A primary and secondary fused integrated pole-mounted circuit breaker

Abstract

The application relates to the technical field of power electronic components, and specifically discloses a fast-assembled primary-secondary fusion complete set of pole-mounted circuit breaker, which comprises a control box, a fixing frame is detachably connected to the outer surface of the control box, an insulating seat for supporting a vacuum arc-extinguishing chamber is fixedly connected to the outer surface of the upper end of the control box, a mutual inductor is arranged outside the insulating seat, an insulating support is arranged on the upper side of the fixing frame, and a moving contact is fixedly connected to the upper side of the insulating support. The early warning assembly is arranged, the indicating lamp flashes, the problem of poor contact of the corresponding number of knife switches can be intuitively reflected, the contact between the knife switch and the moving contact can be accurately judged in the closed state of the circuit breaker, the occurrence probability of subsequent faults of the circuit breaker can be reduced, the workload of maintenance personnel in column climbing maintenance can be reduced, the maintenance difficulty of the pole-mounted circuit breaker can be effectively reduced, and the convenience in the maintenance process can be improved.

Description

Technical Field

[0001] This invention relates to the field of power electronic components technology, and in particular to a rapid assembly of a primary and secondary integrated pole-mounted circuit breaker. Background Technology

[0002] Pole-mounted circuit breakers are core switching devices installed on overhead power line poles in power distribution networks. They are mainly used for power distribution, fault isolation, and control of the lines. They are key devices to ensure the safe operation of the power distribution network and the reliability of power supply. Their core functions are to realize overload and short-circuit protection of the lines, quickly isolate faulty sections, and ensure normal power supply to non-faulty areas. The primary and secondary integration technology highly integrates primary and secondary equipment, solving problems such as interface mismatch and equipment incompatibility.

[0003] For example, Chinese patent CN220543815U discloses a primary and secondary integrated pole-mounted circuit breaker. This device uses two clamping blocks to clamp the pole and uses rubber pads to prevent slippage. The clamping blocks, mounting plate and clamping plate are used to initially fix the pole-mounted circuit breaker, making the installation more stable and convenient for workers.

[0004] When a pole-mounted circuit breaker is in the closed state, it needs to make contact with the contacts through the disconnector to ensure normal circuit flow. The pole-mounted circuit breaker is installed on the upper side of the utility pole, and the wind blowing in the air can easily cause the disconnector and contacts to loosen, which can lead to poor circuit contact and increase the failure rate of the power grid. Moreover, during fault repair, since the disconnector and contacts are both installed at a high position, they cannot be directly observed with the naked eye. Therefore, maintenance personnel need to climb the pole frequently for inspection, which will increase the labor intensity and workload of maintenance personnel to a certain extent. Summary of the Invention

[0005] The purpose of this invention is to provide a quick-assembly, integrated primary and secondary pole-mounted circuit breaker that can accurately determine the contact status between the disconnector and the moving contact when the circuit breaker is closed, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a quick-assembly primary and secondary integrated pole-mounted circuit breaker, comprising a control box, a fixing frame detachably connected to the outer surface of the control box, an insulating base for supporting a vacuum interrupter fixedly connected to the upper outer surface of the control box, a current transformer disposed on the outer side of the insulating base, an insulating support column disposed on the upper side of the fixing frame, a moving contact fixedly connected to the upper side of the insulating support column, and a switching assembly disposed between the moving contact and the current transformer;

[0007] The switching component includes a knife switch, and an early warning component is provided between the knife switch and the moving contact. The early warning component includes a sensing plate embedded in the inner wall of the knife switch, an electrode plate fixedly connected to the outer surface of the moving contact, the outer surface of the electrode plate being in contact with the sensing plate, and an indicator light provided on the front side of the fixing frame.

[0008] Preferably, the number of electrode plates is two sets and they are symmetrically distributed. The outer surface of the electrode plates is arc-shaped and made of elastic material. The knife switch has a U-shaped cross-section. The induction plate, electrode plates and indicator lights are electrically connected to the internal control system of the circuit breaker.

[0009] Preferably, an expansion assembly is provided on the inner side of the moving contact. The expansion assembly includes an embedded groove that extends through the outer surface of the moving contact. A heat-conducting plate is fixedly connected to the inner surface of the groove. An expansion sleeve is fixedly connected to the outer surface of the heat-conducting plate. A sliding plate is slidably connected to the inner side of the groove. A top block is fixedly connected to the outer surface of the sliding plate. The top block is in contact with the inner surface of the electrode plate.

[0010] Preferably, the number of expansion sleeves, sliding plates, and top blocks are all in two sets and symmetrically distributed on both sides of the heat-conducting plate. The outer surface of the expansion sleeve away from the heat-conducting plate is fixedly connected to the outer surface of the sliding plate. The expansion sleeve is made of high-temperature resistant elastic material, and the inner side of the expansion sleeve is filled with thermal expansion gas. The electrode plate covers both ends of the slide groove.

[0011] Preferably, a compensation component is provided on the inner side of the top block. The compensation component includes a storage groove embedded in the inner side of the top block. A spring is fixedly connected to the inner surface of the storage groove, and the side of the spring away from the top block is fixedly connected to the outer surface of the electrode plate.

[0012] Preferably, a stationary contact is fixedly connected to the outer surface of the front end of the current transformer, a movable pin is rotatably connected to the outer surface of the stationary contact, the outer surface of the movable pin is fixedly connected to the knife switch, and an insulating pull rod is hinged to the lower side of the inner surface of the knife switch.

[0013] Preferably, the outer surface of the fixed frame is damped and rotatably connected to a drive shaft, the outer surface of the drive shaft is fixedly connected to a cam, the lower end of the outer surface of the insulating pull rod is fixedly connected to a connecting block, the lower end of the outer surface of the connecting block is embedded with an installation groove, the inner surface of the installation groove is fixedly connected to a pin, the connecting block is rotatably connected to the cam through the pin, and the right end of the drive shaft is fixedly connected to a swing arm.

[0014] Preferably, a lubrication assembly is provided on the inner side of the movable pin. The lubrication assembly includes a storage cavity and an injection hole embedded in the inner side of the movable pin. One end of the injection hole is connected to the inside of the storage cavity, and the other end extends to the outside of the storage cavity. A limiting cavity is embedded in the inner side of the pin.

[0015] Preferably, an overflow channel is embedded inside the movable pin, and the upper and lower ends of the overflow channel are respectively connected to the limiting cavity and the storage cavity. The limiting cavity is conical in shape, and a ball bearing is rotatably connected inside the limiting cavity. A limiting groove is embedded on the outer surface of the movable pin, and a stop block is fixedly connected to the outer surface of the stationary contact inside the limiting groove. The outer surface of the stop block is arc-shaped.

[0016] Preferably, a vacuum interrupter is fixedly connected to the outer surface of the upper end of the insulating base, an input terminal is fixedly connected to the upper end of the vacuum interrupter, and an output terminal is fixedly connected to the outer surface of the moving contact.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. This solution, by setting up an early warning component, can intuitively reflect the problem of poor contact of the corresponding number of disconnectors through the flashing of the control indicator light. This allows for accurate judgment of the contact between the disconnector and the moving contact when the circuit breaker is closed, thereby reducing the probability of subsequent circuit breaker failures. It also reduces the workload of maintenance personnel climbing the pole for inspection, thus effectively reducing the difficulty of inspecting pole-mounted circuit breakers and improving the convenience of the maintenance process.

[0019] 2. This solution, by setting up an expansion component, uses a top block to compress the electrode plate, thereby increasing the deformation range of the electrode plate to a certain extent. This effectively increases the compressive force between the electrode plate and the sensing plate, ensuring a tight fit between them. This effectively reduces the risk of loosening between the switch and the moving contact, leading to poor contact, and further improves the safety and stability of the pole-mounted circuit breaker during operation.

[0020] 3. This solution incorporates a lubrication assembly, allowing lubricant to flow between the moving pin and the stationary contact. This lubricant not only lubricates the area between the moving pin and the stationary contact, making the switch rotation smoother and improving accuracy during opening and closing, but also fills the gap between them. This effectively reduces resistance changes caused by the gap, helping to lower the risk of abnormal temperature rise at the stationary contact. Furthermore, it effectively improves the conductivity between the moving pin and the switch. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a top view of the overall structure of the present invention;

[0024] Figure 3 For the present invention Figure 2 Sectional view along line AA;

[0025] Figure 4 For the present invention Figure 2 Sectional view along the BB direction;

[0026] Figure 5 For the present invention Figure 3 Enlarged view of point C in the middle;

[0027] Figure 6 For the present invention Figure 4 Enlarged view of point D;

[0028] Figure 7 For the present invention Figure 3 Enlarged view of point E in the middle;

[0029] Figure 8 For the present invention Figure 5 Enlarged diagram of point F in the middle.

[0030] Explanation of reference numerals in the attached figures:

[0031] 11. Control box; 12. Input terminal; 13. Vacuum interrupter; 14. Insulating base; 15. Current transformer; 16. Knife switch; 17. Fixing frame; 18. Output terminal; 19. Insulating support; 20. Insulating tie rod; 21. Swing arm; 22. Drive shaft; 23. Cam; 24. Connecting block; 25. Mounting slot; 26. Pin; 27. Stationary contact; 28. Movable pin; 29. ​​Storage chamber; 30. Injection hole; 31. Overflow channel; 32. Limiting chamber; 33. Ball bearing; 34. Limiting groove; 35. Stop block; 36. Moving contact; 37. Induction plate; 38. Slide groove; 39. Slide plate; 40. Electrode plate; 41. Heat-conducting plate; 42. Expansion sleeve; 43. Top block; 44. Storage slot; 45. Spring; 46. Indicator light. Detailed Implementation

[0032] 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.

[0033] Please see Figures 1 to 8 The present invention provides a technical solution:

[0034] A quick-assembly integrated primary and secondary pole-mounted circuit breaker includes a control box 11. A fixing frame 17 is detachably connected to the outer surface of the control box 11. An insulating base 14 for supporting a vacuum interrupter 13 is fixedly connected to the upper outer surface of the control box 11. A current transformer 15 is arranged on the outside of the insulating base 14. An insulating support column 19 is arranged on the upper side of the fixing frame 17. A moving contact 36 is fixedly connected to the upper side of the insulating support column 19. A switching assembly is arranged between the moving contact 36 and the current transformer 15.

[0035] The switching assembly includes a knife switch 16, and an early warning assembly is provided between the knife switch 16 and the moving contact 36. The early warning assembly includes a sensing plate 37 embedded in the inner wall of the knife switch 16, an electrode plate 40 fixedly connected to the outer surface of the moving contact 36, and the outer surface of the electrode plate 40 in contact with the sensing plate 37. An indicator light 46 is provided on the front side of the mounting bracket 17.

[0036] There are two sets of electrode plates 40, which are symmetrically distributed. The outer surface of the electrode plate 40 is arc-shaped and made of elastic material. The knife switch 16 has a U-shaped cross-section. The induction plate 37, electrode plate 40 and indicator light 46 are electrically connected to the internal control system of the circuit breaker.

[0037] By adopting the above technical solution, when the pole-mounted circuit breaker is in operation, an electric arc will be generated when the moving contact 36 separates from the knife switch 16 during circuit breaker opening. The vacuum interrupter 13 suppresses the maintenance of the electric arc through the high vacuum environment pressure, so that the electric arc is quickly extinguished when the current naturally crosses zero. At the same time, combined with the longitudinal magnetic field control technology, the arc energy can be effectively dispersed to avoid local overheating, so that the interrupter can stably interrupt the high-voltage short-circuit current and meet the protection requirements of the high-voltage power grid. The current transformer 15 connected to the outside of the insulating base 14 is used to realize voltage conversion. The control module of the circuit breaker is set inside the control box 11. The fixing frame 17 is connected to the control box 11 by bolts. The control box 11 supports the fixing frame 17. The current transformer 15 is supported by the insulating base 14, and the fixing frame 17 is used to fix the insulating support 19. The stationary contact 27 on the surface of the current transformer 15 and the moving contact 36 on the upper side of the insulating support 19 are electrically connected through the disconnect switch 16. When the disconnect switch 16 and the moving contact 36 are in the closed state, the disconnect switch 16 and the moving contact 36 will maintain contact to achieve normal current flow. In order to accurately judge the contact state between the disconnect switch 16 and the moving contact 36, an early warning component is set. The disconnect switch 16 has a U-shaped cross-section, and the moving contact 36 is used to contact the electrode plate 4. 0. Fixed installation. In the closed state, the disconnector 16 covers the moving contact 36. At this time, the sensing plate 37 inside the disconnector 16 will contact the outer surface of the electrode plate 40. The current transmitted from the disconnector 16 will be transmitted to the moving contact 36 through the sensing plate 37 and the electrode plate 40 in sequence, thereby maintaining stable circuit flow. When there is a problem of poor contact between the disconnector 16 and the moving contact 36, there will be a certain gap between the sensing plate 37 and the electrode plate 40. At this time, the sensing plate 37 will send an electrical signal to the control module, which will control the indicator light 46 to flash. To remind maintenance personnel to handle the issue promptly, when there is a problem with poor contact in the corresponding number of disconnectors 16, the indicator light 46 corresponding to that disconnector 16 will flash, further reducing the difficulty of maintenance. By setting up the early warning component, the contact status between the disconnector 16 and the moving contact 36 during the circuit breaker closing process can be accurately judged, thereby reducing the probability of subsequent circuit breaker failures. At the same time, it can also reduce the workload of maintenance personnel climbing the pole for maintenance, thus effectively reducing the difficulty of maintaining the pole-mounted circuit breaker and improving the convenience of the maintenance process.

[0038] Specifically, such as Figure 4 and Figure 6As shown, an expansion assembly is provided inside the moving contact 36. The expansion assembly includes a groove 38 embedded through the outer surface of the moving contact 36. A heat-conducting plate 41 is fixedly connected to the inner surface of the groove 38. An expansion sleeve 42 is fixedly connected to the outer surface of the heat-conducting plate 41. A sliding plate 39 is slidably connected to the inner side of the groove 38. A top block 43 is fixedly connected to the outer surface of the sliding plate 39. The top block 43 is in contact with the inner surface of the electrode plate 40. The side of the outer surface of the expansion sleeve 42 away from the heat-conducting plate 41 is fixedly connected to the outer surface of the sliding plate 39.

[0039] By adopting the above technical solution, in order to reduce the risk of poor contact between the disconnector 16 and the moving contact 36 due to wind blowing in the environment during continuous operation of the pole-mounted circuit breaker, an expansion assembly is set up. The expansion sleeve 42 is made of high-temperature resistant elastic material, and the electrode plate 40 covers both ends of the slide groove 38. When current flows between the disconnector 16 and the moving contact 36, the disconnector 16 and the moving contact 36 will continuously generate heat due to resistance. At this time, the heat will be transferred to the heat-conducting plate 41 inside the slide groove 38, so that the temperature of the heat-conducting plate 41 gradually increases. The heat of the heat-conducting plate 41 will be transferred to the interior of the expansion sleeve 42. The interior of the expansion sleeve 42 is filled with thermal expansion gas, so that the thermal expansion gas inside the expansion sleeve 42 gradually expands due to heat. As the volume of the expansion sleeve 42 gradually increases, the number of expansion sleeves 42, slide plates 39 and top blocks 43 are all in two sets and symmetrically distributed on both sides of the heat-conducting plate 41. The expansion sleeve 42 will push The sliding plate 39 moves away from the heat-conducting plate 41 inside the slide groove 38. During the movement, the sliding plate 39 drives the top block 43 to move synchronously. The top block 43 squeezes the electrode plate 40, thereby increasing the deformation range of the electrode plate 40 to a certain extent. This effectively increases the squeezing force between the electrode plate 40 and the sensing plate 37, keeping the electrode plate 40 and the sensing plate 37 in close contact. This effectively reduces the risk of loosening between the knife switch 16 and the moving contact 36, which could lead to poor contact. This further improves the safety and stability of the pole-mounted circuit breaker during operation.

[0040] Specifically, such as Figure 4 and Figure 6 As shown, a compensation component is provided inside the top block 43. The compensation component includes a storage groove 44 embedded inside the top block 43. A spring 45 is fixedly connected to the inner surface of the storage groove 44. The side of the spring 45 away from the top block 43 is fixedly connected to the outer surface of the electrode plate 40.

[0041] By adopting the above technical solution, in order to maintain a good contact between the disconnector 16 and the moving contact 36 and reduce the impact of ambient temperature changes on conductivity, a compensation component is set up. The receiving groove 44 inside the top block 43 is used to place the spring 45. Part of the spring 45 extends to the outside of the top block 43. The top block 43 applies a certain elastic force to the electrode plate 40 through the spring 45, so that the electrode plate 40 can always be kept in a convex state. When the ambient temperature around the pole-mounted circuit breaker decreases, the slide plate 39 will move in the opposite direction inside the slide groove 38. At this time, with the movement of the top block 43, the spring 45 will be elastically stretched a certain distance. The elastic deformation of the spring 45 can reduce the deformation amplitude of the electrode plate 40, thereby reducing the impact of the deformation of the electrode plate 40 on the contact effect between the moving contact 36 and the disconnector 16, and further improving the conductivity between the disconnector 16 and the moving contact 36.

[0042] Specifically, such as Figure 1 , Figure 2 and Figure 7 As shown, a stationary contact 27 is fixedly connected to the outer surface of the front end of the current transformer 15. A movable pin 28 is rotatably connected to the outer surface of the stationary contact 27. The outer surface of the movable pin 28 is fixedly connected to the knife switch 16. An insulating pull rod 20 is hinged to the lower side of the inner surface of the knife switch 16.

[0043] The outer surface of the fixed frame 17 is damped and rotatably connected to the drive shaft 22. The outer surface of the drive shaft 22 is fixedly connected to the cam 23. The lower outer surface of the insulating pull rod 20 is fixedly connected to the connecting block 24. The lower outer surface of the connecting block 24 is embedded with an installation groove 25. The inner surface of the installation groove 25 is fixedly connected to the pin 26. The connecting block 24 is rotatably connected to the cam 23 through the pin 26. The right end of the drive shaft 22 is fixedly connected to the swing arm 21.

[0044] A vacuum interrupter 13 is fixedly connected to the upper outer surface of the insulating base 14. An input terminal 12 is fixedly connected to the upper end of the vacuum interrupter 13, and an output terminal 18 is fixedly connected to the outer surface of the moving contact 36.

[0045] By adopting the above technical solution, the input terminal 12 on the upper side of the vacuum interrupter 13 is used for current input to the circuit breaker. The stationary contact 27 is rotatably supported by the movable pin 28, so that the disconnector 16 can rotate with the movable pin 28 as the fulcrum. The fixed frame 17 rotatably supports the drive shaft 22. The fixed frame 17, the swing arm 21 and the drive shaft 22 are all made of insulating material. When the pole-mounted circuit breaker is manually closed, the operator pulls the swing arm 21 with the insulating rod. The surface of the swing arm 21 has a through hole. The operator can quickly hook the swing arm 21 with the insulating rod to perform the closing operation. During the movement of the swing arm 21, it will drive the drive shaft 22 to rotate. During the rotation of the drive shaft 22, it will drive the convex surface of its convex part to rotate. Wheel 23 rotates synchronously. Cam 23 and insulating pull rod 20 are rotatably connected by pin 26. During the rotation of cam 23 with drive shaft 22 as fulcrum, it will drive connecting block 24 and insulating pull rod 20 to move downward through pin 26. The upper end of insulating pull rod 20 is hinged to the inside of knife switch 16 and will pull knife switch 16, so that knife switch 16 flips downward and locks onto the upper side of moving contact 36. Under the action of gravity and friction, knife switch 16 will keep in close contact with the surface of moving contact 36. At this time, the current output from transformer 15 is transmitted to knife switch 16 through stationary contact 27 and movable pin 28. The current is transmitted to moving contact 36 through knife switch 16. Moving contact 36 outputs the current outward through output terminal 18.

[0046] When the circuit breaker is opened, the swing arm 21 drives the cam 23 to rotate in the opposite direction. At this time, the protrusion of the cam 23 will rotate to the uppermost side. The cam 23 lifts the knife switch 16 upward through the insulating pull rod 20, thereby disengaging the knife switch 16 from the moving contact 36 and realizing the power disconnection. The drive shaft 22 and the fixed frame 17 are connected by damped rotation. The frictional resistance between the drive shaft 22 and the fixed frame 17 will keep the drive shaft 22 stable when there is no external force. The drive shaft 22 and the insulating pull rod 20 will distribute the weight of the knife switch 16, thereby keeping the position of the knife switch 16 stable.

[0047] Specifically, such as Figure 3 , Figure 5 and Figure 8 As shown, a lubrication assembly is provided inside the movable pin 28. The lubrication assembly includes a material storage cavity 29 and a material injection hole 30 embedded inside the movable pin 28. One end of the material injection hole 30 is connected to the inside of the material storage cavity 29, and the other end extends to the outside of the material storage cavity 29. A limiting cavity 32 is embedded inside the pin 26.

[0048] An overflow channel 31 is embedded inside the movable pin 28. The upper and lower ends of the overflow channel 31 are connected to the limiting cavity 32 and the storage cavity 29, respectively. The limiting cavity 32 is conical in shape and a ball bearing 33 is rotatably connected inside the limiting cavity 32. A limiting groove 34 is embedded on the outer surface of the movable pin 28. A stop block 35 is fixedly connected to the outer surface of the stationary contact 27 inside the limiting groove 34. The outer surface of the stop block 35 is arc-shaped.

[0049] By adopting the above technical solution, in order to improve the flexibility and stability of the opening and closing process of the knife gate 16, a lubrication component is set. First, an appropriate amount of lubricant is injected into the storage cavity 29 through the injection hole 30. A gate valve is set inside the injection hole 30. The lubricant is made of materials with excellent conductivity, such as powdered graphite. Some of the lubricant will enter the overflow channel 31 under the action of gravity. The conical limiting cavity 32 is used to place the ball 33. The ball 33 contacts the inner wall of the limiting cavity 32, so that the limiting cavity 32 can be sealed by the ball 33. The limiting groove 34 on the surface of the movable pin 28, together with the stop block 35, can limit the movable pin 28, so that the position of the movable pin 28 and the stationary contact 27 remains relatively stable. The outer surface of the movable pin 28 is fixedly connected to the knife gate 16. When the knife gate 16 is flipped, it will drive the movable pin 28 to rotate. When the stop block 35 comes into contact with the surface of the ball 33, the ball 33 moves toward the overflow channel 31 under the squeezing action of the stop block 35. At this time, the ball 33 will disengage from the inner wall of the limiting cavity 32, and some lubricant will slide down from the gap between the ball 33 and the inner wall of the limiting cavity 32. The lubricant will flow between the movable pin 28 and the stationary contact 27. The lubricant can not only lubricate between the movable pin 28 and the stationary contact 27, making the knife switch 16 flip more smoothly and improving the accuracy of the opening and closing process of the knife switch 16, but also fill the gap between the movable pin 28 and the stationary contact 27, thereby effectively reducing the resistance change caused by the gap between the two, helping to reduce the risk of abnormal temperature rise of the stationary contact 27, and also effectively improving the conductivity between the movable pin 28 and the knife switch 16.

[0050] Working principle: When the pole-mounted circuit breaker is manually closed, the drive shaft 22 rotates, causing the cam 23 on its surface to rotate synchronously. As the cam 23 rotates around the drive shaft 22, it drives the insulating pull rod 20 downwards via the pin 26. The insulating pull rod 20 is hinged to the inside of the disconnect switch 16, pulling the disconnect switch 16 and causing it to flip downwards and engage with the moving contact 36. Under the action of gravity and friction, the disconnect switch 16 remains tightly fitted to the surface of the moving contact 36. At this time, the sensing plate 37 inside the disconnect switch 16 contacts the outer surface of the electrode plate 40, and the current transmitted from the disconnect switch 16 sequentially... The circuit is maintained by transmitting signals through the induction plate 37 and electrode plate 40 to the moving contact 36. When there is poor contact between the knife switch 16 and the moving contact 36, a certain gap will exist between the induction plate 37 and the electrode plate 40. At this time, the induction plate 37 will send an electrical signal to the control module, which will control the indicator light 46 to flash to remind maintenance personnel to handle the problem in time. Due to the resistance, the knife switch 16 and the moving contact 36 will continuously generate heat, which will be transferred to the heat-conducting plate 41 inside the slide 38. This will cause the thermal expansion gas inside the expansion sleeve 42 to gradually expand, and the expansion sleeve 42 will push the slide 38. Plate 39 moves away from the heat-conducting plate 41 inside the slide groove 38. During its movement, the slide plate 39 drives the top block 43 to move synchronously, pressing the electrode plate 40. This increases the deformation range of the electrode plate 40 to a certain extent, effectively increasing the pressure between the electrode plate 40 and the sensing plate 37, ensuring a tight fit between them. When the ambient temperature around the pole-mounted circuit breaker decreases, the slide plate 39 moves in the opposite direction inside the slide groove 38. The elastic deformation of the spring 45 reduces the deformation range of the electrode plate 40, thereby reducing the impact of the electrode plate 40 deformation on the heat-conducting plate 40. The contact effect between the moving contact 36 and the knife switch 16 affects the contact effect of the ball 33. The ball 33 contacts the inner wall of the limiting cavity 32, thereby sealing the limiting cavity 32 through the ball 33. Under the squeezing action of the stop block 35, the ball 33 will move towards the overflow channel 31 side and will disengage from the inner wall of the limiting cavity 32. Some lubricant will slide down from the gap between the ball 33 and the inner wall of the limiting cavity 32. The lubricant can not only lubricate between the moving pin 28 and the stationary contact 27, but also fill the gap between the moving pin 28 and the stationary contact 27, thereby effectively reducing the resistance change caused by the gap between the two.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A quick-assembly integrated primary and secondary pole-mounted circuit breaker, comprising a control box (11), characterized in that: The outer surface of the control box (11) is detachably connected to a fixing frame (17). An insulating base (14) for supporting the vacuum interrupter (13) is fixedly connected to the upper outer surface of the control box (11). A current transformer (15) is provided on the outside of the insulating base (14). An insulating support column (19) is provided on the upper side of the fixing frame (17). A moving contact (36) is fixedly connected to the upper side of the insulating support column (19). A switching assembly is provided between the moving contact (36) and the current transformer (15). The switching component includes a knife switch (16), and an early warning component is provided between the knife switch (16) and the moving contact (36). The early warning component includes a sensing plate (37) embedded in the inner wall of the knife switch (16). An electrode plate (40) is fixedly connected to the outer surface of the moving contact (36). The outer surface of the electrode plate (40) is in contact with the sensing plate (37). An indicator light (46) is provided on the front side of the fixing frame (17).

2. The quick-assembly integrated primary and secondary pole-mounted circuit breaker according to claim 1, characterized in that: The number of electrode plates (40) is two sets and they are symmetrically distributed. The outer surface of the electrode plates (40) is arc-shaped and made of elastic material. The knife switch (16) has a U-shaped cross-section. The induction plate (37), electrode plates (40) and indicator lights (46) are electrically connected to the internal control system of the circuit breaker.

3. The quick-assembly integrated primary and secondary pole-mounted circuit breaker according to claim 2, characterized in that: An expansion assembly is provided inside the moving contact (36). The expansion assembly includes an embedded groove (38) that runs through the outer surface of the moving contact (36). A heat-conducting plate (41) is fixedly connected to the inner surface of the groove (38). An expansion sleeve (42) is fixedly connected to the outer surface of the heat-conducting plate (41). A sliding plate (39) is slidably connected inside the groove (38). A top block (43) is fixedly connected to the outer surface of the sliding plate (39). The top block (43) is in contact with the inner surface of the electrode plate (40).

4. A quick-assembly integrated primary and secondary pole-mounted circuit breaker according to claim 3, characterized in that: The number of expansion sleeves (42), sliding plates (39) and top blocks (43) are all in two sets and symmetrically distributed on both sides of the heat-conducting plate (41). The outer surface of the expansion sleeve (42) away from the heat-conducting plate (41) is fixedly connected to the outer surface of the sliding plate (39). The expansion sleeve (42) is made of high-temperature resistant elastic material. The inner side of the expansion sleeve (42) is filled with thermal expansion gas. The electrode plate (40) covers both ends of the slide groove (38).

5. A quick-assembly integrated primary and secondary pole-mounted circuit breaker according to claim 4, characterized in that: The top block (43) is provided with a compensation component. The compensation component includes a storage groove (44) embedded in the inside of the top block (43). A spring (45) is fixedly connected to the inner surface of the storage groove (44). The side of the spring (45) away from the top block (43) is fixedly connected to the outer surface of the electrode plate (40).

6. A quick-assembly integrated primary and secondary pole-mounted circuit breaker according to claim 5, characterized in that: A stationary contact (27) is fixedly connected to the outer surface of the front end of the current transformer (15). A movable pin (28) is rotatably connected to the outer surface of the stationary contact (27). The outer surface of the movable pin (28) is fixedly connected to the knife switch (16). An insulating pull rod (20) is hinged to the lower side of the inner surface of the knife switch (16).

7. A quick-assembly integrated primary and secondary pole-mounted circuit breaker according to claim 6, characterized in that: The outer surface of the fixed frame (17) is damped and rotatably connected to a drive shaft (22). The outer surface of the drive shaft (22) is fixedly connected to a cam (23). The lower outer surface of the insulating pull rod (20) is fixedly connected to a connecting block (24). The lower outer surface of the connecting block (24) is embedded with an installation groove (25). The inner surface of the installation groove (25) is fixedly connected to a pin (26). The connecting block (24) is rotatably connected to the cam (23) through the pin (26). The right end of the drive shaft (22) is fixedly connected to a swing arm (21).

8. A quick-assembly integrated primary and secondary pole-mounted circuit breaker according to claim 7, characterized in that: A lubrication assembly is provided inside the movable pin (28). The lubrication assembly includes a storage cavity (29) and an injection hole (30) embedded inside the movable pin (28). One end of the injection hole (30) is connected to the inside of the storage cavity (29), and the other end extends to the outside of the storage cavity (29). A limiting cavity (32) is embedded inside the pin (26).

9. A quick-assembly integrated primary and secondary pole-mounted circuit breaker according to claim 8, characterized in that: An overflow channel (31) is embedded inside the movable pin (28). The upper and lower ends of the overflow channel (31) are connected to the inside of the limiting cavity (32) and the storage cavity (29), respectively. The inside of the limiting cavity (32) is conical. A ball bearing (33) is rotatably connected inside the limiting cavity (32). A limiting groove (34) is embedded on the outer surface of the movable pin (28). A stop block (35) is fixedly connected inside the limiting groove (34) on the outer surface of the stationary contact (27). The outer surface of the stop block (35) is arc-shaped.

10. A quick-assembly integrated primary and secondary pole-mounted circuit breaker according to claim 9, characterized in that: A vacuum interrupter (13) is fixedly connected to the upper outer surface of the insulating base (14), an input terminal (12) is fixedly connected to the upper end of the vacuum interrupter (13), and an output terminal (18) is fixedly connected to the outer surface of the moving contact (36).

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