40. Eccentric rotating double-break three-position disconnector for 40.5 kV gas-insulated switchgear

Abstract

This utility model relates to the field of switch structures, and particularly to an eccentric rotary double-break three-position disconnecting switch for 40.5kV gas-insulated switchgear. The switch includes an isolating stationary contact, a circuit breaker stationary contact, a grounding stationary contact, and a disconnecting switch. The disconnecting switch includes a three-position switch conductor, an insulating support structure, and a rotating shaft. The insulating support structure is fixedly connected to the three-position switch conductor. The rotating shaft is sleeved with the insulating support structure, allowing the three-position switch conductor to rotate around the center of the shaft. The isolating stationary contact, circuit breaker stationary contact, and grounding stationary contact are spatially arranged in a triangle, with the rotating shaft located at the circumcenter of this triangle, forming an eccentric structure. By spatially distributing the isolating stationary contact, circuit breaker stationary contact, and grounding stationary contact in a triangular pattern, and with the rotating shaft located at the circumcenter of the triangle to form an eccentric structure, the conductor rotation path is significantly shortened, resulting in a more compact overall layout, suitable for electrical cabinets with limited space.

Description

Technical Field

[0001] This utility model relates to the field of switch structure, and in particular to an eccentric rotary double-break three-position disconnect switch for a 40.5kV gas-insulated switchgear. Background Technology

[0002] In medium- and high-voltage power systems, 40.5kV metal-enclosed switchgear is the core equipment for realizing power distribution and control. Disconnect switches and grounding switches, as key functional components of this equipment, undertake important tasks such as circuit isolation, grounding protection, and switching operations. After the circuit breaker completes the short-circuit current interruption, the disconnect switch must perform an opening operation to establish an electrical isolation break. Subsequently, the grounding switch closes to ground the main circuit, creating safe conditions for equipment maintenance or system operation mode switching.

[0003] To simplify equipment structure and improve operational efficiency, the "isolation-grounding three-position switch," which integrates the functions of connection, isolation, and grounding, has emerged. This type of switch achieves switching between three working positions through a single operating mechanism, featuring three states: connection (conductive circuit connected), isolation (insulation gap formed between contacts), and grounding (main circuit connected to the grounding system). This significantly reduces the number of components and space occupied by the switchgear.

[0004] Currently, the three-position switches used in 40.5kV gas-insulated switchgear (GIS) mainly adopt two technical solutions. One is the direct-acting three-position switch, which forms an isolation break through a linear movement perpendicular to the conductive circuit, and the grounding function is achieved through the mechanical linkage between an independent grounding contact and the main circuit. The second is the rotary knife switch type single-break three-position switch, which uses a rotary pivot to drive the knife switch to rotate, and achieves function switching through the opening and closing of a single-break contact.

[0005] Both of the commonly used solutions mentioned above suffer from the problem of excessively large switch size and material consumption, which indirectly leads to an excessively large size of the switching equipment, hindering the miniaturization of the switching equipment and increasing manufacturing costs.

[0006] To address the aforementioned issues, how to provide a three-position disconnect switch that, while ensuring high-voltage insulation performance, significantly reduces the size of the switch body, lowers material consumption, and achieves miniaturization of 40.5kV gas-insulated switchgear is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0007] To overcome the shortcomings of existing technologies, this utility model provides an eccentric rotary double-break three-position disconnecting switch for 40.5kV gas-insulated switchgear.

[0008] It includes isolating stationary contacts, circuit breaker stationary contacts, grounding stationary contacts, and disconnecting switches; the disconnecting switch includes a three-position switch conductor, an insulating support structure, and a rotating shaft;

[0009] The insulating support structure is fixedly connected to the conductor of the three-position switch.

[0010] The rotating shaft is sleeved with the insulating support structure, so that the three-position switch conductor rotates around the center of the rotating shaft;

[0011] The isolating stationary contact, the circuit breaker stationary contact, and the grounding stationary contact are spatially distributed in a triangle, and the rotating shaft is located at the outer center of the triangle, forming an eccentric structure.

[0012] The three-position switch conductor is rotated to switch between the isolating stationary contact, the circuit breaker stationary contact, and the grounding stationary contact, for connecting or disconnecting the isolating stationary contact, the circuit breaker stationary contact, and the grounding stationary contact.

[0013] Based on the above scheme, it further includes a cabinet, which is equipped with busbars, circuit breakers and grounding bars;

[0014] The isolating stationary contact is fixedly installed on the busbar; the circuit breaker stationary contact is installed on the circuit breaker; and the grounding stationary contact is fixedly installed on the grounding busbar.

[0015] Based on the above scheme, the installation positions of the isolating stationary contact and the circuit breaker stationary contact are symmetrically distributed relative to the grounding stationary contact.

[0016] Based on the above scheme, the three-position switch conductor is further composed of two symmetrically distributed bent segments directly connected together. The two bent segments are directly connected at their center of symmetry, and each bent segment is inclined upward or downward relative to each other, forming a conductive path with bends.

[0017] Furthermore, based on the above scheme, the included angle formed between the two bending segments can be adjusted.

[0018] Based on the above scheme, further, the rotating shaft is a hexagonal insulated shaft, and the insulating support structure has a hexagonal hole inside, which matches the hexagonal cross section of the rotating shaft.

[0019] Based on the above scheme, the three-position switch conductor is further fixedly connected to the insulating support structure by screws.

[0020] Furthermore, based on the above scheme, the material of the conductor of the three-position switch is a conductive material.

[0021] Furthermore, based on the above scheme, the conductive material is copper or a copper alloy.

[0022] Furthermore, based on the above scheme, the insulating support structure is made of plastic or nylon.

[0023] Preferably, the insulating support structure and the rotating shaft are provided with an anti-loosening buckle structure.

[0024] Compared with existing technologies, the three-position disconnect switch provided by this utility model significantly shortens the conductor rotation path by spatially distributing the isolation stationary contact, circuit breaker stationary contact, and grounding stationary contact in a triangular pattern, with the rotating shaft located at the outer center of the triangle to form an eccentric structure. This results in a more compact overall layout, reduced equipment size, and suitability for space-constrained electrical cabinets. Furthermore, the combination of the conductor rotation switching mechanism and the eccentric rotating shaft design ensures precise matching between the conductor's movement trajectory and the contact position, reducing mechanical friction and jamming risks during switching, improving opening and closing speed and operational consistency, and enhancing system reliability. The rapid switching between isolation, circuit breaking, and grounding positions can be achieved through the rotation of a single conductor, avoiding coordination errors caused by independent operation of multiple components. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the three-position disconnect switch connection position provided by this utility model;

[0027] Figure 2 This is a schematic diagram of the disconnected position of the three-position isolating switch provided by this utility model;

[0028] Figure 3 A schematic diagram of the grounding position of the three-position disconnect switch provided by this utility model;

[0029] Figure 4 A schematic diagram of the disconnector structure provided by this utility model.

[0030] Figure label:

[0031] 10-Cabinet; 11-Busbar; 12-Circuit breaker; 13-Grounding busbar; 14-Isolating stationary contact; 15-Circuit breaker stationary contact; 16-Grounding stationary contact;

[0032] 20-Disconnecting switch; 21-Three-position switch conductor; 22-Insulating support structure; 23-Rotating shaft;

[0033] 24 - Bend section; 25 - Screw. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] To address the problem that existing technologies often result in large switch sizes and excessive material usage, which indirectly leads to larger switchgear sizes and hinders miniaturization, this invention provides an eccentric rotary double-break three-position disconnecting switch for 40.5kV gas-insulated switchgear.

[0037] like Figure 1-4 As shown, the scheme includes an isolating stationary contact 14, a circuit breaker stationary contact 15, a grounding stationary contact 16, and a disconnecting switch 20; the disconnecting switch 20 includes a three-position switch conductor 21, an insulating support structure 22, and a rotating shaft 23;

[0038] The insulating support structure 22 is fixedly connected to the three-position switch conductor 21;

[0039] The rotating shaft 23 is sleeved with the insulating support structure 22, so that the three-position switch conductor 21 rotates around the center of the rotating shaft 23;

[0040] The isolating stationary contact 14, the circuit breaker stationary contact 15, and the grounding stationary contact 16 are arranged in a triangle in space, and the rotating shaft 23 is located at the outer center of the triangle, forming an eccentric structure.

[0041] The three-position switch conductor 21 is rotated to switch to the isolating stationary contact 14, the circuit breaker stationary contact 15, and the grounding stationary contact 16, for connecting or disconnecting the isolating stationary contact 14, the circuit breaker stationary contact 15, and the grounding stationary contact 16.

[0042] Specifically, in use, such as Figure 1 As shown, this is the ON state of the three-position disconnector switch. At this time, the conductor 21 of the three-position switch connects the isolating stationary contact 14 and the circuit breaker stationary contact 15. The disconnector switch 20 is closed, meaning the main circuit of the switchgear is closed. Figure 2 As shown, this is the open position of the three-position disconnector. In this position, the conductor 21 of the three-position disconnector is disconnected from both the isolating stationary contact 14 and the circuit breaker stationary contact 15. The disconnector 20 is open, meaning the main circuit is disconnected. This creates two open positions, forming what is known as a "double break." Figure 3 As shown, this is the grounding position of the three-position disconnector. At this time, the conductor 21 of the three-position switch connects the circuit breaker stationary contact 15 with the grounding stationary contact 16, and the grounding switch is closed, thus grounding the main circuit.

[0043] like Figure 1-3 As shown, the three-position disconnect switch rotates via shaft 23, from Figure 1 Exercise Figure 2 Location, then from Figure 2 Exercise Figure 3 Position, that is, "rotational".

[0044] In one embodiment, such as Figure 1-3 As shown, it also includes a cabinet 10, on which a busbar 11, a circuit breaker 12 and a grounding busbar 13 are provided;

[0045] The isolating stationary contact 14 is fixedly installed on the busbar 11; the circuit breaker stationary contact 15 is installed on the circuit breaker 12; and the grounding stationary contact 16 is fixedly installed on the grounding busbar 13.

[0046] By adopting the above scheme, the isolation stationary contact 14, the circuit breaker stationary contact 15 and the grounding stationary contact 16 are fixedly installed on the busbar 11, the circuit breaker 12 and the grounding bar 13 respectively, thus realizing the integrated layout of the internal components of the cabinet 10 of the three-position disconnect switch. This simplifies the structural design, reduces the installation complexity, and ensures the reliability of the electrical connection between each contact, which is conducive to the overall miniaturization of the equipment.

[0047] In one embodiment, such as Figure 1 As shown, the installation positions of the isolating stationary contact 14 and the circuit breaker stationary contact 15 are symmetrically distributed relative to the grounding stationary contact 16.

[0048] By adopting the above scheme, the isolating stationary contact 14 and the circuit breaker stationary contact 15 are symmetrically distributed relative to the grounding stationary contact 16, which helps to balance mechanical stress and enhance the stability and lifespan of the switch operation.

[0049] In one embodiment, such as Figure 4 As shown, the three-position switch conductor 21 is composed of two symmetrically distributed bent segments 24 directly connected. The two bent segments 24 are directly connected at their center of symmetry, and each bent segment 24 is inclined upward or downward relative to each other, forming a conductive path with bends.

[0050] By adopting the above scheme, the bending design can be adapted to the triangular stationary contact layout, shortening the conductive path length; at the same time, the symmetrical bending structure enhances the mechanical strength of the conductor and avoids deformation caused by vibration or impact.

[0051] In one embodiment, the included angle formed between the two bent segments 24 is adjustable.

[0052] Specifically, the included angle between the two bending segments 24 is adjustable, allowing the conductor to flexibly adapt to cabinets 10 of different sizes or layouts, thus improving the versatility of the design.

[0053] In one embodiment, such as Figure 4 As shown, the rotating shaft 23 is a hexagonal insulated shaft, and the insulating support structure 22 has a hexagonal hole inside, which matches the hexagonal cross section of the rotating shaft 23.

[0054] By adopting the above scheme, the hexagonal insulated shaft and the hexagonal hole of the insulated support structure 22 are matched to provide precise torque transmission, avoid relative sliding between the rotating shaft 23 and the support, and facilitate installation and positioning.

[0055] In one embodiment, such as Figure 4 As shown, the three-position switch conductor 21 is fixedly connected to the insulating support structure 22 by screws 25.

[0056] In one embodiment, the conductor 21 of the three-position switch is made of a conductive material.

[0057] In one embodiment, the conductive material is copper or a copper alloy.

[0058] In one embodiment, the insulating support structure 22 is made of plastic or nylon.

[0059] Specifically, plastic or nylon materials are used because they have excellent insulation properties and lightweight characteristics, effectively isolating live parts and improving equipment safety; at the same time, the materials are low in cost and easy to process and mold, making them suitable for mass production.

[0060] In one embodiment, an anti-loosening snap-fit ​​structure is provided between the insulating support structure 22 and the rotating shaft 23.

[0061] Specifically, the anti-loosening snap-fit ​​structure between the insulating support structure 22 and the rotating shaft 23 can prevent the rotating shaft 23 from axial displacement or loosening during long-term vibration or frequent operation.

[0062] In summary, the three-position disconnect switch provided by this utility model significantly shortens the conductor rotation path by spatially distributing the isolation stationary contact, circuit breaker stationary contact, and grounding stationary contact in a triangular pattern, with the rotating shaft located at the outer center of the triangle to form an eccentric structure. This results in a more compact overall layout, reduced equipment size, and suitability for space-constrained electrical cabinets. Furthermore, the combination of the conductor rotation switching mechanism and the eccentric rotating shaft design ensures precise matching between the conductor's movement trajectory and the contact position, reducing mechanical friction and jamming risks during switching, improving opening and closing speed and operational consistency, and enhancing system reliability. The rapid switching between isolation, circuit breaking, and grounding positions can be achieved through the rotation of a single conductor, avoiding coordination errors caused by independent operation of multiple components.

[0063] Although this document frequently uses terms such as isolating stationary contact, circuit breaker stationary contact, grounding stationary contact, disconnecting switch, three-position switch conductor, insulating support structure, and rotating shaft, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model 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 therein. Such 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 this utility model.

Claims

1. An eccentric rotary double-break three-position disconnecting switch for a 40.5kV gas-insulated switchgear, characterized in that: It includes an isolating stationary contact (14), a circuit breaker stationary contact (15), a grounding stationary contact (16), and a disconnecting switch (20); the disconnecting switch (20) includes a three-position switch conductor (21), an insulating support structure (22), and a rotating shaft (23); The insulating support structure (22) is fixedly connected to the three-position switch conductor (21); The rotating shaft (23) is sleeved with the insulating support structure (22), so that the three-position switch conductor (21) rotates around the center of the rotating shaft (23); Among them, the isolating stationary contact (14), the circuit breaker stationary contact (15) and the grounding stationary contact (16) are arranged in a triangle in space, and the rotating shaft (23) is located at the outer center of the triangle, forming an eccentric structure; The three-position switch conductor (21) is rotated to switch to the isolating stationary contact (14), the circuit breaker stationary contact (15) and the grounding stationary contact (16) to connect or disconnect the isolating stationary contact (14), the circuit breaker stationary contact (15) and the grounding stationary contact (16).

2. The eccentric rotating double-break triple-position disconnector for 40.5 kV gas-insulated switchgear according to claim 1, characterized in that: It also includes a cabinet (10) on which a busbar (11), a circuit breaker (12) and a grounding bar (13) are installed. The isolating stationary contact (14) is fixedly installed on the busbar (11); the circuit breaker stationary contact (15) is installed on the circuit breaker (12); and the grounding stationary contact (16) is fixedly installed on the grounding bar (13).

3. The eccentric rotating double-break triple-position disconnector for 40.5 kV gas-insulated switchgear according to claim 2, characterized in that: The installation positions of the isolating stationary contact (14) and the circuit breaker stationary contact (15) are symmetrically distributed relative to the grounding stationary contact (16).

4. The eccentric rotating double-break triple-position disconnector for 40.5 kV gas-insulated switchgear according to claim 1, characterized in that: The three-position switch conductor (21) is composed of two symmetrically distributed bent segments (24) directly connected. The two bent segments (24) are directly connected at their center of symmetry, and each bent segment (24) is inclined upward or downward relative to each other, forming a conductive path with bends.

5. The eccentric rotating double-break triple-position disconnector for 40.5 kV gas-insulated switchgear according to claim 4, characterized in that: The angle between the two bent segments (24) is adjustable.

6. The eccentric rotating double-break triple-position disconnector for 40.5 kV gas insulated switchgear according to claim 1, characterized in that: The rotating shaft (23) is a hexagonal insulated shaft, and the insulating support structure (22) has a hexagonal hole inside, which matches the hexagonal cross section of the rotating shaft (23).

7. The eccentric rotating double-break triple-position disconnector for 40.5 kV gas insulated switchgear according to claim 1, characterized in that: The three-position switch conductor (21) and the insulating support structure (22) are fixedly connected by screws (25).

8. The eccentric rotating double-break triple-position disconnector for 40.5 kV gas insulated switchgear according to claim 1, characterized in that: The material of the conductor (21) of the three-position switch is a conductive material.

9. The eccentric rotating double-break triple-position disconnector for 40.5 kV gas-insulated switchgear according to claim 8, characterized in that: The conductive material is copper or a copper alloy.

10. The eccentric rotating double-break triple-position disconnector for 40.5 kV gas insulated switchgear according to claim 1, characterized in that: The insulating support structure (22) is made of plastic or nylon.

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