A current transformer for measuring high-voltage standard current and a measurement method thereof

Abstract

The invention relates to a current transformer for measuring high-voltage standard current and a measurement method thereof, belonging to the technical field of transformers. The invention comprises a shell and two concave frames fixedly mounted inside the shell, a plurality of tightly contacted silicon steel sheets are connected inside the two concave frames, two windings are wound around both sides of the silicon steel sheets, and both windings are connected to the shell, two screws are connected through one side of the concave frame, and the screws are connected through one side of the silicon steel sheets, a nut is threadedly connected to the surface of the screw, the nut contacts the concave frame, an angle encoder is fixedly mounted on one side of the nut, two tightening members are fixedly mounted on one side of the concave frame, and both tightening members are transmission-connected to the two nuts. The invention can prevent the expansion of gaps between the silicon steel sheets, resulting in increased core loss and increased heat generation, thereby affecting the voltage conversion accuracy, and the nuts can be tightened without disassembling the shell, thereby preventing frequent disassembly from causing a decrease in the sealing performance of the shell and affecting the reliability of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of mutual inductors, and in particular to a current mutual inductor for measuring high-voltage standard current and a measurement method thereof. Background Art

[0002] With the rapid development of smart grids and ultra-high voltage transmission networks, accurate measurement of high-voltage standard current has become critical for stable power system operation, metering, billing, and fault diagnosis. Current transformers, the core equipment for high-voltage current measurement, have a direct impact on the accuracy and reliability of power parameter monitoring. With the expansion of renewable energy grid integration and the increasing complexity of power load characteristics, traditional current transformers and their measurement methods are increasingly unable to meet the high-precision requirements of modern power systems.

[0003] The current transformers and measurement methods currently used for high-voltage standard current measurement lack an integrated design and can only measure a single current parameter. They are unable to synchronously obtain related electrical variables such as voltage and temperature, making it difficult to meet the requirements of multi-parameter collaborative analysis of power systems. In addition, the iron core in the current transformer is connected by multiple silicon steel sheets through bolts and nuts. When the power system is running, the current transformer vibrates continuously due to the action of electromagnetic alternating forces, causing the threaded connection between the bolts and nuts to loosen. This looseness can cause gaps between the silicon steel sheets. The gaps between the silicon steel sheets increase the magnetic resistance, resulting in increased core loss and heat generation, and even affecting the voltage conversion accuracy. Secondly, it is inconvenient to tighten the nuts, and the transformer needs to be manually disassembled to tighten the nuts. Frequent disassembly may lead to a decrease in the sealing performance of the transformer and even cause insulation failure, affecting the reliability of the equipment.

[0004] In view of the above problems, a current transformer for high-voltage standard current measurement and a measurement method thereof are proposed. Summary of the Invention

[0005] The object of the present invention is to provide a current transformer for high-voltage standard current measurement and a measurement method thereof. By adopting this device, the problem that it is difficult to meet the requirements of multi-parameter collaborative analysis of the power system in the above background, gaps are generated between silicon steel sheets under continuous vibration, and it is inconvenient to tighten the loose nuts, and the transformer needs to be manually disassembled to tighten the nuts. Frequent disassembly may lead to a decrease in the sealing performance of the transformer.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The high-voltage standard current measurement method is characterized by comprising the following steps:

[0008] S1: Module connection: Connect current and voltage sensors to the transformer body, install a temperature sensor on the core, complete the acquisition module deployment, connect the acquisition module with the processing module, connect the power supply module and the communication module, and complete the system construction;

[0009] S2: Parameter setting and calibration: Set the transformer's main body transformation ratio, range and other parameters through external equipment, and use the built-in standard resistor of the processing module to calibrate the signal acquisition and calculation functions;

[0010] S3: Signal acquisition and conversion: The acquisition module obtains the current, voltage and temperature signals of the transformer body and transmits them to the processing module. The processing module filters, amplifies and performs analog-to-digital conversion to convert the analog signals into digital signals.

[0011] S4: Data processing and calculation: The microcontroller in the processing module operates on the digital signal, calculates the effective value of current and voltage, power, harmonics and other electrical variables, and corrects the results based on temperature data;

[0012] S5: Data storage and transmission: Store the calculated electrical variable data into the memory and send the data to the external terminal.

[0013] The present invention also provides another technical solution: a current transformer for measuring high-voltage standard current, comprising a transformer body, an acquisition module, a processing module, a communication module, a power supply module, and an external terminal, wherein the acquisition module, the processing module, the communication module, and the power supply module are all arranged inside the transformer body, the acquisition module is connected to the transformer body, the power supply module is electrically connected to the acquisition module, the processing module, and the communication module, and the communication module is electrically connected to the external terminal;

[0014] The transformer body includes a shell and two concave frames fixedly installed inside the shell, and a number of tightly contacted silicon steel sheets are connected to the inside of the two concave frames. Two windings are wound around both sides of the silicon steel sheet, and the two windings are connected to the shell. Two screws are connected through one side of the concave frame, and the screws are connected through one side of the silicon steel sheet. A nut is threadedly connected to the surface of the screw, and the nut is in contact with the concave frame. An angle encoder is fixedly installed on one side of the nut, and two tightening parts are fixedly installed on one side of the concave frame. The two tightening parts are both transmission connected to the two nuts. A clamping part is fixedly installed inside the shell, and two pushing frames are fixedly installed on both sides of the clamping part. Two fastening parts are fixedly installed on one side of the concave frame near one end of the screw, and the two fastening parts are in contact with the pushing frame.

[0015] Furthermore, four limit shells are fixedly installed inside the shell, limit rods are fixedly installed on both sides of the limit shells, first springs are fixedly installed on both sides of the limit shells, a movable seat is slidably connected inside the limit shell, the movable seat is slidably connected to the limit rods, and one end of the first spring is fixedly connected to the movable seat, a horizontal plate is fixedly installed on one side of the movable seat, and a first insulating plate is fixedly installed on one side of the horizontal plate.

[0016] Furthermore, the movable seat includes a wedge plate and two first wedge blocks fixed on one side of the wedge plate, the first wedge blocks are slidably connected to the limit shell and the limit rod, one end of the first spring is fixedly connected to the first wedge block, a through hole is opened on one side of the first wedge block, and the limit rod is slidably connected to the through hole.

[0017] Furthermore, a bottom plate is fixedly mounted on one side of the concave frame, a first vertical plate is fixedly mounted on one side of the bottom plate, and a second vertical plate is fixedly mounted on one side of the bottom plate.

[0018] Furthermore, a cambered groove is provided on the side of one end of the screw.

[0019] Furthermore, a first bevel gear is fixedly installed on the surface of the nut, and the tightening part includes a rotating rod and a rotating plate fixed at one end of the rotating rod. The rotating rod is rotatably connected to the first vertical plate, a contact rod is fixedly installed on one side of the rotating plate, and a second bevel gear is fixedly installed at one end of the rotating rod, and the second bevel gear is meshed and linked with the first bevel gear.

[0020] Furthermore, the clamping member includes a concave plate and an electromagnetic valve fixed on both sides of the concave plate, a sliding rod is fixedly installed on one side of the concave plate, two cross plates are slidably connected inside the concave plate, and one end of the cross plate is slidably connected to the sliding rod, a magnet block is fixedly installed on one side of the cross plate, the magnet block is in contact with the electromagnetic valve, clamping plates are fixedly installed on both sides of the cross plate, a second insulating plate is fixedly installed on one side of the clamping plate, a first L-shaped rod is fixedly installed on both sides of the cross plate and one side of the clamping plate, the first L-shaped rod is slidably connected to the limit shell, one end of the first L-shaped rod is rotatably connected to a roller, and the roller is in contact with the wedge plate.

[0021] Furthermore, the pushing frame includes a second L-shaped rod and a third L-shaped rod fixed to one end of the second L-shaped rod, a contact plate is fixedly installed on one end of the third L-shaped rod, the contact plate contacts the contact rod, and a groove is opened on one side of the third L-shaped rod.

[0022] Furthermore, the tightening member includes an insertion rod and a circular plate fixed at one end of the insertion rod, the insertion rod is slidably connected to the second vertical plate and the arc groove, a second spring is fixedly installed on one side of the circular plate, one end of the second spring is fixedly connected to the second vertical plate, a second wedge block is fixedly installed on one side of the circular plate, and the second wedge block is in contact with the groove.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The acquisition module synchronously collects current, voltage and temperature signals to achieve multi-parameter collaborative measurement; the processing module uses temperature data to correct the results, greatly improving measurement accuracy. The highly integrated modular architecture reduces external connections and reduces the risk of electromagnetic interference. At the same time, the processing module performs in-depth calculations on the data, and the communication module supports real-time data transmission, facilitating remote monitoring and fault prediction. It can synchronously obtain related electrical variables such as voltage and temperature to meet the requirements of multi-parameter collaborative analysis of the power system.

[0025] The angle encoder monitors the change in the rotation angle of the nut and converts the mechanical displacement into an electrical signal and transmits it to the controller. The controller can control the clamping parts to clamp and fix the silicon steel sheets. The clamping force makes the multiple silicon steel sheets in close contact, which can prevent the gaps between the silicon steel sheets from expanding, resulting in increased core loss and increased heat generation, thereby affecting the voltage conversion accuracy. During the movement of the pushing frame, the fastening part can be inserted into one end of the screw. By inserting the fastening part into one end of the screw, the screw can be returned to its original position, and the fastening part can limit the screw to prevent the screw and nut from rotating in the same direction. At the same time, the pushing frame will push the tightening part back to its original position, so the tightening part can drive the nut back to its original position, which can achieve the effect of rotation and tightening. This process can be completed without manual intervention and can achieve an intelligent effect. Therefore, there is no need to disassemble the shell to tighten the nut, which prevents frequent disassembly from causing the shell sealing performance to deteriorate and affecting the reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a measurement flow chart of the present invention;

[0027] Figure 2 It is a measurement system diagram of the present invention;

[0028] Figure 3 Schematic diagram of the overall structure of the mutual inductor body of the present invention;

[0029] Figure 4 Schematic diagram of the housing structure of the present invention;

[0030] Figure 5 This is a schematic diagram of the nut structure of the present invention;

[0031] Figure 6 Schematic diagram of the limiting shell structure of the present invention;

[0032] Figure 7 It is a structural schematic diagram of the mobile seat of the present invention;

[0033] Figure 8 It is a schematic diagram of the concave frame structure of the present invention;

[0034] Figure 9 For the present invention Figure 5 Schematic diagram of the structure at A in the middle;

[0035] Figure 10 For the present invention Figure 8 Schematic diagram of the structure at B in the middle;

[0036] Figure 11 It is a schematic diagram of the structure of the clamping member of the present invention;

[0037] Figure 12 It is a schematic diagram of the structure of the push frame of the present invention;

[0038] Figure 13 It is a schematic diagram of the silicon steel sheet clamping and resetting structure of the present invention.

[0039] In the figure: 1. power supply module; 2. housing; 21. limit housing; 22. limit rod; 23. first spring; 24. movable seat; 241. wedge plate; 242. first wedge block; 243. through hole; 25. horizontal plate; 26. first insulating plate; 3. concave frame; 31. bottom plate; 32. first vertical plate; 33. second vertical plate; 4. silicon steel sheet; 5. winding; 6. screw; 61. arc groove; 7. nut; 71. first bevel gear; 8. angle encoder; 9. tightening member; 91. rotating rod; 92. rotating plate; 93. contact rod; 94. second bevel gear; 10. clamping member ;101, concave plate;102, solenoid valve;103, sliding rod;104, cross plate;105, magnet block;106, clamping plate;107, second insulating plate;108, first L-shaped rod;109, roller;20, acquisition module;30, processing module;40, communication module;50, external terminal;60, transformer body;70, pushing frame;701, second L-shaped rod;702, third L-shaped rod;703, contact plate;704, groove;80, fastening member;801, insertion rod;802, circular plate;803, second spring;804, second wedge block. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] In order to solve the technical problems that it is difficult to meet the requirements of the multi-parameter collaborative analysis of the power system and it is inconvenient to tighten the nut 7, it is necessary to manually disassemble the housing 2 to tighten the nut 7, such as Figure 1-Figure 4 、 Figure 7-Figure 9 and Figure 11-12 As shown, the following preferred technical solutions are provided:

[0042] The high-voltage standard current measurement method is characterized by comprising the following steps:

[0043] Step 1: Module connection: Connect current and voltage sensors to the current transformer, install a temperature sensor on the core, complete the deployment of the acquisition module 20, connect the acquisition module 20 to the processing module 30, connect the power supply module 1 and the communication module 40, and complete the system construction;

[0044] Step 2: Parameter setting and calibration: Set the current transformer ratio, range and other parameters through external equipment, and use the built-in standard resistor of the processing module 30 to calibrate the signal acquisition and calculation functions;

[0045] Step 3: Signal acquisition and conversion: The acquisition module 20 acquires the current transformer current, voltage and temperature signals and transmits them to the processing module 30. The processing module 30 filters, amplifies and performs analog-to-digital conversion to convert the analog signals into digital signals.

[0046] Step 4: Data processing and calculation: The microcontroller in the processing module 30 operates on the digital signal, calculates the effective value of current and voltage, power, harmonics and other electrical variables, and corrects the results based on the temperature data;

[0047] Step 5: Data storage and transmission: The calculated electrical variable data is stored in the memory and the data is sent to the external terminal 50.

[0048] The acquisition module 20 synchronously collects current, voltage and temperature signals to realize multi-parameter collaborative measurement. The processing module 30 uses temperature data to correct the results, greatly improving the measurement accuracy. The highly integrated modular architecture reduces external connections and reduces the risk of electromagnetic interference. At the same time, the processing module 30 performs in-depth calculations on the data, and the communication module 40 supports real-time data transmission, which facilitates remote monitoring and fault prediction. It can synchronously obtain related electrical variables such as voltage and temperature to meet the requirements of multi-parameter collaborative analysis of the power system.

[0049] The present invention also proposes another embodiment: a current transformer for measuring high-voltage standard current, including a transformer body 60, an acquisition module 20, a processing module 30, a communication module 40, a power supply module 1 and an external terminal 50, the acquisition module 20, the processing module 30, the communication module 40 and the power supply module 1 are all arranged inside the transformer body 60, the acquisition module 20 is connected to the transformer body 60, the power supply module 1 is electrically connected to the acquisition module 20, the processing module 30 and the communication module 40, and the communication module 40 is electrically connected to the external terminal 50.

[0050] The transformer body 60 includes a housing 2 and two concave frames 3 fixedly installed inside the housing 2. Several tightly contacted silicon steel sheets 4 are connected to the inside of the two concave frames 3. The iron core is formed by several tightly contacted silicon steel sheets 4. Two windings 5 ​​are wound on both sides of the silicon steel sheet 4, and the two windings 5 ​​are connected to the housing 2. One of the two windings 5 ​​is a primary winding 5 for accessing a high-voltage circuit, and the other is a secondary winding 5 for outputting a low-voltage signal. Two screws 6 are connected through one side of the concave frame 3, and the screw 6 is connected through one side of the silicon steel sheet 4. A nut 7 is threadedly connected to the surface of the screw 6. The nut 7 is in contact with the concave frame 3. An angle encoder 8 is fixedly installed on one side of the nut 7. The angle encoder 8 can monitor in real time The rotation angle of the nut 7 changes, and the mechanical displacement is converted into an electrical signal and transmitted to the controller (the controller is a prior art and is not shown in the figure). Two tightening parts 9 are fixedly installed on one side of the concave frame 3. The two tightening parts 9 are both transmission connected to the two nuts 7. A clamping part 10 is fixedly installed inside the shell 2. The clamping part 10 can clamp and fix the silicon steel sheet 4. Two pushing frames 70 are fixedly installed on both sides of the clamping part 10. Two fastening parts 80 are fixedly installed on one side of the concave frame 3 near one end of the screw 6. The two fastening parts 80 are in contact with the pushing frame 70. The concave frame 3, screw 6, nut 7, angle encoder 8, tightening part 9, clamping part 10, pushing frame 70 and fastening part 80 are all made of insulating materials.

[0051] When vibration is generated for a long time and causes the threaded connection between the screw 6 and the nut 7 to become loose, due to the gap between the concave frame 3 and the silicon steel sheet 4, gaps are gradually generated between the multiple silicon steel sheets 4 due to the force of vibration. At this time, the nut 7 will rotate in the direction of loosening and drive the tightening part 9 to rotate. At this time, the angle encoder 8 monitors the change in the rotation angle of the nut 7 and converts the mechanical displacement into an electrical signal and transmits it to the controller. The controller can control the clamping part 10 to clamp and fix the silicon steel sheet 4. The clamping force makes the multiple silicon steel sheets 4 close contact, which can prevent the gaps between the silicon steel sheets 4 from expanding, resulting in increased core loss and increased heat generation, thereby affecting the voltage conversion accuracy.

[0052] At the same time, the clamping part 10 will cause the pushing frame 70 to move during the clamping of the silicon steel sheet 4. During the movement of the pushing frame 70, the tightening part 80 can be inserted into one end of the screw 6. By inserting the tightening part 80 into one end of the screw 6, the screw 6 can return to its original position, and the tightening part 80 can limit the screw 6 to prevent the screw 6 and the nut 7 from rotating in the same direction. At the same time, the pushing frame 70 will push the tightening part 9 back to its original position, so the tightening part 9 can drive the nut 7 back to its original position, which can achieve the effect of rotation and tightening. This process can be completed without manual intervention and can achieve an intelligent effect. Therefore, the nut 7 can be tightened without disassembling the shell 2, which can prevent frequent disassembly from causing the sealing performance of the shell 2 to decline and affecting the reliability of the equipment.

[0053] A bottom plate 31 is fixedly mounted on one side of the concave frame 3, a first vertical plate 32 is fixedly mounted on one side of the bottom plate 31, and a second vertical plate 33 is fixedly mounted on one side of the bottom plate 31. Both the first vertical plate 32 and the second vertical plate 33 can support the tightening member 9 and the tightening member 80. An arc groove 61 is opened on the side of one end of the screw 6. First, when the screw 6 and the nut 7 are loose, the rotation angle of the screw 6 will not be large or will not rotate at all, and the opening of the arc groove 61 can better reset the screw 6.

[0054] A first bevel gear 71 is fixedly mounted on the surface of the nut 7, and the tightening member 9 includes a rotating rod 91 and a rotating plate 92 fixed to one end of the rotating rod 91. The rotating rod 91 is rotatably connected to the first vertical plate 32, and a contact rod 93 is fixedly mounted on one side of the rotating plate 92. A second bevel gear 94 is fixedly mounted on one end of the rotating rod 91, and the second bevel gear 94 is meshed with the first bevel gear 71. When the nut 7 and the screw 6 are loose, the nut 7 will rotate in the loosening direction and can drive the first bevel gear 71 to rotate at the same time. The rotation of the first bevel gear 71 can drive the second bevel gear 94 to rotate, thereby driving the rotating plate 92 and the contact rod 93 to tilt toward one end of the push frame 70.

[0055] The pushing frame 70 includes a second L-shaped rod 701 and a third L-shaped rod 702 fixed at one end of the second L-shaped rod 701. A contact plate 703 is fixedly installed at one end of the third L-shaped rod 702. The contact plate 703 contacts the contact rod 93. A groove 704 is provided on one side of the third L-shaped rod 702. The contact rod 93 contacts the contact rod 93 to push the contact rod 93 back to its original position.

[0056] The tightening member 80 includes an insert rod 801 and a circular plate 802 fixed to one end of the insert rod 801. The insert rod 801 is slidably connected to the second vertical plate 33 and the arc groove 61. A second spring 803 is fixedly installed on one side of the circular plate 802. One end of the second spring 803 is fixedly connected to the second vertical plate 33. A second wedge block 804 is fixedly installed on one side of the circular plate 802. The second wedge block 804 is in contact with the groove 704.

[0057] When the third L-shaped rod 702 moves, the groove 704 squeezes the second wedge block 804, so that the second wedge block 804 disengages from the groove 704 and contacts the surface of the third L-shaped rod 702. At this time, the insertion rod 801 is inserted into the arc groove 61. One end of the insertion rod 801 is an arc end. On the one hand, it can position the screw rod 6 to prevent the screw rod 6 from rotating in the same direction as the nut 7. On the other hand, it can make the screw 6 return to its initial position. When the third L-shaped rod 702 returns to its initial position, the elastic force of the second spring 803 makes the second wedge block 804 slide into the groove 704, so that the insertion rod 801 is separated from the arc groove 61.

[0058] In order to solve the technical problem that the gaps between the silicon steel sheets 4 are caused by the continuous vibration caused by the electromagnetic alternating force, the gaps between the silicon steel sheets 4 increase the magnetic resistance, resulting in increased loss and increased heat, such as Figure 10-12 As shown, the following preferred technical solutions are provided:

[0059] The clamping member 10 includes a concave plate 101 and electromagnetic valves 102 fixed on both sides of the concave plate 101. A slide bar 103 is fixedly installed on one side of the concave plate 101. Two cross plates 104 are slidably connected inside the concave plate 101, and one end of the cross plate 104 is slidably connected to the slide bar 103. The movement of the cross plate 104 can be limited by the slide bar 103. A magnet block 105 is fixedly installed on one side of the cross plate 104. The magnet block 105 contacts the electromagnetic valve 102. When the valve 102 is energized, it can repel and attract the magnet block 105. Clamping plates 106 are fixedly installed on both sides of the cross plate 104, and a second insulating plate 107 is fixedly installed on one side of the clamping plate 106. First L-shaped rods 108 are fixedly installed on both sides of the cross plate 104 and one side of the clamping plate 106. The first L-shaped rod 108 is slidingly connected to the limit shell 21, and one end of the first L-shaped rod 108 is rotatably connected to a roller 109, and the roller 109 is in contact with the wedge plate 241.

[0060] When the two solenoid valves 102 are energized, a repulsive force can be formed on the two magnet blocks 105. At this time, the two cross plates 104 move relative to each other, and the wedge plate 241 can be pushed by the four first L-shaped rods 108 and the rollers 109. Due to the limitation of the inclined surface of the wedge plate 241, the wedge plate 241 will move downward, which will drive the cross plate 25 and the first insulating plate 26 to move downward. The first insulating plate 26 contacts several silicon steel sheets 4 and applies a pushing force. At this time, the first insulating plate 26 on the top of the silicon steel sheet 4 will push the silicon steel sheet 4 downward, so that the silicon steel sheet 4 can be kept in a stable state. Maintained in the same horizontal plane, the first insulating plates 26 on both sides of the silicon steel sheet 4 will push the dislocated silicon steel sheet 4 back to the initial position and align it, and can push the silicon steel sheet 4 back to the initial position and arrange it neatly. The silicon steel sheet 4 can be clamped and fixed by the clamping plate 106 and the second insulating plate 107. At the same time, the four pushing frames 70 will be driven to move, and the four contact rods 93 will be pushed by the pushing frames 70. If one of the nuts 7 rotates, the force pushed by the pushing frames 70 can make the contact rod 93 and the rotating plate 92 return to their initial positions, so that the nut 7 is tightened.

[0061] In order to solve the technical problem that the silicon steel sheet 4 will produce relative displacement due to the existence of gaps under the action of electromagnetic forces such as magnetostrictive effect caused by alternating magnetic fields and vibration impact force, and gradually deviate from the original stacking position, such as Figure 5-Figure 6 、 Figure 10 and Figure 12 As shown, the following preferred technical solutions are provided:

[0062] Four limit shells 21 are fixedly installed inside the shell 2. A strip-shaped opening is opened at the bottom of one end of the limit shell 21. When the shell 2 is disassembled, the two limit shells 21 at the upper end of the shell 2 can be driven out to prevent obstruction. Two limit shells 21 are distributed on the upper end of the silicon steel sheet 4, and a limit shell 21 is distributed on both sides of the silicon steel sheet 4. Limit rods 22 are fixedly installed on both sides of the limit shell 21. First springs 23 are fixedly installed on both sides of the limit shell 21. A moving seat 24 is slidably connected inside the limit shell 21. The moving seat 24 is slidably connected to the limit rod 22, and one end of the first spring 23 is fixedly connected to the moving seat 24. The first spring 23 can provide elastic force to the moving seat 24. A horizontal plate 25 is fixedly installed on one side of the moving seat 24, and a first insulating plate 26 is fixedly installed on one side of the horizontal plate 25.

[0063] When the screw 6 and the nut 7 become loose due to vibration, resulting in a gap between the silicon steel sheets 4, the silicon steel sheets 4 are likely to be displaced. When the screw 6 passes through the group of silicon steel sheets 4 and is tightened by the nut 7, a pre-tightening force will be generated on the silicon steel sheets 4, making the laminated sheets fit tightly together to form a whole. When the vibration causes the screw 6 and the nut 7 to loosen, the pre-tightening force drops significantly or even disappears, and the group of silicon steel sheets 4 loses its rigid constraint. At this time, the silicon steel sheets 4 will produce relative displacement due to the existence of the gap under the action of electromagnetic forces such as the magnetostrictive effect caused by the alternating magnetic field and the vibration impact force, and gradually deviate from the original stacking position. Therefore, when the clamping member 10 moves, it will push the moving seat 24 to move inside the limit shell 21. At this time, the moving seat 24 will drive the cross plate 25 and the first insulating plate 26 to move downward, and the first insulating plate 26 contacts several silicon steel sheets 4 and applies a pushing force. At this time, the first insulating plate 26 on the top of the silicon steel sheet 4 will push the silicon steel sheet 4 downward, so that the silicon steel sheet 4 can remain in the same horizontal plane. Secondly, the first insulating plates 26 on both sides of the silicon steel sheet 4 will push the dislocated silicon steel sheet 4 back to the initial position and align them, which can push the silicon steel sheet 4 back to the initial position and arrange them neatly.

[0064] The movable seat 24 includes a wedge plate 241 and two first wedge blocks 242 fixed on one side of the wedge plate 241. The first wedge blocks 242 are slidably connected to the limit shell 21 and the limit rod 22. One end of the first spring 23 is fixedly connected to the first wedge block 242. A through hole 243 is formed on one side of the first wedge block 242. The limit rod 22 is slidably connected to the through hole 243. The movement of the wedge plate 241 can be limited by the movement of the first wedge block 242 on the limit rod 22. When the wedge plate 241 loses the continuous pushing force, the wedge plate 241 can be pushed back to its original position by the force of the first spring 23.

[0065] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0066] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A current transformer for high-voltage standard current measurement, characterized in that: The invention comprises a transformer body (60), a collection module (20), a processing module (30), a communication module (40), a power supply module (1) and an external terminal (50), wherein the collection module (20), the processing module (30), the communication module (40) and the power supply module (1) are all arranged inside the transformer body (60), the collection module (20) is connected to the transformer body (60), the power supply module (1) is electrically connected to the collection module (20), the processing module (30) and the communication module (40), and the communication module (40) is electrically connected to the external terminal (50); The transformer body (60) comprises a housing (2) and two concave frames (3) fixedly mounted inside the housing (2), a plurality of closely contacted silicon steel sheets (4) are connected inside the two concave frames (3), two windings (5) are wound around both sides of the silicon steel sheets (4), and both windings (5) are connected to the housing (2), one side of the concave frame (3) is connected through two screws (6), and the screws (6) are connected through one side of the silicon steel sheets (4), and a nut (7) is threadedly connected on the surface of the screws (6), and the nut (7) is connected to the The concave frame (3) is in contact with the nut (7), an angle encoder (8) is fixedly installed on one side of the nut (7), two screwing members (9) are fixedly installed on one side of the concave frame (3), and the two screwing members (9) are both transmission-connected with the two nuts (7), a clamping member (10) is fixedly installed inside the housing (2), and two push frames (70) are fixedly installed on both sides of the clamping member (10), and two abutting members (80) are fixedly installed on one side of the concave frame (3) near one end of the screw (6), and the two abutting members (80) are in contact with the push frame (70); Four limiting shells (21) are fixedly installed inside the shell (2), limiting rods (22) are fixedly installed on both sides of the limiting shell (21), first springs (23) are fixedly installed on both sides of the limiting shell (21), a moving seat (24) is slidably connected inside the limiting shell (21), the moving seat (24) is slidably connected to the limiting rod (22), and one end of the first spring (23) is fixedly connected to the moving seat (24), a horizontal plate (25) is fixedly installed on one side of the moving seat (24), and a first insulating plate (26) is fixedly installed on one side of the horizontal plate (25); The movable seat (24) includes a wedge plate (241) and two first wedge blocks (242) fixed on one side of the wedge plate (241), the first wedge blocks (242) are slidably connected to the limiting shell (21) and the limiting rod (22), one end of the first spring (23) is fixedly connected to the first wedge block (242), a through hole (243) is opened on one side of the first wedge block (242), and the limiting rod (22) is slidably connected to the through hole (243).

2. The current transformer for high-voltage standard current measurement according to claim 1, characterized in that: A bottom plate (31) is fixedly mounted on one side of the concave frame (3), a first vertical plate (32) is fixedly mounted on one side of the bottom plate (31), and a second vertical plate (33) is fixedly mounted on one side of the bottom plate (31).

3. The current transformer for high-voltage standard current measurement according to claim 2, characterized in that: An arcuate groove (61) is provided on the side of one end of the screw (6).

4. The current transformer for high-voltage standard current measurement according to claim 3, characterized in that: A first bevel gear (71) is fixedly mounted on the surface of the nut (7). The tightening member (9) includes a rotating rod (91) and a rotating plate (92) fixed to one end of the rotating rod (91). The rotating rod (91) is rotatably connected to the first vertical plate (32). A contact rod (93) is fixedly mounted on one side of the rotating plate (92). A second bevel gear (94) is fixedly mounted on one end of the rotating rod (91). The second bevel gear (94) is meshed and linked with the first bevel gear (71).

5. The current transformer for high-voltage standard current measurement according to claim 4, characterized in that: The clamping member (10) includes a concave plate (101) and electromagnetic valves (102) fixed on both sides of the concave plate (101), a slide rod (103) is fixedly installed on one side of the concave plate (101), two cross plates (104) are slidably connected inside the concave plate (101), and one end of the cross plate (104) is slidably connected to the slide rod (103), and a magnet block (105) is fixedly installed on one side of the cross plate (104), and the magnet block (105) is in contact with the electromagnetic valve (102). The cross plate (104) is fixedly mounted with clamping plates (106) on both sides, and a second insulating plate (107) is fixedly mounted on one side of the clamping plate (106). A first L-shaped rod (108) is fixedly mounted on both sides of the cross plate (104) and one side of the clamping plate (106). The first L-shaped rod (108) is slidably connected to the limit shell (21). One end of the first L-shaped rod (108) is rotatably connected to a roller (109), and the roller (109) is in contact with the wedge plate (241).

6. The current transformer for high-voltage standard current measurement according to claim 5, characterized in that: The pushing frame (70) comprises a second L-shaped rod (701) and a third L-shaped rod (702) fixed to one end of the second L-shaped rod (701); a contact plate (703) is fixedly mounted on one end of the third L-shaped rod (702); the contact plate (703) is in contact with the contact rod (93); and a groove (704) is provided on one side of the third L-shaped rod (702).

7. The current transformer for high-voltage standard current measurement according to claim 6, characterized in that: The holding member (80) includes an insertion rod (801) and a circular plate (802) fixed to one end of the insertion rod (801), the insertion rod (801) is slidably connected to the second vertical plate (33) and the arc groove (61), a second spring (803) is fixedly installed on one side of the circular plate (802), one end of the second spring (803) is fixedly connected to the second vertical plate (33), and a second wedge block (804) is fixedly installed on one side of the circular plate (802), and the second wedge block (804) is in contact with the groove (704).

8. A high-voltage standard current measurement method applied to a current transformer as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Module connection: connect the current and voltage sensors in the current transformer, install the temperature sensor at the core, complete the deployment of the acquisition module (20), connect the acquisition module (20) with the processing module (30), connect the power supply module (1) and the communication module (40), and complete the system construction; S2: Parameter setting and calibration: Setting the current transformer ratio and range parameters through external equipment, and calibrating the signal acquisition and calculation functions using the built-in standard resistor of the processing module (30); S3: Signal acquisition and conversion: the acquisition module (20) acquires the current transformer current, voltage and temperature signals, transmits them to the processing module (30), and the processing module (30) filters, amplifies and performs analog-to-digital conversion to convert the analog signals into digital signals; S4: Data processing and calculation: The microcontroller in the processing module (30) operates on the digital signal, calculates the effective value of current and voltage, power, harmonic electrical variables, and corrects the results in combination with temperature data; S5: Data storage and transmission: The calculated electrical variable data is stored in the memory and the data is sent to the external terminal (50).

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