Universal type current transformer multiplying power checking device and method

Abstract

The invention belongs to the field of current transformer checking, and provides a universal type current transformer multiplying power checking device and method.The universal type current transformer multiplying power checking device comprises a checking table, a primary winding assembly and a secondary winding assembly, the checking table is provided with a containing groove, the containing groove is used for containing a core penetrating type current transformer, and the checking table is provided with a control panel; the primary winding assembly is installed on the checking table, and the middle part of the primary winding assembly detachably passes through the core-through current transformer. According to the invention, after the through-core current transformer is placed in the placement groove and is fixed by the clamping mechanism, the output end of the through-core current transformer can be connected with a control panel through the secondary winding wiring mechanism, and then the primary winding assembly passes through the through-core current transformer, so that the through-core current transformer can be connected with the output end of the through-core current transformer. During measurement, a worker can be far away from the core-penetrating type current transformer, so that possible dangers are avoided.

Description

Technical Field

[0001] The invention belongs to the field of current transformer calibration, and in particular relates to a universal current transformer ratio calibration device and method. Background Art

[0002] In recent years, in order to meet the needs of economic development, the capacity of generators and transformers has continued to increase, the voltage level of transmission lines has become higher and higher, and the current of transmission lines has also increased accordingly. When measuring large currents, for the safety of people and instruments, the large current will first be reduced to a small current through a current transformer, and then the current will be measured using instruments such as ammeters.

[0003] The current transformer is an instrument that converts a large primary current into a small secondary current based on the principle of electromagnetic induction. The current transformer is composed of a closed iron core and a winding. Its primary winding has a small number of turns and is connected in series in the circuit of the current to be measured. The secondary winding has a large number of turns and is connected in series in the measuring instrument and protection circuit.

[0004] In order to make the measurement of large current more accurate, it is necessary to clarify the ratio between the large current and the small current of the current transformer. Therefore, before the current transformer leaves the factory, its ratio is usually calibrated. It can only leave the factory after its ratio is qualified to avoid damage to electrical equipment.

[0005] The existing measurement of current transformers is usually done manually. During the measurement, the staff will pass the wire as the primary winding through the center of the current transformer and provide a large current to the wire. Then, the two needles of the ammeter are respectively connected to the S1 and S2 ends of the secondary winding of the current transformer. The ammeter can then measure the current output by the secondary winding of the current transformer. By comparing it with the current of the input wire, the multiplier of the current transformer can be obtained.

[0006] This method requires the staff to manually pass the wire through the current transformer and connect it to the power supply device. The operation is more cumbersome, and when measuring the current of the secondary winding, the staff needs to be close to the current transformer. After applying a large current to the current transformer, there will be certain dangers around it. If the staff does not operate properly, it may cause harm to the staff. Summary of the invention

[0007] The object of the present invention is to provide a universal current transformer ratio calibration device and method, aiming to solve the technical problems of operation trouble and possible danger caused by manual measurement of current transformer in the prior art.

[0008] The present invention is implemented as follows: a universal current transformer multiplier calibration device includes a calibration platform, a placement slot is provided on the calibration platform, the placement slot is used to place the through-core current transformer, a control panel is provided on the calibration platform, and the control panel integrates an ammeter, a current control module, a data processing module, and a display screen, etc., and also includes: A primary winding assembly, the primary winding assembly is mounted on a calibration platform, the middle portion of the primary winding assembly can be detachably passed through a through-core current transformer, the two ends of the primary winding assembly are respectively electrically connected to the positive and negative poles of an external power supply device, the control panel is serially connected in the circuit of the primary winding assembly, and when the primary winding assembly is powered on, the primary winding assembly is used to provide an electromagnetic field for the through-core current transformer; A clamping mechanism, which is mounted on a calibration platform and is used to fix the through-core current transformer in the placement slot; A secondary winding connection mechanism is installed on a calibration platform, two input ends of the secondary winding connection mechanism can be connected to two secondary winding output ends (S1 end and S2 end) of a through-core current transformer respectively, and the output end of the secondary winding connection mechanism is electrically connected to a control panel. The secondary winding connection mechanism is used to electrically connect the through-core current transformer and the control panel, so that the control panel can detect the current output by the through-core current transformer and compare it with the current flowing in the primary winding assembly, thereby obtaining the multiplier of the conversion current of the through-core current transformer. By controlling the current size in the primary winding assembly, multiple groups of comparative experiments can be performed, thereby making the calibration result more accurate.

[0009] Further technical solution: the primary winding assembly includes two mounting seats, the two mounting seats are respectively fixedly mounted on the calibration platform on both sides of the through-core current transformer, the two mounting seats are rotatably connected with a take-up drum, the two take-up drums are wound with winding wires, both ends of the calibration platform are fixedly connected with columns, the tops of the two columns are rotatably connected with guide pulleys, one end of one winding wire passing around the guide pulley is connected to a left terminal, and the other end of the winding wire passing around the guide pulley is connected to a right terminal, the left terminal and the right terminal can pass through the middle of the through-core current transformer and be electrically connected; In order to facilitate the collection of winding wires, an elastic winding box is fixedly connected to the mounting seat, and a torsion spring (not shown) is arranged inside the elastic winding box. The output end of the torsion spring is connected to one end of the take-up drum. Initially, the winding wires are all wound on the take-up drum.

[0010] Further technical solution: an electrode cylinder is embedded in the end of the left terminal, the electrode cylinder is electrically connected to one end of a winding wire, an electrode column is provided at the end of the right terminal, the electrode column is electrically connected to one end of another winding wire, the electrode column can be inserted into the electrode cylinder and electrically connected to the electrode cylinder; In order to prevent the left and right wiring terminals from loosening, a clamping slot is provided at the end of the left wiring terminal, and a clamping block is fixedly connected to the end of the right wiring terminal, and the clamping block can be clamped in the clamping slot.

[0011] Further technical solution: the primary winding assembly further comprises two support cylinders, the two support cylinders are respectively fixedly connected to opposite sides of the two columns, and the ends of the left terminal and the right terminal can be respectively inserted into the two support cylinders; In order to facilitate the smooth insertion of the left wiring terminal and the right wiring terminal into the support tube, a bell mouth is provided at the end of the support tube close to the through-core current transformer.

[0012] Further technical solution: the clamping mechanism includes a second installation cavity opened inside the calibration platform, the second installation cavity is communicated with the placement slot, a second slider is slidably connected inside the second installation cavity, both ends of the side of the second slider close to the placement slot are slidably connected with a transverse block, a third compression spring is connected between the transverse block and the second slider, one end of the transverse block extends to the inside of the placement slot, the transverse block can reinforce the mounting plate at the bottom of the through-core current transformer, the opposite sides of the two transverse blocks are slidably connected with a clamping block, a second compression spring is connected between the clamping block and the transverse block, and the clamping block is used to clamp the side of the through-core current transformer; A second screw is rotatably connected inside the second installation cavity, the second screw is threadedly connected to the second slider, one end of the second screw extends out of the calibration platform, and the second screw can be adjusted manually or automatically by setting a motor; In order to enable the clamping mechanism to automatically clamp the through-core current transformer, the clamping mechanism also includes two guide wedge blocks, which are respectively arranged on the two side walls of the placement groove. When the second slider drives the transverse block to move, it is squeezed by the guide wedge blocks, and the transverse block drives the clamping block to approach the through-core current transformer, and then the clamping block clamps the through-core current transformer. Due to the setting of the second compression spring, the clamping mechanism can clamp through-core current transformers of different models, making the device more versatile.

[0013] Further technical solution: The secondary winding connection mechanism includes a first installation cavity opened inside the calibration platform, a first slider is slidably connected inside the first installation cavity, a telescopic block is fixedly connected to the side of the first slider close to the placement slot, one end of the telescopic block is slidably connected to the installation block, a first compression spring is connected between the installation block and the telescopic block, one end of the installation block extending into the placement slot is fixedly connected to a fixing frame, a lifting frame is vertically slidably connected to the fixing frame, the top of the lifting frame is rotatably connected to a first screw, the first screw is threadedly connected to the fixing frame, and the lifting frame is fixedly connected to the first screw. The frame is horizontally slidably connected to two adjustment blocks, the lifting frame is rotatably connected to a double-headed screw, the two ends of the double-headed screw are respectively threadedly connected to the two adjustment blocks, one end of the double-headed screw extends out of a fixing frame, the fixing frame is provided with a slit for the double-headed screw to move, the two adjustment blocks are fixedly connected to fixed columns on the sides close to the through-core current transformer, one end of the two fixing columns are fixedly connected to elastic spiral telescopic rods, the ends of the elastic spiral telescopic rods are fixedly connected to abutment joints, and the two elastic spiral telescopic rods are electrically connected to the ammeter in the control panel through wires; The elastic spiral telescopic rod is formed by winding an elastic metal spirally, the elastic spiral telescopic rod is tapered as a whole, and the abutment joint is also made of metal material; In order to avoid setting up an additional power source, the secondary winding connection mechanism also includes a linkage mechanism, which is installed in the first installation cavity, one end of the linkage mechanism is connected to the first slider, and the other end of the linkage mechanism passes through the calibration table and is connected to the second slider. When the second slider moves, the linkage mechanism is used to drive the first slider to move in the opposite direction.

[0014] Further technical solution: The linkage mechanism includes an intermediate gear rotatably connected to the inside of the first mounting cavity, a first rack is fixedly connected to the side of the second slider, one end of the first rack extending into the first mounting cavity is meshed with the intermediate gear, one end of the first slider is fixedly connected to the second rack, the second rack is meshed with the intermediate gear, and the first rack and the second rack are respectively located on both sides of the intermediate gear.

[0015] Further technical solution: The secondary winding connection mechanism also includes a warning light, a switch and an independent battery (not shown). The warning light, the switch and the independent battery are all installed on the lifting frame. The two ends of the switch are electrically connected to the two elastic spiral telescopic rods respectively, so that the secondary winding on the through-core current transformer, the two elastic spiral telescopic rods, the warning light, the independent battery and the switch form a complete circuit. When the two elastic spiral telescopic rods are respectively connected to the S1 terminal hole and the S2 terminal hole, the switch is turned on, the circuit becomes a passage, and the warning light is on. When the circuit between the S1 terminal hole and the S2 terminal hole is open, the switch is turned on, the circuit is still open, and the warning light is not on, indicating that the two elastic spiral telescopic rods are not in contact with the S1 terminal hole or the S2 terminal hole. The circuit can be checked and the experiment can be continued. The setting of this structure can avoid the danger caused by the open circuit at the output end of the secondary winding on the through-core current transformer.

[0016] The method for using the above-mentioned universal current transformer ratio calibration device comprises the following steps: S01: Place the core-through current transformer into the placement slot; S02: The through-core current transformer is fixed by a clamping mechanism. At the same time, the clamping mechanism drives the secondary winding connection mechanism to contact the output end of the through-core current transformer through the linkage mechanism; the second screw is rotated, and the second screw drives the second slider to move, and the second slider drives the transverse block and the clamping block to move. Under the action of the guide wedge block, the transverse block drives the clamping block to approach the middle position of the second slider, and then the two clamping blocks clamp the through-core current transformer. When the second slider moves, the second slider drives the intermediate gear to rotate through the first rack, and the intermediate gear drives the second rack and the first slider in the opposite direction. The first slider drives the mounting block and the elastic spiral telescopic rod to move through the telescopic block and the first compression spring, so that the two elastic spiral telescopic rods are respectively inserted into the S1 end hole and the S2 end hole; when the model of the through-core current transformer is changed, the positions of the S1 end hole and the S2 end hole may be changed. At this time, the horizontal distance between the two elastic spiral telescopic rods can be adjusted by rotating the double-headed screw, and the height of the elastic spiral telescopic rod can be adjusted by rotating the first screw, so that the secondary winding connection mechanism can adapt to the output end of the through-core current transformer of different models, and the device has a wider range of applications; S03: Check whether there is an open circuit between the input end of the secondary winding connection mechanism and the output end of the through-core current transformer. If there is an open circuit, continue to adjust the position of the input end of the secondary winding connection mechanism until they are connected; turn on the switch and observe whether the warning light is on. If the warning light is on, it means that the input end of the secondary winding connection mechanism and the output end of the through-core current transformer are in good contact. If the warning light is not on, it means that there is an open circuit between the input end of the secondary winding connection mechanism and the output end of the through-core current transformer. Adjust the position of the elastic spiral telescopic rod until the warning light is on; S04: Pass the middle of the primary winding assembly through the through-core current transformer; pull up the left terminal and the right terminal with both hands, so that both the left terminal and the right terminal pass through the through-core current transformer, and connect the ends of the left terminal and the right terminal; S05: The current I1 input to the primary winding assembly is controlled through the control panel, and the current I2 flowing out of the S1 terminal hole on the through-core current transformer is measured using the control panel. The multiplier of the through-core current transformer is I1 / I2; the current of the primary winding assembly can be continuously changed, so that multiple groups of experiments can be performed to make the experimental results more accurate.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, after placing the through-core current transformer in the placement slot and fixing the through-core current transformer by using a clamping mechanism, the output end of the through-core current transformer can be connected to the control panel through the secondary winding connection mechanism, and then the primary winding assembly is passed through the through-core current transformer, and then the primary winding assembly is powered. During measurement, the staff can stay away from the through-core current transformer, avoiding possible dangers; 2. The present invention cuts off the winding wire and adds a left wiring terminal and a right wiring terminal. The worker can hold the left wiring terminal and the right wiring terminal with both hands to make connections, without direct contact with the power supply device or passing the wire directly through the core-through current transformer, which makes the operation simpler. 3. The present invention provides two support tubes, and the left terminal and the right terminal are respectively inserted into the two support tubes, so that the left terminal and the right terminal are placed horizontally. When the left terminal and the right terminal are connected again, compared with the left terminal and the right terminal falling naturally, and then picking up the left terminal and the right terminal, the device allows the staff to easily pick up the left terminal and the right terminal. The device makes it easier to replace the through-core current transformer, shortens the replacement time, and improves the verification efficiency; 4. The present invention provides an elastic spiral telescopic rod and an abutment joint, so that the abutment joint and the elastic spiral telescopic rod can be respectively inserted into the S1 end hole and the S2 end hole. When the abutment joint is blocked, the elastic spiral telescopic rod contracts under pressure, so that the outer wall of the elastic spiral telescopic rod can contact the inner wall of the S1 end hole (or the S2 end hole), thereby increasing the contact area between the elastic spiral telescopic rod and the output end of the through-core current transformer, and improving the accuracy of the calibration of the through-core current transformer. Moreover, when the model of the through-core current transformer changes, the diameters of the S1 end hole and the S2 end hole will also change accordingly, and the elastic spiral telescopic rod of the device can adapt to different hole diameters; 5. The present invention provides a linkage mechanism. When the clamping mechanism clamps the through-core current transformer, the linkage mechanism also drives the secondary winding connection mechanism to contact the output end of the through-core current transformer, thereby avoiding the need for an additional power device and reducing the operation steps, making the device easier to operate. 6. The present invention provides a warning light, a switch and an independent battery. After the secondary winding connection mechanism contacts the output end of the through-core current transformer, the switch can be turned on to check whether the secondary winding output end of the through-core current transformer is open, thereby avoiding possible dangers. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 For the present invention Figure 1 Enlarged schematic diagram at point A in the middle.

[0020] Figure 3 It is a schematic diagram of the end structure of the left connecting terminal in the present invention.

[0021] Figure 4 It is a schematic diagram of the end structure of the right connecting terminal in the present invention.

[0022] Figure 5 It is a schematic diagram of the cross-sectional structure of the present invention as a whole.

[0023] Figure 6 It is a schematic diagram of the cross-sectional structure of the clamping mechanism in the present invention.

[0024] Figure 7 It is a structural schematic diagram of the secondary winding connection mechanism in the present invention.

[0025] Figure 8 For the present invention Figure 7 Enlarged schematic diagram of point B in the middle.

[0026] Fig. 9 It is a schematic structural diagram of the elastic spiral telescopic rod in the present invention.

[0027] In the attached drawings: 1. Checking table; 2. Through-core current transformer; 3. Primary winding assembly; 31. Right terminal; 32. Mounting seat; 33. Elastic winding box; 34. Winding reel; 35. Winding wire; 36. Column; 37. Guide pulley; 38. Support cylinder; 39. Left terminal; 310. Card slot; 311. Electrode cylinder; 312. Electrode column; 313. Card block; 4. Placement slot; 5. Secondary winding connection mechanism; 51. Mounting block; 52. Telescopic block; 53. First slider; 54. First mounting cavity; 55. First compression spring; 56. Fixed column; 57, elastic spiral telescopic rod; 58, abutment; 59, first screw; 510, lifting frame; 511, adjustment block; 512, fixed frame; 513, double-headed screw; 514, switch; 515, warning light; 6, control panel; 7, clamping mechanism; 71, second screw; 72, second mounting cavity; 73, second slider; 74, transverse block; 75, clamping block; 76, guide wedge block; 77, second compression spring; 78, third compression spring; 8, linkage mechanism; 81, first rack; 82, second rack; 83, intermediate gear. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0030] Embodiment 1 like Figure 1-Figure 9 As shown, a universal current transformer multiplier calibration device provided by the present invention includes a calibration platform 1, a placement slot 4 is provided on the calibration platform 1, and the placement slot 4 is used to place the through-core current transformer 2. A control panel 6 is provided on the calibration platform 1, and the control panel 6 integrates an ammeter, a current control module, a data processing module, and a display screen, etc., and also includes: A primary winding assembly 3, wherein the primary winding assembly 3 is mounted on a calibration platform 1, wherein the middle portion of the primary winding assembly 3 can be detachably passed through a through-core current transformer 2, wherein both ends of the primary winding assembly 3 are electrically connected to the positive and negative electrodes of an external power supply device, respectively, and the control panel 6 is connected in series in the circuit of the primary winding assembly 3, wherein when the primary winding assembly 3 is powered on, the primary winding assembly 3 is used to provide an electromagnetic field for the through-core current transformer 2; A clamping mechanism 7, wherein the clamping mechanism 7 is installed on the calibration platform 1, and the clamping mechanism 7 is used to fix the through-core current transformer 2 in the placement slot 4; A secondary winding connection mechanism 5, wherein the secondary winding connection mechanism 5 is installed on the calibration platform 1, wherein the two input ends of the secondary winding connection mechanism 5 can be respectively connected to the two secondary winding output ends (S1 end and S2 end) of the through-core current transformer 2, and the output end of the secondary winding connection mechanism 5 is electrically connected to the control panel 6, wherein the secondary winding connection mechanism 5 is used to electrically connect the through-core current transformer 2 and the control panel 6, so that the control panel 6 can detect the current output by the through-core current transformer 2 and compare it with the current flowing in the primary winding assembly 3, thereby obtaining the conversion ratio of the through-core current transformer 2, and by controlling the current size in the primary winding assembly 3, multiple groups of comparative experiments can be performed, thereby making the calibration result more accurate.

[0031] The device places a through-core current transformer 2 in a placement slot 4, fixes the through-core current transformer 2 with a clamping mechanism 7, connects the output end of the through-core current transformer 2 to a control panel 6 through a secondary winding connection mechanism 5, passes a primary winding assembly 3 through the through-core current transformer 2, and then supplies power to the primary winding assembly 3. During measurement, the staff can stay away from the through-core current transformer 2, thus avoiding possible dangers.

[0032] like Figure 1-Figure 4 As shown, a universal current transformer multiplier calibration device provided by the present invention, in this embodiment, the primary winding assembly 3 includes two mounting seats 32, the two mounting seats 32 are respectively fixedly mounted on the calibration platform 1 on both sides of the through-core current transformer 2, the two mounting seats 32 are rotatably connected with a take-up drum 34, the two take-up drums 34 are wound with winding wires 35, both ends of the calibration platform 1 are fixedly connected with columns 36, the tops of the two columns 36 are rotatably connected with guide pulleys 37, one end of the winding wire 35 passing around the guide pulley 37 is connected to a left terminal 39, and the other end of the winding wire 35 passing around the guide pulley 37 is connected to a right terminal 31, the left terminal 39 and the right terminal 31 can pass through the middle of the through-core current transformer 2 and be electrically connected; In order to facilitate the collection of the winding wire 35, an elastic winding box 33 is fixedly connected to the mounting seat 32, and a torsion spring (not shown) is arranged inside the elastic winding box 33. The output end of the torsion spring is connected to one end of the take-up reel 34. Initially, the winding wire 35 is completely wound on the take-up reel 34.

[0033] The device cuts off the winding wire 35 and adds a left terminal 39 and a right terminal 31. The staff can hold the left terminal 39 and the right terminal 31 with both hands to make connections. There is no need to directly contact the power supply device or pass the wire directly through the core-through current transformer 2, which makes the operation simpler.

[0034] like Figure 1-Figure 4 As shown, a universal current transformer multiplier calibration device provided by the present invention is provided. In order to facilitate the electrical connection between the left terminal 39 and the right terminal 31, in this embodiment, an electrode cylinder 311 is embedded at the end of the left terminal 39, and the electrode cylinder 311 is electrically connected to one end of a winding wire 35. An electrode column 312 is provided at the end of the right terminal 31, and the electrode column 312 is electrically connected to one end of another winding wire 35. The electrode column 312 can be inserted into the electrode cylinder 311 and electrically connected to the electrode cylinder 311. In order to prevent the left terminal 39 and the right terminal 31 from loosening, a slot 310 is provided at the end of the left terminal 39 , and a clamping block 313 is fixedly connected to the end of the right terminal 31 , and the clamping block 313 can be clamped in the slot 310 .

[0035] like Figure 1-Figure 4 As shown, a universal current transformer multiplier calibration device provided by the present invention is provided. In order to improve the calibration efficiency and make it easier for the device to replace the through-core current transformer 2, in this embodiment, the primary winding assembly 3 also includes two support cylinders 38, and the two support cylinders 38 are respectively fixedly connected to the opposite sides of the two columns 36, and the ends of the left terminal 39 and the right terminal 31 can be respectively inserted into the two support cylinders 38; When replacing the through-core current transformer 2, loosen the left terminal 39 and the right terminal 31, and under the pull of the torsion spring, the winding reel 34 reels the winding wire 35, and the winding wire 35 drives the left terminal 39 and the right terminal 31 to separate from each other, and then the left terminal 39 and the right terminal 31 are respectively inserted into the two support cylinders 38, so that the left terminal 39 and the right terminal 31 are placed horizontally, and when the left terminal 39 and the right terminal 31 are connected again, compared with the natural drooping of the left terminal 39 and the right terminal 31, and then the left terminal 39 and the right terminal 31 are picked up, the device allows the staff to easily pick up the left terminal 39 and the right terminal 31, and then pass the ends of the left terminal 39 and the right terminal 31 through the center of the through-core current transformer 2 and dock them together, and finally the two hands rotate in opposite directions to make the block 313 stuck in the slot 310, so that the left terminal 39 and the right terminal 31 are connected more firmly; In order to facilitate the left wiring terminal 39 and the right wiring terminal 31 to be smoothly inserted into the support tube 38 , a bell mouth is provided at the end of the support tube 38 close to the through-core current transformer 2 .

[0036] like Figure 5-Figure 6As shown, a universal current transformer multiplier calibration device provided by the present invention, in this embodiment, the clamping mechanism 7 includes a second mounting cavity 72 opened inside the calibration platform 1, the second mounting cavity 72 is communicated with the placement slot 4, the second mounting cavity 72 is slidably connected with a second slider 73, the second slider 73 is slidably connected with a transverse block 74 at both ends of the side close to the placement slot 4, a third compression spring 78 is connected between the transverse block 74 and the second slider 73, one end of the transverse block 74 extends to the inside of the placement slot 4, the transverse block 74 can reinforce the mounting plate at the bottom of the through-core current transformer 2, the two opposite sides of the two transverse blocks 74 are slidably connected with a clamping block 75, a second compression spring 77 is connected between the clamping block 75 and the transverse block 74, and the clamping block 75 is used to clamp the side of the through-core current transformer 2; A second screw 71 is rotatably connected inside the second mounting cavity 72, and the second screw 71 is threadedly connected to a second slider 73. One end of the second screw 71 extends out of the calibration platform 1. The second screw 71 can be adjusted manually or automatically by a motor. In order to enable the clamping mechanism 7 to automatically clamp the through-core current transformer 2, the clamping mechanism 7 also includes two guide wedge blocks 76, and the two guide wedge blocks 76 are respectively arranged on the two side walls of the placement groove 4. When the second slider 73 drives the transverse block 74 to move, it is squeezed by the guide wedge blocks 76, and the transverse block 74 drives the clamping block 75 to approach the through-core current transformer 2, and then the clamping block 75 clamps the through-core current transformer 2. Due to the setting of the second compression spring 77, the clamping mechanism 7 can clamp different types of through-core current transformers 2, so that the versatility of the device is better.

[0037] like Figure 5 and Figure 7-Figure 9As shown, a universal current transformer ratio calibration device provided by the present invention is provided. In this embodiment, the secondary winding connection mechanism 5 includes a first installation cavity 54 opened inside the calibration platform 1, and the first installation cavity 54 is slidably connected to the inside of the first sliding block 53, and the first sliding block 53 is fixedly connected to the side of the placement slot 4, and one end of the telescopic block 52 is slidably connected to the installation block 51, and a first compression spring 55 is connected between the installation block 51 and the telescopic block 52. The end of the installation block 51 extending into the placement slot 4 is fixedly connected to a fixing frame 512, and a lifting frame 510 is vertically slidably connected to the fixing frame 512, and the top of the lifting frame 510 is rotatably connected to a first screw 59, and the first screw 59 is threadedly connected to On the fixed frame 512, the lifting frame 510 is connected to two adjusting blocks 511 for horizontal sliding inside, and the lifting frame 510 is rotatably connected to a double-headed screw 513, and the two ends of the double-headed screw 513 are respectively threadedly connected to the two adjusting blocks 511, and one end of the double-headed screw 513 extends out of the fixed frame 512, and the fixed frame 512 is provided with a slit for the double-headed screw 513 to move. The sides of the two adjusting blocks 511 close to the through-core current transformer 2 are fixedly connected to a fixing column 56, and one end of the two fixing columns 56 is fixedly connected to an elastic spiral telescopic rod 57, and the end of the elastic spiral telescopic rod 57 is fixedly connected to a butt joint 58, and the two elastic spiral telescopic rods 57 are electrically connected to the ammeter in the control panel 6 through a wire; The elastic spiral telescopic rod 57 is made of an elastic metal spirally wound, and the elastic spiral telescopic rod 57 is tapered as a whole. The abutment head 58 is also made of metal material. In the prior art, the secondary winding output end of the through-core current transformer 2 is connected to the wire in the following manner: the bare wire after stripping is wound around a conductive screw, and then the conductive screw is screwed into the S1 terminal hole and the S2 terminal hole on the through-core current transformer 2; There are two ways to connect this device: When the conductive screws are not screwed down, the two abutting joints 58 are respectively abutted against the two conductive screws, so that the secondary winding output end of the through-core current transformer 2 can be electrically connected to the control panel 6; After the conductive screw is unscrewed, the abutment joint 58 and the elastic spiral telescopic rod 57 can be inserted into the S1 end hole and the S2 end hole respectively. When the abutment joint 58 is blocked, the elastic spiral telescopic rod 57 contracts under pressure, so that the outer wall of the elastic spiral telescopic rod 57 can contact the inner wall of the S1 end hole (S2 end hole), thereby increasing the contact area between the elastic spiral telescopic rod 57 and the output end of the through-core current transformer 2, thereby improving the accuracy of the calibration of the through-core current transformer 2. Moreover, when the model of the through-core current transformer 2 is changed, the diameters of its S1 end hole and S2 end hole will also change accordingly, and the elastic spiral telescopic rod 57 of the device can adapt to different hole diameters; When the through-core current transformer 2 is thick, after the elastic spiral telescopic rod 57 is blocked, the telescopic block 52 will continue to squeeze the first compression spring 55 to deform and retract into the mounting block 51 to avoid affecting the movement of the second slider 73; In order to avoid setting up an additional power source, the secondary winding connection mechanism 5 also includes a linkage mechanism 8, which is installed in the first installation cavity 54, one end of the linkage mechanism 8 is connected to the first slider 53, and the other end of the linkage mechanism 8 passes through the calibration table 1 and is connected to the second slider 73. When the second slider 73 moves, the linkage mechanism 8 is used to drive the first slider 53 to move in the opposite direction.

[0038] like Figure 5-Figure 8 As shown, a universal current transformer ratio calibration device is provided by the present invention. In this embodiment, the linkage mechanism 8 includes an intermediate gear 83 rotatably connected to the inside of the first mounting cavity 54, and the side of the second slider 73 is fixedly connected with a first rack 81. One end of the first rack 81 extending into the first mounting cavity 54 is meshed with the intermediate gear 83. One end of the first slider 53 is fixedly connected with a second rack 82, and the second rack 82 is meshed with the intermediate gear 83. The first rack 81 and the second rack 82 are respectively located on both sides of the intermediate gear 83.

[0039] like Figure 7-Figure 8As shown, a universal current transformer multiplier calibration device provided by the present invention is provided. In order to avoid the secondary winding output end of the through-core current transformer 2 from being open-circuited, in this embodiment, the secondary winding wiring mechanism 5 also includes a warning light 515, a switch 514 and an independent battery (not shown). The warning light 515, the switch 514 and the independent battery are all installed on the lifting frame 510, and the two ends of the switch 514 are respectively electrically connected to the two elastic spiral telescopic rods 57, so that the secondary winding on the through-core current transformer 2, the two elastic spiral telescopic rods 57, the warning light 515 and the independent battery are electrically connected to the two elastic spiral telescopic rods 57. 5. The independent battery and the switch 514 form a complete circuit. When the two elastic spiral telescopic rods 57 are respectively connected to the S1 terminal hole and the S2 terminal hole, the switch 514 is turned on, the circuit becomes open, and the warning light 515 lights up. When the circuit between the S1 terminal hole and the S2 terminal hole is open, the switch 514 is turned on, the circuit is still open, and the warning light 515 is not on, indicating that the two elastic spiral telescopic rods 57 are not in contact with the S1 terminal hole or the S2 terminal hole. The circuit can be checked and the experiment can be continued. The setting of this structure can avoid the danger caused by the open circuit of the secondary winding output end on the through-core current transformer 2.

[0040] Directions: S01: Place the core-through current transformer 2 into the placement slot 4; S02: The through-core current transformer 2 is fixed by the clamping mechanism 7. At the same time, the clamping mechanism 7 drives the secondary winding connection mechanism 5 to contact the output end of the through-core current transformer 2 through the linkage mechanism 8; the second screw 71 is rotated, and the second screw 71 drives the second slider 73 to move, and the second slider 73 drives the transverse block 74 and the clamping block 75 to move. Under the action of the guide wedge block 76, the transverse block 74 drives the clamping block 75 to approach the middle position of the second slider 73, and then the two clamping blocks 75 clamp the through-core current transformer 2. When the second slider 73 moves, the second slider 73 drives the intermediate gear 83 to rotate through the first rack 81, and the intermediate gear 83 drives the second rack 82 The first slider 53 moves in the opposite direction to the first slider 53, and the first slider 53 drives the mounting block 51 and the elastic spiral telescopic rod 57 to move through the telescopic block 52 and the first compression spring 55, so that the two elastic spiral telescopic rods 57 are respectively inserted into the S1 end hole and the S2 end hole; when the model of the through-core current transformer 2 is changed, the positions of the S1 end hole and the S2 end hole may be changed. At this time, the horizontal distance between the two elastic spiral telescopic rods 57 can be adjusted by rotating the double-headed screw 513, and the height of the elastic spiral telescopic rod 57 can be adjusted by rotating the first screw 59, so that the secondary winding connection mechanism 5 can adapt to the output end of the through-core current transformer 2 of different models, and the device has a wider range of applications; S03: Check whether there is an open circuit between the input end of the secondary winding connection mechanism 5 and the output end of the through-core current transformer 2. If there is an open circuit, continue to adjust the position of the input end of the secondary winding connection mechanism 5 until they are connected; turn on the switch 514 and observe whether the warning light 515 is on. If the warning light 515 is on, it means that the input end of the secondary winding connection mechanism 5 and the output end of the through-core current transformer 2 are in good contact. If the warning light 515 is not on, it means that there is an open circuit between the input end of the secondary winding connection mechanism 5 and the output end of the through-core current transformer 2. Adjust the position of the elastic spiral telescopic rod 57 until the warning light 515 is on; S04: Pass the middle of the primary winding assembly 3 through the through-core current transformer 2; pull up the left terminal 39 and the right terminal 31 with two hands respectively, so that both the left terminal 39 and the right terminal 31 pass through the through-core current transformer 2, and connect the ends of the left terminal 39 and the right terminal 31; S05: The current I1 input to the primary winding assembly 3 is controlled through the control panel 6, and the current I2 flowing out of the S1 terminal hole on the through-core current transformer 2 is measured using the control panel 6. The multiplier of the through-core current transformer 2 is I1 / I2. The current of the primary winding assembly 3 can be continuously changed, so that multiple groups of experiments can be performed to make the experimental results more accurate.

[0041] Embodiment 2 In some cases, for example, the current transformer has been put into use, but after long-term use, it is found that its multiplier is wrong, resulting in inaccurate measurement data of the current on its secondary winding side, which in turn affects the use of the distribution cabinet. At this time, this product can also be used to calibrate the multiplier of the current transformer that has been put into use.

[0042] Specifically, on the basis of the structure of the first embodiment, an insulating rod (not shown) is further added, and the insulating rod is fixedly connected to the bottom of the calibration platform 1. When the current transformer to be tested is at a higher position, the insulating rod can be used to send the device to a higher place; During the inspection, firstly, the power distribution cabinet is powered off, and one person takes a ladder to the current transformer and removes the current transformer. In order to facilitate the subsequent reinstallation or avoid errors during reinstallation, the busbar can be left intact, and only the base of the current transformer and the wires on its secondary winding side can be removed. Then another person holds an insulating rod to send the device up, and the staff at the top can connect the wires according to the steps in the above embodiment 1 and conduct the inspection. After completion, the current transformer can be directly reinstalled back to its original position.

[0043] Since the space for workers at heights to move around is relatively small, in order to facilitate the operation of the device and prevent workers at heights from accidentally coming into contact with electric current, in this embodiment, the control panel 6 can be removed from the calibration platform 1 and made movable, with only one wire remaining to connect it to the various parts on the calibration platform 1. The control panel 6 is operated by the workers below, so that the workers at heights can stay as far away from the calibration platform as possible, thereby protecting the personal safety of the workers at heights.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0045] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A universal current transformer ratio calibration device, comprising a calibration station (1), characterized in that: The calibration platform (1) is provided with a placement slot (4), the placement slot (4) being used to place the through-core current transformer (2), the calibration platform (1) is provided with a control panel (6), and further comprises: A primary winding assembly (3), the primary winding assembly (3) being mounted on a calibration platform (1), the middle portion of the primary winding assembly (3) being detachably passed through a through-core current transformer (2), the two ends of the primary winding assembly (3) being electrically connected to the positive and negative poles of an external power supply device, respectively, the control panel (6) being connected in series in the circuit of the primary winding assembly (3), and when the primary winding assembly (3) is energized, the primary winding assembly (3) is used to provide an electromagnetic field for the through-core current transformer (2); A clamping mechanism (7), the clamping mechanism (7) being mounted on the calibration platform (1), the clamping mechanism (7) being used to fix the through-core current transformer (2) in the placement slot (4); A secondary winding connection mechanism (5), the secondary winding connection mechanism (5) being mounted on a calibration platform (1), the two input ends of the secondary winding connection mechanism (5) being respectively connectable to the two secondary winding output ends of a through-core current transformer (2), the output end of the secondary winding connection mechanism (5) being electrically connected to a control panel (6), the secondary winding connection mechanism (5) being used to electrically connect the through-core current transformer (2) and the control panel (6).

2. The universal current transformer ratio calibration device according to claim 1, characterized in that: The primary winding assembly (3) comprises two mounting seats (32), the two mounting seats (32) being fixedly mounted on the calibration platform (1) on both sides of the through-core current transformer (2), the two mounting seats (32) being rotatably connected to a take-up drum (34), the two take-up drums (34) being wound with a winding wire (35), both ends of the calibration platform (1) being fixedly connected to a column (36), the top ends of the two columns (36) being rotatably connected to a guide pulley (37), one end of one winding wire (35) passing around the guide pulley (37) being connected to a left wiring terminal (39), and one end of the other winding wire (35) passing around the guide pulley (37) being connected to a right wiring terminal (31), the left wiring terminal (39) and the right wiring terminal (31) being able to pass through the middle of the through-core current transformer (2) and being electrically connected; An elastic winding box (33) is fixedly connected to the mounting seat (32), a torsion spring is arranged inside the elastic winding box (33), an output end of the torsion spring is connected to one end of a take-up reel (34), and initially, all of the winding wires (35) are wound around the take-up reel (34).

3. The universal current transformer ratio calibration device according to claim 2, characterized in that: An electrode cylinder (311) is embedded at the end of the left wiring terminal (39), and the electrode cylinder (311) is electrically connected to one end of a winding wire (35); an electrode column (312) is provided at the end of the right wiring terminal (31), and the electrode column (312) is electrically connected to one end of another winding wire (35); the electrode column (312) can be inserted into the electrode cylinder (311) and is electrically connected to the electrode cylinder (311); A clamping slot (310) is provided at the end of the left wiring terminal (39), and a clamping block (313) is fixedly connected to the end of the right wiring terminal (31), and the clamping block (313) can be clamped with the clamping slot (310).

4. The universal current transformer ratio calibration device according to claim 2, characterized in that: The primary winding assembly (3) further comprises two support cylinders (38), the two support cylinders (38) being respectively fixedly connected to opposite sides of the two uprights (36), and the ends of the left connecting terminal (39) and the right connecting terminal (31) can be respectively inserted into the two support cylinders (38); The support tube (38) is provided with a bell mouth at the end close to the through-core current transformer (2).

5. The universal current transformer ratio calibration device according to claim 1, characterized in that: The clamping mechanism (7) comprises a second mounting cavity (72) provided inside the calibration platform (1), the second mounting cavity (72) being connected to the placement slot (4), a second slider (73) being slidably connected inside the second mounting cavity (72), both ends of the side surface of the second slider (73) close to the placement slot (4) being slidably connected to a transverse block (74), a third compression spring (78) being connected between the transverse block (74) and the second slider (73), one end of the transverse block (74) extending into the placement slot (4), a clamping block (75) being slidably connected to the opposite sides of the two transverse blocks (74), and a second compression spring (77) being connected between the clamping block (75) and the transverse block (74); A second screw rod (71) is rotatably connected inside the second mounting cavity (72), the second screw rod (71) is threadedly connected to a second sliding block (73), and one end of the second screw rod (71) extends out of the calibration platform (1); The clamping mechanism (7) further comprises two guide wedge blocks (76), and the two guide wedge blocks (76) are respectively arranged on two side walls of the placement groove (4).

6. The universal current transformer ratio calibration device according to claim 5, characterized in that: The secondary winding connection mechanism (5) comprises a first installation cavity (54) provided inside the calibration platform (1); a first slider (53) is slidably connected inside the first installation cavity (54); a telescopic block (52) is fixedly connected to the side of the first slider (53) close to the placement groove (4); one end of the telescopic block (52) is slidably connected to a mounting block (51); a first compression spring (55) is connected between the mounting block (51) and the telescopic block (52); one end of the mounting block (51) extending into the placement groove (4) is fixedly connected to a fixing frame (512); a lifting frame (510) is vertically slidably connected to the fixing frame (512); a first screw rod (59) is rotatably connected to the top of the lifting frame (510); the first screw rod (59) is threadedly connected to the fixing frame (512); Two adjustment blocks (511) are connected to the frame (510) in a horizontal sliding manner inside. A double-headed screw (513) is rotatably connected to the lifting frame (510). The two ends of the double-headed screw (513) are respectively threadedly connected to the two adjustment blocks (511). One end of the double-headed screw (513) extends out of a fixing frame (512). The fixing frame (512) is provided with a slit for the double-headed screw (513) to move. The sides of the two adjustment blocks (511) close to the through-core current transformer (2) are fixedly connected to fixing columns (56). One ends of the two fixing columns (56) are fixedly connected to elastic spiral telescopic rods (57). The ends of the elastic spiral telescopic rods (57) are fixedly connected to abutment joints (58). The two elastic spiral telescopic rods (57) are electrically connected to the control panel (6) through wires. The elastic spiral telescopic rod (57) is formed by winding an elastic metal in a spiral shape, the elastic spiral telescopic rod (57) is tapered as a whole, and the abutment head (58) is made of a metal material; The secondary winding connection mechanism (5) further comprises a linkage mechanism (8), wherein the linkage mechanism (8) is installed in the first installation cavity (54), one end of the linkage mechanism (8) is connected to the first slider (53), and the other end of the linkage mechanism (8) passes through the calibration platform (1) and is connected to the second slider (73). When the second slider (73) moves, the linkage mechanism (8) is used to drive the first slider (53) to move in the opposite direction.

7. The universal current transformer ratio calibration device according to claim 6, characterized in that: The linkage mechanism (8) comprises an intermediate gear (83) rotatably connected to the inside of the first mounting cavity (54); a first rack (81) is fixedly connected to the side surface of the second slider (73); one end of the first rack (81) extending into the first mounting cavity (54) is meshed with the intermediate gear (83); one end of the first slider (53) is fixedly connected to the second rack (82); the second rack (82) is meshed with the intermediate gear (83); and the first rack (81) and the second rack (82) are respectively located on both sides of the intermediate gear (83).

8. The universal current transformer ratio calibration device according to claim 6, characterized in that: The secondary winding connection mechanism (5) further comprises a warning light (515), a switch (514) and an independent battery. The warning light (515), the switch (514) and the independent battery are all mounted on the lifting frame (510). The two ends of the switch (514) are respectively electrically connected to the two elastic spiral telescopic rods (57), so that the secondary winding on the through-core current transformer (2), the two elastic spiral telescopic rods (57), the warning light (515), the independent battery and the switch (514) form a complete loop.

9. A method for using the universal current transformer ratio calibration device as claimed in claim 8, characterized in that: The steps include: S01: placing the core-through type current transformer (2) into the placement slot (4); S02: The through-core current transformer (2) is fixed by a clamping mechanism (7), and at the same time, the clamping mechanism (7) drives the secondary winding connection mechanism (5) to contact the output end of the through-core current transformer (2) through a linkage mechanism (8); S03: Check whether there is an open circuit between the input end of the secondary winding connection mechanism (5) and the output end of the through-core current transformer (2); if there is an open circuit, continue to adjust the position of the input end of the secondary winding connection mechanism (5) until they are connected; S04: Passing the middle portion of the primary winding assembly (3) through the core-through current transformer (2); S05: The current I1 input to the primary winding assembly (3) is controlled by the control panel (6), and the current I2 flowing out of the secondary winding output end of the through-core current transformer (2) is measured by the control panel (6). The multiplier of the through-core current transformer (2) is I1 / I2.

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