Maintenance method and system for distribution board of nuclear power unit, and control equipment

Abstract

The invention relates to a nuclear power unit switchboard maintenance method and system and control equipment, and the method comprises the steps: determining one column of switchboards as a main maintenance column, and determining one column of switchboards in the other two columns as a secondary maintenance column; the main switchboard of the secondary maintenance column is controlled to be connected with the cross power supply sub-board of the main maintenance column, and then the main switchboard of the main maintenance column is controlled to be disconnected with the cross power supply sub-board; after the main switchboard of the main maintenance column is disconnected with the cross power supply sub-board, the predetermined equipment in the main maintenance column and the cross power supply sub-board of the secondary maintenance column are maintained; wherein the predetermined equipment does not comprise a cross power supply sub-panel. According to the invention, the situation of transient power loss of the cross power supply disc in the maintenance process of the power supply system can be avoided, thereby improving the safety of the nuclear power plant.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power unit maintenance, and in particular to a nuclear power unit switchboard maintenance method and system, and control equipment. Background Art

[0002] In the related art, during the maintenance of the power supply system of a nuclear power plant, it is necessary to switch the main transformer and the auxiliary transformer. During the switching period, the cross-power supply panel of the power supply system under maintenance will suffer a temporary power outage, which will then cause the load of the cross-power supply panel to suffer a temporary power outage, which is not conducive to the safety of the nuclear power plant. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a nuclear power unit switchboard maintenance method and system, and control equipment in order to improve the safety of the power supply system maintenance process.

[0004] The technical solution adopted by the present invention to solve the technical problem is to construct a nuclear power unit switchboard maintenance method, wherein the nuclear power unit includes three columns of switches, and the nuclear power unit switchboard maintenance method includes:

[0005] One of the columns of disks is designated as the primary maintenance column, and one of the other two columns of disks is designated as the secondary maintenance column;

[0006] Controlling the main switchboard of the secondary maintenance train to be connected to the cross power supply sub-panel of the main maintenance train, and then controlling the main switchboard of the main maintenance train to be disconnected from the cross power supply sub-panel;

[0007] After the main distribution board of the main maintenance train is disconnected from the cross power supply sub-board, the predetermined equipment in the main maintenance train and the cross power supply sub-board of the secondary maintenance train are inspected; wherein, the predetermined equipment does not include the cross power supply sub-board.

[0008] Preferably, the maintenance of predetermined equipment in the primary maintenance train and the cross-power supply sub-panel of the secondary maintenance train includes:

[0009] The main switchboard of the main maintenance train is inspected and repaired. In the main switchboard inspection area, the uninterruptible power supply system, emergency power distribution system and voltage-stabilized power supply system of the main maintenance train and the cross-power supply sub-panel of the secondary maintenance train are also inspected and repaired;

[0010] After the uninterruptible power supply system, emergency power distribution system and voltage-stabilized power supply system of the main maintenance train are overhauled, the inverter and battery charger of the main maintenance train are overhauled.

[0011] Preferably, the inverter and battery charger of the main maintenance train are overhauled, including:

[0012] The emergency power distribution system of the secondary maintenance train is used to replace the emergency power distribution system of the main maintenance train to supply power to the voltage-stabilized power supply system of the main maintenance train, and the battery of the main maintenance train is used to supply power to the DC power supply system thereof, so as to supply power to the inverter of the main maintenance train, so as to perform a power-on test on the inverter of the main maintenance train;

[0013] After the inverter completes the test, power is supplied to the battery charger of the main maintenance column to perform a power-on test on the battery charger of the main maintenance column.

[0014] Preferably, during the power-on test of the battery charger of the main maintenance train, the batteries of the main maintenance train are also charged.

[0015] Preferably, the nuclear power unit switchboard maintenance method further includes:

[0016] After completing the test on the battery charger, supply power to the DC power system of the main maintenance train to preheat the diesel engine of the nuclear power unit;

[0017] After the diesel engine is preheated, perform the diesel engine start test.

[0018] Preferably, before performing the diesel engine starting test, it is determined whether the batteries of the main maintenance train are charged and restored to a normal state. If so, the diesel engine starting test is allowed; otherwise, the diesel engine starting test is prohibited.

[0019] Preferably, the nuclear power unit switchboard maintenance method further includes:

[0020] After all tests are completed, the main maintenance train and the secondary maintenance train are restored to normal conditions.

[0021] Preferably, the nuclear power unit switchboard maintenance method further includes:

[0022] After the main maintenance train is tested, the untested train is determined as a new main maintenance train, and a corresponding new secondary maintenance train is determined, and then corresponding testing steps are performed on the new main maintenance train and the secondary maintenance train.

[0023] In addition, the present invention also constructs a control device, including a memory, a processor, and a computer program stored in the memory and runnable on the processor. When the processor executes the computer program, the steps of the above-mentioned nuclear power unit distribution board maintenance method are implemented.

[0024] In addition, the present invention also constructs a nuclear power unit switchboard maintenance system, including the control device described above.

[0025] The implementation of the present invention has the following beneficial effects: the present invention can avoid the situation where the cross power supply panel temporarily loses power during the maintenance process of the power supply system, thereby improving the safety of the nuclear power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0027] Figure 1 is a flowchart of a method for repairing a nuclear power plant switchboard in some embodiments of the present invention;

[0028] Figure 2 is a circuit diagram of each column disk in some embodiments of the present invention;

[0029] Figure 3 is a flowchart of a method for repairing a nuclear power unit switchboard in other embodiments of the present invention;

[0030] Figure 4 It is a circuit structure block diagram of a nuclear power unit switchboard maintenance system in some embodiments of the present invention. DETAILED DESCRIPTION

[0031] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0032] It should be noted that the flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all content and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, while others may be combined or partially combined. Therefore, the actual execution order may vary depending on the actual situation.

[0033] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0034] Figure 1 The flowchart is a program flow diagram of a nuclear power plant switchboard maintenance method according to some embodiments of the present invention. This method is applicable to nuclear power plants that include three power supply trains, each of which is referred to as a train panel, specifically including train panel A, train panel B, and train panel C. This method can prevent temporary power outages in cross-connection power supply panels during power supply system maintenance, thereby improving nuclear power plant safety.

[0035] like Figure 1 As shown, the nuclear power unit switchboard maintenance method may include step S10, step S20 and step S30.

[0036] Step S10 includes: determining one of the columns of disks as a primary maintenance column, and determining one of the other two columns of disks as a secondary maintenance column.

[0037] Step S20 involves controlling the connection between the secondary maintenance train's main switchboard and the primary maintenance train's cross-feed sub-panel, and then disconnecting the primary maintenance train's main switchboard from the cross-feed sub-panel. In this step, once the secondary maintenance train's main switchboard is connected to the primary maintenance train's cross-feed sub-panel, the secondary maintenance train's main switchboard can replace the primary maintenance train's main switchboard in supplying power to the primary maintenance train's cross-feed sub-panel, causing a temporary power outage in the cross-feed sub-panel. Once the primary maintenance train's main switchboard is disconnected from the cross-feed sub-panel, maintenance work can begin on the designated equipment on the primary maintenance train.

[0038] Step S30 includes: after the main switchboard of the main maintenance train is disconnected from the cross power supply sub-panel, repairing the predetermined equipment in the main maintenance train and the cross power supply sub-panel of the secondary maintenance train; wherein the predetermined equipment does not include the cross power supply sub-panel.

[0039] Figure 2 This is a circuit diagram of each panel in some embodiments of the present invention. LVA3101TB, LVB3101TB, and LVC3101TB are the main distribution boards for the AC uninterruptible power supply systems of panels A, B, and C, respectively. LVA3701TB, LVB3701TB, and LVC3701TB are the cross-connection power supply panels for the AC uninterruptible power supply systems of panels A, B, and C, respectively. LAB and LAQ are the 2h and 12h series 220V DC power supply systems of panel B, respectively. RD is the battery charger for the DC power supply system of column B. LVB and LVQ are the 2h and 12h series 380V AC uninterruptible power supply systems (not shown) for column B. LLJ is the 380V emergency power distribution system for column C. LLI is the 380V emergency power distribution system for column B. LOB is the 380V regulated power supply system for column B. U1 and U2 are the 2h and 12h series inverters for column B. B1 and B2 are the batteries for the 2h and 12h series DC power supply systems for column B.

[0040] In some embodiments, the connection relationship between the main distribution boards of the main maintenance train and the secondary maintenance train and the cross-power supply sub-boards (a total of four distribution boards) can be controlled by operating the first switch module. In the first embodiment, the first switch module can include a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5, a sixth switch K6, and a seventh switch K7. The main distribution board of the A column panel is connected to the cross-power supply sub-board of the C column panel via the first switch K1 and the third switch K3. The main distribution board of the C column panel is connected to the cross-power supply sub-board of the A column panel via the second switch K2. The main distribution board of the C column panel is also connected to the cross-power supply sub-board of the B column panel via the fourth switch K4 and the seventh switch K7. The cross-power supply sub-board of the C column panel connects the B column panel to the main distribution board via the fifth switch K5 and the sixth switch K6.

[0041] See also Figure 2 When the first switch K1 and the third switch K3 are turned on, or the fifth switch K5 and the sixth switch K6 are turned on, the main distribution board in column A or column B can supply power to the cross-feed sub-board in column C. When the second switch K2 is turned on, the main distribution board in column C can supply power to the cross-feed sub-board in column A. When the fourth switch K4 and the seventh switch K7 are turned on, the main distribution board in column C can supply power to the cross-feed sub-board in column B.

[0042] Accordingly, in Figure 2 In an embodiment, the following steps can be performed to determine the primary maintenance train and the secondary maintenance train: when column B is designated as the primary maintenance train, column C is designated as the secondary maintenance train; when column C is designated as the primary maintenance train, column A or column B is designated as the secondary maintenance train; and when column A is designated as the primary maintenance train, column B is designated as the secondary maintenance train. Furthermore, when column C is designated as the primary maintenance train, while the cross-power supply sub-panels of the secondary maintenance train are being inspected, the cross-power supply sub-panels of columns not designated as the primary maintenance train or the secondary maintenance train will also be inspected. For example, when column C is designated as the primary maintenance train and column A is designated as the secondary maintenance train, the cross-power supply sub-panels of columns A and B will be inspected simultaneously. Furthermore, to avoid repeated maintenance of the cross-power supply sub-panel of column C, it is also possible to determine whether the cross-power supply sub-panel of column C has been repaired in this overhaul before repairing the cross-power supply sub-panel of column C. If so, the maintenance step of the cross-power supply sub-panel of column C is skipped.

[0043] In the second embodiment, the first switch module may include an eighth switch connected between the cross-power supply sub-panel in row B and the main distribution panel in row C, a ninth switch connected between the cross-power supply sub-panel in row C and the main distribution panel in row A, and a tenth switch connected between the cross-power supply sub-panel in row A and the main distribution panel in row B. In this way, when row B is designated as the primary maintenance train, row C is designated as the secondary maintenance train; when row C is designated as the primary maintenance train, row A is designated as the secondary maintenance train; and when row A is designated as the primary maintenance train, row B is designated as the secondary maintenance train. This ensures that each row of panels is designated as at least one secondary main maintenance train and one secondary maintenance train.

[0044] It should be noted that in a certain nuclear power plant, due to the limitations of the actual layout of the A, B and C columns, the first switch module preferably adopts the first embodiment, which helps to reduce the workload required to add the first switch module to the nuclear power unit.

[0045] In some embodiments, the predetermined equipment may include a main distribution board, a 2h and 12h series uninterruptible power supply system, an emergency power distribution system, a voltage-stabilized power supply system, a 2h and 12h series inverter, and a battery charger in a 2h and 12h series DC power supply system. Accordingly, the predetermined equipment in the main maintenance column and the cross-power supply sub-disk of the secondary maintenance column can be inspected and maintained by executing steps S301 and S302.

[0046] Step S301 includes overhauling the main switchboard of the main maintenance train. During the main switchboard overhaul, the main maintenance train's uninterruptible power supply (UPS), emergency power distribution system, and voltage-stabilized power supply system, as well as the secondary maintenance train's cross-connection power supply panels, are also overhauled. It should be noted that the main maintenance train's UPS systems include both 2-hour and 12-hour UPS systems. Furthermore, the overhaul of the main switchboard takes a relatively long time. Therefore, the UPS, emergency power distribution system, and voltage-stabilized power supply system of the main maintenance train, as well as the secondary maintenance train's cross-connection power supply panels, can be overhauled simultaneously with the main switchboard. This helps shorten the overhaul period and avoids major repair delays.

[0047] Step S302 includes: After the uninterruptible power supply system, emergency power distribution system, and voltage-stabilized power supply system of the main maintenance train are overhauled, the inverters and battery chargers of the main maintenance train are overhauled. In this step, inverters include 2H and 12H series inverters, and battery chargers include battery chargers in 2H and 12H series DC power supply systems. Furthermore, since the inverters and battery chargers cannot be overhauled during the emergency power distribution system overhaul, they must be overhauled only after the emergency power distribution system is overhauled.

[0048] In some embodiments, the maintenance process of the predetermined equipment may include: monitoring various operating parameters of the predetermined equipment through various sensors preset on the predetermined equipment, and judging whether the various operating parameters are all within the corresponding allowable range. When all the operating parameters of a predetermined equipment are within the corresponding allowable range, the predetermined equipment will be judged to have passed the inspection. On the contrary, if there is at least one operating parameter that is not within the corresponding allowable range, the predetermined equipment will be judged to have failed the inspection, and a relevant report will be output to prompt the staff to repair it in time. Among them, the operating parameters include but are not limited to operating temperature, input / output voltage, input / output current, and input / output electrical signal frequency. Accordingly, various sensors may include temperature sensors, current sensors, voltage sensors, and oscilloscopes. In addition, in addition to the above-mentioned maintenance items, the maintenance of the predetermined equipment also includes response time detection, mechanical component inspection, etc. It should be noted that the maintenance method for each predetermined equipment is a very mature technology, so the specific maintenance method can also refer to the existing technology.

[0049] In some embodiments, the steps of overhauling the inverter and battery charger of the main maintenance train may include: replacing the emergency power distribution system of the main maintenance train with the emergency power distribution system of the secondary maintenance train to supply power to the voltage-stabilized power supply system of the main maintenance train, and supplying power to the DC power supply system thereof through the battery of the main maintenance train to supply power to the inverter of the main maintenance train, so as to perform a power-on test on the inverter of the main maintenance train; after the inverter completes the test, supplying power to the battery charger of the main maintenance train, so as to perform a power-on test on the battery charger of the main maintenance train.

[0050] In this embodiment, by controlling the second switch module connected between the secondary maintenance train's emergency power distribution system and the primary maintenance train's voltage-regulated power supply system, the secondary maintenance train's emergency power distribution system can replace the primary maintenance train's emergency power distribution system to supply power to the primary maintenance train's voltage-regulated power supply system. Taking battery B1 as an example, when switches K11, K12, and K13, originally installed in the 2h series DC power supply system LAB, are closed, battery B1 supplies power to the DC power supply system LAB, and in turn, to the 2h series inverter U1, thus enabling a power-on test of the inverter. It should be noted that since the main distribution board and the cross-feed sub-board of the primary maintenance train are disconnected at this time, the inverter power-on test is performed under no-load conditions, thus preventing the inverter maintenance process from being affected by abnormal loads. Furthermore, the power-on test includes checking whether the inverter's output voltage and output frequency meet the corresponding requirements. Furthermore, inverter power-on testing is a mature technology, and reference can be made to the prior art for details. In addition, the maintenance of 2h series and 12h series inverters can be carried out simultaneously, which can save maintenance time.

[0051] After the inverter completes testing, the battery can be disconnected from its corresponding DC power system. For example, in the 2h series DC power system LAB, switch K can be controlled to open. Switches 14, 15, and related upstream switches can then be controlled to allow the battery charger in the main maintenance train to draw power from the upstream 220kV busbar, allowing the battery charger to be powered on. It should be noted that the battery charger power-on test method is similar to that of the inverter and will not be further described here.

[0052] Since the battery power will be consumed when the inverter is repaired, in order to ensure the safety of the nuclear power plant, in some embodiments, the batteries of the main maintenance column are also charged during the power-on test of the battery charger of the main maintenance column.

[0053] In some embodiments, as Figure 3 As shown, the nuclear power unit switchboard maintenance method may further include step S40. Step S40 includes: after completing the test on the battery charger, supplying power to the DC power supply system of the main maintenance column to preheat the diesel engine of the nuclear power unit, so as to perform a diesel engine start-up test after the diesel engine preheating is completed. In this embodiment, power can be taken from the 220KV bus to supply power to the DC power supply system of the main maintenance column, and the DC power supply system can be restored to supply power to the diesel engine and related DC cabinets, thereby preheating the diesel engine. After the diesel engine is preheated, a diesel engine start-up test is performed (which can be called TLHQ001 / 004 test in Hualong One). It should be noted that the diesel engine start-up test is a mature technology. Please refer to the existing technology for the specific test method, which will not be repeated here.

[0054] Because the diesel engine and its related control equipment may have abnormalities, there are certain safety risks during the diesel engine start-up test, such as causing a power outage in the normal power distribution system. In order to ensure that the relevant protection equipment of the diesel engine can respond normally even in the event of a power outage in the normal power distribution system, it is necessary to ensure that the battery is normal. Therefore, in some embodiments, before performing the diesel engine start-up test, it is also determined whether the battery in the main maintenance column has been charged and restored to a normal state. If so, the diesel engine start-up test is allowed. Otherwise, the diesel engine start-up test is prohibited until the battery charge has returned to a normal state. It should be noted that when the battery is charged within a set voltage range, it can be determined that the battery charge has returned to a normal state.

[0055] In order to prepare for other column maintenance or nuclear power unit to resume normal operation, in some embodiments, such as Figure 3As shown, the nuclear power unit switchboard maintenance method may further include step S50. Step S50 includes: after completing all tests, restoring the main maintenance train and the secondary maintenance train to normal state. Specifically, the restoration work includes: controlling the two batteries of the main maintenance train to restore to normal online, controlling the 2h and 12h series 220V DC power supply systems of the main maintenance train to restore normal power supply, and controlling the emergency power distribution systems of the main maintenance train and the secondary maintenance train (such as Figure 2 The LLJ and LLI in the maintenance column are restored to the normal online state, and the main distribution board controlling the main maintenance column is restored to supply power to its cross-power supply sub-board.

[0056] In order to ensure that all columns are inspected, in some embodiments, the nuclear power unit distribution panel inspection method may also include: after completing the test on the main maintenance column, the untested columns are designated as new main maintenance columns, and the corresponding new secondary maintenance columns are determined, and then steps S20, S30, S40 and S50 are executed on the new main maintenance column and the secondary maintenance column.

[0057] like Figure 4 As shown, the present invention also provides a control device, including a memory, a processor, and a computer program stored in the memory and runnable on the processor. When the processor executes the computer program, the steps of the nuclear power unit distribution board maintenance method provided in an embodiment of the present invention are implemented.

[0058] It can be understood that the present invention can avoid the situation where the cross power supply panel has a temporary power outage during the maintenance of the power supply system, thereby improving the safety of the nuclear power plant, and also has the advantages of high maintenance efficiency and short construction period of the power supply system.

[0059] The present invention also provides a nuclear power unit switchboard maintenance system, which includes the control device provided by the embodiment of the present invention.

[0060] In some embodiments, the nuclear power unit switchboard maintenance system may also include Figure 2The first switch module shown. The first switch module may include a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5, a sixth switch K6, and a seventh switch K7. The main distribution board in column A is connected to the cross-feed sub-board in column C via the first switch K1 and the third switch K3. The main distribution board in column C is connected to the cross-feed sub-board in column A via the second switch K2. The main distribution board in column C is also connected to the cross-feed sub-board in column B via the fourth switch K4 and the seventh switch K7. The cross-feed sub-board in column C connects column B to the main distribution board via the fifth switch K5 and the sixth switch K6. Furthermore, the first through seventh switches may be connected to a control device that can control the switching on and off of the first through seventh switches based on maintenance requirements. Furthermore, the first through seventh switches may each be an existing electrically controlled switch, such as a relay or contactor.

[0061] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0062] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0063] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0064] It is understandable that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A method for repairing a switchboard of a nuclear power unit, characterized in that: The nuclear power unit includes three switchboards, and the maintenance method of the switchboard of the nuclear power unit includes: One of the columns of disks is designated as the primary maintenance column, and one of the other two columns of disks is designated as the secondary maintenance column; Controlling the main switchboard of the secondary maintenance train to be connected to the cross power supply sub-panel of the main maintenance train, and then controlling the main switchboard of the main maintenance train to be disconnected from the cross power supply sub-panel; After the main distribution board of the main maintenance train is disconnected from the cross power supply sub-board, the predetermined equipment in the main maintenance train and the cross power supply sub-board of the secondary maintenance train are inspected; wherein, the predetermined equipment does not include the cross power supply sub-board.

2. The nuclear power unit switchboard maintenance method according to claim 1, characterized in that: The maintenance of the predetermined equipment in the main maintenance train and the cross-power supply sub-panel of the secondary maintenance train includes: The main switchboard of the main maintenance train is inspected and repaired. In the main switchboard inspection area, the uninterruptible power supply system, emergency power distribution system and voltage-stabilized power supply system of the main maintenance train and the cross-power supply sub-panel of the secondary maintenance train are also inspected and repaired; After the uninterruptible power supply system, emergency power distribution system and voltage-stabilized power supply system of the main maintenance train are overhauled, the inverter and battery charger of the main maintenance train are overhauled.

3. The nuclear power unit switchboard maintenance method according to claim 2, characterized in that: The inverter and battery charger of the main maintenance column are overhauled, including: The emergency power distribution system of the secondary maintenance train is used to replace the emergency power distribution system of the main maintenance train to supply power to the voltage-stabilized power supply system of the main maintenance train, and the battery of the main maintenance train is used to supply power to the DC power supply system thereof, so as to supply power to the inverter of the main maintenance train, so as to perform a power-on test on the inverter of the main maintenance train; After the inverter completes the test, power is supplied to the battery charger of the main maintenance column to perform a power-on test on the battery charger of the main maintenance column.

4. The nuclear power unit switchboard maintenance method according to claim 3, characterized in that: During the power-on test of the battery charger of the main maintenance train, the batteries of the main maintenance train are also charged.

5. The nuclear power unit switchboard maintenance method according to claim 4, characterized in that: Also includes: After completing the test on the battery charger, supply power to the DC power system of the main maintenance train to preheat the diesel engine of the nuclear power unit; After the diesel engine is preheated, perform the diesel engine start test.

6. The nuclear power unit switchboard maintenance method according to claim 5, characterized in that: Before performing the diesel engine starting test, it is determined whether the batteries of the main maintenance column are charged and restored to a normal state. If so, the diesel engine starting test is allowed; otherwise, the diesel engine starting test is prohibited.

7. The method for repairing a nuclear power plant switchboard according to any one of claims 1 to 6, characterized in that: Also includes: After all tests are completed, the main maintenance train and the secondary maintenance train are restored to normal conditions.

8. The nuclear power unit switchboard maintenance method according to claim 7, characterized in that: Also includes: After the main maintenance train is tested, the untested train is determined as a new main maintenance train, and a corresponding new secondary maintenance train is determined, and then corresponding testing steps are performed on the new main maintenance train and the secondary maintenance train.

9. A control device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the nuclear power unit distribution board maintenance method according to any one of claims 1 to 8 are implemented.

10. A nuclear power unit switchboard maintenance system, characterized in that: Comprising a control device as claimed in claim 9.

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