Integrated medium voltage electrical cabinet

Abstract

The application relates to the technical field of electrical equipment, and specifically discloses an integrated medium-voltage electrical cabinet which comprises a cabinet body, a metering trolley and a connecting assembly. The metering trolley is movably arranged in the cabinet body and comprises an insulating plate, a first movable contact arm, a second movable contact arm and a mutual inductor group. The insulating plate is detachably arranged in the cabinet body, the mutual inductor group is fixed to the insulating plate, the first movable contact arm and the second movable contact arm are installed on the mutual inductor group and electrically connected to the mutual inductor group. The connecting assembly comprises a first copper bar and a second copper bar. The first copper bar is provided with an in-coupling joint for connecting an external power supply, and the second copper bar is provided with an out-coupling joint for connecting a load. The application has the effect of improving the problems of large space occupation, high cost, inconvenient installation and operation and maintenance, and the flexible isolation and maintenance of the metering unit in the prior art.

Description

Technical Field

[0001] This application relates to the technical field of electrical equipment, and in particular to an integrated medium-voltage electrical cabinet. Background Technology

[0002] In traditional medium-voltage power distribution systems, to achieve energy metering and line protection functions at the 24kV voltage level, separate metering cabinets and booster cabinets (or protection cabinets) are usually required. This configuration requires two cabinets to be installed side by side, with each cabinet typically being at least 1000mm wide, resulting in a large overall footprint in the power distribution room.

[0003] In addition, the existing electrical cabinets require the manufacture of two separate cabinets, which increases the amount of raw materials used, such as cabinet steel plates, internal copper busbars, and insulation components, thus raising equipment costs. Furthermore, the two cabinets need to be hoisted, fixed, and connected to the primary circuit busbars separately during transportation, placement, and on-site installation, which not only increases the complexity of construction but also raises labor and time costs. Utility Model Content

[0004] In order to improve the problems of large space occupation, high cost, inconvenient installation and maintenance, and inability to flexibly isolate and repair metering units in the existing electrical cabinets, this application provides an integrated medium-voltage electrical cabinet.

[0005] The integrated medium-voltage electrical cabinet provided in this application adopts the following technical solution: An integrated medium-voltage electrical cabinet includes: Cabinet; The metering trolley is movably installed inside the cabinet and includes an insulating plate, a first movable contact arm, a second movable contact arm, and a current transformer group. The insulating plate is detachably installed inside the cabinet, the current transformer group is fixed to the insulating plate, and the first movable contact arm and the second movable contact arm are installed on the current transformer group and electrically connected to it. The connection assembly includes a first copper busbar and a second copper busbar. The first copper busbar is provided with an inlet interface for connecting to an external power source, and the second copper busbar is provided with an outlet interface for connecting to a load. When the metering trolley is in the working position, the first movable contact arm is electrically connected to the first copper busbar, and the second movable contact arm is electrically connected to the second copper busbar.

[0006] By adopting the above technical solution, the cabinet provides installation space and a rigid shell. The metering trolley is fixed inside the cabinet by an insulating plate and electrically connected to the connecting components via a moving contact arm. This improves the modularity and maintainability of the equipment, allows for quick plugging and unplugging and replacement while reducing power outage time, simplifies the structure, reduces the overall size, facilitates on-site testing and calibration by operators, and facilitates installation. The current transformer group is electrically connected to the first and second moving contact arms, enabling real-time detection of electrical parameters. The first and second moving contact arms can be electrically connected and disconnected. When the metering trolley is in the working position, it is electrically connected to the first and second copper busbars respectively, forming a current path. The connecting components are equipped with the first and second copper busbars, which can connect to external power sources and loads to realize the input and output of electrical energy, reducing installation complexity. Through the above settings, electrical metering and power distribution functions can be integrated, simplifying the number of devices, reducing the space occupied by the electrical cabinet, and minimizing maintenance downtime. This improves the problems of large space occupation, high cost, inconvenient installation and maintenance, and inflexible isolation and maintenance of metering units in existing technologies.

[0007] Preferably, the transformer group includes a metering current transformer and a metering voltage transformer; the metering current transformer is connected in series between the first moving contact arm and the second moving contact arm; the metering voltage transformer is connected in parallel between the first moving contact arm or the second moving contact arm and ground.

[0008] By adopting the above technical solution, the metering current transformer is connected in series between the first and second moving contact arms to measure the current passing through the main circuit. The metering voltage transformer is connected in parallel between the first or second moving contact arm and ground to measure the voltage to ground (i.e., phase voltage) and reflect the voltage level. When the metering trolley is in the working position, the first and second moving contact arms, the metering current transformer, the metering voltage transformer, and the first and second copper busbars together form a complete integrated power supply and metering circuit. The two transformers with different functions and different wiring methods are integrated on the same insulating board and integrated with the moving contact arm, realizing the integration of current and voltage measurement functions and saving cabinet space.

[0009] Preferably, both the first movable contact arm and the second movable contact arm are provided with wedge-shaped contacts at their ends.

[0010] By adopting the above technical solution, the wedge-shaped contact serves as the contact interface for the moving contact arm to electrically connect with the first and second copper busbars. It guides alignment and establishes electrical contact during insertion and removal. The wedge-shaped structure is typically designed to work in conjunction with a spring-loaded contact finger or a resilient stationary contact. When the contact is fully inserted, the wedge-shaped surface compresses the elastic element of the stationary contact, generating a continuous contact pressure to ensure the stability of the electrical connection.

[0011] Preferably, the first copper busbar is provided with a first stationary contact, and the first copper busbar is engaged with the wedge-shaped contact of the first moving contact arm through the first stationary contact; the second copper busbar is provided with a second stationary contact, and the second copper busbar is engaged with the wedge-shaped contact of the second moving contact arm through the second stationary contact.

[0012] By adopting the above technical solution, the first stationary contact and the second stationary contact are respectively set on the first copper busbar and the second copper busbar, which can serve as fixed electrical connection terminals to form a pluggable mating interface with the wedge-shaped plugs of the first and second moving contact arms on the metering trolley, thereby enabling the metering trolley to be connected to the circuit; when the metering trolley is pulled out, an air insulation gap is formed between the wedge-shaped contact and the stationary contact, providing electrical isolation for the equipment and operators, facilitating maintenance work, and improving the problem that the metering unit cannot flexibly isolate and repair.

[0013] Preferably, it also includes an electricity meter, which is mounted on the insulating plate and electrically connected to the metering current transformer and the metering voltage transformer.

[0014] By adopting the above technical solution, the electricity meter is installed on the insulating plate of the metering cart and is electrically connected to the metering current transformer and the metering voltage transformer. It can receive and process current and voltage signals, and display and / or output electrical energy data such as electricity quantity and power. The electricity meter, the metering current transformer and the metering voltage transformer are installed together on an insulating plate, which can form a complete metering module and improve the integration.

[0015] Preferably, it also includes an insulating cover, which is separately configured and sleeved on the outer wall of the first movable contact arm and the second movable contact arm.

[0016] By adopting the above technical solution, the insulating cover is fitted onto the outer wall of the first and second moving contact arms in a split structure, which can cover and wrap the moving contact arms, provide electrical insulation and mechanical protection, reduce the risk of electric shock, and improve operational safety.

[0017] Preferably, it also includes a handcart chassis, which is connected to the insulating plate, and the handcart chassis is grounded.

[0018] By adopting the above technical solution, the contacts or slide rails of the handcart chassis are grounded to the cabinet or the ground, which can conduct the current to the ground in case of leakage, avoid electric shock to the operator, protect the devices or equipment on the handcart, and improve safety.

[0019] Preferably, the cabinet has a width of 1000mm and a depth of 2260mm.

[0020] By adopting the above technical solution, in traditional medium-voltage power distribution systems, to achieve complete incoming line, metering and protection functions, multiple independent switch cabinets placed side by side are usually required, with a total width often exceeding 2000mm. However, the cabinet in this application has a width of 1000mm and a depth of 2260mm, which can effectively save floor space and thus improve the problems of large space occupation, high cost and inconvenient installation and maintenance of electrical cabinets in the prior art.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. The cabinet provides installation space and a rigid shell. The metering trolley is fixed inside the cabinet by an insulating plate and electrically connected to the connecting components via moving contact arms. This improves the modularity and maintainability of the equipment, allowing for quick plugging and unplugging and replacement while reducing power outage time. It simplifies the structure, reduces the overall size, facilitates on-site testing and calibration by operators, and is easy to install. The current transformer group is electrically connected to the first and second moving contact arms, enabling real-time detection of electrical parameters. The first and second moving contact arms can be electrically connected and disconnected. When the metering trolley is in the working position, it is electrically connected to the first and second copper busbars respectively, forming a current path. The connecting components are equipped with first and second copper busbars, which can connect to external power sources and loads to realize the input and output of electrical energy, reducing installation complexity. Through the above settings, electrical metering and power distribution functions can be integrated, simplifying the number of devices, reducing the space occupied by the electrical cabinet, and minimizing maintenance downtime. This improves the problems of large space occupation, high cost, inconvenient installation and maintenance, and inflexible isolation and maintenance of metering units in existing technologies. 2. The metering current transformer is connected in series between the first and second moving contact arms to measure the current passing through the main circuit. The metering voltage transformer is connected in parallel between the first or second moving contact arm and ground to measure the voltage to ground (i.e., phase voltage) and reflect the voltage level. When the metering trolley is in the working position, the first and second moving contact arms, the metering current transformer, the metering voltage transformer, and the first and second copper busbars together form a complete integrated power supply and metering circuit. The two transformers with different functions and different wiring methods are integrated on the same insulating board and integrated with the moving contact arm, realizing the integration of current and voltage measurement functions and saving cabinet space. 3. In traditional medium-voltage power distribution systems, to achieve complete incoming line, metering and protection functions, multiple independent switch cabinets placed side by side are usually required, with a total width often exceeding 2000mm. However, the cabinet in this application has a width of 1000mm and a depth of 2260mm, which can effectively save floor space and thus improve the problems of large space occupation, high cost and inconvenient installation and maintenance of electrical cabinets in the prior art. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the integrated medium-voltage electrical cabinet in the embodiments of this application; Figure 2 This is one of the internal structural schematic diagrams of the integrated medium-voltage electrical cabinet in the embodiments of this application; Figure 3 This is a schematic diagram of the metering cart in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of the connection component in an embodiment of this application; Figure 5 This is a schematic diagram of the handcart chassis in an embodiment of this application.

[0023] Explanation of reference numerals in the attached drawings: 1. Cabinet; 2. Metering trolley; 21. Insulating board; 22. First moving contact arm; 23. Second moving contact arm; 24. Transformer group; 241. Metering current transformer; 242. Metering voltage transformer; 3. Connecting assembly; 31. First copper busbar; 32. Second copper busbar; 4. Meter; 5. Insulating cover; 6. Trolley chassis. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0025] This application discloses an integrated medium-voltage electrical cabinet. (Refer to...) Figure 1 and Figure 2 The integrated medium-voltage electrical cabinet includes a cabinet body 1, a metering trolley 2, a connecting assembly 3, an electricity meter 4, and an insulating cover 5.

[0026] like Figure 1 and Figure 2 As shown, cabinet 1 has a width of 1000mm and a depth of 2260mm. In traditional medium-voltage power distribution systems, to achieve complete incoming line, metering, and protection functions, multiple independent switch cabinets placed side by side are usually required, with a total width often exceeding 2000mm. In contrast, cabinet 1 in this application has a width of 1000mm and a depth of 2260mm, which can effectively save floor space and improve the problems of large space occupation, high cost, and inconvenient installation and maintenance of electrical cabinets in the prior art. Cabinet 1 can provide installation space and a rigid shell. For example, in this embodiment, cabinet 1 is provided with an observation window to observe the interior of cabinet 1.

[0027] like Figure 3 and Figure 4As shown, the metering cart 2 is movably mounted inside the cabinet 1 via a horizontal slide rail. It includes an insulating plate 21, a first moving contact arm 22, a second moving contact arm 23, and a current transformer assembly 24. The insulating plate 21 is detachably mounted inside the cabinet 1, and the current transformer assembly 24 is fixed to the insulating plate 21. The first moving contact arm 22 and the second moving contact arm 23 are mounted on the current transformer assembly 24 and electrically connected to it. The metering cart 2 is fixed inside the cabinet 1 via the insulating plate 21 and electrically connected to the connecting assembly 3 via the moving contact arm. This improves the modularity and maintainability of the equipment, allows for quick plugging and unplugging and replacement while reducing power outage time, simplifies the structure, reduces the overall size, facilitates on-site testing and calibration by operators, and is easy to install.

[0028] In this embodiment, the transformer group 24 includes a metering current transformer 241 and a metering voltage transformer 242. The metering current transformer 241 is connected in series between the first moving contact arm 22 and the second moving contact arm 23. The metering voltage transformer 242 is connected in parallel between the first moving contact arm 22 or the second moving contact arm 23 and ground. The metering current transformer 241, connected in series between the first moving contact arm 22 and the second moving contact arm 23, is capable of measuring the current passing through the main circuit, while the metering voltage transformer 242, connected in parallel between the first moving contact arm 22 or the second moving contact arm 23, is capable of measuring the current passing through the main circuit. Between the metering trolley 2 and the ground, it can measure the voltage to ground (i.e., phase voltage) and reflect the voltage level. When the metering trolley 2 is in the working position, the first moving contact arm 22, the second moving contact arm 23, the metering current transformer 241, the metering voltage transformer 242, and the first copper busbar 31 and the second copper busbar 32 together form a complete integrated power supply and metering circuit. It integrates two transformers with different functions and different wiring methods on the same insulating plate 21 and integrates them with the moving contact arm, realizing the integration of current and voltage measurement functions and saving cabinet space.

[0029] It should be noted that, in this embodiment, both the first moving contact arm 22 and the second moving contact arm 23 are provided with wedge-shaped contacts at their ends. The wedge-shaped contacts serve as the contact interfaces for electrically connecting the moving contact arms with the first copper busbar 31 and the second copper busbar 32, guiding alignment and establishing electrical contact during insertion and removal. The wedge-shaped structure is typically designed to work in conjunction with spring-loaded contact fingers or elastic stationary contacts. When the contact is fully inserted, the wedge-shaped surface compresses the elastic element of the stationary contact, generating a continuous contact pressure to ensure the stability of the electrical connection.

[0030] like Figure 3 and Figure 4As shown, the connection component 3 includes a first copper busbar 31 and a second copper busbar 32. The first copper busbar 31 is provided with an inlet interface for connecting to an external power source, and the second copper busbar 32 is provided with an outlet interface for connecting to a load. When the metering trolley 2 is in the working position, the first moving contact arm 22 is electrically connected to the first copper busbar 31, and the second moving contact arm 23 is electrically connected to the second copper busbar 32. The current transformer group 24 is electrically connected to the first moving contact arm 22 and the second moving contact arm 23, and can detect electrical parameters in real time. The first moving contact arm 22 and the second moving contact arm 23 can realize electrical connection and disconnection. When the metering trolley 2 is in the working position, they are electrically connected to the first copper busbar 31 and the second copper busbar 32 respectively, forming a current path. The connection component 3 is provided with the first copper busbar 31 and the second copper busbar 32. The first copper busbar 31 and the second copper busbar 32 can connect to an external power source and a load, realize the input and output of electrical energy, and reduce the installation complexity.

[0031] In this embodiment, the first copper busbar 31 is provided with a first stationary contact, which is engaged with the wedge-shaped contact of the first moving contact arm 22. The second copper busbar 32 is provided with a second stationary contact, which is engaged with the wedge-shaped contact of the second moving contact arm 23. The first and second stationary contacts are respectively provided on the first copper busbar 31 and the second copper busbar 32, and can serve as fixed electrical connection terminals to form pluggable interfaces with the wedge-shaped plugs of the first and second moving contact arms 22 and 23 on the metering trolley 2, thereby enabling the metering trolley 2 to be connected to the circuit. When the metering trolley 2 is pulled out, an air insulation gap is formed between the wedge-shaped contact and the stationary contact, providing electrical isolation for the equipment and operators, facilitating maintenance work, and improving the problem that the metering unit cannot flexibly isolate and repair.

[0032] like Figure 3 and Figure 4 As shown, meter 4 is mounted on insulating plate 21 and electrically connected to metering current transformer 241 and metering voltage transformer 242. Meter 4 is mounted on insulating plate 21 of metering cart 2 and electrically connected to metering current transformer 241 and metering voltage transformer 242. It can receive and process current and voltage signals, and display and / or output electrical energy data such as power and quantity. Meter 4, metering current transformer 241 and metering voltage transformer 242 are mounted together on a single insulating plate 21, which can form a complete metering module, improve integration and reduce floor space.

[0033] It should be noted that the observation window of cabinet 1 is located opposite to the electricity meter 4, so that the electricity meter 4 can be observed when cabinet 1 is closed.

[0034] like Figure 4As shown, the insulating cover 5 is a split design, specifically consisting of two insulating sleeves, including but not limited to epoxy resin insulating sleeves or silicone rubber insulating sleeves. The two insulating sleeves are fitted onto the outer walls of the first moving contact arm 22 and the second moving contact arm 23, covering and wrapping the moving contact arms, providing electrical insulation and mechanical protection, reducing the risk of electric shock, and improving operational safety.

[0035] For example, please refer to Figure 5 In this embodiment of the application, the metering trolley 2 also includes a trolley chassis 6, which is connected to the insulating plate 21 and is grounded; the contacts or slide rails of the trolley chassis 6 are grounded to the cabinet 1 or the ground, which can conduct the current to the ground in case of leakage, avoid electric shock to the operator, and protect the devices or equipment on the trolley, thereby improving safety.

[0036] Specifically, by integrating the metering current transformer 241, metering voltage transformer 242, electricity meter 4, and connecting moving contact arm onto the movable metering trolley 2 and placing them in a single cabinet 1, the redundant structure of the traditional separate cabinets is reduced, saving floor space and equipment raw materials, and simplifying the initial installation work.

[0037] The modular design of the metering trolley solves the problems of inconvenient operation and maintenance and flexible repair. It is easy to transport and reduces costs. It can ensure the reliability of electrical connections in the working state and achieve physical isolation and replacement through simple removal operations. It can reduce equipment downtime, improve operation and maintenance efficiency and system security, and improve the problems of large space occupation, high cost, inconvenient installation and operation and maintenance of electrical cabinets, as well as the inability to flexibly isolate and repair metering units in existing technologies.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An integrated medium-voltage electrical cabinet, characterized in that, include: Cabinet (1); The metering cart (2) is movably installed inside the cabinet (1) and includes an insulating plate (21), a first movable contact arm (22), a second movable contact arm (23), and a current transformer group (24). The insulating plate (21) is detachably installed in the cabinet (1), and the current transformer group (24) is fixed to the insulating plate (21). The first movable contact arm (22) and the second movable contact arm (23) are installed in the current transformer group (24) and electrically connected to it. The connecting component (3) includes a first copper busbar (31) and a second copper busbar (32). The first copper busbar (31) is provided with an inlet interface for connecting to an external power source, and the second copper busbar (32) is provided with an outlet interface for connecting to a load. When the metering trolley (2) is in the working position, the first movable contact arm (22) is electrically connected to the first copper busbar (31), and the second movable contact arm (23) is electrically connected to the second copper busbar (32).

2. An integrated medium-voltage electrical cabinet according to claim 1, characterized in that: The transformer group (24) includes a metering current transformer (241) and a metering voltage transformer (242); the metering current transformer (241) is connected in series between the first moving contact arm (22) and the second moving contact arm (23); the metering voltage transformer (242) is connected in parallel between the first moving contact arm (22) or the second moving contact arm (23) and the ground.

3. An integrated medium-voltage electrical cabinet according to claim 1, characterized in that: Both the first movable contact arm (22) and the second movable contact arm (23) are provided with wedge-shaped contacts at their ends.

4. An integrated medium-voltage electrical cabinet according to claim 3, characterized in that: The first copper busbar (31) is provided with a first stationary contact, and the first copper busbar (31) is engaged with the wedge-shaped contact of the first moving contact arm (22) through the first stationary contact; the second copper busbar (32) is provided with a second stationary contact, and the second copper busbar (32) is engaged with the wedge-shaped contact of the second moving contact arm (23) through the second stationary contact.

5. An integrated medium-voltage electrical cabinet according to claim 2, characterized in that: It also includes an electricity meter (4), which is mounted on the insulating plate (21) and electrically connected to the metering current transformer (241) and the metering voltage transformer (242).

6. An integrated medium-voltage electrical cabinet according to claim 1, characterized in that: It also includes an insulating cover (5), which is a separate unit and is fitted onto the outer wall of the first movable contact arm (22) and the second movable contact arm (23).

7. An integrated medium-voltage electrical cabinet according to claim 1, characterized in that: It also includes a handcart chassis (6), which is connected to the insulating plate (21) and is grounded.

8. An integrated medium-voltage electrical cabinet according to claim 1, characterized in that: The cabinet (1) has a width of 1000mm and a depth of 2260mm.

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