Sleeve for metering cabinet

Abstract

A sleeve for a metering cabinet comprises a sleeve assembly and a shielding net placement cavity, the sleeve assembly is inserted in the shielding net placement cavity, and a high-voltage shielding net is arranged in the shielding net placement cavity; the sleeve assembly comprises a cabinet inner pipe fitting and a cabinet outer pipe fitting, the cabinet inner pipe fitting is connected to the periphery of the cabinet outer pipe fitting in a sleeving mode, and umbrella skirts are arranged on the periphery of the cabinet inner pipe fitting or the periphery of the cabinet outer pipe fitting. An electric conductor is arranged in the out-cabinet pipe fitting, and the high-voltage shielding net is embedded between the sleeve assembly and the electric conductor. The annular umbrella skirts are arranged on the outer wall of the sleeve assembly, so that the creep distance between the conductive surfaces at the two ends of the environment-friendly cabinet sleeve conductive piece is increased, and the requirement for the insulation performance of the sleeve is met.

Description

Technical Field

[0001] The utility model relates to the technical field of ring network cabinets, in particular to a casing for a metering cabinet. Background Art

[0002] At present, various ring main units are widely used in distribution stations at all levels in urban and rural areas. Ring main unit bushings are the main components of high-voltage electrical equipment. They are mainly used for the connection between the incoming and outgoing lines of distribution equipment (such as medium-voltage gas-insulated ring main units) and cables. Ring main unit bushings have good conductivity, safety and sealing. Therefore, they are widely used in ring network power supply of urban power grids and power transmission and distribution systems.

[0003] Medium voltage gas insulated ring main unit (hereinafter referred to as ring main unit) is easy to operate, relatively simple to control and protect, and low in cost. It is widely used in secondary power distribution systems and is welcomed by power supply departments and end users. However, most of the current ring main units use sulfur hexafluoride (SFs) gas as the insulation and disconnecting medium. Although SFs gas is an excellent electrical gas, it is also a greenhouse gas with restricted emissions. Therefore, for switchgear, especially for medium voltage switchgear, it is necessary to remove SFs. 6 Chemicalization has important environmental protection significance and has become the development direction.

[0004] Removal of SF from Ring Main Unit 6 Dry air can be used as the insulating medium, but due to SF 6 It is a highly electronegative gas, and its molecules have a strong ability to absorb electrons and have a high resistance to electricity. 6 Gas, dry air has low breakdown electric field strength. Dry air is used as the gas insulation medium. The air gap in the air chamber of the ring main unit and the dielectric strength along the surface of the insulating parts are much lower than that of SF 6 If you want to get the same 6 To achieve the same insulation level of insulated ring main units, it is necessary to optimize the insulation structure design and reduce the maximum electric field strength along the air gap and solid insulation surface. Utility Model Content

[0005] The purpose of the utility model is to provide a bushing for a metering cabinet to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A bushing for a metering cabinet comprises a sleeve assembly and a shielding net placement cavity, wherein the sleeve assembly is plugged into the shielding net placement cavity, and a high-voltage shielding net is arranged in the shielding net placement cavity;

[0008] The sleeve assembly comprises an in-cabinet pipe fitting and an out-cabinet pipe fitting, the in-cabinet pipe fitting is sleeved on the outer periphery of the out-cabinet pipe fitting, and an umbrella skirt (14) is provided on the outer periphery of the in-cabinet pipe fitting or the out-cabinet pipe fitting;

[0009] A conductor is arranged in the external pipe fitting of the cabinet, and the high-voltage shielding net is embedded between the sleeve assembly and the conductor.

[0010] In a possible implementation manner, a mounting surface is formed on the shielding net placement cavity, and an edge of the high-voltage shielding net is fixed on the mounting surface;

[0011] In the axial direction of the pipe fitting inside the cabinet, the length of the high-voltage shielding net in the pipe fitting inside the cabinet is greater than the length in the pipe fitting outside the cabinet.

[0012] In a possible implementation manner, a fixing hole is provided on the mounting surface.

[0013] In a possible implementation manner, a grounding screw hole is provided at the front end of the fixing hole, and a grounding screw is installed in the grounding screw hole.

[0014] In a possible implementation manner, a sealing ring groove is provided on the outer side of the fixing hole, and a sealing ring is installed in the sealing ring groove.

[0015] In a possible implementation manner, first U-shaped openings are provided at both ends of the pipe fitting in the cabinet.

[0016] In a possible implementation manner, second U-shaped openings are provided at both ends of the external cabinet pipe.

[0017] In a possible implementation manner, the second U-shaped opening is embedded in the first U-shaped opening, and the first U-shaped opening and the second U-shaped opening are adjacent to each other.

[0018] In a possible implementation manner, the conductor is a copper column, and the high-voltage shielding mesh is a copper mesh.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] 1. By providing an annular shed skirt on the outer wall of the sleeve assembly, the creepage distance of the conductive surfaces at both ends of the environmental protection cabinet bushing conductive parts is increased, meeting the bushing insulation performance requirements;

[0021] 2. The taper shape of the pipe fittings outside the cabinet is optimized into an umbrella shape, which is convenient for direct connection with the copper busbar of the metering cabinet, eliminating the step of pre-insertion of cables in the middle, saving costs and improving efficiency;

[0022] 3. By embedding a high-voltage shielding net, the extremely non-uniform electric field generated after energizing the conductor is transformed into a slightly non-uniform electric field, reducing the electric field strength at the installation surface inside the insulating sleeve cabinet and improving the insulation strength of the dielectric. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0024] Figure 2 is a sectional view of the overall structure of the present utility model.

[0025] In the figure: 10, sleeve assembly; 20, shielding net placement cavity; 11, pipe fitting outside the cabinet, 12, pipe fitting inside the cabinet, 13, conductor, 14, umbrella skirt, 15, first U-shaped opening, 16, second U-shaped opening, 21, high-voltage shielding net, 22, grounding screw hole, 23, sealing ring groove, 24, installation surface, 25, fixing hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] To further elaborate on the technical means and effects adopted by the present utility model to achieve the predetermined utility model purpose, the following combines the drawings and preferred embodiments to detail the specific embodiments, structures, features and effects according to the present utility model as follows.

[0027] As Figure 1-2 shown, a bushing for a metering cabinet includes a sleeve assembly 10 and a shielding net placement cavity 20. The sleeve assembly 10 is inserted into the shielding net placement cavity 20, and a high-voltage shielding net 21 is provided in the shielding net placement cavity 20. The sleeve assembly 10 includes a pipe fitting 12 inside the cabinet and a pipe fitting 11 outside the cabinet. The pipe fitting 12 inside the cabinet is sleeved on the outer periphery of the pipe fitting 11 outside the cabinet, and umbrella skirts 14 are provided on the outer periphery of the pipe fitting 12 inside the cabinet or the pipe fitting 11 outside the cabinet. A conductor 13 is provided inside the pipe fitting 11 outside the cabinet, and the high-voltage shielding net 21 is embedded between the sleeve assembly 10 and the conductor 13.

[0028] Among them, both the pipe fitting 12 inside the cabinet and the pipe fitting 11 outside the cabinet are made of insulating materials such as epoxy resin or silicone rubber. Sixteen umbrella skirts 14 are provided on the pipe fitting 12 inside the cabinet, and sixteen umbrella skirts 14 are also provided at the corresponding positions on the pipe fitting 11 outside the cabinet to increase the creepage distance between the conductor 13 and the cabinet body. The conductor 13 is made of a copper column, and the high-voltage shielding net 21 is made of a copper net.

[0029] An installation surface 24 is formed on the shielding net placement cavity 20. The installation surface 24 is a circular surface, and the diameter of the installation surface 24 is larger than the diameter of the rest of the shielding net placement cavity 20, that is, the shielding net placement cavity 20 forms a structure similar to a frustum of a cone.

[0030] The edge of the high-voltage shielding net 21 is fixed on the mounting surface 24. Along the axial direction of the pipe fitting 12 inside the cabinet, the length of the high-voltage shielding net 21 in the pipe fitting 12 inside the cabinet is greater than that in the pipe fitting 11 outside the cabinet. That is, the high-voltage shielding net 21 is arranged to extend along the axial direction of the pipe fitting 12 inside the cabinet or the pipe fitting 11 outside the cabinet. The length of the high-voltage shielding net 21 on the outer side away from the conductor 13 is greater than that on the inner side near the conductor. This setting can maximize the insulation performance of the ring main unit.

[0031] To fix the bushing of the present application to the cabinet wall of the ring main unit, fixing holes 25 are provided on the mounting surface 24. Internal threads can be provided in the fixing holes 25, and the bushing can be fixed by tightening screws. Generally, six fixing holes can be provided, and the six fixing holes are equally spaced on the mounting surface 24.

[0032] A grounding screw hole 22 is provided at the front end of the fixing hole 25, and a grounding screw is installed in the grounding screw hole 22 for grounding. A sealing ring groove 23 is provided on the outer side of the fixing hole 25, that is, on the side away from the pipe fitting 11 outside the cabinet. The sealing ring groove 23 is an annular groove, and a sealing ring is installed in the sealing ring groove 23 to play a sealing role when the bushing is connected to the cabinet wall of the ring main unit.

[0033] Furthermore, first U-shaped openings 15 are provided at both ends of the pipe fitting 12 inside the cabinet, and second U-shaped openings 16 are provided at both ends of the pipe fitting 11 outside the cabinet. The second U-shaped opening 16 is embedded in the first U-shaped opening 15, and the first U-shaped opening 15 and the second U-shaped opening 16 are adjacent. The two U-shaped openings can connect the busbars and can increase the insulation performance between two phases.

[0034] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front part", "center", "both ends", "left and right", "front and back", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is 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, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0035] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "setting", "connection", "fixation", "swivel connection", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] The above are only the preferred embodiments of the present utility model, and do not impose any formal limitations on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or refinements to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present utility model. However, as long as it does not depart from the content of the technical solution of the present utility model, any brief modifications, equivalent changes and refinements made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A bushing for a metering cabinet, comprising a sleeve assembly (10) and a shielding net placement cavity (20), characterized in that: The sleeve assembly (10) is inserted into the shielding net placement cavity (20), and a high-voltage shielding net (21) is arranged in the shielding net placement cavity (20); The sleeve assembly (10) comprises an in-cabinet pipe fitting (12) and an out-cabinet pipe fitting (11), the in-cabinet pipe fitting (12) being sleeved on the outer periphery of the out-cabinet pipe fitting (11), and an shed (14) being provided on the outer periphery of the in-cabinet pipe fitting (12) or the out-cabinet pipe fitting (11); A conductor (13) is arranged inside the external cabinet pipe (11), and the high-voltage shielding net (21) is embedded between the sleeve assembly (10) and the conductor (13).

2. The bushing for a metering cabinet according to claim 1, characterized in that: A mounting surface (24) is formed on the shielding net placement cavity (20), and an edge of the high-voltage shielding net (21) is fixed on the mounting surface (24); In the axial direction of the in-cabinet pipe fitting (12), the length of the high-voltage shielding net (21) in the in-cabinet pipe fitting (12) is greater than the length in the out-cabinet pipe fitting (11).

3. The bushing for a metering cabinet according to claim 2, characterized in that: The mounting surface (24) is provided with a fixing hole (25).

4. The bushing for a metering cabinet according to claim 3, characterized in that: A grounding screw hole (22) is provided at the front end of the fixing hole (25), and a grounding screw is installed in the grounding screw hole (22).

5. The bushing for a metering cabinet according to claim 3, characterized in that: A sealing ring groove (23) is provided on the outer side of the fixing hole (25), and a sealing ring is installed in the sealing ring groove (23).

6. The bushing for a metering cabinet according to claim 1, characterized in that: The two ends of the in-cabinet pipe (12) are provided with first U-shaped openings (15).

7. The bushing for a metering cabinet according to claim 6, characterized in that: The two ends of the external cabinet pipe (11) are provided with second U-shaped openings (16).

8. The bushing for a metering cabinet according to claim 7, characterized in that: The second U-shaped opening (16) is embedded in the first U-shaped opening (15), and the first U-shaped opening (15) and the second U-shaped opening (16) are adjacent to each other.

9. The bushing for a metering cabinet according to claim 1, characterized in that: The conductor (13) is made of a copper column, and the high-voltage shielding net (21) is made of a copper net.

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