Environment-friendly gas insulated looped network switch cabinet

Abstract

The utility model discloses an environment-friendly gas insulated looped network switch cabinet, which comprises a gas box, a secondary measurement and control chamber, an operating mechanism chamber and a cable chamber, a circuit breaker switch, a three-position switch and a busbar are arranged in the gas box, and a secondary control component and a measuring instrument are arranged in the secondary measurement and control chamber. The operating mechanism chamber is provided with a barometer, a three-station operating mechanism and a circuit breaker operating mechanism; in the using field, an air pressure checking instrument is connected with the checking air supply port, so that whether the air pressure meter on the environment-friendly gas insulated looped network switch cabinet goes wrong or the air box leaks can be accurately judged, the problem can be quickly solved, and continuous, safe and healthy operation of the environment-friendly gas insulated looped network switch cabinet product is ensured. The structure of the parts of the gas tank is simplified through design, the precision and difficulty of machining and manufacturing of the parts are reduced, and meanwhile the difficulty of machining and manufacturing of the gas tank is reduced through reduction of the number of the parts of the gas tank and one-time forming design of the parts.

Description

Technical Field

[0001] This application relates to the technical field of complete sets of distribution network switchgear, and particularly relates to an environmentally friendly gas-insulated ring main unit (RMU). Background Art

[0002] Complete sets of distribution network switchgear are important equipment in the power system. Environmentally friendly gas-insulated RMUs are widely used in today's society due to their small volume, good safety, and high reliability. As is well known, an environmentally friendly gas-insulated switch is a metal-enclosed switchgear that seals high-voltage components, such as busbars, circuit breakers, disconnectors, earthing switches, etc., in a closed housing filled with a certain pressure of insulating gas. Adopting a fully enclosed structure, it can protect the core components of the switchgear from the influence of the external environment.

[0003] In the existing environmentally friendly gas-insulated RMUs, abnormal air pressure gauges and alarms occur during use. However, at the usage site, it cannot be completely determined whether the air pressure gauge is damaged or there is a gas leak in the gas tank of the RMU. As a result, it is impossible to replenish the environmentally friendly insulating gas inside the gas tank, which is likely to damage the primary components inside, affect the performance of the switchgear, and reduce its service life and operating stability. Summary of the Utility Model

[0004] This application provides an environmentally friendly gas-insulated RMU, which solves the problem that in the existing environmentally friendly gas-insulated RMUs, abnormal air pressure gauges and alarms occur during use, but at the usage site, it cannot be completely determined whether the air pressure gauge is damaged or there is a gas leak in the gas tank of the RMU. As a result, it is impossible to replenish the environmentally friendly insulating gas inside the gas tank, which is likely to damage the primary components inside, affect the performance of the switchgear, and reduce its service life and operating stability.

[0005] This application provides an environmentally friendly gas-insulated RMU, including a gas tank, a secondary measurement and control room, an operating mechanism room, and a cable room. A circuit breaker switch, a three-position switch, and a busbar are arranged inside the gas tank. Secondary control components and measuring instruments are arranged in the secondary measurement and control room. An air pressure gauge, a three-position operating mechanism, and a circuit breaker operating mechanism are arranged in the operating mechanism room;

[0006] The gas tank includes a front plate, a left plate, a right plate, a sealing plate, a lower support, a mechanism crossbeam, and a lifting lug. A threaded hole connected to the air pressure gauge is opened on the front plate. The mechanism crossbeam is fixed in the middle of the front plate. A stud hole connected to the circuit breaker operating mechanism is opened at the lower part of the front plate. Fixed holes connected to the bus coupler seat are opened at the upper parts of both the left plate and the right plate. The sealing plate is an L-shaped integrated structure. A cable seat is arranged inside the gas tank.

[0007] Preferably, the upper rear parts of the left plate and the right plate are bolt-connected by upper support members using the fixed holes.

[0008] Preferably, the lower rear parts of the front panel, left panel and right panel are integrally fixed by lower support members.

[0009] Preferably, the widths of the upper support member and the lower support member are the same as the inner width of the gas tank.

[0010] Preferably, the lower support member is a C-shaped integral structure, and bosses are arranged on the lower parts of its two side surfaces.

[0011] Preferably, one folded edge surface of the sealing plate overlaps on the front panel, and one folded edge surface is inserted on the boss.

[0012] Preferably, the pressure gauge is of h-type setting, the main end is connected to the threaded hole on the front panel, one branch end is the pressure gauge, and the other branch end is the calibration air supplement port of the one-way pressure valve structure.

[0013] Preferably, the three-position operating mechanism is arranged on the mechanism cross beam outside the gas tank, the circuit breaker operating mechanism is arranged below the three-position operating mechanism outside the gas tank, and the three-position operating mechanism and the circuit breaker operating mechanism are connected by an interlocking member.

[0014] Preferably, the cable base is arranged at the lower front part of the front panel, the bus coupler base is installed in the upper middle parts of the left panel and the right panel, and the bus couplers on both sides are connected by busbars in the middle of the gas tank.

[0015] Preferably, the circuit breaker switch and the three-position switch are installed and arranged inside the gas tank, the circuit breaker switch is below the three-position switch, and the circuit breaker switch and the three-position switch are respectively connected to the circuit breaker operating mechanism and the three-position operating mechanism outside the gas tank through sealing connectors.

[0016] Compared with the prior art, an environmentally friendly gas-insulated ring main unit provided by the present application has at least the following beneficial effects:

[0017] 1. At the use site, by connecting with the calibration air supplement port through the air pressure calibration instrument, it can be accurately determined whether there is a problem with the pressure gauge on the environmentally friendly gas-insulated ring main unit or whether the gas tank leaks, so as to quickly solve the problem, avoid the wrong treatment method caused by unclear problems from affecting the product performance, and ensure the continuous, safe and healthy operation of the environmentally friendly gas-insulated ring main unit product.

[0018] 2. By designing, the structure of the gas tank parts is simplified, the precision and difficulty of parts processing and manufacturing are reduced, and at the same time, by reducing the number of gas tank parts and the one-time forming design of parts, the difficulty of gas tank processing and manufacturing is reduced. Description of the Drawings

[0019] To more clearly illustrate the technical solution of the present application, the accompanying drawings required for use in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0020] Figure 1 Schematic structural diagram of an environmentally friendly gas-insulated switchgear cabinet of the present application;

[0021] Figure 2 Schematic external structure diagram of a gas tank of the present application;

[0022] Figure 3 Schematic structural diagram of a gas tank component of the present application;

[0023] Figure 4 Schematic partial diagram of the positioning of a sealing plate of the present application;

[0024] Figure 5 Schematic assembly diagram of internal components of a gas tank of the present application;

[0025] In the figure: 1. Gas tank; 2. Secondary measurement and control room; 3. Operating mechanism room; 4. Cable room; 5. Pressure gauge; 6. Three-position operating mechanism; 7. Circuit breaker operating mechanism; 8. Cable base; 9. Circuit breaker switch; 10. Three-position switch; 11. Bus coupler base; 12. Busbar; 101. Front plate; 102. Left plate; 103. Sealing plate; 104. Lifting lug; 105. Right plate; 106. Mechanism crossbeam; 107. Lower support; 108. Upper support; 109. Boss; 51. Calibration and gas filling port. Specific implementation manners

[0026] In order to enable those skilled in the art to better understand the technical solution in the present application, the technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0027] As Figures 1 to 5 shown, it is a solution of this embodiment.

[0028] An environmentally friendly gas-insulated ring main unit switchgear includes a gas tank 1, a secondary measurement and control room 2, an operating mechanism room 3 and a cable room 4. The gas tank 1 is arranged at the rear upper part, the secondary measurement and control room 2 is arranged at the front upper part, the operating mechanism room 3 is arranged at the front middle part, and the cable room 4 is arranged at the bottom. A circuit breaker switch 9, a three-position switch 10 and a busbar 12 are arranged in the gas tank 1. Secondary control components and measuring instruments are arranged in the secondary measurement and control room 2. A pressure gauge 5, a three-position operating mechanism 6 and a circuit breaker operating mechanism 7 are arranged in the operating mechanism room 3. The pressure gauge 5 is used to monitor the gas state in the gas tank 1. The above solution is equivalent to the corresponding setting of the environmentally friendly gas-insulated ring main unit switchgear in the prior art and has been fully disclosed, so no further elaboration will be made here.

[0029] The air box 1 includes a front plate 101, a left plate 102, a right plate 105, a sealing plate 103, a lower support member 107, a mechanism cross beam 106, and a lifting lug 104. Among them, the front plate 101 is an integrated six-bending surface structure. A threaded hole connected to the pressure gauge 5 is provided on the front plate 101. The mechanism cross beam 106 is fixed in the middle of the front plate 101. A stud hole connected to the circuit breaker operating mechanism 7 is provided at the lower part of the front plate 101. Fixed holes connected to the bus coupler seat 11 are provided at the upper parts of both the left plate 102 and the right plate 105. The sealing plate 103 is an L-shaped integrated structure. A cable seat 8 is arranged inside the air box 1. In actual setting, the air box 1 is welded by the front plate 101, the left plate 102, the right plate 105, the lower support member 107, the sealing plate 103, the mechanism cross beam 106, and the lifting lug 104 through sheet metal parts. First, each component part is connected together by spot welding, then the internal and external devices and mechanisms are assembled and debugged and connected. Finally, after the sealing plate 103 is connected by spot welding, the overall splicing weld of the air box 1 is welded and connected.

[0030] In this embodiment, in order to facilitate the splicing of components, preferably, the upper rear parts of the left plate 102 and the right plate 105 are bolt-connected by an upper support member 108 using the fixed holes. Preferably, the lower rear parts of the front plate 101, the left plate 102, and the right plate 105 are integrally fixed by the lower support member 107. Preferably, the widths of the upper support member 108 and the lower support member 107 are the same as the inner width of the air box 1. Using the upper support member 108 as the positioning tooling for the left plate 102 and the right plate 105 not only facilitates the splicing of components but also ensures the width of the air box 1. Among them, the lower support member 107 serves as the tooling to ensure the width of the air box, facilitating the positioning when the sealing plate 103 seals the box, and the space in this area can hold desiccants to ensure the relative position of the desiccants inside the air box 1.

[0031] Preferably, the lower support member 107 is a C-shaped integrated structure, and convex platforms 109 are provided at the lower parts of its two side surfaces. Preferably, one folded edge surface of the sealing plate 103 overlaps on the front plate 101, and one folded edge surface is inserted on the convex platform 109. Since one folded edge surface of the sealing plate 103 overlaps on the bending surface of the front plate 101, and the overlapping length can be long or short, the dimensional accuracy requirements for the sealing plate 103 are not high, which is convenient for the production and processing of sheet metal parts; the design of the convex platform 109 of the lower support member 107 facilitates one side of the sealing plate 103 to overlap on the convex platform surface, and it can be accurately positioned without other positioning tooling fixtures.

[0032] Preferably, the pressure gauge 5 is of an H-type setting. The main terminal is connected to the threaded hole on the front panel 101. One branch terminal is the pressure gauge 5, which displays the gas pressure and density status inside the gas tank. The other branch terminal is the calibration air replenishment port 51 with a one-way pressure valve structure. When there are abnormalities and alarms in the pressure gauge of the environmentally friendly gas-insulated ring main unit, on-site, by using a pressure calibration instrument and connecting it to the calibration air replenishment port 51, it can be accurately determined whether there is a problem with the pressure gauge 5 on the environmentally friendly gas-insulated ring main unit or whether there is a leakage in the gas tank 1. In the prior art, only one branch is connected to the pressure gauge and there is no other branch, so on-site calibration cannot be achieved. When replenishing air on-site, the original pressure gauge needs to be removed, and the pressure gauge needs to be reinstalled after the air replenishment is completed.

[0033] Preferably, the three-position operating mechanism 6 is arranged on the mechanism crossbeam 106 outside the gas tank 1. The circuit breaker operating mechanism 7 is arranged below the three-position operating mechanism 6 outside the gas tank 1. The three-position operating mechanism 6 and the circuit breaker operating mechanism 7 are connected by an interlocking component. The interlocking design between the operating mechanisms realizes the five-prevention interlock of the switchgear.

[0034] Preferably, the cable socket 8 is arranged at the lower front part of the front panel 101. The bus coupler socket 11 is installed in the upper middle parts of the left panel 102 and the right panel 105. The two-sided bus coupler sockets 11 are connected by a busbar 12 in the middle inside the gas tank 1. One end of the cable socket 8 and the bus coupler socket 11 is inside the gas tank 1, and the other end is outside the gas tank 1. The part of the cable socket 8 outside the gas tank realizes the connection of the incoming and outgoing cables, and the external part of the bus coupler socket 11 realizes the connection between two adjacent switchgears when they are paralleled.

[0035] Preferably, the circuit breaker switch 9 and the three-position switch 10 are installed and arranged inside the gas tank 1. The circuit breaker switch 9 is below the three-position switch 10. The circuit breaker switch 9 and the three-position switch 10 are respectively connected to the circuit breaker operating mechanism 7 and the three-position operating mechanism 6 outside the gas tank 1 through sealed connectors.

[0036] For the environmentally friendly gas-insulated ring main unit provided in this application, during actual installation, the gas tank 1 first spot-welds each component together, then assembles, adjusts and connects the internal and external devices and mechanisms, and finally spot-welds and connects the sealing plate 103 and then welds the overall splicing weld of the gas tank. This avoids the problem of the next process having to wait in vain when the previous process is not completed during the work process. When in use, when there are abnormalities and alarms in the pressure gauge of the environmentally friendly gas-insulated ring main unit, on-site, by using a pressure calibration instrument and connecting it to the calibration air replenishment port 51, it can be accurately determined whether there is a problem with the pressure gauge 5 on the environmentally friendly gas-insulated ring main unit or whether there is a leakage in the gas tank 1. If there is a leakage in the gas tank 1, the gas can be replenished through the calibration air replenishment port 51, improving the stability of the device during use.

[0037] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper part", "middle part", "left and right", etc. is based on the orientation or positional relationship shown in the drawings, and the terms "L-shaped", "C-shaped", "h-shaped", etc. used to describe the shape of components are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation and shape, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0038] In the description of the present application, unless otherwise clearly defined, terms such as "set", "provided with", "processed", "assembled", "bus bar", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution. For example, the term "connected" can be welding, bolt or rivet connection; it can be directly connected or indirectly connected through an intermediate medium.

[0039] After considering the specification and practicing the application disclosed herein, those skilled in the art will readily conceive of other embodiments of the present application. The present application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field disclosed by the present application. The specification and examples are only regarded as exemplary, and the true scope of the present application is pointed out by the claims.

[0040] It should be understood that the present application is not limited to the exact structure already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The embodiments of the present application described above do not constitute a limitation on the protection scope of the present application.

Claims

1. An environmentally friendly gas-insulated ring main unit, comprising a gas tank (1), a secondary measurement and control room (2), an operating mechanism room (3) and a cable room (4), characterized in that, Inside the air box (1), there are a circuit breaker switch (9), a three-position switch (10), and a bus bar (12). Inside the secondary measurement and control room (2), there are secondary control components and measuring instruments. Inside the operating mechanism room (3), there is a pressure gauge (5), a three-position operating mechanism (6), and a circuit breaker operating mechanism (7). The air box (1) includes a front plate (101), a left plate (102), a right plate (105), a sealing plate (103), a lower support (107), a mechanism cross beam (106), and a lifting lug (104). The front plate (101) is provided with a threaded hole connected to the pressure gauge (5). The mechanism cross beam (106) is fixed in the middle of the front plate (101). The lower part of the front plate (101) is provided with a stud hole connected to the circuit breaker operating mechanism (7). The upper parts of both the left plate (102) and the right plate (105) are provided with fixing holes connected to the bus coupler seat (11). The sealing plate (103) is an L-shaped integral structure. Inside the air box (1), there is a cable seat (8).

2. The environmentally friendly gas-insulated ring main unit switchgear according to claim 1, wherein The upper rear parts of the left plate (102) and the right plate (105) are bolt-connected through an upper support (108) using the fixing holes.

3. The environmentally friendly gas-insulated ring main unit switchgear according to claim 2, wherein, The lower rear parts of the front plate (101), the left plate (102), and the right plate (105) are integrally fixed through a lower support (107).

4. The environmentally friendly gas-insulated ring main unit switchgear according to claim 3, characterized in that, The widths of the upper support (108) and the lower support (107) are the same as the inner width of the air box (1).

5. An environmentally friendly gas-insulated ring main unit according to claim 3, characterized in that, The lower support (107) is a C-shaped integral structure, and lower parts of both its side surfaces are provided with bosses (109).

6. An environmentally friendly gas-insulated ring main unit switchgear according to claim 5, characterized in that, One folded side surface of the sealing plate (103) overlaps on the front plate (101), and one folded side surface is inserted on the bosses (109).

7. An environmentally friendly gas-insulated ring main unit according to any one of claims 1 to 6, characterized in that, The pressure gauge (5) is arranged in an h shape. The main end is connected to the threaded hole on the front plate (101). One branch end is the pressure gauge (5), and the other branch end is a calibration and air filling port (51) with a one-way pressure valve structure.

8. An environmentally friendly gas-insulated ring main unit according to claim 1, characterized in that, The three-position operating mechanism (6) is arranged on the mechanism cross beam (106) outside the air box (1). The circuit breaker operating mechanism (7) is arranged below the three-position operating mechanism (6) outside the air box (1). The three-position operating mechanism (6) and the circuit breaker operating mechanism (7) are connected through an interlocking part.

9. An environmentally friendly gas-insulated ring main unit according to claim 8, characterized in that, The cable seat (8) is arranged at the lower front part of the front plate (101). The bus coupler seats (11) are installed in the upper middle parts of the left plate (102) and the right plate (105). The bus coupler seats (11) on both sides are connected through the bus bar (12) in the middle inside the air box (1).

10. An environmentally friendly gas-insulated ring main unit according to claim 1, characterized in that, The circuit breaker switch (9) and the three-position switch (10) are installed and arranged inside the air box (1). The circuit breaker switch (9) is below the three-position switch (10). The circuit breaker switch (9) and the three-position switch (10) are respectively connected to the circuit breaker operating mechanism (7) and the three-position operating mechanism (6) outside the air box (1) through sealing connectors.

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