CN111007835A - Control device and control method for faults of main sensor of speed regulator - Google Patents
Control device and control method for faults of main sensor of speed regulator Download PDFInfo
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- CN111007835A CN111007835A CN201911310287.7A CN201911310287A CN111007835A CN 111007835 A CN111007835 A CN 111007835A CN 201911310287 A CN201911310287 A CN 201911310287A CN 111007835 A CN111007835 A CN 111007835A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0259—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the response to fault detection
- G05B23/0262—Confirmation of fault detection, e.g. extra checks to confirm that a failure has indeed occurred
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24065—Real time diagnostics
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Abstract
A device and a method for controlling faults of a main sensor of a speed regulator comprise a CPU controller, a driver, a stepping motor proportional valve combination, a main pressure distributing valve, a speed regulator servomotor, a first main sensor, a second main sensor, an analog input module, a digital output module, a relay, a digital input module and a time timing module. The analog input module, the digital input module and the time timing module are respectively connected with a CPU controller, the CPU controller is connected with a driver, the driver is connected with a stepping motor proportional valve combination, the stepping motor proportional valve combination is connected with a main distributing valve, the main distributing valve is connected with a speed regulator servomotor, and the speed regulator servomotor is connected with a water turbine water guide mechanism. The invention judges the mechanical fault through the electrical fault, controls the governor accident, triggers the serious fault and the shutdown alarm of the governor when the governor has the main connection following fault, triggers the two types of mechanical accident shutdown processes when the governor is not switched to manual operation within 20 seconds, and can effectively solve the problem that the main connection sensor of the governor falls off and prevent the large load fluctuation of the unit.
Description
Technical Field
The invention relates to the field of hydraulic turbine speed regulator control in a hydraulic power plant, in particular to a fault control device for a main sensor of a speed regulator.
Background
When a main servomotor sensor sliding block of a sleeve A of the speed regulator is suddenly tripped in the load reducing process of the hydroelectric power station hydroelectric generating set, the feedback value of a sleeve A force device sensor is stable and does not change any more after the last adjustment before the fault, and the feedback value of a sleeve A force device sensor is basically stable and unchanged, and the feedback value of a sleeve B force device sensor is reduced in real time along with the load reducing process of the set, so that the feedback value of the sleeve A force device sensor is larger than the feedback value of the sleeve B force device sensor. When the speed regulator is in the process of executing load reduction regulation, the monitoring system is in an active closed loop mode, and the speed regulator is in a power regulation mode. At the moment, the speed regulator regulates according to a new active set value issued by the monitoring system, the guide vane opening set value calculated and output by the speed regulator power PID algorithm is correspondingly reduced compared with the guide vane opening set value calculated at the previous regulation, and the hydraulic actuating mechanism is driven to close the guide vane to the new guide vane opening set value calculated by the PID algorithm under the action of the position closed loop of the speed regulator servomotor, but a difference value delta is always existed between the guide vane opening set value and the guide vane opening feedback value because the guide vane opening feedback value in the program is always stable and unchanged, so the regulator always outputs a guide vane closing signal until the phenomenon of reverse power of the unit occurs, and the safe and stable operation of the unit and the power grid is directly influenced.
The main servomotor sensor slide block is connected to the servomotor piston follow-up support through a connecting rod so as to ensure that the slide block follows up with the servomotor piston rod. When the unit is in a grid-connected operation process, any one end or both ends of the two ends of the connecting rod are loosened and fall off, the feedback of the opening degree of the guide vane is distorted, and the phenomenon that the load of the unit is continuously twitched can be caused. Because the unit load fluctuation range is large, the change speed is high, the emergency time is generally only a few minutes, and when the main servomotor sensor connecting rod falls off, operators cannot timely operate the speed regulator on site to switch the speed regulator to a pure manual mode.
Disclosure of Invention
The invention provides a control device and a method for the fault of a main sensor of a speed regulator, which aims to solve the technical problem, introduces the concept of introducing the fault of the main sensor, namely the deviation between the actual measured value of the main sensor of the water turbine speed regulator and the given value of the opening degree of a guide vane is larger than a certain fixed value in a specified time, the fault of the main sensor can be reported when the change rate exceeds the limited range, the serious fault of the speed regulator and a stop alarm relay are triggered along with the fault, and the stop process of two types of mechanical accidents is triggered when the machine set is not manually operated after the time delay of 20s, so that the problem that the main sensor of the speed regulator falls off can.
The technical scheme adopted by the invention is as follows:
a control device for faults of a main sensor of a speed regulator comprises a CPU controller, a driver, a stepping motor proportional valve combination, a main pressure distributing valve, a speed regulator servomotor, a first main sensor, a second main sensor, an analog input module, a digital output module, a relay, a digital input module and a time timing module.
The analog input module, the digital input module and the time timing module are respectively connected with a CPU controller, the CPU controller is connected with a driver, the driver is connected with a stepping motor proportional valve combination, the stepping motor proportional valve combination is connected with a main distributing valve, the main distributing valve is connected with a speed regulator servomotor, and the speed regulator servomotor is connected with a water turbine water guide mechanism.
The speed regulator servomotor is respectively connected with a first main sensor and a second main sensor, and the first main sensor and the second main sensor are both connected with an analog quantity input module;
the CPU controller is connected with the digital output module, and the digital output module is connected with the relay.
The driver is used for controlling the forward rotation and the reverse rotation of the stepping motor proportional valve combination; the stepping motor proportional valve combination is used for controlling the main pressure distribution valve and determining the position of a valve core of the main pressure distribution valve.
The invention discloses a control device and a method for main sensor fault of a speed regulator, which have the following technical effects:
1: the control device can effectively solve the problem that the main sensor of the speed regulator falls off and prevent the large load fluctuation of the unit.
2: the control device can effectively solve the problem of reverse power when the main sensor fails in the load reduction process of the unit, and ensures the safe and stable operation of the unit.
3: the control device can effectively detect the mechanical fault of the falling of the main sensor, prevent the unit from frequently adjusting active power and frequently operating the opening of the guide vane, and effectively solve the problem of frequent start and stop of the oil pump.
Drawings
Fig. 1 is a control schematic diagram of the control device of the present invention.
FIG. 2 is a logic diagram of the primary sensor fault control of the control device of the present invention.
Fig. 3 is an external structural diagram of the control device of the present invention.
Detailed Description
As shown in fig. 1 to 3, a control device for a fault of a main sensor of a speed regulator comprises a CPU controller 1, a driver 2, a stepping motor proportional valve assembly 3, a main pressure distributing valve 4, a speed regulator servomotor 5, a first main sensor 7, a second main sensor 8, an analog input module 9, a digital output module 10, a relay 11, a digital input module 12, and a time counting module 15.
The first main sensor 7 and the second main sensor 8 are a main sensor a and a main sensor B in fig. 1, respectively. The main relay sensor is a main servomotor sensor.
The analog input module 9, the digital input module 12 and the time timing module 15 are respectively connected with the CPU controller 1, the CPU controller 1 is connected with the driver 2, the driver 2 is connected with the stepping motor proportional valve combination 3, the stepping motor proportional valve combination 3 is connected with the main pressure distribution valve 4, the main pressure distribution valve 4 is connected with the speed regulator servomotor 5, and the speed regulator servomotor 5 is connected with the water turbine water guide mechanism 6;
the speed regulator servomotor 5 is respectively connected with a first main sensor 7 and a second main sensor 8, and the first main sensor 7 and the second main sensor 8 are both connected with an analog input module 9;
the CPU controller 1 is connected with a digital output module 10, and the digital output module 10 is connected with a relay 11.
The driver 2 is used for controlling the forward rotation and the reverse rotation of the stepping motor proportional valve combination 3.
The stepping motor proportional valve combination 3 is used for controlling the main pressure distribution valve 4 and determining the position of a valve core of the main pressure distribution valve.
The main distributing valve 4 controls the speed regulator servomotor 5, and the speed regulator servomotor 5 controls the water guide mechanism 6 of the water turbine.
The device also comprises a control box 16, wherein a power line 17 is arranged on the left side of the control box 16, and a heat dissipation grid 18 is arranged on the right side of the control box 16; the handle 19 is installed on the upper side of the control box 16, and the touch screen 20, the indicator light 21, the operation button 22, the power switch button 23 and the terminal strip 24 are installed on the front surface of the control box 16. The control box 16 is internally provided with a power supply module 25, a CPU controller 1, an analog input module 9, a digital output module 10, a relay 11, a digital input module 12 and a time timing module 15. The power cord 17 is connected with a power module 25 in the control box, and the power module 25 converts the AC220V power into DC24V to supply power to the control box; the switch power supply button 23 is connected with the power supply module 25 through a lead to control the power supply of the internal loop of the control box; the touch screen 20 is connected with the CPU controller 1 in the control box 16 through Ethernet to perform data transmission, and is used for displaying the collected data, fault records and event information of the system; the indicator light 21 is connected with the relay 11 through a lead to indicate signals; the operation button 22 is connected with the analog input quantity module 9 to send out a guide vane opening given signal 13 and a main position given signal 14; the terminal block 24 is connected to the signal lines of the first main sensor 7 and the second main sensor 8 by wires or connected to the analog input signal and the analog input signal by wires.
When the main sensor of the hydraulic turbine governor is in fault, the touch screen 20 records fault and events, and the indicator light 21 indicates fault and gives a buzzer alarm. When the device normally operates, the guide vane opening given signal 13 and the main position given signal 14 can be sent to the CPU controller 1 by operating the button 22, and the specific use method is as follows:
in the first step, the power cord 17 is connected to an external power supply, the power module 25 converts the power output DC24V power supply, the switch power button 23 controls the power supply to the control box 16, and the power indicator light of the indicator light 21 is turned on.
Secondly, when the device normally operates, the touch screen displays signals collected by the first main sensor 7, signals collected by the second main sensor 8, action event records of the stepping motor proportional valve combination 3 and action records of the main distributing valve 4; when the main sensor of the hydraulic turbine governor is in a falling fault, the touch screen 20 displays fault records of the first main sensor 7 and the second main sensor 8, displays action event records of the stepping motor proportional valve combination 3 and the main distributing valve 4, and displays fault indication and buzzing alarm signal indication of the indicator light 21.
Thirdly, when the device normally operates, the guide vane opening given signal 13 and the main position given signal 14 can be sent out through the operation button 22 and transmitted to the CPU controller 1, and the CPU controller 1 can judge through logic and execute the second step.
The CPU controller 1 preferably uses a 3CP340.6 module of the beigalileo PLC.
The drive 2 is preferably of the RD-053 series SANY 0.
The step motor proportional valve combination 3 preferably adopts a German BOSCH high-performance proportional servo valve and a motor type conversion device as redundant electro-hydraulic converters.
The main distributing valve 4 is preferably WBLDT-150 type, and the diameter of the main valve core is 150 mm.
The speed regulator servomotor 5 preferably adopts a speed regulator model WBLDT-150, the diameter of a servomotor piston is 850mm, the maximum stroke of the servomotor is 575mm, and the total working volume of the servomotor is 0.65m for carrying out the speed regulation.
The first master sensor 7 is preferably an RP-S-700M-D60-1-A01 of the MTS series.
The second master sensor 8 is preferably an RP-S-700M-D60-1-A01 of the MTS series.
The analog input module 9 is preferably a 3AM374.6 module of the beigalileo series.
The digital output module 10 is preferably a 3DO486.6 module of the beigalileo series.
The relay 11 is preferably a DRM570220L product of the widemiler series.
The digital input module 12 is preferably a 3DI486.6 module of the beigalileo series.
The time counting module 15 is preferably an NC150 module of the beigalileo series.
The touch screen 20 is preferably a TP1900 touch screen.
The indicator light 21 is preferably a siemens APT three-color warning LED light.
The POWER module 25 is preferably a POWER ONE series LXN-2660-6M2 product.
A control method for preventing the main sensor of the governor of the hydraulic turbine from falling off, CPU controller 1 according to the actual analog quantity input of the input module 9 of analog quantity, judge whether the opening degree of guide vane feedbacks and guide vane opening degree and give the signal 13 to be in the deviation value, and then combine the input module 2 of digital quantity and time timing module 15, judge whether the governor of the hydraulic turbine governor takes place the main sensor of the governor and falls off the phenomenon, namely whether the main fault takes place;
if the main sensor falls off, the CPU controller 1 judges whether the cutter is manually operated within 20 seconds through the output values of the digital input module 2 and the time timing module 15, otherwise, triggers a second-class mechanical accident shutdown process;
if the conditions are met, the driver 2 is controlled, the driver 2 controls the stepping motor proportional valve combination 3 through the output value, the stepping motor proportional valve combination 3 controls the main distributing valve 4, and the main distributing valve 4 emergently operates the water turbine water guide mechanism 6 through the speed regulator servomotor 5.
A control method for preventing a main sensor of a hydraulic governor from falling off is characterized in that when a control system of the main sensor of the hydraulic governor is prevented from normally operating, control logic judgment of faults of the main sensor of the governor is completed in a CPU (central processing unit) controller 1, the logic control flow is shown in figure 2, and the specific control steps are as follows:
step S0: the system is initialized in the governor CPU controller 1, and after the initialization is completed, step S1 is performed.
Step S1: comparing a difference value between a guide vane opening feedback value sampled by a speed regulator servomotor sensor and a guide vane opening given value, and judging whether an absolute value of the difference value is smaller than an opening set value or not; if the condition is not met, executing step S1, adjusting the position of a valve core of a main distributing valve by the speed regulator along with the main distributing middle position, and controlling the speed regulator of the water turbine; if the condition is satisfied, execution of step S2 continues to determine the guide vane opening degree change rate.
Step S2: comparing the change time of the guide vane opening difference value, and executing the step S1 when the time of the guide vane opening feedback value and the time difference value given by the guide vane opening are smaller than the set time set value; when the time difference between the guide vane opening feedback value and the guide vane opening is greater than the set time set value, judging that the main sensor of the speed regulator is in fault, and executing step S3;
step S3: carrying out fault judgment processing on the fault, triggering a speed governor serious fault relay and a shutdown alarm relay, and manually cutting the speed governor;
step S4: judging whether the speed regulator is switched to be manual, and if the speed regulator is switched to be manual, performing fault checking processing by maintenance personnel; if the manual operation is not switched, executing step S5 to judge whether the delay time is up;
step S5: judging whether the time of delaying for 20 seconds is up after the speed governor is switched to the manual mode, if not, continuing returning to the step S3 for fault judgment processing; if the operation is not switched to manual operation, a secondary mechanical accident shutdown process is triggered in a protection loop of the monitoring system to perform accident shutdown.
Step S6: the machine set is shut down in case of accident.
Through the design of the fault control logic of the main sensor of the speed regulator, whether the main sensor falls off or not can be detected in real time according to each stage of the operation of the unit, so that major faults such as the falling off of the main sensor and the like are prevented, and the safe and stable operation of the unit is ensured. Particularly, the control logic judgment of the faults of the main sensor ensures the measuring reliability of the main sensor and improves the protection reliability of the whole unit.
The control device for the fault of the main sensor of the speed regulator has practical application value in a control system of the speed regulator of a hydraulic power plant and extremely has popularization value. The invention replaces mechanical control judgment by electrical control judgment, namely, mechanical failure is judged by electrical failure, accident control is carried out on the speed regulator, when the main connection following failure occurs to the speed regulator, serious failure and shutdown alarm of the speed regulator are triggered, and a secondary mechanical accident shutdown process is triggered when the main connection sensor of the speed regulator is not switched to manual operation within 20 seconds, so that the problem that the main connection sensor of the speed regulator falls off can be effectively solved, and the large load fluctuation of a unit can be prevented.
Claims (7)
1. A control device for faults of a main sensor of a speed regulator comprises a CPU (Central processing Unit) controller (1), a driver (2), a stepping motor proportional valve combination (3), a main pressure distribution valve (4), a speed regulator servomotor (5), a first main sensor (7), a second main sensor (8), an analog input module (9), a digital output module (10), a relay (11), a digital input module (12) and a time timing module (15); the method is characterized in that:
the analog input module (9), the digital input module (12) and the time timing module (15) are respectively connected with the CPU controller (1), the CPU controller (1) is connected with the driver (2), the driver (2) is connected with the stepping motor proportional valve combination (3), the stepping motor proportional valve combination (3) is connected with the main pressure distribution valve (4), the main pressure distribution valve (4) is connected with the speed regulator servomotor (5), and the speed regulator servomotor (5) is connected with the water turbine water guide mechanism (6);
the speed regulator servomotor (5) is respectively connected with a first main sensor (7) and a second main sensor (8), and the first main sensor (7) and the second main sensor (8) are both connected with an analog input module (9);
the CPU controller (1) is connected with a digital output module (10), and the digital output module (10) is connected with a relay (11).
2. The governor primary sensor fault control device of claim 1, wherein: the driver (2) is used for controlling the forward rotation and the reverse rotation of the stepping motor proportional valve combination (3); the stepping motor proportional valve combination (3) is used for controlling the main pressure distribution valve (4) and determining the position of a valve core of the main pressure distribution valve.
3. The governor primary sensor fault control device of claim 1, wherein: the device also comprises a control box (16), wherein a power line (17) is arranged on the left side of the control box (16), and a heat dissipation grid (18) is arranged on the right side of the control box (16);
handle (19) are installed to control box (16) upside, and touch-sensitive screen (20), pilot lamp (21), operating button (22), switch button (23), terminal row (24) are installed to control box (16) front.
4. The governor primary sensor fault control device of claim 3, wherein:
a power supply module (25), a CPU (Central processing Unit) controller (1), an analog input module (9), a digital output module (10), a relay (11), a digital input module (12) and a time timing module (15) are arranged in the control box (16); the power cord (17) is connected with a power module (25) in the control box, and the power module (25) converts the AC220V power into DC24V power for the control box; the switch power supply button (23) is connected with the power supply module (25) through a lead to control the power supply of the internal loop of the control box; the touch screen (20) is connected with a CPU (1) in the control box (16) through Ethernet to perform data transmission and is used for displaying the collected data, fault records and event information of the system; the indicator lamp (21) is connected with the relay (11) through a lead to indicate signals; the operation button (22) is connected with the analog input quantity module (9) to send out a guide vane opening given signal (13) and a main position given signal (14); the terminal strip (24) is connected with the signal lines of the first main sensor (7) and the second main sensor (8) through leads or connected with an analog input signal and an analog input signal through wires.
5. A control method for preventing a main sensor of a water turbine speed governor from falling off is characterized by comprising the following steps: the CPU controller (1) judges whether a deviation value exists between the guide vane opening feedback and a guide vane opening given signal (13) according to the actual analog quantity input by the analog quantity input module (9), and then judges whether a main connection sensor falling phenomenon of the speed governor occurs in the hydraulic governor or not by combining the digital quantity input module (12) and the time timing module (15), namely whether a main connection fault occurs or not;
if the main sensor falls off, the CPU controller (1) judges whether the cutter is manually operated within 20 seconds through the output values of the digital input module (2) and the time timing module (15), otherwise, triggers a second-class mechanical accident shutdown process;
if the conditions are met, the driver (2) is controlled, the driver (2) controls the stepping motor proportional valve combination (3) through the output value, the stepping motor proportional valve combination (3) controls the main distributing valve (4), and the main distributing valve (4) emergently operates the water turbine water guide mechanism (6) through the speed regulator servomotor (5).
6. A control method for preventing a main sensor of a water turbine speed governor from falling off is characterized by comprising the following steps: when a main sensor of the hydraulic turbine governor is in fault, a touch screen (20) is used for recording fault and events, an indicator lamp (21) is used for indicating fault and giving a buzzer alarm, and when the device normally operates, a guide vane opening given signal (13) and a main position given signal (14) are sent out through an operation button (22) and are transmitted to a CPU controller (1), and the specific method is as follows:
firstly, a power line (17) is connected to an external power supply, a power supply module (25) converts the power supply to output a DC24V power supply, a switch power supply button (23) controls the power supply to a control box (16), and a power supply indicator light of an indicator light (21) is lightened;
secondly, when the device normally operates, the touch screen displays signals collected by the first main sensor (7), signals collected by the second main sensor (8), action event records of the stepping motor proportional valve combination (3) and action records of the main pressure distribution valve (4); when the main sensor of the hydraulic turbine governor is in a falling fault, the touch screen (20) displays fault records of a first main sensor (7) and a second main sensor (8), displays action event records of a stepping motor proportional valve combination (3) and action event records of a main distributing valve (4), and indicates a fault indicator lamp (21) and a buzzing alarm signal;
and thirdly, when the device normally operates, a guide vane opening given signal (13) and a main position given signal (14) are sent out through an operation button (22) and are transmitted to the CPU controller (1), and the CPU controller (1) can judge through logic and execute the second step.
7. A control method for preventing a main sensor of a water turbine speed governor from falling off is characterized by comprising the following steps: when the control system of the main sensor of the hydraulic turbine governor is prevented from normally operating, the control logic judgment of the fault of the main sensor of the governor is completed in the CPU controller (1), and the specific control steps are as follows:
step S0: carrying out system initialization on a speed regulator CPU controller (1), and carrying out step S1 after the initialization is finished;
step S1: comparing a difference value between a guide vane opening feedback value sampled by a speed regulator servomotor sensor and a guide vane opening given value, and judging whether an absolute value of the difference value is smaller than an opening set value or not; if the condition is not met, executing step S1, adjusting the position of a valve core of a main distributing valve by the speed regulator along with the main distributing middle position, and controlling the speed regulator of the water turbine; if the condition is met, executing step S2 to continuously judge the change rate of the guide vane opening;
step S2: comparing the change time of the guide vane opening difference value, and executing the step S1 when the time of the guide vane opening feedback value and the time difference value given by the guide vane opening are smaller than the set time set value; when the time difference between the guide vane opening feedback value and the guide vane opening is greater than the set time set value, judging that the main sensor of the speed regulator is in fault, and executing step S3;
step S3: carrying out fault judgment processing on the fault, triggering a speed governor serious fault relay and a shutdown alarm relay, and manually cutting the speed governor;
step S4: judging whether the speed regulator is switched to be manual, and if the speed regulator is switched to be manual, performing fault checking processing by maintenance personnel; if the manual operation is not switched, executing step S5 to judge whether the delay time is up;
step S5: judging whether the time of delaying for 20 seconds is up after the speed governor is switched to the manual mode, if not, continuing returning to the step S3 for fault judgment processing; if the operation is not switched to manual operation, a secondary mechanical accident shutdown process is triggered in a protection loop of the monitoring system to perform accident shutdown.
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| CN201911310287.7A CN111007835A (en) | 2019-12-18 | 2019-12-18 | Control device and control method for faults of main sensor of speed regulator |
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| CN201911310287.7A CN111007835A (en) | 2019-12-18 | 2019-12-18 | Control device and control method for faults of main sensor of speed regulator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459957A (en) * | 2020-12-08 | 2021-03-09 | 中国长江电力股份有限公司 | Device and method for monitoring state of main distributing valve of speed regulator of water turbine |
| CN112523930A (en) * | 2020-12-08 | 2021-03-19 | 中国长江电力股份有限公司 | Device and method for monitoring operation failure of main distributing valve of water turbine speed regulator |
| CN114253123A (en) * | 2021-11-29 | 2022-03-29 | 国家电网有限公司 | Main distribution feedback adjusting method of speed regulator |
-
2019
- 2019-12-18 CN CN201911310287.7A patent/CN111007835A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459957A (en) * | 2020-12-08 | 2021-03-09 | 中国长江电力股份有限公司 | Device and method for monitoring state of main distributing valve of speed regulator of water turbine |
| CN112523930A (en) * | 2020-12-08 | 2021-03-19 | 中国长江电力股份有限公司 | Device and method for monitoring operation failure of main distributing valve of water turbine speed regulator |
| CN114253123A (en) * | 2021-11-29 | 2022-03-29 | 国家电网有限公司 | Main distribution feedback adjusting method of speed regulator |
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