H-type photovoltaic low-voltage convergence cabinet

Abstract

The utility model discloses an H-shaped photovoltaic low-voltage confluence cabinet which comprises a connecting cabinet body and a frame cabinet body, the connecting cabinet body is communicated with the frame cabinet body, and the connecting cabinet body is provided with a heat dissipation device. The operation surface deviates from the connecting cabinet body, and the maintenance surface is close to the connecting cabinet body; the frame is provided with a frame circuit breaker, the frame circuit breaker is connected with the first bus copper bar group, the operation surface is provided with a molded case circuit breaker module, the molded case circuit breaker module is connected with the second bus copper bars, and the tail ends of the plurality of second bus copper bars are respectively connected with the first bus copper bar; and the first bus copper bar group and the second bus copper bar group are arranged close to the maintenance surface of the frame cabinet body. A maintenance channel with the front end and the rear end communicated is formed between the two maintenance faces. The first bus copper bar group and the second bus copper bar group are arranged close to the maintenance surface, so that heat can be prevented from being directly radiated to the operation surface, normal operation of the bus cabinet is avoided, and the problems of difficult maintenance and slow heat dissipation caused by narrow maintenance space of a traditional bus cabinet are solved.

Description

Technical Field

[0001] This utility model relates to the field of combiner cabinet technology, specifically an H-type photovoltaic low-voltage combiner cabinet. Background Technology

[0002] In modern power systems, combiner cabinets are the core devices for power distribution and protection, and their performance and reliability directly affect the stable operation of the entire power network. To meet the needs of more branch connections, traditional designs often tend to arrange as many copper busbars and circuit breakers as possible in a limited space, using an interleaved arrangement to maximize the expansion of branch capacity in terms of physical dimensions.

[0003] However, the extreme compression of internal space directly leads to a cramped maintenance area. Technicians often face insufficient operating space when performing routine maintenance, fault diagnosis, or component replacement, forcing them to adopt unconventional postures or use special tools. This not only increases the difficulty of the work but also prolongs maintenance time and reduces work efficiency. More seriously, this compact layout restricts airflow, causing heat to accumulate inside the combiner cabinet and be difficult to dissipate effectively. This exacerbates the heat load on the equipment, affects the performance and lifespan of components, and may even lead to overheating failures, threatening the safety of the entire power system. Utility Model Content

[0004] To address the aforementioned shortcomings, this utility model proposes an H-type photovoltaic low-voltage combiner cabinet, which solves the problems of difficult maintenance and slow heat dissipation caused by the limited maintenance space in traditional combiner cabinets.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] An H-type photovoltaic low-voltage combiner cabinet includes a connecting cabinet and a frame cabinet. The frame cabinets are installed at both ends of the connecting cabinet and are parallel to each other. The connecting cabinet is connected to the frame cabinet and is equipped with a heat dissipation device. The operating surface of the frame cabinet is away from the connecting cabinet, and the maintenance surface of the frame cabinet is close to the connecting cabinet.

[0007] The frame cabinet is equipped with a molded case circuit breaker module, a frame circuit breaker, a first busbar group and a second busbar group; the length direction of the first busbar group is vertical, and the length direction of the second busbar group is front-to-back.

[0008] A frame circuit breaker is installed at the top of the operating surface of the frame cabinet. The input end of the frame circuit breaker is connected to the top of the first busbar group. The operating surface of the frame cabinet is provided with multiple sets of molded case circuit breaker modules. The multiple sets of molded case circuit breaker modules are all located below the frame circuit breaker and arranged in a vertical direction. The molded case circuit breaker modules are connected to the second busbar. The multiple molded case circuit breaker modules correspond one-to-one with the multiple second busbars. The ends of the multiple second busbars are respectively connected to the first busbar.

[0009] Both the first and second busbar groups are located close to the maintenance surface of the frame cabinet.

[0010] The molded case circuit breaker module includes multiple three-phase molded case circuit breakers, which are arranged in a front-to-back direction.

[0011] The tops of the multiple three-phase molded case circuit breakers are respectively connected to the second busbar group via a first connecting copper busbar group, and the bottoms of the three-phase molded case circuit breakers are connected to insulators via a second connecting copper busbar assembly. The insulators are fixedly installed on the maintenance surface of the frame cabinet.

[0012] The adjacent insulators are arranged alternately.

[0013] The second busbar group includes three second busbars, which are arranged in a left-right direction; the first busbar group includes three first busbars, which are arranged in a front-back direction.

[0014] The three first busbars correspond one-to-one with the three second busbars.

[0015] The connecting cabinet is equipped with an output copper busbar, which includes a first connecting part and a second connecting part that are perpendicular to each other. The length direction of the first connecting part is the left-right direction, and the length direction of the second connecting part is the front-back direction. The first connecting part is connected to the frame circuit breaker, and the front end of the second connecting part extends out of the front side wall of the connecting cabinet.

[0016] The rear side wall of the frame cabinet is provided with multiple heat dissipation grilles, which are arranged in a matrix.

[0017] The heat dissipation device is a centrifugal fan, and the heat dissipation device is located on the rear side of the connecting cabinet.

[0018] An input copper busbar group is provided between the frame circuit breaker and the first busbar group. The input copper busbar group includes three input copper busbars, which are obliquely connected to the frame circuit breaker and the first busbar group.

[0019] The technical solution of this utility model can include the following beneficial effects:

[0020] 1. The maintenance surfaces of the two frame cabinets are positioned opposite each other, with a fast heat dissipation maintenance passage running through both ends between the two maintenance surfaces. Placing the first and second busbar groups, which generate a lot of heat, close to the maintenance surfaces not only prevents heat from directly radiating to the operating surfaces, thus ensuring the normal operation of the molded case circuit breaker module and the frame circuit breaker, but also accelerates heat conduction and diffusion, reducing the risk of localized overheating.

[0021] 2. The first busbar group is arranged vertically, and the second busbar group is arranged horizontally, making full use of the internal space of the frame cabinet, reducing the area occupied by the busbars, and improving the integration of the equipment. In addition, the current directions of the first and second busbar groups are perpendicular to each other, which makes the magnetic field directions generated by the first and second busbar groups perpendicular as well, significantly reducing the magnetic field coupling effect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a combiner cabinet according to one embodiment of this utility model;

[0023] Figure 2 This is a schematic diagram of the interior of a frame cabinet according to one embodiment of this utility model. Figure 1 ;

[0024] Figure 3 This is a schematic diagram of the interior of a frame cabinet according to one embodiment of this utility model. Figure 2 ;

[0025] The components include: 1. Connecting cabinet; 11. Heat dissipation device; 2. Frame cabinet; 21. Operating surface; 22. Maintenance surface; 23. Heat dissipation grille; 3. Frame circuit breaker; 31. Output copper busbar; 32. First connecting part; 33. Second connecting part; 34. Input copper busbar; 4. Molded case circuit breaker module; 41. Three-phase molded case circuit breaker; 5. First busbar group; 51. First busbar; 6. Second busbar group; 61. Second busbar; 7. Insulator; 8. First connecting copper busbar group; 81. U-shaped connector; 9. Second connecting copper busbar group. Detailed Implementation

[0026] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] In the description of this utility model, it should be understood that the terms "length", "middle", "upper", "lower", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "assembly," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] The following is combined Figures 1 to 3 This describes an H-type photovoltaic low-voltage combiner cabinet according to an embodiment of the present utility model.

[0031] An H-type photovoltaic low-voltage combiner cabinet includes a connecting cabinet 1 and a frame cabinet 2. The connecting cabinet 1 is equipped with parallel frame cabinets 2 at both ends. The connecting cabinet 1 and the frame cabinet 2 are connected. The connecting cabinet 1 is provided with a heat dissipation device 11. The operating surface 21 of the frame cabinet 2 is located away from the connecting cabinet 1, and the maintenance surface 22 of the frame cabinet 2 is located close to the connecting cabinet 1.

[0032] The frame cabinet 2 is equipped with a molded case circuit breaker module 4, a frame circuit breaker 3, a first busbar group 5, and a second busbar group 6; the length direction of the first busbar group 5 is vertical, and the length direction of the second busbar group 6 is front-to-back.

[0033] A frame circuit breaker 3 is provided on the top of the operating surface 21 of the frame cabinet 2. The input end of the frame circuit breaker 3 is connected to the top of the first busbar group 5. The operating surface 21 of the frame cabinet 2 is provided with multiple sets of molded case circuit breaker modules 4. The multiple sets of molded case circuit breaker modules 4 are all located below the frame circuit breaker 3 and arranged in a vertical direction. The molded case circuit breaker modules 4 are connected to the second busbar 61. The multiple molded case circuit breaker modules 4 correspond one-to-one with the multiple second busbars 61. The ends of the multiple second busbars 61 are respectively connected to the first busbar 51.

[0034] The first busbar group 5 and the second busbar group 6 are both located close to the maintenance surface 22 of the frame cabinet 2.

[0035] In this solution, the frame circuit breaker 3 and the molded case circuit breaker module 4 are positioned close to the operating surface 21, which facilitates quick identification and operation by the operator, improves the convenience and efficiency of operation, and effectively reduces the time wasted in searching for equipment.

[0036] The left and right ends of the connecting cabinet 1 are connected to two frame cabinets 2 respectively, forming an H-shaped photovoltaic low-voltage combiner cabinet. The maintenance surfaces 22 of the two frame cabinets 2 are arranged opposite each other, and a maintenance channel with fast heat dissipation is provided between the two maintenance surfaces 22, which runs through both ends. Placing the first busbar group 5 and the second busbar group 6, which generate a lot of heat, close to the maintenance surface 22 can not only prevent heat from directly radiating to the operating surface 21, thus avoiding the normal operation of the molded case circuit breaker module 4 and the frame circuit breaker 3, but also accelerate the conduction and diffusion of heat, reducing the risk of local overheating.

[0037] When the photovoltaic low-voltage combiner cabinet is operating, the heat inside the cabinet 1 is dissipated through the heat dissipation device 11. The molded case circuit breaker module 4 and the frame circuit breaker 3 are located in the operating surface 21. Since the heat generation of the molded case circuit breaker module 4 and the frame circuit breaker 3 is relatively small, the air near the operating surface 21 is less heated, forming a low-temperature zone. The heat generation of the first busbar group 5 and the second busbar group 6 is relatively large, and the air near the maintenance surface 22 is close to the heat source, forming a high-temperature zone. Therefore, the air flows naturally under the influence of temperature differences, flowing from the high-temperature zone to the low-temperature zone, thereby improving the heat dissipation effect of the photovoltaic low-voltage combiner cabinet.

[0038] In addition, compared to traditional combiner cabinets with limited maintenance space, the photovoltaic low-voltage combiner cabinet in this solution allows maintenance personnel to stand in the maintenance passage when a fault occurs or regular maintenance is required, and to quickly inspect, test and repair the first and second busbar groups 5 and 6 on both sides. This solves the problems of difficult maintenance and slow heat dissipation caused by the limited maintenance space in traditional combiner cabinets.

[0039] It is worth noting that the first busbar group 5 is arranged vertically, while the second busbar group 6 is arranged horizontally, making full use of the internal space of the frame cabinet 2, reducing the area occupied by the copper busbars, and improving the integration of the equipment. In addition, the current directions of the first busbar group 5 and the second busbar group 6 are perpendicular to each other, which ensures that the magnetic field directions generated by the first busbar group 5 and the second busbar group 6 are also perpendicular, significantly reducing the magnetic field coupling effect.

[0040] The molded case circuit breaker module 4 includes multiple three-phase molded case circuit breakers 41, which are arranged in a front-to-back direction.

[0041] The tops of the multiple three-phase molded case circuit breakers 41 are respectively connected to the second busbar group 6 via the first connecting copper busbar group 8, and the bottoms of the three-phase molded case circuit breakers 41 are connected to the insulators 7 via the second connecting copper busbar group 9. The insulators 7 are fixedly installed on the maintenance surface 22 of the frame cabinet 2.

[0042] The two adjacent insulators 7 are staggered.

[0043] By refining the molded case circuit breaker module 4 into several three-phase molded case circuit breakers 41, the current in each circuit can be controlled more precisely, improving the accuracy and reliability of current handling. Simultaneously, the parallel use of multiple three-phase molded case circuit breakers 41 can also increase the current carrying capacity of the entire combiner cabinet.

[0044] In this scheme, multiple three-phase molded case circuit breakers 41 are arranged in the front-to-back direction, so that a horizontal air channel is formed between two adjacent molded case circuit breaker modules, and heat can be diffused in the horizontal direction, avoiding heat accumulation in the vertical direction.

[0045] Insulator 7 is fixed to the maintenance surface 22, forming a clear electrical isolation barrier to prevent leakage and short circuit accidents, ensuring the personal safety of operators and the normal operation of equipment. Furthermore, the staggered arrangement of adjacent insulators 7 ensures that the magnetic field directions between adjacent insulators 7 are not parallel, effectively weakening the magnetic field coupling effect and reducing the impact of electromagnetic interference on signal transmission. The staggered arrangement of insulators 7 also increases the electrical clearance between adjacent insulators 7, reducing the risk of short circuits caused by dust, moisture, or electric arcs.

[0046] The first connecting copper busbar group 8 includes three C-shaped connectors 81, the opening of the C-shaped connectors 81 facing downwards, one end of the C-shaped connectors 81 being connected to the top of the three-phase molded case circuit breaker 41, and the other end of the C-shaped connectors 81 being connected to the top of the second busbar group 6.

[0047] Compared to traditional line contact or point contact, in this design, the U-shaped connector 81 is connected to the three-phase molded case circuit breaker 41, and the U-shaped connector 81 is connected to the second busbar 61 using surface contact. By increasing the contact surface, the reliability and performance of the electrical connection can be effectively improved.

[0048] The second busbar group 6 includes three second busbars 61, which are arranged in a left-right direction; the first busbar group 5 includes three first busbars 51, which are arranged in a front-back direction.

[0049] The three first busbars 51 correspond one-to-one with the three second busbars 61.

[0050] It is worth noting that the first busbar group 5 and the second busbar group 6 form an orthogonal magnetic field distribution, which effectively suppresses eddy currents and electromagnetic interference, and avoids the induced voltage and harmonic distortion caused by magnetic field coupling in the traditional parallel arrangement of copper busbars.

[0051] In addition, the orthogonal layout creates natural heat dissipation channels between adjacent copper busbars, allowing air to circulate and carry away heat, further improving the heat dissipation effect of the photovoltaic low-voltage combiner cabinet in this solution.

[0052] The connecting cabinet 1 is provided with an output copper busbar 31. The output copper busbar 31 includes a first connecting part 32 and a second connecting part 33 that are perpendicular to each other. The length direction of the first connecting part 32 is the left-right direction, and the length direction of the second connecting part 33 is the front-back direction. The first connecting part 32 is connected to the frame circuit breaker 3, and the front end of the second connecting part 33 extends out of the front side wall of the connecting cabinet 1.

[0053] The first connecting part 32 and the second connecting part 33 form a vertical structure, which can effectively reduce the space occupied by the output copper busbar 31 and improve the overall integration of the cabinet.

[0054] The front end of the second connecting part 33 protrudes through the front side wall of the connecting cabinet 1, so that the end is directly exposed to the external environment. This can significantly increase the heat dissipation surface area of ​​the copper busbar, and utilize the natural convection of ambient air for cooling, effectively reducing the temperature of the copper busbar end and avoiding the risk of performance degradation or failure due to local overheating.

[0055] The rear side wall of the frame cabinet 2 is provided with multiple heat dissipation grilles 23, which are arranged in a matrix.

[0056] The heat dissipation grille 23 is installed on the side wall of the frame cabinet 2 to ensure that the heat generated by the first busbar and the second busbar 61 can be discharged through the heat dissipation grille 23, thereby achieving local heat dissipation enhancement and reducing the risk of overheating of key components.

[0057] The heat dissipation device 11 is a centrifugal fan, and the heat dissipation device 11 is located on the rear side of the connecting cabinet 1.

[0058] Centrifugal fans generate high air pressure through high-speed rotation, which can force the hot air inside the cabinet to be discharged quickly, making the air flow inside the photovoltaic low-voltage combiner cabinet more uniform and the temperature distribution more consistent, thus avoiding performance fluctuations caused by local overheating.

[0059] An input copper busbar group is provided between the frame circuit breaker 3 and the first busbar group 5. The input copper busbar group includes three input copper busbars 34, which are obliquely connected to the frame circuit breaker 3 and the first busbar group 51.

[0060] The tilted design increases the surface area of ​​the input copper busbar 34, resulting in a larger heat dissipation area compared to a straight copper busbar. This effectively reduces the temperature of the output copper busbar 31 and improves the heat dissipation effect of the photovoltaic low-voltage combiner cabinet in this solution.

[0061] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. An H-type photovoltaic low-voltage combiner cabinet, characterized in that, It includes a connecting cabinet and a frame cabinet. The frame cabinets are installed at both ends of the connecting cabinet and are parallel to each other. The connecting cabinet is connected to the frame cabinet and is equipped with a heat dissipation device. The operating surface of the frame cabinet is located away from the connecting cabinet, and the maintenance surface of the frame cabinet is located close to the connecting cabinet. The frame cabinet is equipped with a molded case circuit breaker module, a frame circuit breaker, a first busbar group and a second busbar group; the length direction of the first busbar group is vertical, and the length direction of the second busbar group is front-to-back. A frame circuit breaker is installed at the top of the operating surface of the frame cabinet. The input end of the frame circuit breaker is connected to the top of the first busbar group. The operating surface of the frame cabinet is provided with multiple sets of molded case circuit breaker modules. The multiple sets of molded case circuit breaker modules are all located below the frame circuit breaker and arranged in a vertical direction. The molded case circuit breaker modules are connected to the second busbar. The multiple molded case circuit breaker modules correspond one-to-one with the multiple second busbars. The ends of the multiple second busbars are respectively connected to the first busbar. Both the first and second busbar groups are located close to the maintenance surface of the frame cabinet.

2. The H-type photovoltaic low-voltage combiner cabinet according to claim 1, characterized in that, The molded case circuit breaker module includes multiple three-phase molded case circuit breakers, which are arranged in a front-to-back direction. The tops of the multiple three-phase molded case circuit breakers are respectively connected to the second busbar group via a first connecting copper busbar group, and the bottoms of the three-phase molded case circuit breakers are connected to insulators via a second connecting copper busbar assembly. The insulators are fixedly installed on the maintenance surface of the frame cabinet. The adjacent insulators are arranged alternately.

3. The H-type photovoltaic low-voltage combiner cabinet according to claim 2, characterized in that, The first connecting copper busbar group includes three I-shaped connectors with their openings facing downwards. One end of each I-shaped connector is connected to the top of the three-phase molded case circuit breaker, and the other end of each I-shaped connector is connected to the top of the second busbar group.

4. The H-type photovoltaic low-voltage combiner cabinet according to claim 1, characterized in that, The second busbar group includes three second busbars, which are arranged in a left-right direction; the first busbar group includes three first busbars, which are arranged in a front-back direction. The three first busbars correspond one-to-one with the three second busbars.

5. The H-type photovoltaic low-voltage combiner cabinet according to claim 1, characterized in that, The connecting cabinet is equipped with an output copper busbar, which includes a first connecting part and a second connecting part that are perpendicular to each other. The length direction of the first connecting part is the left-right direction, and the length direction of the second connecting part is the front-back direction. The first connecting part is connected to the frame circuit breaker, and the front end of the second connecting part extends out of the front side wall of the connecting cabinet.

6. The H-type photovoltaic low-voltage combiner cabinet according to claim 1, characterized in that, The rear side wall of the frame cabinet is provided with multiple heat dissipation grilles, which are arranged in a matrix.

7. The H-type photovoltaic low-voltage combiner cabinet according to claim 1, characterized in that, The heat dissipation device is a centrifugal fan, and the heat dissipation device is located on the rear side of the connecting cabinet.

8. The H-type photovoltaic low-voltage combiner cabinet according to claim 4, characterized in that, An input copper busbar group is provided between the frame circuit breaker and the first busbar group. The input copper busbar group includes three input copper busbars, which are obliquely connected to the frame circuit breaker and the first busbar group.

Images