Current transformer for high-voltage standard current measurement and measurement method thereof

Abstract

The invention discloses a current transformer for high-voltage standard current measurement and a measurement method thereof, and belongs to the technical field of mutual inductors, the current transformer comprises a shell and two concave frames fixedly installed in the shell, the two concave frames are internally connected with a plurality of silicon steel sheets in close contact, two sides of each silicon steel sheet are wound with two windings, and the two windings are connected with the shell. Two screws are connected to one side of the concave frame in a penetrating mode, the screws are connected to one side of the silicon steel sheet in a penetrating mode, nuts are connected to the surfaces of the screws in a threaded mode and make contact with the concave frame, angle encoders are fixedly installed on one sides of the nuts, two screwing pieces are fixedly installed on one side of the concave frame, and the two screwing pieces are both in transmission connection with the two nuts. According to the invention, the situation that the voltage conversion precision is influenced by iron core loss increase and heating aggravation caused by gap expansion between the silicon steel sheets can be prevented, the nut can be screwed without dismounting the shell, and the situation that the sealing performance of the shell is reduced and the equipment reliability is influenced due to frequent dismounting is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of instrument transformers, and specifically to a current transformer for high-voltage standard current measurement and its measurement method. Background Technique

[0002] In the context of the rapid development of smart grids and UHV transmission networks, the accurate measurement of high-voltage standard current has become a key link in the stable operation, metering and billing, and fault diagnosis of power systems. As the core device for realizing high-voltage current measurement, the performance of current transformers directly affects the accuracy and reliability of power parameter monitoring. With the expansion of the scale of new energy grid connection and the increasing complexity of power load characteristics, traditional current transformers and their measurement methods are gradually difficult to meet the high-precision requirements of modern power systems.

[0003] For current transformers for high-voltage standard current measurement and their measurement methods at present, conventional current transformers lack an integrated design and can only measure current parameters singly. They are unable to synchronously obtain associated electrical variables such as voltage and temperature, and it is difficult to meet the requirements of multi-parameter collaborative analysis in power systems. Moreover, the iron core in the current transformer is composed of multiple silicon steel sheets together, which are connected by bolts and nuts. When the power system is operating, the current transformer generates continuous vibration due to electromagnetic alternating force, causing the threaded connection through the bolts and nuts to become loose. This loosening will cause gaps between the silicon steel sheets, increasing the magnetic resistance of the silicon steel sheets, resulting in increased iron core loss and heat generation, and even affecting the voltage transformation accuracy. Secondly, it is not convenient to tighten the nuts, and it is necessary to manually disassemble the transformer to tighten the nuts. Frequent disassembly may lead to a decline in the sealing performance of the transformer and even cause insulation faults, affecting the reliability of the equipment.

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

[0005] The purpose of the present invention is to provide a current transformer for high-voltage standard current measurement and its measurement method. By using this device for operation, the problems in the above background that it is difficult to meet the requirements of multi-parameter collaborative analysis in power systems, gaps are generated between silicon steel sheets under continuous vibration, it is not convenient to tighten loose nuts, and it is necessary to manually disassemble the transformer to tighten the nuts, and frequent disassembly may lead to a decline in the sealing performance of the transformer are solved.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: A high-voltage standard current measurement method, characterized by including the following steps: S1: Module connection: Connect current and voltage sensors inside the transformer body, install a temperature sensor at the iron core, complete the deployment of the acquisition module, connect the acquisition module and the processing module, and connect the power supply module and the communication module to complete the system construction; S2: Parameter setting and calibration: Set parameters such as the transformation ratio and range of the main body of the current transformer through an external device, and use the built-in standard resistor of the processing module to calibrate the signal acquisition and calculation functions; S3: Signal acquisition and conversion: The acquisition module obtains the current, voltage, and temperature signals of the main body of the current transformer, transmits them to the processing module, and after filtering, amplification, and analog-to-digital conversion by the processing module, converts the analog signal into a digital signal; S4: Data processing and calculation: The microcontroller in the processing module operates on the digital signal, calculates electrical variables such as the effective values of current and voltage, power, and harmonics, and corrects the results in combination with temperature data; S5: Data storage and transmission: Store the calculated electrical variable data in the memory and send the data to an external terminal.

[0007] The present invention also provides another technical solution: a current transformer for high-voltage standard current measurement, including a main body of the current transformer, an acquisition module, a processing module, a communication module, a power supply module, and an external terminal. The acquisition module, the processing module, the communication module, and the power supply module are all arranged inside the main body of the current transformer. The acquisition module is connected to the main body of the current transformer. The power supply module is electrically connected to the acquisition module, the processing module, and the communication module respectively. The communication module is electrically connected to the external terminal; The main body of the current transformer includes a housing and two concave frames fixedly installed inside the housing. A number of closely contacted silicon steel sheets are connected inside both concave frames. Two windings are wound on both sides of the silicon steel sheets, and both windings are connected to the housing. Two screw rods penetrate and are connected to one side of the silicon steel sheets on one side of the concave frame, and nuts are threadedly connected to the surfaces of the screw rods. The nuts are in contact with the concave frames. An angle encoder is fixedly installed on one side of the nut. Two tightening members are fixedly installed on one side of the concave frame, and both tightening members are in transmission connection with the two nuts. A clamping member is fixedly installed inside the housing. Two pushing frames are fixedly installed on both sides of the clamping member. Two abutting members are fixedly installed at one end of the screw rod on one side of the concave frame, and both abutting members are in contact with the pushing frames.

[0008] Further, four limiting shells are fixedly installed inside the housing. Limiting rods are fixedly installed on both sides of the limiting shells. First springs are fixedly installed on both sides of the limiting shells. A moving seat is slidably connected inside the limiting shells. The moving seat is slidably connected to the limiting rods, and one end of the first spring is fixedly connected to the moving seat. A cross plate is fixedly installed on one side of the moving seat. A first insulating plate is fixedly installed on one side of the cross plate.

[0009] Further, the moving seat includes a wedge-shaped plate and two first wedge-shaped blocks fixed on one side of the wedge-shaped plate. The first wedge-shaped blocks are slidably connected to the limiting shells and the limiting rods respectively. One end of the first spring is fixedly connected to the first wedge-shaped blocks. Through holes are formed through one side of the first wedge-shaped blocks, and the limiting rods are slidably connected to the through holes.

[0010] Further, a bottom plate is fixedly installed on one side of the concave frame, a first vertical plate is fixedly installed on one side of the bottom plate, and a second vertical plate is fixedly installed on one side of the bottom plate.

[0011] Further, an arc surface groove is formed on the side of one end of the screw rod.

[0012] Further, a first bevel gear is fixedly installed on the surface of the nut. The tightening member 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. A second bevel gear is fixedly installed at one end of the rotating rod. The second bevel gear is meshed and connected with the first bevel gear.

[0013] Further, the clamping member includes a concave plate and electromagnetic valves 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. First L-shaped rods are fixedly installed on both sides of the cross plate and one side of the clamping plate. The first L-shaped rods are slidably connected to the limiting shell. A roller is rotatably connected to one end of the first L-shaped rod. The roller is in contact with the wedge-shaped plate.

[0014] Further, the pushing frame includes a second L-shaped rod and a third L-shaped rod fixed at one end of the second L-shaped rod. A contact plate is fixedly installed at one end of the third L-shaped rod. The contact plate is in contact with the contact rod. A groove is formed on one side of the third L-shaped rod.

[0015] Further, the pressing member includes a plug rod and a round plate fixed at one end of the plug rod. The plug rods are slidably connected to both the second vertical plate and the arc surface groove. A second spring is fixedly installed on one side of the round plate. One end of the second spring is fixedly connected to the second vertical plate. A second wedge-shaped block is fixedly installed on one side of the round plate. The second wedge-shaped block is in contact with the groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The acquisition module synchronously acquires current, voltage and temperature signals to realize multi-parameter collaborative measurement; the processing module uses temperature data to correct the result, greatly improving the measurement accuracy. The highly integrated modular architecture reduces external wiring and the risk of electromagnetic interference. At the same time, the processing module deeply operates on the data, and the communication module supports real-time data transmission, facilitating remote monitoring and fault prediction. It can synchronously obtain associated electrical variables such as voltage and temperature, meeting the requirements of multi-parameter collaborative analysis of the power system.

[0017] The angle encoder monitors the change in the rotation angle of the nut, converts the mechanical displacement into an electrical signal and transmits it to the controller. Through the controller, the clamping member can be controlled to clamp and fix the silicon steel sheets. The force of clamping enables the multiple silicon steel sheets to be in close contact with each other, which can prevent the increase in core loss and heat generation caused by the expansion of the gaps between the silicon steel sheets, thus affecting the voltage conversion accuracy. During the movement of the pushing frame, the pressing member can be inserted into one end of the screw. By inserting the pressing member into one end of the screw, the screw can return to its initial position, and the pressing member can play a role in limiting the position of the screw to prevent the screw and the nut from rotating in the same direction. At the same time, the pushing frame will push the tightening member back to its initial position. Therefore, the tightening member can drive the nut back to its initial position, achieving the effect of rotational tightening. This process can be completed without manual intervention and can achieve an intelligent effect. Therefore, the nut can be tightened without disassembling the housing, preventing the sealing performance of the housing from decreasing due to frequent disassembly and affecting the reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the measurement flow chart of the present invention; Figure 2 is the measurement system diagram of the present invention; Figure 3 is the overall structural schematic diagram of the main body of the mutual inductor of the present invention; Figure 4 is the structural schematic diagram of the housing of the present invention; Figure 5 is the structural schematic diagram of the nut of the present invention; Figure 6 is the structural schematic diagram of the limiting housing of the present invention; Figure 7 is the structural schematic diagram of the moving seat of the present invention; Figure 8 is the structural schematic diagram of the concave-shaped frame of the present invention; Figure 9 of the present invention Figure 5 structural schematic diagram at position A; Figure 10 of the present invention Figure 8 structural schematic diagram at position B; Figure 11 is the structural schematic diagram of the clamping member of the present invention; Figure 12 is the structural schematic diagram of the pushing frame of the present invention; Figure 13 is the structural schematic diagram of the clamping and resetting of the silicon steel sheets of the present invention.

[0019] In the figure: 1. Power supply module; 2. Housing; 21. Limit housing; 22. Limit rod; 23. First spring; 24. Moving seat; 241. Wedge plate; 242. First wedge block; 243. Through hole; 25. Cross 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 surface 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. Slide 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. Main body of current transformer; 70. Pushing frame; 701. Second L-shaped rod; 702. Third L-shaped rod; 703. Contact plate; 704. Groove; 80. Tightening member; 801. Plug rod; 802. Round plate; 803. Second spring; 804. Second wedge block. Detailed implementation manners

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] In order to solve the technical problems that it is difficult to meet the requirements of multi-parameter collaborative analysis of the power system and it is inconvenient to tighten the nut 7, and manual disassembly of the housing 2 is required to tighten the nut 7, as Figures 1-4 、 Figures 7-9 and Figures 11-12 shown, the following preferred technical solutions are provided: A high-voltage standard current measurement method, characterized in that it includes the following steps: Step 1: Module connection: Connect current and voltage sensors in the current transformer, install a temperature sensor at the iron 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; Step 2: Parameter setting and calibration: Set parameters such as the transformation ratio and range of the current transformer through external devices, and use the built-in standard resistor of the processing module 30 to calibrate the signal acquisition and calculation functions; Step 3: Signal acquisition and conversion: The acquisition module 20 acquires the current, voltage, and temperature signals of the current transformer, transmits them to the processing module 30, and after filtering, amplifying, and analog-to-digital conversion by the processing module 30, converts the analog signals into digital signals; Step 4: Data processing and calculation: The microcontroller in the processing module 30 performs operations on the digital signals, calculates electrical variables such as the effective values of current and voltage, power, and harmonics, and corrects the results in combination with the temperature data; Step 5: Data storage and transmission: Store the calculated electrical variable data in the memory and send the data to the external terminal 50.

[0022] The acquisition module 20 synchronously acquires the current, voltage, and temperature signals to achieve multi-parameter collaborative measurement. The processing module 30 corrects the results using the temperature data, greatly improving the measurement accuracy. The highly integrated modular architecture reduces external wiring and the risk of electromagnetic interference. At the same time, the processing module 30 deeply operates on the data, and the communication module 40 supports real-time data transmission, facilitating remote monitoring and fault prediction. It can synchronously obtain associated electrical variables such as voltage and temperature, meeting the requirements of multi-parameter collaborative analysis in the power system.

[0023] The present invention also proposes another implementation manner: A current transformer for high-voltage standard current measurement, including a transformer main 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 main body 60. The acquisition module 20 is connected to the transformer main body 60. The power supply module 1 is electrically connected to the acquisition module 20, the processing module 30, and the communication module 40. The communication module 40 is electrically connected to the external terminal 50.

[0024] The main body 60 of the mutual inductor includes a housing 2 and two concave frames 3 fixedly installed inside the housing 2. A number of closely contacted silicon steel sheets 4 are connected inside both of the two concave frames 3. An iron core is formed by the number of closely contacted silicon steel sheets 4. Two windings 5 are wound on both sides of the silicon steel sheets 4, and both of the two windings 5 are connected to the housing 2. One of the two windings 5 is a primary winding 5 for connecting to a high-voltage circuit, and the other is a secondary winding 5 for outputting a low-voltage signal. Two screws 6 penetrate and connect to one side of the concave frame 3, and the screws 6 penetrate and connect to one side of the silicon steel sheets 4. A nut 7 is threadedly connected to the surface of the screw 6, and the nut 7 contacts the concave frame 3. An angle encoder 8 is fixedly installed on one side of the nut 7. The angle encoder 8 can monitor the change in the rotation angle of the nut 7 in real time and convert the mechanical displacement into an electrical signal and transmit it to a controller (the controller is a prior art and not shown in the figure). Two tightening members 9 are fixedly installed on one side of the concave frame 3, and both of the two tightening members 9 are in transmission connection with the two nuts 7. A clamping member 10 is fixedly installed inside the housing 2. The clamping member 10 can clamp and fix the silicon steel sheets 4. Two pushing frames 70 are fixedly installed on both sides of the clamping member 10. Two abutting members 80 are fixedly installed on one side of the concave frame 3 near one end of the screw 6, and both of the two abutting members 80 contact the pushing frames 70. The concave frame 3, the screw 6, the nut 7, the angle encoder 8, the tightening member 9, the clamping member 10, the pushing frame 70, and the abutting member 80 are all made of insulating materials.

[0025] When vibration occurs for a long time, resulting in the loosening of the threaded connection between the screw 6 and the nut 7, due to the gap between the concave frame 3 and the silicon steel sheets 4, gaps gradually appear between the multiple silicon steel sheets 4 due to the vibration force. At this time, the nut 7 will rotate in the loosening direction and drive the tightening member 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 member 10 to clamp and fix the silicon steel sheets 4. Through the clamping force, the multiple silicon steel sheets 4 are in close contact, which can prevent the increase in iron core loss and heat generation caused by the expansion of the gaps between the silicon steel sheets 4, thereby affecting the voltage transformation accuracy.

[0026] At the same time, during the process of the clamping member 10 clamping the silicon steel sheets 4, the pushing frame 70 will be moved. During the movement of the pushing frame 70, the abutting member 80 can be inserted into one end of the screw 6. By inserting the abutting member 80 into one end of the screw 6, the screw 6 can return to its initial position, and the abutting member 80 can limit the position of 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 member 9 back to its initial position. Therefore, the tightening member 9 can drive the nut 7 back to its initial position, achieving the effect of rotation and tightening. This process can be completed without manual intervention and can achieve an intelligent effect. Therefore, it is not necessary to disassemble the housing 2 to tighten the nut 7, preventing the sealing performance of the housing 2 from decreasing due to frequent disassembly and affecting the reliability of the equipment.

[0027] One side of the concave frame 3 is fixedly installed with a bottom plate 31. One side of the bottom plate 31 is fixedly installed with a first vertical plate 32, and one side of the bottom plate 31 is fixedly installed with a second vertical plate 33. Both the first vertical plate 32 and the second vertical plate 33 can play a role in supporting the tightening member 9 and the pressing member 80. An arc-shaped groove 61 is opened on the side of one end of the screw rod 6. First, when the screw rod 6 and the nut 7 become loose, at this time, the rotation angle of the screw rod 6 is not very large or it does not rotate, and the opening of the arc-shaped groove 61 can better reset the screw rod 6.

[0028] A first bevel gear 71 is fixedly installed 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. One side of the rotating plate 92 is fixedly installed with a contact rod 93, and a second bevel gear 94 is fixedly installed at one end of the rotating rod 91. The second bevel gear 94 is meshed and linked with the first bevel gear 71. When the nut 7 and the screw rod 6 become loose, at this time, the nut 7 will rotate in the loosening direction, and at the same time, it can drive the first bevel gear 71 to rotate. 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 towards one end of the pushing frame 70.

[0029] The pushing frame 70 includes a second L-shaped rod 701 and a third L-shaped rod 702 fixed to one end of the second L-shaped rod 701. One end of the third L-shaped rod 702 is fixedly installed with a contact plate 703. The contact plate 703 is in contact with the contact rod 93. A groove 704 is opened on one side of the third L-shaped rod 702. By contacting the contact rod 93 with the contact rod 93, the contact rod 93 can be pushed back to the initial position.

[0030] The pressing member 80 includes a plug rod 801 and a round plate 802 fixed to one end of the plug rod 801. The plug rod 801 is slidably connected to both the second vertical plate 33 and the arc-shaped groove 61. One side of the round plate 802 is fixedly installed with a second spring 803. One end of the second spring 803 is fixedly connected to the second vertical plate 33. One side of the round plate 802 is fixedly installed with a second wedge-shaped block 804. The second wedge-shaped block 804 is in contact with the groove 704.

[0031] When the third L-shaped rod 702 moves, the second wedge-shaped block 804 is squeezed through the groove 704, so that the second wedge-shaped block 804 is separated from the groove 704 and contacts the surface of the third L-shaped rod 702. At this time, the plug rod 801 is inserted into the arc-shaped groove 61. One end of the plug rod 801 is an arc-shaped 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 rod 6 return to the initial position. When the third L-shaped rod 702 returns to the initial position, the second wedge-shaped block 804 slides into the groove 704 through the elastic force of the second spring 803, so that the plug rod 801 is separated from the arc-shaped groove 61.

[0032] To solve the technical problems that the continuous vibration caused by the action of electromagnetic alternating force results in gaps between the silicon steel sheets 4, the increase of the magnetic resistance due to the increase of the gaps between the silicon steel sheets 4, and the increase of losses and heat generation, as Figures 10-12 shown, the following preferred technical solutions are provided: The clamping member 10 includes a concave plate 101 and solenoid 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, and the magnet block 105 is in contact with the solenoid valve 102. When the solenoid 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 rods 108 are slidably connected to the limiting 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.

[0033] 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 relatively. The wedge plate 241 can be pushed through 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 at this time, driving the cross plate 25 and the first insulating plate 26 to move downward. The first insulating plate 26 is in contact with a plurality of 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 sheets 4 can be kept on the same horizontal plane. Secondly, the first insulating plates 26 on both sides of the silicon steel sheet 4 will push the misaligned silicon steel sheets 4 back to the initial position and align them, and can push the silicon steel sheets 4 back to the initial position and arrange them neatly. The silicon steel sheets 4 can be clamped and fixed by the clamping plates 106 and the second insulating plates 107. At the same time, the four pushing frames 70 will be driven to move. The four contact rods 93 are pushed through the pushing frames 70. If one of the nuts 7 rotates, the pushing force through the pushing frames 70 can make the contact rods 93 and the rotating plate 92 return to the initial position, so that the nut 7 is tightened.

[0034] To solve the technical problems that under the action of the magnetostrictive effect and vibration impact force caused by electromagnetic force such as alternating magnetic field, the silicon steel sheets 4 will have relative displacement due to the existence of gaps and gradually deviate from the original stacked position, as Figures 5-6 、 Figure 10 and Figure 12 shown, the following preferred technical solutions are provided: Four limiting shells 21 are fixedly installed inside the housing 2. A strip-shaped opening is formed at the bottom of one end of the limiting shell 21. When the housing 2 is disassembled, the two limiting shells 21 at the upper end of the housing 2 can be driven out to prevent obstruction. Two limiting shells 21 are distributed at the upper end of the silicon steel sheet 4, and one limiting shell 21 is distributed on each side of the silicon steel sheet 4. Limiting rods 22 are fixedly installed on both sides of the limiting shell 21, and 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 with the limiting rods 22, and one end of the first spring 23 is fixedly connected with the moving seat 24. The first spring 23 can provide an elastic force to the moving seat 24. A cross 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 cross plate 25.

[0035] When the screw 6 and the nut 7 become loose due to vibration and a gap appears between the silicon steel sheets 4, the silicon steel sheets 4 are likely to shift in position. When the screw 6 passes through the group of silicon steel sheets 4 and is tightened by the nut 7, a pre-tightening force is generated on the silicon steel sheets 4, causing the laminated sheets to fit tightly together to form a whole. When vibration causes the screw 6 and the nut 7 to become loose, the pre-tightening force drops significantly or even disappears, and the group of silicon steel sheets 4 loses the rigid constraint. At this time, under the action of electromagnetic forces such as the magnetostrictive effect caused by an alternating magnetic field and vibration impact forces, the silicon steel sheets 4 will have relative displacement due to the existence of the gap and gradually deviate from the original laminated position. Therefore, when the clamping member 10 moves, it will push the moving seat 24 to move inside the limiting 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 with several silicon steel sheets 4 and applies a pushing force. At this time, the first insulating plate 26 at the top of the silicon steel sheet 4 will push the silicon steel sheet 4 downward, so that the silicon steel sheets 4 can be kept on the same horizontal plane. Secondly, the first insulating plates 26 on both sides of the silicon steel sheet 4 will push the misaligned silicon steel sheets 4 back to the initial position and align them, and can push the silicon steel sheets 4 back to the initial position and arrange them neatly.

[0036] The moving seat 24 includes a wedge-shaped plate 241 and two first wedge-shaped blocks 242 fixed on one side of the wedge-shaped plate 241. The first wedge-shaped blocks 242 are slidably connected with the limiting shell 21 and the limiting rods 22. One end of the first spring 23 is fixedly connected with the first wedge-shaped block 242. A through hole 243 is formed through one side of the first wedge-shaped block 242, and the limiting rod 22 is slidably connected with the through hole 243. The movement of the wedge-shaped plate 241 can be limited by the movement of the first wedge-shaped block 242 on the limiting rod 22. When the continuous pushing force on the wedge-shaped plate 241 is lost, the force of the first spring 23 can push the wedge-shaped plate 241 back to the initial position.

[0037] It should be noted that in this text, relational terms such as first and second are only used 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 term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0038] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-voltage standard current measurement method, characterized in that: It includes the following steps: S1: Module connection: Connect current and voltage sensors inside the current transformer, install a temperature sensor at the iron 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 setup; S2: Parameter setting and calibration: Set parameters such as the transformation ratio and range of the current transformer through an external device, and use the built-in standard resistor in the processing module (30) to calibrate the signal acquisition and calculation functions; S3: Signal acquisition and conversion: The acquisition module (20) obtains the current, voltage, and temperature signals of the current transformer, transmits them to the processing module (30), and after filtering, amplification, and analog-to-digital conversion by the processing module (30), converts the analog signal into a digital signal; S4: Data processing and calculation: The microcontroller in the processing module (30) performs operations on the digital signal, calculates electrical variables such as the effective values of current and voltage, power, and harmonics, and corrects the results in combination with temperature data; S5: Data storage and transmission: Store the calculated electrical variable data in the memory and send the data to the external terminal (50).

2. A current transformer applicable to the high-voltage standard current measurement method according to claim 1, characterized in that: It includes a transformer main 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 main body (60). The acquisition module (20) is connected to the transformer main body (60). The power supply module (1) is electrically connected to the acquisition module (20), the processing module (30), and the communication module (40). The communication module (40) is electrically connected to the external terminal (50); The transformer main body (60) includes a housing (2) and two concave frames (3) fixedly installed inside the housing (2). A number of closely contacted silicon steel sheets (4) are connected inside both of the two concave frames (3). Two windings (5) are wound on both sides of the silicon steel sheet (4), and both of the two windings (5) are connected to the housing (2). Two screw rods (6) penetrate and connect to one side of the concave frame (3), and the screw rods (6) penetrate and connect to one side of the silicon steel sheet (4). A nut (7) is threadedly connected to the surface of the screw rod (6), and 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). Two tightening members (9) are fixedly installed on one side of the concave frame (3), and both of the two tightening members (9) are in transmission connection with the two nuts (7). A clamping member (10) is fixedly installed inside the housing (2). Two pushing frames (70) are fixedly installed on both sides of the clamping member (10). Two abutting members (80) are fixedly installed on one side of the concave frame (3) near one end of the screw rod (6), and both of the two abutting members (80) are in contact with the pushing frame (70).

3. The current transformer according to claim 2, characterized in that: Four limiting shells (21) are fixedly installed inside the housing (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 with the limiting rod (22). One end of the first spring (23) is fixedly connected with the moving seat (24). A cross plate (25) is fixedly installed on one side of the moving seat (24). A first insulating plate (26) is fixedly installed on one side of the cross plate (25).

4. The current transformer according to claim 3, characterized in that: The moving 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 both slidably connected with the limiting shell (21) and the limiting rod (22). One end of the first spring (23) is fixedly connected with the first wedge block (242). A through hole (243) is formed through one side of the first wedge block (242). The limiting rod (22) is slidably connected with the through hole (243).

5. The current transformer according to claim 4, characterized in that: A bottom plate (31) is fixedly installed on one side of the concave frame (3). A first vertical plate (32) is fixedly installed on one side of the bottom plate (31). A second vertical plate (33) is fixedly installed on one side of the bottom plate (31).

6. The current transformer according to claim 5, characterized in that: An arc surface groove (61) is formed on the side of one end of the screw rod (6).

7. The current transformer according to claim 6, characterized in that: A first bevel gear (71) is fixedly installed on the surface of the nut (7). The tightening member (9) includes a rotating rod (91) and a rotating plate (92) fixed at one end of the rotating rod (91). The rotating rod (91) is rotatably connected with the first vertical plate (32). A contact rod (93) is fixedly installed on one side of the rotating plate (92). A second bevel gear (94) is fixedly installed at one end of the rotating rod (91). The second bevel gear (94) is meshed and linked with the first bevel gear (71).

8. The current transformer according to claim 7, wherein: The clamping member (10) includes a concave plate (101) and electromagnetic valves (102) fixed on both sides of the concave plate (101). A sliding 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). One end of the cross plate (104) is slidably connected with the sliding rod (103). A magnet block (105) is fixedly installed on one side of the cross plate (104). The magnet block (105) is in contact with the electromagnetic valve (102). Clamping plates (106) are fixedly installed on both sides of the cross plate (104). 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 slidably connected with the limiting shell (21). A roller (109) is rotatably connected to one end of the first L-shaped rod (108). The roller (109) is in contact with the wedge plate (241).

9. The current transformer according to claim 8, wherein: 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) is in contact with the contact rod (93). A groove (704) is formed on one side of the third L-shaped rod (702).

10. The current transformer according to claim 9, characterized in that: The pressing 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 both the second vertical plate (33) and the arc-shaped groove (61). A second spring (803) is fixedly installed on one side of the circular plate (802), and one end of the second spring (803) is fixedly connected to the second vertical plate (33). A second wedge-shaped block (804) is fixedly installed on one side of the circular plate (802), and the second wedge-shaped block (804) is in contact with the groove (704).

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