Low-voltage switch cabinet

Abstract

The utility model provides a low-voltage switch cabinet, which comprises a low-voltage segmented cabinet and a direct-current top box, the low-voltage segmented cabinet is provided with an automatic switching device, the direct-current top box is provided with a direct-current power supply device, the direct-current power supply device is electrically connected with the automatic switching device and can provide direct current for the automatic switching device, and the direct-current top box is positioned above the low-voltage segmented cabinet. According to the utility model, the problem of low power supply reliability of the PLC device in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the field of electrical equipment, in particular to a low-voltage switch cabinet. Background Art

[0002] The existing 0.4kV low-voltage sectionalized backup automatic switching device in the low-voltage distribution network utilizes a multifunctional automatic switching device (PLC). Power is drawn from the AC power within the low-voltage sectionalized cabinet, enabling five functional states: automatic switching with automatic restoration, automatic switching with manual restoration, manual, closed-loop, and remote / local. The multifunctional automatic switching device (PLC) is often used in dual-power switching systems, equipped with a closed-loop transfer switch to select both incoming lines and the bus tie breaker.

[0003] Existing multifunctional automatic switching devices (PLCs) are mostly suitable for basic wiring configurations with two power sources and one segment. As the demand for power supply reliability in medium and low voltage distribution networks continues to increase, wiring configurations are becoming increasingly complex, such as four power sources and one segment, or four-segment ring connections consisting of four transformers. These complex wiring configurations place higher demands on operational methods. PLCs are not widely used in substations with complex wiring configurations, and operational experience is limited, so their reliability remains questionable. To improve power supply reliability, distribution rooms at voltage levels of 10kV and above are equipped with DC power systems (DC 110V / 220V) to power station protection devices and other equipment. This ensures that critical equipment and devices in the substation continue to operate with battery backup power in the event of an AC power outage, improving substation power reliability. However, PLCs rely on AC power from the low-voltage switchgear. If the AC power fails, the switching function cannot be completed, reducing substation reliability. Utility Model Content

[0004] The main purpose of the utility model is to provide a low-voltage switch cabinet to solve the problem of low power supply reliability of PLC devices in the prior art.

[0005] In order to achieve the above-mentioned purpose, a low-voltage switchgear is provided, including a low-voltage segmented cabinet and a DC top box. The low-voltage segmented cabinet has an automatic transfer device, and the DC top box has a DC power supply device. The DC power supply device is electrically connected to the automatic transfer device and can provide DC power to the automatic transfer device. The DC top box is located above the low-voltage segmented cabinet.

[0006] Furthermore, the orthographic projection of the DC top box on the upper surface of the low-voltage segmented cabinet from top to bottom is located within the range of the upper surface of the low-voltage segmented cabinet.

[0007] Furthermore, the outermost parts of the DC top box and the low-voltage switch cabinet are both rectangular parallelepipeds, and the outermost longitudinal side surfaces of the DC top box are aligned vertically with the outermost longitudinal side surfaces of the low-voltage segment cabinet.

[0008] Furthermore, the DC top box includes a shell having a DC charging compartment and a battery compartment. The DC power supply device includes a switching power module, a feeder switch and a battery electrically connected to each other. The switching power module and the feeder switch are arranged in the DC charging compartment, and the battery is arranged in the battery compartment.

[0009] Furthermore, the DC top box also includes a side plate, which is arranged in the shell, and the DC charging compartment and the battery compartment are separated by the side plate.

[0010] Furthermore, the shell has a first side surface and a second side surface opposite to each other, the first side surface is the side facing users, and the DC charging compartment and the battery compartment are arranged in sequence from the first side surface to the second side surface.

[0011] Furthermore, the shell includes a plurality of plates, which form the shell, and the plates are cold-rolled galvanized steel plates or aluminum-magnesium alloy plates.

[0012] Furthermore, the DC charging compartment has multiple installation areas, and the switching power supply module and the feeder switch are respectively arranged in different installation areas.

[0013] Furthermore, there are multiple batteries, and at least some of the batteries are arranged in the battery compartment in the transverse direction and / or the longitudinal direction.

[0014] Furthermore, the sum of the heights of the DC top box and the low-voltage segmented cabinet shall not exceed the floor height of the distribution room.

[0015] The technical solution of this utility model improves the reliability of the power supply to the automatic resetting device by providing a DC top box. On the one hand, a DC power supply device is installed in the DC top box to provide DC power to the automatic resetting device, meeting the power supply needs of the automatic resetting device in the event of AC power failure. On the other hand, the DC top box is located above the low-voltage sectionalizing cabinet and does not occupy the space of the distribution room separately. These two aspects enable the DC top box to provide a reliable DC power supply to the automatic resetting device, thereby improving the reliability of the distribution room, while also saving space and reducing the difficulty of distribution room renovation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 Shows a front view of the low-voltage switchgear of the present utility model;

[0018] Figure 2 shows a side view of a low voltage switchgear;

[0019] Figure 3 Shown is a rear view of a low-voltage switchgear cabinet.

[0020] The above drawings include the following reference numerals:

[0021] 10. Low-voltage sectionalizing cabinet; 20. DC top box; 21. Housing; 211. DC charging compartment; 212. Battery compartment; 22. Side panel. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0024] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings, or with reference to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0025] In order to solve the problem of low power supply reliability of PLC devices in the prior art, the utility model provides a low-voltage switch cabinet.

[0026] like Figures 1 to 3 The low-voltage switchgear shown includes a low-voltage segmented cabinet 10 and a DC top box 20. The low-voltage segmented cabinet 10 has an automatic switching device, and the DC top box 20 has a DC power supply device. The DC power supply device is electrically connected to the automatic switching device and can provide DC power to the automatic switching device. The DC top box 20 is located above the low-voltage segmented cabinet 10.

[0027] This embodiment improves the reliability of the automatic switching device's power supply by providing a DC top box 20. Firstly, a DC power supply device is installed within the DC top box 20, providing DC power to the automatic switching device, meeting its power supply needs in the event of an AC power failure. Secondly, the DC top box 20 is located above the low-voltage sectionalizer 10, eliminating its separate space in the power distribution room. These two aspects enable the DC top box 20 to provide a reliable DC power source for the automatic switching device, thereby improving the reliability of the power distribution room, while also saving space and reducing the difficulty of power distribution room renovation.

[0028] It should be noted that the up and down direction of this embodiment refers to the longitudinal direction in the conventional sense, that is, the DC top box 20 and the low voltage segment cabinet 10 are arranged up and down, that is, Figure 1In the up and down direction, the DC top box 20 only needs to occupy the space above the low-voltage segment cabinet 10, and no additional space is required.

[0029] In this embodiment, the orthographic projection of the DC top box 20 on the upper surface of the low-voltage segmentation cabinet 10 is located within the upper surface of the low-voltage segmentation cabinet 10. In other words, the outer edge of the DC top box 20 does not extend beyond the outer edge of the low-voltage segmentation cabinet 10 in the vertical direction. As a result, the DC top box 20 only needs to occupy the space directly above the low-voltage segmentation cabinet 10 and does not need to occupy any additional space horizontally. This avoids occupying space used by other equipment in the power distribution room, thereby reducing the difficulty of power distribution room renovation.

[0030] In this embodiment, the outermost parts of the DC top box 20 and the low-voltage segmented cabinet 10 are both rectangular parallelepipeds, and the outermost longitudinal side surfaces of the DC top box 20 are aligned vertically with the outermost longitudinal side surfaces of the low-voltage segmented cabinet 10. In this way, the limited space can be fully utilized without occupying the space used by other equipment. Moreover, the DC top box 20 and the low-voltage segmented cabinet 10 are arranged adjacent to each other, which facilitates the wiring and power supply of the automatic switching device, and helps reduce the wiring complexity of the low-voltage switch cabinet.

[0031] Of course, the specific upper and lower arrangements of the DC top box 20 and the low-voltage segmented cabinet 10 can also be adjusted as needed. For example, the shell portions of the DC top box 20 and the low-voltage segmented cabinet 10 can be arranged in a split manner, that is, the two are relatively independent and can be transported and installed completely separately; or the shell portions of the two can be arranged in an integrated manner, that is, the upper portion is divided into the DC top box 20 and the lower portion is divided into the low-voltage segmented cabinet 10 within a large shell. Naturally, if the modification is taken into consideration, the DC top box 20 is generally arranged independently and is only supported and placed above the low-voltage segmented cabinet 10.

[0032] In this embodiment, the DC top box 20 includes a housing 21, and the DC power supply device is housed within the housing 21. More specifically, the housing 21 has a DC charging compartment 211 and a battery compartment 212. The DC power supply device includes a switching power module, a feeder switch, and a battery that are electrically connected to each other. The switching power module and the feeder switch are located within the DC charging compartment 211, and the battery is located within the battery compartment 212. In this way, the DC charging compartment 211 serves as a control room, and the battery compartment 212 serves as a power supply room, thereby providing a reliable power source for the automatic transfer device and facilitating its management and control. This embodiment is equipped with two switching power modules and five feeder switches to meet the power supply requirements of the automatic transfer device.

[0033] In this embodiment, the DC top box 20 further includes a side panel 22 disposed within the housing 21. The side panel 22 separates the DC charging compartment 211 from the battery compartment 212. The side panel 22 can be made of a non-conductive or flame-retardant material. This separates the power supply and control functions. This separation helps ensure the safety of the battery, switching power supply module, and feeder switch, preventing a failure in one device from affecting the others and causing a collective failure. Furthermore, separating the switching power supply module and feeder switch from the battery facilitates operator access to the switching power supply module and feeder switch.

[0034] In this embodiment, the housing 21 has a first side surface and a second side surface facing each other. The first side surface is the side that people use, that is, the front side. The DC charging compartment 211 and the battery compartment 212 are arranged in sequence from the first side surface to the second side surface. In other words, the DC charging compartment 211 and the battery compartment 212 are arranged in a front-to-back arrangement relative to the person. In this way, the DC charging compartment 211 is arranged on the side facing the operator to facilitate its operation. The battery compartment 212 is a device that does not require frequent operation, and is arranged on the side away from the operator. It should be noted that the front side mentioned above refers to the Figure 2 The left side, the back side refers to Figure 2 Of course, the specific layout of the DC charging compartment 211 and the battery compartment 212 can also be adjusted as needed, and can also be arranged on the left and right sides, or arranged up and down, etc., as long as it can meet the actual wiring requirements.

[0035] In this embodiment, the shell 21 includes a plurality of plates, which form the shell 21. Since the DC top box 20 of this embodiment is located above the low-voltage segmented cabinet 10, the bottom of the shell 21 can directly utilize the top plate of the low-voltage segmented cabinet 10. At this time, the shell 21 is surrounded by an inverted concave structure with an open bottom. When placed above the low-voltage segmented cabinet 10, the bottom opening is naturally blocked by the low-voltage segmented cabinet 10. Alternatively, the shell 21 can be arranged in a surrounded form. At this time, the plates are divided into side plates, top plates and bottom plates, wherein the side plates are circumferentially surrounded by a cylindrical structure, and the top plate and the bottom plate are respectively located on the upper and lower sides of the side plates, so that the shell 21 forms a closed structure, and one of the side plates can be opened and closed to form a door panel.

[0036] Preferably, the plate body of this embodiment is a cold-rolled galvanized steel plate or an aluminum-magnesium alloy plate to ensure the strength of the housing 21, thereby ensuring the safety of the DC power supply device. Of course, the plate body can also use other materials that can meet the use requirements.

[0037] Preferably, the protection level of the housing 21 of the DC top box 20 is not lower than IP41 to better protect the internal battery, switching power supply module and feeder switch.

[0038] In this embodiment, the DC charging compartment 211 has multiple installation areas, and the switching power supply module and the feeder switch are respectively arranged in different installation areas. The installation areas can be arranged horizontally, vertically, etc., so that components of the same type can be installed in the same installation area, thereby distinguishing different components and facilitating the operation of the operator.

[0039] In this embodiment, there are multiple batteries, and at least some of the batteries are arranged horizontally and / or vertically within the battery compartment 212 to save space. Specifically, the batteries in this embodiment are provided with nine batteries, which can provide a DC 110V DC power supply to the automatic switching device, so that in the event of an AC power outage, the batteries can continue to discharge for one hour. The batteries are arranged in three rows and three columns to fully utilize the space above the low-voltage segmented cabinet 10. The batteries are connected in series to provide a wider range of voltages for the automatic switching device. Of course, according to actual needs, the batteries can be provided in any number, and the arrangement of the batteries can also be arranged in other ways according to the size of the DC top box 20 and the size of the batteries.

[0040] In this embodiment, taking into account the floor height restriction of the distribution station, the sum of the heights of the DC top box 20 and the low-voltage segmented cabinet 10 is not greater than the floor height of the distribution room, to ensure that the DC top box 20 and the low-voltage segmented cabinet 10 can be placed in the existing distribution room, avoiding increasing the difficulty of the transformation of the distribution room.

[0041] It should be noted that, in the above embodiments, a plurality refers to at least two.

[0042] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0043] 1. Provide DC power to the automatic switching device to meet the power supply needs of the automatic switching device in the event of AC power failure;

[0044] 2. The DC top box is located above the low-voltage sectional cabinet and does not occupy the space of the distribution room separately;

[0045] 3. This will improve the reliability of the distribution room, save space, and reduce the difficulty of distribution room renovation.

[0046] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0047] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0048] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A low voltage switchgear, characterized in that: include: A low-voltage segmented cabinet (10), wherein the low-voltage segmented cabinet (10) has an automatic switching device; A DC top box (20) is provided with a DC power supply device, the DC power supply device is electrically connected to the automatic switching device and can provide DC power to the automatic switching device, and the DC top box (20) is located above the low-voltage segment cabinet (10).

2. The low-voltage switchgear according to claim 1, characterized in that: The orthographic projection of the DC top box (20) from top to bottom on the upper surface of the low-voltage segment cabinet (10) is located within the range of the upper surface of the low-voltage segment cabinet (10).

3. The low-voltage switchgear according to claim 2, characterized in that: The outermost portions of the DC top box (20) and the low-voltage switch cabinet are both rectangular parallelepipeds, and the outermost longitudinal side surfaces of the DC top box (20) are aligned vertically with the outermost longitudinal side surfaces of the low-voltage sectionalizing cabinet (10).

4. The low-voltage switchgear according to claim 1, characterized in that: The DC top box (20) includes a shell (21), the shell (21) has a DC charging compartment (211) and a battery compartment (212), the DC power supply device includes a switching power module, a feeder switch and a battery electrically connected to each other, the switching power module and the feeder switch are arranged in the DC charging compartment (211), and the battery is arranged in the battery compartment (212).

5. The low-voltage switchgear according to claim 4, characterized in that: The DC top box (20) further includes a side plate (22), which is arranged in the housing (21), and the DC charging compartment (211) and the battery compartment (212) are separated by the side plate (22).

6. The low-voltage switchgear according to claim 4, characterized in that: The housing (21) has a first side surface and a second side surface facing each other, the first side surface being the side facing users, and the DC charging compartment (211) and the battery compartment (212) are arranged in sequence along the direction from the first side surface to the second side surface.

7. The low-voltage switchgear according to claim 4, characterized in that: The shell (21) comprises a plurality of plates, which enclose the shell (21), and the plates are cold-rolled galvanized steel plates or aluminum-magnesium alloy plates.

8. The low-voltage switchgear according to claim 4, characterized in that: The DC charging compartment (211) has a plurality of installation areas, and the switching power supply module and the feeder switch are respectively arranged in different installation areas.

9. The low-voltage switchgear according to claim 4, characterized in that: There are a plurality of batteries, and at least some of the batteries are arranged in the battery compartment (212) in a transverse and / or longitudinal direction.

10. The low-voltage switchgear according to claim 1, characterized in that: The sum of the heights of the DC top box (20) and the low-voltage segment cabinet (10) is not greater than the floor height of the power distribution room.

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