New energy box transformer substation low-voltage cabinet

Abstract

The utility model discloses a new energy box transformer substation low-voltage cabinet, which is characterized in that a frame circuit breaker is arranged in the upper half part of a cabinet body, the upper opening of the frame circuit breaker is connected with a low-voltage wire inlet copper bar extending from front to back, and the lower opening of the frame circuit breaker is connected with a low-voltage wire outlet copper bar extending from top to bottom; the lower end of the low-voltage outgoing line copper bar is connected with a low-voltage bus copper bar which is transversely fixed between the left side wall and the right side wall of the cabinet body in an insulating mode, a maintenance compartment is arranged outside the right side wall of the cabinet body, and a miniature circuit breaker, a relay and a wiring terminal are installed in the maintenance compartment. According to the utility model, the low-voltage power distribution device is transferred into the maintenance compartment on the right side of the low-voltage cabinet body, so that the risk of electric shock caused by operation personnel entering the cabinet body can be effectively avoided, the problem of inconvenient operation caused by limited space of the cabinet body can be effectively solved, and the low-voltage cabinet has the advantages of modularization, integration and convenience.

Description

Technical Field

[0001] This utility model relates to the field of switchgear technology, and more specifically, it is a low-voltage switchgear for new energy transformer substations. Background Technology

[0002] As an indispensable part of wind and photovoltaic power generation systems, new energy transformer substations have been widely used and promoted globally. These devices typically consist of three main parts: a high-voltage switchgear, a transformer cabinet, and a low-voltage switchgear. Specifically, the low-voltage switchgear mainly houses frame circuit breakers, control transformers, miniature circuit breakers, relays, and terminal blocks. However, in traditional designs, all these electrical components are often concentrated in a relatively compact cabinet. For example, the low-voltage unit for a new energy transformer substation disclosed in Chinese Utility Model Patent Specification CN221380092U dated July 19, 2024, illustrates this configuration. This configuration, due to the over-concentration of components, leads to overcrowding inside the cabinet. This not only complicates and times installation and disassembly, reducing work efficiency, but also inconveniences maintenance personnel operating inside the cabinet. Furthermore, the congested space increases the risk of damaging electrical equipment. More seriously, during maintenance, maintenance personnel may accidentally come into contact with exposed live areas in the low-voltage cabinet (mainly the low-voltage incoming and outgoing copper busbars connected to the frame circuit breaker), which may not only damage the electrical equipment but also pose a threat to the safety of the maintenance personnel. Utility Model Content

[0003] To address the technical problems of inconvenient maintenance and electric shock risks during the maintenance of existing low-voltage switchgear for new energy transformer substations, this utility model innovatively provides a new energy transformer substation low-voltage switchgear that can effectively avoid the risk of electric shock caused by maintenance personnel entering the cabinet for operation, and can also effectively solve the problem of inconvenient operation due to limited cabinet space. It also has the advantages of modularity, integration, and convenience.

[0004] To achieve the above-mentioned technical objectives, this utility model discloses a low-voltage switchgear for new energy transformer substations, including a cabinet. A frame circuit breaker is installed in the upper half of the cabinet. A low-voltage incoming copper busbar extending from front to back is connected to the upper end of the frame circuit breaker, and a low-voltage outgoing copper busbar extending from top to bottom is connected to the lower end of the frame circuit breaker. A low-voltage busbar is horizontally insulated and fixed between the left and right side walls of the cabinet. A maintenance compartment is provided outside the right side wall of the cabinet, and a miniature circuit breaker, a relay, and a terminal block are installed in the maintenance compartment.

[0005] Furthermore, this utility model provides a new energy transformer low-voltage switchgear, wherein an axial flow fan mounting bracket is provided on the lower rear side of the switchgear. The axial flow fan mounting bracket is Z-shaped, with the middle part of the Z-shape inclined from top to bottom and from back to front, and the middle part of the Z-shape is provided with two mounting holes arranged on the left and right.

[0006] Furthermore, this utility model provides a new energy transformer low-voltage switchgear, wherein a low-voltage switchgear sheet metal bracket is fixed to the upper rear side of the switchgear, and the left-view cross-section of the low-voltage switchgear sheet metal bracket is U-shaped with the opening facing upward.

[0007] Furthermore, in this utility model, a new energy transformer low-voltage switchgear is provided, wherein a front cable tray and a rear cable tray are fixed in the maintenance compartment, the front cable tray and the rear cable tray are spaced apart, and a plurality of intermediate cable trays are fixed between the front cable tray and the rear cable tray, the plurality of intermediate cable trays are evenly spaced from top to bottom, and a retaining rail is fixed above each intermediate cable tray, and the miniature circuit breaker, relay and terminal block are all snapped onto the retaining rail.

[0008] Furthermore, this utility model provides a new energy transformer low-voltage switchgear, wherein the front side of the switchgear is provided with a left door panel and a right door panel. The left door panel is equipped with a fluorescent fiber optic temperature measuring device, a meter, a temperature and humidity controller and a socket, and the right door panel is equipped with a power control terminal, a measurement and control device, a frame circuit breaker panel, indicator lights, buttons and connecting plates.

[0009] Furthermore, this utility model discloses a new energy transformer low-voltage switchgear, wherein a UPS host and a control transformer are installed on the outside of the left side wall of the switchgear, and the UPS host is located above the control transformer.

[0010] Furthermore, in this utility model, a new energy transformer low-voltage switchgear is provided, wherein a dehumidifier is installed on the side of the switchgear closest to the maintenance compartment.

[0011] Furthermore, in this utility model, a low-voltage switchgear for a new energy transformer is provided, wherein a current transformer is fitted onto the low-voltage outgoing copper busbar.

[0012] Furthermore, this utility model discloses a new energy transformer low-voltage switchgear, wherein a left busbar clamp is fixed on the left side of the cabinet body, and a right busbar clamp matching the left busbar clamp is fixed on the right side of the cabinet body. Both the left and right busbar clamps are provided with insertion holes in the middle. The left and right ends of the low-voltage busbar copper busbar are respectively inserted into the insertion holes of the left and right busbar clamps. Both the left and right busbar clamps are made of insulating material.

[0013] Furthermore, in this utility model, a new energy transformer low-voltage switchgear is provided, wherein the lower end of the low-voltage busbar copper bus is fixed with multiple copper lugs.

[0014] The difference between this utility model and the prior art lies in the following: This utility model features a cabinet with a frame circuit breaker installed in the upper half. A low-voltage incoming copper busbar extending from front to back is connected to the upper end of the frame circuit breaker, and a low-voltage outgoing copper busbar extending from top to bottom is connected to the lower end of the frame circuit breaker. A horizontally insulated low-voltage busbar is connected to the lower end of the low-voltage outgoing copper busbar, which is fixed between the left and right side walls of the cabinet. A maintenance compartment is located outside the right side wall of the cabinet, housing miniature circuit breakers, relays, and terminal blocks. This constitutes a modular, integrated, and convenient new energy transformer low-voltage cabinet. In practical use, the cabinet is used in conjunction with the transformer cabinet, connecting the low-voltage incoming copper busbar to the low-voltage output side of the transformer. Power is distributed through the low-voltage busbar and the miniature circuit breakers, relays, and terminal blocks in the maintenance compartment. This utility model moves all power distribution components to the maintenance compartment on the right side wall of the low-voltage cabinet, separating the maintenance compartment from the exposed live areas inside the cabinet. This makes the layout of the low-voltage cabinet more compact, ensures the safety of maintenance personnel when repairing power distribution components, and provides ample maintenance space for maintenance personnel, no longer limited by the space inside the cabinet. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a new energy transformer low-voltage switchgear according to the present invention;

[0016] Figure 2 This is a three-dimensional structural diagram of a new energy transformer low-voltage switchgear according to this utility model from another angle;

[0017] Figure 3 This is a right-side structural schematic diagram of a new energy transformer low-voltage switchgear according to this utility model. Detailed Implementation

[0018] The following is a detailed explanation and description of a new energy transformer low-voltage switchgear according to the present invention, with reference to the accompanying drawings.

[0019] like Figure 1As shown, this utility model discloses a low-voltage switchgear for a new energy transformer substation, including a cabinet 1. A frame circuit breaker 2 is installed in the upper part of the cabinet 1. A low-voltage incoming copper busbar 3 extending from front to back is connected to the upper end of the frame circuit breaker 2, and a low-voltage outgoing copper busbar 4 extending from top to bottom is connected to the lower end of the frame circuit breaker 2. A low-voltage busbar 5, horizontally insulated and fixed between the left and right side walls of the cabinet 1, is connected to the lower end of the low-voltage outgoing copper busbar 4. A maintenance compartment 6 is provided outside the right side wall of the cabinet 1. A miniature circuit breaker, relay, and terminal block are installed in the maintenance compartment 6. This constitutes a modular, integrated, and convenient low-voltage switchgear for a new energy transformer substation. In actual use, the cabinet 1 is used in conjunction with the transformer cabinet. The low-voltage incoming copper busbar 3 is connected to the low-voltage output side of the transformer, and power is supplied through the low-voltage busbar 5 and the miniature circuit breaker, relay, and terminal block in the maintenance compartment 6. This utility model moves all power distribution components to the maintenance compartment 6 on the right side wall outside the low-voltage cabinet 1, separating the maintenance compartment 6 from the exposed live areas inside the cabinet 1. This makes the layout inside the low-voltage cabinet more compact, ensures the safety of maintenance personnel when inspecting power distribution components, and provides ample maintenance space for maintenance personnel, no longer limited by the space inside the cabinet 1.

[0020] like Figure 2 As shown, an axial fan mounting bracket 7 is provided on the lower rear side of the cabinet 1. The axial fan mounting bracket 7 is shaped like a Z, with the middle part of the Z-shape tilted from top to bottom and from back to front. Two mounting holes 71 are provided in the middle of the Z-shape (one on the left and one on the right). The axial fan mounting bracket 7 is used to install the axial fan. When installing the axial fan, the outer wall of the axial fan is installed inside the mounting holes 71, so that the air outlet of the axial fan faces inward towards the cabinet 1. Due to the tilt angle of the axial fan mounting bracket 7, the contact area between the airflow direction of the axial fan and the low-voltage incoming copper busbar 3, low-voltage outgoing copper busbar, and low-voltage busbar 5 connected to the frame circuit breaker 2 is maximized, thereby improving the heat dissipation effect.

[0021] like Figure 3 As shown, a low-voltage switchgear sheet metal bracket 8 is fixed to the upper rear side of the cabinet 1, and the left-view cross-section of the low-voltage switchgear sheet metal bracket 8 is U-shaped with the opening facing upward. During assembly, one end of the low-voltage switchgear sheet metal bracket is fixed to the cabinet 1 of the low-voltage switchgear, and the other end is fixedly connected to the cabinet 1 of the transformer cabinet, thereby achieving the purpose of fixing the low-voltage switchgear, ensuring the stability of the low-voltage switchgear during transportation and maintenance, and ensuring the safety of assembly construction.

[0022] like Figure 3As shown, a front cable tray 61 and a rear cable tray 62 are fixed inside the maintenance compartment 6, spaced apart from each other. Multiple intermediate cable trays 63 are fixed between the front and rear cable trays 61 and 62, evenly spaced from top to bottom. Each intermediate cable tray 63 has a mounting rail fixed above it, securing miniature circuit breakers, relays, and terminals. This allows the wiring of the miniature circuit breakers, relays, and terminals to be routed within the cable trays, ensuring neat wiring in the maintenance compartment 6 and facilitating subsequent maintenance.

[0023] like Figure 1 and combined Figure 2 As shown, a UPS host 13 and a control transformer 14 are installed on the outside of the left side wall of the cabinet 1. The UPS host 13 is located on the upper side of the control transformer 14. A dehumidifier 15 is installed inside the cabinet 1 on the side near the maintenance compartment 6, and a current transformer 41 is installed on the low-voltage outgoing copper busbar 4.

[0024] like Figure 1 As shown, the low-voltage cabinet doors are designed to open in a double-opening manner. A left door panel 11 and a right door panel 12 are located on the front side of cabinet 1, with a 1:3 area ratio between the left and right door panels 11 and 12. The left door panel 11 is equipped with a fluorescent fiber optic temperature measuring device 111, a meter 112, a temperature and humidity controller 113, and a socket 114. The fluorescent fiber optic temperature measuring device 111 can be configured with 9 or 6 temperature measurement points to monitor the temperature of the low-voltage incoming copper busbar 3, low-voltage outgoing copper busbar 4, and low-voltage busbar 5 inside cabinet 1 in real time. The meter 112 can be a voltmeter, ammeter, etc. The temperature and humidity controller 113 can monitor the temperature inside the low-voltage cabinet in real time to activate the axial flow fan or dehumidifier 15 for cooling or dehumidification, ensuring that the temperature and humidity inside the low-voltage cabinet remain stable within a suitable range to meet the normal operating conditions of the equipment inside. The socket 114 can be used for temporary power supply. The right door panel 12 is equipped with a power control terminal 121, a measurement and control device 122, a frame circuit breaker 2 panel, indicator lights 123, buttons, and connecting plates 124. The functional zoning layout of the door panel components makes the wiring on the low-voltage cabinet door panel more orderly and neat, facilitating component installation and maintenance.

[0025] like Figure 2As shown, a left busbar clamp 51 is fixed on the left side inside the cabinet 1, and a right busbar clamp 51 matching the left busbar clamp 51 is fixed on the right side inside the cabinet 1. Both the left and right busbar clamps 51 have insertion holes in the middle, so that the left and right ends of the low-voltage busbar copper bus 5 are inserted into the insertion holes of the left and right busbar clamps 51 respectively to fix the low-voltage busbar copper bus 5. Both the left and right busbar clamps 51 are made of insulating material. Multiple copper lugs 52 are fixed at the lower end of the low-voltage busbar copper bus 5. Cables can be connected to miniature circuit breakers for power distribution through the copper lugs 52, making the connection faster and more convenient.

[0026] like Figure 1 As shown, lifting rings are provided at the four corners of the top of cabinet 1, which facilitates the hoisting or moving of the low-voltage cabinet.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In the description of this specification, the references to terms such as "this embodiment," "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0030] Furthermore, 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and simple improvements made on the substantive content of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A low-voltage switchgear for new energy transformer substations, characterized in that: The device includes a cabinet, the upper half of which houses a frame circuit breaker. The upper end of the frame circuit breaker is connected to a low-voltage incoming copper busbar extending from front to back, and the lower end of the frame circuit breaker is connected to a low-voltage outgoing copper busbar extending from top to bottom. The lower end of the low-voltage outgoing copper busbar is connected to a low-voltage busbar that is horizontally insulated and fixed between the left and right side walls of the cabinet. A maintenance compartment is provided on the outside of the right side wall of the cabinet, and miniature circuit breakers, relays, and terminals are installed in the maintenance compartment.

2. The low-voltage switchgear for a new energy transformer substation according to claim 1, characterized in that: An axial fan mounting bracket is provided on the lower rear side of the cabinet. The axial fan mounting bracket is Z-shaped, with the middle part of the Z-shape inclined from top to bottom and from back to front. The middle part of the Z-shape has two mounting holes arranged on the left and right.

3. The low-voltage switchgear for a new energy transformer substation according to claim 2, characterized in that: A low-voltage cabinet sheet metal bracket is fixed to the upper rear side of the cabinet. The left-view cross-section of the low-voltage cabinet sheet metal bracket is U-shaped with the opening facing upward.

4. A new energy transformer substation low-voltage switchgear according to claim 3, characterized in that: The maintenance compartment is equipped with a front cable tray and a rear cable tray, which are spaced apart. Multiple intermediate cable trays are fixed between the front and rear cable trays, and are evenly spaced from top to bottom. Each intermediate cable tray is secured with a rail above it, and the miniature circuit breaker, relay, and terminal block are all secured to the rail.

5. A new energy transformer substation low-voltage switchgear according to claim 4, characterized in that: The front of the cabinet is provided with a left door panel and a right door panel. The left door panel is equipped with a fluorescent fiber optic temperature measuring device, a meter, a temperature and humidity controller and a socket. The right door panel is equipped with a power control terminal, a measurement and control device, a frame circuit breaker panel, indicator lights, buttons and connecting plates.

6. A new energy transformer substation low-voltage switchgear according to claim 5, characterized in that: The UPS host and control transformer are installed on the outside of the left side wall of the cabinet, with the UPS host located above the control transformer.

7. A new energy transformer substation low-voltage switchgear according to claim 6, characterized in that: A dehumidifier is installed inside the cabinet on the side closest to the maintenance compartment.

8. A new energy transformer substation low-voltage switchgear according to claim 7, characterized in that: A current transformer is fitted onto the low-voltage outgoing copper busbar.

9. A new energy transformer substation low-voltage switchgear according to claim 8, characterized in that: A left busbar clamp is fixed on the left side of the cabinet body, and a right busbar clamp matching the left busbar clamp is fixed on the right side of the cabinet body. Both the left and right busbar clamps are provided with insertion holes in the middle. The left and right ends of the low-voltage busbar copper busbar are respectively inserted into the insertion holes of the left and right busbar clamps. Both the left and right busbar clamps are made of insulating material.

10. A new energy transformer substation low-voltage switchgear according to claim 9, characterized in that: The lower end of the low-voltage busbar copper bus is fixed with multiple copper wire lugs.

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