A method for automatically processing a speed regulator hydraulic system oil leakage fault

Abstract

An automatic handling method for hydraulic system oil leakage faults in a governor is disclosed. The system involved includes: an electric valve installed on a mechanical pipeline; a guide vane closing check valve and a throttle valve installed on the mechanical pipeline connected to the guide vane servo's control chamber; a switching control valve assembly installed on the mechanical pipeline; and a guide vane position sensor for detecting analog displacement signals of the guide vane servo. The electric valve, switching control valve assembly, and guide vane position sensor are all connected to a PLC controller, which is connected to a human-machine interface device and a monitoring system. Using this system and method, if hydraulic system oil leakage occurs during the operation of the turbine governor's hydraulic system, timely automatic emergency handling can be performed, sealing the leaking pipeline, maintaining the guide vane opening unchanged, and, if necessary, shutting down the turbine and closing the guide vanes. This avoids the problems of slow and inefficient manual handling leading to accident escalation, ensuring the safe operation of the governor's hydraulic system and the unit equipment.

Description

[0001] This is a divisional application for the patent titled "An automatic handling system and method for oil leakage faults in a speed governor hydraulic system" (application number: 2021113715214; application date: 2021.11.18). Technical Field

[0002] This invention relates to the field of automatic control technology for governor hydraulic systems, and specifically to an automatic handling method for oil leakage faults in governor hydraulic systems. Background Technology

[0003] The governor of a hydro-generator unit regulates the unit's load and speed by controlling the opening of the guide vanes. Controlling the guide vane opening requires the power provided by the governor's hydraulic system. Therefore, the safe and stable operation of the governor's hydraulic system plays a crucial role in the power generation control process of the hydro-generator unit. Oil leakage in the governor's hydraulic system during operation can seriously threaten the safe and stable operation of the hydro-generator unit. Currently, there is no perfect automatic fault handling system or method for governor hydraulic system oil leakage. When an oil leakage fault occurs in the hydro-generator governor hydraulic system, timely automatic fault handling is essential to avoid the problems of slow and inefficient manual intervention that could lead to the escalation of the accident. Summary of the Invention

[0004] This invention provides an automatic handling system and method for hydraulic system oil leakage faults in a governor, which can be applied to the operation of a turbine governor hydraulic system. If hydraulic system oil leakage occurs, the system will promptly perform automatic emergency handling, sealing the leaking pipeline and maintaining the guide vane opening unchanged. If necessary, it will shut down the system and close the guide vanes, avoiding the problems of slow and inefficient manual handling that could lead to the escalation of the accident, thus ensuring the safety of the governor hydraulic system and the unit equipment.

[0005] The technical solution adopted in this invention is as follows:

[0006] An automatic handling system for oil leakage faults in a governor hydraulic system, the system comprising:

[0007] An electric valve installed on a mechanical pipeline; the electric valve is used to control the opening and closing of the mechanical pipeline.

[0008] A first throttle valve is installed on the mechanical pipeline connecting the opening control chamber of the first guide vane servo; a second throttle valve is installed on the mechanical pipeline connecting the opening control chamber of the second guide vane servo. The first and second throttle valves are used to limit the oil return speed in the opening control chambers of the first and second guide vane servos when the guide vanes are closed. The first throttle valve is a one-way throttle valve for guide vane closure.

[0009] The switching control valve assembly installed on the mechanical pipeline is used to control the direction of oil flow path in the mechanical pipeline;

[0010] The system also includes a guide vane position sensor for detecting analog displacement signals of the first and second guide vane relays.

[0011] The electric valve, switching control valve group, and guide vane position sensor are all connected to a PLC controller, which is in turn connected to a human-machine interface device and a monitoring system.

[0012] The human-machine interface device displays the real-time operating status information of the speed controller hydraulic system and the switch status of each electric valve output by the PLC controller. It also transmits the user's shutdown and guide vane closing commands and manual reset commands for oil leakage faults to the PLC controller via communication.

[0013] The PLC controller collects stop and guide vane closing commands from the monitoring system or human-machine interface device, manual reset commands for oil leakage faults, status signals of the hydraulic system, and analog displacement signals (which can be converted into guide vane opening signals) of the first and second guide vane relays sent by the guide vane position sensors. It monitors the oil leakage of the governor hydraulic system and performs fault handling when an oil leakage fault is diagnosed in the governor hydraulic system to prevent the accident from escalating.

[0014] The status signals of the aforementioned hydraulic system include whether the hydraulic system isolation valve is closed. If the isolation valve is closed, the governor hydraulic system is in a stopped state; if the isolation valve is open, the governor hydraulic system is in a running state. The monitoring system can collect the running status of the governor hydraulic system and the on / off status information of each electric valve output by the PLC controller in real time, and issue a stop and guide vane closing command and a manual reset command for oil leakage fault to the PLC controller.

[0015] The first guide vane servo and the second guide vane servo are installed next to the turbine servo ring in the water turbine chamber. The control chambers at both ends of the first guide vane servo and the second guide vane servo are respectively connected to mechanical pipelines. By controlling the pressure at both ends of the control chambers of the first guide vane servo and the second guide vane servo, the operation of the first guide vane servo and the second guide vane servo is controlled, thereby controlling the operation of the turbine servo ring and the turbine guide vanes.

[0016] When the control chamber of the first guide vane servo and the second guide vane servo are opened and pressurized oil is supplied, and the control chamber is closed and unpressurized return oil is supplied, the guide vane opening increases; when the control chamber of the guide vane servo is closed and pressurized oil is supplied, and the control chamber is opened and unpressurized return oil is supplied, the guide vane opening decreases.

[0017] The electric valve is installed on the mechanical pipeline, receives the switching control command from the PLC controller, and sends the electric valve switching status feedback signal to the PLC controller.

[0018] The mechanical pipeline includes a pressurized oil delivery pipeline and an unpressurized oil return pipeline.

[0019] The first pipeline unit is connected at both ends to the opening control chamber O of the first throttle valve and the first guide vane servo, respectively.

[0020] The two ends of the second pipeline unit are respectively connected to the opening control chamber O of the first throttle valve and the second guide vane servo;

[0021] The third pipeline unit is connected to the first throttle valve and the switching control valve group at both ends, respectively.

[0022] The fourth pipeline unit is connected at both ends to the closing control chamber C of the first guide vane servo and the switching control valve group, respectively.

[0023] The fifth pipeline unit is connected at both ends to the closing control chamber C of the second guide vane servo and the switching control valve group, respectively;

[0024] The sixth pipeline unit is connected at both ends to the opening control chamber O of the first guide vane servo and the second throttle valve, respectively.

[0025] The seventh pipeline unit is connected at both ends to the opening control chamber O of the second guide vane servo and the second throttle valve, respectively;

[0026] The eighth pipeline unit is connected to the second throttle valve and the return oil tank at both ends, respectively;

[0027] The ninth pipeline unit is connected at both ends to the control chamber C of the first guide vane servo and the pressure oil tank, respectively;

[0028] The tenth pipeline unit is connected at both ends to the control chamber C of the second guide vane servo and the pressure oil tank, respectively.

[0029] The system also includes electrical circuits, which include a valve switching control signal circuit output by the PLC controller to the electric valve and a valve switching status feedback signal circuit sent by the electric valve to the PLC controller.

[0030] The return oil tank is a container for storing unpressurized oil in the governor's hydraulic system, and provides a pressurized oil source for the hydraulic system.

[0031] The pressure oil tank is a container for storing pressurized oil in the governor's hydraulic system, providing a source of pressurized oil for the hydraulic system.

[0032] An automatic handling method for oil leakage faults in a governor hydraulic system includes the following steps:

[0033] Step 1: The PLC controller collects in real time the shutdown and guide vane closing commands, the manual reset commands for oil leakage faults, the relay displacement signals, and the status signals of the hydraulic system.

[0034] Step 2: The PLC controller detects the status of the hydraulic system. If the hydraulic system is running, proceed to Step 3; otherwise, return to Step 1.

[0035] Step 3: The PLC controller diagnoses whether there is an oil leakage fault in the hydraulic system of the speed controller. If no oil leakage fault occurs, open the electric valves M1, M2, M3, M4, M9, and M10, close the electric valves M5, M6, M7, and M8, and return to Step 1; otherwise, close the electric valves M1, M2, M3, M4, M9, and M10, and proceed to Step 4.

[0036] Step 4: The PLC controller re-diagnoses whether there is an oil leakage fault in the speed controller hydraulic system. If an oil leakage fault is still diagnosed, open the electric valves M5, M6, M7, and M8, and proceed to Step 5; otherwise, proceed to Step 7.

[0037] Step 5: The PLC controller detects the displacement signal of the relay. If the displacement signal of the relay (or the opening of the guide vane) remains unchanged, or the guide vane is fully closed, then the electric valves M5, M6, M7, M8, and M11 are closed, and the process proceeds to step 6.

[0038] Step 6: The PLC controller checks whether it has received a manual reset command for the oil leak fault. If it has received a manual reset command for the oil leak fault from the monitoring system or the human-machine interface device, it returns to Step 1.

[0039] Step 7: The PLC controller checks whether it has received a stop and guide vane closing command. If it receives a stop and guide vane closing command from the monitoring system or human-machine interface device, it opens electric valves M5, M6, M7, and M8, and proceeds to step 8.

[0040] Step 8: The PLC controller checks whether it has received a manual reset command for the oil leak fault. If it has received the command, it returns to Step 1; otherwise, it returns to Step 4.

[0041] The present invention provides an automatic handling system and method for oil leakage faults in the hydraulic system of a governor. When the hydraulic system of the governor of a water turbine is running, if an oil leakage problem occurs, the system can automatically handle the fault in a timely manner, close the leaking pipeline, keep the guide vane opening unchanged, and shut down the guide vane when necessary. This avoids the problems of slow speed and low efficiency of manual handling, which may lead to the expansion of the accident, and ensures the safe operation of the governor hydraulic system and the unit equipment. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the automatic handling system for oil leakage faults in the hydraulic system of the speed governor of the present invention.

[0043] Figure 1 The midline type is represented as follows:

[0044]

[0045] Figure 2This is a flowchart of the automatic handling method for oil leakage faults in the hydraulic system of the speed governor according to the present invention.

[0046] Figure 3 This is a structural diagram of the switching control valve group.

[0047] Figure 4 This is a structural diagram of the hydraulic system leakage monitoring system for the speed governor.

[0048] Figure 5 This is a flowchart of the method for monitoring oil leakage in the hydraulic system of a speed governor.

[0049] The components are: 1-Human-machine interface device, 2-PLC controller, 3-First throttle valve, 4A-First guide vane relay, 4B-Second guide vane relay, 5-Electric valve, 6-Mechanical pipeline, 7-Electrical circuit, 8-Switching control valve group, 9-Return oil tank, 9A-Return oil tank level gauge, 10-Pressure oil tank, 10A-Pressure oil tank level gauge, 11-Turbine relay ring, 12-Monitoring system, 13-Guide vane position sensor, 14-Second throttle valve. Detailed Implementation

[0050] like Figure 1 As shown, an automatic handling system for oil leakage faults in a governor hydraulic system includes:

[0051] An electric valve 5 is installed on the mechanical pipeline 6. The electric valve 5 is used to control the on / off state of the mechanical pipeline 6.

[0052] A first throttle valve 3 is installed on the mechanical pipeline connected to the open control chamber of the first guide vane servo 4A; a second throttle valve 14 is installed on the mechanical pipeline connected to the open control chamber of the second guide vane servo 4B. The first throttle valve 3 and the second throttle valve 14 are used to limit the oil return speed in the open control chambers of the first guide vane servo 4A and the second guide vane servo 4B when the guide vanes are closed. The first throttle valve 3 is a one-way throttle valve for guide vane closure.

[0053] The switching control valve group 8, which is installed on the mechanical pipeline 6, is used to control the direction of oil flow path in the mechanical pipeline 6;

[0054] The system also includes a guide vane position sensor 13, used to detect the analog displacement signal of the guide vane relay;

[0055] The electric valve 5, the switching control valve group 8, and the guide vane position sensor 13 are all connected to the PLC controller 2, which is connected to the human-machine interaction device 1 and the monitoring system 12.

[0056] The switching control valve group 8 is a combination of a three-position five-way hydraulically controlled main pressure regulating valve and a proportional valve. It receives current control signals from the PLC controller 2 to control the valve core position of the proportional valve, thereby controlling the hydraulic pressure of the main pressure regulating valve, which in turn controls the valve core position of the main pressure regulating valve, ultimately controlling the interconnection of the four mechanical pipelines leading to the main pressure regulating valve. See the structural diagram of the switching control valve group 8. Figure 3 The 200DR is the main pressure regulating valve, and the 101EB is the proportional valve.

[0057] The guide vane position sensor 13 is installed on the first guide vane servo 4A and the second guide vane servo 4B to detect and output analog displacement signals of the first guide vane servo 4A and the second guide vane servo 4B.

[0058] The human-machine interface device 1 displays the real-time operating status information of the speed governor hydraulic system output by the PLC controller 2 and the on / off status of each electric valve 5, and transmits the user's shutdown and guide vane closing commands and manual reset commands for oil leakage faults to the PLC controller 2 via communication.

[0059] The PLC controller 2 collects the stop and guide vane closing commands issued by the monitoring system 12 or the human-machine interface device 1, the manual reset command for oil leakage faults, and the displacement analog signal (which can be converted into a guide vane opening signal) of the first guide vane relay 4A sent by the guide vane position sensor 13. The first guide vane relay 4A and the second guide vane relay 4B operate synchronously; therefore, the guide vane position sensor 13 can also be designed to measure the displacement analog signal of the second guide vane relay 4B. The governor hydraulic system oil leakage monitoring system monitors the oil leakage of the governor hydraulic system. When an oil leakage fault is diagnosed in the governor hydraulic system, the fault is handled according to the automatic oil leakage fault handling method of the governor hydraulic system of this invention to prevent the accident from escalating.

[0060] PLC controller 2 uses a Schneider brand PLC controller with model number 140CPU67160.

[0061] The monitoring system 12 uses the H9000 model manufactured by Zhongshui Technology.

[0062] The overall monitoring system of a hydropower station is divided into two hierarchical levels: the plant level and the local control unit level. The local control unit level connects to the power station control network and uses fieldbus technology to perform local monitoring tasks for designated equipment. In this invention, the monitoring system specifically refers to the local control unit level, which is distributed according to the controlled object units and consists of all local control units (LCUs) throughout the plant, including the LCUs for each generating unit, the plant auxiliary power LCU, the public utility LCU, the switchyard LCU, and the dam crest LCU. Each local control unit (LCU) includes a PLC, touch screen, network equipment, cabinets, etc., and is responsible for equipment (including governor hydraulic system equipment) data acquisition and processing, equipment status monitoring and process monitoring, equipment control and regulation, and equipment information communication.

[0063] The monitoring system 12 can collect real-time information on the operating status of the governor hydraulic system and the switching status of each electric valve 5 from the PLC controller 2, and send commands to the PLC controller 2 to stop the guide vanes and manually reset the oil leakage fault. The first guide vane servo 4A and the second guide vane servo 4B are installed next to the turbine servo ring 11 in the water turbine chamber. The control chambers at both ends of the first guide vane servo 4A and the second guide vane servo 4B are respectively connected to the mechanical pipeline 6. By controlling the pressure at both ends of the control chambers of the first guide vane servo 4A and the second guide vane servo 4B, the operation of the first guide vane servo 4A and the second guide vane servo 4B is controlled, thereby controlling the operation of the turbine servo ring 11 and the turbine guide vanes.

[0064] When the opening control chamber of the first guide vane servo 4A and the second guide vane servo 4B is circulated with pressurized oil and the closing control chamber is circulated with unpressurized return oil, the guide vane opening increases; when the closing control chamber of the guide vane servo 4B is circulated with pressurized oil and the opening control chamber is circulated with unpressurized return oil, the guide vane opening decreases.

[0065] The electric valve 5 is installed on the mechanical pipeline 6, receives the switching control command from the PLC controller 2, and sends the electric valve switching status feedback signal to the PLC controller 2.

[0066] Electric valve 5 typically uses electric ball valves, including 11 electric valves in total, from M1 to M11. M1 is installed on the mechanical pipeline connecting the closing control chamber of the first guide vane servo 4A and the switching control valve group 8; M2 is installed on the mechanical pipeline connecting the opening control chamber of the first guide vane servo 4A and the first throttle valve 3; M3 is installed on the mechanical pipeline connecting the opening control chamber of the second guide vane servo 4B and the first throttle valve 3; M4 is installed on the mechanical pipeline connecting the closing control chamber of the second guide vane servo 4B and the switching control valve group 8; M5 is installed on the mechanical pipeline connecting the closing control chamber of the first guide vane servo 4A and the common point D of the mechanical pipeline; M6 is installed on the mechanical pipeline connecting the opening control chamber of the first guide vane servo 4A... M7 is installed on the mechanical pipeline connecting the control chamber and the second throttle valve 14 of the second guide vane servo 4B; M8 is installed on the mechanical pipeline connecting the control chamber of the second guide vane servo 4B and the common point D of the mechanical pipeline; M9 is installed on the common mechanical pipeline connecting the switching control valve group 8 and the second throttle valve 14, the switching control valve group 8 and the return oil tank 9; M10 is installed on the mechanical pipeline connecting the switching control valve group 8 and the common point D of the mechanical pipeline; M11 is installed on the mechanical pipeline connecting the pressure oil tank 10 and the common point D of the mechanical pipeline.

[0067] The mechanical pipeline 6 includes a pressurized oil supply pipeline and an unpressurized oil return pipeline.

[0068] The system also includes an electrical circuit 7, which includes a valve control signal circuit from the PLC controller 2 to the electric valve 5 and a valve status feedback signal circuit from the electric valve 5 to the PLC controller 2.

[0069] The return oil tank 9 is a container for storing unpressurized oil in the governor hydraulic system, and provides a pressurized oil source for the hydraulic system.

[0070] The pressure oil tank 10 is a container for storing pressure oil in the governor hydraulic system, providing a pressure oil source for the hydraulic system.

[0071] The structure diagram of the governor hydraulic system oil leakage monitoring system is as follows: Figure 4 As shown, the hydraulic system leakage monitoring system of the speed controller includes: pressure oil tank 10, return oil tank 9, pressure oil tank level gauge 10A, return oil tank level gauge 9A, PLC controller 2, human-machine interaction device 1, and monitoring system 12.

[0072] Pressure oil tank 10 is used to provide a pressure oil source for the hydraulic system;

[0073] Return oil tank 9 is used to collect unpressurized return oil from the hydraulic system.

[0074] The pressure oil tank 10 is equipped with a pressure oil tank level gauge 10A, which is used to measure the level of the pressure oil in the pressure oil tank 10;

[0075] The return oil tank 9 is equipped with a return oil tank level gauge 9A, which is used to measure the level of unpressurized oil in the return oil tank 9;

[0076] The oil level gauge 10A in the pressure tank and the oil level gauge 9A in the return tank are connected to the PLC controller 2. The PLC controller 2 is connected to the human-machine interface device 1 and the monitoring system 12, respectively.

[0077] The PLC controller 2 collects the level signals of the pressure tank 10 and the return tank 9 measured by the pressure tank level gauge 10A and the return tank level gauge 9A, as well as the status information of the hydraulic system. After data processing and calculation, it outputs the hydraulic system oil leakage amount and hydraulic system oil leakage fault alarm information to the human-machine interaction device 1 and the monitoring system 12.

[0078] The status information of the hydraulic system includes whether the hydraulic system isolation valve is closed. If the isolation valve is closed, the governor hydraulic system is in a stopped state; if the isolation valve is open, the governor hydraulic system is in a running state.

[0079] The human-machine interface device 1 displays the hydraulic system oil leakage amount and hydraulic system oil leakage fault alarm information output by the PLC controller 2 in real time, and sets the hydraulic system oil leakage criterion threshold V set by the user for the speed governor. 阈值 The data is transmitted to PLC controller 2 via communication.

[0080] like Figure 5 As shown, the method for monitoring oil leakage in the governor hydraulic system includes the following steps:

[0081] Step 1): Initialization, real-time acquisition of the liquid level signal h1 of the pressure oil tank 10 and the liquid level signal h2 of the return oil tank 9, the status information of the hydraulic system, and the user-set hydraulic system oil leakage threshold V output by the human-machine interaction device 1. 阈值 .

[0082] Step 2): When the governor hydraulic system is in operation, calculate the initial value V of the governor hydraulic system oil volume. 初始 V 初始 =h1 o *S1+h2 o *S2;

[0083] Among them: when the governor hydraulic system is in operation, h1 o h2 represents the initial liquid level of the hydraulic oil tank 10 in the governor's hydraulic system. o S1 represents the initial liquid level of the return oil tank 9 in the governor's hydraulic system. S2 represents the cross-sectional area of ​​the pressure oil tank 10 in the governor's hydraulic system and S2 represents the cross-sectional area of ​​the return oil tank 9 in the governor's hydraulic system.

[0084] Step 3): When the governor hydraulic system is in operation, calculate the real-time oil volume value V of the governor hydraulic system; V = V1 n +V2 n =h1 n *S1+h2 n *S2

[0085] Among them: when the governor hydraulic system is in operation, V1 n V2 is the volume of oil in the hydraulic tank 10 of the governor's hydraulic system. n h1 represents the volume of oil in the return oil tank 9 of the governor hydraulic system. n h2 represents the real-time liquid level in the pressurized oil tank. n S1 represents the real-time oil level in the return oil tank, S2 represents the cross-sectional area of ​​the pressure oil tank in the governor hydraulic system, and S3 represents the cross-sectional area of ​​the return oil tank in the governor hydraulic system.

[0086] Step 4): Calculate the real-time oil leakage V of the governor hydraulic system. 漏 =|VV 初始 |

[0087] Step 5): When V 漏 >V 阈值 At that time, the governor's hydraulic system will trigger an oil leakage alarm.

[0088] Step 6): Output speed controller hydraulic system oil leakage V 漏 And hydraulic system oil leakage alarm information.

[0089] An automatic handling method for oil leakage faults in a governor hydraulic system, such as... Figure 2 As shown, it includes the following steps:

[0090] Step 1: PLC controller 2 collects in real time the shutdown and guide vane closing commands, the manual reset commands for oil leakage faults, the relay displacement signals, and the status signals of the hydraulic system.

[0091] Step 2: PLC controller 2 detects the status of the hydraulic system. If the hydraulic system is running, proceed to step 3; otherwise, return to step 1.

[0092] Step 3: PLC controller 2 diagnoses whether there is an oil leakage fault in the hydraulic system of the speed controller. If no oil leakage fault occurs, open electric valves M1, M2, M3, M4, M9, and M10, close electric valves M5, M6, M7, and M8, and return to step 1; otherwise, close electric valves M1, M2, M3, M4, M9, and M10, and proceed to step 4.

[0093] Step 4: PLC controller 2 re-diagnoses whether there is an oil leakage fault in the speed controller hydraulic system. If an oil leakage fault is still diagnosed, open electric valves M5, M6, M7, and M8, and proceed to step 5; otherwise, proceed to step 7.

[0094] Step 5: PLC controller 2 detects the displacement signal of the relay. If the displacement signal of the relay (or the opening of the guide vane) remains unchanged, or the guide vane is fully closed, then the electric valves M5, M6, M7, M8, and M11 are closed, and the process proceeds to step 6.

[0095] Step 6: PLC controller 2 checks whether it has received a manual reset command for the oil leak fault. If it receives a manual reset command for the oil leak fault from monitoring system 12 or human-machine interface device 1, it returns to step 1.

[0096] Step 7: PLC controller 2 checks whether it has received a stop and guide vane closing command. If it receives a stop and guide vane closing command from monitoring system 12 or human-machine interface device 1, it opens electric valves M5, M6, M7, and M8 and proceeds to step 8.

[0097] Step 8: PLC controller 2 checks whether it has received a manual reset command for the oil leak fault. If it has received the command, it returns to step 1; otherwise, it returns to step 4.

Claims

1. An automatic handling method for oil leakage faults in a governor hydraulic system, characterized in that, Includes the following steps: Step 1: The PLC controller (2) collects in real time the shutdown guide vane command, the manual reset command for oil leakage fault, the relay displacement signal, and the status signal of the hydraulic system; Step 2: The PLC controller (2) detects the status of the hydraulic system. If the hydraulic system is in operation, proceed to step 3; otherwise, return to step 1. Step 3: The PLC controller (2) diagnoses whether there is an oil leakage fault in the hydraulic system of the speed controller. If there is no oil leakage fault, open the electric valves M1, M2, M3, M4, M9, and M10, close the electric valves M5, M6, M7, and M8, and return to step 1; otherwise, close the electric valves M1, M2, M3, M4, M9, and M10, and proceed to step 4. Step 4: PLC controller (2) re-diagnoses whether there is an oil leakage fault in the hydraulic system of the speed controller; if it is still diagnosed as an oil leakage fault, open the electric valves M5, M6, M7, and M8 and proceed to step 5; otherwise, proceed to step 7. Step 5: The PLC controller (2) detects the displacement signal of the relay. If the displacement signal of the relay or the opening of the guide vane remains unchanged, or the guide vane is fully closed, then the electric valves M5, M6, M7, M8, and M11 are closed, and the process proceeds to step 6. Step 6: The PLC controller (2) checks whether it has received a manual reset command for the oil leak fault. If it has received a manual reset command for the oil leak fault from the monitoring system (12) or the human-machine interaction device (1), it returns to step 1. Step 7: The PLC controller (2) checks whether it has received a stop and guide vane closing command. If it receives a stop and guide vane closing command from the monitoring system (12) or the human-machine interaction device (1), it opens the electric valves M5, M6, M7, and M8 and proceeds to step 8. Step 8: The PLC controller (2) checks whether it has received a manual reset command for the oil leak fault. If it has received a manual reset command for the oil leak fault, it returns to step 1; otherwise, it returns to step 4. The M1 electric valve is installed on the mechanical pipeline connecting the closing control chamber of the first guide vane servo (4A) and the switching control valve group (8); the M2 electric valve is installed on the mechanical pipeline connecting the opening control chamber of the first guide vane servo (4A) and the first throttle valve (3); The M3 electric valve is installed on the mechanical pipeline connecting the control chamber of the second guide vane servo (4B) and the first throttle valve (3); The M4 electric valve is installed on the mechanical pipeline connecting the control chamber of the second guide vane servo (4B) and the switching control valve group (8); The M5 electric valve is installed on the mechanical pipeline connecting the control chamber of the first guide vane servo (4A) and the common point (D) of the mechanical pipeline; The M6 ​​electric valve is installed on the mechanical pipeline connecting the control chamber of the first guide vane servo (4A) and the second throttle valve (14); The M7 electric valve is installed on the mechanical pipeline connecting the control chamber of the second guide vane servo (4B) and the second throttle valve (14); The M8 electric valve is installed on the mechanical pipeline connecting the control chamber of the second guide vane servo (4B) and the common point (D) of the mechanical pipeline; The M9 electric valve is installed on the common mechanical pipeline connecting the switching control valve group (8) and the second throttle valve (14), the switching control valve group (8) and the return oil tank (9); The M10 electric valve is installed on the mechanical line connecting the switching control valve group (8) and the common point (D) of the mechanical line; The M11 electric valve is installed on the mechanical pipeline connecting the pressure tank (10) and the common point (D) of the mechanical pipeline.

2. The automatic handling method for oil leakage faults in a governor hydraulic system according to claim 1, characterized in that: The method includes an automatic handling system for oil leakage faults in a governor hydraulic system, the system comprising: An electric valve (5) is installed on the mechanical pipeline (6) to control the opening and closing of the mechanical pipeline (6); A first throttle valve (3) is installed on the mechanical pipeline connected to the control chamber of the first guide vane servo (4A); a second throttle valve (14) is installed on the mechanical pipeline connected to the control chamber of the second guide vane servo (4B); the first throttle valve and the second throttle valve are used to limit the oil return speed in the control chambers of the first guide vane servo (4A) and the second guide vane servo (4B) when the guide vanes are closed; A switching control valve group (8) is installed on the mechanical pipeline (6) to control the direction of oil flow path in the mechanical pipeline (6); The system also includes a guide vane position sensor (13) for detecting analog displacement signals of the first guide vane relay (4A) and the second guide vane relay (4B); The electric valve (5), the switching control valve group (8), and the guide vane position sensor (13) are all connected to the PLC controller (2), and the PLC controller (2) is connected to the human-machine interaction device (1) and the monitoring system (12) respectively.

3. The automatic handling method for oil leakage faults in a governor hydraulic system according to claim 2, characterized in that: The human-machine interaction device (1) displays the operating status information of the speed regulator hydraulic system output by the PLC controller (2) and the switching status of each electric valve (5) in real time, and transmits the user's shutdown guide vane command and oil leakage fault manual reset command to the PLC controller (2) through communication.

4. The automatic handling method for oil leakage faults in a governor hydraulic system according to claim 2, characterized in that: The PLC controller (2) collects the stop and guide vane closing command issued by the monitoring system (12) or the human-machine interaction device (1), the manual reset command for oil leakage fault, the status signal of the hydraulic system, and the displacement analog signal of the first guide vane relay (4A) and the second guide vane relay (4B) transmitted on the guide vane position sensor (13) to monitor the oil leakage of the speed governor hydraulic system.

5. The automatic handling method for oil leakage fault in a governor hydraulic system according to claim 2, characterized in that: The monitoring system (12) collects the operating status of the speed regulator hydraulic system and the switching status information of each electric valve (5) output by the PLC controller (2) in real time, and sends a stop and guide vane closing command and an oil leakage fault manual reset command to the PLC controller (2).

6. The automatic handling method for oil leakage fault in a governor hydraulic system according to claim 2, characterized in that: The first guide vane relay (4A) and the second guide vane relay (4B) are installed next to the turbine relay ring (11) in the water turbine chamber. The control chambers at both ends of the first guide vane relay (4A) and the second guide vane relay (4B) are respectively connected to mechanical pipelines (6). By controlling the pressure of the control chambers at both ends of the first guide vane relay (4A) and the second guide vane relay (4B), the action of the first guide vane relay (4A) and the second guide vane relay (4B) is controlled, thereby controlling the action of the turbine relay ring (11) and the action of the turbine guide vanes.

7. The automatic handling method for oil leakage fault in a governor hydraulic system according to claim 2, characterized in that: The electric valve (5) is installed on the mechanical pipeline (6), receives the switch control command from the PLC controller (2), and sends the electric valve switch status feedback signal to the PLC controller (2).

8. The automatic handling method for oil leakage fault in a governor hydraulic system according to claim 2, characterized in that: Mechanical piping (6) includes the first to tenth piping units; The first pipeline unit is connected at both ends to the opening control chamber O of the first throttle valve (3) and the first guide vane servo (4A); The two ends of the second pipeline unit are respectively connected to the opening control chamber O of the first throttle valve (3) and the second guide vane servo (4B); The first throttle valve (3) and the switching control valve group (8) are connected to the two ends of the third pipeline unit, respectively. The four pipeline unit is connected at both ends to the control chamber C of the first guide vane relay (4A) and the switching control valve group (8); The fifth pipeline unit is connected at both ends to the control chamber C of the second guide vane servo (4B) and the switching control valve group (8). The six pipeline unit is connected at both ends to the opening control chamber O of the first guide vane servo (4A) and the second throttle valve (14); The seventh pipeline unit is connected at both ends to the opening control chamber O of the second guide vane servo (4B) and the second throttle valve (14). The second throttle valve (14) and the return oil tank (9) are connected to the two ends of the eighth pipeline unit, respectively. The ninth pipeline unit is connected at both ends to the control chamber C of the first guide vane relay (4A) and the pressure oil tank (10). The two ends of the tenth pipeline unit are respectively connected to the control chamber C of the second guide vane relay (4B) and the pressure oil tank (10).

9. The automatic handling method for oil leakage fault in a governor hydraulic system according to claim 2, characterized in that: The system also includes an electrical circuit (7), which includes a valve control signal circuit output by the PLC controller (2) to the electric valve (5) and a valve status feedback signal circuit sent by the electric valve (5) to the PLC controller (2).

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