Power management device and system

Abstract

The embodiment of the utility model discloses a power management device and system. The power management device comprises at least two transformers; the buses are in one-to-one correspondence with the transformers; the buses are electrically connected through the switches, and the buses are electrically connected with the corresponding transformers through the switches; the looped networks are electrically connected with the bus through switches, each looped network is provided with a respective distribution box, and the distribution box is a multi-stage distribution box. The power management device and system provided by the embodiment of the utility model can realize reasonable configuration of the power management device.

Description

Technical Field

[0001] The embodiments of the present utility model relate to power management technology, and in particular to a power management device and system. Background Art

[0002] For sites with power supply needs, such as construction sites, it is necessary to comprehensively plan power management and reasonably allocate power to ensure the smooth progress of work activities. Currently, existing power management devices have the problem of unreasonable configuration. Utility Model Content

[0003] The embodiments of the present invention provide a power management device and system to achieve reasonable configuration of the power management device.

[0004] In a first aspect, an embodiment of the present invention provides a power management device, comprising:

[0005] At least two transformers;

[0006] busbars corresponding one to one with the transformers;

[0007] A plurality of switches, wherein the busbars are electrically connected to each other via switches, and the busbars are electrically connected to the corresponding transformers via switches;

[0008] A multi-circuit ring network, wherein the ring network is electrically connected to the busbar through a switch, and each ring network is provided with its own distribution box, which is a multi-stage distribution box.

[0009] Optionally, the multi-level distribution box includes a level 1 distribution box, a level 2 distribution box and a level 3 distribution box that are electrically connected in sequence.

[0010] Optionally, the power management device is applied to a factory building, the distribution of the level 1 distribution boxes is set according to the floors of the factory building, the distribution of the level 2 distribution boxes is set according to the rooms or areas on the floors, and the distribution of the level 3 distribution boxes is set according to the types of work in the rooms or areas.

[0011] Optionally, the at least two transformers include a first transformer and a second transformer, the bus corresponding to the first transformer is a first bus, the bus corresponding to the second transformer is a second bus, the first transformer is a working transformer, and the second transformer is a standby transformer.

[0012] Optionally, each ring network includes two ring network switches, and the ring network is electrically connected to the first busbar through one of the ring network switches, and is electrically connected to the second busbar through the other ring network switch.

[0013] Optionally, the multiple switches include a first switch, a second switch and a third switch, the first busbar is electrically connected to the first transformer through the first switch, the second busbar is electrically connected to the second transformer through the second switch, and the first busbar is electrically connected to the second busbar through the third switch.

[0014] Optionally, the high-voltage end of the transformer is electrically connected to the power grid, and the low-voltage end of the transformer is electrically connected to the corresponding busbar through a switch.

[0015] Optionally, the busbar is a medium voltage busbar.

[0016] In a second aspect, an embodiment of the present invention provides a power management system, comprising the power management device as described in the first aspect, and further comprising a cable tray, through which the lines in the power management device are routed.

[0017] Optionally, the cable trays are numbered.

[0018] The power management device and system provided by the embodiments of the present invention include: at least two transformers; busbars corresponding to the transformers; multiple switches, with the busbars electrically connected to each other via switches, and the busbars electrically connected to the corresponding transformers via switches; a multi-circuit ring network, with the ring network electrically connected to the busbars via switches, and each ring network is provided with its own distribution box, which is a multi-level distribution box. The power management device and system provided by the embodiments of the present invention, by providing at least two transformers, can ensure power supply reliability by allowing at least one transformer to serve as a backup transformer when at least one transformer is operating. Furthermore, the power management device can allocate distribution boxes at different levels according to the actual application scenario, achieving hierarchical protection and reasonable configuration of the power management device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural block diagram of a power management device provided by an embodiment of the present utility model;

[0020] Figure 2 It is a structural schematic diagram of a cable bridge provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0022] Figure 1 This is a schematic diagram of the structure of a power management device provided by an embodiment of the present utility model. Figure 1 The power management device includes: at least two transformers, busbars corresponding to the transformers, multiple switches, and a multi-way ring network; wherein the busbars are electrically connected to each other through switches, and the busbars are electrically connected to the corresponding transformers through switches; the ring network is electrically connected to the busbars through switches, and each ring network is provided with its own distribution box, which is a multi-level distribution box.

[0023] Specifically, the power management device can be a construction power management device, which provides power to equipment requiring power. For example, two transformers are provided, with the high-voltage side of the transformer connected to the power grid, and the low-voltage side of the transformer electrically connected to the corresponding busbar via a switch. Power from the power grid is transmitted to the busbar via the transformer, and then to ring networks 1-N (N is a positive integer greater than 2). The distribution boxes within the ring network distribute the power transmitted from the transformer to the ring network via the busbar and then transmit it to the equipment requiring power. At least one transformer serves as a working transformer, and at least one transformer serves as a backup transformer to ensure power supply reliability. Multi-level distribution boxes can be configured with different protection parameters based on the characteristics of different electrical equipment and loads. For example, for critical equipment, highly sensitive protection devices, such as leakage protectors and overvoltage protectors, can be installed in the lower-level distribution boxes to ensure timely power interruption in the event of an electrical fault, protecting equipment and personnel. For common loads, relatively simpler protection devices, such as circuit breakers and fuses, can be installed in the upper-level distribution boxes to achieve hierarchical protection.

[0024] Furthermore, a hierarchical distribution box layout can effectively prevent electrical fires. By installing appropriate overload and short-circuit protection devices at different levels, overload and short-circuit currents can be detected and shut off promptly, preventing fires caused by overheated wires. Furthermore, multi-level distribution boxes can monitor and protect against leakage current, preventing electric shock and fire accidents caused by leakage. Multi-level distribution boxes can divide power management devices into different control zones, facilitating the management and maintenance of electrical equipment in different areas. For example, in a large factory, separate distribution boxes can be installed for different areas such as production workshops, office buildings, and warehouses. This allows for independent monitoring and control of power usage in each area, improving efficiency and reducing management costs. Multi-level distribution boxes facilitate the installation of backup power sources. In the event of a main power failure, backup power sources can be quickly switched at different levels to ensure continuous power supply to critical loads. Multi-level distribution boxes are easily expandable. When new electrical equipment or loads are needed, new distribution boxes or circuits can be added at the appropriate level without significantly impacting the overall power management system. This flexible scalability allows multi-level distribution boxes to adapt to power consumption sites of varying sizes and development needs. Multi-level distribution boxes can also be equipped with reactive power compensation devices at different levels to improve power quality. Reactive power compensation reduces the flow of reactive power in the grid, lowers line losses, and improves the power factor, thereby improving voltage stability and power quality. For example, installing reactive power compensation capacitors in the lower-level distribution box where large electrical equipment resides can effectively improve the power factor of that equipment and reduce the reactive power demand from the upper-level distribution box. Multi-level distribution boxes can also suppress harmonics. By installing devices such as harmonic filters or active power filters at different levels, they effectively suppress harmonic currents and improve power quality. For example, in locations with high power quality requirements, such as electronics factories and laboratories, harmonic suppression devices can be installed in both the upper-level and lower-level distribution boxes to ensure power quality.

[0025] Furthermore, when a multi-level distribution box is configured, current matching between upper and lower level distribution boxes is essential. To achieve this, the actual current requirements of the electrical equipment connected to each level of distribution box must be determined. The capacity of the upper level distribution box should exceed the total load current of the lower level distribution boxes. The switchgear, busbars, and other components of the upper level distribution box should have sufficient capacity to accommodate potential load increases and short-term overloads. Typically, the capacity of the upper level distribution box can be selected as a multiple of the total load current of the lower level distribution boxes. The switchgear of the lower level distribution box should be appropriately selected based on the current of the connected loads. The rated current of the switches should be slightly greater than the maximum operating current of the loads to ensure frequent tripping during normal operation. The short-circuit breaking capacity and overload protection characteristics of the switches should also be considered to ensure that the loads are protected. Overcurrent protection devices, such as circuit breakers and fuses, can be installed in upper and lower level distribution boxes. The setting value of the overcurrent protection device should be appropriately set based on the load current and the short-circuit capacity of the device. The overcurrent protection setting of the upstream distribution box should be greater than that of the downstream distribution box to achieve selective protection. For example, if a short circuit occurs in a downstream distribution box, the overcurrent protection device in the downstream distribution box should operate first, shutting off the fault current. The overcurrent protection device in the upstream distribution box should not operate to ensure normal power supply to other non-faulty areas. If a leakage protection device is required, the leakage protection devices in the upstream and downstream distribution boxes must be coordinated. Generally, the leakage current of the upstream distribution box should be greater than that of the downstream distribution box to prevent false activation of the upstream leakage protection device due to leakage in the downstream. At the same time, the leakage protection device's operating time should meet the requirements of selective protection. After the distribution box is installed, commissioning is required, including checking the current matching between the upstream and downstream distribution boxes. The current matching should be verified by measuring the load current and the operating parameters of the switchgear. If the current matching is not correct, the switchgear settings should be adjusted or inappropriate components should be replaced. The distribution box also needs to be monitored regularly to observe changes in load current. If the load current exceeds the expected range, the cause should be analyzed in a timely manner and corresponding measures should be taken, such as adjusting the load distribution, replacing larger capacity switchgear, etc., to ensure that the current matching of the upper and lower distribution boxes is always in good condition.

[0026] It should be noted that Figure 1 The number of transformers and busbars is for illustrative purposes only and can be determined based on actual management needs, so there is no limitation here.

[0027] The power management device provided in this embodiment includes: at least two transformers; busbars corresponding to the transformers; multiple switches, with the busbars electrically connected to each other via switches, and the busbars electrically connected to the corresponding transformers via switches; a multi-circuit ring network, with the ring network electrically connected to the busbars via switches, and each ring network being provided with its own distribution box, each of which is a multi-level distribution box. The power management device provided in this embodiment, by providing at least two transformers, ensures power supply reliability by allowing at least one transformer to serve as a backup transformer when at least one transformer is operating. Furthermore, the power management device can allocate distribution boxes to different levels according to actual application scenarios, achieving hierarchical protection and reasonable configuration of the power management device.

[0028] Optionally, the multi-level distribution box includes a level 1 distribution box, a level 2 distribution box and a level 3 distribution box that are electrically connected in sequence.

[0029] Specifically, such as Figure 1 As shown, taking ring network 2 as an example, ring network 2 is provided with a level 1 distribution box, a level 2 distribution box, and a level 3 distribution box, with at least one distribution box at each level. The level 1 distribution box is the upper level distribution box of the level 2 distribution box, and the level 2 distribution box is the upper level distribution box of the level 3 distribution box. Conversely, the level 3 distribution box is the lower level distribution box of the level 2 distribution box, and the level 2 distribution box is the lower level distribution box of the level 1 distribution box. The upper distribution box transmits power to the lower level distribution box (usually the number of upper distribution boxes is less than the number of lower distribution boxes). When a distribution box at a certain level fails, it only affects the power supply area at that level and below, and will not affect the entire power management device, thus achieving isolation of faults at different levels. For example, if a device on a certain line fails, the power supply can be quickly cut off at the lower level distribution box near the fault point, while the upper distribution box and other lines can still supply power normally, thereby improving the reliability of the entire power management device.

[0030] Optionally, the power management device is applied to factory buildings, and the distribution of level 1 distribution boxes is set according to the floors of the factory buildings, the distribution of level 2 distribution boxes is set according to the rooms or areas on the floors, and the distribution of level 3 distribution boxes is set according to the types of work in the rooms or areas.

[0031] For example, a level 1 distribution box is set up on each floor of the factory building, a level 2 distribution box is set up in each room of each floor, and a level 3 distribution box is set up for the different work stations in each room. For example, if the factory building has five floors and ten rooms on each floor, five level 1 distribution boxes are required to be distributed on floors one to five, and ten level 2 distribution boxes are required on each floor to be distributed in each room of the floor. If a room only requires welding work, then the room only needs one level 3 distribution box. If a room requires welding and grinding work, then the room needs two level 3 distribution boxes. If each floor is divided into five work areas, then each floor needs five level 2 distribution boxes to be distributed in each work area of ​​the floor. If a work area has two types of work, such as welding and grinding, then the work area needs two level 3 distribution boxes corresponding to the two types of work to meet actual work needs.

[0032] refer to Figure 1 Optionally, the at least two transformers include a first transformer 11 and a second transformer 12, the bus corresponding to the first transformer 11 is the first bus 21, the bus corresponding to the second transformer 12 is the second bus 22, the first transformer 11 is the working transformer, and the second transformer 12 is the standby transformer.

[0033] Specifically, when the first transformer 11 is operating, the switch electrically connected to the first transformer 11 is closed, the second transformer 12 serves as a backup, and the switch electrically connected to the second transformer 12 is opened. When the first transformer 11 requires maintenance, the switch electrically connected to the first transformer 11 is opened, and the switch electrically connected to the second transformer 12 is turned on, and the second transformer 12 operates. A redundant configuration is adopted, with the capacity of each transformer set to meet actual power supply needs, achieving one in use and one in backup, so that one transformer can provide power while the other is under maintenance, ensuring power supply reliability.

[0034] refer to Figure 1 Optionally, each ring network includes two ring network switches, and the ring network is electrically connected to the first bus 21 through one of the ring network switches, and is electrically connected to the second bus 22 through the other ring network switch.

[0035] Specifically, a ring network switch 1A in ring network 1 is electrically connected to the first busbar 21, another ring network switch 1B in ring network 1 is electrically connected to the second busbar 22, a ring network switch 2A in ring network 2 is electrically connected to the first busbar 21, another ring network switch 2B in ring network 2 is electrically connected to the second busbar 22, ..., a ring network switch NA in ring network N is electrically connected to the first busbar 21, and another ring network switch NB in ​​ring network N is electrically connected to the second busbar 22. When a ring network requires power, all ring network switches in that ring network are closed, and the power from the busbars is transmitted to the distribution boxes in the ring network through the ring network switches. When the ring network does not need power, all ring network switches in that ring network are opened to prevent safety issues caused by live ring network.

[0036] refer to Figure 1 Optionally, the multiple switches include a first switch K1, a second switch K2 and a third switch K3, the first bus 21 is electrically connected to the first transformer 11 through the first switch K1, the second bus 22 is electrically connected to the second transformer 12 through the second switch K2, and the first bus 21 is electrically connected to the second bus 22 through the third switch K3.

[0037] Specifically, when the first transformer 11 needs to operate, the first switch K1 is closed, the second switch K2 is opened, and the third switch K3 is closed. Power is supplied to the first bus 21 and the second bus 22 through the first transformer 11, ensuring power supply reliability. When the first transformer 11 requires maintenance, the first switch K1 is opened, the second switch K2 and the third switch K3 are closed, and power is supplied to the first bus 21 and the second bus 22 through the second transformer 12, ensuring power supply reliability.

[0038] Optionally, the high-voltage end of the transformer is electrically connected to the power grid, and the low-voltage end of the transformer is electrically connected to a corresponding busbar through a switch, and the busbar is a medium-voltage busbar.

[0039] The high-voltage side of the transformer transmits grid power to the transformer, which then steps it down and transmits the resulting power to the busbar through the low-voltage side of the transformer to meet power supply needs. Furthermore, the voltage level of the medium-voltage busbar typically ranges from several kilovolts to tens of kilovolts, such as 10kV and 35kV. This allows for power transmission over certain distances without the stringent insulation and safety requirements of high-voltage busbars. Furthermore, it offers greater transmission capacity and longer transmission distances than low-voltage busbars. Medium-voltage busbars are typically capable of carrying high currents and are commonly used to power large-scale electricity users, such as industrial enterprises and commercial buildings, where power loads are relatively high. For example, the medium-voltage busbars of large factories can carry thousands of amperes to meet the operating needs of various production equipment. Due to the voltage and current characteristics of the medium-voltage busbar, power transmission losses are relatively low. Compared to the low-voltage busbar, the medium-voltage busbar carries less current at the same power level, resulting in lower line resistance losses. Furthermore, medium-voltage busbars offer excellent insulation performance, reducing leakage and dielectric loss, thereby improving power transmission efficiency. Medium-voltage busbars can be installed in a variety of ways, including overhead, cable tray, and bus duct installation. Overhead installation is suitable for outdoor locations, offering advantages such as low cost and easy maintenance. Cable tray installation is suitable for both indoor and outdoor cable routing, protecting the busbar from environmental influences. Bus duct installation offers aesthetic appeal, minimal space, and ease of installation, making it suitable for locations with limited space requirements. Medium-voltage busbars typically utilize a compact design to minimize space usage. For example, bus ducts typically consist of a metal casing and internal conductive bars. The casing provides protection and grounding, while the conductive bars are densely arranged to increase current-carrying capacity. Furthermore, the connection sections of medium-voltage busbars are meticulously designed to ensure reliable connections and good contact, reducing contact resistance and heat generation. Medium-voltage busbars are typically equipped with comprehensive protective devices, such as overcurrent protection, overvoltage protection, and grounding protection, to promptly shut off power in the event of a fault, protecting equipment and personnel. For example, overcurrent protection devices can quickly activate when the current exceeds the rated value, preventing busbar damage due to overload. Grounding protection devices can promptly divert fault current to the ground in the event of a ground fault, preventing electric shock accidents. Medium-voltage busbars are typically designed and manufactured using high quality standards and rigorous testing methods to ensure their reliability. For example, the busbar's conductive bars are typically made of high-quality copper or aluminum, which offers excellent conductivity and mechanical strength. The busbar's insulation material is carefully screened for high dielectric strength and heat resistance. Furthermore, the installation and maintenance of medium-voltage busbars require specialized personnel to ensure proper installation and operation.

[0040] Furthermore, the transformer features a star configuration on the high-voltage side and a delta configuration on the low-voltage side. This structure allows for conversion between different voltage levels, meeting the needs of high-voltage transmission and low-voltage distribution. The high-voltage star connection is typically connected to the high-voltage grid, receiving a higher voltage. Through electromagnetic induction, the transformer outputs a lower voltage at the low-voltage delta connection, meeting the operating voltage requirements of various low-voltage electrical equipment. When the high-voltage side is star-connected, the line voltage is greater than the phase voltage, while when the low-voltage side is delta-connected, the line voltage is equal to the phase voltage. This connection allows the transformer to effectively distribute and transmit electrical energy at different voltage levels. The high-voltage star connection provides a path for third-harmonic current, effectively suppressing it. Due to the nonlinear characteristics of the transformer core, third-harmonic magnetic flux is generated during operation. Without a suitable path, this third-harmonic magnetic flux can cause additional losses and heat within the transformer, reducing its efficiency and lifespan. However, the high-voltage side of the star connection can direct the third-harmonic current to the earth or other grounding system, thereby reducing the harm of third-harmonic current to the transformer. The delta connection on the low-voltage side has a strong ability to withstand unbalanced loads. In actual applications, the load is often unbalanced due to various reasons. The delta-connected transformer can balance the unbalanced current of the three-phase load through the internal circulating current, thereby ensuring that the output voltage of the transformer is relatively stable. The star connection on the high-voltage side can easily perform grounding protection. By grounding the neutral point of the star connection to provide a reference potential, a low-impedance path is provided for the ground fault current, so that the ground fault can be detected and removed in time, improving safety. For the low-voltage side delta-connected transformer, since its line voltage is equal to the phase voltage, compared with the star connection, at the same voltage level, the insulation requirements are relatively lower, which can reduce the manufacturing cost and volume of the transformer, and also improve the reliability and service life of the transformer.

[0041] When selecting a transformer, it's important to determine the transformer's input and output voltage levels. Based on the actual application scenario, determine the rated voltages of the transformer's high- and low-voltage sides to ensure the transformer can properly perform voltage conversion. Determine the transformer's capacity based on the load's power requirements. Calculate the total power of the connected loads and factor in margins to ensure the transformer is not overloaded during long-term operation. Furthermore, the transformer's capacity should match that of the power management device to avoid compromising the stability and reliability of the device due to over or under capacity. For example, for a load with a total power of 1000kW, a transformer with a capacity of 1250kVA can be selected to provide sufficient margin. Furthermore, short-circuit impedance is a critical transformer parameter, affecting the current flow and system stability during a short-circuit fault. Generally, a higher short-circuit impedance reduces the short-circuit current, but also increases the voltage drop. When selecting a transformer, it's also important to determine the appropriate short-circuit impedance based on the short-circuit capacity and protection requirements of the power management device. For example, in a power management device with a larger short-circuit capacity, a transformer with a higher short-circuit impedance can be selected to limit the short-circuit current and protect electrical equipment. Furthermore, transformer efficiency directly impacts energy utilization and operating costs. High-efficiency transformers can reduce energy loss and electricity bills. When comparing the efficiency of different transformers, it's important to refer to the manufacturer's technical specifications and efficiency curves and select products with the highest efficiency within the load range. For example, new energy-saving transformers using advanced core materials and winding designs can achieve higher efficiency. However, if a large number of nonlinear loads, such as inverters and rectifiers, are present in actual applications, harmonic currents can be generated, posing a threat to the transformer and other electrical equipment. Therefore, it's crucial to select a transformer with excellent harmonic suppression capabilities. For example, transformers with harmonic filters or specialized winding structures can be selected to minimize the impact of harmonics. For example, transformers with delta windings can effectively suppress third-order harmonic currents.

[0042] Furthermore, transformers may experience brief overloads during actual operation. Choosing a transformer with a certain overload capacity can improve operational reliability. Furthermore, the transformer's overload multiple and duration must be clearly defined to ensure it can meet load demands in an emergency. For example, a transformer that can withstand 1.5 or even 2 times its rated load for a short period of time provides a safety margin for the power management device. The appropriate protection level and cooling method should be selected based on the transformer's installation location. For indoor installations, the protection level can be relatively low, but ventilation and heat dissipation must be considered. For outdoor installations, a transformer with a higher protection level is required to prevent the intrusion of dust, moisture, and other contaminants. Furthermore, the appropriate cooling method, such as natural cooling, air cooling, or oil cooling, should be selected based on the installation space and ambient temperature. Ambient temperature significantly affects the transformer's operating performance. In high-temperature environments, heat dissipation is difficult for the transformer, which can easily lead to elevated temperatures, reducing efficiency and lifespan. Therefore, when selecting a transformer, consider the maximum ambient temperature in the area and select a product that can operate normally within that temperature. Consider also using a transformer with temperature monitoring and protection devices to ensure timely action in the event of excessive temperatures. If a transformer is installed at high altitude, the impact of altitude on electrical insulation and heat dissipation must be considered. Generally, as altitude increases, air density decreases, electrical insulation strength decreases, and heat dissipation capacity also decreases. Therefore, transformers used in high-altitude areas require special design to meet insulation and heat dissipation requirements. For example, measures such as strengthening the insulation structure and increasing the heat sink area can be adopted. Transformers must also hold relevant quality certifications, such as ISO9001 quality management system certification and CCC certification, to ensure compliance with national and industry quality standards and reliable quality.

[0043] It should be noted that the power management device in this embodiment can be a construction power management device such as a construction power management device of a nuclear power plant, or a power management device of other factories with power management needs, which is not limited here.

[0044] This embodiment also provides a power management system, which includes the power management device according to any embodiment of the present utility model, and also includes a cable tray, and the lines in the power management device are routed through the cable tray. For example, Figure 2 This is a schematic diagram of the structure of a cable tray provided by an embodiment of the present utility model. Figure 2 , structural rules of cable trays, Figure 2 The structure of the cable tray is only for schematic illustration and can be determined according to the actual device requirements and is not limited here.

[0045] Optionally, the cable trays are numbered.

[0046] Specifically, numbering cable trays facilitates coordinated management and maintenance. When cable trays are large and complex, numbering allows maintenance personnel to quickly and accurately locate specific cable tray areas when a fault occurs or inspections are required. For example, if a cable fault occurs in a certain area, the numbering allows for quick identification of the corresponding cable tray location, shortening troubleshooting time. Numbering cable trays facilitates the creation of detailed maintenance records. During maintenance work, information such as the location, time, and content of maintenance can be associated with the corresponding cable tray number, facilitating subsequent query and analysis. This provides a better understanding of the cable tray's operational status and provides a basis for developing preventive maintenance plans. Numbering allows for the classification and statistics of cable trays in different areas. Furthermore, during equipment upgrades or modifications, the numbering can be used to quickly identify the specific cable tray areas to be covered. During the construction and installation of cable trays, the numbering serves as an important reference for construction personnel, allowing them to follow the numbering sequence to ensure the correct installation of each component. For example, in the construction of large industrial plants, cable tray installation may involve multiple construction teams. Numbering clarifies the scope of work for each team, preventing duplication or omissions. Cable tray numbering also helps manage cable tray materials. Cable trays of different specifications and models can be categorized by number, making it easier to find and allocate materials. At the construction site, workers can quickly identify required cable tray materials based on the numbering, improving construction efficiency. In emergencies such as fires and earthquakes, numbering helps rescue workers quickly understand the layout and location of cable trays so they can take appropriate measures. For example, in the event of a fire, rescue workers can use the numbering to determine the distribution of cables on the cable tray, preventing further danger from burning cables. Numbering can be combined with safety signs to enhance the safety of cable tray systems. For example, prominent numbering and safety warning signs can be placed on the cable tray to serve as a safety reminder and prevent accidental contact or collisions. During the cable tray planning phase, numbering helps better organize and layout the tray. Numbering allows cables with different functions to be categorized and placed in corresponding tray areas, making the layout clearer and more logical. Numbering also reserves space for future expansion and upgrades, facilitating subsequent planning and design. When cable tray expansion or modification is needed, the numbering provides an accurate reference to determine the location of the cable tray to be added or modified, avoiding unnecessary interference with the existing structure. At the same time, the numbering can also be used to appropriately number the newly added cable trays to ensure that the entire numbering system remains consistent.

[0047] The power management system provided in this embodiment belongs to the same utility model concept as the power management device provided in any embodiment of the present invention, and has corresponding beneficial effects. For technical details not detailed in this embodiment, please refer to the power management device provided in any embodiment of the present invention.

[0048] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A power management device, characterized in that: include: At least two transformers; busbars corresponding one to one with the transformers; A plurality of switches, wherein the busbars are electrically connected to each other via switches, and the busbars are electrically connected to the corresponding transformers via switches; A multi-circuit ring network, wherein the ring network is electrically connected to the busbar through a switch, and each ring network is provided with its own distribution box, which is a multi-stage distribution box.

2. The power management device according to claim 1, wherein: The multi-level distribution box includes a level 1 distribution box, a level 2 distribution box and a level 3 distribution box which are electrically connected in sequence.

3. The power management device according to claim 2, wherein: The power management device is applied to factory buildings. The distribution of the level 1 distribution boxes is set according to the floors of the factory buildings, the distribution of the level 2 distribution boxes is set according to the rooms or areas on the floors, and the distribution of the level 3 distribution boxes is set according to the types of work in the rooms or areas.

4. The power management device according to claim 1, wherein: The at least two transformers include a first transformer and a second transformer. The busbar corresponding to the first transformer is a first busbar, the busbar corresponding to the second transformer is a second busbar, the first transformer is a working transformer, and the second transformer is a standby transformer.

5. The power management device according to claim 4, wherein: Each ring network includes two ring network switches. The ring network is electrically connected to the first busbar through one of the ring network switches and is electrically connected to the second busbar through the other ring network switch.

6. The power management device according to claim 4, wherein: The multiple switches include a first switch, a second switch, and a third switch. The first busbar is electrically connected to the first transformer through the first switch, the second busbar is electrically connected to the second transformer through the second switch, and the first busbar is electrically connected to the second busbar through the third switch.

7. The power management device according to claim 1, wherein: The high-voltage end of the transformer is electrically connected to the power grid, and the low-voltage end of the transformer is electrically connected to the corresponding busbar through a switch.

8. The power management device according to claim 1, wherein: The busbar is a medium voltage busbar.

9. A power management system, characterized in that: The power management device comprises the power management device according to any one of claims 1 to 8, and further comprises a cable tray, through which the lines in the power management device are routed.

10. The power management system according to claim 9, characterized in that: The cable trays are numbered.

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