Compact upper isolation ring network cabinet for environmental protection gas

Abstract

The application relates to the technical field of ring main units, and provides a compact upper isolation environment-friendly gas ring main unit, which comprises a gas tank body, upper isolation movable and static contacts fixed in the gas tank body through a switch support frame, a conductive busbar row, a solid-sealed pole, a grounding knife switch, a circuit breaker mechanism main shaft and an isolation knife switch rotating shaft, and a side incoming line sleeve and an outgoing line sleeve are arranged on the outer side of the gas tank body; the solid-sealed pole is a full solid-sealed structure, and three-phase solid-sealed poles are horizontally arranged in the gas tank body; and the upper isolation movable and static contacts are designed in linkage with the grounding knife switch. The full solid-sealed structure of the solid-sealed pole reduces the size of the solid-sealed pole itself, the horizontal arrangement mode reduces the size of the circuit breaker, the size of the ring main unit is further reduced, and the arrangement in a limited space is facilitated.

Description

Technical Field

[0001] This application belongs to the field of ring main unit technology, specifically relating to a compact top-isolated environmentally friendly gas ring main unit. Background Technology

[0002] A ring main unit (RNB) is a group of electrical transmission and distribution devices installed in a metal or non-metal insulated cabinet. Its core components include load switches and fuses, and it is mainly used to realize power supply control, fault isolation, and protection functions in a ring distribution network. RNBs are commonly found in urban distribution networks, industrial parks, and power systems of large building complexes. For example, in urban centers, multiple RNBs are interconnected to form a grid-like power supply network, which can not only cope with sudden faults but also flexibly allocate loads to adapt to changes in electricity demand in different areas.

[0003] Currently, there are SF6 gas ring main units and environmentally friendly gas ring main units. SF6 ring main units are small in size, have high electrical safety, and are highly flexible in installation. However, SF6 is a potent greenhouse gas with a global warming potential far exceeding that of carbon dioxide, and it can remain in the atmosphere for a long time, failing to meet national and power grid environmental protection requirements. Ordinary environmentally friendly gas ring main units have excellent environmental performance, but their insulation performance is lower, they occupy a larger area, are unsuitable for various space-constrained site environments, and have high maintenance costs. Summary of the Invention

[0004] This application provides a compact, top-isolated, environmentally friendly gas ring main unit to solve or partially solve the problems mentioned in the background art.

[0005] This application provides a compact top-isolated environmentally friendly gas ring main unit, including: a gas box body and top-isolated moving and stationary contacts, conductive busbars, solid-sealed poles, grounding switch, circuit breaker main shaft, and isolation switch shaft fixed inside the gas box body by a switch support frame. Side inlet bushings and outlet bushings are provided on the outside of the gas box body.

[0006] The solid-sealed pole has a fully solid-sealed structure, and the three-phase solid-sealed pole is horizontally placed inside the gas box body.

[0007] The upper isolating moving and stationary contacts are linked with the grounding switch. When the upper isolating moving and stationary contacts are open, their moving contact separates from the stationary contact and overlaps with the grounding switch horizontally. When the isolating switch is closed, the grounding switch opens, and the moving contact and stationary contact bounce and stick together.

[0008] Preferably, the stationary contact of the upper isolating moving and stationary contact is connected to the incoming line in the side incoming line bushing through a conductive busbar, and its moving contact is sleeved on the isolating knife shaft. The isolating knife shaft is connected to the external isolating switch operating mechanism. The connection between the moving contact and the stationary contact is provided with a voltage equalization cover.

[0009] Preferably, the isolation blade shaft is made of a nylon-glass fiber composite material.

[0010] Preferably, the solid-sealed pole, the upper isolating moving and stationary contacts, and the grounding switch are fixed to the switch support frame by bolts, and the switch support frame has a hollow structure.

[0011] Preferably, a shielding cover is provided between the isolating switches consisting of the upper isolating moving and stationary contacts and the grounding switch.

[0012] Preferably, the solid-sealed pole includes an epoxy resin shell and a flexible connector, a vacuum interrupter, a moving contact conductive copper busbar, and an insulating pull rod disposed within the epoxy resin shell. The flexible connector is movably connected to the moving contact conductive copper busbar through the vacuum interrupter, and the flexible connector is movably connected to the circuit breaker main shaft through the insulating pull rod.

[0013] Preferably, the main shaft of the circuit breaker mechanism is a straight rod type rotating shaft, which is placed horizontally inside the gas box body and has a rotation angle of ±10°. The main shaft of the circuit breaker is hinged to the insulating tie rod, which drives it to move horizontally.

[0014] Compared with the prior art, the beneficial effects of this application are as follows:

[0015] (1) The solid-sealed pole structure of this application reduces the size of the solid-sealed pole itself, and the horizontal placement reduces the size of the circuit breaker, thereby reducing the size of the ring main unit, which is beneficial for arrangement in a limited space.

[0016] (2) The separation design of the upper isolation dynamic and static contact structure and the grounding switch mechanism in this application is different from the commonly used 3-position single isolation switch design. It reduces the adhesion of dynamic and static contacts under non-grounding conditions, improves the pass rate of dynamic and thermal tests, and the optimized isolation switch shaft reduces the material usage of the whole machine while ensuring rigidity and strength. The overall installation of the isolation mechanism is compact, further reducing the size of the ring main unit.

[0017] (3) The straight rod type rotating shaft breaking mechanism of this application is an integrated welded connecting rod design, which converts the rotation of the main shaft into the lateral displacement of the pole column moving contact, with high three-phase action synchronization rate and low jamming rate. Attached Figure Description

[0018] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a front view of the overall structure of this application.

[0020] Figure 2 This is a left view of the overall structure of this application.

[0021] Figure 3 This is a left sectional view of this application.

[0022] Figure 4 This is a front sectional view of this application.

[0023] Figure 5 This is a front view of the internal structure of this application.

[0024] Figure 6 This is an isometric schematic diagram of the internal structure of this application.

[0025] Figure 7 This is a cross-sectional view of the solid-sealed pole of this application.

[0026] In the picture:

[0027] 1. Gas box body; 2. Switch support frame; 3. Upper isolating moving and stationary contacts; 4. Solid-sealed pole; 5. Grounding switch; 6. Equalizing cover; 7. Circuit breaker main shaft; 8. Side inlet bushing; 9. Outlet bushing; 10. Conductive busbar; 12. Operating mechanism compartment; 13. Cable compartment assembly; 14. Operating panel; 15. Upper inlet bushing; 18. Moving contact; 19. Stationary contact; 20. Isolation shaft; 21. Connecting rod shaft; 22. Moving contact conductive copper busbar; 23. Epoxy resin shell; 25. Vacuum interrupter; 26. Insulating pull rod. Detailed Implementation

[0028] The specification and claims use certain terms to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0029] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and 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. Therefore, they should not be construed as limitations on this application.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] Example 1

[0032] like Figures 1 to 7 As shown, this application provides a compact top-isolated environmentally friendly gas ring main unit, including: a gas tank body 1 and top-isolated moving and stationary contacts 3, conductive busbars 10, solid-sealed poles 4, grounding switch 5, circuit breaker main shaft 7, and isolation switch shaft 20, which are fixed inside the gas tank body 1 by a switch support frame 2. A side inlet bushing 8 and an outlet bushing 9 are provided on the outside of the gas tank body 1. The solid-sealed poles 4 are fully solid-sealed structures, and the three-phase solid-sealed poles 4 are horizontally placed inside the gas tank body 1.

[0033] like Figure 1 , Figure 2 As shown, the ring main unit consists of an air box body 1, an operating mechanism compartment 12, a cable compartment assembly 13, an operating panel 14, and an upper inlet bushing assembly 15. Among them, the air box body 1 is the core component, which is filled with dry air to achieve insulation while improving environmental performance.

[0034] Specifically, the stationary contact 19 of the upper isolating moving and stationary contact 3 is connected to the incoming line in the side incoming line bushing 8 through the conductive busbar 10, and its moving contact 18 is sleeved on the isolating knife rotating shaft 20. The isolating knife rotating shaft 20 is connected to the external isolating switch operating mechanism. The connection between the moving contact 18 and the stationary contact 19 is provided with a voltage equalization cover 6. The voltage equalization cover 6 can effectively compensate for the lack of air insulation performance and reduce the risk of breakdown.

[0035] The upper isolating moving and stationary contact 3 is linked with the grounding switch 5. When the upper isolating moving and stationary contact 3 is open, its moving contact 18 and stationary contact 19 separate and are horizontally connected to the grounding switch 5. When the isolating switch is closed, the user operates the external isolating switch operating mechanism, the grounding switch 5 is opened, and the moving contact 18 and stationary contact 19 bounce and stick together, realizing instantaneous state switching.

[0036] Preferably, the isolation blade shaft 20 is made of a nylon-glass fiber composite material, which helps to reduce weight while increasing electrical insulation performance.

[0037] Specifically, the solid-sealed pole 4, the upper isolation moving and stationary contact 3, and the grounding switch 5 are fixed to the switch support frame 2 by bolts, and the switch support frame 2 adopts a hollow process.

[0038] Preferably, a shielding cover is provided between the isolation switches consisting of the upper isolation moving and stationary contacts 3 and the grounding switch 5, which helps to reduce the electric field strength inside the box and improve the electrical performance and safety of the equipment.

[0039] Specifically, the solid-sealed pole 4 includes an epoxy resin shell 23 and a flexible connector, a vacuum interrupter 25, a moving contact conductive copper busbar 22, and an insulating pull rod 26 disposed within the epoxy resin shell 23. The flexible connector is movably connected to the moving contact conductive copper busbar 22 through the vacuum interrupter 25, and the flexible connector is movably connected to the main shaft 7 of the circuit breaker mechanism through the insulating pull rod 26.

[0040] This application uses an epoxy resin shell 23 to fully encapsulate the internal components of the solid-sealed terminal 4, which helps to improve safety and reduce the size of the solid-sealed terminal 4.

[0041] Furthermore, the main shaft 7 of the circuit breaker mechanism is a straight rod type rotating shaft, which is placed horizontally inside the air box body 1 and has a rotation angle of ±10°. The main shaft 7 of the circuit breaker mechanism is hinged to the insulating pull rod 26, which drives it to move horizontally.

[0042] Implementation principle:

[0043] The energized circuit passes through the side inlet bushing 8 and the conductive busbar 10 to the stationary contact 19. The grounding switch mechanism 5 opens, and the moving contact 18 contacts the stationary contact 19, achieving conductivity through the isolation mechanism. When the circuit breaker is closed, the main shaft 7 of the circuit breaker mechanism rotates, and the integrated transversely sealed pole 4 closes. The circuit then conducts current through a flexible connection to the outlet bushing 9. This process achieves current conduction for a single-phase circuit. The aforementioned inlet bushing 8, upper isolation moving and stationary contacts 3, and transversely sealed pole 4 are grouped in sets of three, enabling the opening and closing control of the three-phase circuit within a single cabinet.

[0044] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A compact, top-isolated, environmentally friendly gas ring main unit, characterized in that, include: The gas box body (1) and the upper isolation moving and stationary contacts (3), conductive busbar (10), solid sealing pole (4), grounding switch (5), circuit breaker main shaft (7), isolation knife shaft (20) are fixed inside the gas box body (1) via switch support frame (2). The gas box body (1) is provided with a side inlet bushing (8) and an outlet bushing (9). The solid-sealed pole (4) is a fully solid-sealed structure, and the three-phase solid-sealed pole (4) is horizontally placed inside the gas box body (1); The upper isolating moving and stationary contact (3) is linked with the grounding switch (5). When the upper isolating moving and stationary contact (3) is open, its moving contact (18) separates from the stationary contact (19) and is horizontally connected to the grounding switch (5). When the isolating switch is closed, the grounding switch (5) opens, and the moving contact (18) and the stationary contact (19) bounce and stick together.

2. The compact top-isolated environmentally friendly gas ring main unit according to claim 1, characterized in that: The stationary contact (19) of the upper isolating moving and stationary contact (3) is connected to the incoming line in the side incoming line sleeve (8) through the conductive busbar (10), and its moving contact (18) is sleeved on the isolating knife rotating shaft (20). The isolating knife rotating shaft (20) is connected to the external isolating switch operating mechanism. The connection between the moving contact (18) and the stationary contact (19) is provided with a voltage equalization cover (6).

3. A compact, top-isolated, environmentally friendly gas ring main unit according to claim 2, characterized in that: The isolation blade shaft (20) is made of a nylon-glass fiber composite material.

4. The compact top-isolated environmentally friendly gas ring main unit according to claim 1, characterized in that: The solid-sealed pole (4), the upper isolation moving and stationary contact (3), and the grounding switch (5) are fixed to the switch support frame (2) by bolts. The switch support frame (2) has a hollow structure.

5. A compact, top-isolated, environmentally friendly gas ring main unit according to claim 1, characterized in that: A shielding cover is provided between the isolation switches consisting of the upper isolation moving and stationary contacts (3) and the grounding switch (5).

6. A compact, top-isolated, environmentally friendly gas ring main unit according to claim 1 or 2, characterized in that: The solid-sealed pole (4) includes an epoxy resin shell (23) and a flexible connector, a vacuum interrupter (25), a moving contact conductive copper busbar (22), and an insulating pull rod (26) disposed in the epoxy resin shell (23). The flexible connector is movably connected to the moving contact conductive copper busbar (22) through the vacuum interrupter (25), and the flexible connector is movably connected to the main shaft (7) of the circuit breaker mechanism through the insulating pull rod (26).

7. A compact, top-isolated, environmentally friendly gas ring main unit according to claim 6, characterized in that: The main shaft (7) of the circuit breaker mechanism is a straight rod type rotating shaft, which is placed horizontally inside the air box body (1) and has a rotation angle of ±10°. The main shaft (7) of the circuit breaker mechanism is hinged to the insulating pull rod (26) and drives it to move horizontally.

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