Temporary power supply device, power supply device and power supply method
By designing a temporary power supply device, the problem of unstable power supply for emergency lighting in the nuclear island during the overhaul of the high-temperature gas-cooled reactor was solved, enabling rapid switching and stable output, meeting the needs of efficient maintenance, and reducing costs and operational complexity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-15
- Publication Date
- 2026-03-13
AI Technical Summary
During the overhaul of the high-temperature gas-cooled reactor, the emergency lighting power supply system of the nuclear island suffers from problems such as unstable power supply, complicated operation, high cost, and poor adaptability. In particular, when the lighting system distribution panel is being repaired, the emergency diesel generator cannot be connected, causing the lighting system to malfunction and affecting safety and the repair progress.
A temporary power supply device was designed, including a temporary power supply, an input switch, and a main/backup power transfer switch. It operates independently from the main power supply through physical isolation design, and has the functions of rapid switching and stable output, which can meet the short-term and efficient operation requirements during the overhaul of high-temperature gas-cooled reactors.
It achieves continuous and reliable power supply for emergency lighting in the nuclear island, avoids interference with the formal power supply system, simplifies the operation process, reduces initial investment and subsequent maintenance costs, and meets the economic and practical requirements of high-temperature gas-cooled reactor overhaul.
Smart Images
Figure CN121663770A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of high-temperature gas-cooled reactor technology, specifically to temporary power supply devices, power supply devices, and power supply methods. Background Technology
[0002] As a core facility for clean energy supply, the safe and stable operation of nuclear power plants depends on periodic overhauls. This work is like a "comprehensive physical examination and diagnosis" of the equipment, covering key aspects such as preventive maintenance, corrective maintenance, periodic testing, in-service inspections, and equipment modification and replacement. It requires systematic maintenance of the primary loop centered on the nuclear reactor, the secondary loop centered on the turbine generator, and the tertiary loop centered on the cold source. It also involves the maintenance of all equipment in the nuclear power plant. The electrical professionals need to take advantage of the "power outage window" during the overhaul to carry out comprehensive pre-maintenance of equipment that cannot be shut down on a daily basis, ensuring long-term reliable operation.
[0003] Among them, the high-temperature gas-cooled reactor, as the first model of advanced nuclear power technology, faces unique challenges in its first major overhaul: during the overhaul period, a large number of equipment inspections, maintenance, periodic tests, and modifications need to be completed in a short period of time, resulting in the concentrated shutdown of multiple systems and equipment in the power plant, and the simultaneous power outage of supporting power sources. As a critical load for ensuring the safety of maintenance personnel and maintaining the continuity of maintenance work, the power supply stability of the nuclear island emergency lighting directly determines the pace of the overhaul. If the lighting system fails, it will not only force the maintenance work to be interrupted, but may also cause safety risks due to obstructed vision, seriously restricting the maintenance progress of other specialties.
[0004] Currently, the power distribution design of high-temperature gas-cooled reactors (HTGRs) mainly focuses on meeting the routine power needs of various systems, with a significant lack of consideration for backup power requirements during user power outages and maintenance scenarios. This is particularly evident in the power supply guarantee for emergency lighting systems: although the existing design configures the lighting system with a dual power supply logic of "normal power supply + emergency diesel generator," the emergency diesel generator cannot be connected to the distribution circuit when the corresponding switchboard of the lighting system needs to be repaired during overhauls, resulting in a complete paralysis of the lighting system. At the same time, the existing temporary power supply schemes have significant defects: some schemes adopt a connection method associated with the permanent power supply, which can easily interfere with the stability of the permanent power supply system and pose a risk to the power supply of nuclear safety equipment; the temporary power cable connection and dismantling process of some schemes is complicated, requiring a lot of manpower and time, which is difficult to adapt to the "short time, high efficiency" operation requirements during overhauls; and some schemes lack reusability, requiring redeployment for each overhaul, resulting in high initial investment and subsequent maintenance costs, and high difficulty in daily maintenance, failing to meet the economic and practical requirements of HTGR overhauls. Summary of the Invention
[0005] This invention provides a temporary power supply device, a power supply device, and a power supply method to solve the problem of how to ensure a continuous and reliable supply of emergency lighting for the nuclear island during a high-temperature gas-cooled reactor overhaul.
[0006] In a first aspect, the present invention provides a temporary power supply device for use during the maintenance of a high-temperature gas-cooled reactor. The device includes: a temporary power supply, an input switch, and a main / standby power supply conversion switch. The first end of the temporary power supply is connected to the standby power supply, and the second end of the temporary power supply is connected to the first end of the input switch. The second end of the input switch is connected to the standby power supply position of the main / standby power supply conversion switch. The main power supply position of the main / standby power supply conversion switch is connected to the main power supply, and the output end of the main / standby power supply conversion switch is used to output the standby power supply.
[0007] This invention combines the current power supply characteristics of high-temperature reactors to reduce the workload of providing temporary power for emergency lighting in the nuclear island during major overhauls. Furthermore, the equipment is simple to maintain and repair, and the initial investment and subsequent maintenance costs are both low. It has been implemented in high-temperature reactors with good results.
[0008] In one alternative implementation, the temporary power supply includes a transformer, wherein a first side of the transformer is connected to a backup power supply and a second side of the transformer is connected to an input switch.
[0009] In one optional embodiment, the temporary power supply includes: a transformer substation distribution box and a power supply side plug, wherein a transformer is placed inside the transformer substation distribution box; the power supply side plug is disposed on the outer shell of the transformer substation distribution box and is connected to the second side of the transformer and the input switch.
[0010] In one optional embodiment, the temporary power supply device further includes: a temporary power connection box, a power-side male plug, and a load-side male plug, wherein an input switch is placed inside the temporary power connection box; the power-side male plug and the load-side male plug are disposed on the outer shell of the temporary power connection box; the power-side male plug is used to connect with the power-side female plug; and the load-side male plug is used to connect with the backup power position of the main / backup power transfer switch.
[0011] In one alternative implementation, the main / backup power transfer switch and the main power supply are both placed in the same distribution cabinet.
[0012] In one optional embodiment, the temporary power supply device further includes a load-side female plug, wherein the load-side female plug is disposed on the outer shell of the distribution cabinet, and the load-side female plug is used to connect to the standby power position of the main standby power transfer switch.
[0013] In a second aspect, the present invention provides a power supply device, comprising: a temporary power supply device according to the first aspect and any optional embodiment thereof, and a formal power supply.
[0014] In one optional implementation, the main power supply includes a power switch, wherein a first terminal of the power switch is connected to the main power supply, and a second terminal of the power switch is connected to the main power switch position of the main / standby power transfer switch.
[0015] In one alternative implementation, the main power supply further includes a busbar, wherein a first terminal of a power switch is connected to the busbar, and the busbar is connected to the main power supply.
[0016] Thirdly, the present invention provides a power supply method, a power supply device according to the second aspect and any optional embodiment thereof, the method comprising: during maintenance of a high-temperature gas-cooled reactor, controlling the output terminal of a main / standby power supply switching switch to connect to its standby power supply position; and closing an input switch. Attached Figure Description
[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0018] Figure 1 This is a diagram illustrating the composition of a temporary power supply device according to an embodiment of the present invention; Figure 2 This is a composition diagram of a power supply device according to an embodiment of the present invention. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0020] It is understood that before using the technical solutions disclosed in the various embodiments of the present invention, users should be informed of the types, scope of use, and usage scenarios of the personal information involved in the present invention and their authorization should be obtained in accordance with relevant laws and regulations through appropriate means.
[0021] This embodiment provides a temporary power supply device to address the problem of power outages for emergency lighting in the nuclear island during high-temperature gas-cooled reactor (HTGR) overhauls. Designed with safety isolation, rapid switching, and stable output as core principles, this device can operate completely independently of the nuclear island's formal power supply system, avoiding interference with the power supply stability of nuclear safety equipment. It also meets the practical requirements of short-term deployment and high-efficiency operation during overhauls, and is specifically designed for HTGR nuclear island maintenance scenarios, providing continuous and reliable backup power support for emergency lighting loads. Its structural connection relationship is as follows: Figure 1 (Diagram of device structure) The device includes: a temporary power supply 1, an input switch 2, and a main / backup power conversion switch 3. The first end of the temporary power supply 1 is connected to the backup power supply, and the second end of the temporary power supply 1 is connected to the first end of the input switch 2; the second end of the input switch 2 is connected to the backup power position of the main / backup power conversion switch 3; the main power position of the main / backup power conversion switch 3 is connected to the main power supply 4, and the output end of the main / backup power conversion switch 3 is used to output the backup power supply.
[0022] Specifically, temporary power supply 1 serves as the core energy input for the entire temporary power supply unit. Its core function is to obtain electrical energy from the outside, independent of the nuclear island's formal power supply network, and convert it into a power supply form suitable for the nuclear island's emergency lighting load. The backup power supply connected to temporary power supply 1 has no electrical connection with the nuclear island's formal power supply system (such as plant working power supply and emergency diesel generator power supply). Through physical isolation design, mutual interference between the temporary power supply circuit and the formal circuit is completely eliminated, meeting the requirements of nuclear safety for the independence of critical load power supply.
[0023] Specifically, temporary power supply 1 needs to be located in a designated area outside the nuclear island plant. This area should be far away from the influence of nuclear radiation, and at the same time, it should facilitate subsequent cable laying and daily inspection and maintenance to avoid the impact of environmental factors on the stable operation of the power supply.
[0024] Specifically, the temporary power supply 1 has two clearly defined connection ends: the first end is specifically used to connect to an external backup power supply, and the connection method must be adapted to the output form of the backup power supply to ensure the stability and safety of the power input; the second end is used to establish a connection with the input switch 2, and the power is transferred to the subsequent circuit through the adapted connection structure. The connection part must meet the durability and convenience requirements in the maintenance scenario, so as to facilitate disassembly and maintenance in the future.
[0025] Specifically, input switch 2 is the core of control and protection in the temporary power supply circuit. Its main functions include two aspects: first, as a control component for the on / off of the temporary circuit, it can flexibly open or close the power supply from temporary power supply 1 to subsequent circuits according to maintenance needs; second, it has fault protection capabilities. When the temporary circuit experiences abnormal conditions such as overload or short circuit, it can quickly disconnect the circuit to prevent the fault from expanding and causing damage to temporary power supply 1 or lighting load, thus ensuring the safe operation of the entire temporary power supply system.
[0026] Specifically, input switch 2 is not set up independently, but is integrated into a special protective structure. This protective structure must have protective performance that can adapt to the nuclear island maintenance environment, and at the same time, it must be clearly marked with operation labels and warning information, and only authorized maintenance personnel are allowed to operate it to prevent unauthorized misoperation from causing safety risks.
[0027] Specifically, the two ends of the input switch 2 correspond to specific functional interfaces: the first end is connected to the second end of the temporary power supply 1 to ensure that electrical energy can be stably transmitted to the switch; the second end is adapted to the backup power position of the main backup power conversion switch 3, and the connection method must meet the requirements of quick docking and convenient disassembly to adapt to the pace of rapid deployment and dismantling of the temporary power supply system during major overhaul.
[0028] The main / backup power transfer switch 3 is a key component for switching between the primary power supply 4 and the backup power supply. Its core function is to flexibly switch the power source for the nuclear island emergency lighting load between the primary power supply 4 and the temporary power supply 1 according to the maintenance requirements. The switching process must ensure the continuity of power supply to the lighting load to avoid prolonged power outages affecting the safety and progress of maintenance work. In terms of installation location, the main / backup power transfer switch 3 should be installed inside the power distribution structure upstream of the nuclear island emergency lighting load, between the control components of the primary power supply 4 and the lighting load. This allows maintenance personnel to operate it directly from a safe area without entering areas with nuclear radiation risks.
[0029] In terms of position and connection logic, the function of the transfer switch is clearly divided: one is the main power supply position, which is specifically connected to the nuclear island's main power supply 4 and is used to supply formal power to the lighting load under normal operating conditions; the other is the backup power supply position, which is adapted to the second terminal of the input switch 2 and is used to connect to the temporary power supply 1 during overhaul; at the same time, the transfer switch has a dedicated output terminal, which is directly connected to the power supply circuit of the nuclear island's emergency lighting load. No matter which position it is switched to, the power of the corresponding power supply can be stably delivered to the lighting load, ensuring that the power supply interruption time of the lighting load during the switching process is controlled within a very small range, meeting the requirements of power supply continuity for overhaul operations.
[0030] In summary, the temporary power supply device in this embodiment forms a complete temporary power supply solution through hierarchical functional coordination and logical connection of temporary power supply 1, input switch 2, and main / backup power supply conversion switch 3. It achieves complete independence from the main power supply 4 through physical isolation design, avoiding power supply interference to nuclear safety equipment. Furthermore, its convenient connection and switching design improves the deployment and operation efficiency of the temporary power supply system during overhauls. Finally, the functional protection design of each component ensures the safety and stability of the power supply process, effectively solving the pain points of existing technologies such as temporary power supply interference with the main system, complex operation, and poor adaptability. This provides reliable power supply for nuclear island emergency lighting during high-temperature gas-cooled reactor overhauls.
[0031] In one alternative implementation, such as Figure 2 As shown, the temporary power supply 1 includes a transformer T, wherein the first side of the transformer T is connected to the backup power supply, and the second side of the transformer T is connected to the input switch 2.
[0032] In the configuration of temporary power supply 1, transformer T is not a conventional general-purpose power conversion component, but a core power adaptation and safety isolation component designed for the overhaul scenario of high-temperature gas-cooled reactor nuclear island. Its core function is to realize the power parameter adaptation between the external backup power supply and the emergency lighting load of the nuclear island. At the same time, through electrical isolation characteristics, it blocks the transmission of possible interference or faults on the backup power supply side to the lighting load side, thus ensuring the safety and stability of the temporary power supply circuit from a structural perspective, laying the foundation for the reliable operation of subsequent input switch 2 and main / backup power conversion switch 3.
[0033] In one alternative implementation, such as Figure 2 As shown, the temporary power supply 1 includes: a transformer substation distribution box 11 and a power supply side plug 12, wherein the transformer substation distribution box 11 houses the transformer T; the power supply side plug 12 is installed on the outer shell of the transformer substation distribution box 11 and is connected to the second side of the transformer T and the input switch 2.
[0034] Specifically, the transformer substation 11 is the physical shell and functional integration core of the temporary power supply 1. Its core objective is to provide safe protection, environmental adaptability, and easy maintenance operating conditions for the transformer T placed inside, while realizing the orderly integration of various components of the temporary power supply 1 to avoid wiring confusion or safety risks caused by scattered layout.
[0035] Specifically, the primary function of the transformer substation 11 is environmental protection: considering that the temporary power supply 1 needs to be installed outside the nuclear island plant (away from the nuclear radiation area), the enclosure must have protective performance to adapt to outdoor and maintenance environments, resisting external influences such as rain, dust, and short-term impacts (such as collisions with maintenance tools), while isolating the interference of ambient temperature fluctuations on the operation of transformer T, ensuring that transformer T maintains stable power conversion efficiency throughout the entire overhaul cycle (usually several weeks to several months), and avoiding failures caused by environmental factors. Secondly, the enclosure undertakes the function of component integration and wiring standardization: the internal space layout needs to reserve reasonable installation positions according to the size of transformer T, and at the same time reserve a dedicated wiring channel for the connection line between transformer T and the power supply side plug female 12. The channel adopts an insulated separation design to prevent mutual friction or interference between lines and reduce the risk of short circuits; the interior of the enclosure also needs to be equipped with a simple maintenance window or a removable panel, so that maintenance personnel can check the wiring status and operating temperature of transformer T without disassembling the entire enclosure, adapting to the needs of rapid troubleshooting and timely maintenance during overhauls.
[0036] In addition, the safety design of the transformer substation distribution box 11 must comply with the operating specifications of nuclear power plants: the outer shell of the box must be clearly marked with warning signs for temporary power supply equipment, and unauthorized personnel are strictly prohibited from touching it; the box door is equipped with a mechanical lock, and only authorized maintenance personnel are allowed to hold the key to prevent power outages or electric shock risks caused by misoperation; cable entry and exit holes are reserved at the bottom or side of the box, and the holes are equipped with seals to seal the gaps after the cables pass through, further enhancing the dustproof and waterproof effect and preventing external impurities from entering the box and affecting the operation of the components.
[0037] The female plug 12 on the power side is the bridge interface between the temporary power supply 1 and the input switch 2. Its core design features convenient connection, safety against misoperation, and stable conductivity. By optimizing the interface structure and installation position, the deployment and dismantling time of the temporary power supply system during major overhauls is greatly shortened, while eliminating the risk of misoperation during the connection process.
[0038] Specifically, the power supply side plug female 12 needs to be fixedly installed on the outer shell of the transformer substation distribution box 11, and the installation position needs to meet the principles of easy operation and non-interference. It is usually selected in a conspicuous position on the side or front of the box, and the height is suitable for the comfort range of maintenance personnel standing and operating, so that the connection with the input switch 2 can be completed without bending over or climbing. At the same time, the installation position should avoid key parts such as heat dissipation holes and cable inlet and outlet holes of the box to avoid touching other parts during the connection operation and ensure operational safety.
[0039] Specifically, the two ends of the power supply side plug female 12 serve the dual functions of internally connecting to the transformer T and externally connecting to the input switch 2: one end is fixedly connected to the second side (power output end) of the transformer T through a dedicated cable inside the transformer substation distribution box 11. The connection part is insulated to ensure that there is no risk of leakage during the transmission of power from the transformer T to the plug female, and that the conductive contact is tight to avoid voltage loss or heat generation due to poor contact; the other end is exposed outside the box as an interface for docking with the input switch 2. Its interface shape must be fully compatible with the corresponding plug (male) of the input switch 2 and have a design to prevent mis-plugging. For example, through the uniqueness of the interface shape and pin arrangement, it is ensured that it can only dock with the matching input switch 2 plug to prevent circuit failure caused by misconnection to other equipment.
[0040] In addition, the external interface should be equipped with a removable dust cover. When the input switch 2 is not connected, the dust cover can effectively prevent dust and rainwater from entering the interface, protect the cleanliness of the conductive parts of the interface, and avoid contact failure caused by impurities during connection.
[0041] The design of the transformer substation distribution box 11 and the power supply side plug / female connector 12 forms a deep synergy: the transformer substation distribution box 11 provides a stable operating environment and safety protection for the transformer T, ensuring that the core components of power conversion are not affected by external interference; the power supply side plug / female connector 12, based on the structural layout of the box, enables rapid connection between the temporary power supply 1 and the subsequent input switch 2, avoiding deployment delays caused by complex wiring. This synergistic design not only meets the core requirements of rapid deployment and safe isolation of temporary power supply during high-temperature gas-cooled reactor overhauls, but also reduces the maintenance difficulty of the temporary power supply 1 through a structured integrated design. For example, maintenance personnel can check the status of the transformer T through the maintenance window of the box and determine whether the connection is ready by checking the dust cover status of the external plug / female connector. Basic maintenance can be completed without disassembling the entire device, further adapting to the pace of efficient operation during overhauls.
[0042] In summary, the combination of the transformer substation 11 and the power supply side plug 12, through integrated protection and convenient connection design, not only improves the structural integrity of the temporary power supply 1, but also addresses the three core pain points of environmental adaptability, safe operation, and rapid deployment, specifically for the overhaul of the high-temperature gas-cooled reactor nuclear island. It provides reliable protection for the power transmission between the transformer T and the input switch 2, becoming an indispensable component of the temporary power supply system.
[0043] In one alternative implementation, such as Figure 2As shown, the temporary power supply device also includes: a temporary power connection box 5, a power-side male plug 6, and a load-side male plug 7. The input switch 2 is placed inside the temporary power connection box 5. The power-side male plug 6 and the load-side male plug 7 are mounted on the outer shell of the temporary power connection box 5. The power-side male plug 6 is used to connect with the power-side female plug 12. The load-side male plug 7 is used to connect with the backup power position of the main / backup power conversion switch 3.
[0044] Specifically, the temporary power supply junction box 5 provides protection and an operational foundation for the input switch 2, ensuring that the switch can safely and stably achieve circuit control; the power supply side plug 6, relying on the layout of the junction box, quickly connects to the temporary power supply 1 (substation distribution box 11) to obtain power input; the load side plug 7, also using the junction box as a carrier, transmits the power controlled by the input switch 2 to the main / backup power transfer switch 3, and finally connects to the emergency lighting load. This collaborative design simplifies the construction process of the temporary power supply circuit to three steps: Insert the male plug 6 of the power supply side into the female plug 12 of the power supply side on the transformer substation distribution box 11, insert the male plug 7 of the load side into the standby power position of the main / standby power transfer switch 3, and close the input switch 2. The whole process does not require complicated wiring and can be completed by a single person in a short time, which greatly improves the deployment efficiency of temporary power supply during major overhauls. At the same time, the safety design of the three (such as anti-misinsertion, insulation isolation, and authorized operation) forms multiple protections, completely eliminating electrical risks and potential misoperation hazards during the connection process, and ensuring the safety and stability of the temporary power supply circuit.
[0045] In one optional implementation, the main / standby power transfer switch 3 and the main power supply 4 are both placed in the same distribution cabinet 8.
[0046] Integrating the main / standby power transfer switch 3 and the primary power supply 4 into the same distribution cabinet 8 essentially addresses the power supply challenges during high-temperature gas-cooled reactor overhauls through centralized space management, integrated operation, and standardized isolation. Improved operational efficiency: During overhauls, switching power does not require operation across multiple distribution cabinets 8. Maintenance personnel only need to disconnect the switch of the main power supply 4 and switch the main / standby power transfer switch 3 to the standby power position within the same cabinet to complete the power supply switchover. The entire process can be completed in a short time, much faster than cross-cabinet operations, which is in line with the pace of short-term deployment during overhauls. Safety risks are reduced: the wiring chaos caused by cross-cabinet wiring is avoided. The wiring of the main power supply 4 and the main and backup power conversion switch 3 are fixed and isolated inside the cabinet, with no exposed external cables, reducing the risk of electric shock or short circuit caused by cable wear and accidental contact. At the same time, the mechanical interlocking device further eliminates the nuclear safety hazards of dual power supply in parallel. Improved ease of maintenance: During the overhaul, when inspecting the four main power supply components, the transfer switch and wiring interface of the temporary power supply circuit are all in the same cabinet. Maintenance personnel can intuitively confirm the connection status of temporary power supply 1 without having to travel between multiple devices to check the operating conditions, thus reducing the probability of misjudgment during maintenance. Space utilization optimization: The nuclear island plant has limited space. Integrated cabinets avoid the space waste caused by setting up separate transfer switch cabinets and main power cabinets. At the same time, it simplifies the cable wiring in the plant and reduces the overall complexity of the power distribution system.
[0047] In summary, the design of placing the main and backup power transfer switch 3 and the main power supply 4 in the same distribution cabinet 8 is a customized integrated solution for emergency lighting power supply scenarios in the high-temperature gas-cooled reactor nuclear island. It not only achieves physical concentration of components, but also integrates the two major requirements of stable power supply and overhaul adaptation through in-depth design of environmental adaptation, safety isolation and operation coordination. It becomes a key hub for the connection between the temporary power supply device and the original power supply system of the nuclear island, and provides a structural foundation for reliable power supply for emergency lighting during the overhaul of the high-temperature gas-cooled reactor.
[0048] In one alternative implementation, such as Figure 2 As shown, the temporary power supply device also includes a load-side plug female 9, wherein the load-side plug female 9 is installed on the outer shell of the distribution cabinet 8, and the load-side plug female 9 is used to connect to the standby power position of the main standby power transfer switch 3.
[0049] In the connection between the temporary power supply unit and the original power distribution system of the nuclear island, the load-side plug female 9 is not a simple interface component, but a special connection hub designed for the overhaul scenario of high-temperature gas-cooled reactors. Its core function is to build a temporary power supply 1 access channel on the outer shell of the distribution cabinet 8. One end connects to the backup power position of the main / backup power conversion switch 3 inside the cabinet, and the other end provides a precise docking interface for the load-side plug male 7 of the external temporary power connection box 5. Through structural design, it achieves the requirements of safe anti-misoperation, rapid docking, and stable conductivity, while adapting to the environmental characteristics and operating specifications of the nuclear island distribution cabinet 8. This embodiment provides a power supply device, including: the above-mentioned temporary power supply device and the main power supply 4.
[0050] Specifically, during normal operation, the main power supply 4 assumes the core power supply responsibility, ensuring the stable operation of emergency lighting 24 hours a day and meeting the safety lighting needs under normal nuclear island operating conditions. During overhaul, when the distribution panel corresponding to the main power supply 4 needs maintenance and cannot supply power, the temporary power supply device quickly intervenes and takes over the power supply through a preset switching mechanism, ensuring that the lighting is not interrupted during maintenance work and avoiding safety risks or delays in the overhaul progress due to obstructed vision.
[0051] In one alternative implementation, such as Figure 2As shown, the main power supply 4 includes a power switch 10, wherein the first end of the power switch 10 is connected to the main power supply, and the second end of the power switch 10 is connected to the main power supply position of the main / standby power supply conversion switch 3.
[0052] In the configuration of the main power supply 4, the power switch 10 is not a typical on / off component in civilian or industrial scenarios, but a nuclear-grade power supply control and protection hub designed for the high reliability and high safety requirements of emergency lighting in the high-temperature gas-cooled reactor nuclear island. Its core function is to control the on / off state of the main power supply circuit. It must ensure the continuous and stable power supply for emergency lighting during daily operation, and provide a safe operating node for the shutdown and maintenance of the main power supply 4 and the switching of the temporary power supply 1 during major overhauls. At the same time, it resists the risk of circuit abnormalities through built-in protection functions. It is a key connecting component between the main power supply 4 and the main / backup power transfer switch 3. Its functional design, connection logic and scenario adaptation are all deeply compatible with the special operation and maintenance needs of the nuclear island.
[0053] In one alternative implementation, such as Figure 2 As shown, the main power supply 4 also includes a bus 11, wherein the first end of the power switch 10 is connected to the bus, and the bus is connected to the main power supply.
[0054] In the architecture of the main power supply 4, bus 11 is not a simple power transmission conductor, but a core power hub designed for the high redundancy, high stability and high safety power supply requirements of emergency lighting in the high-temperature gas-cooled reactor nuclear island. Its core function is to realize the dual functions of main power supply power collection and precise distribution to power switch 10. It must not only receive power from the high-reliability main power network of the nuclear power plant, but also provide stable and low-loss power input to power switch 10. At the same time, through structural design, it ensures power supply redundancy and fault isolation, becoming an indispensable bridge component between the main power supply and power switch 10. Its selection, connection logic and scenario adaptation are all deeply in line with the special operation and maintenance requirements of the nuclear island.
[0055] This embodiment provides a power supply method based on the above power supply device. The method includes: during the maintenance of the high-temperature gas-cooled reactor, controlling the output terminal of the main / standby power conversion switch 3 to connect to its standby power supply position; and closing the input switch 2.
[0056] Specifically, the coordination between the temporary power supply unit and the main power supply 4 is the core value of the entire power supply system. Its operation logic revolves around the two major goals of uninterrupted power supply and zero safety risks, and is divided into three key stages: 1. Routine operation phase: Main power supply 4 is in operation, temporary equipment is on standby. Under normal operating conditions, the main / standby power transfer switch 3 is switched to the main power position, the power switch 10 is closed, and electrical energy is transmitted from the plant working bus 11 through the power switch 10 and the transfer switch to the emergency lighting load. The temporary power supply device is in standby mode. Although the temporary power supply 1 (box-mounted transformer) is connected to the standby power supply, the input switch 2 remains open. The male plug of the temporary power supply junction box 5 is not connected to the female plug 9 on the load side of the distribution cabinet 8 to avoid electrical connection between the temporary circuit and the formal circuit. At the same time, the protection device in the distribution cabinet 8 monitors the status of the formal power circuit in real time. If voltage fluctuations, overloads or other abnormalities occur, the protection device will act immediately to ensure the safety of the lighting load and the formal power system.
[0057] 2. Overhaul switchover phase: Temporary equipment in place, main power supply 4 undergoes maintenance. When overhauling the distribution panel of main power supply 4, the operating procedure must strictly follow the principle of disconnecting before reconnecting and ensuring safe isolation: The maintenance personnel first disconnected the power switch 10 in the distribution cabinet 8, cutting off the power supply from the main power supply 4 to the lighting load. At this time, the emergency lighting lost power for a short period of time. After confirming that the power switch 10 is off, operate the main power switch 3 to switch from the main power position to the backup power position. The mechanical interlock device of the switch will lock the main power position simultaneously to prevent accidental switching. Connect the male plug 6 of the power supply side of the temporary power connection box 5 to the female plug 12 of the power supply side of the power distribution box 11, and connect the male plug 7 of the load side to the female plug 9 of the load side of the distribution cabinet 8 to complete the physical connection of the temporary circuit. When the input switch 2 inside the temporary power supply junction box 5 is closed, the electrical energy of the temporary power supply 1 is transmitted to the emergency lighting load through the input switch 2 and the transfer switch, and the lighting is restored. At this time, the distribution panel of the formal power supply 4 is in a de-energized state, and maintenance personnel can safely carry out maintenance work.
[0058] 3. Overhaul and recovery phase: Reset the main power supply 4, and recover the temporary equipment. After the overhaul is completed, the power supply responsibility will be transferred from the temporary unit back to the permanent power supply unit 4, and the operation procedure will be executed in reverse: Disconnect the input switch 2 of the temporary power supply junction box 5 to cut off the temporary power supply circuit; Disconnect the two male plugs from the temporary power junction box 5 to complete the temporary circuit disassembly; Operate the main / standby power conversion switch 3 to switch from the standby power position back to the main power position, and the mechanical interlock device will unlock the main power position; Close power switch 10, and the main power supply 4 resumes power supply to emergency lighting. The temporary power supply device is retrieved (the junction box is put into storage, and the transformer is switched to standby mode).
[0059] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.
Claims
1. A temporary power supply device, characterized in that, The temporary power supply device is used during the maintenance of the high-temperature gas-cooled reactor. The device includes: a temporary power supply, an input switch, and a main / backup power supply transfer switch. The first end of the temporary power supply is connected to the backup power supply, and the second end of the temporary power supply is connected to the first end of the input switch. The second end of the input switch is connected to the backup power position of the main / backup power conversion switch; The main power switch of the main power transfer switch is connected to the main power supply, and the output terminal of the main power transfer switch is used to output the backup power supply.
2. The temporary power supply device according to claim 1, characterized in that, The temporary power supply includes: a transformer, wherein, The first side of the transformer is connected to the backup power supply, and the second side of the transformer is connected to the input switch.
3. The temporary power supply device according to claim 2, characterized in that, The temporary power supply includes: a transformer substation distribution box and a power supply side plug / female connector, wherein... The transformer is placed inside the transformer substation distribution box; The power supply side plug is located on the outer shell of the transformer substation, and the power supply side plug is connected to the second side of the transformer and the input switch.
4. The temporary power supply device according to claim 3, characterized in that, Also includes: Temporary power supply junction box, power supply side male plug, load side male plug, among which... The input switch is placed inside the temporary power supply junction box; The power supply side plug male and the load side plug male are mounted on the outer shell of the temporary power connection box; The male connector of the power supply side plug is used to connect to the female connector of the power supply side plug. The male connector on the load side is used to connect to the backup power position of the main / backup power transfer switch.
5. The temporary power supply device according to claim 4, characterized in that, The main / standby power transfer switch and the main power supply are both located in the same distribution cabinet.
6. The temporary power supply device according to claim 5, characterized in that, Also includes: Load-side female connector, wherein... The load-side female plug is located on the outer shell of the distribution cabinet, and is used to connect to the backup power position of the main / backup power transfer switch.
7. A power supply device, characterized in that, include: The temporary power supply device and the formal power supply as described in any one of claims 1-6.
8. The power supply device according to claim 7, characterized in that, The power supply includes: a power switch, wherein, The first end of the power switch is connected to the main power supply, and the second end of the power switch is connected to the main power switch position of the main / standby power transfer switch.
9. The power supply device according to claim 8, characterized in that, The formal power supply also includes: a busbar, wherein... The first end of the power switch is connected to the bus, and the bus is connected to the main power supply.
10. A power supply method, characterized in that, Based on the power supply device according to any one of claims 7-9, the method includes: During the maintenance of the high-temperature gas-cooled reactor, the output terminal of the main and backup power switch is connected to its backup power position. Close the input switch.