A connecting structure of an inner cone sleeve pipe and an insulating bus adapter for an air chamber

Abstract

The application discloses a connecting structure of an inner cone sleeve pipe and an insulating bus adapter for an inflation cabinet, which is characterized by comprising an insulating bus adapter body, wherein the insulating bus adapter body is connected with the inner cone sleeve pipe, and a connecting surface of epoxy material is arranged at the connecting position; a conductive body structure is arranged in the middle of the insulating bus adapter body, and an epoxy insulating layer is wrapped outside the conductive body structure; a metal mounting structure for mounting a flange is arranged outside the epoxy insulating layer; an insulating bus bushing is arranged on the outer circumferential surface of the metal mounting structure; an insulating bus flange is arranged on the outer periphery of the insulating bus bushing; one end of an insulating bus soft insulating body is sleeved on the outer conical surface of the inner cone sleeve pipe, and the other end is attached to the outer conical surface of the hard insulating body of the insulating bus adapter body, so as to fill the gap between the inner cone sleeve pipe and the insulating bus adapter body; and a conductive contact head with a conductive contact finger is arranged at the end of the conductive body.

Description

Technical Field

[0001] This invention relates to the field of manufacturing gas-insulated metal-enclosed switchgear, specifically to a connection structure between an inner conical sleeve and an insulated busbar adapter for a gas-filled switchgear. Background Technology

[0002] With the rapid development of medium-voltage power distribution equipment towards miniaturization, integration, high reliability, and environmental friendliness, gas-insulated switchgear, with its advantages of compact structure, excellent insulation performance, and strong environmental adaptability, has been widely used in urban power distribution networks, rail transit, industrial and commercial power distribution, and new energy booster stations. The inner conical sleeve, as the core insulating plug-in component of the gas-insulated switchgear chamber, plays a crucial role in busbar conductive connection, insulation isolation, and chamber sealing. Its docking structure with the busbar directly determines the cabinet's insulation performance, electric field distribution, contact temperature rise, and overall operational reliability. However, traditional docking structures suffer from poor positioning accuracy and difficulty in controlling busbar coaxiality, easily leading to loose contact, misalignment, and incomplete connections, resulting in high contact resistance and excessive temperature rise under high current conditions, posing potential power supply safety hazards. Furthermore, the difficulty in controlling coaxiality in direct plug-in structures easily creates tiny gaps in the plug-in position, reducing cabinet insulation and significantly increasing subsequent operation and maintenance costs. Therefore, providing a structurally sound, highly adaptable, well-insulated, and reliably assembled insulated busbar adapter to address the aforementioned shortcomings of existing technologies is a problem that needs to be solved.

[0003] To address the inconvenience of installing the insulated busbar body and the through-core CT in the busbar incoming line scheme of gas-insulated switchgear, this invention optimizes the electric field distribution in the inner cone insertion area, standardizes the busbar docking interface, and improves the sealing insulation performance and assembly accuracy by setting an insulated busbar adaptation transition structure. This solves the technical problems of electric field concentration, poor adaptability, poor sealing, high temperature rise, and low reliability in traditional structures, and achieves safe, stable, universal, and maintenance-free busbar connection for gas-insulated switchgear. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the purpose of this invention is to provide a connection structure between the inner conical sleeve and the insulated bus adapter for a gas-filled switchgear.

[0005] To achieve the objectives of this invention, the technical solution adopted is as follows:

[0006] A connection structure between an inner conical sleeve and an insulated busbar adapter for a gas-insulated switchgear includes:

[0007] An insulated busbar adapter body is connected to the inner conical sleeve, and an epoxy material connection surface is provided at the connection point.

[0008] The insulated bus adapter body has a conductive structure in the middle, and the conductive structure is wrapped with an epoxy insulation layer.

[0009] A metal mounting structure for mounting flanges is provided outside the epoxy insulation layer;

[0010] The metal mounting structure is tightly fitted onto the outer periphery of the insulated bus adapter body near the end of the insulated bus.

[0011] An insulating busbar bushing is provided on the outer peripheral surface of the metal mounting structure;

[0012] An insulating busbar flange is provided on the outer periphery of the insulating busbar bushing.

[0013] One end of a soft insulator of an insulated busbar is fitted onto the outer conical surface of the inner conical sleeve, and the other end is attached to the outer conical surface of the hard insulator of the insulated busbar adapter body to fill the gap between the inner conical sleeve and the insulated busbar adapter body.

[0014] The conductor is provided with a conductive contact with conductive fingers at its end.

[0015] The metal mounting structure is a cylindrical metal mounting structure.

[0016] An annular inner groove is formed along the axial direction on the outer peripheral surface of the cylindrical metal mounting structure, and an insulating busbar bushing is provided in the annular inner groove.

[0017] The insulating busbar bushing has a semi-cylindrical structure. An insulating busbar flange is provided on the outer periphery of the insulating busbar bushing through an annular step. An annular step is provided on the inner ring of the insulating busbar flange, which cooperates with the outer ring step of the insulating busbar bushing. The step nesting structure realizes the detachable connection with the bushing.

[0018] The soft insulator of the insulated busbar is an insulated busbar rubber sleeve, preferably an insulated busbar silicone rubber sleeve.

[0019] One end of the conductive contact is electrically connected to a conductor inside the insulated busbar adapter body via a fastening bolt.

[0020] The conductive finger has a heat dissipation hole in the middle and is installed in the finger groove of the conductive contact.

[0021] The insulated busbar and the inner conical sleeve are installed on the gas box.

[0022] The beneficial effects of this invention are as follows:

[0023] This invention features a simple structure and convenient installation, effectively improving the operational stability of medium-voltage gas-insulated switchgear, reducing the failure rate of distribution network equipment, and minimizing economic losses caused by unplanned power outages. Simultaneously, it reduces redundant consumption of insulation materials, lowers the risk of greenhouse gas leakage, and aligns with the development direction of energy conservation, consumption reduction, safety, and environmental protection in power grid equipment. It possesses promising prospects for industrialization and significant socio-economic benefits. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall installation of the present invention.

[0025] Figure 2 This is a schematic diagram of the installation of the insulated busbar adapter of the present invention.

[0026] Figure 3 This is a schematic diagram of the structure of the insulated busbar adapter.

[0027] Figure 4 This is a schematic diagram of the insulated busbar bushing structure.

[0028] Figure 5 This is a schematic diagram of the insulated busbar flange structure.

[0029] Figure 6 This is a schematic diagram of the silicone rubber sleeve structure for an insulated busbar.

[0030] Figure 7 This is a schematic diagram of a conductive contact structure. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention. Furthermore, in the following descriptions, well-known structures and technologies are omitted to avoid unnecessarily obscuring the concept of the invention.

[0032] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. Furthermore, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] like Figures 1 to 7 As shown, the present invention provides a connection structure between an inner conical sleeve and an insulated busbar adapter for a gas-filled switchgear, which mainly includes: an insulated busbar adapter (1), an inner conical sleeve (2), and a gas box (3).

[0034] The insulated bus adapter (1) further includes: an insulated bus adapter body (1.1), an insulated bus bushing (1.2), an insulated bus flange (1.3), an insulated bus silicone rubber sleeve (1.4), a conductive contact (1.5), a contact (1.6), and a fastening bolt (1.7).

[0035] The insulated busbar adapter body (1.1) serves as the core carrier, and its interior is sequentially arranged along the axial direction with a conductor (1.1.1), an end-conical epoxy resin (1.1.2), and a metal cylinder (1.1.3) for mounting flanges. The upper end face of the conductor (1.1.1) is provided with a threaded hole (1.1.1.1) for mounting the conductive contact (1.5) with a fixing bolt (1.7), and the conductor is provided with a heat dissipation hole (1.1.1.1) in the middle, which, after installation, aligns and communicates with the heat dissipation hole (1.5.2) of the conductive contact (1.5) to form an axial heat dissipation channel.

[0036] One end of the insulated bus adapter body (1.1) of the present invention is integrally connected to the inner conical sleeve (2) through the epoxy material connection surface formed by the epoxy casting process, forming a rigid connection section between the inner conical sleeve, the epoxy layer and the insulated bus adapter body.

[0037] A conductor (1.1.1) is embedded inside the body (1.1) of the insulated bus adapter to form a current transmission path.

[0038] A cylindrical metal mounting structure (1.1.3) is coaxially sleeved on the outside of the insulated busbar adapter body (1.1) to support the flange installation. The cylindrical metal mounting structure is fixed in conjunction with the insulated busbar adapter body to ensure axial position stability.

[0039] An annular groove (1.1.3.1) is formed along the axial direction on the outer peripheral surface of the cylindrical metal mounting structure (1.1.3). An insulating busbar bushing (1.2) is provided in the annular groove (1.1.3.1) to achieve radial positioning.

[0040] like Figure 4 As shown, the insulating busbar bushing (1.2) is used in pairs, forming a cylindrical shape when joined together; an annular step (1.2.1) is provided on its outer side; during installation, its inner ring is embedded in the annular groove (1.1.3.1) of the cylindrical metal mounting structure (1.1.3) to achieve radial positioning and prevent the bushing from rotating circumferentially.

[0041] The steps (1.2.1) on the outer ring of the insulating busbar bushing (1.2) are used to support the insulating busbar flange (1.3). The bushing is made of metal and serves as a mechanical support.

[0042] like Figure 5 As shown, an annular step (1.3.1) is provided on the inner side of the insulating busbar flange (1.3).

[0043] During installation, the inner ring step (1.3.1) of the flange and the outer ring step (1.2.1) of the insulating bus bushing (1.2) are nested together to form a detachable connection structure. This detachable structure allows the insulating bus adapter (1) to be easily installed with the through-type current transformer CT (4) after the insulating bus flange (1.3) is removed, thus solving the problem of difficult installation of the external through-type current transformer (4) of the insulating bus adapter (1).

[0044] The other end of the insulated busbar flange (1.3) extends outward to connect to the external insulated busbar, thus completing the extension of the electrical path.

[0045] like Figure 6 As shown, the inner and outer sides of the insulating busbar silicone rubber sleeve (1.4) are both conical structures. The insulating busbar silicone rubber sleeve (1.4) is made of soft silicone rubber, which has both elasticity and insulation properties.

[0046] During installation, one end of the insulating busbar silicone rubber sleeve (1.4) is fitted onto the outer conical surface of the inner conical sleeve (2), and the other end of the insulating busbar silicone rubber sleeve (1.4) is fitted against the outer conical surface of the hard insulating body of the insulating busbar adapter body (1.1) to fill the gap between the inner conical sleeve and the insulating busbar adapter body, solve the problem of busbar connection coaxiality, and achieve insulation sealing and buffering.

[0047] like Figure 7 As shown, the conductive contact (1.5) is made of conductive material and is cylindrical. The upper end face of the conductive contact (1.5) is provided with a mounting hole (1.5.1). It is aligned and fixed with the threaded hole (1.1.1.1) of the conductor (1.1) inside the insulating busbar adapter body (1.1) by fastening bolts (1.7) to achieve electrical connection.

[0048] The conductive contact (1.5) has a heat dissipation hole (1.5.2) in the middle, which, after installation, is connected to the heat dissipation hole (1.1.1.1) of the insulated bus adapter body (1.1) to form a heat dissipation channel.

[0049] The outer surface of the conductive contact (1.5) is provided with a contact finger mounting groove (1.5.3) for mounting the conductive contact finger (1.6).

[0050] The conductive finger (1.6) is placed into the finger mounting groove (1.5.3) of the conductive contact (1.5) to enhance the conductive contact area and realize the current transmission with external conductive components;

[0051] In summary, the connection structure between the inner conical sleeve and the insulated busbar adapter for a gas-insulated switchgear of the present invention adopts a conical surface fitting plug-in + contact current guiding composite structure. The electric field distribution is optimized through integrated stress shielding, effectively suppressing partial discharge. The split plug-in structure facilitates installation and maintenance and can adapt to assembly deviations. The whole structure is fully insulated and fully shielded, and can also easily install through-type current transformers. It is safe and stable in operation, highly versatile, and significantly reduces the cost of equipment manufacturing, on-site construction and subsequent operation and maintenance. It is suitable for various high-voltage power distribution equipment such as gas-insulated switchgear and ring main units.

[0052] The foregoing has shown and described the basic principles and main features of the invention and the advantages of the invention.

[0053] Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A connection structure between an inner conical sleeve and an insulated busbar adapter for a gas-insulated switchgear, characterized in that, include: An insulated busbar adapter body is connected to the inner conical sleeve, and an epoxy material connection surface is provided at the connection point. The insulated bus adapter body has a conductive structure in the middle, and the conductive structure is wrapped with an epoxy insulation layer. A metal mounting structure for mounting flanges is provided outside the epoxy insulation layer; The metal mounting structure is tightly fitted onto the outer periphery of the insulated bus adapter body near the end of the insulated bus. An insulating busbar bushing is provided on the outer peripheral surface of the metal mounting structure; An insulating busbar flange is provided on the outer periphery of the insulating busbar bushing. One end of a soft insulator of an insulated busbar is fitted onto the outer conical surface of the inner conical sleeve, and the other end is attached to the outer conical surface of the hard insulator of the insulated busbar adapter body to fill the gap between the inner conical sleeve and the insulated busbar adapter body. The conductor is provided with a conductive contact with conductive fingers at its end.

2. The connection structure between the inner conical sleeve and the insulated busbar adapter for a gas-insulated switchgear as described in claim 1, characterized in that, The metal mounting structure is a cylindrical metal mounting structure.

3. The connection structure between the inner conical sleeve and the insulated busbar adapter for a gas-insulated switchgear as described in claim 1, characterized in that, The outer peripheral surface of the cylindrical metal mounting structure has an annular inner groove along the axial direction, and an insulating busbar bushing is provided in the annular inner groove.

4. The connection structure between the inner conical sleeve and the insulated busbar adapter for a gas-insulated switchgear as described in claim 1, characterized in that, The insulating busbar bushing has a semi-cylindrical structure. An insulating busbar flange is provided on the outer periphery of the insulating busbar bushing through an annular step. An annular step is provided on the inner ring of the insulating busbar flange, which cooperates with the outer ring step of the insulating busbar bushing. The step nesting structure realizes the detachable connection with the bushing.

5. The connection structure between the inner conical sleeve and the insulated busbar adapter for a gas-insulated switchgear as described in claim 1, characterized in that, The soft insulator of the insulated busbar is an insulated busbar rubber sleeve.

6. The connection structure between the inner conical sleeve and the insulated busbar adapter for a gas-insulated switchgear as described in claim 1, characterized in that, One end of the conductive contact is electrically connected to a conductor inside the insulated busbar adapter body via a fastening bolt.

7. The connection structure between the inner conical sleeve and the insulated busbar adapter for a gas-insulated switchgear as described in claim 1, characterized in that, The conductive finger has a heat dissipation hole in the middle and is installed in the finger groove of the conductive contact. The insulated busbar and the inner conical sleeve are installed on the gas box.

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