A compact low-voltage power distribution cabinet special for box transformer
By adopting a layered structure design and busbar system connection in the dedicated low-voltage distribution cabinet of the transformer substation, the problems of insufficient equipment space and unreasonable layout are solved, achieving equipment compactness and improved safety, and meeting the needs of large-capacity power distribution.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN KANGDEWEI TRANSFORMER CO LTD
- Filing Date
- 2025-04-01
- Publication Date
- 2026-07-14
AI Technical Summary
The existing low-voltage distribution cabinets for transformer substations have an unreasonable cabinet structure design, resulting in insufficient equipment installation space, making it difficult to meet the needs of large-capacity power distribution. Furthermore, the layout of cabinets with different functions lacks scientific design, affecting the operating efficiency and safety of the equipment.
The system adopts a two-layer structure design, with the metering cabinet, incoming line cabinet and compensation cabinet located on the upper layer and the outgoing line cabinet located on the lower layer. Each cabinet is connected by a busbar system and is equipped with an internal grounding protection device, which realizes a reasonable hierarchical layout and electrical connection of the equipment.
It improves the compactness of the equipment within a limited space, avoids mutual interference between cabinets, enhances the safety and stability of equipment operation, simplifies wiring connections, and improves operating efficiency and reliability.
Smart Images
Figure CN224502645U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of low-voltage distribution cabinet technology, specifically a compact low-voltage distribution cabinet for transformer substations. Background Technology
[0002] In modern power systems, prefabricated substations (box-type transformers), as a type of power equipment integrating transformers and high- and low-voltage distribution devices, are widely used in power supply systems in various locations. Low-voltage switchgear, as an important component of prefabricated substations, is used for the distribution, control, and protection of electrical energy.
[0003] However, existing low-voltage distribution cabinets specifically designed for prefabricated substations have some shortcomings. Their unreasonable cabinet structure design results in insufficient installation space, making it difficult to meet the demands of large-capacity power distribution. The layout of cabinets with different functions (such as metering cabinets, incoming line cabinets, compensation cabinets, and outgoing line cabinets) lacks scientific rigor, affecting equipment operating efficiency and safety. Therefore, there is a need for a compact low-voltage distribution cabinet specifically designed for prefabricated substations that can achieve a compact layout within limited space, improve equipment operating efficiency and safety, and meet the demands of large-capacity power distribution. Utility Model Content
[0004] The purpose of this utility model is to provide a compact low-voltage distribution cabinet for transformer substations with a structural design that places the metering cabinet, incoming line cabinet and compensation cabinet on the upper layer and the outgoing line cabinet on the lower layer. This design achieves a reasonable layout of equipment in a limited space, improves space utilization, and enhances the safety and efficiency of equipment operation to meet the needs of large-capacity power distribution.
[0005] To address the existing technical problems, this utility model provides a compact low-voltage distribution cabinet specifically designed for prefabricated substations. The cabinet includes a main unit with a two-tiered structure. A metering cabinet is located on one side of the upper tier, and a compensation cabinet is located on the other side. The upper tier also includes an incoming line cabinet, and the lower tier includes an outgoing line cabinet. The front, rear, left, and right sides of the main unit are equipped with openable doors for equipment installation, maintenance, and repair. The cabinet also contains a grounding protection device and a busbar system for electrical connections between the metering cabinet, incoming line cabinet, compensation cabinet, and outgoing line cabinet.
[0006] Preferably, the metering cabinet is equipped with several energy meters, current transformers and junction boxes for calculating electrical energy, and the metering cabinet is also equipped with a metering busbar for transmitting power, which connects the energy meters, current transformers and junction boxes.
[0007] Preferably, the incoming line cabinet is also equipped with a withdrawable circuit breaker, a multi-function instrument, and a measuring transformer for controlling and protecting low-voltage electrical energy. The withdrawable circuit breaker, the multi-function instrument, and the measuring transformer are electrically connected. The incoming line cabinet is also equipped with a main busbar for connecting to an external high-voltage power supply and converting the high-voltage electrical energy into low-voltage electrical energy before inputting it to the busbar system.
[0008] Preferably, the incoming line cabinet is further provided with an incoming line terminal block, which is located at the bottom of the metering cabinet.
[0009] Preferably, the compensation cabinet is equipped with a fuse isolating switch and a compensation controller for reactive power compensation of low-voltage power, and an intelligent capacitor is also installed inside the compensation cabinet near its bottom.
[0010] Preferably, the compensation cabinet is further provided with a compensation terminal block, which is located at the bottom of the compensation cabinet and is used for electrical connection to the bus system.
[0011] Preferably, the outgoing cabinet is also equipped with an isolating knife switch and a molded case circuit breaker for overload and short circuit protection and control of current. Each side panel of the main cabinet is also provided with a heat dissipation vent for heat dissipation. The heat dissipation vent is covered with a protective net to prevent foreign objects from entering the main cabinet. An exhaust fan is also provided on the top of the main cabinet.
[0012] Preferably, the outgoing cabinet is further provided with multiple outgoing terminal blocks, which are located at the bottom of the outgoing cabinet.
[0013] Preferably, the bus system includes a main bus and branch bus, with the main bus connecting the incoming line cabinet and the compensation cabinet.
[0014] Preferably, the grounding protection device includes a grounding busbar and grounding terminals disposed inside the main cabinet.
[0015] The advantages of this utility model compared to the prior art are:
[0016] 1. By placing the metering cabinet, incoming line cabinet, and compensation cabinet on the upper layer and the outgoing line cabinet on the lower layer, a reasonable layered layout of the equipment within the cabinet is achieved, making full use of the space within the cabinet, improving the compactness of the equipment, and meeting the large-capacity power distribution needs within a limited space.
[0017] 2. The layered structure design can effectively avoid mutual interference between cabinets with different functions, improve the safety and stability of equipment operation, and reduce the occurrence rate of equipment failure.
[0018] 3. The busbar system enables power transmission and distribution between various cabinets, simplifying wiring connections and improving equipment operating efficiency. The grounding protection device effectively ensures the safety of personnel and equipment during operation, improving equipment reliability. Attached Figure Description
[0019] Figure 1 This is a top view schematic diagram of a compact low-voltage distribution cabinet specifically designed for transformer substations according to this utility model.
[0020] Figure 2 This is a front view structural diagram of a compact low-voltage distribution cabinet specifically designed for transformer substations according to this utility model.
[0021] Figure 3 This is a schematic diagram of the key components of a compact low-voltage distribution cabinet for transformer substations, as per this utility model, during installation.
[0022] Figure 4 This is a schematic diagram of the internal structure of the metering chamber and the incoming line chamber of a compact low-voltage distribution cabinet for transformer substations according to this utility model.
[0023] Figure 5 This is a schematic diagram of the left side of the incoming and outgoing line cabinets of a compact low-voltage distribution cabinet for transformer substations according to this utility model.
[0024] Figure 6 This is a schematic diagram of the left side of the compensation cabinet and outgoing line cabinet of a compact low-voltage distribution cabinet for transformer substations according to this utility model.
[0025] The following are the labels in the diagram: 1. Metering cabinet; 11. Metering energy meter; 12. Metering transformer; 13. Junction box; 14. Metering busbar; 2. Incoming cabinet; 21. Withdrawn circuit breaker; 22. Multifunctional instrument; 23. Measuring transformer; 24. Main busbar; 3. Compensation cabinet; 31. Fuse isolating switch; 32. Compensation controller; 33. Intelligent capacitor; 34. Exhaust fan; 4. Outgoing cabinet; 41. Isolating switch; 42. Molded case circuit breaker; 43. Heat dissipation vent; 100. Main cabinet. Detailed Implementation
[0026] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.
[0027] Reference Figures 1-6As shown, this utility model provides a compact low-voltage distribution cabinet specifically designed for transformer substations, including a main cabinet 100. The main cabinet 100 has a two-layer structure and is used to house and protect the internal electrical equipment. The main cabinet 100 has waterproof, dustproof, heat insulation, and fireproof functions to ensure the normal operation of the internal equipment and the safety of personnel. The main cabinet 100 includes a top plate, a bottom plate, a front plate, a rear plate, a left side plate, and a right side plate, all of which are sealed together to form a sealed frame structure. A metering cabinet 1 is installed on one side of the upper structure of the main cabinet 100, and a compensation cabinet 3 is installed on the other side of the upper structure of the main cabinet 100. An incoming line cabinet 2 is also installed in the upper structure of the main cabinet 100, and an outgoing line cabinet 4 is installed in the lower structure of the main cabinet 100. The front panel, rear panel, left side panel, and right side panel of the main cabinet 100 are all equipped with openable cabinet doors for the installation, maintenance, and repair of the equipment. A grounding protection device is also installed inside the main cabinet 100. A busbar system for electrical connections between the metering cabinet 1, the incoming line cabinet 2, the compensation cabinet 3, and the outgoing line cabinet 4 is also installed inside the main cabinet 100.
[0028] By placing metering cabinet 1, incoming line cabinet 2, and compensation cabinet 3 on the upper layer, and outgoing line cabinet 4 on the lower layer, a reasonable layered layout of the equipment within the total cabinet 100 is achieved. This fully utilizes the space within the total cabinet 100, improves the compactness of the equipment, and meets the high-capacity power distribution requirements within a limited space. The layered structure design effectively avoids mutual interference between cabinets with different functions, improves the safety and stability of equipment operation, and reduces the incidence of equipment failure.
[0029] The metering cabinet 1 houses several energy meters 11, current transformers 12, and junction boxes 13 for calculating electrical energy. It also includes a metering busbar 14 for transmitting power, connecting the energy meters 11, current transformers 12, and junction boxes 13. The energy meters 11 are the core equipment of the metering cabinet 1, used to accurately measure and record the electrical energy passing through the circuit. The energy meters 11 display cumulative energy consumption, providing accurate data for electricity billing, energy management, and energy saving analysis. The junction box 13 provides convenient wiring terminals and a protective cover, ensuring the safety and reliability of the wiring. The metering busbar 14 is the power transmission channel within the metering cabinet 1, used to connect the energy meters 11, current transformers 12, and junction boxes 13. It is typically made of highly conductive materials, capable of withstanding large currents and ensuring stable power transmission.
[0030] The incoming line cabinet 2 also houses a withdrawable circuit breaker 21, a multi-function instrument 22, and a measuring transformer 23 for controlling and protecting low-voltage electrical energy. These components are electrically connected. The incoming line cabinet 2 also contains a main busbar 24 for connecting to an external high-voltage power supply and converting the high-voltage energy into low-voltage energy before inputting it to the busbar system. The incoming line cabinet 2 also contains an incoming line terminal block located at the bottom of the metering cabinet 1.
[0031] The withdrawable circuit breaker 21 is used for the control and protection of low-voltage electrical energy. When an overload, short circuit, or ground fault occurs in the circuit, the circuit breaker will automatically trip, cutting off the power supply and protecting the safety of the circuit and equipment. The multi-function instrument 22 is an instrument integrating multiple measurement functions, capable of displaying circuit parameters such as voltage, current, power, and power factor in real time. The multi-function instrument 22 provides comprehensive monitoring of the circuit status, offering crucial data support for the operation and maintenance of the power system.
[0032] The compensation cabinet 3 is equipped with a fuse isolating switch 31 and a compensation controller 32 for reactive power compensation of low-voltage electrical energy. A smart capacitor 33 is also located near the bottom of the compensation cabinet 3. The compensation cabinet 3 also contains a compensation terminal block located at the bottom for electrical connection to the busbar system.
[0033] The compensation controller 32 can automatically adjust the reactive power compensation amount according to the real-time situation of the power system, so that the power factor is kept within the set range. The intelligent capacitor 33 is a reactive power compensation device that integrates functions such as capacitor, discharge resistor, and overvoltage protection. The intelligent capacitor 33 can automatically start or stop operation according to the instructions of the compensation controller 32 to provide the necessary reactive power.
[0034] The outgoing cabinet 4 is also equipped with an isolating knife switch 41 and a molded case circuit breaker 42 for overload and short-circuit protection and control of current. Each side panel of the main cabinet 100 has a heat dissipation vent 43, which is covered with a protective mesh to prevent foreign objects from entering the main cabinet 100. An exhaust fan 34 is also installed on the top of the main cabinet 100. The outgoing cabinet 4 also contains multiple outgoing terminal blocks located at the bottom of the cabinet.
[0035] The isolating switch 41 is used to physically isolate current, ensuring personnel safety during equipment maintenance or replacement. When an overload or short circuit occurs in the circuit, the molded case circuit breaker 42 will automatically trip, cutting off the power supply and preventing equipment damage or fire.
[0036] The busbar system includes a main busbar and branch busbars. The main busbar connects the incoming line cabinet 2 and the compensation cabinet 3. The grounding protection device includes a grounding busbar and grounding terminals installed inside the main cabinet 100.
[0037] The busbar system enables power transmission and distribution between various cabinets, simplifying wiring connections and improving equipment operating efficiency. The grounding protection device effectively ensures the safety of personnel and equipment during operation, enhancing equipment reliability.
[0038] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.
Claims
1. A compact low-voltage distribution cabinet specifically designed for transformer substations, characterized in that: The system includes a main cabinet (100), which has a two-layer structure. A metering cabinet (1) is installed on one side of the upper layer of the main cabinet (100), and a compensation cabinet (3) is installed on the other side of the upper layer of the main cabinet (100). An incoming line cabinet (2) is also installed in the upper layer of the main cabinet (100), and an outgoing line cabinet (4) is installed in the lower layer of the main cabinet (100). The front, rear, left, and right sides of the main cabinet (100) are equipped with openable cabinet doors for the installation, maintenance, and repair of the equipment. A grounding protection device is also installed inside the main cabinet (100). A busbar system is also installed inside the main cabinet (100) for the electrical connection between the metering cabinet (1), the incoming line cabinet (2), the compensation cabinet (3), and the outgoing line cabinet (4).
2. The compact low-voltage distribution cabinet for transformer substations according to claim 1, characterized in that: The metering cabinet (1) is equipped with several metering energy meters (11), metering transformers (12) and junction boxes (13) for calculating electrical energy. The metering cabinet (1) is also equipped with a metering busbar (14) for transmitting power, which connects the metering energy meters (11), metering transformers (12) and junction boxes (13).
3. The compact low-voltage distribution cabinet for transformer substations according to claim 1, characterized in that: The incoming line cabinet (2) is also equipped with a withdrawable circuit breaker (21), a multi-function instrument (22) and a measuring transformer (23) for controlling and protecting low-voltage electrical energy. The withdrawable circuit breaker (21), the multi-function instrument (22) and the measuring transformer (23) are electrically connected. The incoming line cabinet (2) is also equipped with a main busbar (24) for connecting to an external high-voltage power supply and converting high-voltage electrical energy into low-voltage electrical energy before inputting it to the busbar system.
4. A compact low-voltage distribution cabinet for transformer substations according to claim 3, characterized in that: The incoming line cabinet (2) is also equipped with an incoming line terminal block, which is located at the bottom of the metering cabinet (1).
5. A compact low-voltage distribution cabinet for transformer substations according to claim 1, characterized in that: The compensation cabinet (3) is equipped with a fuse isolating switch (31) and a compensation controller (32) for reactive power compensation of low voltage power. The compensation cabinet (3) is also equipped with a smart capacitor (33) near its bottom.
6. A compact low-voltage distribution cabinet for transformer substations according to claim 5, characterized in that: The compensation cabinet (3) is also equipped with a compensation terminal block, which is located at the bottom of the compensation cabinet (3) and is used to make electrical connections to the bus system.
7. A compact low-voltage distribution cabinet for transformer substations according to claim 1, characterized in that: The outgoing cabinet (4) is also equipped with an isolating knife switch (41) and a molded case circuit breaker (42) for overload, short circuit protection and control of current. Each side panel of the main cabinet (100) is also provided with a heat dissipation vent (43) for heat dissipation. The heat dissipation vent (43) is covered with a protective net to prevent foreign objects from entering the main cabinet (100). The top of the main cabinet (100) is also equipped with an exhaust fan (34).
8. A compact low-voltage distribution cabinet for transformer substations according to claim 7, characterized in that: The outgoing cabinet (4) is also equipped with multiple outgoing terminal blocks, which are located at the bottom of the outgoing cabinet (4).
9. A compact low-voltage distribution cabinet for transformer substations according to claim 1, characterized in that: The bus system includes a main bus and branch bus, with the main bus connecting the incoming line cabinet (2) and the compensation cabinet (3).
10. A compact low-voltage distribution cabinet for transformer substations according to claim 1, characterized in that: The grounding protection device includes a grounding busbar and grounding terminals installed inside the main cabinet (100).