Large fault judgment method for hydraulic system of hydraulic turbine governor

Abstract

The invention provides a hydraulic turbine governor hydraulic system big fault judgment method, which utilizes analog quantity, switching quantity and other signals acquired by a hydraulic system controller, properly increases program condition judgment and reasonable processes to execute hydraulic system big fault judgment logic, ensures long-term stable operation of a governor hydraulic system, and improves the reliability of the governor hydraulic system. Meanwhile, fault tracing is provided for maintainers when the hydraulic system of the speed regulator breaks down, the maintenance efficiency is improved, and stable operation of the speed regulator is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of water turbine speed regulation, and in particular to a method for judging a major fault of a hydraulic system of a water turbine speed regulator. Background Art

[0002] The speed governor of a hydro-turbine generator set adjusts the guide vane opening, unit power and frequency, and requires the operation of the governor hydraulic system to remain stable for a long time. The governor hydraulic system provides a continuous supply of pressurized oil to the governor system, thereby realizing the opening and closing of the unit guide vanes. The existing governor hydraulic system major fault judgment strategy is imperfect, resulting in failures in the hydraulic system, especially after sporadic failures, it is difficult for maintenance personnel to trace the source of the failure through on-site information. However, a universal and widely applicable hydraulic system major fault judgment system and method has not yet been disclosed. Summary of the invention

[0003] The present invention provides a method for judging a major fault in a hydraulic system of a turbine governor. This method enables the hydraulic system to trace the fault in a timely manner when a major fault occurs. The method has wide applicability, makes the control logic of the governor hydraulic system more orderly and intuitive, and is convenient for maintenance and fault diagnosis by engineering personnel.

[0004] In order to realize the above technical features, the object of the present invention is achieved as follows: A method for determining a major fault of a hydraulic system of a turbine governor comprises: Step 1: When the governor hydraulic system is running, the system pressure sensor fault module is connected to the OR gate module; Step 2: When the hydraulic system of the speed regulator is in operation, the pressure tank oil level extremely low contact module is connected to the OR gate module; Step 3: When the hydraulic system of the speed regulator is running, the oil level in the return tank is too low, and the contact module is connected to the OR gate module; Step 4: When the governor hydraulic system is running, the 1# pump fault module is connected to the first AND gate module; Step 5: When the speed governor hydraulic system is running, the 2# pump fault module is connected to the first AND gate module; Step 6: When the governor hydraulic system is running, the 3# pump fault module is connected to the first AND gate module; Step 7: When the speed governor hydraulic system is running, the N# pump fault module is connected to the first AND gate module; Step 8: When the speed governor hydraulic system is running, the hydraulic system running state module is connected to the second AND gate module; Step 9: When the speed governor hydraulic system is running, the pumpless operation module is connected to the second AND gate module; Step 10: When the speed governor hydraulic system is running, the hydraulic system running state module is connected to the third AND gate module; Step 11: When the speed governor hydraulic system is in operation, the isolation valve full-open module is reversed and connected to the third AND gate module; Step 12: During the operation of the hydraulic system of the speed regulator, the isolation valve opening failure module is connected to the OR gate module; Step 13: During the operation of the hydraulic system of the speed regulator, the isolation valve closing failure module is connected to the OR gate module; Step 14: When the speed governor hydraulic system is in operation, the isolation valve pressure-leveling failure module is connected to the OR gate module; Step 15: When the hydraulic system of the speed regulator is running, the hydraulic system startup failure module is connected to the OR gate module; Step 16: When the speed governor hydraulic system is running, the hydraulic system shutdown failure module is connected to the OR gate module; Step 17: When the speed governor hydraulic system is in operation, multiple pump idling modules are connected to the OR gate module; Step 18: When the speed governor hydraulic system is in operation, the fault recovery module is connected to the fourth AND gate module; Step 19: The output of the first AND gate module is connected to the OR gate module; Step 20: The output of the second AND gate module is connected to the OR gate module; Step 21: The output of the third AND gate module is connected to the OR gate module; Step 22: The output of the OR gate module is connected to the fourth AND gate module; Step 23: The output of the fourth AND gate module is connected to the hydraulic system major fault module.

[0005] Preferably, in step 1, if the sampling values ​​of all system pressure sensors in one cycle are greater than the upper limit or less than the lower limit, or the difference between the sampling values ​​in the previous and next cycles is greater than the jump setting value, the system pressure sensor fault module output is 1.

[0006] Preferably, in step 2, if the sampling values ​​of the pressure tank oil level sensor are all less than the extremely low oil level setting value within 3S and the pressure tank oil level extremely low magnetic contact is actuated, the pressure tank oil level extremely low contact module output is 1.

[0007] Preferably, in step 3, if the sampling values ​​of the return tank oil level sensor are all less than the low oil level setting value within 3S and the return tank oil level is too low magnetic contact is actuated, the return tank oil level is too low contact module output is 1.

[0008] Preferably, in step 8, if the hydraulic system isolation valve is in an open position, the hydraulic system operating state module output is 1.

[0009] Preferably, in step 12, if the hydraulic system has issued an isolation valve opening command but has not received isolation valve opening position feedback, the isolation valve opening failure module output is 1.

[0010] Preferably, in step 13, if the hydraulic system has issued an isolation valve closing command but has not received isolation valve closing position feedback, the isolation valve closing failure module output is 1.

[0011] Preferably, in step 14, if the pressure difference between the system oil pressure and the pressure oil tank is greater than the set oil pressure difference within two minutes after the hydraulic system is started, the isolation valve pressure equalization failure module output is 1.

[0012] Preferably, in step 15, if the isolation valve fails to equalize the pressure or the isolation valve fails to open during the hydraulic system startup process or the pump fails to start during the hydraulic system startup process, the hydraulic system startup failure module outputs 1.

[0013] Preferably, in step 16, if the isolation valve fails to close or the pump fails to stop during the shutdown of the hydraulic system, the output of the hydraulic system shutdown failure module is 1.

[0014] Beneficial effects of the present invention: 1. This method enables the hydraulic system to trace the fault in time when a major fault occurs. It has wide applicability, makes the control logic of the governor hydraulic system more orderly and intuitive, and is convenient for engineering personnel to maintain and diagnose faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a flowchart of the present invention.

[0017] In the figure: system pressure sensor fault module 1, pressure tank oil level extremely low contact module 2, return tank oil level too low contact module 3, 1# pump fault module 4, 2# pump fault module 5, 3# pump fault module 6, N# pump fault module 7, hydraulic system operation state module 8, no pump operation module 9, hydraulic system operation state module 10, isolation valve fully open module 11, isolation valve opening failure module 12, isolation valve closing failure module 13, isolation valve pressure equalization failure module 14, hydraulic system startup failure module 15, hydraulic system shutdown failure module 16, multiple pumps idling module 17, fault recovery module 18, first AND gate module 19, second AND gate module 20, third AND gate module 21, OR gate module 22, fourth AND gate module 23, hydraulic system major fault module 24. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0019] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0020] Embodiment 1: See also Figure 1 A method for determining a major fault in a hydraulic system of a turbine governor comprises: A method for determining a major fault of a hydraulic system of a turbine governor, comprising: Step 1: When the hydraulic system of the speed governor is in operation, the system pressure sensors are all faulty and the module 1 is connected to the OR gate module 22; Step 2: When the hydraulic system of the speed regulator is in operation, the oil level of the pressure tank is extremely low, and the contact module 2 is connected to the OR gate module 22; Step 3: When the hydraulic system of the speed regulator is in operation, the oil level in the return tank is too low, and the contact module 3 is connected to the OR gate module 22; Step 4: When the speed governor hydraulic system is running, the 1# pump fault module 4 is connected to the first AND gate module 19; Step 5: When the speed governor hydraulic system is running, the 2# pump fault module 5 is connected to the first AND gate module 19; Step 6: When the speed governor hydraulic system is running, the 3# pump fault module 6 is connected to the first AND gate module 19; Step 7: When the speed governor hydraulic system is running, the N# pump fault module 7 is connected to the first AND gate module 19; Step 8: When the speed regulator hydraulic system is running, the hydraulic system running state module 8 is connected to the second AND gate module 20; Step 9: When the speed regulator hydraulic system is running, the pumpless operation module 9 is connected to the second AND gate module 20; Step 10: When the speed regulator hydraulic system is running, the hydraulic system running state module 10 is connected to the third AND gate module 21; Step 11: When the speed regulator hydraulic system is in operation, the isolation valve full-open module 11 is reversed and connected to the third AND gate module 21; Step 12: During the operation of the governor hydraulic system, the isolation valve opening failure module 12 is connected to the OR gate module 22; Step 13: During the operation of the hydraulic system of the speed regulator, the isolation valve closing failure module 13 is connected to the OR gate module 22; Step 14: During the operation of the governor hydraulic system, the isolation valve pressure-leveling failure module 14 is connected to the OR gate module 22; Step 15: When the speed governor hydraulic system is running, the hydraulic system startup failure module 15 is connected to the OR gate module 22; Step 16: When the speed governor hydraulic system is running, the hydraulic system shutdown failure module 16 is connected to the OR gate module 22; Step 17: When the speed governor hydraulic system is in operation, the multiple pump idling modules 17 are connected to the OR gate module 22; Step 18: When the speed governor hydraulic system is in operation, the fault recovery module 18 is connected to the fourth AND gate module 23; Step 19: The output of the first AND gate module 19 is connected to the OR gate module 22; Step 20: The output of the second AND gate module 20 is connected to the OR gate module 22; Step 21: The output of the third AND gate module 21 is connected to the OR gate module 22; Step 22: The output of the OR gate module 22 is connected to the fourth AND gate module 23; Step 23 : The output of the fourth AND gate module 23 is connected to the hydraulic system major fault module 24 .

[0021] Furthermore, in step 1, if the sampling values ​​of all system pressure sensors in one cycle are greater than the upper limit or less than the lower limit, or the difference between the sampling values ​​in the previous and next cycles is greater than the jump setting value, the system pressure sensor fault module 1 outputs 1.

[0022] Furthermore, in step 2, if the sampling values ​​of the pressure tank oil level sensor are all less than the extremely low oil level setting value within 3S and the pressure tank oil level extremely low magnetic contact is actuated, the pressure tank oil level extremely low contact module 2 outputs 1.

[0023] Furthermore, in step 3, if the sampling values ​​of the oil level sensor of the return tank are all less than the low oil level setting value within 3S and the return tank oil level is too low magnetic contact is actuated, the return tank oil level is too low contact module 3 outputs 1.

[0024] Furthermore, in step 8, if the hydraulic system isolation valve is in the open position, the output of the hydraulic system operation state module 8 is 1.

[0025] Furthermore, in step 12, if the hydraulic system has issued an isolation valve opening command but has not received isolation valve opening position feedback, the isolation valve opening failure module 12 outputs 1.

[0026] Furthermore, in step 13, if the hydraulic system has issued an isolation valve closing command but has not received isolation valve closing position feedback, the isolation valve closing failure module 13 outputs 1.

[0027] Furthermore, in step 14, if the pressure difference between the system oil pressure and the pressure oil tank is greater than the set oil pressure difference within two minutes after the hydraulic system is started, the output of the isolation valve pressure equalization failure module 14 is 1.

[0028] Furthermore, in step 15, if the isolation valve fails to equalize the pressure or the isolation valve fails to open during the hydraulic system startup process or the pump fails to start during the hydraulic system startup process, the output of the hydraulic system startup failure module 15 is 1.

[0029] Furthermore, in step 16, if the isolation valve fails to close or the pump fails to stop during the shutdown of the hydraulic system, the output of the hydraulic system shutdown failure module 16 is 1.

Claims

1. A method for determining a major fault in a hydraulic system of a turbine governor, characterized in that: include: Step 1: When the speed governor hydraulic system is running, the system pressure sensor fault module (1) is connected to the OR gate module (22); Step 2: When the hydraulic system of the speed regulator is in operation, the pressure tank oil level extremely low contact module (2) is connected to the OR gate module (22); Step 3: When the hydraulic system of the speed regulator is in operation, the oil level in the oil return tank is too low, and the contact module (3) is connected to the OR gate module (22); Step 4: When the speed governor hydraulic system is in operation, the 1# pump fault module (4) is connected to the first AND gate module (19); Step 5: When the speed governor hydraulic system is in operation, the 2# pump fault module (5) is connected to the first AND gate module (19); Step 6: When the speed governor hydraulic system is in operation, the 3# pump fault module (6) is connected to the first AND gate module (19); Step 7: When the speed governor hydraulic system is in operation, the N# pump fault module (7) is connected to the first AND gate module (19); Step 8: When the speed regulator hydraulic system is in operation, the hydraulic system operation state module (8) is connected to the second AND gate module (20); Step 9: When the speed regulator hydraulic system is in operation, the pumpless operation module (9) is connected to the second AND gate module (20); Step 10: When the speed regulator hydraulic system is in operation, the hydraulic system operation state module (10) is connected to the third AND gate module (21); Step 11: When the speed regulator hydraulic system is in operation, the isolation valve full-open module (11) is reversed and connected to the third AND gate module (21); Step 12: When the speed governor hydraulic system is in operation, the isolation valve opening failure module (12) is connected to the OR gate module (22); Step 13: When the speed governor hydraulic system is in operation, the isolation valve closing failure module (13) is connected to the OR gate module (22); Step 14: When the speed regulator hydraulic system is in operation, the isolation valve pressure-leveling failure module (14) is connected to the OR gate module (22); Step 15: When the speed regulator hydraulic system is running, the hydraulic system startup failure module (15) is connected to the OR gate module (22); Step 16: When the speed regulator hydraulic system is running, the hydraulic system shutdown failure module (16) is connected to the OR gate module (22); Step 17: When the speed regulator hydraulic system is in operation, the plurality of pump idling modules (17) are connected to the OR gate module (22); Step 18: When the speed regulator hydraulic system is in operation, the fault recovery module (18) is connected to the fourth AND gate module (23); Step 19: The output of the first AND gate module (19) is connected to the OR gate module (22); Step 20: The output of the second AND gate module (20) is connected to the OR gate module (22); Step 21: The output of the third AND gate module (21) is connected to the OR gate module (22); Step 22: The output of the OR gate module (22) is connected to the fourth AND gate module (23); Step 23: The output of the fourth AND gate module (23) is connected to the hydraulic system major fault module (24).

2. A method for determining a major fault in a hydraulic system of a turbine governor according to claim 1, characterized in that: In step 1, if the sampling values ​​of all system pressure sensors in one cycle are greater than the upper limit or less than the lower limit, or the difference between the sampling values ​​in the previous and next cycles is greater than the jump setting value, the system pressure sensor fault module (1) outputs 1.

3. A method for determining a major fault in a hydraulic system of a turbine governor according to claim 1, characterized in that: In step 2, if the sampled values ​​of the pressure tank oil level sensor are all less than the extremely low oil level setting value within 3 seconds and the pressure tank oil level extremely low magnetic contact is actuated, the output of the pressure tank oil level extremely low contact module (2) is 1.

4. A method for determining a major fault in a hydraulic system of a turbine governor according to claim 1, characterized in that: In step 3, if the sampling values ​​of the oil level sensor of the oil return tank are all less than the low oil level setting value within 3 seconds and the oil return tank oil level low magnetic contact is actuated, the output of the oil return tank oil level low contact module (3) is 1.

5. A method for determining a major fault in a hydraulic system of a turbine governor according to claim 1, characterized in that: In step 8, if the hydraulic system isolation valve is in the open position, the output of the hydraulic system operation state module (8) is 1.

6. A method for determining a major fault in a hydraulic system of a turbine governor according to claim 1, characterized in that: In step 12, if the hydraulic system has issued an isolation valve opening command but has not received isolation valve opening position feedback, the isolation valve opening failure module (12) outputs 1.

7. A method for determining a major fault in a hydraulic system of a turbine governor according to claim 1, characterized in that: In step 13, if the hydraulic system has issued an isolation valve closing command but has not received isolation valve closing position feedback, the isolation valve closing failure module (13) outputs 1.

8. A method for determining a major fault in a hydraulic system of a turbine governor according to claim 1, characterized in that: In step 14, if the pressure difference between the system oil pressure and the pressure oil tank is greater than the set oil pressure difference within two minutes after the hydraulic system is started, the isolation valve pressure equalization failure module (14) outputs 1.

9. A method for determining a major fault in a hydraulic system of a turbine governor according to claim 1, characterized in that: In step 15, if the isolation valve fails to level the pressure or the isolation valve fails to open during the hydraulic system startup process or the pump fails to start during the hydraulic system startup process, the output of the hydraulic system startup failure module (15) is 1.

10. A method for determining a major fault in a hydraulic system of a turbine governor according to claim 1, characterized in that: In step 16, if the isolation valve fails to close or the pump fails to stop during the hydraulic system shutdown process, the hydraulic system shutdown failure module (16) outputs 1.

Images