Low-voltage bus support

Abstract

The utility model belongs to the technical field of transformer equipment, and relates to a low-voltage bus support, which comprises two channel steel supports, each channel steel support is divided into a front section and a rear section, and a corner is arranged between the two sections; the rear section of the channel steel bracket is fixedly connected to two sides of the low-voltage sleeve and is far away from the bent box cover of the low-voltage sleeve, and the front section of the channel steel bracket horizontally extends outwards; the front section of the channel steel bracket is fixedly connected with a horizontal connecting channel steel; a plurality of fixed inclined support reinforcing irons are arranged between the lower surface of the horizontal connecting channel steel and the tank wall of the oil tank; a plurality of fixed low-voltage bus support beams are arranged on the upper surface of the channel steel bracket; a mounting chassis is welded on the upper surface of the low-voltage bus support beam, and a low-voltage bus support insulator is mounted on the mounting chassis. According to the utility model, the low-voltage bus support problem is solved, and damage and leakage caused by long-term stress and compression of the cooling mother pipe and the fin radiator are avoided; the low-voltage bus support is installed in a large-span mode, and the potential safety hazard that a low-voltage sleeve discharges to the low-voltage bus support is avoided.

Description

Technical Field

[0001] The utility model relates to a high-strength and large-span low-voltage busbar support applicable to a transformer with a bent box cover, belonging to the technical field of transformer equipment. Background Art

[0002] The layout of the transformer cooling device is divided into integral cooling and centralized cooling.

[0003] When the layout mode is integral cooling, the coolers are usually hung on both sides of the long axis direction of the transformer, so that the low-voltage busbar post insulators cannot be supported on the ground. The usual method is to fix the support on the cooling main pipe or the finned Φ80 pipe, and then install the post insulators on the support to support the low-voltage busbar (copper pipe or copper row). Installing the support on the cooling main pipe or the fins will cause the cooling main pipe or the fins to be oppressed by gravity for a long time, which is likely to cause oil leakage in the cooling main pipe or the fins. In addition, with the increase of the current transformer capacity, in order to improve the current-carrying capacity, the weight of the low-voltage busbar is getting heavier and heavier, and the pressure on the cooling main pipe and the fins is greater. Moreover, the magnetostrictive vibration during the operation of the transformer and the shaking of the busbar caused by the wind will also exacerbate the occurrence of oil leakage in the cooling main pipe or the fins. If the span of the support is insufficient, it may cause the low-voltage bushing to discharge to the support, posing a safety hazard.

[0004] When the layout mode is centralized cooling, there is no cooler blocking around the transformer at this time. Generally, a foundation is designed in the oil pool close to the transformer to install the low-voltage busbar post. However, there are also some special cases, such as substation projects of transfer stations, renovations, and expansions, where there is no reserved low-voltage busbar post in the oil pool. At this time, a low-voltage busbar support needs to be designed on the transformer to smoothly lead out the low-voltage busbar. Because the transformer is divided into a flat top box cover and a bent box cover, and the bent box cover is widely used in high-voltage grade and large-capacity transformers. The bent box cover increases the difficulty of the low-voltage busbar support design, and a more stable and safe low-voltage busbar support structure needs to be designed by comprehensively considering aspects such as strength and installation position. Summary of the Invention

[0005] In order to solve the above technical problems, the utility model provides a high-strength and large-span low-voltage busbar support applicable to a transformer with a bent box cover, and the technical scheme adopted is as follows:

[0006] The low-voltage busbar support includes two channel steel supports. The channel steel supports are divided into front and rear sections, and there is a downward obtuse-angle corner between the front and rear sections; the rear section is fixedly connected to the bent box cover on both sides of the low-voltage bushing and away from the low-voltage bushing, and the front section of the channel steel support extends horizontally outwards; a horizontal connecting channel steel is fixedly connected between the front sections of the two channel steel supports, and several inclined support reinforcing irons are arranged between the lower surface of the horizontal connecting channel steel and the tank wall; several low-voltage busbar support beams are arranged on the upper surface of the channel steel support; an installation chassis is arranged on the upper surface of the low-voltage busbar support beam, and low-voltage busbar support insulators are installed on the installation chassis.

[0007] Preferably, the low-voltage busbar support beam is installed perpendicular to the channel steel bracket, or alternatively, according to requirements, the low-voltage busbar support beam and the channel steel bracket can be installed at a certain inclination angle.

[0008] Preferably, for an integrated cooling transformer, the cooling device may block the low-voltage busbar bracket. Therefore, the front section of the channel steel bracket is located above the cooling main pipe, and the inclined support reinforcing iron passes through the gap between adjacent cooling fins.

[0009] Preferably, the connection of the rear section of the channel steel bracket can adopt a combination of welding and bolts. An additional support base is added to each of the two channel steel brackets. The support base is drilled with screw holes and is connected to the rear section of the seat channel steel bracket through bolts. The support base is welded to the bent box cover.

[0010] Preferably, the connection between the horizontal connecting channel steel and the inclined support reinforcing iron adopts a combination of welding and bolts. A plurality of connecting plates are welded to the lower surface of the horizontal connecting channel steel. The connecting plates are drilled with screw holes and are fixedly connected to the inclined support reinforcing iron through bolts.

[0011] Preferably, the connection between the oil tank wall and the inclined support reinforcing iron adopts a combination of welding and bolts. The inclined support bases are respectively welded to the bent box covers on both sides of the low-voltage bushing and the tap-off head, away from the low-voltage bushing. The inclined support bases are drilled with screw holes and are fixedly connected to the two channel steel brackets respectively using bolts.

[0012] Advantages of the present utility model:

[0013] The low-voltage busbar bracket provided by the present utility model forms a solid support structure through the structural combination of each support member. The oil tank wall and the bent box cover are connected as load-bearing components to the low-voltage busbar bracket. While solving the problem of low-voltage busbar support, the cooling main pipe and the fins no longer bear the load, avoiding damage and leakage caused by long-term stress and compression of the cooling main pipe and the fins. The low-voltage busbar bracket is installed with a large span and is far away from the low-voltage bushing, avoiding potential safety hazards of discharge of the low-voltage bushing to the bracket. The connection method of some structures is preferably a combination of bolts and welding, which is convenient for disassembly and assembly while ensuring the load-bearing strength. Description of the drawings

[0014] In order to more clearly illustrate the technical solutions of the present invention, the drawings used in the technical solutions will be briefly introduced below;

[0015] Figure 1 It is the left view of the low-voltage busbar bracket of the embodiment of the present utility model;

[0016] Figure 2 It is the top view of the low-voltage busbar bracket of the embodiment of the present utility model;

[0017] In the figure, 1 is a cooling fin, 2 is a cooling main pipe, 3 is a support base, 4 is an inclined support base, 5 is a riser, 6 is a low-voltage bushing; 7 is a low-voltage busbar, 8 is a low-voltage busbar support insulator, 9 is a connecting plate, 10 is an inclined support reinforcing iron, 11 is a horizontal connecting channel steel, 12 is a channel steel support, 13 is a low-voltage busbar support beam, 14 is the tank wall, 15 is a bent cover, and 16 is an installation chassis. Detailed implementation mode

[0018] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments.

[0019] As Figure 1 、 2 shown, the low-voltage busbar support structure includes two support bases 3, which are respectively welded on the bent covers 15 on both sides of the low-voltage bushing 6 and the riser 5, away from the low-voltage bushing 6. Screw holes are drilled in the support base 3, and bolts are used to fixedly connect with two channel steel supports 12 with obtuse-angle corners respectively. The part of the channel steel support 12 from the corner to the bolt fixed end is called the rear section, and the part extending from the corner away from the tank wall 14 is called the front section.

[0020] Through holes are drilled on the lower surface of the front section of the channel steel support 12. A horizontal connecting channel steel 11 is fixedly installed between the two channel steel supports 12 with bolts. A plurality of connecting plates 9 with through holes drilled are welded on the lower surface of the horizontal connecting channel steel 11. A plurality of inclined support reinforcing irons 10 are designed between the tank wall 14 and the channel steel support 12, and the specific number can be adjusted according to the span of the channel steel support 12, the weight of the low-voltage busbar 7, etc. One end of the inclined support reinforcing iron 10 is fixedly connected to the inclined support base 4 with bolts, and the other end is fixedly connected to the connecting plate 9 on the lower surface of the horizontal connecting channel steel 11 with bolts. The inclined support base 4 is welded on the tank wall 14. Through this installation method, components 9, 10, 11, 12, and 13 form a stable frame structure. When the cooling layout of the transformer is integrated cooling, the front section of the channel steel support 12 is located above the cooling main pipe 2, and the installation of the inclined support reinforcing iron 10 needs to pass through the gap between adjacent cooling fins 1. When the cooling layout of the transformer is centralized cooling, since there is no cooling main pipe 2 and cooling fins 1 blocking around the low-voltage bushing 6, the entire low-voltage busbar support can be arranged more conveniently and freely.

[0021] On the upper surfaces of the two channel steel supports 12, one or more low-voltage busbar support beams 13 are welded, which can be installed and welded perpendicular to the channel steel support 12 as shown in the attached Figure 2 figure, or can be welded to the channel steel support 12 at a certain inclination angle according to the actual needs of the substation site, so as to lead the low-voltage busbar 7 to different directions.

[0022] Weld and install the mounting chassis 16 on the upper surface of the low-voltage bus support beam 13, and drill mounting holes in the mounting chassis 16 for installing the low-voltage bus support insulator 8. The specific pitch, quantity, and size of the mounting holes are coordinated with the low-voltage bus support insulator 8 to ensure the secure installation of the low-voltage bus support insulator 8. Install the low-voltage bus 7 (copper bar or copper tube) above the low-voltage bus support insulator 8, so as to safely and stably lead out the low-voltage bus 7.

[0023] The channel steel bracket 12 serves as the foundation of the entire low-voltage bus bracket, and the channel steel bracket 12 can adopt L-shaped 14# channel steel. The low-voltage bus support beam 13 serves as the installation and support foundation of the low-voltage bus support insulator 8, and the low-voltage bus support beam 13 can adopt 8# channel steel.

[0024] The channel steel bracket 12 is far away from the low-voltage bushing 6, that is, installed with a large span. The purpose is to meet the external insulation distance of the low-voltage bushing 6 inclinedly installed on the bending box cover 15 and prevent the low-voltage bushing 6 from discharging to the channel steel bracket 12. Therefore, this low-voltage bus bracket can be used as the bus bracket for bushings with voltage levels of 10.5 kV, 38.5 kV, and higher.

[0025] In the embodiment of the present utility model, the technical features not described in detail are all prior art or conventional technical means and will not be elaborated herein.

[0026] Finally, it should be noted that: the above embodiments are only specific implementation manners of the present utility model, used to illustrate the technical solutions of the present utility model, rather than limiting it. The protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that: any person skilled in the art within the technical scope disclosed by the present utility model can modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes, or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model, and should all be covered within the protection scope of the present utility model.

Claims

1. Low-voltage busbar support, characterized in that: It includes two channel steel supports. The channel steel supports are divided into front and rear sections, and there is a downward obtuse-angle corner between the front and rear sections. The rear section is fixedly connected to the bending box cover on both sides of the low-voltage bushing and far away from the low-voltage bushing. The front section of the channel steel support extends horizontally outwards. A horizontal connecting channel steel is fixedly connected between the front sections of the two channel steel supports. There are several inclined support reinforcing irons between the lower surface of the horizontal connecting channel steel and the tank wall. There are several low-voltage busbar support beams on the upper surface of the channel steel support. An installation chassis is arranged on the upper surface of the low-voltage busbar support beam, and low-voltage busbar support insulators are installed on the installation chassis.

2. The low-voltage busbar support according to claim 1, wherein: The low-voltage busbar support beam is installed perpendicular to the direction of the channel steel support, or the low-voltage busbar support beam and the channel steel support are installed at a certain inclined angle.

3. The low-voltage busbar support according to claim 1 or 2, characterized in that: The front section of the channel steel support is located above the cooling main pipe, and the inclined support reinforcing iron passes through the gap between adjacent cooling fins.

4. The low-voltage busbar support according to claim 1 or 2, characterized in that: One support base is added to each of the two channel steel supports. Screw holes are drilled in the support base, and it is connected to the rear section of the seat channel steel support through bolts. The support base is welded to the bending box cover.

5. The low-voltage busbar support according to claim 1 or 2, characterized in that: Several connecting plates are welded on the lower surface of the horizontal connecting channel steel. Screw holes are drilled in the connecting plates, and they are fixedly connected to the inclined support reinforcing iron through bolts.

6. The low-voltage busbar support according to claim 1 or 2, characterized in that: The inclined support bases are respectively welded to the bending box covers on both sides of the low-voltage bushing and the riser, far away from the low-voltage bushing. Screw holes are drilled in the inclined support bases, and they are respectively fixedly connected to the two channel steel supports using bolts.

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