A low-voltage switchgear and containerized substation

Abstract

This utility model relates to a low-voltage switchgear and a containerized substation. The low-voltage switchgear includes: an upper compartment containing multiple pre-installed circuit boards (PCS) arranged side-by-side, the PCS being connected to an energy storage battery; a lower compartment containing multiple control components, the control components being used to control the bidirectional charging and discharging between the energy storage battery and a transformer connected to the power grid; and a partition plate, which divides the low-voltage compartment into the upper and lower compartments. This utility model's low-voltage switchgear can be divided into upper and lower compartments, arranging multiple PCS in the upper compartment and control components in the lower compartment, effectively utilizing space and facilitating component maintenance.

Description

Technical Field

[0001] This utility model relates to the field of containerized substation technology, specifically to a low-voltage switchgear and a containerized substation. Background Technology

[0002] Under the major trend of energy transition, the energy storage system in the prefabricated substation adopts a multi-battery cluster architecture and is deeply coupled with the power grid. Therefore, multiple PCS are required. The existing product structure is mostly a single-layer PCS cabinet with the built-in PCS independently integrated. This means that when using multiple PCS, multiple PCS cabinets need to be arranged, resulting in large space occupation, low space utilization, and unfriendly to space-constrained sites. In addition, the components in the single-layer cabinet are dense, the wiring is complicated, the space for fault diagnosis and maintenance is small, the efficiency is low, and there are safety hazards. Utility Model Content

[0003] To solve the above-mentioned technical problems, one of the objectives of this utility model is to provide a low-voltage cabinet that is divided into upper and lower compartments, with multiple PCS arranged in the upper compartment and control components arranged in the lower compartment, which effectively utilizes space and facilitates component maintenance.

[0004] To solve the above-mentioned technical problems, the present invention proposes the following technical solution: This application relates to a low-voltage switchgear, which includes: The upper compartment contains multiple PCS arranged side by side, which are used to connect to the energy storage battery. The lower compartment contains multiple control components, which are used to control the bidirectional charging and discharging between the energy storage battery and the transformer connected to the power grid. A partition plate is used to divide the low-pressure compartment into the upper compartment and the lower compartment.

[0005] In some embodiments of this application, the plurality of control components include a first group of control components and a second group of control components arranged side by side; The lower compartment also includes a duct partition, a first cooling fan, and a second cooling fan. The duct partition is arranged longitudinally and is used to divide the lower compartment into a first space and a second space. The first set of control components is located in the first space on one side of the duct partition, and the second set of control components is located in the second space on the other side of the duct partition. The first space and the second space are respectively connected to the outside world, and the outside airflow driven by the first cooling fan flows through the first space in a direction consistent with the longitudinal extension direction of the air duct partition, and the outside airflow driven by the second cooling fan flows through the second space in a direction consistent with the longitudinal extension direction of the air duct partition.

[0006] In some embodiments of this application, the multiple control components include multiple DC switches, multiple AC fuses, a first frame circuit breaker, and a second frame circuit breaker. The number of multiple DC switches and multiple AC fuses are equal and are all equal to the total number of all PCS. A DC switch, a PCS, and an AC fuse for connecting an energy storage battery are connected in sequence to form a PCS branch; A portion of the PCS branch's parallel connection points are connected to the first frame circuit breaker, while another portion of the PCS branch's parallel connection points are connected to the second frame circuit breaker.

[0007] The first group of control components includes multiple DC switches and multiple AC fuses corresponding to one part of the PCS branch, as well as a first frame circuit breaker. The second group of control components includes multiple DC switches and multiple AC fuses corresponding to another part of the PCS branch, as well as a second frame circuit breaker.

[0008] In some embodiments of this application, an installation beam is also arranged in the lower compartment, the installation beam is perpendicularly connected to the air duct partition, and the plurality of DC switches are arranged in parallel on the installation beam; In the first group of control components, multiple AC fuses and a first frame circuit breaker are located on one side of the duct partition, while in the second group of control components, multiple AC fuses and a second frame circuit breaker are located on the other side of the duct partition.

[0009] In some embodiments of this application, the layer spacer has multiple cable passages for passing through cables that connect the corresponding control components to the PCS; The layer partition plate is provided with a wire sealing device corresponding to the wire passage, which is used to seal and isolate the upper compartment and the lower compartment at the corresponding wire passage.

[0010] In some embodiments of this application, a first busbar and a second busbar are also arranged in the lower compartment; The AC fuses corresponding to a portion of the PCS branches are arranged longitudinally side by side and each is connected to the first busbar via a cable; The AC fuses corresponding to the other part of the PCS branch are arranged longitudinally side by side and each is connected to the second busbar by a cable; The first frame circuit breaker is connected to the first busbar via a copper busbar, and the second frame circuit breaker is connected to the second busbar via a copper busbar.

[0011] In some embodiments of this application, a first ventilation grille and a second ventilation grille are installed on the lower compartment; The first ventilation grille corresponds to the first space, and external airflow is introduced into the first space through the first ventilation grille; The second ventilation grille corresponds to the second space, and external airflow is introduced into the second space through the second ventilation grille; The first cooling fan and the first ventilation grille are installed opposite each other on the lower compartment, and the first cooling fan draws the airflow in the first space out to the outside of the lower compartment; The second cooling fan is installed opposite to the second ventilation grille on the lower compartment, and the second cooling fan draws the airflow in the second space out to the outside of the lower compartment.

[0012] In some embodiments of this application, the upper compartment is provided with multiple PCS limiting units, with one PCS arranged within one PCS limiting unit; The plurality of PCS includes a first row of PCS and a second row of PCS arranged back to back, each row of PCS includes a plurality of PCS arranged longitudinally side by side, the first row of PCS is located above the first space, and the second row of PCS is located above the second space. Each PCS is also equipped with an air guide device, which is used to introduce external airflow to the corresponding PCS; All air guide devices of the first row of PCS and all air guide devices of the second row of PCS face away from each other and towards the outside of the upper compartment.

[0013] Compared with the prior art, the low-voltage switchgear embodiment proposed in this application has the following advantages and beneficial effects: (1) The low-voltage cabinet is divided into an upper compartment and a lower compartment with two layers. Multiple PCS are placed in the upper compartment and multiple control components are arranged in the lower compartment. This can meet the string assembly of multiple PCS in a limited space and improve the space utilization of the low-voltage cabinet. (2) Multiple control components are arranged in the lower compartment, which facilitates the maintenance of the components and makes it easier to connect the components, thereby reducing on-site operation and maintenance costs and improving maintenance efficiency.

[0014] This application also relates to a containerized substation, which includes: A shipping container, wherein the container is divided into low-pressure compartments; As described above, the low-pressure cabinet is divided into an upper compartment and a lower compartment, and the upper compartment is an open compartment.

[0015] In some embodiments of this application, the container further divides into a transformer compartment, which is arranged adjacent to the low-voltage compartment. The containerized substation also includes: A transformer, which is placed in the transformer compartment.

[0016] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments of this utility model or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of an embodiment of the containerized substation proposed in this utility model; Figure 2 This is a partial structural diagram of an embodiment of the containerized substation proposed in this utility model, in which multiple PCS are not assembled; Figure 3 This is a front view of an embodiment of the containerized substation proposed in this utility model; Figure 4 This is a partial cross-sectional view along the AA direction of an embodiment of the containerized substation proposed in this utility model. Figure label: 100. Containerized substation; 110. Container; 120. Low-voltage compartment; 130. Transformer compartment; 140. High-voltage compartment; 200. Upper compartment; 210. PCS limit unit; 220. PCS limit rail; 230. First row of PCS; 240. Second row of PCS; 250. PCS; 260. Air guide device; 270. Cabinet door; 280. Wiring sealing device; 300. Lower compartment; 310. First space; 3 20. Second space; 330. Air duct partition; 340. First set of control components; 341. DC switch; 342. AC fuse; 343. First frame circuit breaker; 344. First busbar; 350. Second set of control components; 351. Second frame circuit breaker; 361. First cooling fan; 362. Second cooling fan; 371. First ventilation grille; 372. Second ventilation grille; 380. Mounting beam; 390. Inspection door. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this utility model. In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0022] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0023] To achieve string energy storage, multiple PCS (Power Conversion Systems) are required. To avoid the large space occupied by multiple PCS, this application relates to a low-voltage switchgear, which divides the cabinet into an upper compartment 200 and a lower compartment 300 using a partition plate (not shown). Multiple PCS 250 are arranged side by side in the upper compartment 200, and multiple control components are arranged in the lower compartment 300. These control components are the components that need to control the bidirectional charging and discharging between the energy storage battery and the transformer.

[0024] It should be noted that the PCS is connected to the energy storage battery. When the energy storage battery is discharging, the current direction is from the energy storage battery, through the PCS, to the transformer. When charging the energy storage battery, the current direction is from the transformer, through the PCS, to the energy storage battery. Therefore, multiple control components include devices for controlling the charging and discharging process of the energy storage battery.

[0025] The partition plate can be made of galvanized steel sheet with a thickness of ≥2mm, which is used to maintain physical isolation between the upper compartment 200 and the lower compartment 300, and to achieve safe isolation between the PCS in the upper compartment 200 and the control components in the lower compartment 300.

[0026] With the development of prefabricated substations in China, many domestic manufacturers are exporting their products overseas via sea freight. This necessitates the use of standard containers for transporting these substations, thus placing higher space requirements on prefabricated substations with string energy storage systems. Therefore, see [link to relevant documentation]. Figure 1 Some embodiments of this application also relate to a containerized substation for outdoor use and comprising a container 110, the container 110 being of standard container size, and the container 110 including a low-pressure compartment 120.

[0027] The low-voltage cabinet described above can be an independent cabinet and can be arranged in the low-voltage compartment 120; or the low-voltage cabinet described above can be arranged with the help of the structure of the low-voltage compartment 120, and the partition plates are fully welded to the perimeter of the container 110 to meet the electrical safety isolation requirements and IP54 protection level, so as to prevent accidental contact with live components in the lower compartment 300 during maintenance in the upper compartment 200.

[0028] In some embodiments of this application, the main focus is on the structure of the low-voltage switchgear and the arrangement of its internal components; therefore, see [link to relevant documentation]. Figures 1 to 4 Using the structure of container 110 as an example, the structure of the low-pressure cabinet is described.

[0029] Multiple PCS 250s are arranged within the upper compartment 200. In some embodiments of this application, for ease of arrangement of the PCS 250s, see [reference needed]. Figure 2 The upper compartment 200 is equipped with multiple PCS limiting units 210, with one PCS 250 arranged within one PCS limiting unit 210. See [reference needed]. Figure 2 It can be along the longitudinal direction of the low-voltage switchgear (see...) Figure 2 (Seen in the solid double-arrow diagram) Multiple PCS limiting guide rails 220 are installed above the layer partition plate. Each PCS limiting guide rail 220 corresponds to a PCS limiting unit 210. Thus, the PCS limiting guide rails 220 facilitate the installation of PCS 250 within the PCS limiting unit 210. See [reference needed]. Figure 1 .

[0030] In some embodiments of this application, see reference 1. Figure 1 Multiple PCS 250 can be divided into two parts: a first row of PCS 230 and a second row of PCS 240. Each row of PCS includes multiple PCS 250, and the first row of PCS 230 and the second row of PCS 240 are arranged side by side along the longitudinal direction of the low-voltage switchgear.

[0031] In some embodiments of this application, the number of PCS 230 in the first row is equal to the number of PCS 240 in the second row.

[0032] The lower compartment 300 houses the aforementioned control components. For ease of installation and maintenance of these control components, please refer to [reference needed]. Figure 3 and Figure 4 The multiple control components include a first group of control components 340 and a second group of control components 350. The number of components in the first group of control components 340 may be the same as or different from the number of components in the second group of control components 350.

[0033] In some embodiments of this application, the first group of control components 340 corresponds to the first row of PCS 230, and the second group of control components 350 corresponds to the second row of PCS 240. When the number of PCS 230 in the first row and the number of PCS 240 in the second row are equal, the number of the first group of control components 340 and the number of the second group of control components 350 are also equal, and they are of the same type.

[0034] During the charging and discharging process of the energy storage battery, the control components are switched on or off, generating a significant amount of heat. Therefore, to ensure their reliable operation, a heat dissipation channel for the control components is installed within the lower compartment 300. For this purpose, see [link to relevant documentation]. Figure 4 The lower compartment 300 includes a duct partition 330, a first cooling fan 361, and a second cooling fan 362.

[0035] Duct baffle 330 along the longitudinal direction (see Figure 4 (As shown by the double arrows in the solid line) is arranged in the lower compartment 300, dividing the lower compartment 300 into a first space 310 and a second space 320 on one side. The first space 310 and the second space 320 are respectively connected to the outside.

[0036] The first set of control components 340 is arranged in the first space 310, and the second set of control components 350 is arranged in the second space 320. The first cooling fan 361 is used in the first space 310, and the second cooling fan 362 is used in the second space 320.

[0037] See Figure 4 When the first cooling fan 361 is working, external airflow is introduced into the first space 310 and flows through the first space 310 in a direction consistent with the longitudinal extension direction of the air duct partition 330, for cooling the first group of control components 340 in the first space 310 (see airflow path). Figure 4(As indicated by the dashed arrow within the first space 310); when the second cooling fan 362 is operating, external airflow is introduced into the second space 320 and flows through the second space 320 in a direction consistent with the longitudinal extension direction of the air duct partition 330, for cooling the second set of control components 350 within the second space 320 (see airflow path). Figure 4 (As indicated by the dashed arrow within the second space 320).

[0038] In some embodiments of this application, see reference 1. Figure 1 and combined Figure 4 A first ventilation grille 371 and a second ventilation grille 372 are installed on the lower compartment 300. The first ventilation grille 371 corresponds to the first space 310, and the second ventilation grille 372 corresponds to the second space 320. A first cooling fan 361 is installed opposite to the first ventilation grille 371 on the lower compartment 300 (that is, the first ventilation grille 371 and the first cooling fan 361 are located opposite each other at both ends of the first space 310 in the direction consistent with the longitudinal extension direction of the air duct partition 330). The second cooling fan 362 is installed opposite to the second ventilation grille 372 on the lower compartment 300 (that is, the second ventilation grille 372 and the second cooling fan 362 are located opposite each other at both ends of the second space 320 in the direction consistent with the longitudinal extension direction of the air duct partition 330). Therefore, the external airflow introduced through the first ventilation grille 371 can flow through the first space 310 and then be discharged outside the lower compartment 300 under the driving action of the first cooling fan 361 (see airflow direction). Figure 4 (In the direction of the dashed arrow inside the first space 310), the external airflow introduced through the second ventilation grille 372, driven by the second cooling fan 362, can flow through the second space 320 and then be discharged outside the lower compartment 300 (see airflow direction). Figure 4 (The direction of the dashed arrow within the second space 320).

[0039] The control components described above may include multiple DC switches (e.g., DC molded case circuit breakers). Figure 4 The diagram shows a DC switch 341 and multiple AC fuses. Figure 4 The diagram shows an AC fuse 342, a first frame circuit breaker 343, and a second frame circuit breaker 351, wherein the number of multiple DC switches is equal to the number of multiple AC fuses and is equal to the total number of all PCS 250 in the upper compartment 200.

[0040] A DC switch, a PCS, and an AC fuse are connected in sequence to form a PCS branch.

[0041] In some embodiments of this application, when all PCS 250 are divided into a first row of PCS 230 and a second row of PCS 240 with an equal number of PSCs as described above, the parallel connection points of the multiple PCS branches corresponding to the first row of PCS 230 are connected to the first frame circuit breaker 343, and the parallel connection points of the multiple PCS branches corresponding to the second row of PCS 240 are connected to the second frame circuit breaker 351.

[0042] In some embodiments of this application, see reference 1. Figure 1 The container 110 also includes a transformer compartment 130 for housing a transformer (unmarked), which may be a split transformer.

[0043] The parallel connection points of the converter outputs in the multiple PCS branches corresponding to the first row of PCS 230 are connected to one low-voltage winding side of the double-split transformer through the first frame circuit breaker 343. The parallel connection points of the converter outputs in the multiple PCS branches corresponding to the second row of PCS 240 are connected to the other low-voltage winding side of the double-split transformer through the second frame circuit breaker 351.

[0044] In some embodiments of this application, see Figure 4 The first group of control components 340 includes multiple DC switches corresponding to multiple PCS branches in the first row of PCS230. Figure 4 Only DC switch 341 is shown in the image, along with multiple AC fuses. Figure 4 Only AC fuse 342 and first frame circuit breaker 343 are shown in the diagram; the second group of control components 350 includes multiple DC switches (unlabeled), multiple AC fuses (unlabeled), and second frame circuit breaker 351 corresponding to multiple PCS branches in the second row of PCS240.

[0045] In some embodiments of this application, in order to facilitate the arrangement and maintenance of multiple components, a first busbar 344 and a second busbar (not marked) are also arranged in the lower compartment 300.

[0046] Multiple AC fuses 342 corresponding to multiple PCS branches in the first row of PCS 230 are arranged longitudinally side by side and each is connected to the first busbar 344 by a cable. The first frame circuit breaker 343 is connected to the first busbar 344 by a copper busbar.

[0047] Multiple AC fuses corresponding to multiple PCS branches in the second row of PCS 240 are arranged longitudinally side by side and each is connected to the second busbar via cables. The second frame circuit breaker 351 is connected to the second busbar via copper busbars. The first busbar 344 is located on one side of the duct partition 330, and the second busbar is located on the other side of the duct partition 330. The length extension direction of the first busbar 344 and the second busbar is consistent with the longitudinal length extension direction of the duct partition 330.

[0048] In some embodiments of this application, see also [link to previous document]. Figure 4 To facilitate the switching operation of the DC switches, a horizontally arranged mounting beam 380 is also provided in the lower compartment 300. The air duct baffle 330 is perpendicularly connected to the mounting beam 380. All the DC switches 341 in the lower compartment 300 are arranged horizontally on the mounting beam 380 facing the first ventilation grille 371 and the second ventilation grille 372. This makes all the components in the first group of control components 340 except for the DC switches 341 arranged in the space on one side of the air duct baffle 330, and all the components in the second group of control components 350 except for the DC switches arranged in the space on the other side of the air duct baffle 330.

[0049] When the first ventilation grille 371 and the second ventilation grille 372 are disassembled and opened, it is convenient to maintain the DC switch, and it does not affect the external airflow entering the first space 310 and the second space 320 through the first ventilation grille 371 and the second ventilation grille 372 respectively.

[0050] To facilitate maintenance of components within the lower compartment 300, the lower compartment 300 is equipped with a separate access door (see...). Figure 2 Only the front access door 390 is shown in the image, which facilitates the maintenance and installation of the first busbar 344, the second busbar, the first frame circuit breaker 343, and the second frame circuit breaker 351. The space is relatively spacious, making it easy to operate large components.

[0051] As mentioned above, during the charging and discharging of the energy storage battery, the DC switch, PCS, AC fuse, and frame circuit breaker need to be connected in sequence. Therefore, the cable needs to pass through the layer partition to connect the corresponding control components in the lower compartment 200 to the PCS 250 in the upper compartment 300.

[0052] In some embodiments of this application, multiple wiring channels (not shown) are opened on the layer partition plate for passing cables that connect the corresponding control components to the PCS 250. That is, multiple DC switches 341 in the lower compartment 300 are connected to the corresponding PCS 250 in the upper compartment 200 through cables passing through the corresponding wiring channels, and the corresponding PCS 250 in the upper compartment 200 is connected to the corresponding AC fuse 342 in the lower compartment 300 through cables passing through the corresponding wiring channels. The interlayer connection cables are neatly routed through the wiring channels, which significantly reduces crossing.

[0053] Nylon cable ties, cable clips, and plastic cable trays are widely used in low-voltage cabinets to ensure that all cables are securely fixed, have clear routing, avoid sag and friction, and increase the safety of device layout.

[0054] In some embodiments of this application, see reference 1. Figure 2The layer partition is provided with a wire sealing device 280 corresponding to the wire passage, which is used to seal and isolate the upper compartment 200 and the lower compartment 300 at the corresponding wire passage.

[0055] In some embodiments of this application, see reference 1. Figure 1 Corresponding to the multiple PCS 250 in the upper compartment 200, the first row of PCS 230 and the second row of PCS 240 are arranged back to back, and the first row of PCS 230 is located above the first space 310, which facilitates connection with the first group of control components 340. The second row of PCS 240 is located above the second space 320, which facilitates connection with the second group of control components 350, and facilitates wiring and maintenance.

[0056] In order to dissipate heat from the PCS 250 in the upper compartment 200, each PCS 250 is equipped with an air guide device 260, which is used to guide the external airflow path to the corresponding PCS 250 through the air guide device 260. Then, with the help of the fan inside the PCS 250, the hot and cold airflow of the PCS 250 is guided to circulate along the path to remove the heat of the PCS 250 itself.

[0057] In some embodiments of this application, the air guide device 260 may be a ventilation grille.

[0058] All air guide devices 260 of the first row of PCS 230 and all air guide devices 260 of the second row of PCS 240 face away from each other towards the outside of the upper compartment 200, so as to avoid mutual interference of airflows.

[0059] In some embodiments of this application, see also [link to previous document]. Figure 1 The upper compartment 200 is open, meaning it is connected to the outside environment. Therefore, the outside airflow, after heat exchange with the PCS 250 through the air guide device 260, will be discharged into the outside environment. In this way, the outside airflow is used to fully dissipate heat from the PCS 250.

[0060] In some embodiments of this application, the transformer compartment 130 is also open and adjacent to the low-voltage compartment 120. The first cooling fan 361 and the second cooling fan 362 are installed on a common column of the low-voltage compartment 120 and the high-voltage compartment 140, and are used to discharge the heat exchange airflow drawn out by the first cooling fan 361 and the second cooling fan 362 through the transformer compartment 130 to the external environment.

[0061] In some embodiments of this application, the containerized substation is used outdoors. Therefore, the low-voltage cabinet is constructed by welding / bolting high-quality cold-rolled steel plate or weather-resistant steel plate with the container 110 body. The surface is treated with anti-corrosion powder coating to meet the outdoor anti-corrosion requirements of C5 level. The overall protection level of the cabinet is IP54, which effectively prevents dust, water, salt spray, and condensation (for example, a humidity sensor can be installed in the lower compartment 300, and an automatic temperature and humidity controller can be configured; a heater can be installed in the lower compartment 300 or in key areas, and heating and dehumidification can be automatically started when low temperature and high humidity (condensation risk) are detected).

[0062] And, see back Figure 2 A cabinet door 270 is located above the first ventilation grille 371 and the second ventilation grille 372 (e.g., using waterproof louvers) on the upper compartment 200. The cabinet door 270 is an external door panel structure, and silicone rubber sealing strips are used around the overlap of the door panel to ensure a seal. A door lock is installed on the door panel, and the door lock has anti-pry and rainproof functions.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A low-voltage switchgear, characterized in that, It includes: The upper compartment contains multiple PCS arranged side by side, which are used to connect to the energy storage battery. The lower compartment contains multiple control components, which are used to control the bidirectional charging and discharging between the energy storage battery and the transformer connected to the power grid. A partition plate is used to divide the low-voltage cabinet into the upper compartment and the lower compartment.

2. The low-voltage switchgear according to claim 1, characterized in that, The plurality of control components include a first group of control components and a second group of control components arranged side by side. The lower compartment also includes a duct partition, a first cooling fan, and a second cooling fan. The duct partition is arranged longitudinally and is used to divide the lower compartment into a first space and a second space. The first set of control components is located in the first space on one side of the duct partition, and the second set of control components is located in the second space on the other side of the duct partition. The first space and the second space are respectively connected to the outside world, and the outside airflow driven by the first cooling fan flows through the first space in a direction consistent with the longitudinal extension direction of the air duct partition, and the outside airflow driven by the second cooling fan flows through the second space in a direction consistent with the longitudinal extension direction of the air duct partition.

3. The low-voltage switchgear according to claim 2, characterized in that, Multiple control components include multiple DC switches, multiple AC fuses, a first frame circuit breaker, and a second frame circuit breaker. The number of multiple DC switches and multiple AC fuses are equal and equal to the total number of all PCS. A DC switch, a PCS, and an AC fuse for connecting an energy storage battery are connected in sequence to form a PCS branch; A portion of the PCS branch's parallel connection points are connected to the first frame circuit breaker, and another portion of the PCS branch's parallel connection points are connected to the second frame circuit breaker. The first group of control components includes multiple DC switches and multiple AC fuses corresponding to one part of the PCS branch, as well as a first frame circuit breaker. The second group of control components includes multiple DC switches and multiple AC fuses corresponding to another part of the PCS branch, as well as a second frame circuit breaker.

4. The low-voltage switchgear according to claim 3, characterized in that, The lower compartment is also equipped with an installation beam, which is perpendicularly connected to the air duct partition, and the multiple DC switches are arranged in parallel on the installation beam. In the first group of control components, multiple AC fuses and a first frame circuit breaker are located on one side of the duct partition, while in the second group of control components, multiple AC fuses and a second frame circuit breaker are located on the other side of the duct partition.

5. The low-voltage switchgear according to claim 2, characterized in that, The layer partition plate has multiple cable passages for passing through cables that connect the corresponding control components to the PCS. The layer partition plate is provided with a wire sealing device corresponding to the wire passage, which is used to seal and isolate the upper compartment and the lower compartment at the corresponding wire passage.

6. The low-voltage switchgear according to claim 3, characterized in that, The lower compartment is also equipped with a first busbar and a second busbar; The AC fuses corresponding to a portion of the PCS branches are arranged longitudinally side by side and each is connected to the first busbar via a cable; The AC fuses corresponding to the other part of the PCS branch are arranged longitudinally side by side and each is connected to the second busbar by a cable; The first frame circuit breaker is connected to the first busbar via a copper busbar, and the second frame circuit breaker is connected to the second busbar via a copper busbar.

7. The low-voltage switchgear according to claim 2, characterized in that, The lower compartment is equipped with a first ventilation grille and a second ventilation grille. The first ventilation grille corresponds to the first space, and external airflow is introduced into the first space through the first ventilation grille; The second ventilation grille corresponds to the second space, and external airflow is introduced into the second space through the second ventilation grille; The first cooling fan and the first ventilation grille are installed opposite each other on the lower compartment, and the first cooling fan draws the airflow in the first space out to the outside of the lower compartment; The second cooling fan is installed opposite to the second ventilation grille on the lower compartment, and the second cooling fan draws the airflow in the second space out to the outside of the lower compartment.

8. The low-voltage switchgear according to claim 2, characterized in that, The upper compartment is equipped with multiple PCS limiting units, with one PCS arranged within one PCS limiting unit; The plurality of PCS includes a first row of PCS and a second row of PCS arranged back to back, each row of PCS includes a plurality of PCS arranged longitudinally side by side, the first row of PCS is located above the first space, and the second row of PCS is located above the second space. Each PCS is also equipped with an air guiding device, which is used to guide the external airflow to the corresponding PCS in sections; All air guide devices of the first row of PCS and all air guide devices of the second row of PCS face away from each other and towards the outside of the upper compartment.

9. A containerized substation, characterized in that, It includes: A shipping container, wherein the container is divided into low-pressure compartments; According to any one of claims 1 to 8, the low-voltage cabinet is divided into an upper compartment and a lower compartment, wherein the upper compartment is an open compartment.

10. The containerized substation according to claim 9, characterized in that, The container also includes a transformer compartment, which is arranged adjacent to the low-voltage compartment. The containerized substation further includes: A transformer, which is placed in the transformer compartment.

Images