Gas-insulated looped network switchgear

Abstract

The utility model discloses a gas insulated looped network switchgear, which at least comprises a circuit breaker cabinet, a load switch cabinet and a control room, the load switch cabinet and the circuit breaker cabinet are arranged in parallel, a gas tank of the load switch cabinet and the circuit breaker cabinet is an integrated gas tank, the integrated gas tank is inverted T-shaped, the gas tank of the circuit breaker cabinet is a middle tank body space of the integrated gas tank, and the control room is arranged in the middle of the integrated gas tank. The load switch cabinet gas box is a box body space on at least one side of the integrated gas box, and the control chambers are located on two sides of the circuit breaker cabinet. According to the utility model, the inverted T-shaped integrated gas tank is adopted, so that the arrangement of components in the gas tank can be satisfied, the space is saved, and the arrangement of a control room of the switch cabinet is facilitated; the size is small, the occupied space is small, equipment miniaturization is facilitated, and the comprehensive engineering cost is low; primary components of all the cabinet bodies are arranged in the integrated air box together, the whole equipment adopts a modularized and standardized structural design, batch production and large-scale production are facilitated, the number of product production procedures is small, debugging and detection are convenient, the production cost is low, and the comprehensive cost of overhaul and maintenance is low.

Description

Technical Field

[0001] This utility model relates to a gas-insulated ring network switchgear. Background Technology

[0002] A ring main unit is an electrical device consisting of a group of high-voltage switchgear assembled into a ring network power supply unit. A ring network refers to a ring distribution network, in which the power supply trunk line forms a closed loop. The power supply source supplies power to this ring trunk line, and then distributes the power outwards through high-voltage switchgear line one by one. Its core components include load switches, circuit breakers, and disconnect switches, and it has the advantages of simple structure, small size, low price, and safe power supply.

[0003] Gas-insulated ring main units are widely used in substations and prefabricated substations in load centers such as urban residential areas, high-rise buildings, large public buildings, and factories. The switches, busbars, and supporting insulation components are housed in a fully enclosed metal casing filled with low-pressure sulfur hexafluoride gas as the arc-quenching and insulating medium, and connected to external cables through sealed bushings. However, existing gas-insulated ring main units still have structural design flaws, specifically:

[0004] (1) An unreasonable structural design results in a large product size, a large space occupation, which is not conducive to equipment miniaturization and has a high overall project cost.

[0005] (2) The selection of components is unreasonable and the structural design is not modular or standardized, which is not conducive to mass production and large-scale production, resulting in high production costs.

[0006] (3) The unreasonable design of the stainless steel gas box affects the welding of the gas box, the installation of components, and the assembly of the switch cabinet, resulting in more production processes, inconvenient debugging and testing, and high labor intensity.

[0007] (4) The design structure is unreasonable, which is not conducive to the maintenance and subsequent repair of the product during operation, and it is not convenient to replace parts on site. The cost of subsequent repair and maintenance is high. For example, the fully welded air box (the components are sealed and welded after installation) can only be opened after the air box is cut. Utility Model Content

[0008] The purpose of this utility model is to provide a gas-insulated ring network switchgear that is conducive to equipment miniaturization, easy installation, low production cost, and mass production and large-scale production.

[0009] The object of the utility model is achieved by the following technical measures: A gas-insulated ring main unit switchgear, characterized in that it consists of at least a circuit breaker cabinet, a load switch cabinet and a control room. The load switch cabinet and the circuit breaker cabinet are arranged side by side. The gas tanks of the load switch cabinet and the circuit breaker cabinet are an integrated gas tank, and the integrated gas tank is in a convex shape. Among them, the gas tank of the circuit breaker cabinet is the middle box space of the integrated gas tank, and the gas tank of the load switch cabinet is at least one side box space of the integrated gas tank. The control room is located on both sides of the circuit breaker cabinet.

[0010] The gas tanks of each cabinet of the utility model adopt an integrated gas tank, and the external shape structure of the gas tank is in a "convex" shape, which can not only meet the arrangement of components in the gas tank, but also save space and facilitate the arrangement of the switchgear control room; adopting an integrated gas tank, it has a small volume and occupies little space, which is conducive to the miniaturization of the equipment and the low comprehensive project cost; the primary components of each cabinet are jointly arranged in the integrated gas tank, and the whole equipment adopts a modular and standardized structural design, which is conducive to mass production and large-scale production. The product production process is less, the commissioning and detection are convenient, the production cost is low, and the comprehensive maintenance cost is low. In the utility model, the load switch cabinets are a pair and are arranged side by side on both sides of the circuit breaker cabinet, and the gas tanks of the two load switch cabinets are respectively the two side box spaces of the integrated gas tank.

[0011] The gas-insulated ring main unit switchgear of the utility model includes a cable lifting cabinet. The cable lifting cabinet and the load switch cabinet are arranged side by side on both sides of the circuit breaker cabinet, and the gas tanks of the cable lifting cabinet and the load switch cabinet are respectively the two side box spaces of the integrated gas tank.

[0012] In the utility model, a first reinforcing beam that does not interfere with the installation of components and a second reinforcing beam that interferes with the installation of components are provided in the integrated gas tank. The first reinforcing beam is welded to the integrated gas tank as a whole, and the second reinforcing beam is connected to the integrated gas tank as a whole through a detachable structure. It can ensure the smooth installation of the circuit breaker, load switch, disconnector, copper conductor and its supporting insulating parts, and prevent the deformation of the gas tank.

[0013] A circuit breaker installation hole for installing a circuit breaker is opened on the front of the integrated gas tank of the utility model, and a component installation hole for installing other components is opened on the back of the integrated gas tank. A detachable rear cover plate is provided on the component installation hole. The rear cover plate is a stainless steel plate formed by one-time cold pressing, and has a raised sealing ring groove and an I-shaped reinforcing rib pressed by a mold on it. The notch of the sealing ring groove is located on the inner plate surface of the rear cover plate, and a sealing ring is arranged in the sealing ring groove. A third reinforcing beam with a Π-shaped cross section is welded on the outer plate surface of the rear cover plate, and the middle part of the reinforcing rib is located inside the third reinforcing beam. The two ends of the third reinforcing beam extend to both sides of the rear cover plate.

[0014] The integrated gas box of this invention has all sealing sleeves at the same height, which facilitates the connection of external cables to the switchgear.

[0015] Compared with the prior art, the present invention has the following significant advantages:

[0016] (1) The air box of each cabinet of this utility model adopts an integrated air box. The external structure of the air box is "convex" shaped, which can not only meet the arrangement of components inside the air box, but also save space and facilitate the arrangement of the switch cabinet control room.

[0017] (2) This utility model adopts an integrated air box, which is small in size and occupies little space, which is conducive to the miniaturization of equipment and the overall project cost is low.

[0018] (3) The primary components of each cabinet in this utility model are all set in an integrated air box, which does not affect the welding of the air box or the installation of components. The entire equipment adopts a modular and standardized structural design, which is conducive to achieving mass production and large-scale production. The product has fewer production processes, is easy to debug and test, has low labor intensity, and low production cost.

[0019] (4) In an emergency, the rear cover of this utility model can be opened to replace parts on-site, resulting in low overall maintenance costs. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a front view of Embodiment 1 of this utility model;

[0022] Figure 2 This is a front sectional view of the internal structure of the gas box in Embodiment 1 of this utility model;

[0023] Figure 3 This is a side sectional view of the interior of the air box (air box of the cable lifting cabinet) in Embodiment 1 of this utility model;

[0024] Figure 4 This is a side sectional view of the gas box interior (gas box of circuit breaker cabinet) of Embodiment 1 of this utility model;

[0025] Figure 5 This is a side sectional view of the interior of the gas box (gas box of the load switch cabinet) in Embodiment 1 of this utility model;

[0026] Figure 6 This is a rear view of the air box in Embodiment 1 of this utility model;

[0027] Figure 7 This is a front view of the air box in Embodiment 1 of this utility model;

[0028] Figure 8 This is a side sectional view of the gas box (gas box of circuit breaker cabinet) of Embodiment 1 of this utility model.

[0029] Figure 9 This is a side sectional view of the gas box (gas box of load switch cabinet) of Embodiment 1 of this utility model;

[0030] Figure 10 This is a front view of the rear cover plate of the air box in Embodiment 1 of this utility model;

[0031] Figure 11 This is a side sectional view of the rear cover plate of the air box in Embodiment 1 of this utility model;

[0032] Figure 12 This is a front view of Embodiment 2 of this utility model;

[0033] Figure 13 This is a front sectional view of the internal structure of the gas box in Embodiment 2 of this utility model.

[0034] In the diagram: 1-Cable lifting cabinet; 1.1-First conductive component; 1.2-First connecting copper busbar; 1.3-First supporting insulator; 1.4-Second connecting copper busbar; 1.5-First sealing sleeve; 2-Circuit breaker cabinet; 2.1-Second conductive component; 2.2-Disconnecting switch; 2.3-Circuit breaker; 2.4-Vacuum interrupter; 2.5-Second sealing sleeve; 3-Load switch cabinet; 3.1-Third conductive component; 3.2-Load switch; 3.3-Second supporting insulator; 3.4-Third connecting copper busbar; 3.5-Third sealing sleeve; 4-Control room; 5-Integrated gas box; 5.1-Component mounting hole; 5.2-First reinforcing beam; 5.3-Circuit breaker mounting hole; 5.4-Second reinforcing beam; 6-Rear cover plate; 6.1-Reinforcing rib; 6.2-Sealing ring groove; 6.3-Third reinforcing beam. Detailed Implementation

[0035] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. 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.

[0036] Example 1

[0037] like Figures 1-11 The image shown is a gas-insulated ring network switchgear according to this utility model. (See attached image.) Figure 1It consists of a cable lifting cabinet 1 (D cabinet), a circuit breaker cabinet 2 (V cabinet), a load switch cabinet 3 (C cabinet), and a control room 4, referred to as the DVC scheme. The cable lifting cabinet 1, circuit breaker cabinet 2, and load switch cabinet 3 are arranged side-by-side from left to right. The air boxes for the cable lifting cabinet 1, circuit breaker cabinet 2, and load switch cabinet 3 are integrated air boxes 5, which are U-shaped. The air box for circuit breaker cabinet 2 is the central space of the integrated air box 5, the air box for cable lifting cabinet 1 is the left side space, and the air box for load switch cabinet 3 is the right side space. The control room 4 is used to install secondary instruments and control systems, and is located on both sides of the circuit breaker cabinet 2 and on top of the load switch cabinet 3 and cable lifting cabinet 1.

[0038] like Figure 2 , Figure 3 As shown, the cable lifting cabinet 1 has no major components and consists of a first conductive element 1.1, a first connecting copper busbar 1.2, a first supporting insulator 1.3, a second connecting copper busbar 1.4, and a first sealing sleeve 1.5. Figure 2 , Figure 4 As shown, the main components of the circuit breaker cabinet 2 are the circuit breaker 2.3 and the three-position switch 2.2, including the second conductive element 2.1 and the second sealing sleeve 2.5; the vacuum interrupter 2.4 is the core component of the circuit breaker 2.3.

[0039] like Figure 2 , Figure 5 As shown, the main components inside the load switch cabinet 3 are the load switch 3.2, including the third conductive component 3.1, the second supporting insulator 3.3, the third connecting copper busbar 3.4, and the third sealing sleeve 3.5.

[0040] The connection relationships between the components in the above cabinets are existing technologies.

[0041] like Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, in the DVC scheme of the gas-insulated ring network switchgear, the primary components of the cable lifting cabinet 1, circuit breaker cabinet 2, and load switch cabinet 3 are all installed in the same gas box (i.e., integrated gas box 5). The operating mechanisms of the circuit breaker cabinet 2 and the load switch cabinet 3 are located at the front of their respective cabinets, that is, in front of the gas box.

[0042] like Figures 6-9As shown, the integrated gas box 5 has a convex shape. This convex structure not only accommodates the arrangement of components inside the gas box but also saves space and facilitates the layout of the switchgear control room 4. All the sealing sleeves, namely the first sealing sleeve 1.5, the second sealing sleeve 2.5, and the third sealing sleeve 3.5, have the same height, which facilitates the external cable connection of the switchgear. This design satisfies the functional requirements of each cabinet while minimizing the gas box volume, lowering the center of gravity, and ensuring structural stability, making it less prone to tipping and damage during the installation and transportation of the switchgear.

[0043] For ease of component installation and subsequent maintenance, such as Figure 7 As shown, the integrated gas box 5 has a circuit breaker mounting hole 5.3 on its front side; as Figure 6 As shown, the back of the integrated gas box 5 has component mounting holes 5.1 for other components. The integrated gas box 5 contains a first reinforcing beam 5.2 and a second reinforcing beam 5.4. The first reinforcing beam 5.2, which does not interfere with the components, is welded to the integrated gas box 5 as a whole. The second reinforcing beam 5.4, which interferes with the components, is connected to the integrated gas box 5 as a whole by welding nuts, bolts, etc., ensuring the smooth installation of the circuit breaker 2.3, load switch 3.2, disconnector 2.2, first conductive component 1.1, first connecting copper busbar 1.2, first supporting insulator 1.3, second connecting copper busbar 1.4, first sealing sleeve 1.5, second conductive component 2.1, second sealing sleeve 2.5, third conductive component 3.1, second supporting insulator 3.3, third connecting copper busbar 3.4, and third sealing sleeve 3.5. All the reinforcing beams serve to prevent deformation of the gas box and to support the installation of primary components.

[0044] like Figure 10 , Figure 11 As shown, a removable rear cover plate 6 is provided on the component mounting hole 5.1 of the integrated air box 5 to ensure the reliability of the air box seal. The rear cover plate 6 is a stainless steel plate formed by one-time cold pressing (with good tensile properties, rust prevention, and the same material as the air box 5). It is provided with a molded protruding sealing ring groove 6.2 and a molded I-shaped reinforcing rib 6.1 (which serves to strengthen and prevent air leakage due to stretching). The groove of the sealing ring groove 6.2 is located on the inner plate surface of the rear cover plate 6, and a sealing ring is set in the sealing ring groove 6.2. A third reinforcing beam 6.3 is welded on the outer plate surface of the rear cover plate 6. The cross-section of the third reinforcing beam 6.3 is Π-shaped. The middle part of the reinforcing rib 6.1 is located inside the third reinforcing beam 6.3, and the two ends of the third reinforcing beam 6.3 extend to the two side edges of the rear cover plate 6 to ensure the installation of the sealing ring and the strength of the rear cover plate 6.

[0045] Because the air box is inflated, the back cover plate itself (including the reinforcing ribs and sealing ring groove) which is pressed in one piece must have good sealing performance. That is, the back cover plate itself, especially the tensile reinforcing ribs and sealing groove, must not have any air leakage points. Then, the sealing ring is placed in the sealing ring groove, and the sealing ring is pressed tightly during installation. The air box can be guaranteed to be sealed and will not leak.

[0046] After the components inside the integrated air box 5 are installed and checked to be correct, the rear cover plate 6 is installed, thus completing the assembly of the integrated air box 5. In special cases, if it is necessary to open the air box 5, the rear cover plate 6 can be removed to perform internal inspection and component replacement of the integrated air box 5.

[0047] Example 2

[0048] like Figure 12 , Figure 13 As shown, the difference between this embodiment and embodiment 1 is that the gas-insulated ring network switchgear consists of two load switch cabinets 3 and one circuit breaker cabinet 2, with the circuit breaker cabinet 2 in the center, i.e., the CVC scheme is adopted.

[0049] In other embodiments, the positions of the cable lifting cabinet 1 and the load switch cabinet 3 in Embodiment 1 can be interchanged, that is, the load switch cabinet 3 is located on the left, the cable lifting cabinet 1 is located on the right, and the circuit breaker cabinet 2 is in the middle. This is the CVD scheme.

[0050] The convex-shaped structure of the integrated gas box is symmetrical from left to right. Without changing the external dimensions of the gas box or the welded reinforcing beams, by rationally selecting components and changing the non-welded reinforcing beams, the number of gas-insulated ring network switchgear options can be increased, which can further expand the application range of the gas box and facilitate the standardized production of the gas box.

Claims

1. A gas insulated ring main unit switchgear, characterized by: It is composed of at least a circuit breaker cabinet, a load switch cabinet and a control room, the load switch cabinet and the circuit breaker cabinet are arranged side by side, the gas tank of the load switch cabinet and the circuit breaker cabinet is an integrated gas tank, the integrated gas tank is a convex shape, wherein the gas tank of the circuit breaker cabinet is the middle box space of the integrated gas tank, the gas tank of the load switch cabinet is at least one side box space of the integrated gas tank, and the control room is located on both sides of the circuit breaker cabinet.

2. The gas insulated ring main unit switchgear according to claim 1, characterized in that: The load switch cabinet is a pair and arranged side by side on both sides of the circuit breaker cabinet, and the gas tanks of the two load switch cabinets are the two side box spaces of the integrated gas tank respectively.

3. The gas insulated ring main unit switchgear according to claim 1, characterized in that: The gas insulated ring network switchgear includes a cable lifting cabinet, the cable lifting cabinet and the load switch cabinet are arranged side by side on both sides of the circuit breaker cabinet, and the gas tanks of the cable lifting cabinet and the load switch cabinet are the two side box spaces of the integrated gas tank respectively.

4. The gas insulated ring main unit switchgear according to claim 2 or 3, characterized in that: A first reinforcing beam that does not interfere with the installation of components and a second reinforcing beam that interferes with the installation of components are arranged in the integrated gas tank, the first reinforcing beam is welded with the integrated gas tank as a whole, and the second reinforcing beam is connected with the integrated gas tank as a whole through a detachable structure.

5. The gas insulated ring main unit switchgear according to claim 4, characterized in that: A circuit breaker mounting hole for mounting a circuit breaker is opened on the front of the integrated gas tank, a component mounting hole for mounting other components is opened on the back of the integrated gas tank, a detachable back cover plate is arranged on the component mounting hole, the back cover plate is a one-time cold-pressed stainless steel plate, a protruding sealing ring groove and an I-shaped reinforcing rib are pressed on the back cover plate, the groove opening of the sealing ring groove is located on the inner plate surface of the back cover plate, a sealing ring is arranged in the sealing ring groove, a third reinforcing beam with a Π-shaped cross section is welded on the outer plate surface of the back cover plate, the middle part of the reinforcing rib is located inside the third reinforcing beam, and the two ends of the third reinforcing beam extend to the two side edges of the back cover plate.

6. The gas insulated ring main unit switchgear according to claim 5, characterized in that: The heights of all sealing sleeves in the integrated gas tank are consistent.

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