An arc-shaped valve for a retractable metal-enclosed switchgear

Abstract

This utility model discloses an arc-shaped valve for a removable metal-enclosed switchgear, comprising a stationary contact inside a contact box, and an upper valve and a lower valve installed on the left side of a sheet metal wall, the positions of which correspond to the contact box. Insulating elements for improving electrical clearance are formed on the surfaces of both the upper and lower valves. The curvature variation of the elliptical surface alters the distribution of electric field lines. The arched structure causes the electric field lines to extend along the curved surface, increasing the actual electric field path length, which is equivalent to providing stronger insulation for the same straight-line distance. By optimizing the electric field distribution, a more compact electrical clearance design is indirectly allowed. The distance L1 between the valve and the stationary contact determines the insulation level of the device. The distance L2 plus L1 further increases the electrical clearance from the valve to the stationary contact, effectively increasing the distance between high voltage and ground, thus improving electrical performance and solving the problem of failing lightning impulse tests due to insufficient electrical clearance.

Description

Technical Field

[0001] This utility model belongs to the field of switch cabinet data acquisition technology, specifically relating to an arc-shaped door for a removable metal-enclosed switchgear. Background Technology

[0002] Because my country's power grid voltage level is mostly 12kV, while foreign countries mostly use 17.5kV, there are significant differences in parameters. Domestically, 24kV products have been widely used as a substitute. With market expansion and increasingly fierce competition, cost has become a more prominent factor in pricing. The excessive margin in 24kV products has prevented cost reduction. Analysis shows that the insulation structure of the product has a significant impact on its dimensions, thus affecting the overall cost. The power frequency withstand voltage requirement for 17.5kV is lower than that of domestic 12kV products, so 12kV products can be used as a substitute. However, the lightning impulse voltage is 95kV, higher than the domestic 75kV, which necessitates an increase in the live distance within the cabinet.

[0003] In the existing scheme, when the valve is closed during maintenance, the air distance between the metal valve and the high-voltage stationary contact is small, i.e., the electrical clearance, which makes it difficult to ensure the safety of equipment and personnel when the system encounters lightning overvoltage. Utility Model Content

[0004] The purpose of this invention is to provide a removable metal-enclosed switchgear with an arc-shaped valve to solve the problems of electrical clearance and safety protection in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A removable metal-enclosed switchgear with an arc-shaped valve includes an inner wall of a housing. A sheet metal wall is fixed within the inner wall. Several contact boxes are installed on the right side of the sheet metal wall, each containing a stationary contact. An upper valve and a lower valve are installed on the left side of the sheet metal wall, their positions corresponding to the contact boxes. Insulating elements for increasing electrical clearance are formed on the surfaces of both the upper and lower valves.

[0006] Preferably, the inner wall of the box is supported by support columns on the top and bottom, and the upper and lower doors are slidably connected to the support columns.

[0007] Preferably, the upper and lower valves are provided with connecting ears at both ends, and the connecting ears have a positioning groove passing through them. The connecting ears slide and engage with the support column through the positioning groove.

[0008] Preferably, the insulating element includes an arc surface, and the main viewing surface of the arc surface is elliptical.

[0009] Preferably, the side of the arc surface away from the contact box is arched to form an air gap.

[0010] Preferably, the length from the stationary contact to one side of the upper and lower valves is represented by L1, and the length from one side of the upper and lower valves to the highest point of the arc surface is represented by L2.

[0011] The technical solution of this utility model has the following beneficial effects: 1. The curvature of an elliptical surface can alter the distribution of electric field lines. An arched structure extends the electric field lines along the surface, increasing the actual electric field path length, which is equivalent to providing stronger insulation over the same straight-line distance. This design, by optimizing the electric field distribution, indirectly allows for more compact electrical clearance designs. In scenarios where internal space is limited, the elliptical arched structure can reduce the planar footprint through a three-dimensional layout while maintaining necessary electrical clearance.

[0012] 2. The distance L1 between the valve and the stationary contact determines the insulation level of the equipment. The distance L2 plus L1 further increases the electrical clearance between the valve and the stationary contact, effectively increasing the distance between the high voltage and ground, thus improving electrical performance. This can effectively solve the problem of failing the lightning impulse test due to insufficient electrical clearance. At the same time, it improves the overall insulation effect of the equipment. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a partially exploded view of the present invention.

[0016] Figure 3 This is a top view of the entire utility model.

[0017] Figure 4 This is a cross-sectional view of the valve installation of this utility model.

[0018] Figure 5 This is a schematic diagram of the valve structure of this utility model.

[0019] Figure 6 This is a cross-sectional schematic diagram of the valve of this utility model.

[0020] Reference numerals: 10, sheet metal wall; 20, contact box; 201, stationary contact; 30, upper valve; 301, lower valve; 302, connecting ear; 303, positioning groove; 304, curved surface; 305, air gap; 40, support column; 401, inner wall of the box. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0022] Example 1: refer to Figure 1 A removable metal-enclosed switchgear arc-shaped valve includes an inner wall 401, which is inside the switchgear enclosure. A sheet metal wall 10 is fixed inside the inner wall 401, and several contact boxes 20 are installed on the right side of the sheet metal wall 10. The contact boxes 20 are used to cooperate with a removable vacuum circuit breaker inside the switchgear enclosure. The contacts of the removable vacuum circuit breaker are moved and inserted into the contact box 20 to achieve closing. The removable vacuum circuit breaker will not be described in detail here. refer to Figures 1-4 An upper valve 30 and a lower valve 301 are installed on the left side of the sheet metal wall 10, and the positions of the upper valve 30 and the lower valve 301 correspond to those of the contact box 20. In the above scheme, the contacts inside the contact box 20 are energized and are critical connection points for high voltage or high current. The valves serve as isolation and protection. When the valves correspond to the positions of the contact box 20, they are in the closed state before the normal closing operation of the equipment. That is, the positions of the upper valve 30 and the lower valve 301 correspond to the contact box 20, which can effectively prevent personnel from accidentally contacting the energized parts inside the contact box 20, greatly reducing the probability of electric shock accidents and ensuring the safety of operators and personnel around the equipment. At the same time, an electric arc may be generated at the moment of opening and closing operations. The valves can confine the arc inside the contact box 20, preventing the arc from causing damage to surrounding equipment and personnel.

[0023] Among them, reference Figure 1 and Figure 5 The inner wall 401 of the box is supported by support columns 40 on the top and bottom, and the upper valve 30 and the lower valve 301 are slidably connected to the support columns 40. The upper valve 30 and the lower valve 301 are provided with connecting ears 302 at both ends. The connecting ears 302 have a positioning groove 303 passing through them. The connecting ears 302 slide on the support column 40 through the positioning groove 303.

[0024] In the above scheme, the connecting ear 302 passes through the positioning groove 303 onto the support column 40, thereby allowing for sliding engagement and facilitating the movement of the upper valve 30 and the lower valve 301. The adjustment directions of the upper valve 30 and the lower valve 301 are upward and downward, respectively (see reference). Figure 1(In the direction of the middle arrow). It should be noted that when the withdrawable vacuum circuit breaker is open, the valve and contact box 20 are in the same position; conversely, when the withdrawable vacuum circuit breaker is closed, the upper valve 30 and lower valve 301 need to be moved upwards and downwards respectively. This upward and downward movement of the upper and lower valves 301 requires control through other linkage mechanisms. These linkage mechanisms are not described in detail, and are not shown in the diagram. The support column 40 in the diagram is a virtual line, used to facilitate the description of the movement direction of the upper and lower valves 301.

[0025] refer to Figures 4-6 Both the upper valve 30 and the lower valve 301 have insulating elements formed on their surfaces to improve electrical clearance; The insulating component includes an arc surface 304, the main view of which is elliptical, and the side of the arc surface 304 away from the contact box 20 is arched to form an air gap 305. In the above scheme, the curvature variation of the elliptical surface alters the distribution of electric field lines. The arched structure extends the electric field lines along the curved surface, increasing the actual electric field path length, which is equivalent to providing stronger insulation over the same straight-line distance. This design, by optimizing the electric field distribution, indirectly allows for a more compact electrical clearance design. In scenarios where internal space is limited, the elliptical arched structure can reduce the planar footprint through a three-dimensional layout while maintaining necessary electrical clearance. The extended electrical clearance distance occurs within the 305mm air gap range.

[0026] For details, please refer to Figure 4 The contact box 20 contains a stationary contact 201. The length from the stationary contact 201 to one side of the upper valve 30 and the lower valve 301 is represented by L1. The length from one side of the upper valve 30 and the lower valve 301 to the highest point of the arc surface 304 is represented by L2.

[0027] In this scheme, the distance L1 between the valve and the stationary contact 201 determines the insulation level of the equipment. The distance L2 plus L1 further increases the electrical clearance between the valve and the stationary contact 201, effectively increasing the distance between the high voltage and the ground, thus improving electrical performance. This can effectively solve the problem of failing the lightning impulse test due to insufficient electrical clearance. It also improves the overall insulation effect of the equipment. (The value R = L1 + L2, where L1 is the shortest distance from the ordinary valve to the stationary contact 201, and L2 is the distance from the curved valve to the stationary contact 201. Obviously, R is greater than L1, exceeding L2 by more than L1. Furthermore, the curved valve can uniformly distribute the electric field between the two, resulting in better voltage withstand strength.)

[0028] The specific implementation process of this utility model is as follows: The curvature of an elliptical surface can alter the distribution of electric field lines. An arched structure extends the electric field lines along the surface, increasing the actual electric field path length, which is equivalent to providing stronger insulation over the same straight-line distance. This design, by optimizing the electric field distribution, indirectly allows for more compact electrical clearance designs. In scenarios where internal space is limited, the elliptical arched structure can reduce the planar footprint through a three-dimensional layout while maintaining necessary electrical clearance.

[0029] The distance L1 between the valve and the stationary contact 201 determines the insulation level of the equipment. The distance L2 plus L1 further increases the electrical clearance between the valve and the stationary contact 201, effectively increasing the distance of high voltage to ground and improving electrical performance. This can better solve the problem of failing the lightning impulse test due to insufficient electrical clearance.

[0030] The above embodiments are merely exemplary models of this utility model and are not intended to limit this utility model. The scope of protection of this utility model is defined by the claims. Various modifications or equivalent substitutions can be made to this utility model within its substance and scope of protection. Such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this utility model.

[0031] In the description of this utility model, it should be noted that the terms "inner," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the attached circle, or the orientation or positional relationship commonly used when the utility model product is in use. They are used only for the convenience of describing this utility model 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, these terms indicating orientation or positional relationship should not be construed as limitations on this utility model.

[0032] In the description of this utility model, it should be further noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, these terms can refer to a fixed connection, a detachable connection, or an integral connection between components; they can also refer to a mechanical connection or an electrical connection; or they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

Claims

1. A removable metal-enclosed switchgear with an arc-shaped door, comprising an inner wall (401) of a housing, wherein a sheet metal wall (10) is fixed inside the inner wall (401), and a plurality of contact boxes (20) are installed on the right side of the sheet metal wall (10), wherein the contact boxes (20) contain stationary contacts (201), characterized in that: An upper valve (30) and a lower valve (301) are installed on the left side of the sheet metal wall (10), and the positions of the upper valve (30) and the lower valve (301) correspond to the contact box (20); The surfaces of the upper valve (30) and the lower valve (301) are both formed with insulating elements for improving electrical clearance, the insulating elements including an arc surface (304).

2. The arc-shaped valve for a retractable metal-enclosed switchgear according to claim 1, characterized in that: The inner wall (401) of the box is supported by support columns (40) on the top and bottom, and the upper valve (30) and the lower valve (301) are slidably connected to the support columns (40).

3. The arc-shaped valve for a retractable metal-enclosed switchgear according to claim 2, characterized in that: The upper valve (30) and the lower valve (301) are provided with connecting ears (302) at both ends. The connecting ears (302) have a positioning groove (303) passing through them. The connecting ears (302) slide on the support column (40) through the positioning groove (303).

4. The arc-shaped valve for a retractable metal-enclosed switchgear according to claim 1, characterized in that: The main view of the arc surface (304) is elliptical.

5. The arc-shaped valve for a retractable metal-enclosed switchgear according to claim 4, characterized in that: The side of the arc surface (304) away from the contact box (20) is arched to form an air gap (305).

6. The arc-shaped valve for a retractable metal-enclosed switchgear according to claim 5, characterized in that: The length from the stationary contact (201) to one side of the upper valve (30) and the lower valve (301) is represented by L1, and the length from one side of the upper valve (30) and the lower valve (301) to the highest point of the arc surface (304) is represented by L2.

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