A whole pressurizing system and method for a hydroelectric power station speed regulation system

Abstract

A kind of overall pressurizing system and method of hydroelectric station speed regulating system, including hydroelectric station hydraulic speed regulating system, further including pressurizing device and control device, the pressurizing device is connected with the main oil supply pipe oil discharge valve of hydroelectric station hydraulic speed regulating system by first pipeline, control device is connected with the main pressure distribution valve of hydroelectric station hydraulic speed regulating system by second pipeline, control device is connected with the first accident pressure distribution valve of hydroelectric station speed regulating system by third pipeline.Pressurizing device is used to pressurize main oil supply pipe, control device is used to control the valve core action of main pressure distribution valve, first accident pressure distribution valve, by setting pressurizing device and control device, realize before and after the maintenance of hydroelectric station hydraulic speed regulating system, overall pressure test is carried out to speed regulating system valve group and pipeline, check whether speed regulating system valve group and pipeline have oil leakage, crack and other defects.

Description

Technical Field

[0001] This invention relates to the field of hydro-generator maintenance technology, and in particular to an overall pressure testing system and method for a hydropower station speed regulation system. Background Technology

[0002] The speed control system is a core component of the hydropower turbine-generator unit, playing a crucial role in controlling guide vane opening, regulating output, and facilitating emergency shutdown. During major overhauls of the turbine-generator unit, valve assemblies and pipeline seals in the speed control system are typically replaced. However, due to a lack of means to inspect the installation quality of these valve assemblies and pipelines beforehand, if quality issues arise with seals or other components during the pressurization phase, addressing these defects usually requires 2-3 days of overnight work and severely impacts the unit's straight-line maintenance schedule.

[0003] The hydraulic system of a power plant's speed control system mainly consists of a hydraulic oil pressurization device, hydraulic valve groups, high-pressure ball valves, actuators, main oil supply pipelines, control oil pipelines, and valve blocks. The pressure oil tank and pressure air tank are connected by pipelines, with a turbine oil to compressed air ratio of approximately 1:3 and a rated pressure of 6.3 MPa. When the speed control system pressurizes, air needs to be pumped into the pressure air tank using an air compressor for at least 8 hours. When the speed control system depressurizes, all air in the pressure tanks needs to be expelled, which also requires at least 6 hours. During unit maintenance, the flange seals connecting the valve groups and pipelines need to be replaced. After maintenance, the quality of the seal installation cannot be judged visually. If installation defects are addressed only when the speed control system is pressurized, it will severely impact the straight-line maintenance schedule of the unit. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the problems existing in the background art and provide an overall pressure testing system for a hydropower station speed regulation system, which is suitable for conducting an overall pressure test on the valve group and pipeline of the speed regulation system before and after maintenance.

[0005] Another technical problem to be solved by the present invention is to provide a method for pressure testing the overall speed regulation system of a hydropower station. When used before maintenance, this method can be used to check for defects such as oil leakage and cracks in the valve group and pipeline of the speed regulation system. When used after maintenance, this method can be used to check the sealing and installation quality of the valve group and pipeline of the speed regulation system in advance, and to deal with defects such as oil leakage in a timely manner, so as to avoid delays in the straight-line construction period due to the treatment of defects in the speed regulation system.

[0006] To achieve the above-mentioned technical features, the present invention aims to provide an integrated pressure testing system for a hydropower station speed regulation system, comprising a hydropower station hydraulic speed regulation system, a pressure testing device, and a control device. The pressure testing device is connected to the main oil supply pipe drain valve of the hydropower station hydraulic speed regulation system via a first pipe, the control device is connected to the main pressure distribution valve of the hydropower station hydraulic speed regulation system via a second pipe, and the control device is connected to the first emergency pressure distribution valve of the hydropower station speed regulation system via a third pipe.

[0007] The pressurization device includes an oil tank and a high-pressure oil pump. The oil inlet pipe of the high-pressure oil pump extends into the oil tank. A check valve and a high-pressure ball valve are installed on the oil outlet pipe of the high-pressure oil pump. One end of the first pipe is connected to the main oil supply pipe drain valve, and the other end is connected to the high-pressure ball valve. A pressure regulating valve and a bypass drain valve are also installed in parallel on the oil outlet pipe between the high-pressure ball valve and the check valve. The return pipes of the pressure regulating valve and the bypass drain valve extend into the oil tank.

[0008] The control device includes an auxiliary pressure tank and a pressure supply device. The structure of the pressure supply device is the same as that of the pressure-pressurizing device. The auxiliary pressure tank is equipped with an air safety valve, a main air supply and exhaust valve, and a first ball valve. The first ball valve is connected to the upper end of a level gauge via a pipe. A second ball valve is installed at the lower end of the level gauge and is connected to the bottom of the auxiliary pressure tank via a pipe. A pressure sensor, an upper pressure switch, a lower pressure switch, and a mechanical pressure gauge are also installed in parallel at the lower end of the level gauge via a pipe. The oil outlet pipe of the pressure supply device is connected to the auxiliary pressure tank, and at least two oil tapping valves are installed in parallel on the oil outlet pipe. An oil outlet valve is installed on the oil outlet pipe between the auxiliary pressure tank and the oil tapping valves.

[0009] The method for pressure testing a hydropower station's hydraulic speed control system, as described above, includes the following steps: S1. The unit is shut down for maintenance, the movable guide vane opening is 50%~80%, the hydraulic speed regulation system is depressurized, the pressure oil tank is drained, and the pressure oil tank and pressure air tank are depressurized to 0MPa. S2. Remove the first connecting plate connecting the first relay to the control ring, remove the second connecting plate connecting the second relay to the control ring, and ensure that there are no obstacles in the extension and retraction paths of the first and second relays; S3. Close the main oil supply valve, emergency oil source valve, first pressure oil pump outlet ball valve, second pressure oil pump outlet ball valve and main control oil source valve; S4. Disconnect the control chamber pipeline joints on the first emergency pressure regulating valve and the second emergency pressure regulating valve. Except for the first interface on the first emergency pressure regulating valve, all other interfaces shall be fitted with plugs. The structure of the second emergency pressure regulating valve is the same as that of the first emergency pressure regulating valve. All interfaces on the second emergency pressure regulating valve shall be fitted with plugs. S5. Disconnect the pipeline from the main distribution control oil source valve to the main distribution pressure valve, retain the main distribution control oil source valve, and keep the main distribution control oil source valve in the closed state; S6. Remove the return oil pipe on the main pressure regulating valve, and install the main pressure regulating valve plug plate at the location where the return oil pipe was installed on the main pressure regulating valve. The main pressure regulating valve plug plate is equipped with an exhaust valve. S7. Connect the high-pressure ball valve to the main oil supply pipe drain valve through the first pipe; S8. Connect the control device to the main pressure regulating valve and the first emergency pressure regulating valve respectively; wherein, the first interface of the first emergency pressure regulating valve is connected to one of the oil tapping valves through a third pipe, and the control oil port on the main pressure regulating valve is connected to another oil tapping valve through a second pipe. S9. The oil tanks of the pressurizing and pressurizing devices are filled with turbine oil; S10. After pumping turbine oil into the auxiliary pressure tank to the rated oil level using the pressure supply device, close the oil outlet valve of the auxiliary pressure tank, and pressurize the auxiliary pressure tank to 1.5 times the rated working pressure through the air compressor or the hydropower station pressure air source from the main exhaust valve. S11. Open the oil outlet valve and use the upper and lower pressure switches to keep the pressure supply device in automatic operation, automatically maintaining the pressure and oil level in the auxiliary pressure tank within the normal range; at this time, the first interface is connected to pressure oil, and the first return port from the first emergency pressure distribution valve to the oil collection tank will be blocked by the valve core. S12. Lock the main pressure regulating valve in the fully open position, i.e., the valve core is at the bottom, by using the emergency start solenoid valve or stepper motor handwheel on the main pressure regulating valve. At this time, the second oil return port below the main pressure regulating valve will be blocked by the main pressure regulating valve core. S13. Start the pressure testing device and adjust it to the test pressure through the pressure regulating valve. At this time, pressurized oil will be input into the main oil supply pipe, and the main pressure regulating valve will be locked in the fully open position. The pressurized oil enters the main oil supply pipe from the main oil supply pipe drain valve, and then enters the upper chamber of the first servo and the lower chamber of the second servo through the main supply valve, the main pressure regulating valve, the first emergency pressure regulating valve, and the segmented shut-off valve, pushing the first and second servo to move. At the same time, the turbine oil in the lower chamber of the first servo and the upper chamber of the second servo passes through the second emergency pressure regulating valve into the channel in the main pressure regulating valve corresponding to the main pressure regulating valve plug. When turbine oil comes out of the exhaust valve of the main pressure regulating valve plug, it indicates that the air in the main oil supply pipe has been discharged. Close the exhaust valve. S14. Observe the pressure gauge at the outlet of the pressure testing device or on the main oil supply pipe. When the pressure rises to the test pressure, if the high-pressure oil pump is not stopped, the pressure test time can be calculated from this point. Observe whether there are any abnormalities, leaks, or cracks in each part of the pipeline, flange, weld, valve group, and relay. If the high-pressure oil pump is stopped, the time it takes for the pressure in the speed control system to drop from the test pressure to 0 can be calculated from this point to assess the internal leakage of the speed control system valve group, high-pressure ball valve, and pipeline.

[0010] If it is necessary to test the oil flow of the first and second servo motors at the same time, completely seal the control chamber of the segmented shut-off valve with a plug, open the exhaust valve on the main pressure distribution valve plug plate. At this time, the pressure oil will push the first servo motor to the fully extended state and the second servo motor to the fully retracted state. By measuring the oil flow at the exhaust valve, the oil flow of the pistons of the first and second servo motors is obtained.

[0011] After the speed control system of the hydro-generator unit is overhauled, repeat steps S3-S14 to check for any abnormalities or leaks in each pipeline valve group, pipeline, and servo connector.

[0012] After the speed control system of the hydro-generator unit is overhauled, an oil flow test is conducted to check the oil flow of the pistons of the first and second servo units.

[0013] The present invention has the following beneficial effects: 1. The pressure testing device is used to pressurize the main oil supply pipe, and the control device is used to control the valve core movement of the main pressure distribution valve and the first emergency pressure distribution valve. By setting up the pressure testing device and the control device, the overall pressure resistance test of the speed regulation system valve group and pipeline can be carried out before and after the maintenance of the hydraulic speed regulation system of the hydropower station, and the valve group and pipeline of the speed regulation system can be checked for defects such as oil leakage and cracks.

[0014] 2. Using this method before maintenance can check for defects such as oil leaks, cracks, and oil leakage between the pistons of the first and second servo drives in the speed control system valve assembly and pipelines. Using this method after maintenance can check the sealing and installation quality of the speed control system valve assembly and pipelines, as well as the sealing quality of the pistons of the first and second servo drives, and deal with defects such as oil leaks and oil leakage as early as possible, avoiding the interruption of the straight-line construction period due to the treatment of speed control system defects. It has outstanding practical value. Attached Figure Description

[0015] Figure 1 This is a block diagram illustrating the principle of the present invention.

[0016] Figure 2 This is a schematic diagram of the pressure device structure of the present invention.

[0017] Figure 3 This is a schematic diagram of the control device structure of the present invention.

[0018] Figure 4This is a schematic diagram of the pressure distribution valve for the first emergency.

[0019] Figure 5 This is a schematic diagram of the main pressure regulating valve.

[0020] In the diagram: 1. Pressure oil tank; 2. Pressure air tank; 3. Main oil supply valve; 4. Emergency oil source valve; 5. Isolation valve; 6. Main distribution oil supply valve; 7. Main distribution pressure valve; 7-1. Control oil port; 8. Second emergency distribution pressure valve; 9. First emergency distribution pressure valve; 9-2. First return oil port; 9-4. First interface; 10. Segmented shut-off valve; 11. First relay; 12. Second relay; 13. First connecting plate; 14. Second connecting plate; 15. Control ring; 16. Air replenishment valve; 17. First pressure oil pump outlet ball valve; 18. Second pressure oil pump outlet ball valve; 19. Main distribution pressure valve plug; 19-1. Exhaust valve; 20. Main oil supply pipe drain valve; 22. Main distribution control oil source valve; 23. Pressure testing device. Components: 23, oil tank 23-1, high-pressure oil pump 23-2, check valve 23-4, pressure regulating valve 23-5, bypass drain valve 23-6, high-pressure ball valve 23-7, auxiliary pressure tank 30, air safety valve 30-2, first ball valve 30-3, level gauge 30-4, second ball valve 30-5, pressure sensor 30-7, upper pressure switch 30-9, lower pressure switch 30-11, mechanical pressure gauge 30-13, oil outlet valve 30-15, oil take-up valve 30-17, air supply and exhaust main valve 30-20, pressure supply device 31, second pipeline 40-2, third pipeline 40-3, first pipeline 40-4, return oil pipe 50-1, control device 60. Detailed Implementation

[0021] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0022] In existing technologies, the structure of a hydroelectric power station hydraulic speed regulation system is as follows: Figure 1 As shown, it can be divided into oil pressure device, hydraulic valve group, high-pressure ball valve, actuator, main oil supply line, control oil line and valve block.

[0023] The hydraulic pressurization device mainly supplies power to the speed regulation system and consists of a pressure air tank 1, a pressure oil tank 2, a replenishing air valve 16, an oil collection tank (not marked in the figure), a hydraulic pump and its outlet valve group (not marked in the figure).

[0024] The hydraulic valve group mainly controls the opening and closing of the actuator guide vanes by switching oil circuits. It consists of isolation valve 5, main pressure regulating valve 7, second emergency pressure regulating valve 8, first emergency pressure regulating valve 9, and segmented shut-off valve 10.

[0025] The high-pressure ball valve is mainly used for manual control of the main oil supply line cutoff and opening. It consists of the main oil supply valve 3, the emergency oil source valve 4, the main distribution oil supply valve 6, the first pressure oil pump outlet ball valve 17, the second pressure oil pump outlet ball valve 18, the main oil supply line drain valve 20, and the main distribution control oil source valve 22.

[0026] The actuator is mainly used to control the opening and closing of the guide vanes, thereby regulating the unit's output and start-up / shutdown. It consists of a first servo motor 11, a second servo motor 12, a first connecting plate 13, a second connecting plate 14, and a control ring 15.

[0027] The main oil supply line connects all parts and transmits oil pressure. It consists of the connecting lines shown in the diagram.

[0028] The control oil lines and valve blocks are not fully marked in the figure. The pipelines connected to the control chambers of each hydraulic valve group are all control oil lines, which are mainly used to control the state of the valve core inside each hydraulic valve group, thereby realizing the switching of the oil circuit.

[0029] Example 1: See Figure 1-5 A pressure testing system for a hydropower station speed regulation system includes a hydraulic speed regulation system, a pressure testing device 23, and a control device 60. The pressure testing device 23 is connected to the main oil supply pipe drain valve 20 of the hydropower station hydraulic speed regulation system via a first pipe 40-4. The control device 60 is connected to the main pressure distribution valve 7 of the hydropower station hydraulic speed regulation system via a second pipe 40-2, and to the first emergency pressure distribution valve 9 of the hydropower station speed regulation system via a third pipe 40-3. The pressure testing device 23 is used to pressurize the main oil supply pipe, and the control device 60 is used to control the valve core movement of the main pressure distribution valve 7 and the first emergency pressure distribution valve 9. By setting up the pressure testing device 23 and the control device 60, an overall pressure resistance test can be performed on the valve group and pipeline of the speed regulation system before and after maintenance of the hydropower station hydraulic speed regulation system to check for defects such as oil leakage and cracks.

[0030] See Figure 2 The pressure-pressurizing device 23 includes an oil tank 23-1 and a high-pressure oil pump 23-2. The inlet pipe of the high-pressure oil pump 23-2 extends into the oil tank 23-1. A check valve 23-4 and a high-pressure ball valve 23-7 are installed on the outlet pipe of the high-pressure oil pump 23-2. One end of the first pipeline 40-4 is connected to the main oil supply pipe drain valve 20, and the other end is connected to the high-pressure ball valve 23-7. A pressure regulating valve 23-5 and a bypass drain valve 23-6 are also installed in parallel on the outlet pipe between the high-pressure ball valve 23-7 and the check valve 23-4. The return pipes of the pressure regulating valve 23-5 and the bypass drain valve 23-6 extend into the oil tank 23-1. The high-pressure oil pump can output pressure-adjustable oil through the pressure regulating valve, the check valve can prevent oil backflow, the high-pressure ball valve is used for pressure maintenance, and the bypass drain pipe is used for pressure relief. Through the above structure, pressure is applied to the main oil supply pipe.

[0031] See Figure 3The control device 60 includes an auxiliary pressure tank 30 and a pressure supply device 31. The structure of the pressure supply device 31 is the same as that of the pressure-pressurizing device 23. The auxiliary pressure tank 30 is equipped with an air safety valve 30-2, a main air supply and exhaust valve 30-20, and a first ball valve 30-3. The first ball valve 30-3 is connected to the upper end of a level gauge 30-4 through a pipe. A second ball valve 30-5 is installed at the lower end of the level gauge 30-4. The second ball valve 30-5 is connected to the auxiliary pressure tank 23 through a pipe. At the bottom of the pressure tank 30, a pressure sensor 30-7, an upper pressure switch 30-9, a lower pressure switch 30-11, and a mechanical pressure gauge 30-13 are also installed in parallel via a pipe at the lower end of the level gauge 30-4. The oil outlet pipe of the pressure supply device 31 is connected to the auxiliary pressure tank 30, and at least two oil tapping valves 30-17 are installed in parallel on the oil outlet pipe. An oil outlet valve 30-15 is installed on the oil outlet pipe between the auxiliary pressure tank 30 and the oil tapping valves 30-17.

[0032] Air safety valve 30-2 is used to prevent excessive pressure in auxiliary pressure tank 30; level gauge 30-4 is used to display the oil level in auxiliary pressure tank; pressure sensor 30-7 is used to monitor the oil pressure in auxiliary pressure tank in real time; upper pressure switch 30-9 and lower pressure switch 30-11 serve as pressure points for starting and stopping the high-pressure oil pump when pressure supply device 31 is in automatic mode; mechanical pressure gauge 30-13 is used to display the pressure in auxiliary pressure tank; oil outlet valve 30-15 is used to control the on / off of oil inlet and outlet pipelines of auxiliary pressure tank; oil tap valve 30-17 is used to output pressurized oil from auxiliary pressure tank; and air supply / air release valve 30-20 is used for initial air supply and exhaust after operation.

[0033] The overall structure and function of the pressure supply device 31 are similar to those of the pressure testing device 23. Compared to the pressure testing device 23, the pressure supply device 31 can receive pressure signals from the upper pressure switch 30-9 and the lower pressure switch 30-11 on the auxiliary pressure tank 30. When the high-pressure oil pump of the pressure supply device 31 is in automatic mode, the high-pressure oil pump starts when the pressure in the auxiliary pressure tank is lower than the pressure of the lower pressure switch 30-11 node; when the pressure in the auxiliary pressure tank is higher than the pressure of the upper pressure switch 30-9 node, the high-pressure oil pump stops, thereby ensuring that the pressure in the auxiliary pressure tank 30 is within the set range.

[0034] Example 2: The method for pressure testing a hydropower station's hydraulic speed control system, as described above, includes the following steps: S1. When the unit is shut down for maintenance, the movable guide vane opening is 50%~80%, preferably 50%. The hydraulic speed regulation system is depressurized, oil tank 1 is drained, and pressure tank 1 and pressure air tank 2 are depressurized to 0MPa.

[0035] S2. Remove the first connecting plate 13 connecting the first relay 11 to the control ring 15, remove the second connecting plate 14 connecting the second relay 12 to the control ring 15, and ensure that there are no obstacles in the extension and retraction path of the first relay 11 and the second relay 12. S3. Close the main oil supply valve 3, the emergency oil source valve 4, the first pressure oil pump outlet ball valve 17, the second pressure oil pump outlet ball valve 18, and the main control oil source valve 22.

[0036] S4. See also Figure 4 Remove the control chamber pipeline joints on the first emergency pressure regulating valve 9 and the second emergency pressure regulating valve 8. Except for the first interface 9-4 on the first emergency pressure regulating valve 9, all other interfaces are fitted with plugs. The structure of the second emergency pressure regulating valve 8 is the same as that of the first emergency pressure regulating valve 9. All interfaces on the second emergency pressure regulating valve 8 are fitted with plugs.

[0037] S5. Disconnect the pipeline from the main distribution control oil source valve 22 to the main distribution pressure valve 7, while keeping the main distribution control oil source valve 22 in the closed state.

[0038] S6. See also Figure 1 , 5 Remove the return oil pipe 50-1 on the main pressure regulating valve 7, and install the main pressure regulating valve plug plate 19 at the position where the return oil pipe 50-1 was installed on the main pressure regulating valve 7. An exhaust valve 19-1 is installed on the main pressure regulating valve plug plate 19.

[0039] S7. Connect the high-pressure ball valve 23-7 of the pressurizing device 23 to the main oil supply pipe drain valve 20 through the first pipe 40-4.

[0040] S8. Connect the control device 60 to the main pressure regulating valve 7 and the first emergency pressure regulating valve 9 respectively; wherein, the first port 9-4 of the first emergency pressure regulating valve 9 is connected to one of the oil tapping valves 30-17 through the third pipe 40-3, and the control port 7-1 on the main pressure regulating valve 7 is connected to the other oil tapping valve 30-17 through the second pipe 40-2.

[0041] S9. Turbine oil is filled into the oil tanks of the pressurizing device 23 and the pressure supply device 31.

[0042] S10. After pumping turbine oil into the auxiliary pressure tank 30 to the rated oil level using the pressure supply device 31, close the oil outlet valve 30-15 of the auxiliary pressure tank 30, and pressurize the auxiliary pressure tank 30 to 1.5 times the rated working pressure through the air compressor or the hydropower station pressure air source via the main exhaust valve 30-20.

[0043] S11. Open the oil outlet valve 30-15, and keep the pressure supply device 31 in automatic operation through the upper pressure switch 30-9 and the lower pressure switch 30-11, automatically maintaining the pressure and oil level in the auxiliary pressure tank 30 within the normal range; at this time, the first interface 9-4 is connected to the pressure oil, and the first return port 9-2 of the first emergency pressure distribution valve 9 to the oil collection tank will be blocked by the valve core.

[0044] S12. Lock the main pressure regulating valve 7 in the fully open position, i.e., the valve core is at the bottom, by using the emergency start solenoid valve or stepper motor handwheel on the main pressure regulating valve 7. At this time, the second oil return port 7-6 below the main pressure regulating valve 7 will be blocked by the main pressure regulating valve core.

[0045] S13. Start the pressure testing device 23 and adjust the pressure testing device 23 to the test pressure through the pressure regulating valve 23-5. At this time, pressure oil will be input into the main oil supply pipe, and the main pressure regulating valve 7 will be locked in the fully open position. The pressure oil enters the main oil supply pipe from the main oil supply pipe drain valve 20, and then enters the upper chamber of the first servo 11 and the lower chamber of the second servo 12 after passing through the main supply valve 6, the main pressure regulating valve 7, the first emergency pressure regulating valve 9 and the segmented shut-off valve 10. This pushes the first servo 11 and the second servo 12 to move. At the same time, the turbine oil in the lower chamber of the first servo 11 and the upper chamber of the second servo 12 enters the main pressure regulating valve 7 through the second emergency pressure regulating valve 8 into the channel corresponding to the main pressure regulating valve block plate 19. When turbine oil emerges from the exhaust valve 19-1 of the main pressure regulating valve block plate 19, it indicates that the air in the main oil supply pipe has been discharged. Close the exhaust valve 19-1.

[0046] S14. Observe the pressure gauge at the outlet of the pressure testing device 23 or on the main oil supply pipe. When the pressure rises to the test pressure, if the high-pressure oil pump 23-2 is not stopped, the pressure test time can be calculated from this point. Observe whether there are any abnormalities, leaks, or cracks in each part of the pipeline, flange, weld, valve group, and relay. If the high-pressure oil pump 23-2 is stopped, the time it takes for the pressure in the speed regulation system to drop from the test pressure to 0 can be calculated from this point. This allows for the assessment of the internal leakage of the speed regulation system valve group, high-pressure ball valve, and pipeline.

[0047] Using the above methods, before the overhaul of the hydro-generator unit, a pressure test is conducted on the entire speed control system pipeline and valve group to check for defects such as cracks in the pipeline welds, thus avoiding the waste of human resources caused by disassembling the entire pipeline before testing.

[0048] Example 3: If it is necessary to test the oil flow of the first servo 11 and the second servo 12 at the same time, the control chamber of the segmented shut-off valve 10 is completely blocked with a plug, and the exhaust valve 19-1 on the main pressure distribution valve plug plate 19 is opened. At this time, the pressure oil will push the first servo 11 to the fully extended state and the second servo 12 to the fully retracted state. By measuring the oil flow at the exhaust valve 19-1, the oil flow of the pistons of the first servo 11 and the second servo 12 is determined.

[0049] The above method enables the detection of the amount of oil in the pistons of the first relay 11 and the second relay 12.

[0050] Example 4: After the speed control system of the hydro-generator unit is overhauled, repeat steps S3-S14 to check for any abnormalities or leaks in each pipeline valve group, pipeline, and servo connector.

[0051] After the hydro-generator unit is overhauled, tests are conducted. Pressure tests are performed on the speed control system valve group and pipelines in advance to check the installation quality of pipelines and seals, so as to identify and resolve problems early.

[0052] Example 5: After the speed control system of the hydro-generator unit is overhauled, an oil flow test is conducted to check the oil flow of the pistons of the first servo motor 11 and the second servo motor 12.

[0053] After the hydro-generator unit is overhauled, the amount of oil in the pistons of the first servo motor 11 and the second servo motor 12 is checked to identify and resolve problems early.

Claims

1. A whole pressurization system for a hydroelectric station speed regulation system, comprising a hydroelectric station hydraulic speed regulation system, characterized in that: It also includes a pressure testing device (23) and a control device (60). The pressure testing device (23) is connected to the main oil supply pipe drain valve (20) of the hydropower station hydraulic speed regulation system through the first pipe (40-4). The control device (60) is connected to the main pressure distribution valve (7) of the hydropower station hydraulic speed regulation system through the second pipe (40-2). The control device (60) is connected to the first emergency pressure distribution valve (9) of the hydropower station speed regulation system through the third pipe (40-3). The control device (60) includes an auxiliary pressure tank (30) and a pressure supply device (31). The structure of the pressure supply device (31) is the same as that of the pressure-pressurizing device (23). An air safety valve (30-2), a main exhaust valve (30-20), and a first ball valve (30-3) are installed on the auxiliary pressure tank (30). The first ball valve (30-3) is connected to the upper end of the level gauge (30-4) through a pipe. A second ball valve (30-5) is installed at the lower end of the level gauge (30-4). The second ball valve (30-5) is connected to the lower end of the level gauge (30-4) through a pipe. At the bottom of the auxiliary pressure tank (30), the lower end of the level gauge (30-4) is also connected in parallel with a pressure sensor (30-7), an upper pressure switch (30-9), a lower pressure switch (30-11), and a mechanical pressure gauge (30-13) via a pipeline; the oil outlet pipe of the pressure supply device (31) is connected to the auxiliary pressure tank (30), and at least two oil tapping valves (30-17) are connected in parallel on the oil outlet pipe; an oil outlet valve (30-15) is installed on the oil outlet pipe between the auxiliary pressure tank (30) and the oil tapping valve (30-17).

2. The overall pressurization system for a hydroelectric power station speed regulation system according to claim 1, characterized in that: The pressurization device (23) includes an oil tank (23-1) and a high-pressure oil pump (23-2). The oil inlet pipe of the high-pressure oil pump (23-2) extends into the oil tank (23-1). A check valve (23-4) and a high-pressure ball valve (23-7) are installed on the oil outlet pipe of the high-pressure oil pump (23-2). One end of the first pipeline (40-4) is connected to the main oil supply pipe drain valve (20), and the other end is connected to the high-pressure ball valve (23-7). A pressure regulating valve (23-5) and a bypass drain valve (23-6) are also installed in parallel on the oil outlet pipe between the high-pressure ball valve (23-7) and the check valve (23-4). The return pipes of the pressure regulating valve (23-5) and the bypass drain valve (23-6) extend into the oil tank (23-1).

3. The method of claim 2, wherein the method is used for pressure test of the hydraulic speed regulation system of the hydropower station, and wherein the method further comprises: pressurizing the hydraulic speed regulation system of the hydropower station to a first pressure; and detecting whether the hydraulic speed regulation system of the hydropower station is in a normal state or not. Includes the following steps: S1. The unit is shut down for maintenance, the movable guide vane is opened to 50%~80%, the hydraulic speed regulation system is depressurized, the pressure oil tank (1) is drained, and the pressure oil tank (1) and pressure air tank (2) are depressurized to 0MPa. S2. Remove the first connecting plate (13) connecting the first relay (11) and the control ring (15), remove the second connecting plate (14) connecting the second relay (12) and the control ring (15), and ensure that there are no obstacles on the extension and retraction path of the first relay (11) and the second relay (12); S3. Close the main oil supply valve (3), emergency oil source valve (4), first pressure oil pump outlet ball valve (17), second pressure oil pump outlet ball valve (18) and main distribution control oil source valve (22). S4. Remove the control chamber pipeline joints on the first emergency pressure regulating valve (9) and the second emergency pressure regulating valve (8). Except for the first interface (9-4) on the first emergency pressure regulating valve (9), all other interfaces are fitted with plugs. The structure of the second emergency pressure regulating valve (8) is the same as that of the first emergency pressure regulating valve (9). All interfaces on the second emergency pressure regulating valve (8) are fitted with plugs. S5. Disconnect the pipeline from the main distribution control oil source valve (22) to the main distribution pressure valve (7), and keep the main distribution control oil source valve (22) closed; S6. Remove the return oil pipe (50-1) on the main pressure regulating valve (7), and install the main pressure regulating valve plug plate (19) at the position where the return oil pipe (50-1) is installed on the main pressure regulating valve (7). An exhaust valve (19-1) is installed on the main pressure regulating valve plug plate (19). S7. Connect the high-pressure ball valve (23-7) to the main oil supply pipe drain valve (20) through the first pipe (40-4); S8. Connect the control device (60) to the main pressure regulating valve (7) and the first emergency pressure regulating valve (9) respectively; wherein, the first port (9-4) of the first emergency pressure regulating valve (9) is connected to one of the oil tapping valves (30-17) through the third pipe (40-3), and the control port (7-1) on the main pressure regulating valve (7) is connected to the other oil tapping valve (30-17) through the second pipe (40-2); S9. Turbine oil is filled into the oil tanks of the pressurizing device (23) and the pressure supply device (31); S10. After pumping turbine oil into the auxiliary pressure tank (30) to the rated oil level using the pressure supply device (31), close the oil outlet valve (30-15) of the auxiliary pressure tank (30), and pressurize the auxiliary pressure tank (30) to 1.5 times the rated working pressure through the air compressor or the hydropower station pressure air source from the exhaust valve (30-20). S11. Open the oil outlet valve (30-15), and use the upper pressure switch (30-9) and lower pressure switch (30-11) to keep the pressure supply device (31) in automatic operation, automatically maintaining the pressure and oil level in the auxiliary pressure tank (30) within the normal range; at this time, the first interface (9-4) is connected to the pressure oil, and the first return port (9-2) from the first emergency pressure distribution valve (9) to the oil collection tank will be blocked by the valve core; S12. Lock the main pressure regulating valve (7) in the fully open position by using the emergency start solenoid valve or stepper motor handwheel on the main pressure regulating valve (7), that is, the valve core is at the bottom. At this time, the second oil return port (7-6) below the main pressure regulating valve (7) will be blocked by the main pressure regulating valve core. S13. Start the pressure testing device (23), and adjust the pressure testing device (23) to the test pressure through the pressure regulating valve (23-5). At this time, pressure oil will be input into the main oil supply pipe, the main pressure regulating valve (7) is locked in the fully open position, and the pressure oil enters the main oil supply pipe from the main oil supply pipe drain valve (20), and then enters the upper chamber of the first relay (11) and the second relay (23) after passing through the main distribution oil supply valve (6), the main pressure regulating valve (7), the first emergency pressure regulating valve (9) and the segmented shut-off valve (10). 12) The lower chamber pushes the first servo (11) and the second servo (12) to move. At the same time, the turbine oil in the lower chamber of the first servo (11) and the upper chamber of the second servo (12) enters the main pressure valve (7) through the second emergency pressure distribution valve (8) into the channel corresponding to the main pressure distribution valve block plate (19). When turbine oil comes out of the exhaust valve (19-1) of the main pressure distribution valve block plate (19), it indicates that the air in the main oil supply pipe has been discharged. Close the exhaust valve (19-1). S14. Observe the pressure gauge at the outlet of the pressure testing device (23) or on the main oil supply pipe. When the pressure rises to the test pressure, if the high-pressure oil pump (23-2) is not stopped, the pressure test time can be calculated from this point. Observe whether there are any abnormalities, leaks, or cracks in each part of the pipeline, flange, weld, valve group, and relay. If the high-pressure oil pump (23-2) is stopped, the time it takes for the pressure in the speed regulation system to drop from the test pressure to 0 can be calculated from this point. This will help to assess the internal leakage of the speed regulation system valve group, high-pressure ball valve, and pipeline.

4. The method of claim 3, wherein: If it is necessary to test the oil flow of the first servo (11) and the second servo (12) at the same time, the control chamber of the segmented shut-off valve (10) is completely blocked with a plug, and the exhaust valve (19-1) on the main pressure distribution valve plug plate (19) is opened. At this time, the pressure oil will push the first servo (11) to the fully extended state and the second servo (12) to the fully retracted state. By measuring the oil flow at the exhaust valve (19-1), the oil flow of the pistons of the first servo (11) and the second servo (12) is determined.

5. The method of claim 3, wherein: After the speed control system of the hydro-generator unit is overhauled, repeat steps S3-S14 to check for any abnormalities or leaks in each pipeline valve group, pipeline, and servo connector.

6. The method of claim 4, wherein: After the speed regulation system of the hydro-generator unit is overhauled, an oil leakage test is carried out to check whether the pistons of the first servo (11) and the second servo (12) are leaking oil.

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