An automatic switching operation system and method for auxiliary power of a hydropower plant

Abstract

The present application relates to a kind of water power plant auxiliary power automatic switching operation system and method, the method uses the existing computer monitoring system of water power plant, develops the flow of sequential control for the switching operation of auxiliary power system, sequentially remote control operation field equipment after starting the flow of sequential control under certain conditions meet.The method includes drawing automatic switching operation and monitoring picture in computer monitoring system, drawing automatic switching condition monitoring picture in computer monitoring system, developing the flow of sequential control of auxiliary power automatic switching operation in computer monitoring system.The automatic switching operation method used in the present application improves the operation efficiency and safety of the switching operation of auxiliary power system of water power plant, has the misoperation blocking function, abnormal disposal function and multi-working condition self-adaptive function, improves the safety and flexibility of the automatic switching operation of auxiliary power of water power plant.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electrical switching operation of power plant auxiliary power system, in particular to a power plant auxiliary power automatic switching operation system and method. BACKGROUND

[0002] The power plant auxiliary power system can provide power supply for generator units and auxiliary equipment, and is one of the important systems in power plants. Large and medium-sized hydropower plants have a large number of auxiliary power busbars, and the wiring is complex. In order to cooperate with equipment maintenance and system operation mode adjustment, the hydropower plant needs to frequently carry out auxiliary power system switching operation.

[0003] At present, the hydropower plant carries out switching operation according to the operation ticket system, and the specific process is as follows: after receiving the operation task, the operator first fills in the operation items in a certain order to form an operation ticket, and then receives the formal operation instruction issued by the on-duty person after approval. Then the operator goes to the equipment site to operate item by item according to the order of the operation ticket, and reports to the on-duty person after the operation is completed and makes relevant operation records. During the operation process, one person needs to monitor and recite, that is, one person operates and one person monitors. First, the monitor recites the ticket loudly according to the operation ticket, and then the operator recites it correctly before operating. After completing an operation, the monitor marks a check mark behind the corresponding item in the operation ticket, and then carries out the next operation according to the above steps until all operation items in the operation ticket are completed. Except for a small number of specified situations such as accident handling, the rest of the auxiliary power switching operation is carried out according to the operation ticket. That is, even if the related equipment has remote control function, the operation ticket also needs to be filled in, and the operator needs to operate item by item in the remote control room, and the on-site inspection personnel feedback the operation results.

[0004] The existing manual switching operation mode of the hydropower plant has low operation efficiency and is time-consuming and labor-intensive. At the same time, manual switching operation is affected by human uncertain factors such as personnel skills and mental state in safety, and there is a risk in operation safety. Misoperation of power plant auxiliary power system occurs from time to time, which further leads to equipment damage and even personnel casualties. SUMMARY

[0005] In order to solve the above problems, especially for the problems of low operation efficiency and insufficient safety of the existing manual switching operation mode of the power plant auxiliary power system, the present application provides a power plant auxiliary power automatic switching operation system and method, which realizes remote one-key automatic switching operation of the power plant auxiliary power system.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0007] A power plant auxiliary power automatic switching operation method, comprising the following steps:

[0008] Step 1: Check the automatic switching operation conditions

[0009] Check the current state of all automatic switching conditions. If all conditions are green, it means that the current automatic switching operation conditions are met. If one or more conditions are red, it means that the current automatic switching operation conditions are not met, and the reasons need to be checked one by one until all conditions are met.

[0010] Step 2, start the automatic switching operation process

[0011] When the automatic switching operation conditions are met, start the instruction button, and after secondary confirmation, start the automatic switching operation process.

[0012] Step 3, monitor the automatic switching operation process

[0013] After the automatic switching operation process is started and issued, the automatic switching operation and monitoring screen is marked with different colors to indicate the operation status.

[0014] When all operation items are executed, indicate the operation success or failure information. During the execution of the automatic switching operation process, if an abnormal or accident signal is received, the process will automatically terminate.

[0015] Step 4, restore the initial state and wait for the next operation

[0016] After the automatic switching operation process is normally executed or abnormally exited, the automatic switching operation and monitoring screen is restored to the initial state through the reset button, which is convenient for the next operation.

[0017] Further, in the first step, for the automatic switching operation of the operating thermal standby of the plant power medium voltage bus, the automatic switching operation conditions include:

[0018] The LCU corresponding to the operated plant power medium voltage bus is in the remote state and is not in the debugging state;

[0019] Only one of the in-line and tie-in switches of the operated plant power medium voltage bus is in the closed position;

[0020] The in-line switch of the operated plant power medium voltage bus is in the open position, or is in the closed position and the open condition is met;

[0021] The tie-in switch of the operated plant power medium voltage bus is in the open position, or is in the closed position and the open condition is met;

[0022] The load switch of the operated plant power medium voltage bus is in the open position, or is in the closed position and the open condition is met. When the load switch of the plant power medium voltage bus is in the closed position, the low-voltage distribution room supplied by it should be operated in stages and the in-line switch of the corresponding bus meets the open condition, or the in-line switch is in the open position.

[0023] The generator set powered by the operated plant power medium voltage bus is not in the process of starting or stopping, or is in the maintenance state;

[0024] The automatic switching operation process of other sections of auxiliary power is not executed.

[0025] Further, in the third step, for the automatic switching operation of the running heat standby of the auxiliary power medium voltage bus, the sequence control process is as follows:

[0026] It is judged whether the first load switch of the auxiliary power medium voltage bus is in the closing position, otherwise it is judged whether the second load switch of the auxiliary power medium voltage bus is in the closing position, yes, it is judged whether the corresponding bus line switch of the low voltage distribution room supplied by the first load switch of the auxiliary power medium voltage bus is in the closing position;

[0027] Yes, it is judged whether the low voltage distribution room a, b section is running normally, otherwise it is judged whether the corresponding bus line switch of the low voltage distribution room supplied by the first load switch of the auxiliary power medium voltage bus is in the opening position;

[0028] Yes, it is judged whether the low voltage distribution room a, b section bus voltage is normal, otherwise the low voltage distribution room running mode does not meet the abnormal alarm and exits;

[0029] Yes, it is judged whether the low voltage distribution room backup device is in the input position, otherwise the low voltage distribution room bus voltage is abnormal alarm and exits;

[0030] Yes, the corresponding bus line switch of the low voltage distribution room supplied by the first load switch of the auxiliary power medium voltage bus is disconnected in the non-latching backup automatic mode, and it is judged whether the line switch is in the opening position, otherwise the low voltage distribution room backup device is not input alarm and exits;

[0031] Yes, it is judged whether the low voltage distribution room a, b section tie switch is in the closing position, otherwise the corresponding bus line switch of the low voltage distribution room supplied by the first load switch of the auxiliary power medium voltage bus is in the opening position, and the abnormal alarm exits;

[0032] Yes, it is judged whether the corresponding bus voltage of the low voltage distribution room supplied by the first load switch of the auxiliary power medium voltage bus is normal, otherwise the low voltage distribution room backup device is abnormal alarm and exits;

[0033] Yes, the first load switch of the auxiliary power medium voltage bus is disconnected with delay, and it is judged whether the first load switch of the auxiliary power medium voltage bus is in the opening position, otherwise the low voltage distribution room backup device is abnormal alarm and exits;

[0034] Yes, it is judged whether the second load switch of the auxiliary power medium voltage bus is in the closing position with delay, otherwise the first load switch of the auxiliary power medium voltage bus is in the opening position, and the abnormal alarm exits;

[0035] It is judged whether the corresponding bus line switch of the low voltage distribution room supplied by the first load switch of the auxiliary power medium voltage bus is in the opening position, otherwise the low voltage distribution room running mode does not meet the abnormal alarm and exits, yes, the first load switch of the auxiliary power medium voltage bus is disconnected, and it is judged whether the first load switch of the auxiliary power medium voltage bus is in the opening position;

[0036] is, then the second load switch of the medium-voltage bus for auxiliary power is in the closed position, otherwise, the first load switch of the medium-voltage bus for auxiliary power is in the open position, and an abnormal alarm is given, and the process is exited;

[0037] According to the above method for stopping power supply of the first load switch of the medium-voltage bus for auxiliary power and the low-voltage distribution room supplied thereby, the power supply of the remaining load switches of the medium-voltage bus for auxiliary power and the low-voltage distribution rooms supplied thereby is stopped. After the power supply of all the load switches of the medium-voltage bus for auxiliary power and the low-voltage distribution rooms supplied thereby is stopped, it is determined whether the incoming switch of the medium-voltage bus for auxiliary power is in the closed position;

[0038] is, then the incoming switch of the medium-voltage bus for auxiliary power is opened, and it is determined whether the incoming switch of the medium-voltage bus for auxiliary power is in the open position, otherwise, it is determined whether the tie-in switch of the medium-voltage bus for auxiliary power is in the closed position;

[0039] is, then it is determined that the voltage of the medium-voltage bus for auxiliary power is 0, otherwise, an abnormal alarm is given for the incoming switch of the medium-voltage bus for auxiliary power being in the open position, and the process is exited;

[0040] is, then the process is ended, otherwise, an abnormal alarm is given for the voltage of the medium-voltage bus for auxiliary power, and the process is exited;

[0041] It is determined whether the tie-in switch of the medium-voltage bus for auxiliary power is in the closed position, is, then the tie-in switch of the medium-voltage bus for auxiliary power is opened, and it is determined whether the tie-in switch of the medium-voltage bus for auxiliary power is in the open position, otherwise, an abnormal alarm is given for the positions of the incoming switch and the tie-in switch of the medium-voltage bus for auxiliary power, and the process is ended;

[0042] is, then it is determined that the voltage of the medium-voltage bus for auxiliary power is 0, otherwise, an abnormal alarm is given for the tie-in switch of the medium-voltage bus for auxiliary power being in the open position, and the process is exited;

[0043] is, then the process is ended, otherwise, an abnormal alarm is given for the voltage of the medium-voltage bus for auxiliary power, and the process is ended.

[0044] Further, in the first step, for the automatic switching operation of the hot standby transfer operation of the medium-voltage bus for auxiliary power, the automatic switching operation conditions include:

[0045] The upper computer of the medium-voltage bus for auxiliary power to be operated has been removed from the panel;

[0046] The LCU corresponding to the medium-voltage bus for auxiliary power to be operated is in the remote position and is not in the debugging state;

[0047] All the incoming switches, tie-in switches and load switches of the medium-voltage bus for auxiliary power to be operated are in the open position;

[0048] The operating auxiliary power medium voltage bus load switch is not in remote position, or the low voltage distribution room supplied by the medium voltage load switch is not in remote position, or the closing condition of the medium voltage load switch is met and the corresponding bus of the low voltage distribution room supplied by the medium voltage load switch is operated in tie-in operation by another bus of the distribution room and the closing condition of the incoming line switch of the corresponding bus of the low voltage distribution room supplied by the medium voltage load switch is met and the tie-in switch of the distribution room is in open condition;

[0049] The operating auxiliary power medium voltage bus protection device is not locked, not faulted and not acted;

[0050] The switch protection device of the operating auxiliary power medium voltage bus is not locked and not acted;

[0051] The generator set supplied by the operating auxiliary power medium voltage bus is not in starting or stopping process or in maintenance state;

[0052] The automatic switching operation process of other section of auxiliary power is not executed.

[0053] Further, in the third step, for the automatic switching operation of the hot standby transfer operation of the auxiliary power medium voltage bus, the sequence control process is as follows:

[0054] It is judged whether to select the incoming line switch to charge the auxiliary power medium voltage bus, otherwise it is judged whether to select the tie-in switch to charge the auxiliary power medium voltage bus, yes, it is judged whether the power supply side voltage of the incoming line switch of the auxiliary power medium voltage bus is normal;

[0055] Yes, it is judged whether the closing condition of the incoming line switch of the auxiliary power medium voltage bus is met, otherwise the power supply side voltage of the incoming line switch of the auxiliary power medium voltage bus is abnormal alarm and exit;

[0056] Yes, it is judged whether the voltage of the auxiliary power medium voltage bus is 0, otherwise the closing condition of the incoming line switch of the auxiliary power medium voltage bus is abnormal alarm and exit;

[0057] Yes, the incoming line switch of the auxiliary power medium voltage bus is closed, and it is judged whether the incoming line switch of the auxiliary power medium voltage bus is in closing position, otherwise the voltage of the auxiliary power medium voltage bus is not 0 abnormal alarm and exit;

[0058] Yes, it is judged whether the voltage of the auxiliary power medium voltage bus is normal, otherwise the closing of the incoming line switch of the auxiliary power medium voltage bus is abnormal alarm and exit;

[0059] Yes, it is delayed to judge whether the remote position of the first load switch of the auxiliary power medium voltage bus and the remote position of the low voltage distribution room are met, otherwise the voltage of the auxiliary power medium voltage bus after charging is abnormal alarm and exit;

[0060] It is judged whether to select the tie-in switch to charge the auxiliary power medium voltage bus, otherwise the selection of the charging switch of the auxiliary power medium voltage bus is abnormal alarm and exit, yes, it is judged whether the voltage of the medium voltage tie-in bus is normal;

[0061] is, then determine that the factory power medium voltage bus tie switch is in the closed position, otherwise, the medium voltage bus voltage is abnormal alarm, exit;

[0062] is, then determine that the factory power medium voltage bus tie switch closing condition is met, otherwise, the factory power medium voltage bus tie switch position is abnormal alarm, exit;

[0063] is, then determine that the factory power medium voltage bus voltage is 0, otherwise, the factory power medium voltage bus tie switch closing condition is abnormal alarm, exit;

[0064] is, then close the factory power medium voltage bus tie switch, and determine that the factory power medium voltage bus tie switch is in the closed position, otherwise, the factory power medium voltage bus voltage is not 0 abnormal alarm, exit;

[0065] is, then determine that the factory power medium voltage bus voltage is normal, otherwise, the factory power medium voltage bus tie switch closing is abnormal alarm, exit;

[0066] is, then delay to determine that the factory power medium voltage bus first load switch is in the remote position and the low voltage distribution room supplied by the first load switch is in the remote position, otherwise, the factory power medium voltage bus voltage is abnormal alarm after charging, exit;

[0067] is, then close the factory power medium voltage bus first load switch, and determine that the factory power medium voltage bus first load switch is in the closed position, otherwise, determine that the factory power medium voltage bus second load switch is in the remote position and the low voltage distribution room supplied by the second load switch is in the remote position;

[0068] is, then delay to determine that the low voltage distribution room corresponding to the first load switch of the factory power medium voltage bus is supplied by another bus of the distribution room, otherwise, the factory power medium voltage bus first load switch closing is abnormal alarm, exit;

[0069] is, then determine that the low voltage distribution room a, b section bus voltage is normal, otherwise, the low voltage distribution room is not in the tie operation abnormal alarm, exit;

[0070] is, then open the low voltage distribution room tie switch, and determine that the low voltage distribution room tie switch is in the open position, otherwise, the low voltage distribution room a, b section bus voltage is abnormal alarm, exit;

[0071] is, then determine that the low voltage distribution room corresponding to the first load switch of the factory power medium voltage bus is 0, otherwise, the low voltage distribution room tie switch is abnormal alarm, exit;

[0072] is, then delay to close the low voltage distribution room corresponding to the first load switch of the factory power medium voltage bus, and determine that the low voltage distribution room tie switch is in the closed position, otherwise, the low voltage distribution room corresponding to the first load switch of the factory power medium voltage bus voltage is not 0 abnormal alarm;

[0073] is, then judging that the low-voltage distribution room corresponding to the first load switch of the plant power medium-voltage bus is normal, otherwise, the low-voltage distribution room corresponding to the first load switch of the plant power medium-voltage bus is abnormal, and the process is exited;

[0074] is, then delaying to judge that the second load switch of the plant power medium-voltage bus is remotely located and the low-voltage distribution room supplied thereby is remotely located, otherwise, the low-voltage distribution room corresponding to the first load switch of the plant power medium-voltage bus is abnormal;

[0075] According to the above method of power supply recovery operation of the first load switch of the plant power medium-voltage bus and the low-voltage distribution room supplied thereby, the power supply recovery operation of the remaining load switches of the plant power medium-voltage bus and the low-voltage distribution rooms supplied thereby is continued, and the process is ended.

[0076] On the other hand, the present application also relates to an automatic switching system for plant power of a hydropower plant, which is suitable for the above method and comprises a preprocessing module, an input module, an output module, a display module and a protection module.

[0077] The preprocessing module checks the current state of all automatic switching conditions, and if one or more conditions are not met, the processing module checks the reasons one by one and gives corresponding prompts until all conditions are met.

[0078] When the automatic switching operation conditions are met, the automatic switching operation process is started after secondary confirmation through the input module.

[0079] After the automatic switching operation process is started, the output module issues various operation instructions for actual device operation, and the display module identifies the device operation state with different colors.

[0080] When all operation items are executed, the display module indicates operation success or failure information; during the execution of the automatic switching operation process, when an abnormal protection action or an accident signal is received, the protection module automatically terminates the process.

[0081] After the automatic switching operation process is normally executed or abnormally exited, the automatic switching operation and monitoring screen are restored to the initial state through the input module.

[0082] The present application uses the existing computer monitoring system of a hydropower plant to develop a sequence control process for plant power switching operation, and after starting the sequence control process under certain conditions, the on-site devices are remotely controlled in sequence, so as to realize one-key automatic operation of common switching operation tasks of the plant power system.

[0083] The implementation of the functions described in the method includes the following devices: a computer monitoring system, a plant power system related device, and a communication device between the two. Among them, the computer monitoring system is built-in with automatically tested automatic switching operation sequence control processes and related operations, and monitoring pictures. The plant power system related device needs to have remote control operation capability. The method includes the following contents: drawing automatic switching operation and monitoring pictures in the computer monitoring system; drawing automatic switching condition monitoring pictures in the computer monitoring system; developing plant power automatic switching operation sequence control processes in the computer monitoring system.

[0084] The automatic switching operation and monitoring pictures include a switching condition state display button, a start instruction button, a switching state indication box, a switching process monitoring picture, and a reset button.

[0085] The switching condition state display button is displayed in green when the switching condition is met, and is displayed in red when the switching condition is not met. Clicking the switching condition state display button pops up the automatic switching condition monitoring picture.

[0086] The start instruction button can be clicked on the premise that the switching condition state display button is displayed in green. If the switching condition state display button is displayed in red, clicking the start instruction button is invalid, and the system automatically locks the start of the automatic switching operation process. After clicking the start instruction button, an automatic switching operation task secondary confirmation window is popped up, and after clicking the "confirm" button therein, the operation instruction is issued.

[0087] The switching state indication box has no display when the automatic switching operation is not executed. When the automatic switching operation is in the execution process, the switching state indication box displays "switching in process". When the automatic switching operation is executed and there is no any exception, the switching state indication box displays "switching success". When the automatic switching operation is executed abnormally and exits the operation, the switching state indication box displays "switching failure".

[0088] The switching process monitoring picture lists each operation item in the sequence control process from top to bottom in the form of a block diagram, which is a visual display of the execution progress of the automatic switching operation sequence control process. The block diagram of the operation item that has been normally completed is displayed in green, the block diagram of the operation item that has not been executed is displayed in gray, the block diagram of the operation item that is being executed is displayed in the form of green flicker, and the block diagram of the operation item that is executed abnormally is displayed in red.

[0089] The reset button is used to manually terminate the automatic switching operation, and to restore the automatic switching operation and monitoring picture to the initial state after the automatic switching operation is completed, so as to facilitate the next operation.

[0090] The automatic switching condition monitoring picture contains a list of all prerequisites required for performing the automatic switching operation task. Each condition in the list is represented by green if the condition is met, and red if the condition is not met. When all conditions are met, it indicates that the switching condition of the switching operation task is met, and the switching condition status display button is displayed in green. When any condition is not met, it indicates that the switching condition of the switching operation task is not met, and the switching condition status display button is displayed in red. The setting of the automatic switching condition considers all relevant conditions required during the operation, which are checked before the automatic switching operation sequence control process is started, avoiding the frequent exit of the process after the process is started due to incomplete automatic switching condition setting.

[0091] The automatic switching operation sequence control process is a program composed of a plurality of operation items in a certain order, which can complete a certain operation control task. Each operation item in the sequence control process includes an operation instruction part and an operation check part. The operation instruction part is responsible for issuing specific operation instructions, and the operation check part is responsible for checking whether the state feedback of the operation object after the operation instruction is issued meets the required state of the operation instruction. If the required state is not met, the sequence control process either continues to execute the subsequent operation item after an alarm is given, or directly exits the sequence control process.

[0092] The automatic switching operation sequence control process, on the basis of completing the specified operation control task, has the following functions to ensure operation safety and flexibility: anti-misoperation locking function, abnormality handling function, and multi-working condition adaptive function.

[0093] The anti-misoperation locking function requires that each operation item in the sequence control process meet the "five-prevention" locking logic requirements. When the "five-prevention" locking conditions of the operation item are not met, the sequence control process will not issue the operation instruction of the item.

[0094] The abnormality handling function includes automatic abnormality handling function and manual abnormality handling function. The former means that when the computer monitoring system receives an abnormal or accident signal such as a protection action during the execution of the sequence control process, the process can be automatically terminated. The latter means that the operation personnel can terminate the automatic switching operation process at any time during the execution of the sequence control process.

[0095] The multi-working condition adaptive function enables the sequence control process to adapt to the automatic switching operation requirements in various operating modes, avoiding the situation of single applicable working condition and frequent exit of the process during execution. The operating mode of the partial load switch and the partial low-voltage distribution room it carries does not affect the operation of the medium-voltage bus during the operation of the medium-voltage bus of the plant power supply. During the operation of the medium-voltage bus of the plant power supply, the sequence control process can automatically jump to operation according to the control mode, switch position, and other state signals of the load switch or the low-voltage distribution room it carries.

[0096] Therefore, the automatic switching operation method improves the operation efficiency and safety of the switching operation of the power plant auxiliary power system.

[0097] The automatic switching operation method has the anti-misoperation locking function, the abnormality handling function and the multi-working condition self-adaptive function, and improves the safety and flexibility of the automatic switching operation of the power plant auxiliary power system. BRIEF DESCRIPTION OF DRAWINGS

[0098] Figure 1 A typical primary wiring diagram of a medium-voltage auxiliary power bus in a hydropower plant of the embodiment of the present application;

[0099] Figure 2 A 10kV auxiliary power 1st section operation to heat standby automatic switching operation and monitoring screen of the embodiment of the present application;

[0100] Figure 3 A 10kV auxiliary power 1st section operation to heat standby automatic switching operation condition monitoring screen of the embodiment of the present application;

[0101] Figure 4 A 10kV auxiliary power 1st section operation to heat standby automatic switching operation sequence control first part flow chart of the first embodiment of the present application;

[0102] Figure 5 A 10kV auxiliary power 1st section operation to heat standby automatic switching operation sequence control second part flow chart of the first embodiment of the present application;

[0103] Figure 6 A 10kV auxiliary power 1st section operation to heat standby automatic switching operation sequence control third part flow chart of the first embodiment of the present application;

[0104] Figure 7 A 10kV auxiliary power 1st section operation to heat standby automatic switching operation sequence control fourth part flow chart of the first embodiment of the present application;

[0105] Figure 8 A 10kV auxiliary power 1st section heat standby to operation automatic switching operation and monitoring screen of the first embodiment of the present application;

[0106] Figure 9 A 10kV auxiliary power 1st section heat standby to operation automatic switching operation condition monitoring screen of the first embodiment of the present application;

[0107] Figure 10 A 10kV auxiliary power 1st section heat standby to operation automatic switching operation sequence control first part flow chart of the second embodiment of the present application;

[0108] Figure 11The second part flow chart of the order control of the automatic switching operation of the 10kV auxiliary power 1 section hot standby to running of the second embodiment of the present application;

[0109] Figure 12 The third part flow chart of the order control of the automatic switching operation of the 10kV auxiliary power 1 section hot standby to running of the second embodiment of the present application;

[0110] Figure 13 The fourth part flow chart of the order control of the automatic switching operation of the 10kV auxiliary power 1 section hot standby to running of the second embodiment of the present application. DETAILED DESCRIPTION

[0111] The technical solutions in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0112] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as the common meanings understood by those skilled in the art. The terms "first", "second", and similar terms used in the embodiments do not represent any order, number, or importance, but are only used to distinguish different components. The terms "include", "contain", and similar terms mean that the components or objects before the terms cover the components or objects listed after the terms and their equivalents, and do not exclude other components or objects. The terms "mount", "connect", and "connect" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. The terms "up", "down", "left", "right", "horizontal", and "vertical" are only used to describe the relative positions of the components in the drawings, and these directional terms are relative concepts, which are used for relative description and clarification, and can be changed accordingly according to the change of the position of the components in the drawings.

[0113] Figure 1A typical primary connection diagram of a medium-voltage plant bus in a hydropower plant is drawn. The medium-voltage plant bus voltage level is 10 kV, and the name is 10 kV plant bus 1 section, which contains one incoming switch 0011, three load switches 00101, 00102 and 00103. The 10 kV plant bus 1 section is connected with the 10 kV plant bus 2 section through the tie switch 001011 and the tie switch 0020. The three load switches 00101, 00102 and 00103 respectively supply power to a 400V power distribution room a section through a step-down transformer, wherein the 00101 switch supplies power to the 400V No.1 unit self-use power a section, the 00102 switch supplies power to the 400V No.2 unit self-use power a section, and the 00103 switch supplies power to the 400V first group public power a section. Each 400V power distribution room is a single mother segmented connection, which is respectively a section and a section, each section has an incoming switch, and a tie switch is arranged between the two sections. Among them, the 400V No.1 unit self-use power a section incoming switch is 4311, the b section incoming switch is 4312, and the a, b section tie switch is 4313; the 400V No.2 unit self-use power a section incoming switch is 4321, the b section incoming switch is 4322, and the a, b section tie switch is 4323; the 400V first group public power a section incoming switch is 4401, the b section incoming switch is 4402, and the a, b section tie switch is 4403.

[0114] Example 1

[0115] The following is for the above Figure 1 The typical primary connection diagram of the medium-voltage plant bus in the hydropower plant is taken as an example to illustrate the automatic switching operation implementation method of the plant power system in the hydropower plant as follows:

[0116] This example includes the following contents: drawing the 10 kV plant bus 1 section running to heat standby automatic switching operation and monitoring screen in the computer monitoring system; drawing the 10 kV plant bus 1 section running to heat standby automatic switching condition monitoring screen in the computer monitoring system; developing the 10 kV plant bus 1 section running to heat standby automatic switching operation sequence control process in the computer monitoring system.

[0117] As shown in Figure 2 , it is the operation and monitoring screen of the 10 kV plant bus 1 section running to heat standby automatic switching operation in the computer monitoring system. The screen includes operation buttons and state indication boxes on the top and switching process monitoring screen on the bottom, wherein the operation buttons and state indication boxes include the "switching condition" button, the "start instruction" button, the "reset" button and the "switching state" indication box. When the "switching condition" button is displayed in green, it indicates that the switching condition is met, and when it is displayed in red, it indicates that the switching condition is not met. Clicking the "switching condition" button pops up the automatic switching condition monitoring screen.

[0118] The "start instruction" button can be clicked on the premise that the "switching condition" button is displayed in green. After the "start instruction" button is clicked, an automatic switching operation task secondary confirmation window is popped up, and the operation instruction is issued after the "confirm" button in the window is clicked.

[0119] After the operation instruction is normally issued, the "switching state" indication box displays "switching process", and the switching process monitoring picture prompts the current operation item in a flashing manner. The completed operation item is displayed in green, and the unperformed operation item is displayed in gray. The switching process monitoring picture is divided into four parts according to the operation items of the present operation task, which are, in sequence, the 400V No. 1 machine self-use power a section and 00101 switch operation monitoring part, the 400V No. 2 machine self-use power a section and 00102 switch operation monitoring part, the 400V first group public power a section and 00103 switch operation monitoring part, and 0011 or 0020 switch operation monitoring part. For each operation monitoring part, the left side is the instruction issuing monitoring, and the corresponding instruction box is displayed in green after the instruction is issued, and the unissued instruction is displayed in yellow. The right side is the device state monitoring corresponding to the left instruction, and is displayed in green when the real-time state of the device is consistent with the target state of the instruction, and is displayed in yellow when the real-time state of the device is inconsistent with the target state of the instruction. Taking the 400V No. 1 machine self-use power a section and 00101 switch operation monitoring part as an example, when the automatic switching operation sequence control flow issues the "disconnect 4311 switch" instruction, the "disconnect 4311 switch" instruction box on the left side of the operation monitoring part changes from gray to green. When the 4311 switch is disconnected and the disconnection signal is received, the front state indication small square of the "4311 switch disconnection position" on the right side of the operation monitoring part changes from yellow to green. After the 4311 switch is disconnected, the 400V No. 1 machine group self-use power a section loses voltage, and the standby device will automatically act and close the 400V No. 1 machine group self-use power a and b section tie-in 4313 switch. At this time, the voltage of the 400V No. 1 machine self-use power a section returns to normal. When the 4313 switch is closed and the closing signal is received, the front state indication small square of the "4313 switch closing position" on the right side of the operation monitoring part changes from yellow to green, and the front state indication small square of the "No. 1 machine self-use power a section bus voltage normal" changes from yellow to green. When the automatic switching operation sequence control flow issues the "disconnect 00101 switch" instruction, the "disconnect 00101 switch" instruction box on the left side of the operation monitoring part changes from gray to green. When the 00101 switch is disconnected and the disconnection signal is received, the front state indication small square of the "00101 switch disconnection position" on the right side of the operation monitoring part changes from yellow to green. The pictures of the remaining three operation monitoring parts are similar to those of the 400V No. 1 machine group self-use power a section and 00101 switch operation monitoring part. When all operation items are successfully executed, the "switching state" indication box displays "switching success". When any operation item is executed abnormally and causes the automatic switching operation sequence control flow to exit, the "switching state" indication box displays "switching failure". During the execution of the automatic switching operation sequence control flow, the "reset" button can be clicked at any time to terminate the execution of the sequence control flow. The "reset" button has a secondary confirmation link to prevent human error. After all operation items are successfully executed or abnormally exited, the "reset" button can restore the switching process monitoring picture to the initial state, facilitating the next operation.

[0120] like Figure 3 The image shows the monitoring screen for the automatic switching operation conditions of the 10kV plant auxiliary power section 1 during its operation and standby phase. This screen is accessed by clicking the "Switching Conditions" button on the operation and monitoring screen for the automatic switching operation of the 10kV plant auxiliary power section 1 during its operation and standby phase. This screen lists all the prerequisites and their current status for the automatic switching operation of the 10kV plant auxiliary power section 1 during its operation and standby phase. Each condition is indicated by a status indicator circle, with green representing that the condition is met and red representing that the condition is not met. When all conditions are met, the switching conditions for the automatic switching operation of the 10kV plant auxiliary power section 1 during its operation and standby phase are satisfied; when any condition is not met, the switching conditions are not satisfied.

[0121] Figures 4-7 The diagram shows the sequential control flow chart for the automatic switching operation of the 10kV plant power supply section 1 from operation to standby. It is divided into four parts according to the operation items.

[0122] like Figure 4 The diagram shows the first part of the automatic switching operation sequence for the 10kV plant auxiliary power section 1, transitioning to hot standby mode: the operation of the 400V Unit 1 self-use power section a and the 00101 switch. The specific procedure is as follows:

[0123] start:

[0124] Is "00101 switch in the closed position"?

[0125] Yes: 4311 closed position, No: LOOP11;

[0126] Is it in the "4311 closed position"?

[0127] Yes: 4312 closed and 4313 open; No: 4311 open.

[0128] Is it "4312 closed and 4313 open"?

[0129] Yes: The voltage of the A section bus of Unit 1's self-use power supply is normal and the voltage of the B section is normal; No: The 400V Unit 1 self-use power supply operation mode does not meet the conditions and an abnormal alarm is triggered, and the process exits.

[0130] Is it true that "the voltage of the A section busbar for Unit 1's self-use power is normal and the voltage of the B section is normal"?

[0131] Yes: Pump No. 1 for technical water supply of Unit 1 is not running; No: 400V Unit 1 self-use power bus voltage abnormal alarm, process exit;

[0132] Is "Pump No. 1 for technical water supply of Unit 1 not running"?

[0133] Yes: 400V No. 1 machine self-use power backup device is in the input position, No: No. 1 machine technical water supply pump operation mode abnormal alarm, process exit;

[0134] Yes: "400V No. 1 machine self-use power backup device is in the input position":

[0135] Yes: disconnect 4311 switch (not lock backup), 4311 switch in the off position, No: 400V No. 1 machine self-use power backup device is not input alarm, process exit;

[0136] Yes: "4311 switch is in the off position":

[0137] Yes: 4313 switch is in the on position, No: 4311 switch off abnormal alarm, process exit;

[0138] Yes: "4313 switch is in the on position":

[0139] Yes: 400V No. 1 machine self-use power a bus voltage is normal, No: 400V No. 1 machine self-use power backup device action abnormal alarm, process exit;

[0140] Yes: "400V No. 1 machine self-use power a bus voltage is normal":

[0141] Yes: delay 5s, disconnect 00101 switch, 00101 switch in the off position, No: 400V No. 1 machine self-use power backup device action abnormal alarm, process exit;

[0142] Yes: "00101 switch is in the off position":

[0143] Yes: delay 10s, LOOP11, No: 00101 switch off abnormal alarm, process exit;

[0144] Yes: "4311 off position":

[0145] Yes: disconnect 00101 switch, 00101 switch in the off position, No: No. 1 machine self-use power operation mode does not meet the condition of abnormal alarm, process exit;

[0146] Yes: "00101 switch is in the off position":

[0147] Yes: delay 10s, LOOP11, No: 00101 switch off abnormal alarm, process exit.

[0148] As shown in Figure 5 , it is the second part of the 10kV plant power 1 section operation heat backup automatic switching operation sequence control process: 400V No. 2 machine self-use power a section and 00102 switch operation part. The specific process is as follows:

[0149] LOOP11:

[0150] Is "00102 switch in the closed position"?

[0151] Yes: 4321 closed position, No: LOOP12

[0152] Is "4321 closed position"?

[0153] Yes: 4322 closed and 4323 open, No: 4321 open position

[0154] Is "4322 closed and 4323 open"?

[0155] Yes: 2# machine self-use power a section bus voltage normal and b section voltage normal, No: 400V 2# machine self-use power operation mode does not meet the condition abnormal alarm, process exits

[0156] Is "2# machine self-use power a section bus voltage normal and b section voltage normal"?

[0157] Yes: 2# machine technical water supply 1# pump not running, No: 400V 2# machine self-use power bus voltage abnormal alarm, process exits

[0158] Is "2# machine technical water supply 1# pump not running"?

[0159] Yes: 400V 2# machine self-use power backup device is in the input position, No: 2# machine technical water supply pump operation mode abnormal alarm, process exits

[0160] Is "400V 2# machine self-use power backup device is in the input position"?

[0161] Yes: disconnect 4321 switch (not closed backup self-throw), 4321 switch in open position, No: 400V 2# machine self-use power backup device not input alarm, process exits

[0162] Is "4321 switch in open position"?

[0163] Yes: 4323 switch in closed position, No: 4321 switch open abnormal alarm, process exits

[0164] Is "4323 switch in closed position"?

[0165] Yes: 400V 2# machine self-use power a section bus voltage normal, No: 400V 2# machine self-use power backup device action abnormal alarm, process exits

[0166] Is "400V 2# machine self-use power a section bus voltage normal"?

[0167] Yes: delay 5s, open 00102 switch, 00102 switch is in the open position, No: 400V No. 2 machine self-use power backup device action abnormal alarm, the flow exits;

[0168] Is "00102 switch in open position":

[0169] Yes: delay 10s, LOOP12, No: 00102 switch open abnormal alarm, the flow exits;

[0170] Is "4321 open position":

[0171] Yes: open 00102 switch, 00102 switch is in the open position, No: No. 2 machine self-use power operation mode does not meet the condition abnormal alarm, the flow exits;

[0172] Is "00102 switch in open position":

[0173] Yes: delay 10s, LOOP12, No: 00102 switch open abnormal alarm, the flow exits.

[0174] As shown in Figure 6 , it is the third part of the 10kV plant power 1 section operation heat standby automatic switching operation sequence control flow: 400V first group of public electricity a section and 00103 switch operation part. The specific flow is as follows:

[0175] LOOP12:

[0176] Is "00103 switch in closed position":

[0177] Yes: 4401 closed position, No: LOOP13;

[0178] Is "4401 closed position":

[0179] Yes: 4402 closed and 4403 open, No: 4401 open position;

[0180] Is "4402 closed and 4403 open":

[0181] Yes: first group of public electricity a section bus voltage is normal and b section voltage is normal, No: 400V first group of public electricity operation mode does not meet the condition abnormal alarm, the flow exits;

[0182] Is "first group of public electricity a section bus voltage is normal and b section voltage is normal":

[0183] Yes: 400V first group of public electricity backup device is in the input position, No: 400V first group of public electricity bus voltage abnormal alarm, the flow exits;

[0184] Is "400V first group of public electricity backup device in input position":

[0185] Is: 4401 switch is open (not closed backup), 4401 switch is in the open position, no: 400V first group of public power backup device alarm, the process exits;

[0186] Is "4401 switch in the open position":

[0187] Yes: 4403 switch is in the closed position, no: 4401 switch open abnormal alarm, the process exits;

[0188] Is "4403 switch in the closed position":

[0189] Yes: 400V first group of public power a section bus voltage is normal, no: 400V first group of public power backup device action abnormal alarm, the process exits;

[0190] Is "400V first group of public power a section bus voltage is normal":

[0191] Yes: delay 5s, open 00103 switch, 00103 switch is in the open position, no: 400V first group of public power backup device action abnormal alarm, the process exits;

[0192] Is "00103 switch in the open position":

[0193] Yes: delay 10s, LOOP13, no: 00103 switch open abnormal alarm, the process exits;

[0194] Is "4401 open position":

[0195] Yes: open 00103 switch, 00103 switch is in the open position, no: the first group of public power operation mode does not meet the condition of abnormal alarm, the process exits;

[0196] Is "00103 switch in the open position":

[0197] Yes: delay 10s, LOOP13, no: 00103 switch open abnormal alarm, the process exits.

[0198] As shown in Figure 7 , it is the fourth part of the 10kV auxiliary power 1 section operation heat standby automatic switching operation sequence control process: 0011 or 0020 switch operation part. The specific process is as follows:

[0199] LOOP13:

[0200] Is "0011 switch in the closed position":

[0201] Yes: open 0011 switch (latch backup), 0011 switch is in the open position, no: 0020 switch is in the closed position;

[0202] Is the "0011 switch in the open position"?

[0203] Yes: 10kV plant power 1 segment voltage is 0, no: 0011 switch abnormal alarm, the process is over;

[0204] Is the "10kV plant power 1 segment voltage is 0"?

[0205] Yes: the process is over, no: 10kV plant power 1 segment voltage abnormal alarm, the process is over;

[0206] Is the "0020 switch in the closed position"?

[0207] Yes: disconnect 0020 switch, 0020 switch in the open position, no: 10kV plant power 1 segment incoming line and tie switch position abnormal alarm, the process is over;

[0208] Is the "0020 switch in the open position"?

[0209] Yes: 10kV plant power 1 segment voltage is 0, no: 0020 switch abnormal alarm, the process is over;

[0210] Is the "10kV plant power 1 segment voltage is 0"?

[0211] Yes: the process is over, no: 10kV plant power 1 segment voltage abnormal alarm, the process is over.

[0212] 10kV plant power 1 segment running heat standby automatic switching operation, the specific operation steps are as follows:

[0213] First, check the 10kV plant power 1 segment running heat standby automatic switching operation condition: open the 10kV plant power 1 segment running heat standby automatic switching condition monitoring screen in the computer monitoring system, check the current state of all conditions, if all conditions are displayed as green, it means that the current automatic switching operation condition is met, if one or more conditions are displayed as red, it means that the current automatic switching operation condition is not met, the reason needs to be checked one by one until all conditions are met.

[0214] Second, start the 10kV plant power 1 segment running heat standby automatic switching operation process: when the automatic switching operation condition is met, open the 10kV plant power 1 segment running heat standby automatic switching operation and monitoring screen in the computer monitoring system, check the switching condition state display button is green, click the start instruction button, after twice confirmation, start the 10kV plant power 1 segment running heat standby automatic switching operation process, at this time the switching state indication box displays "switching process".

[0215] Third step, monitor 10kV plant power 1 segment operation heat standby automatic switching operation process execution process: after the automatic switching operation process is started and issued, the 10kV plant power 1 segment operation heat standby automatic switching operation and the monitoring picture in the picture, the operation item block diagram currently being executed is displayed in the form of green flashing, the operation item block diagram that has been normally completed is displayed in green, the operation item block diagram that has not been executed is displayed in gray, and the operation item block diagram that executes abnormally is displayed in red. When Figure 4-1 , 4-2, 4-3, 4-4, the switching state indication box displays "switching success", when the operation item executes abnormally, the switching state indication box displays "switching failure". During the execution of the automatic switching operation process, when the computer monitoring system receives related protection actions and other abnormal or accident signals, the process can be automatically terminated. When the operator considers it necessary to terminate the automatic switching operation process, the operator clicks the reset button in the automatic switching operation and monitoring picture, and terminates the 10kV plant power 1 segment operation heat standby automatic switching operation process execution at any time after secondary confirmation.

[0216] Fourth step, restore the initial state and wait for the next operation: after the 10kV plant power 1 segment operation heat standby automatic switching operation process is normally executed or abnormally exited, click the reset button in the automatic switching operation and monitoring picture to restore the automatic switching operation and monitoring picture to the initial state, so as to facilitate the next operation.

[0217] Example 2

[0218] The following is for the above Figure 1 The typical primary wiring diagram of the medium voltage plant power bus in the hydropower plant is taken as an example, and the automatic switching operation implementation method of the plant power system in the hydropower plant is described as follows:

[0219] This embodiment includes the following contents: drawing the 10kV plant power 1 segment heat standby automatic switching operation and monitoring picture in the computer monitoring system; drawing the 10kV plant power 1 segment heat standby automatic switching condition monitoring picture in the computer monitoring system; developing the 10kV plant power 1 segment heat standby automatic switching operation sequence control process in the computer monitoring system.

[0220] As Figure 8 shown, it is the operation and monitoring picture of the 10kV plant power 1 segment heat standby automatic switching operation in the computer monitoring system. The Figure 2Similarly, the picture includes two parts, the upper part is the operation button and the state indication box, and the lower part is the switching process monitoring picture, wherein the operation button and the state indication box include the "switching condition" button, the "start instruction" button, the "reset" button, the "switching state" indication box and the unblanking state indication box. The "switching condition" button, the "start instruction" button, the "reset" button and the "switching state" indication box have the same functions and operations as the corresponding buttons and indication boxes in the embodiment 1 Figure 2 ; the unblanking state indication box displays "unblanked" and is green when the current bus has the condition of hot standby operation to run, and displays "unblanked" and is red when the current bus does not have the condition of hot standby operation to run; and the unblanking and blanking are manually operated by the operator on the computer monitoring system.

[0221] The switching process monitoring picture is divided into four parts according to the operation items of the operation task, and the four parts are, in sequence, the 0011 or 0020 switch operation monitoring part, the 00101 switch and 400V No. 1 machine self-use power a section operation monitoring part, the 00102 switch and 400V No. 2 machine self-use power a section operation monitoring part, and the 00103 switch and 400V first group public power a section operation monitoring part. Each operation monitoring part includes instruction issuing monitoring and device state monitoring. After the instruction is issued, the instruction box corresponding to the instruction issuing monitoring is displayed in green, and the instruction not issued is displayed in yellow; when the real-time state of the device is consistent with the target state of the instruction, the device state monitoring is displayed in green, and when it is inconsistent, it is displayed in yellow. Taking the 0011 or 0020 switch operation monitoring part as an example for description: this part has two possible bus charging modes, one is to charge the 10kV plant power 1 section bus by closing the 0011 switch, and the other is to charge the 10kV plant power 1 section bus by closing the 0020 switch, and the specific bus charging mode is manually selected after the "start instruction" button is clicked. If the 0011 switch is selected to charge the bus, when the automatic switching operation sequence control flow issues the "close the 0011 switch" instruction, the "close the 0011 switch" instruction box of the operation monitoring part changes from gray to green; when the 0011 switch is closed and the closing signal is received, the "0011 switch closing position" front state indication small square of the operation monitoring part changes from yellow to green; after the 0011 switch is closed, the 10kV plant power 1 section bus voltage returns to normal, and the "plant power 1 section bus voltage normal" front state indication small square changes from yellow to green. The pictures of the other three operation monitoring parts are similar to the 00101 switch and 400V No. 1 machine self-use power a section operation monitoring part.

[0222] As Figure 9The image shown is the monitoring screen for the automatic switching operation conditions of the 10kV plant power supply section 1 (hot standby to operation). This screen is displayed by clicking the "Switching Conditions" button on the operation and monitoring screen for the 10kV plant power supply section 1 (hot standby to operation). This screen lists all the prerequisites and their current status for the automatic switching operation of the 10kV plant power supply section 1 (hot standby to operation). Each condition is indicated by a status indicator circle, with green representing that the condition is met and red representing that the condition is not met. When all conditions are met, the switching conditions for the 10kV plant power supply section 1 (hot standby to operation) automatic switching operation are met; when any condition is not met, the switching conditions are not met.

[0223] Figures 10-13 The diagram shows the sequential control flow chart for the automatic switching operation of the 10kV plant power supply section 1 from hot standby to operation. It is divided into four parts according to the operation items.

[0224] like Figure 10 The diagram shows the first part of the automatic switching operation sequence for the 10kV plant power supply section from hot standby to operation: the 0011 or 0020 switch operation section. The specific procedure is as follows:

[0225] start:

[0226] Does the system "charge the bus using switch 0011"?

[0227] Yes: 0011 Switching power supply side voltage is normal; No: Charge the bus using switch 0020.

[0228] Is "0011 Switching power supply side voltage normal"?

[0229] Yes: 0011 Switch closing conditions met; No: 0011 Switch power supply side voltage abnormal alarm, process exit;

[0230] Does "0011 switch closing conditions meet"?

[0231] Yes: The voltage of the 10kV plant power supply section 1 bus is 0; No: Alarm alarm for abnormal switch closing conditions 0011, process exit.

[0232] Is the voltage of the 10kV plant auxiliary power supply section 1 busbar 0?

[0233] Yes: Close switch 0011. Switch 0011 is in the closed position. No: 10kV plant power supply section 1 bus voltage abnormal alarm, process exit.

[0234] Is "0011 switch in the closed position"?

[0235] Yes: The voltage of the 10kV plant power supply section 1 bus is normal; No: Alarm alarm for abnormal switch closing 0011, process exit.

[0236] Is "10kV plant power 1 segment bus voltage normal"?

[0237] Yes: delay 10s, LOOP21, No: 10kV plant power 1 segment bus voltage abnormal alarm, process exit;

[0238] Is "with 0020 switch to bus charging"?

[0239] Yes: 10kV plant power 2 segment bus voltage normal, No: bus charging switch selection abnormal alarm, process exit;

[0240] Is "10kV plant power 2 segment bus voltage normal"?

[0241] Yes: 001011 switch in working position, No: 10kV plant power 2 segment bus voltage abnormal alarm, process exit;

[0242] Is "001011 switch in working position"?

[0243] Yes: 0020 switch closing condition is met, No: 001011 switch position abnormal alarm;

[0244] Is "0020 switch closing condition is met"?

[0245] Yes: 10kV plant power 1 segment bus voltage is 0, No: 0020 switch closing condition abnormal alarm, process exit;

[0246] Is "10kV plant power 1 segment bus voltage is 0"?

[0247] Yes: close 0020 switch, 0020 switch in closing position, No: 10kV plant power 1 segment bus voltage abnormal alarm, process exit;

[0248] Is "0020 switch in closing position"?

[0249] Yes: 10kV plant power 1 segment bus voltage normal, No: 0020 switch closing abnormal alarm;

[0250] Is "10kV plant power 1 segment bus voltage normal"?

[0251] Yes: delay 10s, LOOP21, No: 10kV plant power 1 segment charging bus voltage abnormal alarm, process exit.

[0252] As shown in Figure 11 , it is the second part of the 10kV plant power 1 segment hot standby transfer operation automatic switching control process: 00101 switch and 400V No. 1 machine self-use power a segment operation part. The specific process is as follows:

[0253] LOOP21:

[0254] Is "00101 switch is in the on position"?

[0255] Yes: close 00101 switch, 00101 switch is in the on position, No: LOOP22;

[0256] Is "00101 switch is in the on position"?

[0257] Yes: delay 10s, 4312 on & 4313 on & 4311 off, No: 00101 switch on abnormal alarm, flow exits;

[0258] Is "4312 on & 4313 on & 4311 off"?

[0259] Yes: 1# unit self-use power a section & b section voltage is normal, No: 400V 1# unit self-use power not connected to run abnormal alarm, flow exits;

[0260] Is "1# unit self-use power a section & b section voltage is normal"?

[0261] Yes: disconnect 4313 switch, 4313 switch is in the off position, No: 400V 1# unit self-use power bus voltage abnormal alarm;

[0262] Is "4313 switch is in the off position"?

[0263] Yes: 1# unit self-use power a section bus voltage is 0, No: 4313 switch off abnormal alarm, flow exits;

[0264] Is "1# unit self-use power a section bus voltage is 0"?

[0265] Yes: delay 5s, close 4311 switch, 4311 switch is in the on position, No: 400V 1# unit self-use power a section bus voltage abnormal alarm, flow exits;

[0266] Is "4311 switch is in the on position"?

[0267] Yes: 1# unit self-use power a section bus voltage is normal, No: 4311 switch on abnormal alarm, flow exits;

[0268] Is "1# unit self-use power a section bus voltage is normal"?

[0269] Yes: delay 10s, LOOP22, No: 400V 1# unit self-use power a section bus voltage abnormal alarm, flow exits.

[0270] If Figure 12The third part of the 10kV auxiliary power 1st section hot standby transfer operation automatic switching operation sequence control process is shown: 00102 switch and 400V 2nd unit self-use power a section operation part. The specific process is as follows:

[0271] LOOP22:

[0272] Is "00102 switch at remote & 2nd unit self-use power at remote position":

[0273] Yes: close 00102 switch, 00102 switch is in closing position, no: LOOP23;

[0274] Is "00102 switch in closing position":

[0275] Yes: delay 10s, 4322 closing & 4323 closing & 4321 opening, no: 00102 switch closing abnormal alarm, process exits;

[0276] Is "4322 closing & 4323 closing & 4321 opening":

[0277] Yes: 2nd unit self-use power a section & b section voltage is normal, no: 400V 2nd unit self-use power not connected running abnormal alarm, process exits;

[0278] Is "2nd unit self-use power a section & b section voltage is normal":

[0279] Yes: open 4323 switch, 4323 switch is in opening position, no: 400V 2nd unit self-use power bus voltage abnormal alarm;

[0280] Is "4323 switch in opening position":

[0281] Yes: 2nd unit self-use power a section bus voltage is 0, no: 4323 switch opening abnormal alarm, process exits;

[0282] Is "2nd unit self-use power a section bus voltage is 0":

[0283] Yes: delay 5s, close 4321 switch, 4321 switch is in closing position, no: 400V 2nd unit self-use power a section bus voltage abnormal alarm, process exits;

[0284] Is "4321 switch in closing position":

[0285] Yes: 2nd unit self-use power a section bus voltage is normal, no: 4321 switch closing abnormal alarm, process exits;

[0286] Is "2nd unit self-use power a section bus voltage is normal":

[0287] Yes: delay 10s, LOOP23, No: 400V 2nd unit self-use power a-section bus voltage abnormal alarm, flow exits.

[0288] As shown in Figure 13 FIG. 10, it is the fourth part of the sequence control flow of the 10kV plant power 1st standby transfer operation automatic switching operation: 00103 switch and 400V first group public power a-section operation part. The specific flow is as follows:

[0289] LOOP23:

[0290] Is "00103 switch at remote & first group public power at remote"?

[0291] Yes: close 00103 switch, 00103 switch at closing position, No: flow ends;

[0292] Is "00103 switch at closing position"?

[0293] Yes: delay 10s, 4402 closing & 4403 closing & 4401 opening, No: 00103 switch closing abnormal alarm, flow ends;

[0294] Is "4402 closing & 4403 closing & 4401 opening"?

[0295] Yes: first group public power a-section & b-section voltage normal, No: 400V first group public power not connected running abnormal alarm, flow ends;

[0296] Is "first group public power a-section & b-section voltage normal"?

[0297] Yes: open 4403 switch, 4403 switch at opening position, No: 400V first group public power bus voltage abnormal alarm;

[0298] Is "4403 switch at opening position"?

[0299] Yes: first group public power a-section bus voltage is 0, No: 4403 switch opening abnormal alarm, flow ends;

[0300] Is "first group public power a-section bus voltage is 0"?

[0301] Yes: delay 5s, close 4401 switch, 4401 switch at closing position, No: 400V first group public power a-section bus voltage abnormal alarm, flow ends;

[0302] Is "4401 switch at closing position"?

[0303] Yes: first group public power a-section bus voltage normal, No: 4401 switch closing abnormal alarm, flow ends;

[0304] Is the "first group of public power a section bus voltage normal"?

[0305] Yes: the process is over, no: 400V first group of public power a section bus voltage abnormal alarm, the process is over.

[0306] 10kV plant power 1 section hot standby to run automatic switching operation, the specific operation steps are as follows:

[0307] First, check the 10kV plant power 1 section hot standby to run automatic switching operation condition: open the 10kV plant power 1 section hot standby to run automatic switching condition monitoring screen in the computer monitoring system, check the current state of all conditions, if all conditions are displayed as green, it means that the current automatic switching operation condition is met, if one or more conditions are displayed as red, it means that the current automatic switching operation condition is not met, the reason needs to be checked one by one until all conditions are met.

[0308] Second, start the 10kV plant power 1 section hot standby to run automatic switching operation process: when the automatic switching operation condition is met, open the 10kV plant power 1 section hot standby to run automatic switching operation and monitoring screen in the computer monitoring system, check the switching condition state display button is green, click the start instruction button, select the bus charging method in the pop-up window, and start the 10kV plant power 1 section hot standby to run automatic switching operation process after secondary confirmation, at this time the switching state indication box displays "switching process".

[0309] Third, monitor the 10kV plant power 1 section hot standby to run automatic switching operation process execution process: after the automatic switching operation process is started and issued, the 10kV plant power 1 section hot standby to run automatic switching operation and monitoring screen, the current operation item block diagram being executed is displayed in the form of green flashing, the operation item block diagram that has been normally completed is displayed in green, the operation item block diagram that has not been executed is displayed in gray, and the operation item block diagram that has executed abnormally is displayed in red. Figure 7-1 When all operation items in the sequential control process shown in 7-2, 7-3 and 7-4 are executed, the switching state indication box displays "switching success", when the operation item executes abnormally and exits the automatic switching operation process, the switching state indication box displays "switching failure". During the execution of the automatic switching operation process, when the computer monitoring system receives related protection actions or accident signals, the process can be automatically terminated. When the operator considers it necessary to terminate the automatic switching operation process, the operator clicks the reset button in the automatic switching operation and monitoring screen, and terminates the 10kV plant power 1 section hot standby to run automatic switching operation process execution at any time after secondary confirmation.

[0310] The fourth step is to restore the initial state and wait for the next operation: after the automatic switching operation flow of the 10kV plant power 1 section hot standby is normally executed or abnormally exited, the automatic switching operation and monitoring picture is restored to the initial state by clicking the reset button, so as to facilitate the next operation.

[0311] The above merely describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for automatic switching operation of auxiliary power of a hydropower plant, characterized in that, Comprising the following steps: First, check the automatic switching operation condition Check the current state of all automatic switching conditions. If all conditions are green, it means that the current automatic switching operation condition is met. If one or more conditions are red, it means that the current automatic switching operation condition is not met, and the reason needs to be checked one by one until all conditions are met. For the automatic switching operation of the operating thermal standby of the plant power medium voltage bus, the automatic switching operation conditions include: The operated plant power medium voltage bus corresponding LCU is in the remote and non-debug state; Only one of the operating plant power medium voltage bus incoming line and tie-in switch is in the closing position; The operating plant power medium voltage bus incoming line switch is in the open position, or in the closed position and the opening condition is met; The operating plant power medium voltage bus tie-in switch is in the open position, or in the closed position and the opening condition is met; The operating plant power medium voltage bus load switch is in the open position, or in the closed position and the opening condition is met; When the plant power medium voltage bus load switch is in the closed position, the low voltage distribution room supplied by it should be in segmented operation and the low voltage distribution room corresponding bus incoming line switch opening condition is met, or the incoming line switch is in the open position; The generator set powered by the operating plant power medium voltage bus is not in the process of starting or stopping, or in the maintenance state; The automatic switching operation flow of other segments of plant power is not executed; Second, start the automatic switching operation flow When the automatic switching operation condition is met, start the instruction button, and after secondary confirmation, start the automatic switching operation flow; Third, monitor the automatic switching operation flow execution process After the automatic switching operation flow is started, the automatic switching operation and monitoring screen is marked with different colors to indicate the operation status; When all operation items are executed, indicate the operation success or failure information; During the execution of the automatic switching operation flow, if an abnormal protection action or accident signal is received, the flow is automatically terminated; Fourth, restore the initial state and wait for the next operation After the normal execution of the automatic switching operation flow or the abnormal exit of the execution, the automatic switching operation and monitoring screen is restored to the initial state through the reset button, which is convenient for the next operation.

2. The method of claim 1, wherein: In the third step, for the automatic switching operation of the operating thermal standby of the plant power medium voltage bus, the sequential control flow is as follows: Determine whether the first load switch of the plant power medium voltage bus is in the closed position, otherwise determine whether the second load switch of the plant power medium voltage bus is in the closed position, yes, determine whether the low voltage distribution room corresponding bus incoming line switch of the first load switch of the plant power medium voltage bus is in the closed position; Yes, determine whether the a, b segmented operation of the low voltage distribution room is normal, otherwise determine whether the low voltage distribution room corresponding bus incoming line switch of the first load switch of the plant power medium voltage bus is in the open position; Yes, determine whether the a, b segmented bus voltage of the low voltage distribution room is normal, otherwise the operation mode of the low voltage distribution room is not met and an abnormal alarm is given, and exit; Yes, determine whether the low voltage distribution room backup device is in the input position, otherwise the bus voltage of the low voltage distribution room is abnormal and an alarm is given, and exit; Yes, disconnect the low voltage distribution room corresponding bus incoming line switch of the first load switch of the plant power medium voltage bus without blocking the backup automatic switching, and determine whether the incoming line switch is in the open position, otherwise the backup device of the low voltage distribution room is not input and an alarm is given, and exit; Yes, then the low-voltage distribution room a, b section contactor is in the closed position, otherwise, the first load switch of the auxiliary power supply medium voltage bus is abnormal alarm, exit; Yes, then the low-voltage distribution room a, b section contactor is in the closed position, otherwise, the first load switch of the auxiliary power supply medium voltage bus is abnormal alarm, exit; Yes, then the low-voltage distribution room a, b section contactor is in the closed position, otherwise, the first load switch of the auxiliary power supply medium voltage bus is abnormal alarm, exit; Yes, then the low-voltage distribution room a, b section contactor is in the closed position, otherwise, the first load switch of the auxiliary power supply medium voltage bus is abnormal alarm, exit; Yes, then the low-voltage distribution room a, b section contactor is in the closed position, otherwise, the first load switch of the auxiliary power supply medium voltage bus is abnormal alarm, exit; Yes, then the low-voltage distribution room a, b section contactor is in the closed position, otherwise, the first load switch of the auxiliary power supply medium voltage bus is abnormal alarm, exit; Yes, then the low-voltage distribution room a, b section contactor is in the closed position, otherwise, the first load switch of the auxiliary power supply medium voltage bus is abnormal alarm, exit; Yes, then the low-voltage distribution room a, b section contactor is in the closed position, otherwise, the first load switch of the auxiliary power supply medium voltage bus is abnormal alarm, exit; Yes, then the low-voltage distribution room a, b section contactor is in the closed position, otherwise, the first load switch of the auxiliary power supply medium voltage bus is abnormal alarm, exit; Yes, then the low-voltage distribution room a, b section contactor is in the closed position, otherwise, the first load switch of the auxiliary power supply medium voltage bus is abnormal alarm, exit; Yes, then the low-voltage distribution room a, b section contactor is in the closed position, otherwise, the first load switch of the auxiliary power supply medium voltage bus is abnormal alarm, exit; Yes, then the low-voltage distribution room a, b section contactor is in the closed position, otherwise, the first load switch of the auxiliary power supply medium voltage bus is abnormal alarm, exit; Yes, then the low-voltage distribution room a, b section contactor is in the closed position, otherwise, the first load switch of the auxiliary power supply medium voltage bus is abnormal alarm, exit; 3. The method of claim 1, wherein: Yes, then the low-voltage distribution room a, b section contactor is in the closed position, otherwise, the first load switch of the auxiliary power supply medium voltage bus is abnormal alarm, exit. In the first step, for the automatic switching operation of the auxiliary power supply medium voltage bus hot standby, the automatic switching operation conditions include: The operating auxiliary power supply medium voltage bus host computer has been removed; The corresponding LCU of the operating auxiliary power supply medium voltage bus is in the remote and non-debug state; All line switches, contactors and load switches of the operating auxiliary power supply medium voltage bus are in the open position; The operating auxiliary power supply medium voltage bus load switch is in the non-remote position, or the low-voltage distribution room supplied by the medium voltage load switch is in the non-remote position, or the medium voltage load switch is in the closed position, and the low-voltage distribution room corresponding to the bus is supplied by another bus of the distribution room, and the line switch of the low-voltage distribution room corresponding to the bus is in the closed position, and the contactor of the distribution room is in the open position. The operated auxiliary power medium voltage bus protection device is not blocked, not failed and not acted; The operated auxiliary power medium voltage bus switch protection device is not blocked and not acted; The operated auxiliary power medium voltage bus supplied generator is not in the process of starting or stopping, or in the maintenance state; The auxiliary power other section automatic switching operation process is not executed.

4. The method of claim 1, wherein: In the third step, for the auxiliary power medium voltage bus hot standby transfer operation automatic switching operation, the sequential control process is as follows: Determine whether to select the incoming line switch to charge the auxiliary power medium voltage bus, otherwise determine whether to select the tie switch to charge the auxiliary power medium voltage bus, yes, determine whether the auxiliary power medium voltage bus incoming line switch power side voltage is normal; Yes, determine whether the auxiliary power medium voltage bus incoming line switch closing condition is met, otherwise the auxiliary power medium voltage bus incoming line switch power side voltage is abnormal alarm, exit; Yes, determine whether the auxiliary power medium voltage bus voltage is 0, otherwise the auxiliary power medium voltage bus incoming line switch closing condition is abnormal alarm, exit; Yes, close the auxiliary power medium voltage bus incoming line switch, and determine whether the auxiliary power medium voltage bus incoming line switch is in the closing position, otherwise the auxiliary power medium voltage bus voltage is not 0 abnormal alarm, exit; Yes, determine whether the auxiliary power medium voltage bus voltage is normal, otherwise the auxiliary power medium voltage bus incoming line switch closing is abnormal alarm, exit; Yes, delay to determine whether the auxiliary power medium voltage bus first load switch is in the remote position and the low voltage distribution room it supplies is in the remote position, otherwise the auxiliary power medium voltage bus voltage is abnormal alarm after charging, exit; Determine whether to select the tie switch to charge the auxiliary power medium voltage bus, otherwise the auxiliary power medium voltage bus charging switch selection is abnormal alarm and exit, yes, determine whether the medium voltage tie bus voltage is normal; Yes, determine whether the auxiliary power medium voltage bus tie switch is in the closing position, otherwise the medium voltage tie bus voltage is abnormal alarm, exit; Yes, determine whether the auxiliary power medium voltage bus tie switch closing condition is met, otherwise the auxiliary power medium voltage bus tie switch position is abnormal alarm, exit; Yes, determine whether the auxiliary power medium voltage bus voltage is 0, otherwise the auxiliary power medium voltage bus tie switch closing condition is abnormal alarm, exit; Yes, close the auxiliary power medium voltage bus tie switch, and determine whether the auxiliary power medium voltage bus tie switch is in the closing position, otherwise the auxiliary power medium voltage bus voltage is not 0 abnormal alarm, exit; Yes, determine whether the auxiliary power medium voltage bus voltage is normal, otherwise the auxiliary power medium voltage bus tie switch closing is abnormal alarm, exit; Yes, delay to determine whether the auxiliary power medium voltage bus first load switch is in the remote position and the low voltage distribution room it supplies is in the remote position, otherwise the auxiliary power medium voltage bus voltage is abnormal alarm after charging, exit; Yes, close the auxiliary power medium voltage bus first load switch, and determine whether the auxiliary power medium voltage bus first load switch is in the closing position, otherwise determine whether the auxiliary power medium voltage bus second load switch is in the remote position and the low voltage distribution room it supplies is in the remote position; Yes, delay to determine whether the auxiliary power medium voltage bus first load switch supplied low voltage distribution room corresponding bus is supplied by another bus of the distribution room in tie operation, otherwise the auxiliary power medium voltage bus first load switch closing is abnormal alarm, exit; Yes, determine whether the low voltage distribution room a, b section bus voltage is normal, otherwise the low voltage distribution room is not in tie operation abnormal alarm, exit; Yes, then disconnect the low-voltage distribution room contact switch, and determine that the low-voltage distribution room contact switch is in the open position, otherwise, the low-voltage distribution room a and b bus voltage abnormal alarm, exit; Yes, then determine that the first load switch of the plant power medium voltage bus supplies the low-voltage distribution room corresponding bus voltage of 0, otherwise, the low-voltage distribution room contact switch is abnormal alarm, exit; Yes, then delay the first load switch of the plant power medium voltage bus to supply the low-voltage distribution room corresponding bus line switch, and determine that the line switch is in the closed position, otherwise, the first load switch of the plant power medium voltage bus supplies the low-voltage distribution room corresponding bus voltage of 0 abnormal alarm; Yes, then determine that the first load switch of the plant power medium voltage bus supplies the low-voltage distribution room corresponding bus voltage normally, otherwise, the first load switch of the plant power medium voltage bus supplies the low-voltage distribution room corresponding bus line switch closing abnormal alarm, exit; Yes, then delay the first load switch of the plant power medium voltage bus to supply the low-voltage distribution room corresponding bus line switch, and determine that the line switch is in the closed position, otherwise, the first load switch of the plant power medium voltage bus supplies the low-voltage distribution room corresponding bus voltage of 0 abnormal alarm; According to the above power supply operation method of the first load switch of the plant power medium voltage bus and the low-voltage distribution room supplied thereby, the power supply operation of the remaining load switches of the plant power medium voltage bus and the low-voltage distribution rooms supplied thereby is continued, and the process ends.

5. An automatic switching system for house service of a hydropower plant, characterized in that: Suitable for the method of any one of claims 1-4, comprising a preprocessing module, an input module, an output module, a display module and a protection module; The preprocessing module checks the current state of all automatic switching conditions, and if one or more conditions are not met, the processing module checks the reasons one by one and gives corresponding prompts until all conditions are met; When the automatic switching operation condition is met, the input module is started after secondary confirmation to start the automatic switching operation process; After the automatic switching operation process is started, the output module issues various operation instructions for actual device operation, and the display module identifies the device operation state with different colors; When all operation items are executed, the display module indicates operation success or failure information; During the execution of the automatic switching operation process, when an abnormal protection action or accident signal is received, the protection module automatically terminates the process; After the automatic switching operation process is normally executed or abnormally exited, the input module restores the automatic switching operation and monitoring screen to the initial state.

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