Control system and method for low-oil-level protection shutdown of oil pressure device of water-turbine generator set

Abstract

The invention discloses a control system and method for low-oil-level protection shutdown of an oil pressure device of a water-turbine generator set. The system aims at solving the problem that in the prior art, when the oil level of a pressure oil tank is too low, enough oil sources cannot be provided for backup protection. The oil level measuring sensor of the pressure oil tank is additionally arranged, and the unit local control unit and the monitoring system are combined, so that real-time monitoring of the oil level and low-oil-level automatic stop control are achieved; the key technology is that oil level data of two pressure oil tanks are accessed to a local control unit, a low-oil-level shutdown control program is designed, and when the oil level is lower than a set value, a shutdown process is automatically executed; in addition, the monitoring system is used for monitoring the abnormal condition of the oil level and outputting an alarm signal. Safe and stable operation of the unit is effectively guaranteed, and the safety performance is improved; the system also has fault self-diagnosis and remote communication functions, so that operation and maintenance personnel can quickly position problems and carry out remote monitoring and operation, and the intelligent level and the emergency response capability of the operation of the hydropower station are further enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of automatic control of hydropower stations, and in particular to a control system and method for low oil level protection shutdown of an oil pressure device of a hydro-generator set. Background Art

[0002] As an important equipment in a hydropower station, the stable operation of a hydro-turbine generator set is directly related to the safety and efficiency of the power system. As the main energy supply device for the turbine to operate the guide vanes, blades, and adjust the load, the pressure oil tank is an indispensable auxiliary equipment for the hydro-turbine generator set. In the prior art, a hydro-turbine generator set is usually equipped with two pressure oil tanks (tank A and tank B), which are connected by a U-shaped pipe to ensure the consistency of the oil pressure and oil level. Each pressure oil tank is equipped with a pressure transmitter and a magnetic flap level gauge for real-time monitoring of the oil pressure and oil level status. In addition, the pressure vessel tank A is also equipped with an electric contact pressure gauge or a pressure switch. These devices together constitute the monitoring and control system of the pressure oil tank.

[0003] In the existing control system, the pressure transmitter of pressure vessel A and the oil level signal of the magnetic flap level gauge are connected to the oil pressure device PLC. The PLC controls the start and stop of the oil pump and the start and stop of the automatic air replenishment through the collected oil pressure and oil level data, so as to maintain the oil pressure and oil level in the oil tank within the range required for the normal operation of the turbine unit. At the same time, the electric contact pressure gauge (low oil pressure) on pressure vessel A and the pressure transmitter signal on pressure vessel B are connected to the local control unit (LCU, Local Control Unit) to trigger the low oil pressure protection shutdown process when the oil pressure is too low. This protection mechanism can effectively start the emergency shutdown process when the oil pressure is too low to maintain the normal operation of the unit to prevent further damage to the unit.

[0004] However, the existing technology has a significant defect and deficiency. Although the low oil pressure protection shutdown process can start the emergency shutdown process when the oil pressure is too low, it cannot ensure backup protection when the oil-gas ratio of the pressure oil tank container is unbalanced, resulting in normal pressure but too little oil, and unable to provide sufficient oil source for the unit to operate the guide vanes, blades, and adjust the load. When the oil level in the pressure oil tank is too low, it may cause the unit control to lose control, thereby affecting the safe and stable operation of the unit.

[0005] In response to this problem, the industry urgently needs a technical solution that can automatically alarm and start the low oil level protection shutdown process when the oil level in the pressure oil tank is too low, so as to ensure that the hydro-turbine generator set can be shut down quickly and reliably under abnormal circumstances to prevent the accident from expanding. This is exactly the technical problem that the present invention aims to solve. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a control system and method for low oil level protection shutdown of the oil pressure device of a hydro-turbine generator set, so as to solve the problem in the prior art that when the oil-gas ratio is unbalanced, the pressure oil tank cannot provide sufficient oil source for the unit to operate the guide vanes, wheel blades, and adjust the load even if the pressure is normal but the oil volume is too small, and there is a lack of an effective backup protection mechanism, thereby preventing the unit from getting out of control due to too low oil level, affecting the safe and stable operation of the unit.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a control system for low oil level protection shutdown of the oil pressure device of a hydro-generator set, comprising: Two pressure oil tanks, which are connected by a U-shaped pipe to ensure that the oil pressure and oil level are consistent; At least two sets of magnetic flap level gauges are installed on the two pressure oil tank bodies respectively to collect the oil level data in the respective oil tanks; The local control unit LCU of the unit receives the analog signal of the oil level of the pressure oil tank and the switch signal of the oil level limit from the magnetic flap level gauge, and runs the low oil level shutdown control program. When the preset low oil level shutdown conditions are met, a command is sent to the execution device to execute the automatic shutdown process; The monitoring system is used to monitor abnormal oil level in the pressure oil tank and receive alarm signals and shutdown status information from the local control unit of the unit.

[0008] In a preferred solution, the two pressure oil tanks include a first pressure oil tank and a second pressure tank, and the first pressure oil tank and the second pressure tank are connected in a U-shaped tube manner to ensure that the oil pressure and oil level are consistent.

[0009] In a preferred solution, the local control unit LCU of the unit is interconnected with the monitoring system through communication to achieve real-time uploading of equipment operation information and issuing of instructions.

[0010] In a preferred solution, the actuator includes an overspeed solenoid valve arranged on the oil circuit of the turbine guide vane blade, and a protection device arranged on the local control unit LCU of the unit, and the protection device includes a circuit breaker.

[0011] The control method of the low oil level protection shutdown of the oil pressure device of the hydro-turbine generator set is to use any of the above-mentioned control systems of the low oil level protection shutdown of the oil pressure device of the hydro-turbine generator set to execute the automatic shutdown process, including the following steps: Step 1: Open the overspeed solenoid valve to cut off the oil circuit of the turbine guide vane blades and fully close the guide vane blades; Step 2: Send the accident signal to the protection device, and the protection device trips the circuit breaker after receiving the accident signal; Step 3: If the circuit breaker does not trip, the local control unit LCU of the unit issues a circuit breaker trip command; Step 4: After the circuit breaker trips, execute the process from no-load to shutdown.

[0012] In a preferred solution, the unit local control unit LCU also includes: The newly added low oil level shutdown protection link serves as the entry judgment for the low oil level protection shutdown process; The designed condition judgment and shutdown process, after the unit enters the no-load state, if it is detected that the oil level in the pressure oil tank is lower than the preset low oil level limit, the low oil level protection shutdown process will be executed.

[0013] In a preferred embodiment, the monitoring system further includes a script for comparing the analog values ​​of the oil levels of the two pressure oil tanks. When the difference between the analog values ​​of the oil levels of the two oil tanks exceeds a preset range, an alarm signal is output to alert operation and maintenance personnel.

[0014] In a preferred solution, the low oil level shutdown conditions include: The two oil level contacts of the magnetic flap level gauge of the first pressure oil tank will act simultaneously when the oil level is too low or too low; The oil level analog value output by the magnetic flap level gauge of the second pressure oil tank is lower than the preset lower limit value.

[0015] The control method for low oil level protection shutdown of the hydraulic device of a hydro-generator set provided by the present invention has the following beneficial effects: 1. The present invention solves the problem that the low oil pressure protection shutdown process in the prior art cannot ensure that when the oil-gas ratio of the pressure oil tank container is unbalanced, the pressure is normal but the oil volume is too little, sufficient oil source is provided for backup protection, resulting in loss of control of the unit and affecting the safe and stable operation of the unit; 2. The system of the present invention effectively solves the problem that the unit cannot maintain load regulation requirements due to the low oil level in the pressure oil tank; 3. The configuration of the pressure oil tank and the magnetic flap level gauge thereon of the present invention ensures the accuracy and reliability of oil level measurement to meet the requirements of load regulation of the hydro-generator set; 4. The present invention connects the oil level of the magnetic flap level gauge of the second pressure tank to the local control unit LCU of the unit, and adds two oil level contacts (oil level too low, oil level ultra-low) on the magnetic flap level gauge of the first pressure tank to connect to the local control unit of the unit, ensuring that the unit can respond quickly when the oil level of the pressure oil tank is abnormal, automatically cut off the power supply and shut down, effectively preventing mechanical failures and safety hazards caused by too low oil level, and improving the safety and stability of the operation of the hydropower station; 5. The present invention adds a unit low oil level shutdown protection link in the unit's on-site control unit LCU as an entry judgment for the low oil level protection shutdown, and also designs a reliable condition judgment and shutdown process to ensure that the low oil level protection shutdown process can be correctly executed after the unit enters the no-load state; it ensures that the unit can respond quickly when the oil level in the pressure oil tank is abnormal, automatically cut off the power supply and shut down, effectively preventing mechanical failures and safety hazards caused by too low oil level, and improving the safety and stability of the hydropower station operation.

[0016] 6. The present invention compares the analog values ​​of the two pressure oil tanks in the upper computer monitoring system, and outputs an alarm signal when the difference exceeds the range, effectively ensuring the accuracy and timeliness of oil level monitoring; at the same time, the system also integrates a remote monitoring function, and transmits data in real time through a cloud platform, so that managers can grasp the status of the oil tanks no matter where they are, further improving the efficiency and safety of operation and maintenance; 7. The present invention improves the backup protection shutdown process of the pressure oil tank of the hydro-generator set when it is no longer capable of maintaining the stable operation of the set, protects the safety and stability of the oil system and the speed control system of the set, effectively prevents sudden shutdown accidents caused by abnormal pressure, improves the safety and reliability of the operation of the hydropower station, and provides solid technical support for the stable operation of the power system; 8. The low oil level protection shutdown process designed by the present invention is reliable, and the accident shutdown process can be smoothly carried out after the circuit breaker trips, effectively avoiding the risk of equipment damage caused by too low lubricating oil level. At the same time, the process also has automatic monitoring and early warning functions. Once an abnormal oil level is found, the alarm is activated to ensure that maintenance personnel can intervene in time; 9. The shutdown condition judgment of the present invention is rigorous, and multiple conditions must be met at the same time to trigger the accident shutdown process, which avoids the triggering of the accident shutdown process caused by contact misoperation or damage to one of the pressure oil tank level gauges to the greatest extent, and effectively ensures the stable operation of the equipment; the present invention compares the difference in analog values ​​of two sets of pressure oil tank level gauges through the monitoring system to issue a fault alarm, which can provide early warning of abnormal oil level in the pressure oil tank, facilitate timely processing, and effectively avoid equipment damage and production interruption caused by insufficient or too high oil level; at the same time, the system also has a remote monitoring function, which can transmit data to the central control room in real time to achieve centralized management and rapid response.

[0017] 10. The system of the present invention also has real-time monitoring and self-diagnosis functions. Once a potential problem is found, it can provide early warning and automatic adjustment, further improving the safety and reliability of the equipment; 11. The system of the present invention also has fault self-diagnosis and remote communication functions, which facilitates operation and maintenance personnel to quickly locate problems and conduct remote monitoring and operation, further enhancing the intelligent level of hydropower station operation and emergency response capabilities; 12. The innovative design of the present invention has shown significant advantages in improving the efficiency and safety of hydropower station operation and maintenance. Its intelligent and automated characteristics not only reduce the manual burden, but also provide a solid guarantee for the safe and stable operation of the hydropower station through accurate early warning and immediate response mechanisms. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings and implementation examples: Figure 1 is a schematic diagram of a control system of the present invention; Figure 2 This is a shutdown flow chart of the control method of the present invention. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments: Example 1 like Figure 1~2 As shown in the figure, the control system for low oil level protection shutdown of the oil pressure device of the turbine generator set includes: Two pressure oil tanks, which are connected by a U-shaped pipe to ensure that the oil pressure and oil level are consistent; At least two sets of magnetic flap level gauges are installed on the two pressure oil tank bodies respectively to collect the oil level data in the respective oil tanks; The local control unit LCU of the unit receives the analog signal of the oil level of the pressure oil tank and the switch signal of the oil level limit from the magnetic flap level gauge, and runs the low oil level shutdown control program. When the preset low oil level shutdown conditions are met, a command is sent to the execution device to execute the automatic shutdown process; The monitoring system is used to monitor abnormal oil level in the pressure oil tank and receive alarm signals and shutdown status information from the local control unit of the unit.

[0020] In this embodiment, the two pressure oil tanks include a first pressure oil tank and a second pressure tank, and the first pressure oil tank and the second pressure tank are connected in a U-shaped tube manner to ensure that the oil pressure and oil level are consistent.

[0021] Furthermore, the local control unit LCU of the unit is interconnected with the monitoring system through communication, so as to realize real-time uploading of equipment operation information and issuing of instructions.

[0022] Furthermore, the execution device includes an overspeed solenoid valve arranged on the oil circuit of the turbine guide vane, and a protection device arranged on the local control unit LCU of the unit, and the protection device includes a circuit breaker.

[0023] Example 2 In another preferred embodiment, based on the above-mentioned embodiment 1, the control method of the low oil level protection shutdown of the hydraulic pressure device of the hydraulic generator set is to use the control system of the low oil level protection shutdown of the hydraulic pressure device of the hydraulic generator set described in embodiment 1 to execute the automatic shutdown process, including the following steps: Step 1: Open the overspeed solenoid valve to cut off the oil circuit of the turbine guide vane blades and fully close the guide vane blades; Step 2: Send the accident signal to the protection device, and the protection device trips the circuit breaker after receiving the accident signal; Step 3: If the circuit breaker does not trip, the local control unit LCU of the unit issues a circuit breaker trip command; Step 4: After the circuit breaker trips, execute the process from no-load to shutdown.

[0024] In this embodiment, the unit local control unit LCU also includes: The newly added low oil level shutdown protection link serves as the entry judgment for the low oil level protection shutdown process; The designed condition judgment and shutdown process, after the unit enters the no-load state, if it is detected that the oil level in the pressure oil tank is lower than the preset low oil level limit, the low oil level protection shutdown process will be executed.

[0025] Furthermore, the monitoring system also includes a script for comparing the analog values ​​of the oil levels of the two pressure oil tanks. When the difference between the analog values ​​of the oil levels of the two oil tanks exceeds a preset range, an alarm signal is output to alert operation and maintenance personnel.

[0026] Furthermore, the low oil level shutdown condition includes: The two oil level contacts of the magnetic flap level gauge of the first pressure oil tank will act simultaneously when the oil level is too low or too low; The oil level analog value output by the magnetic flap level gauge of the second pressure oil tank is lower than the preset lower limit value.

[0027] Example 3 In another preferred embodiment, based on the above-mentioned embodiments 1 and 2, the control system for low oil level protection shutdown of the oil pressure device of the hydro-turbine generator set of the present invention includes two pressure oil tank bodies, pressure oil tank oil level measurement sensors (magnetic flap level gauges), unit on-site control units (LCUs) and monitoring systems.

[0028] 1. Pressure oil tank body and oil level measurement This embodiment uses two directly interconnected pressure oil tanks (the first pressure tank and the second pressure tank), which are consistent in terms of material, capacity, etc. Each oil tank body is equipped with a set of magnetic flap level gauges for accurately measuring the oil level in the oil tank. The magnetic flap level gauge not only has the function of liquid level display, but also has a switch limit switch. When the oil level exceeds the preset limit height, the limit switch can output a corresponding switch signal.

[0029] 2. Signal access and data processing The oil level signal of the magnetic flap level gauge of the second pressure tank is directly connected to the local control unit (LCU) of the unit. At the same time, two oil level contacts (oil level too low, oil level ultra-low) are added to the magnetic flap level gauge of the first pressure tank, and the signals of these two contacts are also connected to the LCU. The LCU receives the analog and switch data of the pressure oil tank oil level from the magnetic flap level gauge through its control module, and performs real-time processing and analysis.

[0030] 3. Low oil level shutdown control procedure A new low oil level shutdown protection link is added to the local control unit LCU as the entry judgment condition for the low oil level protection shutdown process. At the same time, a reliable low oil level shutdown control program is designed and written, which can automatically execute the low oil level protection shutdown process according to the preset shutdown conditions after the unit enters the no-load state.

[0031] The shutdown condition is set as follows: when the oil level too low limit switch and the oil level ultra-low limit switch of the magnetic flap level gauge of the first pressure tank are activated at the same time, and the oil level analog value of the magnetic flap level gauge of the second pressure tank is lower than the set lower limit value, the LCU will trigger the low oil level shutdown procedure.

[0032] 4. Shutdown process execution Once the low oil level shutdown condition is met, the local control unit LCU will perform an automatic shutdown operation according to the preset control process. The specific process includes: first, the oil circuit is cut off by controlling the execution device (such as opening the overspeed solenoid valve) to prevent the unit from continuing to run; then, the accident signal is sent to the protection device, and the protection device attempts to trip the circuit breaker. If the circuit breaker fails to trip within the specified time, the LCU will issue a circuit breaker tripping command to ensure that the circuit breaker trips. After the circuit breaker trips, the LCU will execute the no-load-shutdown process to shut down the unit safely.

[0033] 5. Monitoring system and fault alarm The monitoring system communicates with the local control unit LCU to receive and display the oil level data and other related information of the pressure oil tank in real time. In the upper computer monitoring system, the analog values ​​of the first pressure tank and the second pressure tank are compared by writing a script. When the difference between the two exceeds the preset range, the system will output an alarm signal to remind the operation and maintenance personnel to deal with it in time.

[0034] 6. System testing and verification Before the system is officially put into operation, a strict simulation test is required for the newly added low oil level automatic shutdown control program. The correctness and reliability of the control program are verified through simulation signals, program forcing and other methods. This ensures that in abnormal situations such as circuit breaker tripping, the system can smoothly execute the accident shutdown process to protect the safety and stability of the unit.

[0035] Through the detailed description of the above embodiment, the technical solution of the present invention is fully demonstrated. This embodiment not only covers the key links such as real-time monitoring of the oil level of the pressure oil tank, signal processing, shutdown condition judgment and automatic shutdown process execution, but also realizes the early warning and fault alarm functions of oil level abnormality through the monitoring system, providing a strong guarantee for the safe and stable operation of the hydro-turbine generator set.

[0036] In the preferred scheme, the two pressure oil tanks include a first pressure oil tank and a second pressure tank, and the first pressure oil tank and the second pressure tank are connected by a U-shaped tube to ensure that the oil pressure and oil level are consistent; the above setting realizes the stability and efficiency of the pressure oil tank system, and effectively avoids equipment failures caused by oil pressure differences; at the same time, the U-shaped tube design simplifies the pipeline layout, reduces maintenance costs, and improves the operating efficiency of the overall system.

[0037] In the preferred solution, the local control unit LCU of the unit and the monitoring system are interconnected through communication to achieve real-time uploading of equipment operation information and issuing of instructions; the above settings ensure that the monitoring system can quickly respond to changes in equipment status and accurately control the operation of each unit, thereby improving the stability and efficiency of the overall system; at the same time, this communication and interconnection method also facilitates remote monitoring and maintenance, reducing operating costs.

[0038] In the preferred solution, the actuator includes an overspeed solenoid valve arranged on the oil circuit of the turbine guide vane, and a protection device arranged on the local control unit LCU of the unit, and the protection device includes a circuit breaker; with the above arrangement, when the turbine operates abnormally and causes the speed to exceed the preset safety threshold, the overspeed solenoid valve responds quickly, cuts off the oil circuit to reduce the speed, and at the same time, the protection device in the LCU automatically cuts off the power supply through the circuit breaker, thereby achieving double safety protection and ensuring the safe and stable operation of the unit.

[0039] In the preferred scheme, the on-site control unit LCU of the unit also includes: a newly added low oil level shutdown protection link, which serves as the entry judgment of the low oil level protection shutdown process; a designed condition judgment and shutdown process, after the unit enters the no-load state, if it is detected that the oil level in the pressure oil tank is lower than the preset low oil level limit, the low oil level protection shutdown process is executed; the above settings ensure that the unit can respond quickly when the oil level in the pressure oil tank is abnormal, automatically cut off the power supply and shut down, effectively preventing mechanical failures and safety hazards caused by too low oil level, and improving the safety and stability of the hydropower station operation.

[0040] In the preferred solution, the monitoring system also includes a script for comparing the analog values ​​of the oil levels of the two pressure oil tanks. When the difference between the analog values ​​of the oil levels of the two oil tanks exceeds a preset range, an alarm signal is output to alert the operation and maintenance personnel. The above settings effectively ensure the accuracy and timeliness of oil level monitoring. At the same time, the system also integrates a remote monitoring function, which transmits data in real time through a cloud platform, allowing managers to grasp the status of the oil tanks no matter where they are, further improving operation and maintenance efficiency and safety.

[0041] In the preferred scheme, the low oil level shutdown conditions include: the two oil level contacts of the first pressure oil tank magnetic flap level gauge, the oil level is too low and the oil level is extremely low, and they are actuated at the same time; the oil level analog value output by the second pressure oil tank magnetic flap level gauge is lower than the preset lower limit value; the above settings ensure that the system can automatically shut down when the oil level is seriously insufficient, effectively preventing equipment damage caused by insufficient lubrication; in addition, an oil level alarm function is also provided, which issues an early warning when the oil level approaches the lower limit so that the lubricating oil can be replenished in time.

[0042] In summary, the present invention provides a control method for low oil level protection shutdown of the oil pressure device of a hydro-turbine generator set, which solves the problem in the prior art that when the oil-gas ratio is unbalanced, the pressure oil tank cannot provide sufficient oil source for the unit to operate the guide vanes, the wheel blades, and adjust the load even if the pressure is normal but the oil volume is too small, and there is a lack of effective backup protection mechanism, thereby preventing the unit from losing control due to too low oil level and affecting the safe and stable operation of the unit; the present invention adopts the multi-oil tank oil level comprehensive monitoring technology, and the system not only monitors the oil level of a single pressure oil tank, but also compares the oil level of two pressure oil tanks (the first pressure tank and the second pressure tank) The system can monitor the oil level of the pressure tank in real time by using the upper computer monitoring system and the local control unit through the linkage technology. It also realizes remote monitoring and operation through the communication interconnection with the local control unit, which improves the automation level and maintenance efficiency of the system. The system is designed with strict low oil level shutdown conditions. The shutdown process is triggered only when the two oil level limit switches of the first pressure tank and the oil level analog value of the first pressure tank are lower than the set value at the same time, which effectively avoids false operation. The innovative low oil level protection strategy introduces a low oil level shutdown protection mechanism, which fills the gap in the existing technology that the oil-gas ratio is unbalanced but the oil pressure is normal and cannot effectively protect the unit, and provides a new protection strategy; the multi-parameter comprehensive judgment and decision-making of the present invention, the system not only relies on a single oil level parameter for judgment, but also combines multiple means such as oil level comparison of multiple oil tanks, comprehensive analysis of oil level analog and switch data, etc., to improve the accuracy of judgment and the rationality of decision-making; the automation and intelligence of the present invention are improved, through the close cooperation between the local control unit and the host computer monitoring system, the automatic monitoring, abnormal warning and remote operation of the oil level of the pressure oil tank are realized, and the intelligent level of operation and management of the hydropower station is improved; the reliable shutdown process design of the present invention, the low oil level shutdown process designed by the system is reliable, and the accident shutdown process can be smoothly carried out after the circuit breaker trips, effectively preventing the risk of uncontrolled operation of the unit under abnormal conditions; the present invention also has high scalability and compatibility, and can be easily connected to the existing monitoring system of the hydropower station, providing a strong guarantee for the safe and stable operation of the hydropower station, and further promoting the technological progress and intelligent development of the hydropower industry.

Claims

1. The control system for low oil level protection shutdown of the oil pressure device of the hydro-generator set is characterized by: include: Two pressure oil tanks, which are connected by a U-shaped pipe to ensure the consistency of oil pressure and oil level; At least two sets of magnetic flap level gauges, installed on the two pressure oil tank bodies respectively, for collecting oil level data in their respective tanks; The unit's local control unit (LCU) receives analog signals from the magnetic flap level gauge indicating the oil level in the pressure tank and the oil level limit switch signal, and runs a low oil level shutdown control program. When the preset low oil level shutdown conditions are met, it sends a command to the execution device to execute the automatic shutdown process. The monitoring system is used to monitor abnormal oil levels in the pressure oil tank and receive alarm signals and shutdown status information from the local control unit of the unit.

2. The control system for low oil level protection shutdown of the hydraulic pressure device of a hydro-generator set according to claim 1 is characterized in that: The two pressure oil tanks include a first pressure oil tank and a second pressure tank, and the first pressure oil tank and the second pressure tank are connected in a U-shaped tube manner to ensure that the oil pressure and oil level are consistent.

3. The control system for low oil level protection shutdown of the hydraulic pressure device of a hydro-generator set according to claim 2 is characterized in that: The local control unit LCU of the unit is interconnected with the monitoring system to achieve real-time uploading of equipment operation information and issuing of instructions.

4. The control system for low oil level protection shutdown of the hydraulic pressure device of a hydro-generator set according to claim 3 is characterized in that: The execution device includes an overspeed solenoid valve arranged on the oil circuit of the turbine guide vane, and a protection device arranged on the local control unit LCU of the unit, and the protection device includes a circuit breaker.

5. A method for controlling a low oil level protection shutdown of a hydraulic generator set oil pressure device, comprising: using the control system for low oil level protection shutdown of a hydraulic generator set oil pressure device according to any one of claims 1 to 4 to execute an automatic shutdown process, characterized in that: The process includes the following steps: Step 1: Open the overspeed solenoid valve to cut off the oil circuit of the turbine guide vane blades and fully close the guide vane blades; Step 2: Send the accident signal to the protection device, which trips the circuit breaker after receiving the accident signal; Step 3: If the circuit breaker does not trip, the unit's local control unit LCU issues a circuit breaker trip command; Step 4: After the circuit breaker trips, execute the process from no-load to shutdown.

6. The method for controlling the low oil level protection shutdown of the hydraulic device of a hydro-generator set according to claim 5, characterized in that: The unit local control unit LCU also includes: Newly added low oil level shutdown protection link, serving as the entry judgment for the low oil level protection shutdown process; The designed condition judgment and shutdown process, after the unit enters the no-load state, if it is detected that the oil level in the pressure oil tank is lower than the preset low oil level limit, the low oil level protection shutdown process will be executed.

7. The method for controlling the low oil level protection shutdown of the hydraulic device of a hydro-generator set according to claim 6, characterized in that: The monitoring system also includes a script for comparing the oil level analog values ​​of the two pressure oil tanks. When the difference between the oil level analog values ​​of the two oil tanks exceeds a preset range, an alarm signal is output to alert operation and maintenance personnel.

8. The method for controlling the low oil level protection shutdown of the hydraulic device of a hydro-generator set according to claim 7, characterized in that: The low oil level shutdown conditions include: The two oil level contacts of the magnetic flap level gauge of the first pressure oil tank will operate simultaneously when the oil level is too low or too low; The oil level analog value output by the magnetic flap level gauge of the second pressure oil tank is lower than the preset lower limit.

Images