Shielding can and GIS circuit breaker

Abstract

The utility model relates to a shielding case and GIS circuit breaker, shielding case includes: intermediate cover body and two outer expansion end parts, two outer expansion end parts are connected in the both sides of intermediate cover body respectively, and the outer expansion end part includes the outer expansion section that extends from the intermediate cover body to the direction of away from the intermediate cover body gradually, the inner shrink section that extends from the outer expansion section to the direction of away from the intermediate cover body gradually and the close section that extends from the inner shrink section to the direction of close to the intermediate cover body, the outer expansion end part of the shielding case of the application first expands outward, then shrinks inward, makes the size of intermediate cover body less than the size of outer expansion end part, increases the assembly size of end part, and the cost is reduced compared with the shielding case that the whole is big. The outer expansion section and the inner shrink section can bear the potential difference between the GIS shell (grounding), and the close section can bear the potential difference between the capacitor (set potential).

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, and in particular to a shielding cover and a GIS circuit breaker. Background Technology

[0002] With the development of power systems, a highly integrated type of electrical equipment has emerged in high-voltage power distribution devices: GIS (SF6 gas-insulated metal-enclosed switchgear). GIS is highly adaptable, covers a wide voltage range, and is mainly used in high-voltage power distribution systems in substations. It is a crucial piece of equipment for ensuring the safe operation of the power system. To meet insulation level requirements, high-voltage GIS typically includes a shielding enclosure. This enclosure shields high-potential, non-smooth, irregularly shaped components and is used to bear the potential difference between the GIS enclosure and the grounding point. Furthermore, some shielding enclosures need to bear a bidirectional potential difference: one direction is the potential difference between the GIS enclosure and the grounding point, and the other is the potential difference between the enclosure and the capacitor (set potential).

[0003] Currently, GIS equipment with voltage levels of 550kV and above typically requires large shielding covers due to insulation level and breaking capacity requirements. The quality of the shielding cover design directly affects the cost and reliability of the GIS. Utility Model Content

[0004] Based on this, in order to meet the current requirements for insulation level and breaking capacity of high-voltage GIS, a shielding cover and a GIS circuit breaker are provided.

[0005] On the one hand, this application provides a shielding cover, comprising:

[0006] Intermediate cover; and

[0007] Two outwardly expanding ends are respectively connected to both sides of the intermediate cover. Each outwardly expanding end includes an outwardly expanding section that gradually expands from the intermediate cover in a direction away from the intermediate cover, an inwardly contracting section that gradually contracts from the outwardly expanding section in a direction away from the intermediate cover, and a closing section that extends from the inwardly contracting section in a direction close to the intermediate cover.

[0008] In one embodiment, the outward expansion section includes a plurality of outward expansion segments connected in sequence, and the plurality of outward expansion segments are arc-shaped structures that are sequentially tangent in cross-section along the axial direction of the intermediate cover.

[0009] In one embodiment, the recessed section includes a plurality of recessed segments connected in sequence, and the plurality of recessed segments are arc-shaped structures that are sequentially tangent in cross-section along the axial direction of the intermediate cover.

[0010] In one embodiment, the arc radius of the plurality of inward segments decreases sequentially in the order of being closer to the outward segment and further away from the outward segment.

[0011] In one embodiment, the closing section includes a plurality of closing segments connected in sequence, and the closing segment located at the end of the closing section has an outwardly extending arc-shaped structure in cross-section along the axial direction of the intermediate cover.

[0012] In one embodiment, the arc angle of the closing segment located at the end of the closing segment is greater than 60°.

[0013] In one embodiment, the shield has a plurality of inwardly recessed stress relief grooves, which are respectively arranged around the intermediate shield, and the edges of the stress relief grooves have rounded chamfers.

[0014] In one embodiment, the shielding cover has a plurality of inwardly recessed bolt shielding pits disposed in the intermediate cover, and the edges of the bolt shielding pits have rounded chamfers.

[0015] In one embodiment, the two outwardly flared ends are integrally connected to the intermediate cover.

[0016] In one embodiment, the two extended ends are respectively welded to the intermediate cover, and the weld between the extended ends and the intermediate cover is located in the stress relief groove.

[0017] On the other hand, this application also provides a GIS circuit breaker, comprising: a shield as described in any of the above; and a circuit breaker body disposed within the shield.

[0018] In summary, the outer end of the shielding cover in this application first expands outward and then contracts inward, making the size of the middle cover smaller than the size of the outer end, increasing the assembleable size of the end, and reducing costs compared to a shielding cover that is larger overall. The outer and inner sections can withstand the potential difference (grounding) between the shielding cover and the GIS shell, while the constricted section can withstand the potential difference (set potential) between the shielding cover and the capacitor. Attached Figure Description

[0019] Figure 1 A perspective view of a shielding cover provided for one embodiment of this application;

[0020] Figure 2 A cross-sectional schematic diagram of a shielding cover according to the above embodiments of this application is shown;

[0021] Figure 3 As shown Figure 2 A magnified schematic diagram of part A of the shielding cover shown;

[0022] Figure 4 As shown Figure 2A magnified schematic diagram of part B of the shielding cover shown;

[0023] Figure 5 A schematic diagram of the potential difference when the shielding cover according to the above embodiments of this application is installed on a GIS circuit breaker is shown.

[0024] Reference numerals: 10, intermediate cover; 20, outward expansion end; 21, outward expansion section; 211, outward expansion segment; 22, inward contraction section; 221, inward contraction segment; 23, closing section; 231, closing segment; 30, stress relief groove; 40, bolt shielding pit. Detailed Implementation

[0025] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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, and are not intended to 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 of this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0031] Based on this, in order to meet the current requirements for insulation level and breaking capacity of high-voltage GIS, this application provides a shielding cover with excellent performance that can be used in high-voltage GIS.

[0032] Specifically, please refer to Figure 1 and Figure 2 The shield may include an intermediate cover 10 and two outwardly expanding ends 20, which are respectively connected to both sides of the intermediate cover 10. The outwardly expanding ends 20 may include an outwardly expanding section 21, an inwardly contracting section 22, and a constricting section 23. The outwardly expanding section 21 extends gradually from the intermediate cover 10 away from the intermediate cover 10, the inwardly contracting section 22 extends gradually from the outwardly expanding section 21 away from the intermediate cover 10, and the constricting section 23 extends from the inwardly contracting section 22 towards the intermediate cover 10.

[0033] It is understandable that the outwardly expanding end 20 of the shielding cover in this application first expands outward and then contracts inward, making the size of the intermediate cover 10 smaller than the size of the outwardly expanding end 20, thereby increasing the assembleable size of the end and reducing costs compared to a shielding cover that is larger overall. Figure 3 As shown, the outward expansion section 21 and the inward contraction section 22 can withstand the potential difference between the GIS shell and the ground, while the contraction section 23 can withstand the potential difference between the capacitor (set potential).

[0034] Because sharp edges can create localized strong electric fields, affecting the insulation performance of the shield, in some embodiments, the intermediate cover 10 and the outwardly extending end 20 of the shield of this application are both circular in cross-section perpendicular to the axis of the intermediate cover 10. This eliminates sharp edges in the circumferential direction of the intermediate cover 10 and the outwardly extending end 20, achieving a uniform electric field distribution, avoiding the formation of localized strong electric fields, and improving the insulation performance of the shield.

[0035] For example, the maximum diameter of the shielding cover in this application is typically greater than 400 mm, and the length is typically greater than 900 mm.

[0036] Furthermore, such as Figure 3 As shown, in some embodiments, the outward expansion section 21 includes a plurality of outward expansion segments 211 connected in sequence, and the plurality of outward expansion segments 211 are successively tangent arc-shaped structures in cross-section along the axial direction of the intermediate cover 10. In other words, the outward expansion section 21 is formed by a plurality of arc-shaped outward expansion segments 211 that are successively tangent and smoothly transitioned, which can avoid the formation of local strong electric fields and improve the insulation performance of the outward expansion section 21.

[0037] It is worth noting that, in one embodiment, among the multiple outward expansion segments 211, the center of the outward expansion segment 211 connected to the intermediate cover 10 is located outside the shield, while the center of the other outward expansion segments 211 is located inside the shield. In this way, the outward expansion segments 211 connected to the intermediate cover 10 can form a smooth transition, so that the size of the outward expansion segment 21 expands smoothly and avoids the formation of a local strong electric field.

[0038] Similarly, as Figure 3 As shown, in some embodiments, the recessed section 22 includes a plurality of recessed segments 221 connected in sequence, and the plurality of recessed segments 221 are arc-shaped structures that are sequentially tangent in cross-section along the axial direction of the intermediate cover 10. In this way, the recessed section 22 is formed by a smooth transition of a plurality of arc-shaped recessed segments 221 that are sequentially tangent, so that the recessed section 22 has better insulation performance.

[0039] Preferably, in some embodiments, the arc radius of the plurality of inwardly tapered segments 221 decreases sequentially from the outerly expanding segment 21 to the outerly expanding segment 21. In this way, by controlling the arc radius of each inwardly tapered segment 221, the inwardly tapered segment 22 can transition the outerly expanding segment 21 to the tapered segment 23 with a shorter length, thereby reducing the overall length of the outerly expanding end 20.

[0040] Optionally, in some embodiments, the outward expansion segment 21 may include 2 to 3 outward expansion segments 211, and the inward contraction segment 22 may include 8 to 10 inward contraction segments 221.

[0041] Furthermore, such as Figure 3 As shown, in some embodiments, the tapering section 23 includes a plurality of tapering segments 231 connected in sequence, and the tapering segment 231 located at the end of the tapering section 23 has an outwardly extending arc-shaped structure in cross-section along the axial direction of the intermediate cover 10. In this way, the end of the tapering section 23 is far away from the high-voltage components of the GIS inside the shielding cover, so as to avoid the sharp edge structure at the end of the tapering section 23 disturbing the electric field, causing a sharp increase in local electric field intensity, and triggering discharge problems.

[0042] Preferably, in some embodiments, the arc angle of the tapering segment 231 located at the end of the tapering segment 23 is greater than 60°. This ensures that the end of the tapering segment 23 is far away from the high-voltage components of the GIS inside the shielding cover, maintaining a uniform and stable electric field distribution within the shielding cover.

[0043] Specifically, to prevent the sharp edge structure of the tapered section 23 from deteriorating the electric field, the end of the tapered section 23 has a rounded chamfer. This rounded chamfer eliminates the sharp edge of the tapered section 23, resulting in a better electric field within the shield. This rounded chamfer can be formed by grinding the sharp edge at the end of the tapered section 23.

[0044] To enhance the structural strength of the shielding cover, such as Figure 1 and Figure 2 As shown, in some embodiments, the shielding cover has multiple inwardly recessed stress relief grooves 30, which are respectively arranged around the intermediate cover 10, and the edges of the stress relief grooves 30 have rounded chamfers. In this way, by providing multiple stress relief grooves 30, it is equivalent to adding reinforcing ribs in local positions of the shielding cover, which greatly improves the mechanical strength of the shielding cover.

[0045] For example, the middle cover 10 of the shielding cover of this application may be provided with 2 to 5 stress relief grooves 30. The depth of the stress relief grooves 30 is in the range of 4 mm to 6 mm, the width is in the range of 15 mm to 25 mm, and the radius of the rounded chamfer of its edge is in the range of 10 mm to 15 mm.

[0046] Because the shielding cover needs to be fixed to the GIS by bolts, and some bolts have sharp edges that can easily generate localized strong electric fields, therefore, if Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, in some embodiments, the shielding cover has multiple inwardly recessed bolt shielding pits 40, which are disposed in the intermediate cover 10, and the edges of the bolt shielding pits 40 have rounded chamfers. In this way, by providing multiple bolt shielding pits 40, the bolts can be effectively shielded, thereby improving the insulation performance of the shielding cover.

[0047] For example, such as Figure 4 As shown, the middle cover 10 of the shielding cover of this application may be provided with 4 to 6 bolt shielding pits 40. The depth of the bolt shielding pit 40 is usually greater than the thickness of the head of the connecting bolt. The radius of the rounded chamfer of the edge of the bolt shielding pit 40 is generally in the range of 10mm to 15mm. Round head bolts are usually used for connection.

[0048] Optionally, in some embodiments, the intermediate cover 10 and the outwardly extended ends 20 of the shielding cover of this application can be formed by spinning a 2mm thick aluminum alloy rolled sheet with good ductility. The spun aluminum alloy rolled sheet integrally forms the intermediate cover 10 and the outwardly extended ends 20. In this way, the two outwardly extended ends 20 are integrally connected to the intermediate cover 10, and there are no structural gaps between the outwardly extended ends 20 and the intermediate cover 10, resulting in high insulation performance. Alternatively, the outwardly extended ends 20 and the intermediate cover 10 can be spun separately, and then the two outwardly extended ends 20 are welded to the intermediate cover 10 respectively. The weld between the outwardly extended ends 20 and the intermediate cover 10 is set in a stress relief groove 30. In this way, the stress relief groove 30 shields the weld, thereby improving the insulation performance of the shielding cover.

[0049] Furthermore, this application also provides a GIS circuit breaker, which may include a shielding cover and a circuit breaker body as described above, with the circuit breaker body disposed within the shielding cover. This GIS circuit breaker can provide critical protection and control for the power system, thereby ensuring the safe, stable, and efficient operation of the power system. In addition, by providing a shielding cover outside the circuit breaker body, the GIS circuit breaker can utilize the shielding cover to protect the circuit breaker body, ensuring the safe isolation of the circuit breaker body.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A shield characterized by, include: Intermediate cover; and Two outwardly expanding ends are respectively connected to both sides of the intermediate cover. Each outwardly expanding end includes an outwardly expanding section that gradually expands from the intermediate cover in a direction away from the intermediate cover, an inwardly contracting section that gradually contracts from the outwardly expanding section in a direction away from the intermediate cover, and a closing section that extends from the inwardly contracting section in a direction close to the intermediate cover.

2. The shield of claim 1, wherein The outward expansion section includes multiple outward expansion segments connected in sequence, and the multiple outward expansion segments are sequentially tangent arc-shaped structures in cross-section along the axial direction of the intermediate cover.

3. The shielding cover according to claim 1, characterized in that, The recessed section includes multiple recessed segments connected in sequence, and the multiple recessed segments are arc-shaped structures that are tangent to each other in cross-section along the axial direction of the intermediate cover.

4. The shielding cover according to claim 3, characterized in that, The arc radius of the multiple inward segments decreases sequentially from the outermost segment to the outermost segment.

5. The shielding cover according to claim 1, characterized in that, The closing section includes multiple closing segments connected in sequence, and the closing segment at the end of the closing section has an outwardly extending arc-shaped structure in the cross-section along the axial direction of the intermediate cover.

6. The shielding cover according to claim 5, characterized in that, The arc angle of the closing segment located at the end of the closing segment is greater than 60°.

7. The shielding cover according to any one of claims 1 to 6, characterized in that, The shield also includes a plurality of inwardly recessed stress relief grooves, which are respectively arranged around the intermediate cover, and the edges of the stress relief grooves have rounded chamfers.

8. The shielding cover according to any one of claims 1 to 6, characterized in that, The shielding cover also includes a plurality of inwardly recessed bolt shielding pits, which are disposed in the intermediate cover body and have rounded chamfers at their edges.

9. The shielding cover according to any one of claims 1 to 6, characterized in that, The two outwardly flared ends are integrally connected to the intermediate cover.

10. The shielding cover according to claim 7, characterized in that, The two extended ends are respectively welded to the intermediate cover, and the weld between the extended ends and the intermediate cover is located in the stress relief groove.

11. A GIS circuit breaker, characterized in that, include: The shielding cover as described in any one of claims 1 to 10; and The circuit breaker body is housed within the shielding cover.

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