Primary conductive circuit structure of a miniaturized medium-voltage switchgear

Abstract

The present invention discloses a primary conductive circuit structure of a miniaturized medium-voltage switchgear, including that in the busbar chamber, the distance between busbar copper bars is not less than the specified air insulation safety distance through adapter plates and T-shaped adapter components; three-phase contact boxes are respectively connected with a first adapter plate, a second adapter plate and a third adapter plate through T-shaped adapter components, and the adapter plates are respectively connected with three-phase busbar chamber copper bars. This connection structure not only enables the horizontal distance and the vertical distance between the busbar chamber copper bars to meet the specified air safety insulation distance, but also is applicable to the miniaturized medium-voltage switchgear. The present invention is a copper bar vertical placement scheme that jointly forms the primary conductive circuit copper bars of the entire device through a mixed copper bar scheme of vertical placement, horizontal connection, diagonal connection and special-shaped copper bar connection of copper bars, which can meet the requirements of safety insulation distance and operation requirements, and is a highly novel layout scheme for the primary conductive circuit inside the switchgear.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power, and particularly relates to a primary conductive loop structure of a miniaturized medium-voltage switchgear cabinet. Background Art

[0002] The miniaturized medium-voltage switchgear cabinet is a complete set of power distribution device for 3.6 - 12 kV three-phase alternating current 50 Hz single busbar and single busbar sectionalized system. Its main market is in coastal areas, especially in the distribution room areas where land resources are relatively tight. In order to be applied in this market, this equipment is specially developed. Its greatest advantage is saving civil construction area, which can effectively reduce the cost control target of the entire power distribution project and has a broad market prospect. This product can be applied in power distribution fields such as substations, power stations, petroleum, textile, automotive, ports, shopping malls, etc. Among them, the design of the very important primary conductive loop is very difficult. The structural particularity and space limitation are the difficulties. Whether it can be reasonably designed is crucial to the success or failure of the miniaturized product.

[0003] Currently, the connection between the contact box and the copper bar of large switchgear cabinets on the market is directly connected to the plane where the copper bar is located. According to the national regulations on the minimum air distance of the three-phase busbars for insulation safety distance, it cannot be less than 125 mm. For large switchgear cabinets, the safety distance between copper bars is very easy to control. The safety insulation distance between the busbar copper bars can be satisfied by adjusting the distance between the contact boxes.

[0004] However, during the miniaturization process of the switchgear cabinet, due to the limitation of the distance between the three-phase busbars and their corresponding adapter plates, and the three-phase busbars and their adapter plates are usually arranged in one plane, the length occupied by them is the sum of the widths of the three three-phase busbars, plus the spacing on both sides of the busbar and between adjacent busbars. That is, the minimum width of the preset space in the switchgear cabinet is the width of the busbar L * 3 + 125 mm * 4, which results in the inability to further miniaturize the switchgear cabinet.

[0005] Therefore, it is necessary to design a primary conductive loop with reasonable and novel structure that can meet the requirements of the air insulation safety distance of the miniaturized switchgear cabinet. Summary of the Invention

[0006] To solve the above problems, the invention discloses a primary conductive loop structure of a miniaturized medium-voltage switchgear cabinet. The structure of the connection between the copper bar in the busbar chamber and the contact box is improved. The originally directly connected copper bar in the busbar chamber is connected to the copper bar in the busbar chamber through a T-shaped adapter and an adapter plate, saving the spacing of the width of the adapter plate and the busbar, thus facilitating the further miniaturization of the switchgear cabinet.

[0007] To achieve the above object, the technical solution of the invention is as follows:

[0008] The primary conductive loop structure of a miniaturized medium-voltage switchgear cabinet includes a contact box and the switchgear cabinet body. The contact box includes an A-phase contact box, a B-phase contact box, and a C-phase contact box. The A-phase contact box, B-phase contact box, and C-phase contact box are all connected with T-shaped adapters. The A-phase contact box is connected with a first adapter plate through the T-shaped adapter. The B-phase contact box is connected with a second adapter plate through the T-shaped adapter. The C-phase contact box is connected with a third adapter plate through the T-shaped adapter. The first adapter plate is connected with an A-phase busbar chamber copper bar. The second adapter plate is connected with a B-phase busbar chamber copper bar. The third adapter plate is connected with a C-phase busbar chamber copper bar. The planar distances between the first adapter plate, the second adapter plate, the third adapter plate, and the side wall of the switchgear cabinet body are all not less than the specified air safety insulation distance. The distances between the A-phase busbar chamber copper bar and the B-phase busbar chamber copper bar, and the C-phase busbar chamber copper bar in the vertical space are all not less than the specified air safety insulation distance. The first adapter plate, the second adapter plate, and the third adapter plate are all in different planes, and the planes they are in are parallel to each other.

[0009] For further improvement, bending portions are formed at the upper ends of the first adapter plate, the second adapter plate, and the third adapter plate, and the bending portions are respectively connected with the A-phase busbar chamber copper bar, the B-phase busbar chamber copper bar, and the C-phase busbar chamber copper bar.

[0010] For further improvement, both the A-phase busbar chamber copper bar and the B-phase busbar chamber copper bar are L-shaped.

[0011] For further improvement, the second adapter plate and the third adapter plate are arranged in the vertical direction, and the first adapter plate is arranged in the horizontal direction.

[0012] For further improvement, the L-shaped bending surfaces of the A-phase busbar chamber copper bar and the B-phase busbar chamber copper bar and the C-phase busbar chamber copper bar are all in the same plane.

[0013] For further improvement, the specified air safety insulation distance is 125 mm.

[0014] For further improvement, the switchgear cabinet body further includes a cable chamber. A contact box is installed on the top side wall of the cable chamber. One end of the contact box outside the cable chamber is connected with a circuit breaker. One end of the contact box inside the cable chamber is horizontally connected with one end of a cable chamber horizontal copper bar. The other end of the cable chamber horizontal copper bar is connected with a current transformer. A cable chamber earthing switch copper bar is connected to the lower part of the current transformer at a certain angle. A grounding switch is connected to the lower part of the cable chamber earthing switch copper bar.

[0015] For further improvement, cable connection holes are provided on the cable chamber earthing switch copper bar.

[0016] Advantages of the present invention:

[0017] By virtue of the special spatial layout among the busbar chamber copper bars, T-shaped adapters, adapter plates and contact boxes, the internal space of the cabinet busbar chamber can be fully utilized to meet the insulation air distance. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the three-phase copper bar structure of the busbar chamber;

[0019] Figure 2 It is a schematic diagram of the T-shaped adapter structure;

[0020] Figure 3 Schematic diagram of the connection between the contact box and the T-shaped adapter;

[0021] Figure 4 Schematic diagram of the overall scheme of the busbar chamber copper bars;

[0022] Figure 5 Schematic diagram of the structure of the current transformer in the cable chamber;

[0023] Figure 6 Cross-sectional view of the layout of the primary circuit structure;

[0024] Figure 7 Oblique general view of the layout of the primary circuit structure.

[0025] Among them: Phase A copper bar 1 of the busbar chamber, Phase B copper bar 2 of the busbar chamber, Phase C copper bar 3 of the busbar chamber, T-shaped adapter 4, Phase A contact box 5, current transformer 7, cable chamber earthing switch copper bar 8, cable connection hole 9, earthing switch 10, circuit breaker 11, switchgear cabinet body 12, Phase B contact box 13, Phase C contact box 14, first adapter plate 15, second adapter plate 16, third adapter plate 17, contact box 18. Detailed Implementation Manner

[0026] The present invention will be further described below with reference to the drawings and embodiments. Embodiment

[0027] As Figure 1 shown, it is the structure of the primary conductive circuit of a miniaturized medium-voltage switchgear. Due to the limited space of this miniaturized product, the space of the busbar chamber is restricted. The copper bars in the busbar chamber cannot be designed according to the general conventional scheme, but are designed according to the Figure 1 three-phase combined copper bar scheme. As shown in the figure, it mainly consists of Phase A copper bar 1 of the busbar chamber, Phase B copper bar 2 of the busbar chamber, and Phase C copper bar 3 of the busbar chamber. Each phase of the copper bars has both vertical and horizontal placements, intersecting with each other, making the most of the three-dimensional space to achieve the purpose of meeting the insulation air distance. At the bottom of each phase of the copper bars, there is configured as Figure 2The T-shaped adapter 4 shown. In this embodiment, the T-shaped adapter 4 is a special-shaped connecting copper bar, and its main function is commutation connection. One end is connected to the vertically placed copper bar in the busbar chamber, and the other end is connected to the installation surface inside the contact box 18. This special-shaped connecting copper bar is a custom-made part by mold opening, with special technology and cannot be processed by bending technology using an ordinary CNC bending machine.

[0028] The contact box 18 connected to the upper contact arm of the circuit breaker at the bottom of the busbar chamber is interconnected with the phase A copper bar 1, phase B copper bar 2, and phase C copper bar 3 of the busbar chamber through a special-shaped connecting copper bar to jointly form a busbar chamber hybrid copper bar solution. The purpose of setting the third adapter piece 17 horizontally is to make the distance of the base point low and make better use of the space. As Figure 4 shown, the busbar chamber copper bar, special-shaped connecting copper bar, and contact box 18 form a busbar chamber hybrid copper bar solution that meets the insulation air distance through a special spatial layout combination and special-shaped copper bar connecting parts, and it is also a vertical placement solution for the primary conductive circuit copper bar in the busbar chamber.

[0029] The space in the cable chamber is very small, and the copper bar can only be directly connected and lapped, otherwise there will be insufficient insulation air distance, causing a fault arc. The copper bar connection solution for the current transformer part is as Figure 5 shown, mainly composed of the horizontal copper bar 6 in the cable chamber, the current transformer 7, and the copper bar 8 of the earthing switch in the cable chamber. Among them, the horizontal copper bar 6 in the cable chamber is vertically placed horizontally, which is convenient for copper bar processing and installation. The copper bar 8 of the earthing switch in the cable chamber is vertically placed obliquely, and the other end is lapped on the earthing switch 10 shown in the following figure. Its main purpose is not only to meet the insulation distance, but also a cable connection hole 9 is provided on the copper bar 8 of the earthing switch in the cable chamber, which is convenient for customers to lap the primary cable on the load side. The horizontal copper bar 6 in the cable chamber and the copper bar 8 of the earthing switch in the cable chamber form a vertical placement solution for the primary conductive circuit copper bar in the cable chamber through a new spatial layout structure.

[0030] Through as Figure 6 and Figure 7 shown, in the primary conductive circuit of the miniaturized switchgear, mainly through the vertical placement, horizontal connection, oblique connection, and special-shaped connection hybrid copper bar solutions of the copper bar, the vertical placement solution of the primary conductive circuit copper bar of the whole device is jointly formed, which can meet the requirements of safety insulation distance and operation requirements, and is a very novel layout solution for the primary conductive circuit inside the switch cabinet.

[0031] Although the implementation embodiments of the present invention have been disclosed as above, it is not limited to only the applications listed in the specification and implementation embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to specific details and those shown here.

Claims

1. The primary conductive circuit structure of a miniaturized medium-voltage switchgear cabinet includes a contact box (18) and a switchgear cabinet body (12). Characterized in that the contact box (18) includes a phase A contact box (5), a phase B contact box (13) and a phase C contact box (14); the phase A contact box (5), the phase B contact box (13) and the phase C contact box (14) are all connected with a T-shaped adapter (4), and the phase A contact box (5) is connected with a first adapter plate (15) through the T-shaped adapter (4); the phase B contact box (13) is connected with a second adapter plate (16) through the T-shaped adapter (4); the phase C contact box (14) is connected with a third adapter plate (17) through the T-shaped adapter (4); the first adapter plate (15) is connected with a phase A busbar chamber copper bar (1); the second adapter plate (16) is connected with a phase B busbar chamber copper bar (2); the third adapter plate (17) is connected with a phase C busbar chamber copper bar (3); the plane distances between the first adapter plate (15), the second adapter plate (16), the third adapter plate (17) and the side wall of the switchgear cabinet body (12) are all not less than 125 mm; the vertical space distances between the phase A busbar chamber copper bar (1) and the phase B busbar chamber copper bar (2), the phase C busbar chamber copper bar (3) are all not less than 125 mm; the first adapter plate (15), the second adapter plate (16), the third adapter plate (17) are all in different planes, and the planes where they are located are parallel to each other; the upper ends of the first adapter plate (15), the second adapter plate (16) and the third adapter plate (17) are all formed with bent portions, and the bent portions are respectively connected with the phase A busbar chamber copper bar (1), the phase B busbar chamber copper bar (2) and the phase C busbar chamber copper bar (3); the second adapter plate (16) and the first adapter plate (15) are arranged in the vertical direction, and the third adapter plate (17) is arranged in the horizontal direction.

2. The primary conductive circuit structure of a miniaturized medium-voltage switchgear cabinet according to claim 1, Characterized in that both the phase A busbar chamber copper bar (1) and the phase B busbar chamber copper bar (2) are L-shaped.

3. The primary conductive circuit structure of a miniaturized medium-voltage switchgear cabinet according to claim 1, Characterized in that the switchgear cabinet body (12) further includes a cable chamber, a contact box (18) is installed on the side wall of the top of the cable chamber, one end of the contact box (18) outside the cable chamber is connected with a circuit breaker (11), one end of the contact box (18) inside the cable chamber is horizontally connected with one end of a cable chamber horizontal copper bar (6), the other end of the cable chamber horizontal copper bar (6) is connected with an instrument transformer (7), a cable chamber earthing switch copper bar (8) is connected to the lower part of the instrument transformer (7) at a certain angle, and an earthing switch (10) is connected to the lower part of the cable chamber earthing switch copper bar (8).

4. The primary conductive circuit structure of a miniaturized medium-voltage switchgear cabinet according to claim 3, Characterized in that a cable connection hole (9) is arranged on the cable chamber earthing switch copper bar (8).

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