A fast current limiting device based on self-driving technology

Abstract

The application relates to the field of transformers, and particularly discloses a quick current-limiting device based on a self-driving technology, which comprises a shell, an input line end fixedly sleeved with a side edge wall plate of the shell and penetrating through the shell, a static contact of a circuit breaker connected with one end of the input line end located in the shell, an output conductive end connected with one end of the static contact of the circuit breaker away from the input line end, an L-shaped conductive wire connected with one end of the output conductive end away from the circuit breaker, and one end of the L-shaped conductive wire away from the circuit breaker connected with one end of a solenoid. Through the arrangement of the solenoid and the iron bar, the greater the short-circuit current is, the stronger the magnetism generated by the iron bar is, and the breaking action of the circuit breaker is accelerated with the increase of the short-circuit current, so that the reactor enters the circuit to limit the current, and the current-limiting speed is faster. The circuit breaker is disconnected through the lifting self-driving protection method of the iron bar, and the system complexity and high cost caused by adding a control system in the circuit are effectively avoided.

Description

Technical Field

[0001] This invention relates to a current limiting device, specifically a fast current limiting device based on self-driven technology, belonging to the field of transformers. Background Technology

[0002] Short circuit faults occur frequently in power systems. When a short circuit fault occurs, the powerful short circuit current can cause great damage to power system lines and equipment. Effective management of short circuit current has become an urgent and difficult task.

[0003] Existing fast current limiting devices based on self-driven technology still have certain shortcomings in use. Adding a circuit breaker and its control system to the circuit results in system complexity and high cost. Secondly, since the short-circuit current is much greater than the rated current, air breakdown can occur at the wire connection after the circuit breaker is opened, posing a certain safety hazard. Therefore, we propose a fast current limiting device based on self-driven technology. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a fast current limiting device based on self-driving technology.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A fast current limiting device based on self-driving technology includes a housing. An input line terminal is fixedly sleeved on one side of the housing and passes through the side wall panel of the housing. One end of the input line terminal located inside the housing is connected to the stationary contact of a circuit breaker. The end of the stationary contact of the circuit breaker away from the input line terminal is connected to an output conductive terminal. The end of the output conductive terminal away from the circuit breaker is connected to an L-shaped wire. The end of the L-shaped wire away from the circuit breaker is connected to one end of a solenoid coil. The circuit breaker is vertically mounted inside the housing and is located directly above the solenoid coil. An iron rod is inserted inside the solenoid coil, and the bottom end of the iron rod is fixedly connected to the bottom wall panel of the housing. The other end of the solenoid coil is connected to the output line terminal through a wire. One end of the output line terminal passes through the wall panel of the housing on the side away from the input line terminal. A reactor is connected in parallel with the circuit breaker, and the reactor is connected to both the input line terminal and the output wire.

[0007] Optionally, two air coolers for heat dissipation are provided on the inner top of the housing, with the output end of the air coolers facing the circuit breaker.

[0008] Optionally, the top wall panel of the housing is fixedly connected to two upright plates, and the bottom of the two upright plates is rotatably connected to a rotating shaft. A first gear is fixedly sleeved on the outer side of the center of the rotating shaft. The first gear is meshed with a first rack. A slide plate is fixedly connected to the bottom of the first rack. Slide rails are slidably sleeved on both sides of the slide plate. The two slide rails are fixedly connected to the housing. A door panel is hinged to one side of the housing. The two slide rails are located on the side of the housing away from the door panel.

[0009] Optionally, a second gear is fixedly sleeved on both sides of the first gear on the rotating shaft. The second gear is meshed with a second rack. The second rack is located on the side of the second gear away from the door panel. An L-shaped connecting rod is fixedly connected to the top of each of the two second racks. The end of the two L-shaped connecting rods away from the second racks is fixedly connected to the end of the insulating slide rod. The bottom of the insulating slide rod is fixedly connected to the circuit breaker. A piston plate is fixedly connected to the top of the insulating slide rod. The piston plate is slidably sleeved in the sleeve. A second spring is sleeved on the insulating slide rod above the L-shaped connecting rod. The two ends of the second spring are fixedly connected to the bottom of the piston plate and the inner bottom wall of the sleeve, respectively.

[0010] Optionally, grooves are provided on both sides of the end of the sliding plate away from the door panel. An air cylinder is fixedly connected in the groove. A guide rod is slidably sleeved in the air cylinder. A piston rod is fixedly connected to the end of the guide rod. The piston rod is slidably sleeved in the air cylinder. A first spring is fixedly connected to the end of the piston rod away from the guide rod. The end of the first spring away from the piston rod is fixedly connected to the inner bottom wall of the air cylinder. An L-shaped guide hole is provided on the guide rod. A one-way valve is provided in the L-shaped guide hole.

[0011] Optionally, one end of the L-shaped guide hole passes through the side wall plate of the guide rod, and the other end of the L-shaped guide hole passes through the end wall plate of the guide rod and communicates with the air cylinder. An oil storage tank is provided inside the slide plate, and the oil storage tank is connected to the air cylinder through an air inlet pipe. The air inlet pipe is located inside the slide plate, and the end of the air inlet pipe near the air cylinder passes through the air cylinder. An oil filling port for replenishing lubricating oil to the oil storage tank is provided on one side of the top of the slide plate, and oil replenishment ports for replenishing lubricating oil are provided on both sides of the slide plate.

[0012] Optionally, a U-shaped insulating sleeve is fitted onto the outside of the circuit breaker, and a U-shaped metal plate is fitted onto the outside of the U-shaped insulating sleeve.

[0013] Optionally, the magnitude of the short-circuit current is used to drive the circuit breaker to trip using the magnetic field formed by the driving iron rod and the solenoid coil, and the reactor is connected to the circuit for current limiting.

[0014] The beneficial effects of this invention are:

[0015] 1. By using a solenoid coil and an iron rod, the larger the short-circuit current, the stronger the magnetism generated by the iron rod, which in turn causes the U-shaped metal plate to descend faster. This significantly enhances the safety of the device, preventing damage to downstream electrical equipment due to excessive short-circuit current. Furthermore, the circuit breaker's tripping action accelerates with increasing short-circuit current, allowing the reactor to enter the circuit for current limiting, resulting in even faster current limiting. The iron rod's self-driven lifting protection method for tripping the circuit breaker effectively avoids the system complexity and high cost associated with adding a control system to the circuit.

[0016] 2. By using the sliding plate and the first rack, the device can effectively prevent air from forming a circuit at the connection between the input and output terminals. Furthermore, the sliding plate will block the circuit breaker at the position between the input and output terminals, further preventing air from forming a circuit at the input terminal connection and greatly improving the safety of the device.

[0017] 3. By setting up an oil reservoir and an oil replenishment port, the lubricating oil in the oil reservoir can enter the gap between the sliding plate and the two slide rails through the oil replenishment port. On the one hand, this can reduce the friction between the sliding plate and the slide rails, and on the other hand, it can prevent the slide rails and the sliding plate from rusting, which greatly improves the transmission efficiency between the sliding plate and the slide rails. Attached Figure Description

[0018] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the circuit connection of the present invention.

[0020] Figure 2 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 3 This is a schematic diagram of the overall structure of the present invention after the door panel is removed.

[0022] Figure 4 This is a partial cross-sectional view of the housing of the present invention.

[0023] Figure 5 This is a schematic diagram of the sleeve installation structure of the present invention.

[0024] Figure 6 This is a schematic diagram of the rotating shaft mounting structure of the present invention.

[0025] Figure 7 This is a schematic diagram of the skateboard of the present invention.

[0026] Figure 8 For the present invention Figure 7 The diagram shows an enlarged view of part A.

[0027] Figure 9 This is a schematic diagram of the oil filling port of the present invention.

[0028] Figure 10 This is a schematic diagram of the internal structure of the sleeve of the present invention.

[0029] In the diagram: 1. Housing; 2. Output terminal; 3. Input terminal; 5. Door panel; 7. Circuit breaker; 9. Iron rod; 10. Solenoid coil; 11. L-shaped conductor; 12. Slide rail; 13. First rack; 14. Vertical plate; 15. Rotating shaft; 16. First gear; 17. Second gear; 18. Second rack; 19. U-shaped metal plate; 20. U-shaped insulating sleeve; 21. Slide plate; 22. Insulating slide rod; 23. Air conditioner; 24. Oil inlet; 25. L-shaped connecting rod; 26. Guide rod; 27. L-shaped guide hole; 28. First spring; 29. ​​Oil reservoir; 30. Air inlet pipe; 31. Oil replenishment port; 32. Sleeve; 33. Second spring; 34. Piston plate. Detailed Implementation

[0030] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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.

[0031] Please see Figure 1-10 As shown, a fast current limiting device based on self-driving technology includes a housing 1. An input line terminal 3 is fixedly sleeved on one side of the housing 1 and passes through the side wall plate of the housing 1. One end of the input line terminal 3 inside the housing 1 is connected to the stationary contact of a circuit breaker 7. The end of the stationary contact of the circuit breaker 7 away from the input line terminal 3 is connected to an output conductive terminal. The end of the output conductive terminal away from the circuit breaker 7 is connected to an L-shaped wire 11. The end of the L-shaped wire 11 away from the circuit breaker 7 is connected to one end of a solenoid coil 10. The circuit breaker 7 can be lifted and installed inside the housing 1 and is located directly above the solenoid coil 10. An iron rod 9 is inserted inside the solenoid coil 10. The bottom end of the iron rod 9 is fixedly connected to the bottom wall plate of the housing 1. The other end of the solenoid coil 10 is connected to an output line terminal 2 through a wire. One end of the output line terminal 2 passes through the wall plate of the housing 1 on the side away from the input line terminal 3. A reactor is connected in parallel with the circuit breaker 7. The reactor is connected to the input line terminal 3 and the output wire respectively.

[0032] As a technical optimization of the present invention, two air coolers 23 for heat dissipation are provided on the inner top of the housing 1, with the output end of the air coolers 23 facing the circuit breaker 7. The air coolers 23 effectively neutralize the heat generated in the circuit due to the short-circuit current I, and also effectively protect the slide plate 21 and the first rack 13. The air coolers 23 are Xinkaitai KT18-X31A.

[0033] As a technical optimization of the present invention, the top wall panel of the housing 1 is fixedly connected to two upright plates 14, and the bottom of the two upright plates 14 is rotatably connected to a rotating shaft 15. A first gear 16 is fixedly sleeved on the outer side of the center of the rotating shaft 15. The first gear 16 meshes with a first rack 13. A sliding plate 21 is fixedly connected to the bottom of the first rack 13. Slide rails 12 are slidably sleeved on both sides of the sliding plate 21. The two slide rails 12 are fixedly connected to the housing 1. A door panel 5 is hinged to one side of the housing 1. The two slide rails 12 are located on the side of the housing 1 away from the door panel 5. The first rack 13 and the sliding plate 21 are both made of insulating rubber. On the one hand, this can effectively prevent air breakdown at the connector of the input line terminal 3. On the other hand, the setting of the air conditioner 23 can also effectively prevent the first rack 13 and the sliding plate 21 from melting due to overheating.

[0034] As a technical optimization of the present invention, a second gear 17 is fixedly sleeved on both sides of the first gear 16 on the rotating shaft 15. The second gear 17 is meshed with a second rack 18. The second rack 18 is located on the side of the second gear 17 away from the door panel 5. An L-shaped connecting rod 25 is fixedly connected to the top of each of the two second racks 18. The end of the two L-shaped connecting rods 25 away from the second rack 18 is fixedly connected to the end of the insulating slide rod 22. The bottom of the insulating slide rod 22 is fixedly connected to the circuit breaker 7. A piston plate 34 is fixedly connected to the top of the insulating slide rod 22. The piston plate 34 is slidably sleeved in the sleeve 32. A second spring 33 is sleeved above the L-shaped connecting rod 25 on the insulating slide rod 22. The two ends of the second spring 33 are fixedly connected to the bottom of the piston plate 34 and the inner bottom wall of the sleeve 32, respectively. Bearings are provided at the connection between the rotating shaft 15 and the two vertical plates 14. The inner ring of the bearing is fixedly sleeved on the outside of the rotating shaft 15, and the outer ring of the bearing is fixedly sleeved on the inside of the vertical plate 14. By setting the bearings, the rotational friction between the rotating shaft 15 and the vertical plate 14 is greatly reduced.

[0035] As an optimized technical solution of the present invention, grooves are provided on both sides of the end of the slide plate 21 away from the door panel 5. An air cylinder is fixedly connected to the groove, and a guide rod 26 is slidably sleeved inside the air cylinder. A piston rod is fixedly connected to the end of the guide rod 26 and slidably sleeved inside the air cylinder. A first spring 28 is fixedly connected to the end of the piston rod away from the guide rod 26, and the end of the first spring 28 away from the piston rod is fixedly connected to the inner bottom wall plate of the air cylinder. An L-shaped guide hole 27 is provided on the guide rod 26, and a one-way valve is provided in the L-shaped guide hole 27. The one-way valve only allows gas to enter the air cylinder through the outside.

[0036] As a technical optimization of the present invention, one end of the L-shaped guide hole 27 penetrates the side wall plate of the guide rod 26, and the other end of the L-shaped guide hole 27 penetrates the end wall plate of the guide rod 26 and communicates with the air cylinder. An oil storage tank 29 is provided inside the slide plate 21, and the oil storage tank 29 is connected to the air cylinder through an air inlet pipe 30. The air inlet pipe 30 is located inside the slide plate 21, and one end of the air inlet pipe 30 near the air cylinder penetrates the air cylinder. An oil filling port 24 for replenishing lubricating oil to the oil storage tank 29 is provided on one side of the top of the slide plate 21, and oil replenishment ports 31 for replenishing lubricating oil are provided on both sides of the slide plate 21. Lubricating oil for lubrication is pre-filled in the oil storage tank 29.

[0037] As a technical optimization of the present invention, a U-shaped insulating sleeve 20 is sleeved on the outside of the circuit breaker 7, and a U-shaped metal plate 19 is sleeved on the outside of the U-shaped insulating sleeve 20. The top inner wall plate of the U-shaped metal plate 19 is fixedly connected to the side of the insulating slide rod 22, and the U-shaped insulating sleeve 20 is made of insulating and thermally conductive rubber.

[0038] As a technical optimization of the present invention, the magnitude of the short-circuit current is used to drive the circuit breaker 7 to open by the magnetic field formed by the driving iron rod 9 and the solenoid coil 10, and the reactor is connected to the circuit for current limiting.

[0039] In use, the invention connects an externally preset reactor in parallel with the circuit breaker 7. After the door panel 5 is closed, the current enters the circuit breaker 7 through the input terminal 3. After passing through the circuit breaker 7, the current is connected to other electrical equipment through the output terminal 2 to maintain the normal operation of the circuit. When a short circuit fault occurs in the circuit, the current in the circuit increases, the magnetic field formed by the solenoid and the driving iron rod 9 is enhanced, which drives the circuit breaker 7 to move downward to perform the opening action. The reactor is connected to the circuit for current limiting.

[0040] After the circuit breaker 7 trips, the air conditioner 23 starts running, causing it to blow cold air. When the solenoid coil 10 is energized, it generates a magnetic field on the iron rod 9, making the iron rod 9 magnetic. During this process, the larger the short-circuit current I, the stronger the magnetism generated by the iron rod 9, which in turn causes the U-shaped metal plate 19 to descend faster, and the reactor to connect to the circuit for current limiting faster. This greatly enhances the safety of the device and prevents damage to subsequent power equipment due to excessive short-circuit current.

[0041] After the circuit breaker 7 descends, it will drive the insulating slide rod 22 to descend, and at the same time, it will compress the second spring 33. After the insulating slide rod 22 descends, it will drive the second rack 18 to descend through the L-shaped connecting rod 25. The meshing of the second rack 18 with the second gear 17 will cause the second gear 17 to rotate. The second gear 17 will drive the first gear 16 to rotate through the rotating shaft 15. The rotation of the first gear 16 will drive the slide plate 21 to move towards the door panel 5 through the first rack 13. When the slide plate 21 moves towards the door panel 5, the guide rod 26 will draw external gas into the air cylinder through the L-shaped guide hole 27 under the action of the elastic force of the first spring 28. And through the setting of the one-way valve, the lubricating oil in the oil storage tank 29 can be effectively prevented from flowing back into the air cylinder.

[0042] As the slide plate 21 slides, it moves to the input line terminal 3. During this process, the air cooler 23 is always blowing cold air. When the slide plate 21 moves to the input line terminal 3, the air cooler 23 blows cold air onto the slide plate 21. After the short-circuit current is generated, a lot of heat will be generated on the circuit line. The air cooler 23 can effectively cool the input line terminal 3 on the one hand, and effectively dissipate heat from the first rack 13 and the slide plate 21 on the other hand, preventing the large amount of heat generated by the wire from damaging the slide plate 21 and the first rack 13, and greatly improving the durability of the first rack 13 and the slide plate 21. When the slide plate 21 moves to below the input line end 3 and the output line end 2, the first rack 13 is located between the input line end 3 and the output conductive end. On the one hand, this effectively prevents the connection between the input line end 3 and the output conductive end from breaking down and forming a circuit. On the other hand, the slide plate 21 also blocks the circuit breaker 7 at the position of the input line end 3 and the output conductive end, further preventing the connection between the input line end 3 and the circuit breaker 7 from breaking down and forming a circuit, thus greatly improving the safety of the device.

[0043] After the short-circuit current disappears, the magnetism of the iron rod 9 will also decrease, which will cause the second spring 33 to drive the insulating slide rod 22 to rise through the piston plate 34, which in turn will drive the circuit breaker 7 to rise, re-establishing the electrical connection between the circuit breaker 7 and the input terminal 3 and the output conductive terminal, and the circuit will operate normally. During this process, the slide plate 21 will also move away from the door plate 5, so that the slide plate 21 will not obstruct the rise of the circuit breaker 7. After the insulating slide rod 22 rises, it will also drive the second rack 18 to rise through the L-shaped connecting rod 25, which in turn causes the second rack 18 to drive the second gear 17 to reverse. This causes the second gear 17 to drive the first gear 16 to reverse through the rotating shaft 15, which in turn causes the first gear 16 to drive the slide plate 21 to move away from the door panel 5 through the first rack 13. This causes the guide rod 26 to come into contact with the inner wall of the housing 1, compressing the first spring 28 and causing the gas in the air cylinder to enter the oil storage tank 29 through the air inlet pipe 30. This increases the air pressure in the oil storage tank 29, causing the lubricating oil in the oil storage tank 29 to enter the gap between the slide plate 21 and the sliding connection of the two slide rails 12 through the oil filling port 31. This reduces the friction between the slide plate 21 and the slide rails 12 and prevents rust between the slide rails 12 and the slide plate 21, greatly improving the transmission efficiency between the slide plate 21 and the slide rails 12.

[0044] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A fast current limiting device based on self-driving technology, comprising a housing (1), characterized in that, An input line terminal (3) is fixedly sleeved on one side of the housing (1), and the input line terminal (3) penetrates the side wall plate of the housing (1). One end of the input line terminal (3) located inside the housing (1) is connected to the stationary contact of the circuit breaker (7). The end of the stationary contact of the circuit breaker (7) away from the input line terminal (3) is connected to the output conductive terminal. The end of the output conductive terminal away from the circuit breaker (7) is connected to the L-shaped wire (11). The end of the L-shaped wire (11) away from the circuit breaker (7) is connected to one end of the solenoid coil (10). The circuit breaker (7) is installed inside the housing (1) and directly above the solenoid coil (10). An iron rod (9) is inserted inside the solenoid coil (10). The bottom end of the iron rod (9) is fixedly connected to the bottom wall plate of the housing (1). The other end of the solenoid coil (10) is connected to the output terminal (2) through a wire. One end of the output terminal (2) passes through the wall plate on the side of the housing (1) away from the input terminal (3). The circuit breaker (7) is connected in parallel with a reactor. The reactor is connected to the input terminal (3) and the output wire respectively. The top wall panel of the housing (1) is fixedly connected to two upright plates (14). The bottom of the two upright plates (14) is rotatably connected to a rotating shaft (15). A first gear (16) is fixedly sleeved on the outer side of the center of the rotating shaft (15). The first gear (16) is meshed with a first rack (13). The bottom of the first rack (13) is fixedly connected to a sliding plate (21). Slide rails (12) are slidably sleeved on both sides of the sliding plate (21). The two slide rails (12) are fixedly connected to the housing (1). A door panel (5) is hinged to one side of the housing (1). The two slide rails (12) are located on the side of the housing (1) away from the door panel (5).

2. The fast current limiting device based on self-driving technology according to claim 1, characterized in that, Two air coolers (23) for heat dissipation are provided on the inner top of the housing (1), and the output end of the air cooler (23) faces the circuit breaker (7).

3. The fast current limiting device based on self-driving technology according to claim 2, characterized in that, On the rotating shaft (15), a second gear (17) is fixedly sleeved on both sides of the first gear (16). The second gear (17) is meshed with a second rack (18). The second rack (18) is located on the side of the second gear (17) away from the door panel (5). The top of the two second racks (18) is fixedly connected to an L-shaped connecting rod (25). The end of the two L-shaped connecting rods (25) away from the second rack (18) is fixedly connected to the end of the insulating slide rod (22). The bottom of the insulating slide rod (22) is fixedly connected to the circuit breaker (7). The top of the insulating slide rod (22) is fixedly connected to a piston plate (34). The piston plate (34) is slidably sleeved in the sleeve (32). The insulating slide rod (22) is sleeved above the L-shaped connecting rod (25) with a second spring (33). The two ends of the second spring (33) are fixedly connected to the bottom of the piston plate (34) and the inner bottom wall of the sleeve (32), respectively.

4. A fast current limiting device based on self-driving technology according to claim 3, characterized in that, The sliding plate (21) has grooves on both sides at the end away from the door panel (5). An air cylinder is fixedly connected in the groove. A guide rod (26) is slidably sleeved in the air cylinder. A piston rod is fixedly connected to the end of the guide rod (26). The piston rod is slidably sleeved in the air cylinder. A first spring (28) is fixedly connected to the end of the piston rod away from the guide rod (26). The end of the first spring (28) away from the piston rod is fixedly connected to the inner bottom wall of the air cylinder. An L-shaped guide hole (27) is opened on the guide rod (26). A one-way valve is installed in the L-shaped guide hole (27).

5. A fast current limiting device based on self-driving technology according to claim 4, characterized in that, One end of the L-shaped guide hole (27) passes through the side wall of the guide rod (26), and the other end of the L-shaped guide hole (27) passes through the end wall of the guide rod (26) and is connected to the air cylinder. An oil storage tank (29) is provided inside the slide plate (21). The oil storage tank (29) is connected to the air cylinder through the air inlet pipe (30). The air inlet pipe (30) is located inside the slide plate (21) and the end of the air inlet pipe (30) close to the air cylinder passes through the air cylinder. An oil filling port (24) for replenishing lubricating oil to the oil storage tank (29) is provided on one side of the top of the slide plate (21). Oil replenishment ports (31) for replenishing lubricating oil are provided on both sides of the slide plate (21).

6. A fast current limiting device based on self-driven technology according to claim 5, characterized in that, The circuit breaker (7) is fitted with a U-shaped insulating sleeve (20) on its outer side, and a U-shaped metal plate (19) is fitted on the outer side of the U-shaped insulating sleeve (20).

7. A fast current limiting device based on self-driven technology according to claim 6, characterized in that, The magnitude of the short-circuit current is used to drive the circuit breaker (7) to open by the magnetic field formed by the driving iron rod (9) and the solenoid coil (10), and the reactor is connected to the circuit for current limiting.

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