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CN-117072518-B - Automatic processing method for oil leakage fault of hydraulic system of speed regulator

CN117072518BCN 117072518 BCN117072518 BCN 117072518BCN-117072518-B

Abstract

The automatic processing method of the oil leakage fault of the hydraulic system of the speed regulator comprises an electric valve arranged on a mechanical pipeline, a guide vane closed one-way throttle valve and a throttle valve arranged on the mechanical pipeline connected with an opening control cavity of a guide vane servomotor, a switching control valve group arranged on the mechanical pipeline, and a guide vane position sensor used for detecting a displacement analog signal of the guide vane servomotor. The electric valve, the switching control valve group and the guide vane position sensor are all connected with a PLC controller, and the PLC controller is respectively connected with the man-machine interaction device and the monitoring system. By adopting the system and the method, when the hydraulic system of the hydraulic turbine speed regulator operates, if the problem of oil leakage of the hydraulic system occurs, the automatic emergency treatment of faults can be performed in time, a leakage pipeline is closed, the opening degree of the guide vane is kept unchanged, the stop and guide vane closing operation is performed when necessary, the problems of accident expansion and the like caused by slow manual treatment speed and low efficiency are avoided, and the operation safety of the hydraulic system of the speed regulator and unit equipment is ensured.

Inventors

  • TU YONG

Assignees

  • 中国长江电力股份有限公司

Dates

Publication Date
20260505
Application Date
20211118

Claims (9)

  1. 1. The automatic processing method for the oil leakage fault of the hydraulic system of the speed regulator is characterized by comprising the following steps of: Step 1, a PLC (2) collects a stop guide vane command, an oil leakage fault manual resetting command, a servomotor displacement signal and a state signal of a hydraulic system in real time; Step 2, the PLC (2) detects the state of the hydraulic system, if the hydraulic system is in an operating state, the step 3 is entered, otherwise, the step 1 is returned; Step 3, a PLC (2) diagnoses whether an oil leakage fault exists in a hydraulic system of the speed regulator, if the oil leakage fault does not exist, the motor valves of M1, M2, M3, M4, M9 and M10 are opened, the motor valves of M5, M6, M7 and M8 are closed, the step 1 is returned, otherwise, the motor valves of M1, M2, M3, M4, M9 and M10 are closed, and the step 4 is entered; step 4, the PLC (2) re-diagnoses whether the oil leakage fault occurs in the hydraulic system of the speed regulator, if the oil leakage fault is still diagnosed, the M5, M6, M7 and M8 electric valves are opened to enter the step 5, otherwise, the step 7 is entered; step 5, detecting a servomotor displacement signal by the PLC (2), and if the servomotor displacement signal or the opening degree of the guide vane is kept unchanged or the guide vane is fully closed, closing the M5, M6, M7, M8 and M11 electric valves, and entering the step 6; Step 6, the PLC (2) detects whether an oil leakage fault manual resetting instruction is received, and if the oil leakage fault manual resetting instruction sent by the monitoring system (12) or the man-machine interaction device (1) is received, the step 1 is returned; Step 7, the PLC (2) detects whether a command for closing the guide vanes is received, if the command for closing the guide vanes is received, which is sent by the monitoring system (12) or the man-machine interaction device (1), the M5, M6, M7 and M8 electric valves are opened, and the step 8 is entered; step 8, the PLC (2) detects whether an oil leakage fault manual resetting instruction is received, if so, the step 1 is returned, otherwise, the step 4 is returned; the M1 electric valve is arranged on a mechanical pipeline connecting the first guide vane servomotor (4A) closing control cavity and the switching control valve group (8), and the M2 electric valve is arranged on a mechanical pipeline connecting the first guide vane servomotor (4A) opening control cavity and the first throttle valve (3); the M3 electric valve is arranged on a mechanical pipeline which is connected with the second guide vane servomotor (4B) opening control cavity and the first throttle valve (3); the M4 electric valve is arranged on a mechanical pipeline which is connected with the closing control cavity of the second guide vane servomotor (4B) and the switching control valve group (8); The M5 electric valve is arranged on a mechanical pipeline which is connected with a common point (D) of a closing control cavity and a mechanical pipeline of the first guide vane servomotor (4A); The M6 electric valve is arranged on a mechanical pipeline which is connected with the first guide vane servomotor (4A) opening control cavity and the second throttle valve (14); the M7 electric valve is arranged on a mechanical pipeline which is connected with the second guide vane servomotor (4B) opening control cavity and the second throttle valve (14); The M8 electric valve is arranged on a mechanical pipeline which is connected with a common point (D) of a closing control cavity and a mechanical pipeline of the second guide vane servomotor (4B); The M9 electric valve is arranged on a common mechanical pipeline for connecting the switching control valve group (8) with the second throttle valve (14), the switching control valve group (8) and the oil return tank (9); the M10 electric valve is arranged on a mechanical pipeline which is connected with the switching control valve group (8) and a common point (D) of the mechanical pipeline; The M11 electric valve is arranged on a mechanical pipeline which connects the pressure oil tank (10) and a common point (D) of the mechanical pipeline.
  2. 2. The automatic oil leakage fault processing method of the hydraulic system of the speed regulator according to claim 1, wherein the method comprises an automatic oil leakage fault processing system of the hydraulic system of the speed regulator, and the system comprises the following steps: the electric valve (5) is arranged on the mechanical pipeline (6), and the electric valve (5) is used for controlling the on-off of the mechanical pipeline (6); The hydraulic control system comprises a first throttle valve (3) arranged on a mechanical pipeline connected with a control cavity of a first guide vane servomotor (4A), a second throttle valve (14) arranged on a mechanical pipeline connected with a control cavity of a second guide vane servomotor (4B), and a control cavity oil backflow speed limited by the first guide vane servomotor (4A) and the second guide vane servomotor (4B) when the first throttle valve and the second throttle valve are used for closing guide vanes; the switching control valve group (8) is arranged on the mechanical pipeline (6) and is used for controlling the direction of the oil flow path in the mechanical pipeline (6); The system also comprises a guide vane position sensor (13) for detecting displacement analog quantity signals of the first guide vane servomotor (4A) and the second guide vane servomotor (4B); The electric valve (5), the switching control valve group (8) and the guide vane position sensor (13) are all connected with the PLC (2), and the PLC (2) is respectively connected with the man-machine interaction device (1) and the monitoring system (12).
  3. 3. The automatic processing method for oil leakage faults of a hydraulic system of a speed regulator according to claim 2 is characterized in that: The man-machine interaction device (1) displays the operation state information picture of the speed regulator hydraulic system and the switching state of each electric valve (5) output by the PLC (2) in real time, and transmits a stop guide vane closing instruction and an oil leakage fault manual resetting instruction of a user to the PLC (2) in a communication mode.
  4. 4. The automatic processing method for oil leakage faults of a hydraulic system of a speed regulator according to claim 2 is characterized in that: The PLC (2) collects a stop guide vane closing command sent by the monitoring system (12) or the man-machine interaction device (1), an oil leakage fault manual reset command, a state signal of the hydraulic system and displacement analog quantity signals of the first guide vane servomotor (4A) and the second guide vane servomotor (4B) which are conveyed on the guide vane position sensor (13), and monitors oil leakage of the hydraulic system of the speed regulator.
  5. 5. The automatic processing method for oil leakage faults of a hydraulic system of a speed regulator according to claim 2 is characterized in that: The monitoring system (12) collects the running state of the speed regulator hydraulic system and the on-off state information of each electric valve (5) output by the PLC (2) in real time, and sends a shutdown guide vane closing instruction and an oil leakage fault manual resetting instruction to the PLC (2).
  6. 6. The automatic processing method for oil leakage faults of a hydraulic system of a speed regulator according to claim 2 is characterized in that: The first guide vane servomotor (4A) and the second guide vane servomotor (4B) are arranged beside a water turbine relay ring (11) of the waterwheel chamber, two end control cavities of the first guide vane servomotor (4A) and the second guide vane servomotor (4B) are respectively connected with a mechanical pipeline (6), and the actions of the first guide vane servomotor (4A) and the second guide vane servomotor (4B) are controlled by controlling the pressure of the two end control cavities of the first guide vane servomotor (4A) and the second guide vane servomotor (4B), so as to control the actions of the water turbine relay ring (11) and the actions of the water turbine guide vanes.
  7. 7. The automatic processing method for oil leakage faults of a hydraulic system of a speed regulator according to claim 2 is characterized in that: The electric valve (5) is arranged on the mechanical pipeline (6), receives a switch control command of the PLC (2), and sends an electric valve switch state feedback signal to the PLC (2).
  8. 8. The automatic processing method for oil leakage faults of a hydraulic system of a speed regulator according to claim 2 is characterized in that: the mechanical pipeline (6) comprises first to tenth pipeline units; the two ends of the first pipeline unit are respectively connected with a first throttle valve (3) and an opening control cavity O of a first guide vane servomotor (4A); two ends of the second pipeline unit are respectively connected with the first throttle valve (3) and the open control cavity O of the second guide vane servomotor (4B); Two ends of the third pipeline unit are respectively connected with the first throttle valve (3) and the switching control valve group (8); Two ends of the fourth pipeline unit are respectively connected with a closing control cavity C and a switching control valve group (8) of the first guide vane servomotor (4A); two ends of the fifth pipeline unit are respectively connected with a closing control cavity C and a switching control valve group (8) of the second guide vane servomotor (4B); Two ends of the sixth pipeline unit are respectively connected with an opening control cavity O of the first guide vane servomotor (4A) and the second throttle valve (14); The two ends of the seventh pipeline unit are respectively connected with an opening control cavity O and a second throttle valve (14) of the second guide vane servomotor (4B); two ends of the eighth pipeline unit are respectively connected with a second throttle valve (14) and an oil return tank (9); Two ends of the ninth pipeline unit are respectively connected with a closing control cavity C of the first guide vane servomotor (4A) and the oil pressing tank (10); and two ends of the tenth pipeline unit are respectively connected with a closing control cavity C and a pressure oil tank (10) of the second guide vane servomotor (4B).
  9. 9. The automatic oil leakage fault processing method of the speed regulator hydraulic system is characterized by further comprising an electric loop (7), wherein the electric loop (7) comprises a switching valve control signal loop which is output to the electric valve (5) by the PLC (2) and a switching state feedback signal loop which is sent to the electric valve (5) of the PLC (2) on the electric valve (5).

Description

Automatic processing method for oil leakage fault of hydraulic system of speed regulator Aiming at the patent name of 'an automatic processing system and method for oil leakage faults of a speed regulator hydraulic system' (application number: 2021113715214; application date: 2021.11.18). Technical Field The invention relates to the technical field of automatic control of a hydraulic system of a speed regulator, in particular to an automatic processing method for oil leakage faults of the hydraulic system of the speed regulator. Background The hydro-generator set speed regulator regulates the set load and the rotation speed by controlling the opening degree of the guide vane, and the opening degree of the guide vane is controlled to provide the power for operating the guide vane by a speed regulator hydraulic system. Therefore, whether the speed regulator hydraulic system can safely and stably operate plays an important role in the process of generating power control of the hydroelectric generating set. When the speed regulator hydraulic system operates, if oil leakage occurs, the safe and stable operation of the hydroelectric generating set can be seriously threatened. At present, a perfect automatic processing system and a perfect automatic processing method for oil leakage faults of a hydraulic system of a speed regulator are not available, and when the oil leakage faults occur in the hydraulic system of the hydraulic turbine speed regulator, the automatic processing of the faults is carried out in time, so that the problems of accident expansion and the like caused by low manual handling speed and low efficiency are avoided. Disclosure of Invention The invention provides an automatic processing system and an automatic processing method for oil leakage faults of a speed regulator hydraulic system, which can be applied to the operation of the hydraulic system of a water turbine, and can be used for automatically and emergently processing faults if the oil leakage problem of the hydraulic system occurs, closing leakage pipelines and keeping the opening degree of guide vanes unchanged. If necessary, the guide vane closing operation is performed during the shutdown, so that the problems of accident expansion and the like caused by low manual handling speed and low efficiency are avoided, and the safety of a speed regulator hydraulic system and unit equipment is ensured. The technical scheme adopted by the invention is as follows: an automatic processing system for oil leakage faults of a speed regulator hydraulic system, comprising: the electric valve is arranged on the mechanical pipeline and is used for controlling the on-off of the mechanical pipeline; The hydraulic control system comprises a first guide vane servomotor, a first throttle valve, a second throttle valve, a first guide vane servomotor, a second guide vane servomotor, a first control valve and a second throttle valve, wherein the first throttle valve is arranged on a mechanical pipeline connected with an opening control cavity of the first guide vane servomotor, the second throttle valve is arranged on a mechanical pipeline connected with an opening control cavity of the second guide vane servomotor, and the first throttle valve and the second throttle valve are used for limiting the oil backflow speed of the opening control cavity of the first guide vane servomotor and the second guide vane servomotor when the guide vanes are closed. The first throttle valve is a guide vane closed one-way throttle valve. The switching control valve group is arranged on the mechanical pipeline and used for controlling the direction of an oil flow path in the mechanical pipeline; The system also comprises a guide vane position sensor for detecting displacement analog quantity signals of the first guide vane servomotor and the second guide vane servomotor. The electric valve, the switching control valve group and the guide vane position sensor are all connected with a PLC controller, and the PLC controller is respectively connected with the man-machine interaction device and the monitoring system. The man-machine interaction device displays the running state information picture of the speed regulator hydraulic system and the on-off state of each electric valve output by the PLC in real time, and transmits a stop guide vane closing instruction and an oil leakage fault manual resetting instruction of a user to the PLC in a communication mode. The PLC is used for collecting a stop guide vane closing instruction, an oil leakage fault manual resetting instruction and a state signal of the hydraulic system and a displacement analog quantity signal (which can be converted into a guide vane opening signal) of the first guide vane servomotor and the second guide vane servomotor, which are sent by the guide vane position sensor, which are sent by the monitoring system or the man-machine interaction device, and monitoring the oil leakage quantity of the hydraulic system o