CN223451409U - A photovoltaic low-voltage combiner cabinet - Google Patents

Abstract

The photovoltaic low-voltage bus cabinet comprises a frame cabinet body, wherein a first operation surface of the frame cabinet body is provided with at least two plastic shell circuit breaker modules in a Z-axis direction at intervals, a second operation surface of the frame cabinet body is provided with one plastic shell circuit breaker module, a frame circuit breaker is arranged above a plurality of plastic shell circuit breaker modules, an XYX bus copper bar group is arranged in the frame cabinet body in an extending mode along an X axis and is connected with the XYY bus copper bar group which is arranged in the extending mode along a Y axis, the XYX bus copper bar group is electrically connected with the XZX bus copper bar group through a first connecting piece group, the XYX bus copper bar group, the XYY bus copper bar group and the XZX bus copper bar group are respectively provided with a plastic shell circuit breaker module, and the XYX bus copper bar group is electrically connected with an input end of the frame circuit breaker through a second connecting piece group. Through dividing into different regions with the frame cabinet body on degree of depth and height, the plastic case circuit breaker module in different regions is connected in frame circuit breaker through copper bar group and connecting piece group collection flow, make full use of low pressure collection flow high space and degree of depth space of cabinet, has improved space utilization.

Description

Photovoltaic low-voltage conflux cabinet

Technical Field

The utility model relates to the technical field of power transformation equipment, in particular to a photovoltaic low-voltage bus-bar cabinet.

Background

The photovoltaic power generation transformer substation, also called a box-type transformer substation, usually realizes preassembled integration of devices such as a low-voltage cabinet, a transformer, a ring main unit and the like, namely devices such as a converging device, a boosting device, a ring main unit and the like through a container. With the continuous development of the photovoltaic industry, the capacity of the transformer substation is larger and larger, so that the required space utilization rate is higher and higher.

The low-voltage cabinet in the transformer substation mainly comprises a branch switch (molded case circuit breaker) and a frame circuit breaker, wherein the branch switch is connected with the alternating current output of the series-connected inverter and is connected with the frame circuit breaker, so that low-voltage alternating current confluence is realized. The number of branch switches in the low-voltage cabinet determines the capacity of the transformer substation. In order to meet the capacity of a transformer substation, more branch switches are directly additionally arranged in the prior art, so that the volume of the low-voltage cabinet is larger and larger, and the internal layout of the low-voltage cabinet is unreasonable.

Disclosure of utility model

Aiming at the problems of the background technology, the utility model aims to provide a photovoltaic low-voltage convergence cabinet, which solves the problem that the additional layout of an internal branch switch of the existing low-voltage cabinet is unreasonable.

In order to achieve the purpose, the utility model adopts the following technical scheme:

A photovoltaic low-voltage bus-bar cabinet comprises a frame cabinet body, a plurality of molded case circuit breaker modules, a frame circuit breaker, an XYX bus-bar copper bar group, an XYY bus-bar copper bar group, at least one XZX bus-bar copper bar group, a first connecting piece group and a second connecting piece group;

The first operation surface of the frame cabinet body is provided with at least two molded case circuit breaker modules at intervals along the Z-axis direction, the second operation surface of the frame cabinet body is provided with one molded case circuit breaker module, the second operation surface is mutually perpendicular to the first operation surface, and the frame circuit breaker is arranged above a plurality of molded case circuit breaker modules;

The XYX bus bar copper bar group is arranged close to the back surface of the inside of the frame cabinet body, the length direction of the XYX bus bar copper bar group extends along an X axis, one end of the XYX bus bar copper bar group is connected with the XYY bus bar copper bar group, the length direction of the XYY bus bar copper bar group extends along a Y axis, the XYX bus bar copper bar group is electrically connected with the XZX bus bar copper bar group through the first connecting piece group, and the XZX bus bar copper bar group is positioned right below an area between the XYX bus bar copper bar group and the first operation surface;

The XYX busbar copper bar group, the XYY busbar copper bar group and the XZX busbar copper bar group are respectively and correspondingly and independently installed with the molded case circuit breaker module, and the XYX busbar copper bar group is electrically connected with the input end of the frame circuit breaker through the second connecting piece group.

Preferably, the molded case circuit breaker module comprises a plurality of three-phase molded case circuit breakers;

The XYX busbar copper bar group comprises three XYX busbar copper bars, the plate surfaces of the XYX busbar copper bars are parallel to an XY plane, and the three XYX busbar copper bars are arranged at intervals along the Z-axis direction;

The XYY bus copper bar group comprises three XYY bus copper bars, the plate surfaces of the XYY bus copper bars are parallel to an XY plane, and the three XYY bus copper bars are arranged at intervals along the Z-axis direction;

The XZX busbar copper bar group comprises three XZX busbar copper bars, the plate surface of each XZX busbar copper bar is parallel to the XZ plane, the length direction of each XZX busbar copper bar extends along the X axis direction, and the three XZX busbar copper bars are arranged at intervals along the Y direction.

Preferably, the first connector group comprises three first connectors, and the three first connectors are arranged at intervals along the Y-axis direction;

The first connecting piece comprises a vertical connecting section and a 匚 -type connecting section, the vertical connecting section extends along the Z-axis direction, the top end of the vertical connecting section is connected with the bottom end of the 匚 -type connecting section, the bottom of the vertical connecting section is connected with the XZX busbar copper, the top of the 匚 -type connecting section is connected with the XYX busbar copper, and the opening of the 匚 -type connecting section faces the first operation surface.

Preferably, the 匚 -type connecting section comprises an upper horizontal section, a vertical section and a lower horizontal section, wherein the upper horizontal section and the lower horizontal section are respectively arranged at the upper end and the lower end of the vertical section;

The three lower horizontal sections are all located below the XYX busbar group, the three upper horizontal sections are respectively connected with the three XYX busbar groups, the length equivalent of the three vertical sections is increased, and the length increase value is the interval distance between two adjacent XYX busbar groups.

Preferably, the second connector group comprises three L-shaped second connectors, and the three second connectors are arranged at intervals along the X-axis direction;

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 copper bar, and the vertical connecting section is connected with the input end.

Preferably, the 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, a first incoming line copper bar is arranged at the bottom of the upper-layer molded case circuit breakers, a first outgoing line copper bar is arranged at the top of the upper-layer molded case circuit breakers, the first incoming line copper bar is used for being connected with an external inverter, and the first outgoing line copper bar is connected with the XYX busbar group;

The three-phase plastic shell circuit breakers connected with the XZX busbar group are lower-layer plastic shell circuit breakers, the lower-layer plastic shell circuit breakers are arranged at intervals along the X-axis direction, second incoming copper bars are arranged at the bottom of the lower-layer plastic shell circuit breakers, second outgoing copper bars are arranged at the top of the lower-layer plastic shell circuit breakers and are used for being connected with an external inverter, and the second outgoing copper bars are connected with the XZX busbar group;

The three-phase plastic shell circuit breakers are connected with the XYY busbar groups, the three-phase plastic shell circuit breakers are side plastic shell circuit breakers, the side plastic shell circuit breakers are arranged at intervals along the Y-axis direction, third incoming wire copper bars are arranged at the bottoms of the side plastic shell circuit breakers, third outgoing wire copper bars are arranged at the tops of the side plastic shell circuit breakers and are used for being connected with an external inverter, and the third outgoing wire copper bars are connected with the XYY busbar groups.

Preferably, the first incoming line copper bar is in a zigzag shape, the first incoming line copper bar comprises a first incoming line section, a first incoming line horizontal section and a first incoming line connecting section, the first incoming line section and the first incoming line connecting section are respectively and vertically arranged at two ends of the first incoming line horizontal section, the first incoming line section is connected with the input end of the upper layer molded case circuit breaker, and the first incoming line connecting section is connected with the inverter;

The second outgoing line copper bar is in a figure 匚, the second outgoing line copper bar comprises a second leading-out section, a second outgoing line horizontal section and a second outgoing line connecting section, the second leading-out section and the second outgoing line connecting section are respectively and vertically arranged at two ends of the second outgoing line 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 line connecting section is connected with the XZX busbar copper group;

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

Preferably, the third outgoing copper bar comprises a third outgoing section, a third inclined section and a third connecting section, wherein the third outgoing section is vertically connected with the lower end of the third inclined section, the third connecting section is horizontally connected with the upper end of the third inclined section, the third inclined section is inclined backwards 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 busbar copper bar group.

Preferably, the frame circuit breaker is provided with two, the XYX bus copper bar sets are provided with two, the XYY bus copper bar sets are provided with at least two, the first connecting piece set is provided with two, and the second connecting piece set is provided with two;

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 respectively and bilaterally symmetrically arranged in the frame cabinet body;

The two XYY busbar copper bars are respectively positioned at the left side and the right side of the frame cabinet body.

Preferably, a voltage transformer and a surge protector are further arranged in the frame cabinet body;

the frame cabinet body comprises a shell which can be opened and closed.

Compared with the prior art, one of the technical schemes has the following beneficial effects:

1. through dividing into different regions with the frame cabinet body on degree of depth and height, the plastic case circuit breaker module in different regions is connected in the frame circuit breaker through copper bar group (XYX busbar copper bar group, XYY busbar copper bar group and XZX busbar copper bar group) and connecting piece group (first connecting piece group and second connecting piece group) converging, make full use of low-voltage bus cabinet's altitude space and degree of depth space, has improved space utilization. Meanwhile, the molded case circuit breaker module can be flexibly configured according to actual needs, so that the flexibility of the system is improved;

2. Compared with other low-voltage conflux cabinets, the heat-dissipating capacity of the conflux cabinet is greatly improved and the performance of the box transformer is improved by arranging two heat exchangers on the shell.

Drawings

FIG. 1 is a schematic diagram of the structure of one embodiment of the present utility model;

FIG. 2 is a front view of one embodiment of the utility model (not including a frame cabinet);

FIG. 3 is a schematic diagram of the frame circuit breaker, molded case circuit breaker module, XYX buss bar and XYY buss bar set of the present utility model;

FIG. 4 is a schematic view of another angle of FIG. 3;

FIG. 5 is a schematic diagram of the structure of a frame circuit breaker, molded case circuit breaker module, XYX busbar copper set, XYY busbar copper set and XZX busbar copper set of the present utility model;

fig. 6 is a schematic view of another angle of fig. 5.

The three-phase plastic-shell circuit breaker comprises a frame cabinet body 1, a first operation surface 11, a second operation surface 12, a plastic-shell circuit breaker module 2, a three-phase plastic-shell circuit breaker 200, an upper-layer plastic-shell circuit breaker 210, a first inlet copper bar 211, a first inlet horizontal section 2111, a first inlet connection section 2112, a first outlet copper bar 212, a lower-layer plastic-shell circuit breaker 220, a second inlet copper bar 221, a second outlet copper bar 222, a second outlet horizontal section 2221, a second outlet connection section 2222, a side plastic-shell circuit breaker 230, a third inlet copper bar 231, a third outlet copper bar 232, a third outlet section 2321, a third inclined section 2322, a third connection section 2323, a frame circuit breaker 3, an input end 31, an XYX bus copper bar group 4, an XYX bus copper bar 41, an XYY bus copper bar group 5, an XYY copper bar 51, an XZX bus copper bar group 6, an XZX bus copper bar 61, a first connection member group 7, a vertical connection section 71, a vertical connection section 匚, a horizontal connection section 723, a horizontal connection section 82, and a vertical connection section 723.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", and "a third" may explicitly or implicitly include one or more such feature.

It should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, or indirectly connected via an intermediate medium, or may be a communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The following describes the technical scheme of the present utility model further by means of specific embodiments with reference to fig. 1 to 6.

In photovoltaic power plants, low-voltage cabinets are installed in substations as key equipment for the collection, distribution and protection of electrical energy. Specifically, the direct current generated by each photovoltaic module is firstly converted into alternating current through an inverter, the alternating current is connected with an incoming wire copper bar of a molded case circuit breaker in a low-voltage cabinet through a specific cable or a wiring terminal, the molded case circuit breaker is used as a protection element of a circuit, the incoming wire current can be monitored and controlled, the circuit can be ensured to rapidly cut off a power supply when in overload, short circuit or ground fault, and the safety of the circuit and equipment is protected. The outgoing copper bar of the plastic shell circuit breaker gathers electric energy to the frame circuit breaker, the frame circuit breaker is used as a main switch and is responsible for controlling the on-off of the whole circuit, and the plastic shell circuit breaker has higher breaking capacity and short-circuit protection capacity. The electrical energy that is converged to the frame circuit breaker is delivered to the low voltage side of the transformer, which steps up the voltage to a level suitable for grid transmission, and then into the grid via the high voltage line.

The utility model provides a photovoltaic low-voltage bus-bar cabinet which comprises a frame cabinet body 1, a plurality of molded case circuit breaker modules 2, a frame circuit breaker 3, an XYX bus-bar copper bar group 4, an XYY bus-bar copper bar group 5, at least one XZX bus-bar copper bar group 6, a first connecting piece group 7 and a second connecting piece group 8;

The first operation surface 11 of the frame cabinet body 1 is provided with at least two molded case circuit breaker modules 2 at intervals along the Z-axis direction, the second operation surface 12 of the frame cabinet body 1 is provided with one molded case circuit breaker module 2, the second operation surface 12 is mutually perpendicular to the first operation surface 11, and the frame circuit breaker 3 is arranged above a plurality of molded case circuit breaker modules 2;

The XYX bus bar copper bar group 4 is arranged close to the back surface of the interior of the frame cabinet body 1, the length direction of the XYX bus bar copper bar group 4 extends along an X axis, one end of the XYX bus bar copper bar group 4 is connected with the XYY bus bar copper bar group 5, the length direction of the XYY bus bar copper bar group 5 extends along a Y axis, the XYX bus bar copper bar group 4 is electrically connected with the XZX bus bar copper bar group 6 through the first connecting piece group 7, and the XZX bus bar copper bar group 6 is positioned right below an area between the XYX bus bar copper bar group 4 and the first operation surface 11;

The XYX busbar copper bar group 4, the XYY busbar copper bar group 5 and the XZX busbar copper bar group 6 are respectively and correspondingly and independently installed with the molded case circuit breaker module 2, and the XYX busbar 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.

Preferably, the XYY busbar group 5 is vertically connected to the XYX busbar group 4. According to the utility model, the plurality of molded case circuit breaker modules 2 are respectively arranged on the two vertical operation surfaces (namely the first operation surface 11 and the second operation surface 12) of the frame cabinet body 1, so that the depth space (Y-axis direction) of the frame cabinet body 1 is effectively utilized. In addition, at least two plastic-case breaker modules 2 are arranged on the first operation surface 11 at intervals along the vertical direction, so that the height space (Z-axis direction) of the frame cabinet body 1 is effectively utilized, and the three-dimensional space inside the frame cabinet body 1 is fully utilized. The plastic shell circuit breaker module 2 that is located the below is through first connecting piece group 7 and the plastic shell circuit breaker module 2 sharing XYX copper bar group 4 that is located the top, and a plurality of plastic shell circuit breaker modules 2 pass through XYX copper bar group 4 with the input 31 electricity of frame circuit breaker 3 is connected, has saved the independent connection between a plurality of plastic shell circuit breaker modules 2 and the frame circuit breaker 3, avoids the internal connection complicacy, and this kind of overall arrangement has reduced the volume expansion problem that traditional low-voltage cabinet brought because of simply addding the plastic shell circuit breaker to this realizes the simplification installation of a plurality of plastic shell circuit breaker modules 2 on the vertical height, thereby improves the utilization ratio of low-voltage cabinet inner space.

Further, the molded case circuit breaker module 2 includes a plurality of three-phase molded case circuit breakers 200;

the XYX busbar copper bar group 4 comprises three XYX busbar copper bars 41, the plate surfaces of the XYX busbar copper bars 41 are parallel to an XY plane, and the three XYX busbar copper bars 41 are arranged at intervals along the Z-axis direction;

The XYY bus copper bar group 5 comprises three XYY bus copper bars 51, the plate surfaces of the XYY bus copper bars 51 are parallel to an XY plane, and the three XYY bus copper bars 51 are arranged at intervals along the Z-axis direction;

The XZX busbar copper bar group 6 comprises three XZX busbar copper bars 61, the plate surfaces of the XZX busbar copper bars 61 are parallel to the XZ plane, the length direction of the XZX busbar copper bars 61 extends along the X axis direction, and the three XZX busbar copper bars 61 are arranged at intervals along the Y direction.

By refining the molded case circuit breaker module 2 into a plurality of three-phase molded case circuit breakers 200, the current of each loop can be controlled more precisely, and the accuracy and reliability of the current processing can be improved. Meanwhile, the parallel connection of the plurality of three-phase plastic case breakers 200 can also improve the current carrying capacity of the whole bus cabinet.

The XYX busbar copper set 4, the XYY busbar copper set 5 and the XZX busbar copper set 6 respectively comprise three copper bars, and the three copper bars of each copper bar set respectively correspond to three-phase circuit connection of the three-phase molded case circuit breaker 200.

Further, the XZX busbar group 6 is located directly below the region between the XYX busbar group 4 and the first operation face 11. Specifically, although the XZX bus bar copper bar group 6 and the XYX bus bar copper bar group 4 are both used for connection with the two molded case circuit breaker modules 2 provided on the first operation face 11, the three XZX bus bar copper bars 61 are arranged at intervals in the Y axis direction in particular, instead of being arranged at intervals in the Z axis direction like the three XYX bus bar copper bars 41, which makes full use of the depth (Y axis direction) of the frame cabinet 1 while avoiding an increase in the vertical height of the cabinet.

In addition, three XZX bus copper bars 61 are arranged at intervals along the Y-axis direction, so that an interval space penetrating along the Z-axis direction is arranged between adjacent XZX bus copper bars 61, and internal heat dissipation is facilitated.

Further, the first connector group 7 includes three first connectors, and the three first connectors are arranged at intervals along the Y-axis direction;

The first connecting piece comprises a vertical connecting section 71 and a 匚 -type 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 匚 -type connecting section 72, the bottom of the vertical connecting section 71 is connected with the XZX busbar 61, the top of the 匚 -type connecting section 72 is connected with the XYX busbar 41, and the opening of the 匚 -type connecting section 72 faces the first operation surface 11.

The vertical connection section 71 is provided extending in the Z-axis direction (vertical direction), the bottom thereof is connected with the XZX bus bar 61, and the top thereof is connected with the 匚 -type connection section 72, and is wound around to be connected with the XYX bus bar 41 located thereabove by the structure of the 匚 -type connection section 72. Wherein, the opening of 匚 type linkage segment 72 is towards first operation face 11, then wind to be connected with each piece XYX copper bar 41 from the rear side of XYX copper bar group 4 through three-section bending to through keeping somewhere the anterior opening, with this dodges the three-phase molded case circuit breaker 200 of locating first operation face 11 and being connected with XYX copper bar 4, avoid electric wire's crossing.

Still further, the 匚 -type connecting section 72 includes an upper horizontal section 721, a vertical section 722, and a lower horizontal section 723, wherein the upper horizontal section 721 and the lower horizontal section 723 are respectively disposed at upper and lower ends of the vertical section 722;

The three lower horizontal sections 723 are all located below the XYX bus bar copper bar group 4, the three upper horizontal sections 721 are respectively connected with the three XYX bus bar copper bars 41, the length values of the three vertical sections 722 are increased, and the length increase value is the interval distance between two adjacent XYX bus bar copper bars 41.

This design achieves an exact match between the 匚 -type connection sections 72 of the three first connectors and the XYX buss copper bars 41 by ensuring that the length of the three vertical sections 722 increases equally and by an increase exactly equal to the separation distance between two adjacent XYX buss copper bars 41. This not only improves the stability and reliability of the connection, but also reduces the current transmission loss due to gap mismatch.

Further, the second connector set 8 includes three L-shaped second connectors, and the three second connectors are arranged at intervals along the X-axis direction;

The second connecting piece comprises a horizontal connecting section 81 and a vertical connecting section 82, wherein 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 busbar 41, and the vertical connecting section 82 is connected with the input end 31.

The L-shaped second connection element realizes a stable connection between the XYX busbar 41 and the input 31 of the frame circuit breaker 3 by means of the combination of the horizontal connection section 81 and the vertical connection section 82. The 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 second connecting piece of L type designs compactly, and occupation space is little for whole conflux cabinet's internal layout is more reasonable and high-efficient. The design not only improves the space utilization rate, but also provides more convenience for subsequent maintenance and upgrading.

The L-shaped second connector forms a certain heat dissipation channel through the arrangement of the interval while connecting the XYX bus bar 41 and the input end 31 of the frame breaker 3. Under high current load, these heat dissipation channels can accelerate the dissipation of heat, reduce equipment temperature, improve equipment's stability and life-span.

Further, the three-phase molded case circuit breakers 200 connected with the XYX busbar group 4 are upper molded case circuit breakers 210, the upper molded case circuit breakers 210 are arranged at intervals along the X-axis direction, a first wire inlet copper bar 211 is arranged at the bottom of the upper molded case circuit breakers 210, a first wire outlet copper bar 212 is arranged at the top of the upper molded case circuit breakers 210, the first wire inlet copper bar 211 is used for being connected with an external inverter, and the first wire outlet copper bar 212 is connected with the XYX busbar group 4;

The three-phase molded case circuit breakers 200 connected with the XZX busbar group 6 are lower molded case circuit breakers 220, the lower molded case circuit breakers 220 are arranged at intervals along the X-axis direction, second incoming wire copper bars 221 are arranged at the bottoms of the lower molded case circuit breakers 220, second outgoing wire copper bars 222 are arranged at the tops of the lower molded case circuit breakers 220, the second incoming wire copper bars 221 are used for being connected with an external inverter, and the second outgoing wire copper bars 222 are connected with the XZX busbar group 6;

The three-phase molded case circuit breakers 200 connected with 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, third wire inlet copper bars 231 are arranged at the bottoms of the side molded case circuit breakers 230, third wire outlet copper bars 232 are arranged at the tops of the side molded case circuit breakers 230, the third wire inlet copper bars 231 are used for being connected with an external inverter, and the third wire outlet copper bars 232 are connected with the XYY busbar group 5.

The plastic shell circuit breaker is divided into an upper layer, a lower layer and lateral arrangement, so that independent power supply and control of different busbar copper sets are realized. The layering and lateral layout enables the molded case circuit breaker and the busbar copper set to be compactly arranged in the busbar cabinet, and space utilization is improved.

Each molded case circuit breaker is provided with independent incoming and outgoing copper bars, so that current can be stably and reliably transmitted to corresponding bus copper bar groups, and the current distribution capacity of the whole bus cabinet is improved. The capacity and the current distribution capacity of the bus-bar cabinet can be conveniently adjusted by increasing or reducing the number of the molded case circuit breakers so as to adapt to photovoltaic power generation systems with different scales and requirements.

It is worth to say that the molded case circuit breaker corresponds to a three-phase circuit, so that three copper bars for incoming line and three copper bars for outgoing line are correspondingly arranged. Specifically, the incoming copper bar of the a phase corresponds to the outgoing copper bar of the a phase, and the outgoing copper bar of the a phase corresponds to the busbar copper bar (XYX busbar copper bar 41, XYY busbar copper bar 51, and XZX busbar copper bar 61) connected to the a phase, which is not described in detail below.

Further, the first incoming copper bar 211 is in a zigzag shape, the first incoming copper bar 211 includes a first incoming section, a first incoming horizontal section 2111 and a first incoming connection section 2112, the first incoming section and the first incoming connection section 2112 are respectively and vertically disposed at two ends of the first incoming horizontal section 2111, the first incoming section is connected with an input end of the upper layer molded case circuit breaker 210, and the first incoming connection section 2112 is connected with the inverter;

the second outgoing copper bar 222 is in a shape of 匚, the second outgoing copper bar 222 includes a second outgoing section, a second outgoing horizontal section 2221 and a second outgoing connection section 2222, the second outgoing section and the second outgoing connection section 2222 are respectively and vertically arranged at two ends of the second outgoing horizontal section 2221, the second outgoing section is connected with an output end of the lower layer molded case circuit breaker 220, and the second outgoing connection section 2222 is connected with the XZX busbar copper bar group 6;

The length H1 of the first incoming line connection section 2112 is greater than the length H2 of the second outgoing line connection 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.

The first incoming copper bar 211 adopts a zigzag design, which makes the copper arrangement more compact and can effectively save space. At the same time, the "zig-zag" design also provides a better electrical connection path, helping to reduce losses during current transfer.

The second outgoing copper bar 222 adopts a '匚' shape design, and the structure can effectively enhance the mechanical strength and stability of the copper bar, so that the copper bar can be more firmly connected to related equipment, and connection looseness or faults caused by vibration or external force effect are reduced.

Further, by adjusting the sizes of the first incoming copper bar 211 and the second outgoing copper bar 222, compact and orderly connection between different plastic-case circuit breaker modules inside the cabinet is ensured. Specifically, since the lower molded case circuit breaker 220 is located below the upper molded case circuit breaker 210 and all the electric energy of the molded case circuit breaker is input from the wire-inlet copper bar at the bottom and output from the wire-outlet copper bar at the top, the connection position of the lower molded case circuit breaker 220 and the external device (inverter) can be directly disposed directly below the lower molded case circuit breaker, and accordingly, the connection position of the upper molded case circuit breaker 210 located above the lower molded case circuit breaker and the external device needs to be adjusted and "migrated" to the rear of the connection position of the lower molded case circuit breaker 220 and the external device through the first wire-inlet copper bar 211 in the shape of a "Z". Meanwhile, in order to ensure the arrangement of the outgoing copper bars of the lower molded case circuit breaker 220, the second outgoing copper bar 222 is arranged in a shape of "匚", and the length H1 (corresponding to the extension height in the Z-axis direction) of the first incoming connection section 2112 is greater than the length H2 (corresponding to the extension height in the Z-axis direction) of the second outgoing connection section 2222, and the length L1 (corresponding to the extension distance in the Y-axis direction) of the first incoming horizontal section 2111 is greater than the length L2 (corresponding to the extension distance in the Y-axis direction) of the second outgoing copper bar 2221, so that the first incoming copper bar 211 "wraps" the second outgoing copper bar 222.

Further, the third outgoing copper bar 232 includes a third outgoing section 2321, a third oblique section 2322 and a third connection section 2323, the third outgoing section 2321 is vertically connected with the lower end of the third oblique section 2322, the third connection section 2323 is horizontally connected with the upper end of the third oblique section 2322, the third oblique section 2322 is inclined backwards relative to the side molded case circuit breaker 230, the third outgoing section 2321 is connected with the output end of the side molded case circuit breaker 230, and the third connection section 2323 is connected with the XYY busbar group 5.

The special design of the third wire copper bar 232 makes the installation process simpler and faster. The inclined third inclined segment 2322 and the horizontal third connecting segment 2323 provide more operating space for the installer, reducing the installation difficulty. Meanwhile, the design is convenient for subsequent maintenance and overhaul work, and the maintenance cost and time are reduced.

Further, two frame breakers 3 are provided, two XYX busbar copper sets 4 are provided, two XYY busbar copper sets 5 are provided, at least two XZX busbar copper sets 6 are provided, two first connector sets 7 are provided, and two second connector sets 8 are provided;

The two frame circuit breakers 3, the two XYX bus copper bar groups 4, the two XYY bus copper bar groups 5, the two XZX bus copper bar groups 6, the two first connecting piece groups 7 and the two second connecting piece groups 8 are respectively and symmetrically arranged in the frame cabinet body 1;

the two XYY busbar copper sets 5 are respectively positioned at the left side and the right side of the frame cabinet body 1.

By increasing the number of the frame circuit breakers 3, the current carrying capacity and the short-circuit protection capacity of the photovoltaic low-voltage junction box can be remarkably improved, so that the photovoltaic low-voltage junction box is suitable for a larger-scale photovoltaic power generation system. Accordingly, each frame circuit breaker 3 is configured with the corresponding XYX busbar copper set 4, XYY busbar copper set 5, and XZX busbar copper set 6 for mounting the three-phase molded case circuit breaker 200, which not only increases flexibility of current distribution, but also improves redundancy and reliability of the system. The two sets of low-pressure systems can operate simultaneously or respectively, so that the stable operation of the systems is ensured.

The components are symmetrically arranged left and right, so that the layout of the whole bus cabinet is more balanced and attractive, the utilization rate of the internal space can be improved, unnecessary space waste can be reduced, and the bus cabinet is more compact and efficient. The XYY bus bar groups 5 (side molded case circuit breakers 230) are respectively arranged on the left and right sides of the frame cabinet 1, which contributes to improvement of maintenance efficiency.

Furthermore, a voltage transformer and a surge protector are also arranged in the frame cabinet body 1;

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

In the photovoltaic low-voltage bus-bar cabinet, electrical elements such as a voltage transformer, a current transformer and a surge protector can be flexibly added. The addition of the voltage transformer (PT) enables the photovoltaic low-voltage bus-bar cabinet to accurately measure and monitor the voltage conditions in the circuit. Through voltage transformer (PT), operation and maintenance personnel can know the fluctuation condition of electric wire netting voltage in real time, in time discovers voltage abnormality to take corresponding safeguard measure, ensure photovoltaic power plant's safe operation. Furthermore, the external data acquisition device and the surge protector can be respectively connected with the molded case circuit breakers in the molded case circuit breaker module (the connected molded case circuit breakers are not connected with the bus copper bars), the data acquisition device can acquire and record various data in the circuit, such as voltage, current, power and the like, and the surge protector can provide effective lightning protection and overvoltage protection for the whole electrical system, and through mutual cooperation, the accuracy and the integrity of the data are ensured, and the safety and the reliability of the electrical system are improved.

In addition, the frame cabinet body 1 is also provided with a shell which can open and close the frame cabinet body 1, the shell provides effective protection for the electric elements in the cabinet body, and plays a role in preventing dust, moisture and other pollutants from entering the cabinet body and avoiding damage to the electric elements. Meanwhile, the shell also has certain shock resistance and shock resistance, and can protect the inside electric elements from normal operation in severe environments.

Preferably, a heat exchanger may be further provided outside the housing for heat exchange inside the frame cabinet 1.

Preferably, the photovoltaic low-voltage junction cabinet of the utility model is an outdoor cabinet, waterproof grade IP54, and anti-corrosion grade C4-H.

The low-voltage convergence cabinet is more compact and stable in structure through reasonable layout and design. The compact structure not only saves space and improves the integration level and efficiency of the electrical system, but also is convenient for daily maintenance and expansion and upgrading. The method is helpful for promoting the development of the photovoltaic industry and the modern construction of the photovoltaic power station, and improving the overall performance and energy efficiency level of the photovoltaic power station.

The technical principle of the present utility model is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the utility model and should not be taken in any way as limiting the scope of the utility model. Other embodiments of the utility model will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein, without departing from the spirit and scope of the utility model as defined by the claims.

Claims (10)

1. The photovoltaic low-voltage bus-bar cabinet is characterized by comprising a frame cabinet body (1), a plurality of plastic shell circuit breaker modules (2), a frame circuit breaker (3), an XYX bus-bar copper bar group (4), an XYY bus-bar copper bar group (5), at least one XZX bus-bar copper bar group (6), a first connecting piece group (7) and a second connecting piece group (8);

The frame cabinet comprises a frame cabinet body (1), at least two molded case circuit breaker modules (2) are arranged on a first operation surface (11) of the frame cabinet body (1) at intervals along the Z-axis direction, one molded case circuit breaker module (2) is arranged on a second operation surface (12) of the frame cabinet body (1), the second operation surface (12) is perpendicular to the first operation surface (11), and the frame circuit breaker (3) is arranged above a plurality of molded case circuit breaker modules (2);

The XYX bus bar copper bar group (4) is arranged close to the back surface of the inside of the frame cabinet body (1), the length direction of the XYX bus bar copper bar group (4) extends along an X axis, one end of the XYX bus bar copper bar group (4) is connected with the XYY bus bar copper bar group (5), the length direction of the XYY bus bar copper bar group (5) extends along a Y axis, the XYX bus bar copper bar group (4) is electrically connected with the XZX bus bar copper bar group (6) through the first connecting piece group (7), and the XZX bus bar copper bar group (6) is positioned under the area between the XYX bus bar copper bar group (4) and the first operation surface (11);

the XYX busbar copper bar group (4), the XYY busbar copper bar group (5) and the XZX busbar copper bar group (6) are respectively and correspondingly and independently installed with the molded case circuit breaker module (2), and the XYX busbar copper bar group (4) is electrically connected with an input end (31) of the frame circuit breaker (3) through the second connecting piece group (8).

2. The photovoltaic low-voltage junction box 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 bus copper bar group (4) comprises three XYX bus copper bars (41), the plate surfaces of the XYX bus copper bars (41) are parallel to an XY plane, and the three XYX bus copper bars (41) are arranged at intervals along the Z-axis direction;

the XYY bus copper bar group (5) comprises three XYY bus copper bars (51), the plate surfaces of the XYY bus copper bars (51) are parallel to an XY plane, and the three XYY bus copper bars (51) are arranged at intervals along the Z-axis direction;

The XZX busbar copper bar group (6) comprises three XZX busbar copper bars (61), the plate surface of each XZX busbar copper bar (61) is parallel to the XZ plane, the length direction of each XZX busbar copper bar (61) extends along the X axis direction, and the three XZX busbar copper bars (61) are arranged at intervals along the Y direction.

3. The photovoltaic low-voltage junction box according to claim 2, wherein the first connecting piece group (7) comprises three first connecting pieces, and the three first connecting pieces are arranged at intervals along the Y-axis direction;

The first connecting piece comprises a vertical connecting section (71) and a 匚 -type 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 匚 -type connecting section (72), the bottom of the vertical connecting section (71) is connected with the XZX busbar copper (61), the top of the 匚 -type connecting section (72) is connected with the XYX busbar copper (41), and the opening of the 匚 -type connecting section (72) faces the first operation surface (11).

4. The photovoltaic low-voltage junction box according to claim 3, wherein the 匚 -type connecting section (72) comprises an upper horizontal section (721), a vertical section (722) and a lower horizontal section (723), and the upper horizontal section (721) and the lower horizontal section (723) are respectively arranged at the upper end and the lower end of the vertical section (722);

The three lower horizontal sections (723) are all located 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 length equivalent of the three vertical sections (722) is increased, and the increased value of the length is the interval distance between two adjacent XYX bus copper bars (41).

5. The photovoltaic low-voltage junction box according to claim 2, wherein the second connecting piece group (8) comprises three L-shaped second connecting pieces, and the three second connecting pieces are arranged at intervals along the X-axis direction;

The second connecting piece comprises a horizontal connecting section (81) and a vertical connecting section (82), wherein 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 busbar copper (41), and the vertical connecting section (82) is connected with the input end (31).

6. The photovoltaic low-voltage junction box according to any one of claims 3 or 5, wherein the three-phase plastic case breakers (200) connected with the XYX busbar copper set (4) are upper-layer plastic case breakers (210), the upper-layer plastic case breakers (210) are arranged at intervals along the X-axis direction, a first incoming copper bar (211) is arranged at the bottom of the upper-layer plastic case breakers (210), a first outgoing copper bar (212) is arranged at the top of the upper-layer plastic case breakers (210), the first incoming copper bar (211) is used for being connected with an external inverter, and the first outgoing copper bar (212) is connected with the XYX busbar copper set (4);

The three-phase plastic shell circuit breakers (200) connected with the XZX busbar group (6) are lower-layer plastic shell circuit breakers (220), the lower-layer plastic shell circuit breakers (220) are arranged at intervals along the X-axis direction, second incoming copper bars (221) are arranged at the bottom of the lower-layer plastic shell circuit breakers (220), second outgoing copper bars (222) are arranged at the top of the lower-layer plastic shell circuit breakers (220), the second incoming copper bars (221) are used for being connected with an external inverter, and the second outgoing copper bars (222) are connected with the XZX busbar group (6);

The three-phase plastic shell circuit breakers (200) connected with the XYY busbar group (5) are side plastic shell circuit breakers (230), the side plastic shell circuit breakers (230) are arranged at intervals along the Y-axis direction, third wire inlet copper bars (231) are arranged at the bottoms of the side plastic shell circuit breakers (230), third wire outlet copper bars (232) are arranged at the tops of the side plastic shell circuit breakers (230), the third wire inlet copper bars (231) are used for being connected with an external inverter, and the third wire outlet copper bars (232) are connected with the XYY busbar group (5).

7. The photovoltaic low-voltage junction box according to claim 6, wherein the first incoming copper bar (211) is Z-shaped, the first incoming copper bar (211) comprises a first incoming section, a first incoming horizontal section (2111) and a first incoming connecting section (2112), the first incoming section and the first incoming connecting section (2112) are respectively and vertically arranged at two ends of the first incoming horizontal section (2111), the first incoming section is connected with the input end of the upper plastic case breaker (210), and the first incoming connecting section (2112) is connected with the inverter;

The second outgoing line copper bar (222) is in a '匚' shape, the second outgoing line copper bar (222) comprises a second outgoing line section, a second outgoing line horizontal section (2221) and a second outgoing line connecting section (2222), the second outgoing line section and the second outgoing line connecting section (2222) are respectively and vertically arranged at two ends of the second outgoing line horizontal section (2221), the second outgoing line section is connected with the output end of the lower layer molded case circuit breaker (220), and the second outgoing line connecting section (2222) is connected with the XZX busbar copper 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 junction box according to claim 6, wherein the third outgoing copper bar (232) comprises a third outgoing section (2321), a third oblique section (2322) and a third connecting section (2323), the third outgoing section (2321) is vertically connected with the lower end of the third oblique section (2322), the third connecting section (2323) is horizontally connected with the upper end of the third oblique section (2322), the third oblique section (2322) is inclined backwards relative to the side molded case circuit breaker (230), the third outgoing section (2321) is connected with the output end of the side molded case circuit breaker (230), and the third connecting section (2323) is connected with the XYY junction copper bar group (5).

9. The photovoltaic low-voltage bus-bar cabinet according to claim 1, wherein two frame breakers (3) are arranged, two XYX bus-bar copper bar groups (4) are arranged, two XYY bus-bar copper bar groups (5) are arranged, at least two XZX bus-bar copper bar groups (6) are arranged, two first connecting piece groups (7) are arranged, and two second connecting piece groups (8) are arranged;

The two frame circuit breakers (3), the two XYX bus copper bar groups (4), the two XYY bus copper bar groups (5), the two XZX bus copper bar groups (6), the two first connecting piece groups (7) and the two second connecting piece groups (8) are respectively and symmetrically arranged in the frame cabinet body (1) in a left-right mode;

The two XYY busbar copper sets (5) are respectively positioned at the left side and the right side of the frame cabinet body (1).

10. The photovoltaic low-voltage junction box according to claim 9, wherein a voltage transformer and a surge protector are further arranged in the frame box body (1);

the frame cabinet body (1) comprises a shell which can be opened and closed.