through the spring clips (53) and are connected to the error calibrator (11) and the lock-in amplifier (12). A rotating component (6) is provided on one side of the detection table (1) where the toothed disc (67) is located. The rotating component (6) includes a toothed plate (66). The toothed plate (66) slides along the surface of the detection table (1), and the toothed plate (66) is meshed with the outer side of the toothed disc (67). A grounding terminal (13) is installed on the surface of the detection table (1) between the output box (2) and the installation component (3).
2. The voltage transformer error calibration device according to claim 1, characterized in that: Guide rails (32) are fixed on both sides of the inner wall of the storage groove (14) corresponding to the bottom of the bearing plate (34). The bearing plate (34) slides along the guide rails (32).
3. The voltage transformer error calibration device according to claim 1, characterized in that: The installation component (3) further includes a limiting block (36). Limiting blocks (36) are provided on both sides of the top of the storage groove (14) where the bearing plate (34) is located, and the limiting blocks (36) are in pressing contact with the bottom sides of the corresponding to-be-tested transformer (4) and standard transformer (41). A plug rod (37) is slidably inserted at a position on the detection table (1) corresponding to the back of the limiting block (36), and one end of the plug rod (37) is fixed to the limiting block (36). A first spring (38) is sleeved on the other end of the plug rod (37).
4. The voltage transformer error calibration device according to claim 3, characterized in that: One end inside the bearing plate (34) is provided with an inclined surface (39). An inclined plate (310) is provided at a position corresponding to the inclined surface (39) inside the storage groove (14), and the inclined plate (310) slides along the inclined surface (39). Two ejector rods (311) are symmetrically and rotatably installed at the top of the inclined plate (310) through a rotating shaft, and the tops of the ejector rods (311) are respectively rotatably connected to the limiting blocks (36) on both sides through a rotating shaft.
5. The voltage transformer error calibration device according to claim 4, wherein: Sliding grooves (312) are formed on the inner walls on both sides of the storage groove (14), and both ends of the inclined plate (310) slide inside the sliding grooves (312). A spring is fixedly connected between the top of the sliding groove (312) and the inclined plate (310).
6. The voltage transformer error calibration device according to claim 1, wherein: One end of the storage groove (14) is rotatably installed with a baffle plate (33) through a rotating shaft, and the other end of the baffle plate (33) is fixed on the detection table (1) through a bolt.
7. The voltage transformer error calibration device according to claim 6, wherein: The wire bundling assembly (5) further includes a connecting plate (51). The bottoms of the two groups of sliding plates (52) are slidably inserted with the connecting plate (51). The bottom of the connecting plate (51) is equidistantly fixed with spring telescopic rods (57), and the receiving ends of the spring telescopic rods (57) are fixed inside the detection table (1).
8. The voltage transformer error calibration device according to claim 7, wherein: A connecting block (54) is fixed on one side of the sliding plate (52) corresponding to the bearing plate (34). A vertical rod (55) is fixed on the bearing plate (34), and one end of the connecting block (54) is slidably sleeved on the vertical rod (55).
9. The voltage transformer error calibration device according to claim 8, wherein: The rotating assembly (6) further includes a built-in telescopic rod (61). A built-in telescopic rod (61) is fixed at the bottom of the connecting block (54) on one side of the detection table (1) corresponding to the toothed plate (66). The extending end of the built-in telescopic rod (61) passes through the detection table (1) and is fixed with a vertical block (62). A plug board (63) is rotatably installed at the top of the vertical block (62) through a bearing. A slot (56) is formed at the position of the connecting block (54) corresponding to the plug board (63).
10. The voltage transformer error calibration device according to claim 9, wherein: The other side of the vertical block (62) is rotatably connected with a connecting rod (64), and the other end of the connecting rod (64) is rotatably connected to the back surface of the toothed plate (66) through a rotating shaft.
11. The voltage transformer error calibration device according to claim 9, wherein: A second spring (65) is fixed on the detection table (1) corresponding to the toothed plate (66), and the other end of the second spring (65) is fixedly connected to the toothed plate (66).
12. A voltage transformer error calibration method, based on the voltage transformer error calibration device according to any one of claims 1-11, wherein: It includes the following steps: Connect the current transformer under test (4), the standard current transformer (41) and the error calibrator (11) to form a differential circuit, and use the error calibrator (11) to measure the first ratio error and the first phase error of the voltage transformer under test at different frequencies and different primary voltages; Switch through the beam line assembly (5) and the rotating assembly (6), disconnect the connection of the error calibrator (11), connect the lock-in amplifier (12) to the differential circuit, and use the lock-in amplifier (12) to measure the second ratio error and the second phase error of the voltage transformer under test at different frequencies and different primary voltages; Determine the measurement error of the error calibrator (11) according to the first ratio error, the first phase error, the second ratio error and the second phase error.