Method for processing pressure abnormity of pressure oil tank of speed regulating system of large-scale hydro-generator

Abstract

The invention provides a large-scale hydro-generator speed regulation system pressure oil tank pressure abnormity processing method comprising the following steps: 1, when pressure oil tank pressure abnormity alarm is given, firstly determining whether an abnormal signal is correct; step 2, if the abnormal signal in the step 1 is true, continuing to judge whether the pressure is increased or decreased; 3, if it is judged that the pressure of the pressure oil tank rises in the step 2, executing according to a high-pressure inspection process; 4, if it is judged that the pressure of the pressure oil tank is reduced in the step 2, executing according to a low-pressure checking process; 5, judging whether the pressure of the speed regulating system is recovered or not through the processing; and 6, if recovery is carried out, normal operation of the unit is maintained, processing is carried out after recording and shutdown is carried out, and if recovery is not carried out, emergency shutdown and equipment isolation should be applied to dispatch. The method can make up for the manual processing difference caused by the professional performance of operation monitoring personnel, improves the reliability, ensures the rapid processing when the pressure of the pressure oil tank of the speed regulation system is abnormal, and reduces the accident expansion range.

Description

Technical Field

[0001] The present invention relates to the technical field of water turbine speed regulation, and in particular to a method for processing abnormal pressure of an oil pressure tank of a large water turbine generator speed regulation system. Background Art

[0002] The speed control system is a crucial component of a hydro-turbine generator set, and the oil pressure tank is one of its core components. It stores a certain ratio of compressed air and pressurized oil. Through the energy transfer of the pressurized oil, it provides stable and rapid power for adjusting the turbine guide vane opening. This ensures that the speed control system can respond quickly to grid frequency fluctuations or load changes. Therefore, maintaining constant pressure in the oil pressure tank of the speed control system is a necessary condition for maintaining the performance of the hydro-turbine generator set.

[0003] Currently, when the unit is running, if the oil tank pressure is abnormal, the operation monitoring personnel will check the alarm signal on the monitoring screen and conduct on-site inspections to find the cause of the abnormal oil tank pressure and deal with it. The defects of this treatment method are: (1) The current technical troubleshooting is slow and cannot quickly determine the cause of abnormal oil tank pressure, which reduces the efficiency of fault handling.

[0004] (2) When pressure anomalies occur in multiple units at the same time, it is easy for the fault to be not checked in time, which may cause the accident to escalate.

[0005] (3) The different levels of experience of the on-duty personnel may lead to untimely troubleshooting. Summary of the Invention

[0006] The purpose of the present invention is to provide a method for handling abnormal pressure in the oil tank of a speed control system of a large hydro-turbine generator. This method can make up for the human processing differences caused by the professionalism of the operation monitoring personnel, improve reliability, ensure that the abnormal pressure in the oil tank of the speed control system can be handled quickly, and reduce the scope of the accident.

[0007] In order to achieve the above technical features, the purpose of the present invention is to achieve the following: a method for handling abnormal pressure in the oil tank of a large-scale hydro-generator speed control system, comprising the following steps: Step 1: When the oil tank pressure alarm is abnormal, first determine whether the abnormal signal is correct; Step 2: If the abnormal signal in step 1 is true, continue to determine whether the pressure is rising or falling; Step 3: If the oil tank pressure is determined to have increased in step 2, the high pressure inspection process is followed; Step 4: If the oil tank pressure drops in step 2, the low pressure inspection process is followed; Step 5: After the above processing, determine whether the speed control system pressure is restored; Step 6: If the unit is restored, maintain normal operation and keep records for processing after shutdown. If the unit is not restored, apply to the dispatcher for emergency shutdown and isolate the equipment.

[0008] Preferably, the step 1 specifically includes: When the monitoring system receives an alarm about abnormal pressure in the oil tank of the speed control system, it first determines whether the sensor signal is true or false. If it is true, it proceeds to the next step; if it is false, it ends the process and notifies the maintenance personnel to check and handle the sensor.

[0009] Preferably, if the pressure rises in step 2, there is a problem that the speed control system safety valve is actuated or the oil pressure pump is started and cannot be stopped; If the pressure drops in step 2, there is an oil or air leakage in the speed control system.

[0010] Preferably, the high voltage inspection process in step 3 specifically includes: First, check the operating status of the oil pump of the speed control system to see if it is always in the loading state. If the oil pump cannot be unloaded, the pressure of the speed control system will rise to more than 6.3MPa and the speed control system will alarm. If the oil pump cannot be unloaded automatically, switch to manual unloading. If the automatic air supply valve cannot be closed, causing the pressure to rise, if a fault occurs, manually close the air supply valve to maintain a constant pressure in the speed control system.

[0011] Preferably, the specific judgment process of whether the oil pressure pump is always in the loaded state is: when the oil pressure tank pressure is ≤6.10MPa during the operation of the large-scale speed control system, the oil pressure pump main pump is loaded, and the oil pressure tank pressure of the speed control system rises; when the oil pressure tank pressure is ≥6.3MPa, the oil pressure pump main pump is unloaded, and the oil pressure pump loading outlet pressure is 6.78MPa.

[0012] Preferably, the specific judgment process of if the automatic air supply valve cannot be closed and causes the pressure to rise is: The logic for the automatic air supply valve to start air supply is that the oil level ≥2620mm and the oil tank pressure ≤6.18MPa are met at the same time, the automatic air supply valve opens; when the oil level in the oil tank ≤2320mm or the oil tank pressure ≥6.4MPa or the single air supply time reaches 300s, the automatic air supply valve closes.

[0013] Preferably, the low voltage inspection process in step 4 specifically includes: First, check whether there is any oil leakage or air leakage on site; whether the oil pressure pump is started. If it does not start automatically, manually start the oil pressure pump to maintain the pressure of the speed control system. If there is an air leakage on site, isolate the leaking part in time and replenish air to the speed control system. If the leaking part cannot be isolated, immediately apply for a shutdown; check whether there is any oil leakage on site, and isolate the leaking part. If it cannot be isolated and the amount of oil leakage is large, causing a pressure drop, immediately apply for a shutdown.

[0014] Preferably, the specific condition for starting the oil pressure pump is: when the speed control system pressure is ≤6.1MPa during the operation of the unit, the oil pressure pump is started.

[0015] Preferably, the speed regulation system pressure is maintained between 6.1 MPa and 6.3 MPa.

[0016] Preferably, the checking for oil leakage on site specifically includes the oil level in the pressure tank being less than or equal to 1900 mm, the oil level in the oil collecting tank being ≤650 mm, and the pressure of the speed control system being ≤5.7 MPa. If the unit startup conditions are not met, a shutdown will be triggered.

[0017] The present invention has the following beneficial effects: The present invention proposes a process for handling abnormal pressure in the oil tank of the speed control system of a large-scale hydro-generator set. Through the guidance of this operation process, it can compensate for the erroneous operation and missed operation caused by the difference in experience of the operators when an accident occurs, enhance the timeliness of handling the abnormal pressure in the oil tank of the speed control system, and ensure the safe and stable operation of the hydro-generator set. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and examples.

[0019] Figure 1 The present invention provides a flow chart for handling abnormal pressure in the oil tank of a large hydro-generator speed regulating system. DETAILED DESCRIPTION

[0020] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0021] Example 1: A method for handling abnormal pressure in a pressure oil tank of a large hydro-generator speed regulating system comprises the following steps: Step 1: When the monitoring system receives abnormal pressure in the speed control system oil tank, it first determines whether the sensor signal is true or false (this analog value is compared with other analog values). If it is true, it proceeds to the next step; if it is false, it ends the process and notifies the maintenance personnel to check and handle the sensor.

[0022] Step 2: If the abnormal pressure signal from the oil tank is true, determine whether the pressure is increasing or decreasing. If it is increasing, it may be accompanied by the activation of the speed control system safety valve or the inability to stop the oil pump. If it is decreasing, it may be due to oil or air leakage in the speed control system.

[0023] Step 3: When the oil tank pressure rises, first check the speed control system's oil pump status to see if it is constantly loaded and unable to unload. If the pump cannot automatically unload, switch to manual unloading. If the automatic air supply valve cannot close, causing the pressure to rise, manually close the air supply valve to maintain constant pressure in the speed control system.

[0024] Step 4: When the pressure in the pressure oil tank drops, first check for oil or air leaks. Check if the pressure oil pump starts automatically. If it does not start automatically, manually start the pressure oil pump to maintain the speed control system pressure. If there is an air leak, immediately isolate the leaking area and replenish air to the speed control system. If the leak cannot be isolated, immediately request a shutdown. Check for oil leaks and isolate the leaking area. If isolation is impossible and the leak is large and causing a pressure drop, immediately request a shutdown.

[0025] Step 5: After the above processing, determine whether the speed control system pressure is restored.

[0026] Step 6: If the unit is restored, maintain normal operation and keep records for processing after the shutdown. If the unit is not restored, apply to the dispatcher for an emergency shutdown and isolate the equipment.

[0027] Example 2: A method for handling abnormal pressure in a pressure oil tank of a large hydro-generator speed regulating system comprises the following steps: Step 1: When the monitoring system receives abnormal pressure in the speed control system oil tank, it first determines whether the sensor signal is true or false (this analog value is compared with other analog values). If it is true, it proceeds to the next step; if it is false, it ends the process and notifies the maintenance personnel to check and handle the sensor.

[0028] Step 2: If the abnormal pressure signal from the oil tank is true, determine whether the pressure is increasing or decreasing. If it is increasing, it may be accompanied by the activation of the speed control system safety valve or the inability to stop the oil pump. If it is decreasing, it may be due to oil or air leakage in the speed control system.

[0029] Step 3: When the oil tank pressure rises, first check the operating status of the speed control system's oil pump to see if it is constantly loaded. (In a large speed control system, when the oil tank pressure is ≤6.10 MPa, the main oil pump is loaded, and the speed control system's oil tank pressure rises. When the oil tank pressure is ≥6.3 MPa, the main oil pump is unloaded, and the oil pump's loaded outlet pressure is 6.78 MPa.) If the oil pump cannot unload, the speed control system pressure rises above 6.3 MPa, triggering an alarm. If the oil pump cannot automatically unload, manual unloading is initiated. If the automatic air supply valve fails to close, causing the pressure to rise (the automatic air supply valve activates air supply when the oil level is ≥2620 mm and the oil tank pressure is ≤6.18 MPa; it closes when the oil tank level is ≤2320 mm, the oil tank pressure is ≥6.4 MPa, or a single air supply lasts for 300 seconds), the air supply valve should be manually closed to maintain constant speed control system pressure.

[0030] Step 4: When the pressure of the pressure oil tank drops, first check whether there is any oil or air leakage on site. Check whether the pressure oil pump is started (when the speed control system pressure is ≤6.1MPa during unit operation, the pressure oil pump is started). If it does not start automatically, manually start the pressure oil pump to maintain the speed control system pressure between 6.1MPa and 6.3MPa. If there is an air leakage on site, isolate the leaking part in time and replenish air to the speed control system. If the leaking part cannot be isolated, apply for shutdown immediately. Check whether there is any oil leakage on site and isolate the leaking part (when the oil level in the pressure oil tank is less than or equal to 1900mm, the oil level in the oil sump is ≤650mm and the speed control system pressure is ≤5.7MPa, the unit startup conditions are not met and a shutdown will be triggered). If it cannot be isolated and the amount of oil leakage is large, causing a pressure drop, apply for shutdown immediately.

[0031] Step 5: After the above processing, determine whether the speed control system pressure is restored.

[0032] Step 6: If the unit is restored, maintain normal operation and keep records for processing after the shutdown. If the unit is not restored, apply to the dispatcher for an emergency shutdown and isolate the equipment.

[0033] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for handling abnormal pressure in the oil tank of a large hydro-generator speed control system, characterized in that: The following steps are involved: Step 1: When the oil tank pressure alarm is abnormal, first determine whether the abnormal signal is correct; Step 2: If the abnormal signal in step 1 is true, continue to determine whether the pressure is rising or falling; Step 3: If the oil tank pressure is determined to have increased in step 2, the high pressure inspection process is followed; Step 4: If the oil tank pressure drops in step 2, the low pressure inspection process is followed; Step 5: After the above processing, determine whether the speed control system pressure is restored; Step 6: If the unit is restored, maintain normal operation and keep records for processing after shutdown. If the unit is not restored, apply to the dispatcher for emergency shutdown and isolate the equipment.

2. A method for handling abnormal pressure in a pressure oil tank of a large hydro-generator speed regulating system according to claim 1, characterized in that: The step 1 specifically includes: When the monitoring system receives an alarm about abnormal pressure in the oil tank of the speed control system, it first determines whether the sensor signal is true or false. If it is true, it proceeds to the next step; if it is false, it ends the process and notifies the maintenance personnel to check and handle the sensor.

3. A method for handling abnormal pressure in a large-scale hydro-generator speed regulating system oil tank according to claim 2, characterized in that: If the pressure rises in step 2, there is a problem with the speed control system safety valve being actuated or the oil pressure pump being started and unable to stop; If the pressure drops in step 2, there is an oil or air leakage in the speed control system.

4. The method for handling abnormal pressure in the oil tank of a large hydro-generator speed regulating system according to claim 1, characterized in that: The high voltage inspection process in step 3 specifically includes: First, check the operating status of the oil pump of the speed control system to see if it is always in the loading state. If the oil pump cannot be unloaded, the pressure of the speed control system will rise to more than 6.3MPa and the speed control system will alarm. If the oil pump cannot be unloaded automatically, switch to manual unloading. If the automatic air supply valve cannot be closed, causing the pressure to rise, if a fault occurs, manually close the air supply valve to maintain a constant pressure in the speed control system.

5. A method for handling abnormal pressure in a pressure oil tank of a large hydro-generator speed regulating system according to claim 4, characterized in that: The specific judgment process of whether the oil pressure pump is always in the loaded state is as follows: when the oil pressure tank pressure is ≤6.10MPa during the operation of the large-scale speed control system, the oil pressure pump main pump is loaded, and the oil pressure tank pressure of the speed control system rises; when the oil pressure tank pressure is ≥6.3MPa, the oil pressure pump main pump is unloaded, and the oil pressure pump loading outlet pressure is 6.78MPa.

6. A method for handling abnormal oil tank pressure in a large hydro-generator speed regulating system according to claim 5, characterized in that: If the automatic air supply valve cannot be closed and the pressure rises, the specific judgment process is as follows: The logic for the automatic air supply valve to start air supply is that the oil level ≥2620mm and the oil tank pressure ≤6.18MPa are met at the same time, the automatic air supply valve opens; when the oil level in the oil tank ≤2320mm or the oil tank pressure ≥6.4MPa or the single air supply time reaches 300s, the automatic air supply valve closes.

7. A method for handling abnormal pressure in a pressure oil tank of a large hydro-generator speed regulating system according to claim 6, characterized in that: The low voltage inspection process in step 4 specifically includes: First, check whether there is any oil leakage or air leakage on site; whether the oil pressure pump is started. If it does not start automatically, manually start the oil pressure pump to maintain the pressure of the speed control system. If there is an air leakage on site, isolate the leaking part in time and replenish air to the speed control system. If the leaking part cannot be isolated, immediately apply for a shutdown; check whether there is any oil leakage on site, and isolate the leaking part. If it cannot be isolated and the amount of oil leakage is large, causing a pressure drop, immediately apply for a shutdown.

8. A method for handling abnormal pressure in a pressure oil tank of a large hydro-generator speed regulating system according to claim 7, characterized in that: The specific conditions for starting the oil pressure pump are: when the speed control system pressure is ≤6.1MPa during unit operation, the oil pressure pump starts.

9. A method for handling abnormal pressure in a pressure oil tank of a large hydro-generator speed regulating system according to claim 7, characterized in that: The speed regulating system pressure is maintained between 6.1 MPa and 6.3 MPa.

10. A method for handling abnormal pressure in a pressure oil tank of a large hydro-generator speed regulating system according to claim 7, characterized in that: The on-site inspection for oil leakage specifically includes the oil level in the pressure tank being less than or equal to 1900mm, the oil level in the oil collecting tank being ≤650mm, and the speed control system pressure being ≤5.7MPa. If the unit startup conditions are not met, a shutdown will be triggered.

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