Lower incoming line connecting structure used between low-voltage side of main transformer and incoming line switch cabinet

Abstract

The utility model relates to a lower incoming line connecting structure used between a low-voltage side of a main transformer and an incoming line switch cabinet. The lower incoming line connecting structure comprises a wall bushing installed at the bottom of the incoming line switch cabinet in a penetrating manner; a sealing box is arranged below the inlet wire switch cabinet, and the wall bushing is mounted at the bottom of the inlet wire switch cabinet and the top of the sealing box in a penetrating manner; an inlet wire joint of the inlet wire switch cabinet is connected with a main transformer low-voltage side bus through a wall bushing; one end of the main transformer low-voltage side bus is installed on the wall body of the cable trench and the side wall of the sealing box in a penetrating mode and connected with an incoming line connector of the incoming line switch cabinet. And the main transformer low-voltage side bus adopts an insulating copper pipe bus. According to the utility model, the layout in the cabin is optimized, the space utilization rate is improved, the modular design enables the field installation to be more convenient, the workload of field welding and assembling is reduced, and the installation cost and time are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of switch cabinet prefabricated cabins, and particularly relates to a lower-inlet connection structure between the low-voltage side of a main transformer and an incoming line switch cabinet. Background Art

[0002] Due to the advantages of the switch cabinet prefabricated cabin with a single-cabin scheme, such as integration, intelligence, and small floor area, the switch cabinet prefabricated cabin with a single-cabin scheme is widely used. At present, there are indeed some challenges in the design and implementation of switch cabinet prefabricated cabins, especially problems related to the construction incoming line auxiliary cabinet. These factors have the following important impacts on the overall design and on-site installation of the prefabricated cabin:

[0003] (1) The need to deepen the depth of the cabin: In traditional designs, due to the integration of the construction incoming line auxiliary cabinet, the depth of the prefabricated cabin has to be increased accordingly to accommodate these auxiliary devices and their necessary operating space. This not only increases the volume and weight of the prefabricated cabin, but also may bring additional difficulties to the transportation and installation processes, such as the need for larger lifting equipment and more complex on-site layout planning.

[0004] (2) The complexity of cable construction: The splicing work of cables in the prefabricated cabin is a technical difficulty. Due to the limited space in the cabin, combined with a large number and large specifications of cables, the on-site cable laying and connection become extremely complex, which is likely to lead to a reduction in construction efficiency and also increases safety risks. In addition, improper cable management may also affect the heat dissipation of the equipment in the cabin and the smoothness of the maintenance passage.

[0005] (3) The limitations of the overhead copper busbar incoming line method: Although using the overhead copper busbar as the incoming line method may have its advantages in electrical performance, it inevitably leads to an increase in the size of the prefabricated cabin body. The space occupation and fixing requirements of the copper busbar require more consideration in the design of the cabin structure, which may sacrifice a part of the valuable effective use area in the cabin, or force the overall external dimensions of the prefabricated cabin to exceed the normal, thus affecting the convenience of transportation and installation.

[0006] Therefore, a lower-inlet connection structure between the low-voltage side of a main transformer and an incoming line switch cabinet is designed. Content of the Utility Model

[0007] In order to solve the deficiencies in the prior art, the purpose of the utility model is to provide a lower-inlet connection structure between the low-voltage side of a main transformer and an incoming line switch cabinet. This connection structure helps to optimize the layout in the cabin, improve the space utilization rate. Its modular design makes the on-site installation more convenient, reduces the on-site welding and assembly work, and lowers the installation cost and time.

[0008] To achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A lower incoming line connection structure between the low-voltage side of the main transformer and the incoming line switch cabinet. The lower incoming line connection structure includes a wall-through bushing installed through the bottom of the incoming line switch cabinet. A sealed box is provided below the incoming line switch cabinet, and the wall-through bushing is installed through the bottom of the incoming line switch cabinet and the top of the sealed box. The incoming line joint of the incoming line switch cabinet is connected to the low-voltage side busbar of the main transformer through the wall-through bushing. One end of the low-voltage side busbar of the main transformer is installed through the wall of the cable trench and the side wall of the sealed box and is connected to the incoming line joint of the incoming line switch cabinet. The low-voltage side busbar of the main transformer uses an insulated copper tube busbar.

[0010] Preferably according to the present invention, the lower incoming line connection structure further includes a post insulator. The post insulator is installed on the wall of the cable trench. The post insulator is used to support the low-voltage side busbar of the main transformer.

[0011] Preferably according to the present invention, a sealed wall insulation board is provided on the wall of the cable trench.

[0012] Preferably according to the present invention, the sealed box is installed on the wall of the cable trench.

[0013] Preferably according to the present invention, an expansion joint is provided in the sealed box. The expansion joint is used to connect the wall-through bushing and the low-voltage side busbar of the main transformer.

[0014] Preferably according to the present invention, openings are provided on the top and side walls of the sealed box for the installation of the wall-through bushing and the low-voltage side busbar of the main transformer.

[0015] Preferably according to the present invention, the low-voltage side busbar of the main transformer uses an insulated copper tube busbar. One end of the low-voltage side busbar of the main transformer is installed through the wall of the cable trench and the side wall of the sealed box, and the other end is connected to the incoming line joint of the incoming line switch cabinet through the wall-through bushing.

[0016] Preferably according to the present invention, the wall of the cable trench is used to support and protect the cables and busbars in the cable trench. An opening is provided on the wall of the cable trench for the low-voltage side busbar of the main transformer to pass through and enter the sealed box.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] (1) For the connection structure of the present invention, the lower incoming line connection between the low-voltage side of the main transformer and the incoming line switch cabinet of the main transformer is carried out using a fully insulated copper tube busbar. A wall-through bushing is used to access the sealed box below the switch cabinet. The lower part of the incoming line switch cabinet is connected to the low-voltage side of the main transformer through the fully insulated copper tube busbar. A post insulator is used to support the fully insulated copper tube busbar, and a sealed wall insulation board is used to fix and insulate and protect the fully insulated copper tube busbar.

[0019] (2) The fully insulated copper tube busbar adopted by the utility model has a compact structure. Compared with the overhead copper busbar, it reduces the occupancy of the prefabricated cabin space, helps to optimize the layout inside the cabin, and improves the space utilization rate. Its modular design makes on-site installation more convenient, reduces the on-site welding and assembly workload, and lowers the installation cost and time. The use of the fully insulated layer significantly improves the electrical safety level of the system, effectively prevents the busbar from being eroded by external environmental factors (such as moisture, dust, corrosive gas), and reduces the risk of short circuit and grounding faults. At the same time, the heat resistance and flame retardancy of the copper tube busbar further enhance the fire safety of the system. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the lower-inlet connection structure used between the low-voltage side of the main transformer and the incoming line switch cabinet in the utility model.

[0021] Wherein:

[0022] 1. Incoming line switch cabinet, 2. Wall bushing, 3. Sealing box, 4. Low-voltage side busbar of the main transformer, 5. Post insulator, 6. Sealing wall insulating board, 7. Expansion joint. Specific Embodiment

[0023] The following further describes the utility model with reference to the drawings:

[0024] As Figure 1 shown, a lower-inlet connection structure used between the low-voltage side of the main transformer and the incoming line switch cabinet, the lower-inlet connection structure includes a wall bushing 2 installed through the bottom of the incoming line switch cabinet 1; a sealing box 3 is provided below the incoming line switch cabinet 1, and the wall bushing 2 is installed through the bottom of the incoming line switch cabinet 1 and the top of the sealing box 3; the incoming line joint of the incoming line switch cabinet 1 is connected to the low-voltage side busbar 4 of the main transformer through the wall bushing 2; one end of the low-voltage side busbar 4 of the main transformer is installed through the wall of the cable trench and the side wall of the sealing box 3 and is connected to the incoming line joint of the incoming line switch cabinet 1; the low-voltage side busbar 4 of the main transformer adopts an insulated copper tube busbar.

[0025] The lower incoming line connection structure between the low-voltage side of the main transformer and the incoming line switchgear in this embodiment aims to optimize the space layout, improve electrical safety, and simplify installation and maintenance. The incoming line switchgear is located at the upper part of the system and is responsible for controlling and protecting the incoming line joints of the power system. A wall bushing 2 is provided at the bottom for introducing cables or busbars from the outside into the switchgear interior. The wall bushing 2 is installed through the bottom of the incoming line switchgear 1 and extends to the top of the sealed box 3; the wall bushing 2 is used to introduce the low-voltage side busbar 4 of the main transformer into the incoming line switchgear 1 through the wall, providing electrical isolation and mechanical protection to prevent moisture, dust, and other external factors from entering. The sealed box 3 is located below the incoming line switchgear 1 and is used to accommodate and protect the wall bushing 2 and part of the low-voltage side busbar 4 of the main transformer. Openings are provided on the top and side walls of the sealed box 3 for the installation of the wall bushing 2 and the low-voltage side busbar 4 of the main transformer. The low-voltage side busbar 4 of the main transformer uses an insulated copper tube busbar, which has good electrical conductivity and electrical safety. One end of the low-voltage side busbar 4 of the main transformer is installed through the wall of the cable trench and the side wall of the sealed box 3, and the other end is connected to the incoming line joint of the incoming line switchgear 1 through the wall bushing 2. The insulated copper tube busbar has an insulating layer, which can effectively prevent the busbar from being eroded by external environmental factors (such as moisture, dust, corrosive gases), improving the reliability of the system. The wall of the cable trench is used to support and protect the cables and busbars in the cable trench, and openings are provided on the wall for the low-voltage side busbar 4 of the main transformer to pass through and enter the sealed box 3. The above-mentioned lower incoming line connection structure between the low-voltage side of the main transformer and the incoming line switchgear can achieve efficient, safe, and reliable lower incoming line connection between the low-voltage side of the main transformer and the incoming line switchgear, not only optimizing the space utilization, but also improving the overall performance and maintenance convenience of the system.

[0026] Preferably according to the present utility model, the lower incoming line connection structure further includes a post insulator 5; the post insulator 5 is installed on the wall of the cable trench; the post insulator 5 is used to support the low-voltage side busbar 4 of the main transformer to ensure its stability and safety in the cable trench. The post insulator not only provides mechanical support but also provides additional electrical insulation to prevent short circuits and ground faults.

[0027] Preferably according to the present utility model, a sealing wall insulation board 6 is provided on the wall of the cable trench. The sealing wall insulation board 6 is used to provide additional insulation protection to prevent short circuits and ground faults, and at the same time plays a sealing role to prevent moisture and dust from entering the cable trench.

[0028] Preferably according to the present utility model, the sealed box 3 is installed on the wall of the cable trench.

[0029] Preferably according to the present utility model, an expansion joint 7 is provided in the sealed box 3; the expansion joint 7 is used to connect the wall bushing 2 and the low-voltage side busbar 4 of the main transformer. The expansion joint 7 provides a certain degree of flexibility to adapt to temperature changes and mechanical stresses, reducing stress concentration in the system and extending the service life.

[0030] In summary, the utility model realizes the lower incoming connection between the low-voltage side of the main transformer and the incoming switch cabinet by using a fully insulated copper tube busbar. Under this design, there is no need to deepen the depth of the switch cabinet, nor is there a need for an additional incoming joint auxiliary cabinet, ensuring the space of the operation and maintenance transfer channel, making the maintenance, inspection and replacement of equipment more convenient and improving the operation and maintenance efficiency; and it avoids complex steps such as splicing in cable construction, greatly simplifies the construction process, and reduces the construction difficulty and cost. In addition, this lower wiring method does not require additional space to accommodate the incoming equipment, thus avoiding the increase in the size of the prefabricated cabin and facilitating transportation and hoisting.

[0031] The above-described embodiments are only descriptions of the preferred embodiments of the utility model and do not limit the scope of the utility model. Without departing from the design spirit of the utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solution of the utility model shall fall within the protection scope determined by the claims of the utility model.

Claims

1. A lower incoming line connection structure between the low-voltage side of the main transformer and the incoming line switch cabinet, characterized in that, The lower incoming line connection structure includes a wall bushing (2) installed through the bottom of the incoming line switchgear (1); a sealing box (3) is provided below the incoming line switchgear (1), and the wall bushing (2) is installed through the bottom of the incoming line switchgear (1) and the top of the sealing box (3); the incoming line joint of the incoming line switchgear (1) is connected to the low-voltage side busbar (4) of the main transformer through the wall bushing (2); one end of the low-voltage side busbar (4) of the main transformer is installed through the wall of the cable trench and the side wall of the sealing box (3) and is connected to the incoming line joint of the incoming line switchgear (1); the low-voltage side busbar (4) of the main transformer uses an insulated copper tube busbar.

2. The lower incoming line connection structure for the low-voltage side of the main transformer and the incoming line switchgear according to claim 1, wherein the lower incoming line connection structure further includes a post insulator (5); the post insulator (5) is installed on the wall of the cable trench; the post insulator (5) is used to support the low-voltage side busbar (4) of the main transformer.

3. The lower incoming line connection structure for the low-voltage side of the main transformer and the incoming line switchgear according to claim 1, wherein a sealing wall insulating board (6) is provided on the wall of the cable trench.

4. The lower incoming line connection structure for the low-voltage side of the main transformer and the incoming line switchgear according to claim 1 or 2 or 3, wherein the sealing box (3) is installed on the wall of the cable trench.

5. The lower incoming line connection structure for the low-voltage side of the main transformer and the incoming line switchgear according to claim 1, wherein a expansion joint (7) is provided in the sealing box (3); the expansion joint (7) is used to connect the wall bushing (2) and the low-voltage side busbar (4) of the main transformer.

6. The lower incoming line connection structure for the low-voltage side of the main transformer and the incoming line switchgear according to claim 1, wherein openings are provided on both the top and the side wall of the sealing box (3) for the installation of the wall bushing (2) and the low-voltage side busbar (4) of the main transformer.

7. The lower incoming line connection structure for the low-voltage side of the main transformer and the incoming line switchgear according to claim 1, wherein the low-voltage side busbar (4) of the main transformer uses an insulated copper tube busbar, one end of the low-voltage side busbar (4) of the main transformer is installed through the wall of the cable trench and the side wall of the sealing box (3), and the other end is connected to the incoming line joint of the incoming line switchgear (1) through the wall bushing (2).

8. The lower incoming line connection structure for the low-voltage side of the main transformer and the incoming line switchgear according to claim 1, wherein the wall of the cable trench is used to support and protect the cables and busbars in the cable trench; an opening is provided on the wall of the cable trench for the low-voltage side busbar (4) to pass through and enter the sealing box (3).

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