Three-position disconnector with load switching function

Abstract

The application discloses a three-position isolating switch with load switching function, which comprises a rack, three groups of isolating switches arranged in a straight line and spaced apart from each other in the rack, an outgoing line seat, a isolating knife fork rod rotatably connected to the outgoing line seat, an operating mechanism arranged on one side of the rack, an operating shaft of the operating mechanism, a line contact and a grounding contact corresponding to the isolating knife fork rod of each group of isolating switches arranged on the rack, and a vacuum arc-extinguishing chamber assembly used for the line contact and the grounding contact. An outer end of a movable contact of the vacuum arc-extinguishing chamber assembly is provided with a contact plate matched with the isolating knife fork rod. When the operating shaft drives the isolating knife fork rod to rotate to a closed state, a movable end of the isolating knife fork rod is connected with the contact plate of the line contact. When the isolating knife fork rod rotates to a grounding state, the movable end of the isolating knife fork rod is connected with the contact plate of the grounding contact. The application has the ability of load switching.

Description

Technical Field

[0001] This invention relates to the field of disconnecting switch technology, specifically a three-position disconnecting switch with load opening and closing functions. Background Technology

[0002] Currently, all environmentally friendly gas filling cabinets in power systems both domestically and internationally are equipped with disconnecting switches. The structure of a disconnecting switch mainly includes an isolating knife switch and a stationary contact. The isolating knife switch is connected to an operating shaft, which rotates the isolating knife switch to engage or disengage with the stationary contact. Most existing disconnecting switches use copper contact plates that directly contact the isolating knife switch. If the switch is opened or closed under load, a strong electric arc will be generated, causing harm to equipment and personnel. Therefore, conventional three-position disconnecting switches cannot be used for opening or closing under load. They are only used during equipment maintenance to isolate energized and de-energized parts, isolating the equipment under maintenance from the power system to ensure the safety of personnel and equipment. Load switches or circuit breakers must be installed in the equipment. The disconnecting switch can only be operated after the load switch or circuit breaker has been opened. If the disconnecting switch is operated without disconnecting the load switch or circuit breaker, an accident will occur. Summary of the Invention

[0003] The main objective of this invention is to solve the problems existing in the prior art and provide a three-position disconnecting switch with load opening and closing function, so that the disconnecting switch can also have the function of load opening and closing.

[0004] The specific solution of this invention is as follows: a three-position disconnecting switch with load opening and closing function, including a frame, with three sets of disconnecting switches inside the frame, the three sets of disconnecting switches corresponding to phase A, phase B, and phase C respectively, the three sets of disconnecting switches are arranged in a straight line and spaced a certain distance from each other, each set of disconnecting switches includes an outgoing terminal, on which an isolating fork lever is rotatably connected, an operating mechanism is provided on one side of the frame, the operating mechanism has an operating shaft, the operating shaft is connected to all isolating fork levers through a transmission mechanism, the isolating fork levers on the frame corresponding to each set of disconnecting switches are provided with an incoming contact and a grounding contact, the incoming contact and the grounding contact are both made of vacuum interrupter assembly, the moving contact of the vacuum interrupter assembly has a contact plate matching the isolating fork lever at its outer end, when the operating shaft drives the isolating fork lever to rotate to the closing state, the moving end of the isolating fork lever is connected to the contact plate of the incoming contact, when the isolating fork lever rotates to the grounding state, the moving end of the isolating fork lever is connected to the contact plate of the grounding contact.

[0005] Furthermore, the moving contact of the vacuum interrupter assembly is provided with a T-shaped block at its outer end. The protruding part in the middle of the T-shaped block is the contact plate. An arc-shaped spring is installed on each side of the contact plate. When the isolation fork rod is connected to the contact plate, the end face of the isolation fork rod presses against the arc-shaped spring, thereby making the inner end of the moving contact in close contact with the stationary contact.

[0006] Furthermore, the isolation knife and fork lever is composed of two isolation blades with a certain distance between them. The movable ends of the two isolation blades are provided with protrusions on opposite sides, and the edges of the protrusions are provided with smooth arc transitions. When the isolation knife and fork lever is connected to the touch plate, the protrusions on both sides are in close contact with the touch plate.

[0007] Furthermore, the vacuum interrupter assembly includes an insulating shell, inside which a vacuum interrupter is provided. Inside the vacuum interrupter are a moving contact and a stationary contact. One end of the stationary contact extends outward from the insulating shell and is fixed. The outer end of the moving contact is provided with a limiting pin. The side wall of the insulating shell is provided with a guide hole at each end corresponding to the two ends of the limiting pin. The inner end of the moving contact is equipped with a return spring.

[0008] Furthermore, an insulating partition is provided between each pair of adjacent disconnect switches within the frame, and an insulating partition is also provided between the disconnect switch and the frame. Each insulating partition has a through hole corresponding to the operating shaft.

[0009] Compared with the prior art, the present invention has the following advantages: it uses a vacuum arc-extinguishing chamber to replace the traditional copper contact plate, which extinguishes the arc during opening and closing, can quickly extinguish the arc and suppress the current, thus having the ability to open and close under load. When the actual power load is less than the load capacity of this disconnecting switch, it can be directly used to replace the load switch, reducing equipment costs. Attached Figure Description

[0010] Figure 1 This is a front view of the structure of the present invention; Figure 2 yes Figure 1 AA view; Figure 3 This is a schematic diagram of the closed state of the present invention; Figure 4 This is a schematic diagram of the grounding state of the present invention; Figure 5 This is a schematic diagram of the vacuum interrupter assembly in the open state of the present invention; Figure 6 This is a schematic diagram of the vacuum interrupter assembly in the closed state of the present invention; Figure 7 yes Figure 1 A magnified view at point V; In the diagram: 1. Frame; 2. Operating shaft; 3. Insulating partition; 4. Isolating fork lever; 41. Protrusion; 5. Vacuum interrupter; 6. Operating mechanism; 7. Outlet socket; 8. Transmission mechanism; 51. Insulating shell; 52. Moving contact; 53. Return spring; 54. T-block; 55. Arc-shaped spring; 56. Limit pin; 57. Contact plate; 58. Stationary contact. Detailed Implementation

[0011] See Figure 1-7 This embodiment is a three-position disconnecting switch with load-bearing opening and closing function, including a frame 1. The frame 1 contains three sets of disconnecting switches, corresponding to phases A, B, and C respectively. The three sets of disconnecting switches are arranged in a straight line and spaced a certain distance apart. Each set of disconnecting switches includes a terminal block 7, on which a disconnecting fork lever 4 is rotatably connected. An operating mechanism 6 is provided on one side of the frame 1. The operating mechanism 6 has an operating shaft 2, which is connected to all the disconnecting fork levers 4 via a transmission mechanism 8. The frame 1 has an isolation fork lever 4 corresponding to each group of disconnecting switches, which is equipped with an incoming line contact and a grounding contact. Both the incoming line contact and the grounding contact adopt a vacuum interrupter 5 assembly. The moving contact 52 of the vacuum interrupter 5 assembly is equipped with a contact plate 57 that matches the isolation fork lever 4. When the operating shaft 2 drives the isolation fork lever 4 to rotate to the closed state, the moving end of the isolation fork lever 4 is connected to the contact plate 57 of the incoming line contact. When the isolation fork lever 4 rotates to the grounding state, the moving end of the isolation fork lever 4 is connected to the contact plate 57 of the grounding contact.

[0012] Furthermore, the moving contact 52 of the vacuum interrupter 5 assembly is provided with a T-shaped block 54 at its outer end. The middle protrusion 41 of the T-shaped block 54 is the contact plate 57. An arc-shaped spring piece 55 is installed on each side of the contact plate 57. When the isolation fork rod 4 is connected to the contact plate 57, the end face of the isolation fork rod 4 presses against the arc-shaped spring piece 55, thereby making the inner end of the moving contact 52 in close contact with the stationary contact 58.

[0013] Furthermore, the isolation knife and fork lever 4 is composed of two isolation blades with a certain distance between them. The movable ends of the two isolation blades are provided with protrusions 41 on opposite sides. The edges of the protrusions 41 are provided with smooth arc transitions. When the isolation knife and fork lever 4 is connected to the contact plate 57, the protrusions 41 on both sides are in close contact with the contact plate 57.

[0014] The function of the arc-shaped spring piece 55 in this invention is as follows: When the isolating knife fork rod 4 rotates to contact the moving contact 52 of the vacuum interrupter 5, the inner sides of the two isolating blades first contact the two sides of the contact plate 57 of the T-shaped block 54, and at the same time, the end face of the isolating blades contacts the outer surface of the arc-shaped spring piece 55; as the isolating knife fork rod 4 continues to rotate to its position, the isolating knife fork rod 4 pushes or presses the moving contact 52 of the vacuum interrupter 5 inward, so that the moving contact 52 in the vacuum interrupter 5 contacts the stationary contact 58 to achieve arc extinguishing. At this time, the arc-shaped spring piece 55 is squeezed and deformed by the knife fork rod to generate a large elastic force. This elastic force further applies a squeezing force to the moving contact 52, thereby ensuring that the moving contact 52 and the stationary contact 58 are in close contact and ensuring reliable arc extinguishing performance.

[0015] Furthermore, the vacuum interrupter 5 assembly includes an insulating shell 51, inside which a vacuum interrupter 5 is provided. Inside the vacuum interrupter 5, a moving contact 52 and a stationary contact 58 are provided. One end of the stationary contact 58 extends outward from the insulating shell 51 and is fixed. The outer end of the moving contact 52 is provided with a limiting pin 56. The side wall of the insulating shell 51 is provided with a guide hole at each end corresponding to the limiting pin 56. The inner end of the moving contact 52 is equipped with a return spring 53. The limiting pin 56 and the guide hole ensure that the moving contact 52 moves in a straight line.

[0016] Furthermore, an insulating partition 3 is provided in the frame 1 between each pair of adjacent disconnecting switches, and an insulating partition 3 is also provided between the disconnecting switch and the frame 1. Each insulating partition 3 has a through hole corresponding to the operating shaft 2.

[0017] In this embodiment, when the disconnecting switch is opened, closed, or grounded, a vacuum interrupter is used. The vacuum interrupter can quickly and effectively extinguish the arc, ensuring the stability and safety of the switch. Therefore, it is possible to open and close the switch under a certain load.

Claims

1. A three-position disconnecting switch with load-bearing opening and closing function, comprising a frame, wherein three sets of disconnecting switches are provided within the frame, the three sets of disconnecting switches corresponding to phase A, phase B, and phase C respectively, the three sets of disconnecting switches are arranged in a straight line and spaced apart from each other at a certain distance, each set of disconnecting switches includes a terminal block, on which a disconnecting fork lever is rotatably connected, and an operating mechanism is provided on one side of the frame, the operating mechanism having an operating shaft, the operating shaft being connected to all disconnecting fork levers through a transmission mechanism, characterized in that: The frame has an inlet contact and a ground contact for each set of disconnecting switches. Both the inlet contact and the ground contact are vacuum interrupter assemblies. The moving contact of the vacuum interrupter assembly has a contact plate that matches the disconnecting fork. When the operating shaft drives the disconnecting fork to rotate to the closed state, the moving end of the disconnecting fork is connected to the contact plate of the inlet contact. When the disconnecting fork rotates to the grounded state, the moving end of the disconnecting fork is connected to the contact plate of the ground contact. The moving contact of the vacuum interrupter assembly is provided with a T-shaped block at the outer end. The protruding part in the middle of the T-shaped block is the contact plate. An arc-shaped spring is installed on each side of the contact plate. When the isolation fork rod is connected to the contact plate, the end face of the isolation fork rod presses the arc-shaped spring, thereby making the inner end of the moving contact in close contact with the stationary contact. The isolation knife and fork lever consists of two isolation blades with a certain distance between them. The movable ends of the two isolation blades are provided with protrusions on opposite sides, and the edges of the protrusions are provided with smooth arc transitions. When the isolation knife and fork lever is connected to the touch plate, the protrusions on both sides are in close contact with the touch plate. The vacuum interrupter assembly includes an insulating shell, a vacuum interrupter is provided inside the insulating shell, a moving contact and a stationary contact are provided inside the vacuum interrupter, one end of the stationary contact extends outward from the insulating shell and is fixed, a limiting pin is provided at the outer end of the moving contact, a guide hole is provided at each end of the side wall of the insulating shell corresponding to the two ends of the limiting pin, and a return spring is installed at the inner end of the moving contact. An insulating partition is provided between each pair of adjacent disconnecting switches within the frame, and an insulating partition is also provided between the disconnecting switch and the frame. Each insulating partition has a through hole corresponding to the operating shaft.

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