A primary and secondary integrated pole-mounted circuit breaker

Abstract

This invention discloses a primary and secondary integrated pole-mounted circuit breaker, belonging to the technical field of pole-mounted circuit breakers. It includes a frame on which a solid-sealed pole, a disconnecting switch, and a grounding switch are mounted. The solid-sealed pole comprises an insulating shell, an active contact, a main stationary contact, a connecting rod, an insulating pull rod, and a moving conductive rod. A swing arm is mounted on the main shaft of the circuit breaker. A grounding contact seat is connected to the moving conductive rod via a flexible conductive element. A base, an auxiliary active contact, a secondary shaft, and a coil assembly are housed within the insulating pull rod. One end of the secondary shaft is connected to the auxiliary active contact, and the other end is fitted with a sliding sleeve. The outer ring of the sliding sleeve houses the coil assembly, which slides axially along the base. One end of the moving conductive rod extends into the insulating pull rod, and an auxiliary stationary contact is correspondingly mounted to the auxiliary active contact. In this invention, the induced voltage on the moving conductive rod is interrupted a second time through the auxiliary active contact and the auxiliary stationary contact, completely eliminating the risk of electric shock during maintenance and improving the overall operational reliability of the equipment.

Description

Technical Field

[0001] This invention relates to the field of pole-mounted circuit breaker technology, and more particularly to a primary and secondary integrated pole-mounted circuit breaker. Background Technology

[0002] Primary and secondary integrated pole-mounted circuit breakers are core equipment in distribution networks, widely used for segmentation, interconnection, and fault isolation of 10kV-35kV distribution lines. They can realize the interruption and closure of line current and grounding protection, ensuring the reliability of power supply in the distribution network. They typically integrate the functions of circuit breakers, disconnectors, and grounding switches, and achieve coordinated operation of various switching components through the main shaft drive within the rack, meeting the needs of distribution network automation control.

[0003] In the current use of primary and secondary integrated pole-mounted circuit breakers, the breaking distance after the circuit breaker is opened is generally short, which may cause residual induced voltage on the moving end conductive rod, posing a safety hazard if maintenance is performed. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a primary and secondary integrated pole-mounted circuit breaker.

[0005] The technical solution adopted by this invention is as follows: This application provides a primary and secondary integrated pole-mounted circuit breaker, including a frame. The frame includes an electrical cavity and a control cavity. The electrical cavity is provided with an isolation spindle, a circuit breaker spindle, a grounding spindle, and three sets of parallel-arranged switch assemblies. The switch assemblies include a solid-sealed pole, a disconnecting switch, and a grounding switch. The solid-sealed pole includes an insulating shell, an active contact, a main stationary contact, a connecting rod, an insulating pull rod, and a moving conductive rod. A swing arm is provided on the circuit breaker spindle. The swing arm, connecting rod, insulating pull rod, and moving conductive rod are sequentially connected to the active contact. A grounding contact seat is connected to the moving conductive rod through a flexible conductive element. A base is provided inside the insulating pull rod. The device comprises an auxiliary moving contact, a secondary shaft, and a coil assembly. One end of the secondary shaft is connected to the auxiliary moving contact, and the other end is fitted with a sliding sleeve. The outer ring of the sliding sleeve is fitted with a coil assembly, which slides along the axial direction of the base. One end of the moving conductive rod extends into the insulating pull rod and is fitted with an auxiliary stationary contact corresponding to the auxiliary moving contact. Before the active contact and the main stationary contact close, the coil assembly is energized to generate a magnetic field that drives the sliding sleeve to move. The sliding sleeve drives the secondary shaft to move, so that the auxiliary moving contact and the auxiliary stationary contact close in advance. After the active contact and the main stationary contact open, the coil assembly can be energized to generate a reverse magnetic field that drives the sliding sleeve to move. The sliding sleeve drives the secondary shaft to move, so that the auxiliary moving contact and the auxiliary stationary contact open.

[0006] In some embodiments, a pressure cap is provided at the end of the sliding sleeve away from the auxiliary moving contact, and a first spring is provided between the pressure cap and the base. When the coil assembly is energized and generates a magnetic field to drive the sliding sleeve to move, the pressure cap moves synchronously and compresses the first spring. When the coil assembly is de-energized, the auxiliary moving contact and the auxiliary stationary contact are disconnected under the action of the first spring.

[0007] In some embodiments, a first magnetic attractor is provided at one end of the sliding sleeve near the auxiliary moving contact, and a second magnetic attractor is provided on the base along the moving path of the first magnetic attractor. The first magnetic attractor and the second magnetic attractor form a magnetic attraction connection, so that the auxiliary moving contact and the auxiliary stationary contact remain closed when the coil assembly is de-energized.

[0008] In some embodiments, a second spring is provided between the sub-shaft and the pressure cap. The second spring is compressed synchronously with the first spring by the pressure cap, and the compression amount is greater than that of the first spring.

[0009] In some embodiments, a coil assembly power supply circuit is also included. The coil assembly power supply circuit includes a power supply, a controller, and a linkage switch disposed on the main shaft of the circuit breaker. The linkage switch includes a rotating disk that rotates synchronously with the main shaft of the circuit breaker, a moving contact, a stationary contact, a moving end wire, and a stationary end wire. The outer peripheral wall of the rotating disk forms a linkage surface, which includes a closed portion and a recessed portion. One end of the moving contact is connected to the moving end wire, and the other end abuts against the linkage surface. One end of the stationary contact is connected to the stationary end wire, and the other end is spaced apart from the moving contact. The moving end wire and the stationary end wire are connected between the controller and the coil assembly. The power supply is connected to the controller to supply power to the coil assembly. When the closed portion abuts against the moving contact, the moving contact and the stationary contact are connected, and the active contact and the main stationary contact are in an open state. When the recessed portion abuts against the moving contact, the moving contact and the stationary contact are disconnected, and the active contact and the main stationary contact are in a closed state.

[0010] In some embodiments, the flexible conductive element is connected to a conductive plate and is connected to a grounding contact via the conductive plate. The flexible conductive element includes a plurality of stacked conductive sheets, and the conductive sheets have spiral openings.

[0011] In some embodiments, both the active contact and the main stationary contact are provided with a first isolation cover.

[0012] In some embodiments, a second isolation cover is provided on the moving conductive rod between the insulating pull rod and the flexible conductive element.

[0013] In some embodiments, the solid-sealed pole is laterally disposed within the frame, and the disconnecting switch includes an inlet insulating arm, a disconnecting knife, a disconnecting rod, and a disconnecting swing block. The disconnecting swing block is disposed on the disconnecting main shaft and is connected to the disconnecting knife via the disconnecting rod. An disconnecting contact seat is disposed on the solid-sealed pole at one end near the main stationary contact. The disconnecting contact seat is laterally spaced from the disconnecting main shaft. The disconnecting knife is hinged to the disconnecting contact seat. The inlet insulating arm is disposed above the solid-sealed pole and has an inlet terminal block and an inlet contact seat disposed thereon.

[0014] In some embodiments, the grounding switch includes a grounding knife block disposed on a grounding spindle, and the grounding contact and the grounding spindle are laterally spaced apart.

[0015] The beneficial effects of the present invention are as follows: The present invention uses the auxiliary moving contact and the auxiliary stationary contact to perform secondary interruption of the induced voltage on the moving conductive rod, which completely eliminates the risk of electric shock during maintenance and improves the overall operational reliability of the equipment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0017] Figure 1 This is a schematic diagram of a primary and secondary integrated pole-mounted circuit breaker according to the present invention. Figure 1 ; Figure 2 This is a schematic diagram of a primary and secondary integrated pole-mounted circuit breaker according to the present invention. Figure 2 ; Figure 3 This is a partial schematic diagram of a primary and secondary integrated pole-mounted circuit breaker according to the present invention. Figure 1 ; Figure 4 This is a partial schematic diagram of a primary and secondary integrated pole-mounted circuit breaker according to the present invention. Figure 2 ; Figure 5 This is a schematic diagram of the linkage switch in this invention; Figure 6 This is a schematic diagram of the conductive sheet in this invention.

[0018] In the diagram: 1-Frame, 2-Isolation spindle, 3-Circuit breaker spindle, 30-Swing arm, 4-Grounding spindle, 5-Fixed pole, 50-Insulating housing, 51-Active contact, 52-Main stationary contact, 53-Connecting rod, 54-Insulating pull rod, 540-Base, 541-Auxiliary moving contact, 542-Auxiliary shaft, 543-Coil assembly, 544-Sliding sleeve, 545-Cover, 546-First spring, 547-First magnetic chuck, 548-Second magnetic chuck, 549-Second spring, 55-Moving conductive rod, 550-Auxiliary stationary contact Contact, 56-Flexible conductive element, 560-Spiral opening, 6-Disconnecting switch, 60-Incoming line insulating arm, 61-Disconnecting knife, 62-Disconnecting pull rod, 63-Disconnecting swing block, 64-Disconnecting contact seat, 65-Incoming line terminal block, 66-Incoming line contact seat, 7-Grounding switch, 70-Grounding contact seat, 71-Grounding knife, 80-Rotating disk, 81-Moving contact piece, 82-Stationary contact piece, 83-Moving end conductor, 84-Stationary end conductor, 85-Closed part, 86-Recessed part, 91-First isolation cover, 92-Second isolation cover. Detailed Implementation

[0019] The following description provides specific application scenarios and requirements for this specification, intended to enable those skilled in the art to make and use the contents of this specification. Various partial modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but rather to the widest scope consistent with the claims.

[0020] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "lateral", "radial", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element or component to have a specific orientation, or to be constructed and operated in a specific orientation.

[0021] It should be noted that the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different components and should not be construed as limiting the embodiments of this application.

[0022] It should be noted that the terms "installation," "setup," "equipped with," "connection," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral structures; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two devices, components, or parts.

[0023] It should be noted that the terms "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "in some embodiments," "exemplarily," and "for example" is intended to present related concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the above terms in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0024] Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] Regarding the accompanying drawings of this application, it should be clearly understood that the drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of this specification. It should also be understood that the drawings are not necessarily drawn to scale.

[0026] In existing primary and secondary integrated pole-mounted circuit breakers, the breaking distance of the contacts after the vacuum interrupter is short, and the moving conductive rod is prone to residual induced voltage. This residual voltage cannot be effectively released, resulting in a great risk of electric shock during maintenance work.

[0027] Based on the above issues, such as Figures 1 to 6 As shown, this application provides a primary and secondary integrated pole-mounted circuit breaker, including a frame 1. The frame 1 is provided with a fixing structure for assembly with a pole. This fixing structure can refer to corresponding fixing structures in the prior art to adapt to pole-mounted installation scenarios. The frame 1 includes an electrical cavity and a control cavity, which are separated by an insulating partition. The electrical cavity is the installation area for high-voltage components, and the control cavity is the low-voltage control area, used to arrange the operating mechanism and related control elements to achieve physical isolation between high and low voltage.

[0028] The electrical cavity is equipped with an isolation spindle 2, a circuit breaker spindle 3, a grounding spindle 4, and three sets of parallel switch assemblies, corresponding to phases A, B, and C of the three-phase distribution network, respectively. One end of the isolation spindle 2, the circuit breaker spindle 3, and the grounding spindle 4 extends into the control cavity and is linked with the operating mechanism inside the control cavity. This operating mechanism refers to the corresponding mechanism in the prior art to realize functions such as five-proof interlocking.

[0029] The switching assembly includes a solid-sealed pole 5, a disconnecting switch 6, and a grounding switch 7, forming an integrated functional unit for breaking, isolating, and grounding. The solid-sealed pole 5 is the core component for current breaking and insulation. Its insulating shell 50 uses epoxy resin as the base material and embeds an aluminum shielding mesh. The solid-sealed pole 5 includes an active contact 51, a main stationary contact 52, a connecting rod 53, an insulating pull rod 54, and a moving conductive rod 55. The main stationary contact 52 is fixed to one end of the insulating shell 50 by threads, forming a reliable connection with the external line. The active contact 51 and the moving conductive rod 55 are fixed by silver brazing and can move along the axial direction of the insulating shell 50 to realize the opening and closing action with the main stationary contact 52.

[0030] A swing arm 30 is fixedly mounted on the main shaft 3 of the circuit breaker. A hinge hole is provided at the end of the swing arm 3 furthest from the main shaft 3, and it is rotatably connected to the connecting rod 53 via a pin. The swing arm 30, connecting rod 53, insulating pull rod 54, moving conductive rod 55, and active contact 51 are sequentially connected. The insulating pull rod 54 is made of glass fiber reinforced epoxy resin, possessing excellent mechanical strength and insulation performance. When the main shaft 3 of the circuit breaker rotates under the drive of the operating mechanism, the swing arm 30 and connecting rod 53 convert the rotational motion into linear motion, driving the moving conductive rod 55 and the active contact 51 to move axially, thus realizing the opening and closing action with the main stationary contact 52.

[0031] The moving conductive rod 55 is made of oxygen-free copper, which has excellent conductivity. A flexible conductive element 56 is connected to it, and a grounding contact 70 is connected to the end of the flexible conductive element 56 away from the moving conductive rod 55. The insulating pull rod 54 is provided with a base 540, an auxiliary moving contact 541, a secondary shaft 542, and a coil assembly 543. One end of the moving conductive rod 55 extends into the insulating pull rod 54, and an auxiliary stationary contact 550 is provided corresponding to the auxiliary moving contact 541. The base 540 is fixedly installed inside the insulating pull rod 54. One end of the secondary shaft 542 is fixedly connected to the auxiliary moving contact 541. The auxiliary contact 541 is preferably made of insulating material because the auxiliary moving contact 541 and the auxiliary stationary contact 550 only need to be disconnected and do not need to conduct electricity. Using insulating material can better prevent the arc from being transmitted to the circuit breaker main shaft 3. The other end of the secondary shaft 542 is fitted with a sliding sleeve 544, which may be made of iron and has good magnetic conductivity, and can slide along the axial direction of the base 540 under the action of a magnetic field.

[0032] The outer ring of the sliding sleeve 544 is provided with a coil assembly 543. The coil assembly 543 is an epoxy casting structure, with enameled copper wire as the winding, wound on an epoxy resin skeleton, and can generate an axial magnetic field when energized.

[0033] Before the active contact 51 and the main stationary contact 52 close, the coil assembly 543 is energized to generate a positive magnetic field that drives the sliding sleeve 544 to move. The sliding sleeve 544 drives the secondary shaft 542 to move, so that the auxiliary moving contact 541 and the auxiliary stationary contact 550 are pre-closed, realizing pre-conduction of the circuit. After the active contact 51 and the main stationary contact 52 are opened, the coil assembly 543 can be energized to generate a reverse magnetic field that drives the sliding sleeve 544 to move. The sliding sleeve 544 drives the secondary shaft 542 to move, so that the auxiliary moving contact 541 and the auxiliary stationary contact 550 are opened, completely eliminating the residual induced voltage on the moving conductive rod 55, fundamentally eliminating maintenance safety hazards, and especially avoiding the situation where the main shaft 3 of the circuit breaker is energized and affects the control cavity.

[0034] In some embodiments, a pressure cap 545 is provided at the end of the sliding sleeve 544 away from the auxiliary moving contact 541. The pressure cap 545 has a through hole at its center that matches the auxiliary shaft 542, ensuring smooth sliding of the auxiliary shaft 542. A first spring 546 is provided between the pressure cap 545 and the base 540. The first spring 546 is a cylindrical helical compression spring. When the coil assembly 543 is energized and generates a magnetic field to drive the sliding sleeve 544 to move, the pressure cap 545 moves synchronously and compresses the first spring 546, storing elastic potential energy. When the coil assembly 543 is de-energized, under the action of the elastic potential energy of the first spring 546, the pressure cap 545 drives the sliding sleeve 544 to move in the opposite direction, causing the auxiliary moving contact 541 to separate from the auxiliary stationary contact 550. This separation can be maintained even when the coil assembly 543 is not energized, which not only reduces energy consumption but also ensures the reliability of the separation between the auxiliary moving contact 541 and the auxiliary stationary contact 550.

[0035] Furthermore, a first magnetic attractor 547 is fixedly disposed at one end of the sliding sleeve 544 near the auxiliary moving contact 541. The first magnetic attractor 547 has a ring structure. A second magnetic attractor 548 is fixedly disposed on the base 540 along the moving path of the first magnetic attractor 547. The second magnetic attractor 548 has a ring structure and a diameter consistent with the first magnetic attractor 547. For example, both the first magnetic attractor 547 and the second magnetic attractor 548 are neodymium iron boron permanent magnets, and their opposite end faces have opposite polarities, so that the attraction force can overcome the restoring force of the corresponding spring. The first magnetic attractor 547 and the second magnetic attractor 548 form a magnetic connection, so that the auxiliary moving contact 541 and the auxiliary stationary contact 550 remain closed when the coil assembly 543 is de-energized. In this way, the coil assembly 543 does not need to be continuously powered, reducing energy consumption while improving closing stability.

[0036] In some embodiments, a second spring 549 is provided between the secondary shaft 542 and the pressure cover 545. The second spring 549 is also a cylindrical helical compression spring, made of the same material as the first spring 546. The second spring 549 is compressed synchronously with the first spring 546 by the pressure cover 545, and the compression amount is greater than that of the first spring 546. The second spring 549 can provide auxiliary elastic force. During opening, its elastic potential energy works synergistically with the first spring 546 to further increase the opening speed, ensure that the secondary contacts disconnect quickly, avoid arcing, and solve the problem of insufficient breaking force of a single spring in the initial stage of opening.

[0037] In some embodiments, a coil assembly power supply circuit is also included, which includes a power supply, a controller, and a linkage switch disposed on the main shaft 3 of the circuit breaker. The power supply can provide a stable driving power for the coil assembly 543; the controller can control the on / off state and current direction of the coil assembly 543 according to the line status, thereby realizing the switching of positive and negative magnetic fields. The linkage switch includes a rotating disk 80, a moving contact 81, a stationary contact 82, a moving end wire 83, and a stationary end wire 84 that rotate synchronously with the main shaft 3 of the circuit breaker. The rotating disk 80 is fixedly connected to the main shaft 3 of the circuit breaker, and its outer peripheral wall forms a linkage surface. The linkage surface includes a closed portion 85 and a recessed portion 86. The closed portion 85 is the outer peripheral cylindrical surface of the rotating disk 80, and the recessed portion 86 is an arc-shaped surface that is concave along the radial direction of the rotating disk 80. One end of the moving contact 81 is connected to the moving end wire 83, and the other end abuts against the linkage surface; one end of the stationary contact 82 is connected to the stationary end wire 84, and the other end is spaced apart from the moving contact 81. Both the moving end wire 83 and the stationary end wire 84 are connected between the controller and the coil assembly 543. The power supply is connected to the controller to supply power to the coil assembly 543. When the closing part 85 abuts against the moving contact 81, the moving contact 81 and the stationary contact 82 are connected, and the active contact 51 and the main stationary contact 52 are in the open state. When the recessed part 86 abuts against the moving contact 81, the moving contact 81 and the stationary contact 82 are disconnected, and the active contact 51 and the main stationary contact 52 are in the closed state. The timing of power supply to the coil assembly 543 is strictly limited by mechanical interlocking, completely preventing the auxiliary moving contact 541 and the auxiliary stationary contact 550 from disconnecting first, thus ensuring the safety of the solid-sealed pole 5. It is understandable that electrical interlocks will also be set in the control circuit to prevent the auxiliary moving contact 541 and the auxiliary stationary contact 550 from disconnecting first. That is, the auxiliary moving contact 541 and the auxiliary stationary contact 550 can only open or close when the circuit breaker main shaft 3 is in the open state.

[0038] In some embodiments, the flexible conductive element 56 is connected to a conductive plate and to a grounding contact 70 via the conductive plate. The conductive plate is fastened to the flexible conductive element 56 and the grounding contact 70 respectively by bolts. The flexible conductive element 56 includes multiple layers of stacked conductive sheets. The conductive sheets are made of oxygen-free copper foil with a thickness of 0.1-0.2 mm. Each layer of the conductive sheets has a spiral opening 560. This structure, while ensuring the conductive cross-sectional area, significantly improves the mechanical flexibility of the flexible conductive element 56, with a large bending radius and long fatigue life. It can fully adapt to the frequent reciprocating movement of the moving conductive rod 55 and avoid the defects of fatigue fracture in traditional copper strip structures.

[0039] Optionally, both the active contact 51 and the main stationary contact 52 are provided with a first isolation cover 91. The first isolation cover 91 is made of polytetrafluoroethylene and has a cup-shaped structure. It is fitted onto the outside of the contact and can effectively isolate the electric arc generated during closing, prevent metal vapor from splashing and contaminating the inner wall of the insulating shell 50, and avoid the formation of a conductive channel that could lead to insulation breakdown.

[0040] Furthermore, a second isolation cover 92 is provided on the moving conductive rod 55 between the insulating pull rod 54 and the flexible conductive element 56. The second isolation cover 92 is made of polytetrafluoroethylene and has a cup-shaped structure, which can provide insulation protection for the moving conductive rod 55.

[0041] In some embodiments, the solidified pole post 5 is laterally arranged within the frame 1. The disconnecting switch 6 includes an inlet insulating arm 60, a disconnecting knife 61, a disconnecting rod 62, and a disconnecting swing block 63. The disconnecting swing block 63 is disposed on the disconnecting main shaft 2 and is connected to the disconnecting knife 61 via the disconnecting rod 62. The disconnecting swing block 63 is fixed to the disconnecting main shaft 2. The disconnecting rod 62 is made of glass fiber reinforced epoxy resin. An disconnecting contact seat 64 is provided on the solidified pole post 5 at one end near the main stationary contact 52. The disconnecting contact seat 64 is laterally spaced from the disconnecting main shaft 2. The disconnecting knife 61 is hinged to the disconnecting contact seat 64. The inlet insulating arm 60 is made of epoxy resin and is disposed above the solidified pole post 5. An inlet wiring plate 65 and an inlet contact seat 66 are disposed on it. The inlet wiring plate 65 is used to connect the external inlet cable. The inlet contact seat 66 cooperates with the disconnecting knife 61 to achieve line isolation. The grounding switch 7 includes a grounding knife switch 71 mounted on the grounding main shaft 4, which is fixed to the grounding main shaft 4. The grounding contact seat 70 and the grounding main shaft 4 are arranged laterally at intervals. When the grounding main shaft 4 rotates, it causes the grounding knife switch 71 to contact or separate from the grounding contact seat 70, thereby achieving line grounding or grounding release. This arrangement results in a reasonable spatial layout and full utilization of space.

[0042] In summary, after reading this detailed disclosure, those skilled in the art will understand that the foregoing detailed disclosure is presented by way of example only and is not restrictive. Although not explicitly stated herein, those skilled in the art will understand that the requirements of this application encompass various reasonable changes, improvements, and modifications to the embodiments. These changes, improvements, and modifications are intended to be made by this application and are within the spirit and scope of the exemplary embodiments of this application.

[0043] Furthermore, it should be understood that in the foregoing description of the embodiments of this application, various features are combined in a single embodiment, drawing, or description for the purpose of simplifying the understanding of a feature. However, this does not mean that the combination of these features is necessary, and those skilled in the art may readily identify some of the devices as separate embodiments when reading this application. That is, the embodiments in this application can also be understood as an integration of multiple sub-embodiments. It is also valid when each sub-embodiment contains fewer than all the features of a single foregoing disclosed embodiment.

[0044] Finally, it should be understood that the embodiments disclosed herein are illustrative of the principles of the embodiments of this application. Other modified embodiments are also within the scope of this application. Therefore, the embodiments disclosed herein are merely examples and not limitations. Those skilled in the art can adopt alternative configurations to implement the applications in this application based on the embodiments in this application. Therefore, the embodiments of this application are not limited to the embodiments precisely described in the application.

Claims

1. A primary and secondary integrated pole-mounted circuit breaker, comprising a frame, the frame including an electrical cavity and a control cavity, wherein the electrical cavity is provided with an isolation spindle, a circuit breaker spindle, a grounding spindle, and three sets of parallel-arranged switch assemblies, each switch assembly including a solid-sealed pole, a disconnecting switch, and a grounding switch, characterized in that, The solid-sealed pole includes an insulating shell, an active contact, a main stationary contact, a connecting rod, an insulating pull rod, and a moving conductive rod. A swing arm is mounted on the main shaft of the circuit breaker. The swing arm, connecting rod, insulating pull rod, and moving conductive rod are sequentially connected to the active contact. A grounding contact seat is connected to the moving conductive rod via a flexible conductive element. A base, an auxiliary active contact, a secondary shaft, and a coil assembly are housed within the insulating pull rod. One end of the secondary shaft is connected to the auxiliary active contact, and the other end is fitted with a sliding sleeve. The outer ring of the sliding sleeve is fitted with a coil assembly. The moving conductive rod is slidably arranged along the axial direction of the base. One end of the moving conductive rod extends into the insulating pull rod, and a corresponding auxiliary stationary contact is provided for the auxiliary moving contact. Before the active contact and the main stationary contact are closed, the coil assembly is energized to generate a magnetic field that drives the sliding sleeve to move. The sliding sleeve drives the secondary shaft to move, so that the auxiliary moving contact and the auxiliary stationary contact are closed in advance. Only after the active contact and the main stationary contact are opened can the coil assembly be energized to generate a reverse magnetic field that drives the sliding sleeve to move. The sliding sleeve drives the secondary shaft to move, so that the auxiliary moving contact and the auxiliary stationary contact are opened.

2. The primary and secondary integrated pole-mounted circuit breaker according to claim 1, characterized in that, A pressure cap is provided at the end of the sliding sleeve away from the auxiliary moving contact. A first spring is provided between the pressure cap and the base. When the coil assembly is energized and generates a magnetic field to drive the sliding sleeve to move, the pressure cap moves synchronously and compresses the first spring. When the coil assembly is de-energized, the auxiliary moving contact and the auxiliary stationary contact are disconnected under the action of the first spring.

3. A primary and secondary integrated pole-mounted circuit breaker according to claim 1 or 2, characterized in that, A first magnetic attractor is provided at one end of the sliding sleeve near the auxiliary moving contact, and a second magnetic attractor is provided on the base along the moving path of the first magnetic attractor. The first and second magnetic attractors form a magnetic attraction connection, so that the auxiliary moving contact and the auxiliary stationary contact remain closed when the coil assembly is de-energized.

4. A primary and secondary integrated pole-mounted circuit breaker according to claim 2, characterized in that, A second spring is provided between the sub-shaft and the pressure cap. The second spring is compressed synchronously with the first spring by the pressure cap, and the compression amount is greater than that of the first spring.

5. A primary and secondary integrated pole-mounted circuit breaker according to claim 1, characterized in that, It also includes a coil assembly power supply circuit, which includes a power supply, a controller, and a linkage switch mounted on the main shaft of the circuit breaker. The linkage switch includes a rotating disk that rotates synchronously with the main shaft of the circuit breaker, a moving contact, a stationary contact, a moving end wire, and a stationary end wire. The outer peripheral wall of the rotating disk forms a linkage surface, which includes a closed portion and a recessed portion. One end of the moving contact is connected to the moving end wire, and the other end abuts against the linkage surface. One end of the stationary contact is connected to the stationary end wire, and the other end is spaced apart from the moving contact. The moving end wire and the stationary end wire are connected between the controller and the coil assembly. The power supply is connected to the controller to supply power to the coil assembly. When the closed portion abuts against the moving contact, the moving contact and the stationary contact are connected, and the active contact and the main stationary contact are in the open state. When the recessed portion abuts against the moving contact, the moving contact and the stationary contact are disconnected, and the active contact and the main stationary contact are in the closed state.

6. A primary and secondary integrated pole-mounted circuit breaker according to claim 1, characterized in that, The flexible conductive element is connected to a conductive plate and is connected to a grounding contact via the conductive plate. The flexible conductive element includes several stacked conductive sheets, and the conductive sheets have spiral openings.

7. A primary and secondary integrated pole-mounted circuit breaker according to claim 1, characterized in that, Both the active contact and the main stationary contact are provided with a first isolation cover.

8. A primary and secondary integrated pole-mounted circuit breaker according to claim 1, characterized in that, A second isolation cover is provided on the moving conductive rod between the insulating pull rod and the flexible conductive component.

9. A primary and secondary integrated pole-mounted circuit breaker according to claim 6, characterized in that, The solid-sealed pole is horizontally arranged inside the frame. The disconnecting switch includes an inlet insulating arm, a disconnecting knife, a disconnecting rod, and a disconnecting swing block. The disconnecting swing block is arranged on the disconnecting main shaft and is connected to the disconnecting knife through the disconnecting rod. An disconnecting contact seat is provided on the solid-sealed pole at one end near the main stationary contact. The disconnecting contact seat is horizontally spaced from the disconnecting main shaft. The disconnecting knife is hinged to the disconnecting contact seat. The inlet insulating arm is arranged above the solid-sealed pole and has an inlet terminal block and an inlet contact seat on it.

10. A primary and secondary integrated pole-mounted circuit breaker according to claim 9, characterized in that, The grounding switch includes a grounding knife block disposed on the grounding main shaft, and the grounding contact and the grounding main shaft are arranged laterally at intervals.

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