Photovoltaic low-voltage convergence cabinet

Abstract

A photovoltaic low-voltage confluence cabinet is characterized in that at least two molded case circuit breaker modules are arranged on a first operation surface of a frame cabinet body at intervals along a Z-axis direction, a molded case circuit breaker module is arranged on a second operation surface of the frame cabinet body, and a frame circuit breaker is arranged above the plurality of molded case circuit breaker modules; the XYX confluence copper bar group is arranged in the frame cabinet body in an extending mode along the X axis, the XYX confluence copper bar group is connected with the XYY confluence copper bar group arranged in an extending mode along the Y axis, the XYX confluence copper bar group is electrically connected with the XZX confluence copper bar group through the first connecting piece group, and the XYX confluence copper bar group, the XYY confluence copper bar group and the XZX confluence copper bar group are respectively provided with a molded case circuit breaker module. And the XYX bus copper bar group is electrically connected with the input end of the frame circuit breaker through the second connecting piece group. The frame cabinet body is divided into different areas in depth and height, and the molded case circuit breaker modules in different areas are converged and connected to the frame circuit breaker through the copper bar group and the connecting piece group, so that the height space and the depth space of the low-voltage convergence cabinet are fully utilized, and the space utilization rate is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a power transformation equipment technical field especially relates to a photovoltaic low pressure busbar cabinet. BACKGROUND

[0002] The photovoltaic power generation transformer substation, also known as the box type transformer substation, usually realizes the preassembled integration of the devices such as low voltage cabinet, transformer and ring network cabinet through the container. With the continuous development of the photovoltaic industry, the capacity of the transformer substation is getting larger and larger, and therefore the space utilization rate is getting higher and higher.

[0003] The low voltage cabinet in the transformer substation is mainly composed of branch switches (moulded case circuit breakers) and frame circuit breakers. The branch switches are connected with the AC output of the string type inverter and the frame circuit breakers, so as to realize the low voltage AC busbar connection. The number of branch switches in the low voltage cabinet determines the capacity of the transformer substation. In the prior art, in order to meet the capacity of the transformer substation, more branch switches are directly added, which leads to the increasing size of the low voltage cabinet and the unreasonable internal layout of the low voltage cabinet. SUMMARY

[0004] In view of the problems in the background art, the purpose of the utility model is to provide a photovoltaic low pressure busbar cabinet, which solves the problem of unreasonable internal branch switch layout of the existing low voltage cabinet.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] A photovoltaic low pressure busbar cabinet, comprising a frame cabinet body, a plurality of moulded case circuit breaker modules, a frame circuit breaker, an XYX busbar copper bar group, an XYY busbar copper bar group, at least one XZX busbar copper bar group, a first connecting piece group and a second connecting piece group;

[0007] At least two moulded case circuit breaker modules are arranged on the first operation surface of the frame cabinet body along the Z-axis direction, one moulded case circuit breaker module is arranged on the second operation surface of the frame cabinet body, the second operation surface is perpendicular to the first operation surface, and the frame circuit breaker is arranged above the plurality of moulded case circuit breaker modules;

[0008] The XYX busbar copper bar group is arranged close to the back of the interior of the frame cabinet body, the length direction of the XYX busbar copper bar group extends along the X-axis, one end of the XYX busbar copper bar group is connected with the XYY busbar copper bar group, the length direction of the XYY busbar copper bar group extends along the Y-axis, the XYX busbar copper bar group is electrically connected with the XZX busbar copper bar group through the first connecting piece group, and the XZX busbar copper bar group is located directly below the region between the XYX busbar copper bar group and the first operation surface;

[0009] The XYX busbar group, the XYY busbar group, and the XZX busbar group are respectively independently installed with the molded case circuit breaker modules, and the XYX busbar group is electrically connected to the input end of the frame circuit breaker through the second connector group.

[0010] Preferably, the molded case circuit breaker module includes a plurality of three-phase molded case circuit breakers;

[0011] The XYX busbar set includes three XYX busbars, the surface of the XYX busbars is parallel to the XY plane, and the three XYX busbars are arranged at intervals along the Z axis direction;

[0012] The XYY busbar set includes three XYY busbars, the surface of the XYY busbars is parallel to the XY plane, and the three XYY busbars are spaced apart along the Z-axis direction;

[0013] The XZX busbar set includes three XZX busbars, the surface of the XZX busbar is parallel to the XZ plane, the length direction of the XZX busbar extends along the X-axis, and the three XZX busbars are arranged at intervals along the Y direction.

[0014] Preferably, the first connecting member group includes three first connecting members, and the three first connecting members are arranged at intervals along the Y-axis direction;

[0015] The first connecting member includes a vertical connecting section and a 匚-shaped connecting section, the vertical connecting section extends along the Z-axis direction, the top of the vertical connecting section is connected to the bottom end of the 匚-shaped connecting section, the bottom of the vertical connecting section is connected to the XZX bus copper bus, the top of the 匚-shaped connecting section is connected to the XYX bus copper bus, and the opening of the 匚-shaped connecting section faces the first operating surface.

[0016] Preferably, the 匚-shaped connecting section comprises an upper horizontal section, a vertical section and a lower horizontal section, and the upper horizontal section and the lower horizontal section are respectively provided at the upper and lower ends of the vertical section;

[0017] The three lower horizontal sections are all located below the XYX busbar group, the three upper horizontal sections are respectively connected to three XYX busbars, and the lengths of the three vertical sections increase by the same value, and the increase in the length is the spacing distance between two adjacent XYX busbars.

[0018] Preferably, the second connecting member group includes three L-shaped second connecting members, and the three second connecting members are arranged at intervals along the X-axis direction;

[0019] The second connecting piece comprises a horizontal connecting section and a vertical connecting section, the bottom end of the vertical connecting section is connected with the horizontal connecting section, the horizontal connecting section is connected with the XYX busbar group, and the vertical connecting section is connected with the input end.

[0020] Preferably, the several three-phase molded case circuit breakers connected with the XYX busbar group are upper-layer molded case circuit breakers, the upper-layer molded case circuit breakers are arranged at intervals along the X-axis direction, the bottom of the upper-layer molded case circuit breaker is provided with a first incoming copper bar, and the top of the upper-layer molded case circuit breaker is provided with a first outgoing copper bar, the first incoming copper bar is used for connecting with an external inverter, and the first outgoing copper bar is connected with the XYX busbar group.

[0021] The several three-phase molded case circuit breakers connected with the XZX busbar group are lower-layer molded case circuit breakers, the lower-layer molded case circuit breakers are arranged at intervals along the X-axis direction, the bottom of the lower-layer molded case circuit breaker is provided with a second incoming copper bar, and the top of the lower-layer molded case circuit breaker is provided with a second outgoing copper bar, the second incoming copper bar is used for connecting with an external inverter, and the second outgoing copper bar is connected with the XZX busbar group.

[0022] The several three-phase molded case circuit breakers connected with the XYY busbar group are side molded case circuit breakers, the side molded case circuit breakers are arranged at intervals along the Y-axis direction, the bottom of the side molded case circuit breaker is provided with a third incoming copper bar, and the top of the side molded case circuit breaker is provided with a third outgoing copper bar, the third incoming copper bar is used for connecting with an external inverter, and the third outgoing copper bar is connected with the XYY busbar group.

[0023] Preferably, the first incoming copper bar is in the shape of “Z”, the first incoming copper bar comprises a first leading-in section, a first incoming horizontal section and a first incoming connecting section, the first leading-in section and the first incoming connecting section are respectively vertically arranged at two ends of the first incoming horizontal section, the first leading-in section is connected with the input end of the upper-layer molded case circuit breaker, and the first incoming connecting section is connected with the inverter.

[0024] The second outgoing copper bar is in the shape of “Fang”, the second outgoing copper bar comprises a second leading-out section, a second outgoing horizontal section and a second outgoing connecting section, the second leading-out section and the second outgoing connecting section are respectively vertically arranged at two ends of the second outgoing horizontal section, the second leading-out section is connected with the output end of the lower-layer molded case circuit breaker, and the second outgoing connecting section is connected with the XZX busbar group.

[0025] The length H1 of the first incoming connecting section is greater than the length H2 of the second outgoing connecting section, and the length L1 of the first incoming horizontal section is greater than the length L2 of the second outgoing horizontal section.

[0026] Preferably, the third outgoing copper bar comprises a third outgoing section, a third inclined section and a third connecting section, the third outgoing section is connected with the lower end of the third inclined section vertically, the third connecting section is connected with the upper end of the third inclined section horizontally, the third inclined section is inclined backward relative to the side molded case circuit breaker, the third outgoing section is connected with the output end of the side molded case circuit breaker, and the third connecting section is connected with the XYY bus copper bar group.

[0027] Preferably, two frame circuit breakers are arranged, two XYX bus copper bar groups are arranged, two XYY bus copper bar groups are arranged, at least two XZX bus copper bar groups are arranged, two first connecting piece groups are arranged, and two second connecting piece groups are arranged.

[0028] The two frame circuit breakers, the two XYX bus copper bar groups, the two XYY bus copper bar groups, the two XZX bus copper bar groups, the two first connecting piece groups and the two second connecting piece groups are symmetrically arranged in the interior of the frame cabinet body.

[0029] The two XYY bus copper bar groups are respectively arranged on the left side and the right side of the frame cabinet body.

[0030] Preferably, a voltage transformer and a surge protector are further arranged in the interior of the frame cabinet body.

[0031] The frame cabinet body comprises an openable and closable shell.

[0032] Compared with the prior art, one of the above technical solutions has the following beneficial effects:

[0033] 1. By dividing the frame cabinet body in depth and height into different regions, the molded case circuit breaker modules in different regions are connected to the frame circuit breaker through the copper bar groups (the XYX bus copper bar group, the XYY bus copper bar group and the XZX bus copper bar group) and the connecting piece groups (the first connecting piece group and the second connecting piece group), the height space and the depth space of the low-voltage bus cabinet are fully utilized, and the space utilization rate is improved. At the same time, the molded case circuit breaker modules can be flexibly configured according to actual needs, and the flexibility of the system is improved.

[0034] 2. Under the same capacity, a large amount of copper bar is saved compared with other low-voltage bus cabinets; and by arranging two heat exchangers on the shell, the heat dissipation capacity of the bus cabinet is greatly improved, and the performance of the box transformer is improved. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a structural schematic diagram of one embodiment of the utility model;

[0036] Figure 2 is a front view (not containing the frame cabinet body) of one embodiment of the utility model.

[0037] Figure 3 is a frame circuit breaker, a molded case circuit breaker module, an XYX bus copper bar group and an XYY bus copper bar group structure schematic diagram of the utility model;

[0038] Figure 4 is another angle of the schematic diagram of Figure 3 ;

[0039] Figure 5 is a frame circuit breaker, a molded case circuit breaker module, an XYX bus copper bar group, an XYY bus copper bar group and an XZX bus copper bar group structure schematic diagram of the utility model;

[0040] Figure 6 is another angle of the schematic diagram of Figure 5 .

[0041] Wherein: frame cabinet body 1, first operation surface 11, second operation surface 12, molded case circuit breaker module 2, three-phase molded case circuit breaker 200, upper layer molded case circuit breaker 210, first incoming line copper bar 211, first incoming line horizontal section 2111, first incoming line connecting section 2112, first outgoing line copper bar 212, lower layer molded case circuit breaker 220, second incoming line copper bar 221, second outgoing line copper bar 222, second outgoing line horizontal section 2221, second outgoing line connecting section 2222, side molded case circuit breaker 230, third incoming line copper bar 231, third outgoing line copper bar 232, third leading-out section 2321, third inclined section 2322, third connecting section 2323, frame circuit breaker 3, input end 31, XYX bus copper bar group 4, XYX bus copper bar 41, XYY bus copper bar group 5, XYY bus copper bar 51, XZX bus copper bar group 6, XZX bus copper bar 61, first connecting piece group 7, vertical connecting section 71, L-shaped connecting section 72, upper horizontal section 721, vertical section 722, lower horizontal section 723, second connecting piece group 8, horizontal connecting section 81 and vertical connecting section 82. DETAILED DESCRIPTION

[0042] The embodiments of the utility model are described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.

[0043] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model.

[0044] In addition, the terms "first", "second", and "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0045] It should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", and "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0046] The utility model is described below in conjunction with the accompanying Figures 1 to 6 The technical scheme of the utility model is further illustrated by the specific embodiments.

[0047] In a photovoltaic power station, a low-voltage cabinet as a key device for power collection, distribution and protection is installed in a substation. Specifically, the direct current generated by each photovoltaic module is first converted into alternating current by an inverter, and these alternating currents are connected to the incoming copper bar of the molded case circuit breaker in the low-voltage cabinet through specific cables or terminal connections. The molded case circuit breaker, as a protection element of the circuit, can monitor and control the incoming current to ensure that the circuit can be quickly disconnected when overloaded, short-circuited or grounded, protecting the safety of the circuit and equipment. The outgoing copper bar of the molded case circuit breaker collects power to the frame circuit breaker, which serves as the main switch to control the on-off of the entire circuit and has higher breaking capacity and short-circuit protection capacity. The power collected to the frame circuit breaker is delivered to the low-voltage side of the transformer, which raises the voltage to a level suitable for transmission on the power grid, and then delivered to the power grid through high-voltage lines.

[0048] The utility model provides a kind of photovoltaic low-voltage busbar cabinet, including frame cabinet body 1, several molded case circuit breaker modules 2, frame circuit breaker 3, XYX busbar group 4, XYY busbar group 5, at least one XZX busbar group 6, first connecting piece group 7 and second connecting piece group 8;

[0049] The first operation surface 11 of the frame cabinet 1 is provided with at least two plastic case circuit breaker modules 2 arranged at intervals along the Z-axis direction, and the second operation surface 12 of the frame cabinet 1 is provided with one plastic case circuit breaker module 2, wherein the second operation surface 12 is perpendicular to the first operation surface 11, and the frame circuit breaker 3 is arranged above the plastic case circuit breaker modules 2.

[0050] The XYX bus copper bar group 4 is arranged close to the back of the interior of the frame cabinet 1, the length direction of the XYX bus copper bar group 4 extends along the X-axis, one end of the XYX bus copper bar group 4 is connected with the XYY bus copper bar group 5, the length direction of the XYY bus copper bar group 5 extends along the Y-axis, the XYX bus copper bar group 4 is electrically connected with the XZX bus copper bar group 6 through the first connecting piece group 7, and the XZX bus copper bar group 6 is located directly below the region between the XYX bus copper bar group 4 and the first operation surface 11.

[0051] The XYX bus copper bar group 4, the XYY bus copper bar group 5 and the XZX bus copper bar group 6 are respectively provided with the plastic case circuit breaker module 2, and the XYX bus copper bar group 4 is electrically connected with the input end 31 of the frame circuit breaker 3 through the second connecting piece group 8.

[0052] Preferably, the XYY bus copper bar group 5 is connected with the XYX bus copper bar group 4 perpendicularly. The utility model sets the plastic case circuit breaker modules 2 on two vertical operation surfaces (namely the first operation surface 11 and the second operation surface 12) of the frame cabinet 1, effectively utilizes the depth space (the Y-axis direction) of the frame cabinet 1. In addition, at least two plastic case circuit breaker modules 2 are arranged at intervals along the vertical direction on the first operation surface 11, effectively utilizes the height space (the Z-axis direction) of the frame cabinet 1, and fully utilizes the three-dimensional space in the interior of the frame cabinet 1. The plastic case circuit breaker modules 2 located below share the XYX bus copper bar group 4 with the plastic case circuit breaker modules 2 located above through the first connecting piece group 7, and the input end 31 of the frame circuit breaker 3 is electrically connected with the plastic case circuit breaker modules 2 through the XYX bus copper bar group 4, thereby saving the independent connection between the plastic case circuit breaker modules 2 and the frame circuit breaker 3, avoiding the complexity of internal connection, reducing the volume expansion problem of the traditional low-voltage cabinet caused by simply adding the plastic case circuit breaker, and realizing the simplified installation of multiple plastic case circuit breaker modules 2 in the vertical height, thereby improving the utilization rate of the internal space of the low-voltage cabinet.

[0053] Further, the plastic case circuit breaker module 2 comprises a plurality of three-phase plastic case circuit breakers 200.

[0054] The XYX bus copper bar group 4 includes three XYX bus copper bars 41, the plate surface of the XYX bus copper bar 41 is parallel to the XY plane, and the three XYX bus copper bars 41 are arranged along the Z-axis direction at intervals;

[0055] The XYY bus copper bar group 5 includes three XYY bus copper bars 51, the plate surface of the XYY bus copper bar 51 is parallel to the XY plane, and the three XYY bus copper bars 51 are arranged along the Z-axis direction at intervals;

[0056] The XZX bus copper bar group 6 includes three XZX bus copper bars 61, the plate surface of the XZX bus copper bar 61 is parallel to the XZ plane, the length direction of the XZX bus copper bar 61 extends along the X-axis direction, and the three XZX bus copper bars 61 are arranged along the Y direction at intervals.

[0057] By refining the molded case circuit breaker module 2 into several three-phase molded case circuit breakers 200, the current of each loop can be more accurately controlled, and the accuracy and reliability of current processing can be improved. At the same time, the parallel use of multiple three-phase molded case circuit breakers 200 can also improve the current carrying capacity of the entire bus cabinet.

[0058] The XYX bus copper bar group 4, the XYY bus copper bar group 5 and the XZX bus copper bar group 6 each include three copper bars, and the three copper bars of each copper bar group correspond to the three-phase circuit connection of the three-phase molded case circuit breaker 200.

[0059] Further, the XZX bus copper bar group 6 is located directly below the region between the XYX bus copper bar group 4 and the first operation surface 11. Specifically, although the XZX bus copper bar group 6 and the XYX bus copper bar group 4 are both used to connect with the two molded case circuit breaker modules 2 arranged on the first operation surface 11, the three XZX bus copper bars 61 are arranged along the Y-axis direction at intervals, rather than like the three XYX bus copper bars 41 arranged along the Z-axis direction at intervals, which makes full use of the depth (Y-axis direction) of the frame cabinet 1, and avoids increasing the vertical height of the cabinet.

[0060] In addition, the three XZX bus copper bars 61 are arranged along the Y-axis direction at intervals, so that there is a spacing space along the Z-axis direction between adjacent XZX bus copper bars 61, which is beneficial to heat dissipation inside.

[0061] Further, the first connecting piece group 7 includes three first connecting pieces, and the three first connecting pieces are arranged along the Y-axis direction at intervals;

[0062] The first connecting piece comprises a vertical connecting section 71 and a U-shaped connecting section 72. The vertical connecting section 71 extends along the Z-axis direction. The top end of the vertical connecting section 71 is connected with the bottom end of the U-shaped connecting section 72. The bottom of the vertical connecting section 71 is connected with the XZX bus copper bar 61. The top of the U-shaped connecting section 72 is connected with the XYX bus copper bar 41. The opening of the U-shaped connecting section 72 faces the first operation surface 11.

[0063] The vertical connecting section 71 extends along the Z-axis direction (vertical direction). The bottom of the vertical connecting section 71 is connected with the XZX bus copper bar 61. The top of the vertical connecting section 71 is connected with the U-shaped connecting section 72. The U-shaped connecting section 72 is connected with the XYX bus copper bar 41 above it. The opening of the U-shaped connecting section 72 faces the first operation surface 11. The three-phase molded case circuit breaker 200 connected with the XYX bus copper bar 41 is avoided by the opening of the U-shaped connecting section 72, so as to avoid the cross of the electrical lines.

[0064] Further, the U-shaped connecting section 72 comprises an upper horizontal section 721, a vertical section 722 and a lower horizontal section 723. The upper horizontal section 721 and the lower horizontal section 723 are respectively arranged at the upper and lower ends of the vertical section 722.

[0065] The three lower horizontal sections 723 are below the XYX bus copper bar group 4. The three upper horizontal sections 721 are respectively connected with the three XYX bus copper bars 41. The lengths of the three vertical sections 722 are equal and increase. The increase value of the length is equal to the interval distance between the adjacent two XYX bus copper bars 41.

[0066] By ensuring that the lengths of the three vertical sections 722 are equal and increase, and the increase value is equal to the interval distance between the adjacent two XYX bus copper bars 41, the accurate matching between the U-shaped connecting section 72 of the three first connecting pieces and the XYX bus copper bar 41 is realized. This not only improves the stability and reliability of the connection, but also reduces the current transmission loss caused by the mismatch of the interval.

[0067] Further, the second connecting piece group 8 comprises three L-shaped second connecting pieces. The three second connecting pieces are arranged along the X-axis direction.

[0068] The second connecting piece comprises a horizontal connecting section 81 and a vertical connecting section 82. The bottom end of the vertical connecting section 82 is connected with the horizontal connecting section 81. The horizontal connecting section 81 is connected with the XYX bus copper bar 41. The vertical connecting section 82 is connected with the input end 31.

[0069] The second connecting piece in L shape realizes the stable connection between the XYX bus copper bar 41 and the input end 31 of the frame circuit breaker 3 through the combination of the horizontal connecting section 81 and the vertical connecting section 82. This design not only improves the strength and stability of the connection, but also effectively resists deformation and displacement caused by current and mechanical stress. The L-shaped second connecting piece design is compact and occupies less space, making the internal layout of the entire busbar cabinet more reasonable and efficient. This design not only improves space utilization, but also provides more convenience for subsequent maintenance and upgrades.

[0070] The second connecting piece in L shape not only connects the XYX bus copper bar 41 and the input end 31 of the frame circuit breaker 3, but also forms certain heat dissipation channels through the spacing. Under high current load, these heat dissipation channels can accelerate heat dissipation, reduce equipment temperature, and improve equipment stability and life.

[0071] Further, the several three-phase molded case circuit breakers 200 connected with the XYX bus copper bar group 4 are upper-layer molded case circuit breakers 210, which are arranged along the X-axis direction at intervals, and the bottom of the upper-layer molded case circuit breaker 210 is provided with a first incoming line copper bar 211, and the top of the upper-layer molded case circuit breaker 210 is provided with a first outgoing line copper bar 212, the first incoming line copper bar 211 is used to connect with the external inverter, and the first outgoing line copper bar 212 is connected with the XYX bus copper bar group 4.

[0072] The several three-phase molded case circuit breakers 200 connected with the XZX bus copper bar group 6 are lower-layer molded case circuit breakers 220, which are arranged along the X-axis direction at intervals, and the bottom of the lower-layer molded case circuit breaker 220 is provided with a second incoming line copper bar 221, and the top of the lower-layer molded case circuit breaker 220 is provided with a second outgoing line copper bar 222, the second incoming line copper bar 221 is used to connect with the external inverter, and the second outgoing line copper bar 222 is connected with the XZX bus copper bar group 6.

[0073] The several three-phase molded case circuit breakers 200 connected with the XYY bus copper bar group 5 are side molded case circuit breakers 230, which are arranged along the Y-axis direction at intervals, and the bottom of the side molded case circuit breaker 230 is provided with a third incoming line copper bar 231, and the top of the side molded case circuit breaker 230 is provided with a third outgoing line copper bar 232, the third incoming line copper bar 231 is used to connect with the external inverter, and the third outgoing line copper bar 232 is connected with the XYY bus copper bar group 5.

[0074] By dividing the molded case circuit breaker into upper layer, lower layer and lateral arrangement, independent power supply and control of different bus copper bar groups are realized. The layered and lateral layout enables the molded case circuit breaker and the bus copper bar group to be arranged more compactly in the busbar cabinet, improving space utilization.

[0075] Each molded case circuit breaker is equipped with independent incoming and outgoing copper bars, ensuring stable and reliable transmission of current to the corresponding bus copper bar group, improving the current distribution capacity of the entire bus cabinet. By increasing or decreasing the number of molded case circuit breakers, the capacity and current distribution capacity of the bus cabinet can be easily adjusted to adapt to photovoltaic power generation systems of different scales and needs.

[0076] It is worth noting that the molded case circuit breaker corresponds to a three-phase circuit, so each incoming and outgoing copper bar has three corresponding ones. Specifically, the incoming copper bar of phase A corresponds to the outgoing copper bar of phase A, and the outgoing copper bar of phase A corresponds to the bus copper bar connected to phase A (XYX bus copper bar 41, XYY bus copper bar 51, and XZX bus copper bar 61). The following text will not be repeated.

[0077] Further, the first incoming copper bar 211 is in the shape of a "Z", and it includes a first incoming segment, a first incoming horizontal segment 2111, and a first incoming connecting segment 2112. The first incoming segment and the first incoming connecting segment 2112 are respectively vertically arranged at both ends of the first incoming horizontal segment 2111. The first incoming segment is connected to the input end of the upper molded case circuit breaker 210, and the first incoming connecting segment 2112 is connected to the inverter.

[0078] The second outgoing copper bar 222 is in the shape of a "Fang", and it includes a second outgoing segment, a second outgoing horizontal segment 2221, and a second outgoing connecting segment 2222. The second outgoing segment and the second outgoing connecting segment 2222 are respectively vertically arranged at both ends of the second outgoing horizontal segment 2221. The second outgoing segment is connected to the output end of the lower molded case circuit breaker 220, and the second outgoing connecting segment 2222 is connected to the XZX bus copper bar group 6.

[0079] The length H1 of the first incoming connecting segment 2112 is greater than the length H2 of the second outgoing connecting segment 2222, and the length L1 of the first incoming horizontal segment 2111 is greater than the length L2 of the second outgoing horizontal segment 2221.

[0080] The first incoming copper bar 211 adopts a "Z" shape design, which makes the copper bar layout more compact and effectively saves space. At the same time, the "Z" shape design also provides a better electrical connection path, which helps to reduce the loss in the current transmission process.

[0081] The second outgoing copper bar 222 adopts a "Fang" shape design, which can effectively enhance the mechanical strength and stability of the copper bar, making it more firmly connected to the relevant equipment and reducing the loosening or failure caused by vibration or external force.

[0082] Further, by adjusting the size of the first incoming copper bar 211 and the second outgoing copper bar 222, the compact and orderly connection between different MCB modules inside the cabinet is ensured. Specifically, since the lower MCB 220 is located below the upper MCB 210, and the electrical energy of all MCBs is input from the bottom incoming copper bar and output from the top outgoing copper bar, the connection position of the lower MCB 220 with the external device (inverter) can be directly set below it; accordingly, the connection position of the upper MCB 210 with the external device needs to be adjusted, and the connection position is "migrated" to the rear of the connection position of the lower MCB 220 with the external device through the "Z" shaped first incoming copper bar 211. At the same time, in order to ensure the setting of the outgoing copper bar of the lower MCB 220, the second outgoing copper bar 222 is set in the shape of "Dang", and the length H1 (equivalent to the extension height in the Z axis direction) of the first incoming connection section 2112 is greater than the length H2 (equivalent to the extension height in the Z axis direction) of the second outgoing connection section 2222, and the length L1 (equivalent to the extension distance in the Y axis direction) of the first incoming horizontal section 2111 is greater than the length L2 (equivalent to the extension distance in the Y axis direction) of the second outgoing horizontal section 2221, so that the first incoming copper bar 211 "wraps" the second outgoing copper bar 222.

[0083] Further, the third outgoing copper bar 232 comprises a third leading section 2321, a third inclined section 2322 and a third connecting section 2323, the third leading section 2321 is vertically connected with the lower end of the third inclined section 2322, the third connecting section 2323 is horizontally connected with the upper end of the third inclined section 2322, the third inclined section 2322 is inclined backward relative to the side MCB 230, the third leading section 2321 is connected with the output end of the side MCB 230, and the third connecting section 2323 is connected with the XYY bus copper bar group 5.

[0084] The special design of the third outgoing copper bar 232 makes the installation process more convenient and fast. The inclined third inclined section 2322 and the horizontal third connecting section 2323 provide more operating space for the installer, reducing the installation difficulty. At the same time, this design also facilitates subsequent maintenance and repair work, reducing maintenance cost and time.

[0085] Further, the frame circuit breaker 3 is provided with two, the XYX bus copper bar group 4 is provided with two, the XYY bus copper bar group 5 is provided with two, the XZX bus copper bar group 6 is provided with at least two, the first connecting piece group 7 is provided with two, and the second connecting piece group 8 is provided with two.

[0086] Two frame circuit breakers 3, two XYX bus copper bar groups 4, two XYY bus copper bar groups 5, two XZX bus copper bar groups 6, two first connecting piece groups 7 and two second connecting piece groups 8 are respectively arranged in the interior of the frame cabinet 1 in left-right symmetry.

[0087] Two XYY bus copper bar groups 5 are respectively arranged on the left and right sides of the frame cabinet 1.

[0088] By increasing the number of frame circuit breakers 3, the current carrying capacity and short circuit protection capability of the photovoltaic low-voltage busbar cabinet can be significantly improved, thereby adapting to larger scale photovoltaic power generation systems. Correspondingly, each frame circuit breaker 3 is configured with corresponding XYX bus copper bar group 4, XYY bus copper bar group 5 and XZX bus copper bar group 6 for installing three-phase molded case circuit breaker 200, which not only increases the flexibility of current distribution, but also improves the redundancy and reliability of the system. Two sets of low-voltage systems can operate simultaneously or separately to ensure stable operation of the system.

[0089] The left-right symmetry arrangement of these components not only makes the layout of the entire busbar cabinet more balanced and beautiful, but also improves the utilization rate of the internal space, helps to reduce unnecessary space waste, and makes the busbar cabinet more compact and efficient. The XYY bus copper bar group 5 (side molded case circuit breaker 230) is arranged on the left and right sides of the frame cabinet 1, which helps to improve the maintenance efficiency.

[0090] Further, the interior of the frame cabinet 1 is also provided with a voltage transformer and a surge protector;

[0091] The frame cabinet 1 comprises a shell which can be opened and closed.

[0092] The photovoltaic low-voltage busbar cabinet of the utility model can also flexibly add electrical elements such as voltage transformers, current transformers and surge protectors. The addition of the voltage transformer (PT) enables the photovoltaic low-voltage busbar cabinet to accurately measure and monitor the voltage in the circuit. Through the voltage transformer (PT), the operator can real-time understand the fluctuation of the power grid voltage, timely find the voltage anomaly, and thus take corresponding protection measures to ensure the safe operation of the photovoltaic power station. Further, the external data collector and the surge protector can be connected with the molded case circuit breaker in the molded case circuit breaker module (the connected molded case circuit breaker is not connected with the bus copper bar), the data collector can real-time collect and record various data in the circuit, such as voltage, current, power and the like; the surge protector provides effective lightning protection and overvoltage protection for the entire electrical system, through mutual cooperation, not only ensures the accuracy and integrity of the data, but also improves the safety and reliability of the electrical system.

[0093] In addition, the frame cabinet body 1 is further provided with a shell capable of opening and closing the frame cabinet body 1, the shell provides effective protection for electrical elements inside the cabinet, prevents dust, moisture and other pollutants from entering the inside of the cabinet, and avoids damage to the electrical elements. At the same time, the shell also has certain impact resistance and shock resistance, and can protect the internal electrical elements to normally operate in harsh environments.

[0094] Preferably, a heat exchanger can be further arranged outside the shell for heat exchange inside the frame cabinet body 1.

[0095] Preferably, the photovoltaic low-voltage combiner cabinet of the utility model is an outdoor cabinet, with a waterproof grade of IP54 and a corrosion resistance grade of C4-H.

[0096] The low-voltage combiner cabinet of the utility model has reasonable layout and design, and the structure of the entire low-voltage cabinet is more compact and stable. The compact structure not only saves space, improves the integration and efficiency of the electrical system, but also is convenient for daily maintenance and expansion and upgrading. This will help promote the development of the photovoltaic industry and the modernization of the photovoltaic power station, and improve the overall performance and energy efficiency of the photovoltaic power station.

[0097] The technical principle of the utility model is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the utility model, and cannot be explained as a limitation on the protection scope of the utility model in any way. Based on the explanation herein, those skilled in the art can think of other specific embodiments of the utility model without creative labor, and these embodiments will fall within the protection scope of the utility model.

Claims

1. A photovoltaic low-voltage combiner cabinet, characterized by: It comprises a frame cabinet (1), a plurality of molded case circuit breaker modules (2), a frame circuit breaker (3), an XYX busbar group (4), an XYY busbar group (5), at least one XZX busbar group (6), a first connector group (7), and a second connector group (8); The first operating surface (11) of the frame cabinet (1) is provided with at least two molded case circuit breaker modules (2) arranged at intervals along the Z-axis direction, the second operating surface (12) of the frame cabinet (1) is provided with one molded case circuit breaker module (2), the second operating surface (12) and the first operating surface (11) are perpendicular to each other, and the frame circuit breaker (3) is provided above the plurality of molded case circuit breaker modules (2); The XYX busbar group (4) is arranged near the back of the interior of the frame cabinet (1), the length direction of the XYX busbar group (4) extends along the X-axis, one end of the XYX busbar group (4) is connected to the XYY busbar group (5), the length direction of the XYY busbar group (5) extends along the Y-axis, the XYX busbar group (4) is electrically connected to the XZX busbar group (6) through the first connector group (7), and the XZX busbar group (6) is located directly below the area between the XYX busbar group (4) and the first operating surface (11); The XYX busbar group (4), the XYY busbar group (5), and the XZX busbar group (6) are each independently mounted with the molded case circuit breaker module (2), and the XYX busbar group (4) is electrically connected to the input end (31) of the frame circuit breaker (3) via the second connector group (8).

2. The photovoltaic low-voltage combiner cabinet according to claim 1, characterized in that: The molded case circuit breaker module (2) comprises a plurality of three-phase molded case circuit breakers (200); The XYX busbar group (4) includes three XYX busbars (41), the surface of the XYX busbars (41) is parallel to the XY plane, and the three XYX busbars (41) are arranged at intervals along the Z-axis direction; The XYY busbar group (5) includes three XYY busbars (51), the surface of the XYY busbars (51) is parallel to the XY plane, and the three XYY busbars (51) are arranged at intervals along the Z-axis direction; The XZX busbar group (6) comprises three XZX busbars (61), the plate surface of the XZX busbars (61) is parallel to the XZ plane, the length direction of the XZX busbars (61) extends along the X-axis direction, and the three XZX busbars (61) are arranged at intervals along the Y direction.

3. The photovoltaic low-voltage combiner cabinet according to claim 2, characterized in that: The first connecting member group (7) comprises three first connecting members, and the three first connecting members are arranged at intervals along the Y-axis direction; The first connecting member includes a vertical connecting section (71) and a U-shaped connecting section (72). The vertical connecting section (71) extends along the Z-axis direction. The top end of the vertical connecting section (71) is connected to the bottom end of the U-shaped connecting section (72). The bottom of the vertical connecting section (71) is connected to the XZX busbar (61). The top of the U-shaped connecting section (72) is connected to the XYX busbar (41). The opening of the U-shaped connecting section (72) faces the first operation surface (11).

4. The photovoltaic low-voltage combiner cabinet according to claim 3, characterized in that: The U-shaped connecting section (72) includes an upper horizontal section (721), a vertical section (722), and a lower horizontal section (723). The upper horizontal section (721) and the lower horizontal section (723) are respectively provided at the upper and lower ends of the vertical section (722). All three lower horizontal sections (723) are located below the XYX busbar group (4). The three upper horizontal sections (721) are respectively connected to the three XYX busbars (41). The lengths of the three vertical sections (722) increase equally, and the increased value of the length is the spacing distance between adjacent two XYX busbars (41).

5. The photovoltaic low-voltage combiner cabinet according to claim 2, characterized in that: The second connecting member group (8) includes three L-shaped second connecting members, which are arranged at intervals along the X-axis direction. The second connecting member includes a horizontal connecting section (81) and a vertical connecting section (82). The bottom end of the vertical connecting section (82) is connected to the horizontal connecting section (81). The horizontal connecting section (81) is connected to the XYX busbar (41). The vertical connecting section (82) is connected to the input terminal (Y31).

6. A photovoltaic low-voltage combiner cabinet according to any one of claims 3 or 5, characterized in that: A number of the three-phase molded case circuit breakers (200) connected to the XYX busbar group (4) are upper-layer molded case circuit breakers (210). The upper-layer molded case circuit breakers (210) are arranged at intervals along the X-axis direction. A first incoming line busbar (211) is provided at the bottom of the upper-layer molded case circuit breakers (210). A first outgoing line busbar (212) is provided at the top of the upper-layer molded case circuit breakers (210). The first incoming line busbar (211) is used to connect to an external inverter. The first outgoing line busbar (212) is connected to the XYX busbar group (4). A number of the three-phase molded case circuit breakers (200) connected to the XZX busbar group (6) are lower-layer molded case circuit breakers (220). The lower-layer molded case circuit breakers (220) are arranged at intervals along the X-axis direction. A second incoming line busbar (221) is provided at the bottom of the lower-layer molded case circuit breakers (220). A second outgoing line busbar (222) is provided at the top of the lower-layer molded case circuit breakers (220). The second incoming line busbar (221) is used to connect to an external inverter. The second outgoing line busbar (222) is connected to the XZX busbar group (6). A number of the three-phase molded case circuit breakers (200) connected to the XYY busbar group (5) are side molded case circuit breakers (230). The side molded case circuit breakers (230) are arranged at intervals along the Y-axis direction. A third incoming line busbar (231) is provided at the bottom of the side molded case circuit breaker (230), and a third outgoing line busbar (232) is provided at the top of the side molded case circuit breaker (230). The third incoming line busbar (231) is used to connect to an external inverter, and the third outgoing line busbar (232) is connected to the XYY busbar group (5).

7. The photovoltaic low-voltage combiner cabinet according to claim 6, characterized in that: The first incoming line busbar (211) is in a "Z" shape. The first incoming line busbar (211) includes a first introducing section, a first incoming line horizontal section (2111), and a first incoming line connecting section (2112). The first introducing section and the first incoming line connecting section (2112) are respectively vertically provided at both ends of the first incoming line horizontal section (2111). The first introducing section is connected to the input end of the upper-layer molded case circuit breaker (210), and the first incoming line connecting section (2112) is connected to the inverter; The second outgoing line busbar (222) is in a "匚" shape. The second outgoing line busbar (222) includes a second leading-out section, a second outgoing line horizontal section (2221), and a second outgoing line connecting section (2222). The second leading-out section and the second outgoing line connecting section (2222) are respectively vertically provided at both ends of the second outgoing line horizontal section (2221). The second leading-out section is connected to the output end of the lower-layer molded case circuit breaker (220), and the second outgoing line connecting section (2222) is connected to the XZX busbar group (6); The length H1 of the first incoming line connecting section (2112) is greater than the length H2 of the second outgoing line connecting section (2222), and the length L1 of the first incoming line horizontal section (2111) is greater than the length L2 of the second outgoing line horizontal section (2221).

8. The photovoltaic low-voltage combiner cabinet according to claim 6, characterized in that: The third outgoing line busbar (232) includes a third leading-out section (2321), a third inclined section (2322), and a third connecting section (2323). The third leading-out section (2321) is vertically connected to the lower end of the third inclined section (2322), and the third connecting section (2323) is horizontally connected to the upper end of the third inclined section (2322). The third inclined section (2322) is inclined backward relative to the side molded case circuit breaker (230). The third leading-out section (2321) is connected to the output end of the side molded case circuit breaker (230), and the third connecting section (2323) is connected to the XYY busbar group (5).

9. The photovoltaic low-voltage combiner cabinet according to claim 1, characterized in that: There are two frame circuit breakers (3), two XYX busbar groups (4), two XYY busbar groups (5), at least two XZX busbar groups (6), two first connecting member groups (7), and two second connecting member groups (8); The two frame circuit breakers (3), the two XYX busbar groups (4), the two XYY busbar groups (5), the two XZX busbar groups (6), the two first connector groups (7) and the two second connector groups (8) are respectively and bilaterally symmetrically arranged inside the frame cabinet (1); The two XYY busbar groups (5) are respectively located on the left and right sides of the frame cabinet (1).

10. The photovoltaic low-voltage combiner cabinet according to claim 9, characterized in that: A voltage transformer and a surge protector are also provided inside the frame cabinet (1); The frame cabinet (1) comprises an openable and closable shell.

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