A full insulation pole-mounted vacuum circuit breaker with an external integrated isolating switch

Abstract

This invention discloses a fully insulated pole-mounted vacuum circuit breaker with an externally integrated disconnecting switch, belonging to the field of power system distribution network equipment manufacturing technology. It includes three-phase poles, a housing, a disconnector mounting base, and three-phase disconnector assemblies corresponding to the three-phase poles. The poles are configured as solid-sealed pole structures, internally integrating arc-extinguishing chambers, conductive rods, voltage and current sensors, and capacitor power extraction components. The three-phase poles are fixedly mounted on the housing, which contains an operating mechanism and a transmission mechanism. The disconnector mounting base is assembled and connected to the housing for assembling the three-phase disconnector assembly. The disconnector assembly includes a rotating shaft, an operating handle, a fully insulated pull rod, a fully insulated conductive clamp, a fully insulated contact plate-assembled disconnector, and a fully insulated outgoing terminal. This invention achieves complete insulation from the circuit breaker poles to the disconnector outgoing terminal, overcoming the shortcomings of existing products in terms of structure, sealing, environmental adaptability, and operational reliability.

Description

Technical Field

[0001] This invention relates to the field of power system distribution network equipment manufacturing technology, specifically to a fully insulated pole-mounted vacuum circuit breaker with an externally integrated disconnecting switch. Background Technology

[0002] Pole-mounted vacuum circuit breakers play a crucial role in the stable operation of power systems. When a line fault occurs, the circuit breaker can quickly disconnect the circuit, preventing the fault from escalating and avoiding equipment damage. The main function of the integrated disconnecting switch equipped with the circuit breaker is to establish a clearly visible break, provide electrical isolation, and ensure the safety of inspection and maintenance operations, while ensuring normal circuit control and protection.

[0003] Currently, pole-mounted vacuum circuit breakers with integrated disconnect switches widely used in power distribution networks are mostly exposed. During line operation, line faults caused by exposed live parts and foreign objects snagging on them account for over 30%. Exposed live parts present numerous problems. Exposed contact surfaces of the disconnectors and live parts provide entry points for animals to climb and intrude. Contact with external foreign objects can easily lead to phase-to-phase short circuits and grounding faults. When using insulating sleeves for insulation, the sleeves have poor sealing performance, allowing rainwater and dust to easily enter. The material ages, cracks, and peels due to high and low temperatures and ultraviolet radiation, resulting in a gradual decline in protective reliability. After the sleeve breaks, the equipment terminals are exposed. The sleeve has no insulation performance and affects operational safety, sometimes even requiring power outages. Therefore, there are significant shortcomings in terms of structure, sealing, environmental adaptability, and operational reliability. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a fully insulated pole-mounted vacuum circuit breaker with an externally integrated disconnecting switch, achieving complete insulation from the circuit breaker pole to the disconnecting blade outlet, thus overcoming the shortcomings of existing products in terms of structure, sealing, environmental adaptability, and operational reliability.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An externally integrated disconnecting switch, comprising a fully insulated pole-mounted vacuum circuit breaker, includes three-phase poles, a housing, a knife-side mounting frame, and three-phase knife-side assemblies corresponding to the three-phase poles. The poles are configured as solid-sealed poles, internally integrating an arc-extinguishing chamber, conductive rods, voltage and current sensors, and capacitor power-taking components. The three-phase poles are fixedly mounted on the housing. The housing contains an operating mechanism and a transmission mechanism. The knife-side mounting frame is assembled and connected to the housing for assembling the three-phase knife-side assemblies. Each knife-side assembly includes a rotating shaft, an operating handle, fully insulated pull rods, fully insulated conductive clamps, fully insulated contact plate-mounted knife-side assemblies, and fully insulated outgoing terminals. The rotating shaft passes through the knife-side mounting frame, connecting to three fully insulated pull rods respectively, and connects to the operating handle at its end. The fully insulated conductive clamp is configured as an outer cover made of insulating material and an internal conductive clamp is assembled. The fully insulated contact plate assembled partition is configured as an assembled structure in which the internal two side contact plates are wrapped with external fully insulated material. The fully insulated outgoing terminal adopts an assembly structure to assemble the outgoing terminal into the fully insulated insulator through insulating material. The fully insulated conductive clamp and the fully insulated outgoing terminal are respectively provided with boss one and boss two. The bottom of the fully insulated contact plate assembled partition is respectively provided with openings that are adapted to boss one and boss two. When the fully insulated contact plate assembled partition is closed, the two openings are completely sealed with boss one and boss two.

[0006] The fully insulated conductive clamp includes a conductive clamp insulating shell, a conductive clamp, and a conductive clamp insulating cover. The conductive clamp insulating shell is configured as an angular semi-open structure. The conductive clamp is fixedly assembled inside the conductive clamp insulating shell. The conductive clamp insulating cover is adapted to fit the conductive clamp insulating shell to form a fully insulated sealed structure. A boss is provided on the upper part of the conductive clamp insulating shell. The conductive part of the conductive clamp passes through the boss and is conductively connected to the fully insulated contact plate assembled knife when the circuit is closed.

[0007] The conductive clamp is fixedly assembled in a predetermined position inside the conductive clamp insulating shell by a number of bolts, and the conductive clamp insulating cover is provided with a number of blind holes that are compatible with the bolts.

[0008] The fully insulated contact plate assembled partition includes a partition insulating shell, contact plates on both sides of the partition, and partition insulating covers. The partition insulating shell is configured as a shell structure with open sides. The front of the partition insulating shell is provided with a groove and mounting hole that mate with the fully insulated conductive clip. An insulating fixing component is built into the middle space, and contact plates are fixedly installed on both sides to form the partition. The bottom of the partition insulating shell is provided with two trapezoidal openings that are adapted to the shape of boss one and boss two and can be tightly fastened. The two partition insulating covers are combined with the covers through mounting grooves provided on both sides of the partition insulating shell to form an integral insulating structure.

[0009] The two ends of the two contact plates are fixedly connected by bolts. A spring and a spring sleeve are sleeved on the outside of the bolts. A trapezoidal adjusting nut is provided at the end of the bolt to adjust the clamping force between the two contact plates.

[0010] The fully insulated outgoing terminal includes an outgoing terminal, an outgoing terminal insulating shell, and an outgoing terminal insulating cover. The outgoing terminal insulating shell is fixedly mounted on the supporting insulator. The outgoing terminal is fixed inside the outgoing terminal insulating shell by an assembly structure. The conductive part of the outgoing terminal protrudes from the upper part of the outgoing terminal insulating cover, and the wiring hole part protrudes from the side of the outgoing terminal insulating shell. When the circuit is closed, the conductive part of the outgoing terminal and the conductive part of the fully insulated conductive clamp are respectively inserted into the bottom opening of the fully insulated contact plate assembled blade for conductive connection and to form a fully insulated seal.

[0011] A limiting pin is provided between the two contact plates of the fully insulated contact plate assembly knife, and a bracket is provided on the top of the fully insulated outgoing terminal. When the circuit is closed, the limiting pin falls on the bracket.

[0012] The fully insulated pull rod is configured with an external insulating layer, which is connected to the fully insulated contact plate via a pivot pin, and insulating caps are installed in the connection holes on both sides.

[0013] Both the conductive clamp and the outgoing terminal of the fully insulated conductive clamp are L-shaped.

[0014] The beneficial effects of this invention are as follows: 1) This invention designs a fully insulated conductive clamp, a fully insulated contact plate assembled with a knife-type partition, and a fully insulated output terminal. The conductive components such as the copper conductive clamp, the copper knife-type contact plate, and the copper output terminal are fixed in the fully insulated material by assembly, which completely solves the problems of circuit failure caused by exposed live parts or incomplete insulation in traditional products, and improves the operational reliability and circuit stability of the switchgear. 2) The present invention provides a boss one, a boss two and a corresponding trapezoidal opening at the contact positions of the fully insulated conductive clamp, the fully insulated outgoing terminal and the fully insulated contact plate assembled knife-type switch, respectively. When the switch is closed, they are completely fitted together to form a sealed whole, which can play the functions of insulation, water conduction and preventing rainwater from entering. 3) The fully insulated contact plate assembly partition knife of the present invention fully assembles the two side contact plates inside and outside the insulating shell of the partition knife, and the insulating cover is fastened in the mounting groove on the outside. This not only prevents water from accumulating, but also reduces the overall width of the main conductive part of the partition knife, meeting the requirements of miniaturization; an adjustable clamping force fixing installation structure is set between the two side contact plates, and the fixing between the two contact plates and the clamping force adjustment are realized by bolts, springs, spring sleeves and trapezoidal adjusting nuts. 4) The present invention provides a limiting pin between the two contact plates of the fully insulated contact plate assembled blade, and a bracket is provided next to the upper conductive part of the fully insulated outgoing terminal. When the circuit is closed, the limiting pin falls on the bracket to prevent the impact between the two main components when the blade is closed. At the same time, when the outgoing terminal is subjected to external wiring tension, the limiting pin cooperates with the bracket to avoid deformation of the fully insulated outgoing terminal and displacement of conductive contact, thereby increasing reliability. 5) This invention abandons the T-shaped structure of conductive clamps and outgoing terminals in conventional products and adopts an L-shaped design, which has good guiding performance, can accurately close the circuit without alignment, has more reliable contact in the conductive system, strong current carrying capacity, and low temperature rise; 6) This invention also designs a fully insulated pull rod, and the pole adopts a deeply integrated solid-sealed pole structure. The pole integrates components that meet the sampling and power supply requirements of the power supply side and the load side, realizing full insulation of conductive components in all structures from the pole to the cutter outlet, ensuring reliable operation of the switch and line stability. The assembled design of the conductive clamp and outlet facilitates timely maintenance and replacement when problems occur, reducing line operation and maintenance costs, and is suitable for large-scale application in power grid distribution networks. Attached Figure Description

[0015] Figure 1 This is an assembly drawing of the single-sided spacer of the present invention; Figure 2 This is a schematic diagram of the blade assembly of the present invention; Figure 3 This is a schematic diagram of the overall structure of the fully insulated conductive clamp; Figure 4 This is a schematic cross-sectional view of a fully insulated conductive clamp. Figure 5 A schematic diagram of the fully insulated contact plate assembly-type partition knife; Figure 6 This is a schematic diagram of the internal structure of the insulating shell for the spacer. Figure 7 This is a schematic diagram of the spacer fixing structure; Figure 8 A schematic diagram of the fully insulated contact plate assembly-type blade (with the insulation cover on one side hidden). Figure 9 This is a schematic diagram of the fully insulated outgoing terminal structure; Figure 10 This is a partial schematic diagram of the structure of a fully insulated tie rod.

[0016] Detailed Implementation Invention The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0017] like Figure 1-2As shown, this externally integrated disconnecting switch, a fully insulated pole-mounted vacuum circuit breaker, includes three-phase poles 1, a housing 2, a knife-side mounting base 3, and three-phase knife-side assemblies 4 corresponding to the three-phase poles 1. The poles 1 are configured as solid-sealed poles, internally integrating an arc-extinguishing chamber, conductive rods, voltage and current sensors, and capacitor power-taking components. The three-phase poles 1 are fixedly mounted on the housing 2. The housing 2 contains an operating mechanism and a transmission mechanism. The knife-side mounting base 3 is assembled and connected to the housing 2 to assemble the three-phase knife-side assemblies 4. The knife-side assembly 4 includes a rotating shaft 41, an operating handle 42, fully insulated pull rods 43, fully insulated conductive clamps 44, fully insulated contact plate-mounted knife-side assemblies 45, and fully insulated outgoing terminals 46. The rotating shaft 41 passes through the knife-side mounting base 3, connects to the three fully insulated pull rods 43 respectively, and connects to the operating handle 42 at its end. The fully insulated conductive clamp 44 is configured as an outer cover made of insulating material and an internal conductive clamp is assembled. The fully insulated contact plate assembled blade 45 is configured as an assembled structure in which the internal two side contact plates are wrapped with external fully insulated material. The fully insulated outgoing terminal 46 adopts an assembly structure to assemble the outgoing terminal into the fully insulated insulator through insulating material. The fully insulated conductive clamp 44 and the fully insulated outgoing terminal 46 are respectively provided with a first boss 441 and a second boss 461. The bottom of the fully insulated contact plate assembled blade 45 is respectively provided with openings that are adapted to the first boss 441 and the second boss 461. When the fully insulated contact plate assembled blade 45 is closed, the two openings are completely sealed with the first boss 441 and the second boss 461.

[0018] like Figure 3-4 As shown, in a preferred embodiment, the fully insulated conductive clip 44 includes a conductive clip insulating shell 442, a conductive clip 443, and a conductive clip insulating cover 444. The conductive clip insulating shell 442 is configured as an angular semi-open structure. The conductive clip 443 is fixedly assembled inside the conductive clip insulating shell 442. The conductive clip insulating cover 444 is adapted to cover the conductive clip insulating shell 442 to form a fully insulated sealed structure. The boss 441 is provided on the upper part of the conductive clip insulating shell 442. The conductive part of the conductive clip 443 passes through the boss 441 and is electrically connected to the fully insulated contact plate assembled blade 45 when the circuit is closed.

[0019] Specifically, in this embodiment, the conductive clip 443 is fixedly assembled to a predetermined position within the conductive clip insulating shell 442 by a plurality of bolts, and the conductive clip insulating cover 444 has a plurality of blind holes adapted to the bolts. Of course, this is the simplest assembly method; other assembly structures that can achieve this function are all embodiments of the present invention.

[0020] like Figure 5-8As shown, in a preferred embodiment, the fully insulated contact plate assembled partition 45 includes a partition insulating shell 451, contact plates 452 on both sides of the partition, and partition insulating covers 453. The partition insulating shell 451 is configured as a shell structure with open sides. The front of the partition insulating shell 451 is provided with a groove and mounting hole that cooperate with the fully insulated conductive clip 44. The middle space contains an insulating fixing member 459 and the contact plates 452 are fixedly installed on both sides to form a partition. The bottom of the partition insulating shell 451 is provided with two trapezoidal openings that are adapted to the shape of the first boss 441 and the second boss 461 and can be tightly fastened. The two partition insulating covers 453 are combined with the covers through mounting grooves provided on both sides of the partition insulating shell 451 to form an integral insulating structure.

[0021] Specifically, in this embodiment, a fixing structure is provided that can adjust the clamping force between the two side contact plates 452. The two ends of the two side contact plates 452 are fixedly connected by bolts 454. A spring 455 and a spring sleeve 456 are sleeved on the outside of the bolts 454. A trapezoidal adjusting nut 457 is provided at the end of the bolts 454 to realize the adjustment of the clamping force between the two side contact plates 452.

[0022] like Figure 9 As shown, in a preferred embodiment, the fully insulated output terminal 46 includes an output terminal 462, an output terminal insulating shell 463, and an output terminal insulating cover 464. The output terminal insulating shell 463 is fixedly mounted on the supporting insulator 466 (made as an integral structure). The output terminal 462 is fixed inside the output terminal insulating shell 463 by an assembly structure. The conductive part of the output terminal 462 protrudes from the upper part of the output terminal insulating cover 464, and the wiring hole part protrudes from the side of the output terminal insulating shell 463. When the circuit is closed, the conductive part of the output terminal 462 and the conductive part of the conductive clip 443 of the fully insulated conductive clip 44 are respectively inserted into the bottom opening of the fully insulated contact plate assembled blade 45 to conduct electricity and form a fully insulated seal.

[0023] Specifically, in this embodiment, a limiting method to prevent closing impact is provided. A limiting pin 458 is provided between the two contact plates 452 of the fully insulated contact plate assembled blade 45, and a bracket 465 is provided on the top of the fully insulated output terminal 46. When closing, the limiting pin 458 falls on the bracket 465, which avoids the impact of the fully insulated contact plate assembled blade 45 on the fully insulated output terminal 46 when closing. At the same time, the fixing of the limiting pin and the bracket can prevent the fully insulated terminal 46 from deformation and conductive contact displacement caused by external wiring pressure, thereby increasing the reliability of switch operation.

[0024] like Figure 10As shown, in this preferred embodiment, the fully insulated pull rod 43 is configured with an external insulating layer covering the pull rod, which is connected to the fully insulated contact plate assembly-type partition 45 by a shaft pin, and insulating caps are provided in the connection holes on both sides to ensure the realization of the full insulation effect.

[0025] As a preferred embodiment, in this embodiment, both the conductive clamp 443 of the fully insulated conductive clamp 44 and the output terminal 462 of the fully insulated output terminal 46 are L-shaped, which facilitates assembly, provides good guiding performance, and allows for precise and smooth operation when closing the circuit.

[0026] In this embodiment, the top of the pole post 1 is the incoming terminal. The pole post 1 adopts a deeply integrated and solidified pole post form (existing products), which integrates arc-extinguishing chamber, voltage and current sensors, capacitor power supply and other components. The live parts are completely enclosed, resulting in low partial discharge and good insulation performance. The side outlet of the pole post 1 is connected to the fully insulated conductive clip 44 of the fully insulated disconnect switch. The mechanical linkage between the fully insulated conductive clip 44 and the fully insulated contact plate assembled blade 45 is achieved through the mechanical connection between the conductive clip insulating shell 442 and the blade insulating shell 451 (the specific structure of the existing product is not described in detail, but it is improved so that the external insulating shells of each are connected by mechanical connectors). When the blade is closed, the silver-plated part of one end of the fully insulated contact plate assembled blade 45 contacts the protruding conductive part of the fully insulated conductive clip 44, and the silver-plated part of the other end contacts the protruding conductive part of the outlet terminal of the fully insulated outlet end 46. That is, the two protruding conductive parts are inserted between the two contact plates 452 to form conductivity. When the circuit breaker is tripped, rotating the operating handle 42 and the shaft 41 drives the fully insulated pull rod 43 to move, supporting the fully insulated contact plate assembly knife 45 to move, so that the contact plate 452 is separated from the conductive clamp 443 and the outgoing terminal 462.

[0027] The circuit breaker and disconnector are interlocked. When both are closed, the disconnector cannot open; when the circuit breaker opens, the disconnector can open; and only after the disconnector closes can the circuit breaker close. This is a common functional structure for this type of product, and its operating principle and process will not be described in detail here. In summary, this invention achieves complete insulation from the pole to the disconnector's output terminal in a pole-mounted vacuum circuit breaker with an integrated disconnector, encasing all conductive components in insulating material. This ensures the stable and reliable operation of the product and completely solves the problem of line faults caused by insulation methods.

[0028] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A fully insulated pole-mounted vacuum circuit breaker with an externally integrated disconnecting switch, comprising three-phase poles (1), a housing (2), a knife-mounting base (3), and a three-phase knife-mounting assembly (4) corresponding to the three-phase poles (1). The poles (1) are configured as solid-sealed pole structures, internally integrating an arc-extinguishing chamber, a conductive rod, voltage and current sensors, and a capacitor power-taking component. The three-phase poles (1) are fixedly mounted on the housing (2). The housing (2) contains an operating mechanism and a transmission mechanism. The knife-mounting base (3) is assembled and connected to the housing (2) for assembling the three-phase knife-mounting assembly (4). The circuit breaker is characterized in that... The blade assembly (4) includes a rotating shaft (41), an operating handle (42), a fully insulated pull rod (43), a fully insulated conductive clamp (44), a fully insulated contact plate assembled blade (45), and a fully insulated output terminal (46). The rotating shaft (41) passes through the blade mounting base (3) and connects to the three fully insulated pull rods (43) respectively, and connects to the operating handle (42) at the end. The fully insulated conductive clamp (44) is configured as an outer cover made of insulating material and an internal conductive clamp is assembled. The fully insulated contact plate assembled partition (45) is configured as an assembled structure with the internal two side contact plates wrapped by the external fully insulated material. The fully insulated output terminal (46) adopts an assembly structure to assemble the output terminal into the fully insulated insulator through insulating material. The fully insulated conductive clamp (44) and the fully insulated output terminal (46) are respectively provided with boss one (441) and boss two (461). The bottom of the fully insulated contact plate assembled partition (45) is respectively provided with openings that are adapted to boss one (441) and boss two (461). When the fully insulated contact plate assembled partition (45) is closed, the two openings are completely sealed and matched with boss one (441) and boss two (461).

2. The fully insulated pole-mounted vacuum circuit breaker with an externally integrated disconnecting switch according to claim 1, characterized in that, The fully insulated conductive clip (44) includes a conductive clip insulating shell (442), a conductive clip (443), and a conductive clip insulating cover (444). The conductive clip insulating shell (442) is configured as an angular semi-open structure. The conductive clip (443) is fixedly assembled inside the conductive clip insulating shell (442). The conductive clip insulating cover (444) is adapted to cover the conductive clip insulating shell (442) to form a fully insulated sealed structure. The boss (441) is located on the upper part of the conductive clip insulating shell (442). The conductive part of the conductive clip (443) passes through the boss (441) and is electrically connected to the fully insulated contact plate assembled blade (45) when the circuit is closed.

3. The fully insulated pole-mounted vacuum circuit breaker with an externally integrated disconnecting switch according to claim 2, characterized in that, The conductive clip (443) is fixedly assembled in a predetermined position inside the conductive clip insulating shell (442) by a number of bolts, and the conductive clip insulating cover (444) is provided with a number of blind holes that are compatible with the bolts.

4. The fully insulated pole-mounted vacuum circuit breaker with an externally integrated disconnecting switch according to claim 1, characterized in that, The fully insulated contact plate assembled partition knife (45) includes a partition knife insulating shell (451), contact plates (452) on both sides of the partition knife, and partition knife insulating cover (453). The partition knife insulating shell (451) is configured as a shell structure with open sides. The front of the partition knife insulating shell (451) is provided with a groove and mounting hole that cooperate with the fully insulated conductive clip (44). The middle space has an insulating fixing piece (459) built in and contact plates (452) are fixedly installed on both sides to form a partition knife. The bottom of the partition knife insulating shell (451) is provided with two trapezoidal openings that are adapted to the shape of boss one (441) and boss two (461) and can be tightly fastened. The two partition knife insulating covers (453) are combined with the covers through the mounting grooves provided on both sides of the partition knife insulating shell (451) to form an integral insulating structure.

5. A fully insulated pole-mounted vacuum circuit breaker with an externally integrated disconnecting switch as described in claim 4, characterized in that, The two ends of the two contact plates (452) are fixedly connected by bolts (454). A spring (455) and a spring sleeve (456) are sleeved on the outside of the bolts (454). A trapezoidal adjusting nut (457) is provided at the end of the bolts (454) to realize the adjustment of the clamping force between the two contact plates (452).

6. The fully insulated pole-mounted vacuum circuit breaker with an externally integrated disconnecting switch according to claim 1, characterized in that, The fully insulated outgoing terminal (46) includes an outgoing terminal (462), an outgoing terminal insulating shell (463), and an outgoing terminal insulating cover (464). The outgoing terminal insulating shell (463) is fixedly mounted on the supporting insulator (466). The outgoing terminal (462) is fixed inside the outgoing terminal insulating shell (463) by an assembly structure. The conductive part of the outgoing terminal (462) protrudes from the upper part of the outgoing terminal insulating cover (464), and the wiring hole part protrudes from the side of the outgoing terminal insulating shell (463). When the circuit is closed, the conductive part of the outgoing terminal (462) and the conductive part of the conductive clip (443) of the fully insulated conductive clip (44) are respectively inserted into the bottom opening of the fully insulated contact plate assembled blade (45) for conductive connection and to form a fully insulated seal.

7. A fully insulated pole-mounted vacuum circuit breaker with an external integrated disconnecting switch according to claim 6, characterized in that a limiting pin (458) is provided between the two side contact plates (452) of the fully insulated contact plate assembled blade (45), and a bracket (465) is provided on the top of the fully insulated outgoing terminal (46), and the limiting pin (458) falls on the bracket (465) when the circuit is closed.

8. The fully insulated pole-mounted vacuum circuit breaker with an externally integrated disconnecting switch according to claim 1, characterized in that, The fully insulated pull rod (43) is configured to have an external insulation layer, and is connected to the fully insulated contact plate assembly blade (45) by a shaft pin, and has an insulation cap in the connection holes on both sides.

9. A fully insulated pole-mounted vacuum circuit breaker with an externally integrated disconnecting switch as described in claim 6, characterized in that, The conductive clamp (443) of the fully insulated conductive clamp (44) and the output terminal (462) of the fully insulated output terminal (46) are both L-shaped.

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