Photovoltaic low-voltage switch equipment, power distribution room and transformer substation

Abstract

The utility model discloses photovoltaic low-voltage switch equipment, a power distribution room and a transformer substation, and belongs to the technical field of low-voltage switch equipment structures. The photovoltaic low-voltage switch equipment comprises a cabinet body, and a circuit breaker chamber, a secondary control chamber and a transformer chamber which are arranged in the cabinet body and are separated by partition plates, a molded case circuit breaker and a molded case busbar are arranged in the circuit breaker chamber; the molded case circuit breaker is connected with an incoming cable through a molded case circuit breaker lower branch bar, the molded case circuit breaker is connected with a molded case busbar through a molded case circuit breaker upper branch bar, the molded case busbar is connected with a low-voltage mutual inductor, the low-voltage mutual inductor is connected with a lower opening of a frame circuit breaker, and an upper opening of the frame circuit breaker is connected with a side outgoing line bar; according to the utility model, the wire inlet plastic shell, the wire outlet frame, the auxiliary transformer, the mutual inductor, the surge protector, the insulating part, the conductive loop and various intelligent control components are combined and applied, and are organically combined into a whole.

Description

TECHNICAL FIELD

[0001] The utility model belongs to low voltage switchgear structure technical field, concretely relates to a photovoltaic low voltage switchgear, power distribution room and substation. BACKGROUND

[0002] At present, it is an inevitable trend to build a new power system mainly with new energy, and photovoltaic power generation is one of the important components, which is of great significance to optimize energy structure, promote energy saving and emission reduction and realize sustainable economic development. In recent years, photovoltaic power stations have rapidly emerged, and the related supporting industries have ushered in a peak development period. Photovoltaic power generation equipment products are frequently updated and rapidly developed, not only obtaining a leap in quantity, but also ushering in a qualitative improvement. Photovoltaic low voltage grid-connected cabinet is a very important part of photovoltaic power generation system, and its internal structure is complex, and multiple aspects such as photovoltaic modules, inverters, grid connection, protection and monitoring need to be considered. In the prior art, the grid-connected voltage level is generally selected according to the capacity of the photovoltaic module, and for centralized photovoltaic power generation systems of 10MW and above, a prefabricated substation is usually used to raise the low voltage output by the inverter to 35kV and then output to the grid. Low voltage switchgear is the first power receiving equipment of new energy photovoltaic power station.

[0003] The traditional photovoltaic low voltage switchgear generally adopts a 0.4kV system, and a low voltage side system is composed of two or more distribution cabinets to realize the convergence and transmission of photovoltaic power generation electric energy and the consumption of control equipment electric energy, as well as related monitoring and protection functions. However, the traditional photovoltaic low voltage switchgear has the disadvantages of low voltage level, large cable current carrying requirement from the inverter side to the low voltage cabinet side, and large use of non-ferrous metal copper, which increases the difficulty of construction, installation and maintenance. SUMMARY

[0004] The utility model discloses a photovoltaic low voltage switchgear, power distribution room and substation, which solves the technical problems of the traditional photovoltaic low voltage switchgear in the prior art, such as dispersed structure, large size of the low voltage cabinet system, cabinet-to-cabinet connection, poor cabinet protection level, and high difficulty of construction, installation and maintenance.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] In a first aspect, the utility model provides a photovoltaic low voltage switchgear, which comprises a cabinet body and a circuit breaker chamber, a secondary control chamber and a transformer chamber arranged in the cabinet body and separated by a partition plate.

[0007] The circuit breaker chamber is provided with a circuit breaker and a busbar; the circuit breaker is connected with an incoming cable through a circuit breaker lower branch, and is connected with the busbar through a circuit breaker upper branch; the busbar is connected with a low-voltage transformer; the low-voltage transformer is connected with a lower opening of a frame circuit breaker; and the upper opening of the frame circuit breaker is connected with a side outgoing line branch.

[0008] The transformer chamber is provided with a molded case circuit breaker adopting an AC phase modulation structure; the upper opening of the frame circuit breaker is connected with the upper opening of the molded case circuit breaker through a low-voltage cable; the lower opening of the molded case circuit breaker is connected with the upper opening of an auxiliary transformer; and the lower opening of the auxiliary transformer is connected with a distribution box.

[0009] The secondary control chamber is provided with a control device connected with the circuit breaker.

[0010] The circuit breaker comprises a lower circuit breaker and an upper circuit breaker; the busbar comprises a lower busbar and an upper busbar; the lower circuit breaker is connected with an incoming cable through a circuit breaker lower branch, and is connected with the lower busbar through a circuit breaker upper branch; the lower busbar is connected with the upper busbar; the upper busbar is connected with the upper circuit breaker; and the upper circuit breaker is connected with a low-voltage transformer through a bus of the upper busbar.

[0011] Further improvement of the utility model lies in that the voltage level is 0.8kV system; and the lower circuit breaker is further connected with a surge protector.

[0012] Further improvement of the utility model lies in that the circuit breaker adopts a fixed plate front wiring structure.

[0013] Further improvement of the utility model lies in that the busbar and the branch in the circuit breaker chamber, the secondary control chamber and the transformer chamber are provided with an insulating plate at the lap joint busbar.

[0014] Further improvement of the utility model lies in that the lower part of the cabinet is provided with an air inlet channel, the top of the cabinet is provided with a cooling fan; and the circuit breaker chamber, the secondary control chamber and the transformer chamber are all provided with air ducts.

[0015] Further improvement of the utility model lies in that the cabinet adopts a C-shaped material and a cold-rolled steel plate bending assembly structure, and the cabinet protection level meets IP4X; the protection level between the circuit breaker chamber, the secondary control chamber and the transformer chamber meets IP2X; and the control device comprises a box transformer measurement and control device.

[0016] Further improvement of the utility model lies in that the distribution box is provided with a miniature circuit breaker.

[0017] In the second aspect, the utility model further provides a power distribution room comprising the above-mentioned low-voltage switch device for photovoltaic.

[0018] In a third aspect, the utility model also provides a transformer substation, including above-mentioned photovoltaic low voltage switchgear.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model discloses a kind of photovoltaic low voltage switchgear, breaker room, secondary control room and transformer room in cabinet are separated by baffle, breaker and busbar are arranged in breaker room, low voltage transformer is connected with busbar, low voltage transformer is connected frame breaker, and frame breaker is connected with side outgoing line row;Plastic shell circuit breaker is arranged in transformer room, and plastic shell circuit breaker is connected with frame breaker;Secondary control room is provided with control equipment connected with breaker, each element in traditional low voltage switchgear is organically combined into a whole, a kind of compact structure distribution equipment is designed, element layout is reasonable, land area is small, avoid many deficiencies when original multiple cabinet and cabinet, production cost is greatly reduced and effectively improves production efficiency, and reliability is high.Frame breaker has instantaneous, short delay, long delay, inverse time limit, ground fault protection etc., can realize quick break, overcurrent, single-phase grounding etc.

[0021] Further, product voltage grade selects 0.8kV system, system capacity is large under same current, current is small under same capacity, cable usage is reduced, and user cost is saved.

[0022] Further, insulating plate is installed at the overlapping of busbar and branch row in breaker room, secondary control room and transformer room, which can prevent electric shock and increase air volume at busbar, improve convective cooling efficiency, and improve equipment safety and reliability.

[0023] Further, the cabinet is equipped with a box transformer measurement and control device, which can realize low-voltage side breaker on-off control, remote control function, temperature alarm, protection and the like. In addition, the intelligent environment management system is also provided, which can control the heater in the contactor cabinet through dew point control (the dew point temperature can be obtained according to the current temperature and humidity) to control the dehumidification and prevent the temperature from being too low, so as to meet the temperature and humidity requirements of equipment operation. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings described herein are only for the purpose of explanation, and are not intended to limit the scope of the present utility model disclosure in any way. In addition, the shape and scale of each component in the drawings are only illustrative, which are used to help understand the present utility model, and are not specific limitations on the shape and scale of each component of the present utility model.

[0025] Figure 1 A system diagram of a low-voltage switch device for photovoltaic in the present utility model;

[0026] Figure 2 A front view of a low-voltage switch device for photovoltaic in the present utility model;

[0027] Figure 3 A line inlet cabinet side view of a low-voltage switch device for photovoltaic in the present utility model;

[0028] Figure 4 An auxiliary cabinet side view of a low-voltage switch device for photovoltaic in the present utility model;

[0029] Figure 5 A temperature rise circuit side view of a low-voltage switch device for photovoltaic in the present utility model;

[0030] Figure 6 A bus structure front view of a low-voltage switch device for photovoltaic in the present utility model;

[0031] Figure 7 A bus structure side view of a low-voltage switch device for photovoltaic in the present utility model;

[0032] Figure 8 An enlarged view of a bus structure of a low-voltage switch device for photovoltaic in the present utility model.

[0033] Wherein: 1, lower circuit breaker; 2, surge protector; 3, lower busbar; 4, upper busbar; 5, low voltage transformer; 6, frame circuit breaker; 7, side outgoing line row; 8, auxiliary transformer; 9, molded case circuit breaker; 10, UPS battery pack; 11, UPS power supply; 12, distribution box; 13, insulation plate; 14, cooling fan; 15, upper circuit breaker; 16, air inlet channel; 17, frame lower outlet row A phase; 18, frame lower outlet row C phase; 19, molded case upper outlet row A phase; 20, molded case upper outlet row C phase; 21, frame lower outlet row; 22, molded case upper outlet row; 23, molded case upper outlet row AC phase reverse phase structure. DETAILED DESCRIPTION

[0034] To make the objects, technical solutions, and advantages of the embodiments of the present application clearer, the following will be a clear and complete description of the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0036] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is used, it is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0038] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0039] In the description of the embodiments of the utility model, still need explaining, unless another explicit provision and limitation, if appearing term " set up ", " install ", " link ", " connect " should do broad sense, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electric connection, can be direct connection, also can be indirectly connected through intermediate medium, can be the intercommunication of two elements. For ordinary skilled in the art, can understand the concrete meaning of the above-mentioned term in the utility model according to specific circumstances.

[0040] The utility model will be described further in detail below in conjunction with the drawings:

[0041] Referring to Figure 1 , it is a primary system diagram of low-voltage switchgear for photovoltaic in the utility model, it is the core scheme of the bus side, and it is an important environment of the entire photovoltaic power generation loop, the photovoltaic module generates electricity and is transmitted to the 16-way 250A 0.8kV lower circuit breaker 1 and upper circuit breaker 15 bus of the low-voltage switchgear through inversion, is transmitted to the transformer T1 through the frame circuit breaker 6 and is raised to 40.5kV and is connected to the high-voltage switch cabinet, and the electricity generated by photovoltaic is transmitted to the power grid through the high-voltage cable. 1-way 17QF (63A molded case circuit breaker) provides power supply for control loop, on-site lighting, heating, video monitoring, maintenance, etc. through auxiliary transformer T2, and when the photovoltaic system does not generate electricity, the commercial power can also be transmitted to the on-site power load. The transformer T1 is not shown in Figures 2 to 8 , and the auxiliary transformer T2 is the auxiliary transformer 8 in Figures 2 to 8 . The low-voltage transformer 5 provides measurement and metering data; the surge protector 2 can improve the reliability and stability of the system, reduce or eliminate the interference of surges on the system, protect electronic equipment from the influence of transient overvoltage generated by the power grid or other equipment, and also prevent lightning from causing direct or indirect damage to the equipment. The lower circuit breaker 1 and the upper circuit breaker 15 have four-section protection, which can realize the functions of quick breaking, overcurrent, and single-phase grounding protection. The entire system scheme is fully functional, compact in structure, novel in design, and meets the requirements of photovoltaic power generation grid-connected power transmission. Figure 1 The meanings of the symbols in

[0042] Table 1

[0043]

[0044] Referring to Figure 2 and Figure 3The utility model discloses a kind of low-voltage switchgears for photovoltaic, including cabinet and be set in cabinet and are separated by partition breaker room, secondary control room and transformer room;Voltage grade is 0.8kV system;Cabinet adopts C profile and cold-rolled steel plate bending assembly structure, cabinet protection level meets IP4X, the protection level between breaker room, secondary control room and transformer room meets IP2X, cabinet both sides have no bolt exposed, appearance is beautiful, it is convenient to install maintenance.Series standardization design, all select standard element, can be according to the different requirements of work and environment, design corresponding protection level cabinet, equipment operation continuity and reliability are high;Intelligent function can be realized;

[0045] The breaker room is provided with a breaker and a busbar; the breaker includes a lower breaker 1 and an upper breaker 15, and both the lower breaker 1 and the upper breaker 15 are No. 17 molded case breakers; the busbar includes a lower busbar 3 and an upper busbar 4; the lower breaker 1 is connected with an incoming line cable through a breaker lower branch, the lower breaker 1 is connected with the lower busbar 3 through a breaker upper branch, the lower busbar 3 is connected with the upper busbar 4, and the upper busbar 4 is connected with the upper breaker 15; the busbar is arranged at the rear part of the cabinet between the two layers of molded case breakers (the upper breaker 15 and the lower breaker 1), and the two layers of molded case breakers are installed staggeredly in front and back, so that the branch connection is facilitated, the cable hanging of the upper breaker 15 is not affected, the structure layout is more reasonable, according to the current characteristics, the lower busbar 3 is selected as a single row, and the upper busbar 4 is selected as a double row, so that the performance parameters are ensured, the cabinet space and the cabinet cost are saved.

[0046] The upper breaker 15 is connected with a low-voltage mutual inductor 5 through a busbar of the upper busbar 4, the low-voltage mutual inductor 5 is a low-voltage current mutual inductor, the lower breaker 1 is indirectly connected with a surge protector 2, when the system works, the frame breaker 6, the lower breaker 1 and the upper breaker 15 are all in a closed state, the whole loop is conducted, so that the lower breaker 1 and the surge protector 2 are in a connected state at this time. The breaker adopts a fixed plate front wiring structure, which is arranged in two layers in front and back, so that the incoming line cable installation is facilitated, the removal and maintenance are convenient, the electrical elements in the cabinet run stably and orderly, the short-circuit risk is greatly reduced, and the power distribution work efficiency is increased.

[0047] Referring to Figure 5 The cabinet heat dissipation adopts a double-function structure, a natural air cooling and a forced air cooling structure mode, i.e. a ventilation shutter and a fan mode, the compartments have respective air ducts, Figure 5The arrow in the figure indicates the wind direction. The lower part of the cabinet is provided with an air inlet channel 16, and the top of the cabinet is provided with a heat dissipation fan 14. The air inlet and outlet channels of the box transformer and the fan cooperate to efficiently exchange the heat generated in the low-voltage chamber to the outside of the box body. The bus bar support is made of high-quality stainless steel plate to reduce eddy current heating and vibration, effectively solving the problem of large current temperature rise of the product. The air inlet of the cable chamber is from the lower door louvre, and the whole air is driven upward by the starting fan. The bus bar overlap joint generates a large amount of heat, and the insulation plate 13 is installed to improve the air volume at the heating position and improve the convective cooling efficiency, while ensuring the safety of electricity use and the safety and reliability of the equipment. The top fan 14 brings the heat outwards. The air circulation in the cabinet is ensured by the air inlet structure, and the blowing structure cooperates with the air outlet structure to heat and dry the cabinet while dissipating heat, ensuring the dryness of the cabinet and effectively avoiding excessive moisture. At the same time, the air inlet filter plate can effectively ensure that the heat dissipation can also achieve dust removal treatment, and the top structure can further enhance the use effect of the power distribution cabinet. It is equipped with an environmental management system, an intelligent start-stop fan and a dehumidifying device, which combines with the fan equipment in the box transformer to meet the temperature and humidity requirements of equipment operation, and is stable and reliable in work and low in self-loss.

[0048] Referring to Figure 6 , Figure 7 and Figure 8 , the bus bar structure is compact and reasonable, safe and reliable, and saves the volume of the cabinet. The conventional arrangement of the upper plastic shell upper bus bar 22 of the upper layer 1#2# circuit breaker interferes with the lower frame bus bar 21 of the frame circuit breaker at the overlap joint of the bus bar. The conventional upper plastic shell upper bus bar A phase 19 and the upper plastic shell upper bus bar C phase 20 of the circuit breaker respectively overlap with the lower frame bus bar A phase 17 and the lower frame bus bar C phase 20 of the frame circuit breaker, as shown in Figure 6 . In this case, the circuit breaker needs to be arranged in a staggered manner by increasing the width of the cabinet. After the cabinet is widened, the size of the box transformer and the length of the bus bar in the cabinet need to be increased accordingly. The utility model fully utilizes the space and reasonably avoids the overlap interference of the branch and bus bars, reduces the size of the cabinet while ensuring the performance of the scheme, and improves the overall aesthetics and economy.

[0049] The transformer chamber is provided with a plastic shell circuit breaker 9. The upper opening of the frame circuit breaker 6 is connected with the upper opening of the plastic shell circuit breaker 9 through a low-voltage cable. The lower opening of the plastic shell circuit breaker 9 is connected with the upper opening of the auxiliary transformer 8. The lower opening of the auxiliary transformer 8 is connected with the power distribution box 12.

[0050] The secondary control chamber is provided with a control device connected with the circuit breaker. The control device includes a box transformer measurement and control device.

[0051] The utility model discloses a low voltage switchgear for photovoltaic, improves electric field distribution while guaranteeing cabinet body strength, realizes that the seamless joint of the fixed cabinet of lower incoming line and side outgoing line and auxiliary transformer 8, arranges outgoing line busbar at the rear portion of frame circuit breaker 6, reduces cabinet body height, saves the inner cabinet top space, increases heat dissipation efficiency, realizes current power receiving and power consumption, is convenient for field installation, and saves resources.

[0052] The low-voltage side bottom plate is provided with a grounding circuit, the PEN line is led to the main grounding of the box body through the grounding circuit, the outgoing line side is reliably connected with the low-voltage sleeve of the transformer T1 through a soft connection, and the sleeve is prevented from being cracked.

[0053] The cabinet body structure design considers the factors influencing temperature rise such as large current of the low-voltage side and compact structure, meanwhile, the air duct is reasonably and reliably arranged, the air inlet channel is arranged at the lower part of the cabinet body, and the heat dissipation fan is arranged at the top of the cabinet body, which, in cooperation with the air inlet and outlet channels and the fan of the box transformer, can efficiently exchange the heat generated in the low-voltage chamber to the outside of the box body, the busbar clamp support used in the cabinet body is made of high-quality stainless steel plate to reduce eddy current heating and vibration, and the problem of large current temperature rise of the product is effectively solved.

[0054] The equipment is compact in structure, is provided with an environmental management system, and is provided with an intelligent start-stop fan and dehumidification device, and meets the temperature and humidity requirements of equipment operation.

[0055] The utility model discloses an embodiment further provides a kind of distribution room, including above-mentioned low voltage switchgear for photovoltaic.

[0056] The utility model discloses an embodiment further provides a kind of substation, including above-mentioned low voltage switchgear for photovoltaic.

[0057] It needs to be explained that the substation provided by the embodiment can also include the distribution room described above.

[0058] The working principle of the utility model is as follows:

[0059] The photovoltaic inverter sends 16 AC low voltage to the lower port of the lower circuit breaker (QF250A) 1, and the knife fuse switch of the surge protector 2 provides power to the lower port from the incoming line side. The upper port of the lower circuit breaker (QF250A) 1 is connected to the A, B and C phase bus of the lower bus 3 and the upper bus 4. The lower branch of the upper circuit breaker (QF250A) 15 is connected to the lower port of the frame circuit breaker 6 through the low voltage transformer 5 and the upper bus 4. The upper port of the frame circuit breaker 6 is connected to the side outgoing line 7, and the main bus of the side outgoing line 7 is connected to the low voltage side of the auxiliary transformer 8 through the bushing. The upper port of the plastic case circuit breaker 9 is connected to the upper port of the frame circuit breaker 6 through the low voltage cable, and the lower port of the plastic case circuit breaker 9 is connected to the upper port of the auxiliary transformer 8. The lower port of the auxiliary transformer 8 is connected to the micro circuit breaker in the distribution box 12, which provides power to the entire box transformer. One of the micro circuit breakers is connected to the UPS power supply 11, and the UPS battery pack 10 provides uninterrupted power supply to the UPS power supply 11.

[0060] Many embodiments and many applications besides those provided in the foregoing description are within the scope of the present teachings. Accordingly, the scope of the present teachings should not be determined with reference to the above description, but instead should be determined with reference to the appended claims along with their full scope of equivalents. For purposes of conformity, all articles and references, including patents and publications, are hereby incorporated by reference in their entirety. The omission of any aspect of the subject matter disclosed herein from the foregoing description is not a disclaimer of such subject matter, nor should it be construed as a disavowal of such subject matter as part of the disclosed inventive subject matter.

[0061] The above is a further detailed description of the present application, and cannot be determined that the specific embodiments of the present application are limited to this. For ordinary skilled in the art to which the present application belongs, without departing from the concept of the present application, a number of simple deductions or substitutions can be made, which should be regarded as belonging to the present application. The scope of protection is determined by the claims submitted.

Claims

1. A low-voltage switchgear for photovoltaic applications, characterized in that, It includes the cabinet and the circuit breaker room, secondary control room and transformer room set in the cabinet and separated by partitions; The circuit breaker room is equipped with a circuit breaker and a busbar; the circuit breaker is connected to the incoming cable through the lower branch of the circuit breaker, the circuit breaker is connected to the busbar through the upper branch of the circuit breaker, the busbar is connected to a low-voltage transformer (5), the low-voltage transformer (5) is connected to the lower end of the frame circuit breaker (6), and the upper end of the frame circuit breaker (6) is connected to a side outlet busbar (7). The transformer room is equipped with a molded case circuit breaker (9), which adopts an AC phase-adjusting structure; the upper port of the frame circuit breaker (6) is connected to the upper port of the molded case circuit breaker (9) via a low-voltage cable, the lower port of the molded case circuit breaker (9) is connected to the upper port of the auxiliary transformer (8), and the lower port of the auxiliary transformer (8) is connected to the distribution box (12). The secondary control room is equipped with control devices connected to the circuit breaker. The circuit breaker includes a lower circuit breaker (1) and an upper circuit breaker (15); the busbar includes a lower busbar (3) and an upper busbar (4); the lower circuit breaker (1) is connected to the incoming cable through the lower branch of the circuit breaker, the lower circuit breaker (1) is connected to the lower busbar (3) through the upper branch of the circuit breaker, the lower busbar (3) is connected to the upper busbar (4), the upper busbar (4) is connected to the upper circuit breaker (15); the upper circuit breaker (15) is connected to a low-voltage transformer (5) through the busbar of the upper busbar (4).

2. The low-voltage switchgear for photovoltaic applications according to claim 1, characterized in that, The voltage level is 0.8kV system; the lower circuit breaker (1) is also connected to a surge protector (2).

3. A low-voltage switchgear for photovoltaic applications according to claim 1, characterized in that, The circuit breaker adopts a fixed front-panel wiring structure.

4. A low-voltage switchgear for photovoltaic applications according to claim 1, characterized in that, Insulating plates (13) are provided at the junctions of the busbars and branch lines in the circuit breaker compartment, secondary control compartment and transformer compartment.

5. A low-voltage switchgear for photovoltaic applications according to claim 1, characterized in that, The lower part of the cabinet is provided with an air inlet channel (16), and the top of the cabinet is provided with a cooling fan (14); the circuit breaker room, the secondary control room and the transformer room are all provided with air ducts.

6. A low-voltage switchgear for photovoltaic applications according to claim 1, characterized in that, The cabinet adopts a C-shaped profile and cold-rolled steel plate bending assembly structure, and the cabinet protection level meets IP4X; the protection level between the circuit breaker room, secondary control room and transformer room meets IP2X; the control equipment includes a transformer substation monitoring and control device.

7. A low-voltage switchgear for photovoltaic applications according to claim 1, characterized in that, The distribution box (12) is equipped with a miniature circuit breaker.

8. A power distribution room, characterized in that, The photovoltaic low-voltage switchgear includes any one of claims 1-7.

9. A substation, characterized in that, The photovoltaic low-voltage switchgear includes any one of claims 1-7.

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