A mutual inductor with anti-electromagnetic interference function

Abstract

The application relates to the technical field of mutual inductors, in particular to a mutual inductor with an anti-electromagnetic interference function, which comprises a first bottom plate and a second bottom plate, the second bottom plate is fixedly connected to the upper end of the first bottom plate, and a current-voltage mutual inductor shell is fixedly installed on the second bottom plate; a primary wire package, a secondary wire package and an iron core are fixedly installed in the current-voltage mutual inductor shell through epoxy resin; a heat dissipation fan is fixedly installed at the upper end of the first bottom plate, an air inlet pipe is communicated with the air outlet end of the heat dissipation fan, the air outlet end of the air inlet pipe is respectively communicated with a first heat dissipation pipe and a second heat dissipation pipe, and the first heat dissipation pipe and the second heat dissipation pipe extend into the current-voltage mutual inductor shell; upper vertical pipes are communicated with the two side walls in the current-voltage mutual inductor shell, and lower inclined pipes are fixedly communicated with the bottom ends of the two upper vertical pipes. The application is adapted to the current-voltage mutual inductor manufacturing process, uniform heat dissipation is realized through automatic air regulation, and the operation stability of the mutual inductor is ensured.

Description

Technical Field

[0001] This invention relates to the field of current transformer technology, specifically to a current transformer with electromagnetic interference suppression function. Background Technology

[0002] Current and voltage transformers are devices used in power systems to measure current, voltage, or electrical energy. They are essentially combinations of voltage and current transformers, used to measure single-phase power. During operation, current and voltage transformers are susceptible to interference from external electromagnetic radiation and internal electromagnetic coupling, affecting signal transmission quality. In existing technologies, to achieve insulation protection and structural stability, current and voltage transformers are typically manufactured by filling the casing with epoxy resin. The aim is to leverage the insulating properties and thermal conductivity of epoxy resin to balance equipment protection and heat dissipation requirements, ensuring the transformer's basic operation under complex conditions.

[0003] However, the existing technology for manufacturing current and voltage transformers that relies solely on epoxy resin infusion has the following heat dissipation drawbacks: the thermal conductivity of epoxy resin is relatively fixed and limited. When a current and voltage transformer is working, the core components such as the iron core and windings will form a non-uniform temperature field due to differences in electromagnetic losses. The heating intensity varies significantly in different areas. Relying solely on epoxy resin for synchronous heat dissipation cannot create directional and efficient heat dissipation channels for areas with concentrated high temperatures. This leads to heat accumulation in the core heating parts, making it difficult to achieve uniform heat dissipation. Furthermore, local overheating can accelerate component aging, reduce the measurement accuracy and operational stability of the current and voltage transformer, and in severe cases, even affect the service life of the equipment. At the same time, the local temperature difference caused by uneven heat dissipation may also accelerate the aging of epoxy resin, further weakening its insulation protection and electromagnetic interference resistance effects, failing to meet the practical application requirements of high-precision and high-reliability current and voltage transformers. Summary of the Invention

[0004] The purpose of this invention is to provide a current transformer with anti-electromagnetic interference function to solve the problem of uneven heat dissipation inside the current transformer mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a current transformer with anti-electromagnetic interference function, comprising a first base plate and a second base plate, the second base plate being fixedly connected to the upper end of the first base plate, and a current-voltage transformer housing being fixedly mounted on the second base plate; a primary coil, a secondary coil, and an iron core are fixedly mounted inside the current-voltage transformer housing via epoxy resin; a cooling fan is fixedly mounted on the upper end of the first base plate, the air outlet of the cooling fan being connected to an air inlet pipe, and the air outlet of the air inlet pipe being respectively connected to a first heat dissipation pipe and a second heat dissipation pipe, the first heat dissipation pipe and the second heat dissipation pipe extending into the current-voltage transformer housing; the current-voltage transformer housing is further provided with the following technical solution: A current transformer housing with anti-electromagnetic interference function, comprising a first base plate and a second base plate, the second base plate being fixedly connected to the upper end of the first base plate, and a current-voltage transformer housing being fixedly mounted on the second base plate; the current-voltage transformer housing is further provided with the following technical solution: a current-voltage transformer housing with anti-electromagnetic interference function, comprising a primary base plate and a secondary ... Both sides of the internal wall of the current transformer housing are connected to upper vertical pipes. The bottom ends of the two upper vertical pipes are fixedly connected to lower inclined pipes. The bottom end of one of the lower inclined pipes is connected to a first bottom pipe, and the bottom end of the other lower inclined pipe is connected to a second bottom pipe. A connecting rod is slidably connected inside the first bottom pipe and the second bottom pipe. A receiving plate is fixedly connected to the bottom end of the connecting rod inside the second bottom pipe. A distance measuring sensor is fixedly connected to the upper end of the first bottom plate. An adjusting plate is provided inside the air inlet pipe. The adjusting plate is in a transmission engagement with the connecting rod inside the first bottom pipe. An exhaust pipe is fixedly connected to the second bottom plate. The air outlets of the first heat dissipation pipe and the second heat dissipation pipe are both connected to the exhaust pipe.

[0006] Furthermore, both sides of the current and voltage transformer housing are provided with openings, and a first inclined block and a second inclined block are provided in the openings. The first inclined block is fixedly connected to the upper wall of the opening, and the second inclined block is fixedly connected to the lower wall of the opening.

[0007] Furthermore, the first inclined block is disposed at one end of the opening facing the outside of the current and voltage transformer housing, the second inclined block is disposed at one end of the opening facing the inside of the current and voltage transformer housing, and the upper end of the upper tube is connected to the opening.

[0008] Furthermore, a first retaining ring is fixedly connected to the upper end of the pipe wall of the upper riser, a first blocking block is slidably connected to the upper end of the pipe wall of the upper riser, two second retaining rings arranged one above the other are fixedly connected to the middle and lower end of the pipe wall of the upper riser, and a second blocking block is slidably connected to the middle and lower end of the pipe wall of the upper riser, with the second blocking block located between the two second retaining rings.

[0009] Furthermore, a third retaining ring is fixedly connected to the upper end of the first bottom tube and the second bottom tube, and a sliding plate is slidably connected to the inner wall of the first bottom tube and the second bottom tube located below the third retaining ring. The upper end of the connecting rod is fixedly connected to the bottom end of the sliding plate.

[0010] Furthermore, a fourth retaining ring is fixedly connected inside the lower end of the second bottom tube, and a connecting rod located inside the second bottom tube passes through the fourth retaining ring. A second spring is fixedly connected between the fourth retaining ring and the receiving plate. The second spring is sleeved on the connecting rod inside the second bottom tube, and the ranging sensor is located directly below the receiving plate.

[0011] Furthermore, an isolation box is fixedly connected to the upper end of the first base plate, and a rotating plate is rotatably connected to the inner wall of the isolation box. The bottom end of the connecting rod located inside the first base tube abuts against the upper surface of the rotating plate, and a first spring is fixedly connected between the bottom surface of the rotating plate and the bottom wall of the isolation box.

[0012] Furthermore, a partition is fixedly connected to the inner wall of the air inlet pipe, which divides the air inlet pipe into an upper pipe and a lower pipe. The air outlet end of the upper pipe is connected to a first connecting pipe, and the air outlet end of the lower pipe is connected to a second connecting pipe. The first connecting pipe is connected to the bottom end of the first heat dissipation pipe, and the second connecting pipe is connected to the bottom end of the second heat dissipation pipe.

[0013] Furthermore, the adjustment plate is rotatably connected to the end of the partition near the cooling fan via a rotating shaft. A rotating rod is fixed to the side end of the adjustment plate. The end of the rotating rod outside the air inlet pipe extends into the isolation box, and the rotating rod extending into the isolation box is fixedly connected to the middle of the rotating plate.

[0014] Furthermore, the first heat dissipation pipe extending into the housing of the current and voltage transformer is located at the upper end of the housing, and the second heat dissipation pipe extending into the housing of the current and voltage transformer is located at the lower end of the housing.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This current transformer with anti-electromagnetic interference function automatically adjusts the air volume by sensing the temperature difference between the upper and lower vertical pipes and driving the regulating plate, so as to achieve uniform heat dissipation inside the current transformer and avoid local overheating and aging.

[0016] This current transformer with anti-electromagnetic interference function achieves the effects of eliminating floating potential, blocking electromagnetic interference, and improving signal transmission accuracy through grounding of the first and second copper heat dissipation pipes, shell shielding, and dual oil cavity induction calibration. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the housing of the present invention. Figure 1 ; Figure 3 For the present invention Figure 2 Enlarged structural diagram of part A in the middle; Figure 4 For the present invention Figure 2 Enlarged structural diagram of section B; Figure 5 This is a schematic diagram of the structure of the first base plate of the present invention; Figure 6 This is a schematic diagram of the internal structure of the air inlet duct of the present invention. Figure 1 ; Figure 7 For the present invention Figure 6 A magnified structural diagram of part C in the middle; Figure 8 For the present invention Figure 6 A partially enlarged structural diagram of section D; Figure 9 This is a schematic diagram of the internal structure of the housing of the present invention. Figure 2 ; Figure 10 This is a schematic diagram of the internal structure of the air inlet duct of the present invention. Figure 2 .

[0018] In the attached diagram, the components represented by each number are as follows: 1. First base plate; 2. Second base plate; 3. Current and voltage transformer housing; 4. Cooling fan; 5. First heat sink; 6. Second heat sink; 7. Exhaust pipe; 8. First connecting pipe; 9. Second connecting pipe; 10. Primary coil; 11. Secondary coil; 12. Iron core; 13. Distance sensor; 14. First bottom tube; 15. Second bottom tube; 16. Air inlet pipe; 17. Partition plate; 18. Adjusting plate; 19. Rotating shaft 20. Rotating rod; 21. Rotating plate; 22. First spring; 23. First inclined block; 24. Second inclined block; 25. Upper vertical pipe; 26. First retaining ring; 27. First blocking block; 28. Second retaining ring; 29. ​​Second blocking block; 30. Lower inclined pipe; 31. Third retaining ring; 32. Sliding plate; 33. Connecting rod; 34. Second spring; 35. Receiving plate; 36. Fourth retaining ring; 37. Isolation box; 38. Opening. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention provides a technical solution: such as Figures 1-10The transformer shown includes a first base plate 1 and a second base plate 2. The second base plate 2 is fixedly connected to the upper end of the first base plate 1, and a current / voltage transformer housing 3 is fixedly installed on the second base plate 2. A primary coil 10, a secondary coil 11, and an iron core 12 are fixedly installed inside the current / voltage transformer housing 3 using epoxy resin. A cooling fan 4 is fixedly installed at the upper end of the first base plate 1. The air outlet of the cooling fan 4 is connected to an air inlet pipe 16, and the air outlet of the air inlet pipe 16 is connected to a first heat dissipation pipe 5 and a second heat dissipation pipe 6, respectively. The first heat dissipation pipe 5 and the second heat dissipation pipe 6 extend into the current / voltage transformer housing 3. Both sides of the interior of the current / voltage transformer housing 3 are connected to... There is an upper vertical pipe 25, and the bottom ends of the two upper vertical pipes 25 are fixedly connected to the lower inclined pipes 30. The bottom end of one of the lower inclined pipes 30 is connected to the first bottom pipe 14, and the bottom end of the other lower inclined pipe 30 is connected to the second bottom pipe 15. The first bottom pipe 14 and the second bottom pipe 15 are both slidably connected to the connecting rods 33. The bottom end of the connecting rods 33 in the second bottom pipe 15 is fixedly connected to the receiving plate 35. The upper end of the first base plate 1 is fixedly connected to the ranging sensor 13. The air inlet pipe 16 is provided with an adjusting plate 18, which is in a transmission cooperation with the connecting rods 33 in the first bottom pipe 14. The second base plate 2 is fixedly connected to the exhaust pipe 7, and the air outlets of the first heat dissipation pipe 5 and the second heat dissipation pipe 6 are both connected to the exhaust pipe 7.

[0021] In this invention, the first base plate 1 and the second base plate 2 are stacked and fixed together, serving as the supporting base for the entire transformer and providing a stable installation position for all components, preventing shaking or displacement when placed in the work area. The current and voltage transformer housing 3 is fixed to the upper end of the second base plate 2, providing a closed installation space for the primary coil 10, secondary coil 11, and iron core 12, while isolating external electromagnetic interference. The epoxy resin injected inside firmly fixes the primary coil 10, secondary coil 11, and iron core 12, improving the stability and insulation of the overall structure.

[0022] In this invention, the cooling fan 4 is fixed to the upper end of the first base plate 1, serving as the power source for the cooling airflow. During operation, it continuously supplies airflow into the air inlet pipe 16. The air inlet pipe 16 collects the airflow delivered by the cooling fan 4, providing a channel for airflow distribution. Both the first heat dissipation pipe 5 and the second heat dissipation pipe 6 are made of copper and extend into the current-voltage transformer housing 3. The first heat dissipation pipe 5 is located at the upper end of the current-voltage transformer housing 3, and the second heat dissipation pipe 6 is located at the lower end of the current-voltage transformer housing 3. The copper material can quickly absorb the heat inside the current-voltage transformer housing 3, and then carry the heat away through the internal airflow. At the same time, both the first heat dissipation pipe 5 and the second heat dissipation pipe 6 are connected to the current-voltage transformer housing 3 and grounded together, so no floating potential is generated during operation. Together with the housing, this achieves the effect of anti-electromagnetic interference.

[0023] In this invention, the first connecting pipe 8 connects the upper pipe of the air inlet pipe 16 to the first heat dissipation pipe 5, and the second connecting pipe 9 connects the lower pipe of the air inlet pipe 16 to the second heat dissipation pipe 6, providing closed channels for airflow delivery to prevent airflow leakage; the upper vertical pipe 25 is fixed to the two side walls inside the current and voltage transformer housing 3, and is filled with transformer oil to sense the temperature change at the upper end inside the current and voltage transformer housing 3; the lower inclined pipe 30 connects the upper vertical pipe 25 to the first bottom pipe 14 and the second bottom pipe 15, and is also filled with transformer oil to sense the temperature change at the lower end inside the current and voltage transformer housing 3. The upper vertical pipe 25 and the lower inclined pipe 30 cooperate with each other to form an upper and lower temperature sensing structure.

[0024] In this invention, the first bottom tube 14 and the second bottom tube 15 are vertically fixed to the upper end of the second base plate 2, providing space for the connecting rod 33 to slide smoothly up and down inside the first bottom tube 14 and the second bottom tube 15, transmitting the displacement force generated by temperature sensing; the receiving plate 35 is fixed to the bottom end of the connecting rod 33 inside the second bottom tube 15, and moves up and down synchronously with the connecting rod 33; the distance sensor 13 is fixed to the upper end of the first base plate 1 and faces the receiving plate 35, monitoring the moving distance of the receiving plate 35 in real time, and completing the calibration comparison of temperature adjustment.

[0025] In this invention, the regulating plate 18 is installed inside the air inlet pipe 16. By rotating it, the ventilation area of ​​the upper and lower pipes of the air inlet pipe 16 is changed, thereby adjusting the airflow rate entering the first heat dissipation pipe 5 and the second heat dissipation pipe 6. The rotating rod 20 connects the regulating plate 18 and the rotating plate 21, and transmits the rotation action of the rotating plate 21 to the regulating plate 18 to achieve mechanical transmission.

[0026] In this invention, the hot air that carries away heat eventually flows into the exhaust pipe 7 and is discharged outwards in a unified manner, thus preventing the hot air from accumulating inside the casing.

[0027] refer to Figures 1-10The current and voltage transformer housing 3 has openings 38 on both side walls. A first inclined block 23 and a second inclined block 24 are provided within each opening 38. The first inclined block 23 is fixedly connected to the upper wall of the opening 38, and the second inclined block 24 is fixedly connected to the lower wall of the opening 38. The first inclined block 23 is located at one end of the opening 38 facing outwards from the current and voltage transformer housing 3, and the second inclined block 24 is located at one end of the opening 38 facing inwards from the current and voltage transformer housing 3. The upper end of the upper vertical pipe 25 is connected to the opening 38. A first retaining ring 26 is fixedly connected to the upper wall of the upper vertical pipe 25, and a first blocking block 27 is slidably connected to the upper wall of the upper vertical pipe 25. Two second retaining rings 28, arranged one above the other, are fixedly connected inside the lower end of the pipe wall. A second blocking block 29 is slidably connected inside the lower end of the upper pipe wall, located between the two second retaining rings 28. A third retaining ring 31 is fixedly connected inside the upper end of both the first bottom pipe 14 and the second bottom pipe 15. A sliding plate 32 is slidably connected inside the pipe walls of both the first bottom pipe 14 and the second bottom pipe 15 below the third retaining ring 31. The upper end of the connecting rod 33 is fixedly connected to the bottom end of the sliding plate 32. A fourth retaining ring 36 is fixedly connected inside the lower end of the second bottom pipe 15. The connecting rod 33 inside the second bottom pipe 15 passes through the fourth retaining ring 36. The fourth retaining ring 36 connects to the connecting rod 36. A second spring 34 is fixedly connected between the receiving plates 35. The second spring 34 is sleeved on the connecting rod 33 inside the second bottom tube 15. The ranging sensor 13 is located directly below the receiving plate 35. An isolation box 37 is fixedly connected to the upper end of the first bottom plate 1. A rotating plate 21 is rotatably connected to the inner wall of the isolation box 37. The bottom end of the connecting rod 33 inside the first bottom tube 14 abuts against the upper surface of the rotating plate 21. A first spring 22 is fixedly connected between the bottom surface of the rotating plate 21 and the bottom wall of the isolation box 37. A partition 17 is fixedly connected to the inner wall of the air inlet pipe 16. The partition 17 divides the air inlet pipe 16 into an upper pipe and a lower pipe. The air outlet end of the upper pipe is connected to the first connecting pipe 8, and the air outlet end of the lower pipe is connected to the second connecting pipe 8. Two connecting pipes 9, the first connecting pipe 8 is connected to the bottom end of the first heat dissipation pipe 5, and the second connecting pipe 9 is connected to the bottom end of the second heat dissipation pipe 6; the adjusting plate 18 is rotatably connected to the end of the partition plate 17 near the cooling fan 4 via the rotating shaft 19, and a rotating rod 20 is fixed to the side end of the adjusting plate 18. The end of the rotating rod 20 placed outside the air inlet pipe 16 extends into the isolation box 37, and the rotating rod 20 extending into the isolation box 37 is fixedly connected to the middle part of the rotating plate 21; the first heat dissipation pipe 5 extending into the current and voltage transformer housing 3 is located at the upper end of the current and voltage transformer housing 3, and the second heat dissipation pipe 6 extending into the current and voltage transformer housing 3 is located at the lower end of the current and voltage transformer housing 3.

[0028] In this invention, openings 38 are formed on both sides of the current and voltage transformer housing 3, providing a channel for the installation and connection of the upper vertical tube 25, while balancing the air pressure inside the housing; the first inclined block 23 and the second inclined block 24 are arranged alternately inside the openings 38, and the outward inclined structure can prevent external dust, water vapor and other pollutants from entering the openings 38 and the inside of the current and voltage transformer housing 3, avoiding pollutants adhering to the surface of the components and affecting heat dissipation and sensing effect.

[0029] In this invention, the first retaining ring 26 is fixed to the upper inner wall of the upper riser 25, providing a sliding limit for the first plug 27 and preventing the first plug 27 from slipping off; the first plug 27 seals the upper end of the upper riser 25, sealing the transformer oil inside the upper riser 25 in the cavity; the second retaining ring 28 is fixed to the lower inner wall of the upper riser 25, providing a limit range for the upper and lower sliding of the second plug 29; the second plug 29 seals the connection between the upper riser 25 and the lower inclined pipe 30, ensuring the oil is sealed while transmitting expansion thrust.

[0030] In this invention, the third retaining ring 31 is fixed to the upper inner wall of the first bottom tube 14 and the second bottom tube 15, providing an upward limit for the sliding plate 32. The sliding plate 32 slides against the inner wall of the bottom tube, driving the connecting rod 33 to move synchronously. The fourth retaining ring 36 is fixed to the lower inner wall of the second bottom tube 15, providing support for the second spring 34. The second spring 34 is sleeved on the outside of the connecting rod 33, providing a restoring elastic force for the receiving plate 35 and the connecting rod 33.

[0031] In this invention, the isolation box 37 is wrapped around the outside of the rotating plate 21 to protect the internal transmission components from external interference and dust contamination. The rotating plate 21 forms a seesaw structure with its own center as the pivot point. One end is squeezed and rotated by the connecting rod 33, and the other end drives the rotating rod 20 to rotate. The first spring 22 provides a reset pull for the rotating plate 21. After the temperature recovers, the rotating plate 21 returns to its initial position. The partition 17 divides the air inlet pipe 16 into two channels, upper and lower, corresponding to the first heat dissipation pipe 5 and the second heat dissipation pipe 6, respectively, to realize the diversion and delivery of airflow. The rotating shaft 19 provides rotational support for the adjusting plate 18. When the adjusting plate 18 rotates around the rotating shaft 19, it smoothly changes the ventilation area of ​​the upper and lower channels.

[0032] Furthermore, the first heat sink 5 and the second heat sink 6 are evenly arranged inside the current and voltage transformer housing 3, and the tube walls are tightly bonded to epoxy resin, increasing the thermal contact area and improving the efficiency of heat absorption. The copper tube walls will not rust after long-term use, ensuring stable heat dissipation.

[0033] Both the first plug 27 and the second plug 29 are made of flexible sealing material, which can not only ensure the sealing effect of the oil inside the upper vertical pipe 25 and the lower inclined pipe 30, but also slide smoothly with the expansion of the transformer oil, without causing jamming or leakage.

[0034] The pivot point of the rotating plate 21 is made of wear-resistant material, so it will not wear out or jam after long-term rotation. The first spring 22 and the second spring 34 are both made of corrosion-resistant elastic components, so they will not lose elasticity after long-term use, thus ensuring the stability of the action reset.

[0035] The edges of the regulating plate 18 are smoothed so that it will not scratch the inner wall of the air inlet duct 16 when it is rotated. The rotation angle can smoothly change the ventilation area without blocking the airflow and can also accurately adjust the air volume.

[0036] Furthermore, the tilt angles of the first inclined block 23 and the second inclined block 24 are adapted to the structure of the opening 38, completely blocking the passage for pollutants to enter, while not hindering the installation of the upper riser 25 and the balance of air pressure.

[0037] The sliding plate 32 fits tightly against the inner walls of the first bottom tube 14 and the second bottom tube 15, and there will be no shaking or displacement during the sliding process, ensuring that the displacement force transmitted by the connecting rod 33 is accurate and stable.

[0038] The ranging sensor 13 adopts a non-contact ranging structure, which does not directly contact the receiving plate 35, and will not affect the normal movement of the receiving plate 35. The monitoring signal transmission is stable and the amplitude of the adjustment action is fed back in real time.

[0039] Working principle: After the current transformer is connected to the circuit and starts working, the primary coil 10, secondary coil 11 and iron core 12 will generate electromagnetic losses and dissipate a lot of heat. At this time, the cooling fan 4 starts synchronously and continuously delivers cooling airflow into the air inlet duct 16. After the airflow enters the air inlet duct 16, it is divided into upper and lower paths by the partition 17. The upper airflow flows into the first heat dissipation pipe 5 through the first connecting pipe 8, and the lower airflow flows into the second heat dissipation pipe 6 through the second connecting pipe 9. The first heat dissipation pipe 5 and the second heat dissipation pipe 6 are both made of copper, which quickly absorbs the heat inside the current and voltage transformer housing 3. When the airflow flows inside the heat dissipation pipe, it continuously carries the absorbed heat outward, thereby achieving cooling and temperature reduction inside the current and voltage transformer housing 3. At the same time, the first heat dissipation pipe 5 and the second heat dissipation pipe 6 are connected to the current and voltage transformer housing 3 and are grounded together. No floating potential will be generated during operation. Combined with the shielding effect of the current and voltage transformer housing 3, a stable anti-electromagnetic interference effect is achieved.

[0040] When the current transformer operates for a long time, the internal heat distribution will be uneven, with the upper area accumulating heat faster and the upper temperature being higher than the lower temperature. Long-term temperature difference will cause local overheating and accelerate component aging. At this time, the device will automatically activate the temperature difference regulation function to increase the heat dissipation airflow at the upper end and make the internal temperature more uniform. When the temperature at the upper end of the current and voltage transformer housing 3 is higher than the temperature at the lower end, the temperature inside the upper vertical tube 25 will be higher than the temperature inside the lower inclined tube 30. Both the upper vertical tube 25 and the lower inclined tube 30 are filled with transformer oil, and the expansion degree of the oil inside the upper vertical tube 25 will be greater than the expansion degree of the oil inside the lower inclined tube 30.

[0041] When the transformer oil inside the upper riser 25 is heated and expands, some of the transformer oil will push the first block 27 upward. After moving a certain distance, the first block 27 will be blocked by the first retaining ring 26. The other part of the transformer oil will push the second block 29 downward. The second block 29 slides downward along the interval between the second retaining rings 28, and then pushes the sliding plate 32 downward (by the transformer oil). The sliding plate 32 slides downward inside the first bottom tube 14 and the second bottom tube 15, causing the connecting rod 33 to move downward synchronously. When the connecting rod 33 in the second bottom tube 15 moves downward, it causes the receiving plate 35 to move downward synchronously, stretching the second spring 34. The ranging sensor 13 monitors the downward distance of the receiving plate 35 in real time and forms a calibration comparison signal.

[0042] When the connecting rod 33 inside the first bottom tube 14 moves downward, it directly presses one end of the rotating plate 21 downward. The rotating plate 21 rotates around its own center, with the force-bearing end rotating downward and the other end rotating upward. At the same time, it stretches the first spring 22, allowing it to store its elasticity and return to its original position. When the rotating plate 21 rotates, it drives the rotating rod 20 fixed in the middle to rotate synchronously. The rotating rod 20 transmits the rotational action to the adjusting plate 18, which rotates downward around the rotating shaft 19. After rotation, the opening between the adjusting plate 18 and the lower bottom wall of the air inlet pipe 16 becomes smaller, that is, the airflow channel to the second heat dissipation pipe 6 becomes narrower, and the opening between the adjusting plate 18 and the upper bottom wall of the air inlet pipe 16 becomes larger, that is, the airflow channel to the first heat dissipation pipe 5 becomes wider.

[0043] The cooling airflow delivered by the cooling fan 4 enters the first heat sink 5 through the first connecting pipe 8. The airflow inside the first heat sink 5 increases significantly, which can remove the heat accumulated at the top of the current and voltage transformer housing 3 more quickly and rapidly reduce the temperature at the top, so that the temperature at the top and bottom of the current and voltage transformer housing 3 gradually becomes more uniform, thus achieving uniform heat dissipation.

[0044] Throughout the heat dissipation and adjustment process, the first inclined block 23 and the second inclined block 24 inside the opening 38 continue to play a role. The interlocking inclined structure prevents external dust, water vapor, debris and other pollutants from entering the opening 38 and the inside of the current and voltage transformer housing 3, avoiding pollutants from adhering to the heat dissipation pipe, oil cavity and coil surface, and ensuring that the heat dissipation efficiency and anti-electromagnetic interference effect are not affected by pollution.

[0045] The device uses two sets of oil chambers, the upper vertical pipe 25 and the lower inclined pipe 30, to simultaneously sense the internal temperature distribution. One set of oil chambers drives the air volume adjustment action, while the other set works with the second bottom pipe 15, the receiving plate 35, and the distance sensor 13 to complete the monitoring and calibration. This effectively avoids the air volume adjustment error caused by the failure of the oil chamber sensing on one side, and ensures that the temperature adjustment action is accurate and reliable.

[0046] Once the temperature at the upper and lower ends of the current and voltage transformer housing 3 returns to uniformity, the expansion of the transformer oil inside the upper vertical pipe 25 and the lower inclined pipe 30 tends to be consistent. The first block 27, the second block 29, the sliding plate 32, and the connecting rod 33 gradually return to their initial positions. The first spring 22 releases its elastic force, pulling the rotating plate 21 to restore horizontal balance. The adjusting plate 18 then resets, and the airflow delivered by the air inlet pipe 16 to the first heat dissipation pipe 5 and the second heat dissipation pipe 6 returns to its initial balance. The second spring 34 drives the receiving plate 35 to reset, the ranging sensor 13 continuously monitors, and the device continues to operate stably, always maintaining uniform heat dissipation and stable electromagnetic interference resistance inside the transformer.

[0047] After the current transformer stops working, the cooling fan 4 stops running simultaneously. The transformer oil inside the upper vertical pipe 25 and the lower inclined pipe 30 cools and contracts, all moving parts are reset, the first inclined block 23 and the second inclined block 24 continue to block contaminants, and the copper heat dissipation pipe and the shell remain grounded and disturbance-free, waiting for the next start-up operation.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A current transformer with electromagnetic interference suppression function, comprising a first base plate (1) and a second base plate (2), characterized in that: The second base plate (2) is fixedly connected to the upper end of the first base plate (1), and a current and voltage transformer housing (3) is fixedly installed on the second base plate (2). The primary coil (10), secondary coil (11) and iron core (12) are fixedly installed inside the housing (3) of the current and voltage transformer by epoxy resin. A cooling fan (4) is fixedly installed on the upper end of the first base plate (1). The air outlet of the cooling fan (4) is connected to an air inlet pipe (16). The air outlet of the air inlet pipe (16) is connected to a first heat dissipation pipe (5) and a second heat dissipation pipe (6) respectively. The first heat dissipation pipe (5) and the second heat dissipation pipe (6) extend into the housing (3) of the current and voltage transformer. The two side walls inside the current and voltage transformer housing (3) are connected to upper vertical pipes (25), and the bottom ends of the two upper vertical pipes (25) are fixedly connected to lower inclined pipes (30). The bottom end of one of the lower inclined pipes (30) is connected to a first bottom pipe (14), and the bottom end of the other lower inclined pipe (30) is connected to a second bottom pipe (15). A connecting rod (33) is slidably connected inside the first bottom tube (14) and the second bottom tube (15). A receiving plate (35) is fixedly connected to the bottom end of the connecting rod (33) inside the second bottom tube (15). A distance measuring sensor (13) is fixedly connected to the upper end of the first bottom plate (1). An adjusting plate (18) is provided inside the air inlet pipe (16). The adjusting plate (18) is in transmission cooperation with the connecting rod (33) inside the first bottom tube (14). An exhaust pipe (7) is fixedly connected to the second base plate (2), and the air outlets of the first heat dissipation pipe (5) and the second heat dissipation pipe (6) are connected to the exhaust pipe (7).

2. The current transformer with anti-electromagnetic interference function according to claim 1, characterized in that: The current and voltage transformer housing (3) has openings (38) on both sides. A first inclined block (23) and a second inclined block (24) are provided in the openings (38). The first inclined block (23) is fixedly connected to the upper wall of the opening (38), and the second inclined block (24) is fixedly connected to the lower wall of the opening (38).

3. A current transformer with anti-electromagnetic interference function according to claim 2, characterized in that: The first inclined block (23) is located inside the opening (38) at one end facing the outside of the current and voltage transformer housing (3), and the second inclined block (24) is located inside the opening (38) at one end facing the inside of the current and voltage transformer housing (3). The upper end of the upper tube (25) is connected to the opening (38).

4. A current transformer with anti-electromagnetic interference function according to claim 1, characterized in that: A first retaining ring (26) is fixedly connected to the upper end of the pipe wall of the upper riser (25). A first blocking block (27) is slidably connected to the upper end of the pipe wall of the upper riser (25). Two second retaining rings (28) arranged one above the other are fixedly connected to the middle and lower end of the pipe wall of the upper riser (25). A second blocking block (29) is slidably connected to the middle and lower end of the pipe wall of the upper riser (25). The second blocking block (29) is located between the two second retaining rings (28).

5. A current transformer with anti-electromagnetic interference function according to claim 4, characterized in that: A third retaining ring (31) is fixedly connected to the upper end of the first bottom tube (14) and the second bottom tube (15). A sliding plate (32) is slidably connected to the upper end of the first bottom tube (14) and the second bottom tube (15) located below the third retaining ring (31). The upper end of the connecting rod (33) is fixedly connected to the bottom end of the sliding plate (32).

6. A current transformer with anti-electromagnetic interference function according to claim 5, characterized in that: A fourth retaining ring (36) is fixedly connected inside the lower end of the second bottom tube (15). A connecting rod (33) located inside the second bottom tube (15) passes through the fourth retaining ring (36). A second spring (34) is fixedly connected between the fourth retaining ring (36) and the receiving plate (35). The second spring (34) is sleeved on the connecting rod (33) inside the second bottom tube (15). The ranging sensor (13) is located directly below the receiving plate (35).

7. A current transformer with anti-electromagnetic interference function according to claim 5, characterized in that: An isolation box (37) is fixedly connected to the upper end of the first base plate (1). A rotating plate (21) is rotatably connected to the inner wall of the isolation box (37). The bottom end of the connecting rod (33) located in the first bottom tube (14) abuts against the upper surface of the rotating plate (21). A first spring (22) is fixedly connected between the bottom surface of the rotating plate (21) and the bottom wall of the isolation box (37).

8. A current transformer with anti-electromagnetic interference function according to claim 7, characterized in that: The inner wall of the air inlet pipe (16) is fixedly connected to a partition (17), which divides the air inlet pipe (16) into an upper pipe and a lower pipe. The air outlet end of the upper pipe is connected to a first connecting pipe (8), and the air outlet end of the lower pipe is connected to a second connecting pipe (9). The first connecting pipe (8) is connected to the bottom end of the first heat dissipation pipe (5), and the second connecting pipe (9) is connected to the bottom end of the second heat dissipation pipe (6).

9. A current transformer with anti-electromagnetic interference function according to claim 8, characterized in that: The adjustment plate (18) is rotatably connected to one end of the partition plate (17) near the cooling fan (4) via a rotating shaft (19). A rotating rod (20) is fixed to the side end of the adjustment plate (18). The end of the rotating rod (20) placed outside the air inlet pipe (16) extends into the isolation box (37). The rotating rod (20) extending into the isolation box (37) is fixedly connected to the middle part of the rotating plate (21).

10. A current transformer with anti-electromagnetic interference function according to claim 1, characterized in that: The first heat dissipation pipe (5) extending into the housing (3) of the current and voltage transformer is located at the upper end of the housing (3), and the second heat dissipation pipe (6) extending into the housing (3) of the current and voltage transformer is located at the lower end of the housing (3).

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