A one-key water filling device and method for a hydraulic turbine unit

Abstract

The application discloses a water turbine unit one-key water filling device and method, which comprises a control system, a touch screen, a pressure stabilizing pipeline, a cooling water direction control pipeline and a pressure relief pipeline. The control system is connected with the touch screen and each pipeline respectively, and is used for collecting operation parameters of a cooling water system and controlling actions of each pipeline; the pressure stabilizing pipeline is arranged in a water supply path and is used for automatically stabilizing pressure and filling water; the cooling water direction control pipeline is arranged in a circulating path and is used for changing a cooling water flow direction; the pressure relief pipeline is communicated with the cooling water system and is used for overpressure protection and pressure relief function detection. According to a one-key starting instruction of the touch screen, the control system sequentially executes valve state detection, pressure relief function detection, automatic water filling and pressure stabilizing and cooling water direction switching processes. The application realizes full automation of a water filling process, and improves water filling efficiency and safety.

Description

Technical Field

[0001] This invention relates to the field of cooling water systems for water turbine units, and in particular to a one-button water filling device and water filling method for water turbine units. Background Technology

[0002] During operation, the generator and main transformer of a hydroelectric turbine unit generate a large amount of heat, which must be dissipated by the continuous circulation of cooling water to ensure the safe operation of the unit within the normal temperature range. The filling of the cooling water system is an indispensable and critical step during the startup of the hydroelectric turbine unit and its restart after maintenance; the quality of this operation directly affects the safety and operating efficiency of the unit.

[0003] Currently, the water filling operation of the turbine unit's cooling water system is mainly completed manually. During the water filling operation, operators need to manually operate the water filling valve in the water supply pipeline, the reversing valve in the circulation pipeline, and the pressure relief valve in the pressure relief pipeline in sequence, based on the readings of the pressure gauges on site, to gradually complete the procedures of filling the pipeline with water, adjusting the pressure, switching the direction, and emptying the system. This traditional manual operation method has the following technical problems.

[0004] First, the water filling process heavily relies on the experience and skill level of the operators. Different operators have different operating habits and judgment standards, resulting in inconsistent water filling quality and efficiency. Especially when filling water for the first time after unit maintenance or restarting the system after a long period of shutdown, operators need to frequently travel between the scattered valves to operate them sequentially. This is not only labor-intensive but also time-consuming, making it difficult to meet the scheduling requirements for rapid unit startup.

[0005] Secondly, during the filling process of the cooling water system, the system pressure needs to be steadily increased from zero to the target working pressure. Existing technologies lack automated, staged pressure regulation methods. Relying on manual and repeated adjustments of the pressure regulating valve opening makes it difficult to balance the pressure increase rate and pressure stability, often resulting in pressure overshoot or large pressure fluctuations, which can impact system pipelines and equipment and pose safety hazards.

[0006] Furthermore, when it is necessary to change the direction of cooling water flow, operators directly switch the directional valve assembly. If the operation sequence is improper or the switching speed is too fast, it can easily lead to cooling water interruption or water hammer effect, damaging valves and pipelines. In addition, as a key component of the system's overpressure protection, the proper functioning of the pressure relief valve is directly related to the system's operational safety. However, current technology lacks self-testing methods for the pressure relief protection function. Operators cannot easily confirm whether the pressure relief valve can open and close normally before water filling and startup, posing a safety hazard. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a one-button water filling device and method for hydroelectric turbine units. To achieve the aforementioned objective, this invention adopts the following technical solution: A one-button water filling device for a hydro turbine unit includes: Control system, touch screen, pressure stabilizing pipeline, cooling water direction control pipeline, and pressure relief pipeline; The control system is connected to the touch screen, pressure stabilizing pipeline, cooling water direction control pipeline and pressure relief pipeline respectively. It is used to collect the operating parameters of the turbine cooling water system and control the operation of the pressure stabilizing pipeline, cooling water direction control pipeline and pressure relief pipeline according to the preset control logic. The touchscreen is used to input control commands to the control system and to display the operating status, valve status, pressure parameters, and alarm information of the turbine cooling water system. The pressure stabilizing pipeline is installed in the water supply path of the turbine cooling water system to adjust the cooling water pressure entering the turbine cooling water system according to the control command of the control system, so as to achieve automatic pressure stabilization and water filling. The cooling water direction control pipeline is installed in the circulation path of the turbine cooling water system and is used to change the flow direction of cooling water according to the control command of the control system. The pressure relief pipeline is connected to the turbine cooling water system and is used to provide overpressure protection for the turbine cooling water system and to test the pressure relief function. Based on the one-button start command input on the touch screen, the control system sequentially executes the valve status detection, pressure relief function detection, automatic water filling and pressure stabilization, and cooling water direction switching processes.

[0008] Furthermore, the control system includes a data acquisition module, a logic control module, and an execution control module; The data acquisition module is connected to the pressure sensor, flow detection device and valve position detection device installed in the turbine cooling water system, respectively, to collect the operating parameters of the cooling water system. The logic control module is used to determine whether the turbine cooling water system meets the water filling operation conditions based on the collected operating parameters. The execution control module is used to control the actuators in the pressure stabilizing pipeline, cooling water direction control pipeline, and pressure relief pipeline according to the judgment results of the logic control module.

[0009] Furthermore, the voltage stabilizing pipeline includes the generator cooling voltage stabilizing branch and the main transformer cooling voltage stabilizing branch; The generator cooling and voltage stabilization branch includes a first pressure regulating valve, a first pressure sensor, and a first electric butterfly valve assembly; The main transformer cooling and voltage stabilization branch includes a second voltage regulating valve, a second pressure sensor, and a second electric butterfly valve assembly. The first and second pressure regulating valves adjust their opening degrees according to the pressure information detected by the corresponding pressure sensors, so as to keep the pressure of the generator cooling system and the main transformer cooling system within a preset range.

[0010] Furthermore, the pressure stabilizing pipeline adopts a staged pressure regulation method; When the pressure sensor detects that the deviation between the cooling water system pressure and the target pressure is greater than the set threshold, the control system controls the first pressure regulating valve or the second pressure regulating valve to operate at the first regulating speed, so that the system pressure quickly approaches the target pressure. When the system pressure reaches the target pressure preset ratio range, the control system controls the first pressure regulating valve or the second pressure regulating valve to act at the second regulating speed to stabilize the system pressure within the target pressure range. The second adjustment speed is less than the first adjustment speed.

[0011] Furthermore, the cooling water direction control pipeline includes the generator cooling commutation branch and the main transformer cooling commutation branch; The generator cooling commutation branch includes a first commutation valve group, which includes a first commutation valve, a second commutation valve, a third commutation valve, and a fourth commutation valve. The cooling commutation branch of the main transformer includes the second commutation valve group; The control system controls the first and second directional valve groups to operate in the order of opening the valve corresponding to the target flow direction and then closing the valve corresponding to the original flow direction, so as to achieve a smooth switching of cooling water direction.

[0012] Furthermore, the control system maintains the current opening of the pressure regulating valve in the pressure stabilizing pipeline during the cooling water direction switching process; When the valve corresponding to the target flow direction is detected to have reached the preset open state, the valve corresponding to the original flow direction is controlled to close. When it is detected that the valve corresponding to the target flow direction is fully open and the valve corresponding to the original flow direction is fully closed, the pressure regulation state of the pressure stabilizing pipeline is restored.

[0013] Furthermore, the pressure relief pipeline includes the generator pressure relief branch and the main transformer pressure relief branch; The generator pressure relief branch includes a first pressure relief valve, a third pressure sensor, and a first pressure relief control valve; The main transformer pressure relief branch includes a second pressure relief valve, a fourth pressure sensor, and a second pressure relief control valve; The control system controls the pressure relief control valve to adjust the inlet pressure of the pressure relief valve, and judges whether the pressure relief protection function is normal based on the opening status of the pressure relief valve.

[0014] According to another aspect of the present invention, a one-button water filling method for a hydro-turbine unit is provided. This method employs a one-button water filling device for the hydro-turbine unit and includes the following steps: Step 1: Valve status detection: Upon receiving the one-button start command, the control system detects the current status of each valve in the turbine cooling water system and determines whether the water filling start conditions are met. Step 2: Pressure Relief Function Test The control system controls the pressure relief pipeline to generate detection pressure and detects whether the pressure relief valve opens and closes according to the preset pressure to confirm the pressure relief protection function; Step 3: Automatic water filling and pressure stabilization: The control system controls the pressure stabilizing pipeline to fill the turbine cooling water system with water, and adjusts the opening of the pressure regulating valve according to the pressure detection results, so that the cooling water system can complete the pressurization and filling. Step 4: Normal cooling operation: The control system controls the cooling water to circulate according to the set flow direction, so that the cooling water can carry away the heat generated by the generator and main transformer during operation; Step 5: Switch the cooling water direction: The control system controls the direction of cooling water and the movement of the pipeline to change the direction of cooling water flow. Furthermore, the pressure relief function test in step two includes: Control the pressure stabilizing pipeline to increase the inlet pressure of the pressure relief valve; Check whether the pressure relief valve opens when the preset operating pressure is reached; Continuously monitor the pressure relief status; Reduce the inlet pressure of the pressure relief valve; Check if the pressure relief valve has returned to the closed position; Determine whether the pressure relief valve is functioning properly based on the test results.

[0015] Furthermore, the cooling water direction switching in step five includes: The valve corresponding to the control target flow direction is opened; The valve opening degree corresponding to the detected target flow direction reaches the preset value; Close the valve corresponding to the original flow direction; The target flow direction valve is fully open and the original flow direction valve is fully closed; Restore pressure regulation control to bring the turbine cooling water system into a stable operating state.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In this invention, a control system is connected to a touchscreen, a pressure stabilizing pipeline, a cooling water direction control pipeline, and a pressure relief pipeline. Based on a one-button start command input via the touchscreen, the control system automatically executes the following processes sequentially: valve status detection, pressure relief function detection, automatic water filling and pressure stabilization, and cooling water direction switching. With this setup, the operator only needs to input a one-button start command via the touchscreen, and the control system automatically completes all procedures of the water filling operation, eliminating the need for manual operation of each valve. This solves the technical problems of inconsistent water filling quality and efficiency, high labor intensity, long operation cycles, and difficulty in meeting the rapid start-up and scheduling requirements of the unit caused by reliance on manual operation in existing technologies.

[0017] 2. In this invention, a staged pressure regulation method is adopted by setting up a pressure-stabilizing pipeline. When the deviation between the system pressure and the target pressure exceeds a set threshold, the control system controls the pressure regulating valve to operate at a relatively fast first adjustment speed, so that the system pressure quickly approaches the target pressure. When the system pressure reaches the target pressure preset ratio range, the control system controls the pressure regulating valve to operate at a slower second adjustment speed, so that the system pressure is stably stabilized within the target pressure range. Under this setting, the pressure can be rapidly increased in the initial stage of water filling to improve water filling efficiency, and the pressure can be slowly adjusted in the later stage to avoid pressure overshoot and system oscillation. Thus, it solves the technical problems in the prior art, such as the lack of automated staged pressure regulation methods, the difficulty in balancing the pressure increase speed and pressure stability due to repeated manual adjustment of the pressure regulating valve opening, and the easy occurrence of pressure overshoot or large pressure fluctuations that can impact the system pipeline and equipment.

[0018] 3. In this invention, by setting the reversing valve group in the cooling water direction control pipeline to operate in the order of first opening the valve corresponding to the target flow direction and then closing the valve corresponding to the original flow direction, at least one flow path is always open during the switching process, avoiding cooling water interruption and water hammer effect caused by simultaneous valve operation. Simultaneously, by maintaining the current opening degree of the pressure regulating valve in the pressure stabilizing pipeline during the cooling water direction switching process, and then restoring the pressure regulation state after the switching is completed, pressure fluctuations and mutual interference caused by simultaneous operation of the pressure regulating valve and the reversing valve are avoided. Furthermore, by setting the pressure relief pipeline to have a self-detection function, it can automatically control the pressure stabilizing pipeline to increase the inlet pressure of the pressure relief valve before water filling and startup, simulating overpressure conditions, and detecting whether the pressure relief valve opens and closes normally according to the preset pressure, thereby confirming the effectiveness of the pressure relief protection function. This solves the technical problems in the existing technology, such as the easy interruption of cooling water flow or water hammer effect caused by direct manual switching of the reversing valve group, the lack of self-testing means for pressure relief protection function which makes it impossible to confirm whether the pressure relief valve is normal before water filling and starting, and the cumbersome manual operation during shutdown and venting which makes it difficult to ensure the balanced release of pressure in all parts of the system. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the overall structure of the one-button water filling device for the turbine unit of the present invention; Figure 2 This is a schematic diagram of the overall structure of the voltage stabilizing pipeline of the present invention; Figure 3 This is a schematic diagram of the overall structure of the cooling water direction control pipeline of the present invention; Figure 4 This is a schematic diagram of the overall structure of the pressure relief pipeline of the present invention; Figure 5 This is a schematic diagram of the overall structure of the control system of the present invention; Figure 6 This is the control flowchart of the present invention.

[0020] In the attached drawings: control system 1, data acquisition module 11, logic control module 12, execution control module 13, touch screen 2, voltage stabilizing pipeline 3, generator cooling voltage stabilizing branch 31, first pressure regulating valve 311, first pressure sensor 312, first electric butterfly valve group 313, main transformer cooling voltage stabilizing branch 32, second pressure regulating valve 321, second pressure sensor 322, second electric butterfly valve group 323, cooling water direction control pipeline 4, generator cooling reversing branch 41, first reversing valve group 411, first reversing valve 411a, second reversing valve 411b 411c (third reversing valve), 411d (fourth reversing valve), 42 (main transformer cooling reversing branch), 421 (second reversing valve group), 5 (pressure relief pipeline), 51 (generator pressure relief branch), 511 (first pressure relief valve), 512 (third pressure sensor), 513 (first pressure relief control valve), 52 (main transformer pressure relief branch), 521 (second pressure relief valve), 522 (fourth pressure sensor), 523 (second pressure relief control valve), 6 (hydro turbine cooling water system), 61 (generator cooling system), 62 (main transformer cooling system), 7 (pressure sensor), 8 (flow detection device), 9 (valve position detection device). Detailed Implementation

[0021] To better understand the purpose, structure, and function of this invention, the following detailed description of a one-button water filling device for a water turbine unit and its control method, in conjunction with the accompanying drawings, is provided.

[0022] For convenience, the direction of cooling water flow along the water supply path is referred to as "forward" or similar term, the opposite direction is referred to as "reverse" or similar term, the process of increasing cooling water system pressure is referred to as "pressure increase" or similar term, the process of decreasing cooling water system pressure is referred to as "pressure release" or similar term, the state of all valves being fully open is referred to as "fully open" or similar term, and the state of all valves being fully closed is referred to as "fully closed" or similar term.

[0023] like Figure 1 As shown, one embodiment of the present invention provides a one-button water filling device for a hydro-turbine unit, including a control system 1, a touch screen 2, a pressure stabilizing pipeline 3, a cooling water direction control pipeline 4, and a pressure relief pipeline 5. The control system 1 is connected to the touch screen 2, the pressure stabilizing pipeline 3, the cooling water direction control pipeline 4, and the pressure relief pipeline 5 respectively, and is used to collect operating parameters of the hydro-turbine unit's cooling water system 6, and control the operation of the pressure stabilizing pipeline 3, the cooling water direction control pipeline 4, and the pressure relief pipeline 5 according to preset control logic.

[0024] like Figure 1 As shown, the touchscreen 2 is used to input control commands to the control system 1 and display the operating status, valve status, pressure parameters, and alarm information of the turbine cooling water system 6. The pressure stabilizing pipeline 3 is installed in the water supply path of the turbine cooling water system 6 and is used to adjust the cooling water pressure entering the turbine cooling water system 6 according to the control commands of the control system 1 to achieve automatic pressure stabilization and water filling.

[0025] like Figure 1 As shown, the cooling water direction control pipeline 4 is installed in the circulation path of the turbine cooling water system 6, and is used to change the flow direction of the cooling water according to the control command of the control system 1. The pressure relief pipeline 5 is connected to the turbine cooling water system 6, and is used to provide overpressure protection for the turbine cooling water system 6, and to detect the pressure relief function.

[0026] In this configuration, when in use, the pressure stabilizing pipeline 3 is connected to the water supply path of the turbine cooling water system 6, the cooling water direction control pipeline 4 is connected to the circulation path of the turbine cooling water system 6, and the pressure relief pipeline 5 is connected to the turbine cooling water system 6.

[0027] Simultaneously, the control system 1 is connected to the touch screen 2, the pressure stabilizing pipeline 3, the cooling water direction control pipeline 4, and the pressure relief pipeline 5. This completes the assembly of the one-button water filling device for the turbine unit. Then, a one-button start command is input to the control system 1 via the touch screen 2. At this time, the control system 1, based on the one-button start command input via the touch screen 2, sequentially executes the valve status detection, pressure relief function detection, automatic water filling and pressure stabilization, and cooling water direction switching processes.

[0028] In one embodiment, such as Figure 1 As shown, the control system 1 includes a data acquisition module 11, a logic control module 12, and an execution control module 13. The data acquisition module 11 is connected to the pressure sensor 7, the flow detection device 8, and the valve position detection device 9 installed in the turbine cooling water system 6, respectively, and is used to collect the operating parameters of the cooling water system.

[0029] like Figure 1As shown, the logic control module 12 is used to determine whether the turbine cooling water system 6 meets the water filling operation conditions based on the collected operating parameters. The execution control module 13 is used to control the actuators in the pressure stabilizing pipeline 3, the cooling water direction control pipeline 4, and the pressure relief pipeline 5 according to the judgment result of the logic control module 12.

[0030] In this way, the data acquisition module 11 can acquire key parameters of the cooling water system in real time, such as pressure, flow rate, and valve status, and transmit the acquired operating parameters to the logic control module 12. The logic control module 12 analyzes and judges these parameters and transmits the judgment results to the execution control module 13. The execution control module 13 drives the actions of each actuator according to the judgment results, thereby achieving precise control of the water filling process.

[0031] In one embodiment, such as Figure 2 As shown, the voltage stabilizing pipeline 3 includes a generator cooling voltage stabilizing branch 31 and a main transformer cooling voltage stabilizing branch 32. The generator cooling voltage stabilizing branch 31 includes a first pressure regulating valve 311, a first pressure sensor 312, and a first electric butterfly valve assembly 313. The main transformer cooling voltage stabilizing branch 32 includes a second pressure regulating valve 321, a second pressure sensor 322, and a second electric butterfly valve assembly 323. The first pressure regulating valve 311 and the second pressure regulating valve 321 adjust their valve openings according to the pressure information detected by their respective pressure sensors, so that the pressures of the generator cooling system 61 and the main transformer cooling system 62 are maintained within a preset range.

[0032] In this configuration, the first pressure sensor 312 detects the pressure of the generator cooling system 61 in real time and transmits the detected pressure signal to the control system 1. The control system 1 compares this signal with a preset target pressure. When there is a deviation between the detected pressure and the target pressure, the control system 1 controls the first pressure regulating valve 311 to adjust the valve opening, thereby regulating the cooling water pressure entering the generator cooling system 61.

[0033] Similarly, such as Figure 2 As shown, the second pressure sensor 322 detects the pressure of the main transformer cooling system 62 in real time. The control system 1 controls the second pressure regulating valve 321 to adjust the valve opening according to the signal, thereby adjusting the cooling water pressure entering the main transformer cooling system 62.

[0034] In one embodiment, such as Figure 2 As shown, the pressure regulating pipeline 3 adopts a staged pressure regulation method. When the pressure sensor detects that the deviation between the cooling water system pressure and the target pressure is greater than the set threshold, the control system 1 controls the first pressure regulating valve 311 or the second pressure regulating valve 321 to operate at a first regulating speed, so that the system pressure quickly approaches the target pressure.

[0035] Once the system pressure reaches the target pressure preset ratio range, the control system 1 controls the first pressure regulating valve 311 or the second pressure regulating valve 321 to operate at a second regulating speed, thereby stabilizing the system pressure within the target pressure range. The second regulating speed is less than the first regulating speed.

[0036] In this way, during the initial stage of water filling, when the system pressure deviates significantly from the target pressure, the pressure regulating valve operates at a relatively fast initial adjustment speed, causing the system pressure to rise rapidly, thereby shortening the filling time and improving filling efficiency. Once the system pressure approaches the target pressure, the pressure regulating valve switches to a slower second adjustment speed. At this point, the valve adjusts slowly, effectively avoiding pressure overshoot and system oscillation caused by excessively rapid adjustment, ensuring the system pressure remains stable within the target pressure range. Thus, both filling efficiency and system stability are balanced.

[0037] In one embodiment, such as Figure 3 As shown, the cooling water direction control pipeline 4 includes a generator cooling reversing branch 41 and a main transformer cooling reversing branch 42. The generator cooling reversing branch 41 includes a first reversing valve group 411, which comprises a first reversing valve 411a, a second reversing valve 411b, a third reversing valve 411c, and a fourth reversing valve 411d. The main transformer cooling reversing branch 42 includes a second reversing valve group 421. The control system 1 controls the first reversing valve group 411 and the second reversing valve group 421 to operate in the sequence of first opening the valve corresponding to the target flow direction and then closing the valve corresponding to the original flow direction, thereby achieving a smooth switching of the cooling water direction.

[0038] Specifically, when it is necessary to switch the cooling water from forward to reverse, the control system 1 first controls the valve corresponding to the target flow direction (i.e., reverse) to open, so that the reverse passage is gradually opened. After detecting that the valve corresponding to the target flow direction has reached the preset opening state, the control system 1 then controls the valve corresponding to the original flow direction (i.e., forward) to close.

[0039] This "open first, close later" switching sequence ensures that at least one flow path remains open during the switching process, preventing cooling water interruption and guaranteeing continuous operation of the turbine cooling water system. Simultaneously, this switching sequence avoids pressure surges caused by simultaneous valve operation, protecting pipelines and equipment from water hammer damage.

[0040] In one embodiment, such as Figure 5 As shown, during the cooling water direction switching process, control system 1 maintains the current opening degree of the pressure regulating valve in pressure stabilizing pipeline 3. When it detects that the valve corresponding to the target flow direction has reached the preset open state, it controls the valve corresponding to the original flow direction to close. When it detects that the valve corresponding to the target flow direction is fully open and the valve corresponding to the original flow direction is fully closed, it restores the pressure regulation state of pressure stabilizing pipeline 3.

[0041] In this way, during the cooling water direction switching process, the pressure regulating valve maintains its current opening, avoiding pressure fluctuations and mutual interference caused by the simultaneous operation of the pressure regulating valve and the reversing valve. After the reversing valve group has completed the switching and the system has entered a stable state, the normal pressure regulating function of the pressure regulating valve is restored, thereby further ensuring the smoothness of the switching process and improving the reliability of system operation.

[0042] In one embodiment, such as Figure 4 As shown, the pressure relief pipeline 5 includes a generator pressure relief branch 51 and a main transformer pressure relief branch 52. The generator pressure relief branch 51 includes a first pressure relief valve 511, a third pressure sensor 512, and a first pressure relief control valve 513. The main transformer pressure relief branch 52 includes a second pressure relief valve 521, a fourth pressure sensor 522, and a second pressure relief control valve 523. The control system 1 controls the pressure relief control valve to adjust the inlet pressure of the pressure relief valve and determines whether the pressure relief protection function is normal based on the opening status of the pressure relief valve.

[0043] In this configuration, such as Figure 4 As shown, the third pressure sensor 512 detects the pressure of the generator pressure relief branch 51 in real time, and the fourth pressure sensor 522 detects the pressure of the main transformer pressure relief branch 52 in real time. When the cooling water system pressure exceeds the preset safety threshold, the control system 1 controls the first pressure relief control valve 513 or the second pressure relief control valve 523 to operate, thereby increasing the pressure at the inlet of the pressure relief valve.

[0044] When the inlet pressure of the pressure relief valve reaches the preset operating pressure, the pressure relief valve opens, discharging some of the cooling water from the system, thereby reducing the system pressure and providing overpressure protection. When the system pressure drops below the safe value, control system 1 controls the pressure relief control valve to reset, the inlet pressure of the pressure relief valve decreases, and the pressure relief valve returns to the closed state.

[0045] According to a preferred embodiment of the present invention, such as Figure 4 As shown, the pressure relief pipeline 5 also has a self-detection function. Specifically, the control system 1 can periodically or before each water filling start-up control the pressure stabilizing pipeline 3 to increase the inlet pressure of the pressure relief valve to simulate an overpressure condition. During this process, the control system 1 detects whether the pressure relief valve opens when the preset operating pressure is reached.

[0046] After confirming that the pressure relief valve is open normally, the control system 1 continuously monitors the pressure relief status, then reduces the inlet pressure of the pressure relief valve and checks whether the pressure relief valve returns to the closed state. If the pressure relief valve can open and close normally according to the preset pressure, the pressure relief protection function is judged to be normal; if the pressure relief valve fails to open at the preset operating pressure, or fails to close normally after opening, the control system 1 issues an alarm message through the touch screen 2 to remind the operator to perform maintenance.

[0047] According to a preferred embodiment of the present invention, such as Figure 5 As shown, touchscreen 2 is an industrial touchscreen with a human-machine interface. Operators can input control commands such as one-button start commands and parameter setting commands to control system 1 via touchscreen 2. Simultaneously, touchscreen 2 displays the real-time operating status of the turbine cooling water system 6, the on / off status of each valve, system pressure parameters, and various alarm information. In this way, operators can intuitively understand the system's operating status and promptly obtain alarm information when abnormalities occur, facilitating rapid response and handling.

[0048] According to a preferred embodiment of the present invention, such as Figure 6 As shown, the specific process executed by control system 1 according to the one-key start command input by touch screen 2 is as follows.

[0049] In the valve status detection process, control system 1 uses valve position detection device 9 to detect the current status of each valve in the turbine cooling water system 6 and determines whether the water filling start-up conditions are met. Specifically, control system 1 detects whether each water filling valve is closed, each drain valve is closed, each directional valve is in its set position, and each pressure relief valve is closed. If all valves are in the correct initial state, the water filling start-up conditions are met, and the process proceeds to the next step. If any valve status is abnormal, control system 1 issues an alarm message via touchscreen 2 and terminates the water filling process.

[0050] In the pressure relief function testing process, control system 1 controls pressure relief pipeline 5 to generate test pressure and checks whether the pressure relief valve opens and closes according to the preset pressure to confirm the pressure relief protection function. More specifically, control system 1 first controls pressure stabilizing pipeline 3 to increase the inlet pressure of the pressure relief valve, so that the inlet pressure of the pressure relief valve gradually increases.

[0051] During this process, control system 1 detects whether the pressure relief valve opens when the preset operating pressure is reached. Once the pressure relief valve is detected to be open, control system 1 continuously monitors the pressure relief status to confirm that the valve remains open. Subsequently, control system 1 controls the pressure stabilizing pipeline 3 to reduce the inlet pressure of the pressure relief valve and detects whether the valve returns to the closed state. If the pressure relief valve can open and close normally according to the preset pressure, the pressure relief protection function is considered normal, and the process proceeds to the next step; if the pressure relief function is abnormal, control system 1 issues an alarm message via touchscreen 2 and terminates the water filling process.

[0052] In the automatic water filling and pressure stabilization process, the control system 1 controls the pressure stabilization pipeline 3 to fill the turbine cooling water system 6 with water, and adjusts the opening of the pressure regulating valve according to the pressure detection results, so that the cooling water system can complete the pressure increase and water filling.

[0053] During the water filling process, the pressure stabilizing pipeline 3 adopts the aforementioned staged pressure regulation method. When the deviation between the system pressure and the target pressure exceeds the set threshold, the pressure regulating valve quickly activates at the first regulation speed, causing the system pressure to rapidly approach the target pressure.

[0054] Once the system pressure reaches the preset target pressure range, the pressure regulating valve switches to the second regulating speed and operates slowly, ensuring the system pressure stabilizes smoothly within the target pressure range. Once the system pressure reaches the target pressure and stabilizes, the automatic water filling and pressure stabilization process is complete.

[0055] During normal cooling operation, control system 1 controls the cooling water to circulate according to a set direction, so that the cooling water carries away the heat generated during the operation of the generator and main transformer. At this time, the turbine cooling water system 6 is in normal operation.

[0056] In the cooling water direction switching process, control system 1 controls the cooling water direction control pipeline 4 to change the cooling water flow direction. Specifically, control system 1 first controls the valve corresponding to the target flow direction to open and monitors the opening degree of the valve corresponding to the target flow direction in real time. When the opening degree of the valve corresponding to the target flow direction is detected to reach a preset value, control system 1 controls the valve corresponding to the original flow direction to close.

[0057] Subsequently, control system 1 continuously monitors whether the target flow direction valve is fully open and whether the original flow direction valve is fully closed. Once it is confirmed that the target flow direction valve is fully open and the original flow direction valve is fully closed, control system 1 resumes pressure regulation control, enabling the turbine cooling water system to enter a stable operating state. During the cooling water direction switching process, control system 1 maintains the current opening of the pressure regulating valve in the pressure stabilizing pipeline 3, and resumes pressure regulation only after the reversal is completed.

[0058] According to a preferred embodiment of the present invention, all of the above-mentioned valves are electric valves and are uniformly controlled by the control system 1. Meanwhile, all of the above-mentioned pressure sensors are industrial pressure transmitters, capable of converting the detected pressure signals into standard electrical signals and transmitting them to the control system 1.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A one-button water filling device for a hydro-turbine unit, characterized in that, include: Control system (1), touch screen (2), pressure stabilizing pipeline (3), cooling water direction control pipeline (4), and pressure relief pipeline (5); The control system (1) is connected to the touch screen (2), the pressure stabilizing pipeline (3), the cooling water direction control pipeline (4) and the pressure relief pipeline (5) respectively, and is used to collect the operating parameters of the turbine cooling water system (6) and control the operation of the pressure stabilizing pipeline (3), the cooling water direction control pipeline (4) and the pressure relief pipeline (5) according to the preset control logic. The touch screen (2) is used to input control commands to the control system (1) and display the operating status, valve status, pressure parameters and alarm information of the turbine cooling water system (6); The pressure stabilizing pipeline (3) is installed in the water supply path of the turbine cooling water system (6) to adjust the cooling water pressure entering the turbine cooling water system (6) according to the control command of the control system (1) so as to realize automatic pressure stabilization and water filling. The cooling water direction control pipeline (4) is installed in the circulation path of the turbine cooling water system (6) and is used to change the cooling water flow direction according to the control command of the control system (1); The pressure relief pipeline (5) is connected to the turbine cooling water system (6) and is used to protect the turbine cooling water system (6) from overpressure and to test the pressure relief function. The control system (1) executes the valve status detection, pressure relief function detection, automatic water filling and pressure stabilization, and cooling water direction switching processes in sequence according to the one-key start command input by the touch screen (2).

2. The one-button water filling device for a water turbine unit according to claim 1, characterized in that, The control system (1) includes a data acquisition module (11), a logic control module (12), and an execution control module (13). The data acquisition module (11) is connected to the pressure sensor (7), flow detection device (8) and valve position detection device (9) installed in the turbine cooling water system (6) respectively, and is used to collect the operating parameters of the cooling water system; The logic control module (12) is used to determine whether the turbine cooling water system (6) meets the water filling operation conditions based on the collected operating parameters; The execution control module (13) is used to control the actuators in the pressure stabilizing pipeline (3), cooling water direction control pipeline (4) and pressure relief pipeline (5) according to the judgment result of the logic control module (12).

3. The one-button water filling device for a water turbine unit according to claim 1, characterized in that, The voltage stabilizing pipeline (3) includes the generator cooling voltage stabilizing branch (31) and the main transformer cooling voltage stabilizing branch (32). The generator cooling and voltage stabilizing branch (31) includes a first pressure regulating valve (311), a first pressure sensor (312), and a first electric butterfly valve group (313). The main transformer cooling and voltage stabilizing branch (32) includes a second pressure regulating valve (321), a second pressure sensor (322), and a second electric butterfly valve group (323). The first pressure regulating valve (311) and the second pressure regulating valve (321) adjust the valve opening according to the pressure information detected by the corresponding pressure sensor, so as to keep the pressure of the generator cooling system (61) and the main transformer cooling system (62) within the preset range.

4. The one-button water filling device for a water turbine unit according to claim 3, characterized in that, The pressure stabilizing pipeline (3) adopts a staged pressure regulation method; When the pressure sensor detects that the deviation between the cooling water system pressure and the target pressure is greater than the set threshold, the control system (1) controls the first pressure regulating valve (311) or the second pressure regulating valve (321) to operate at the first regulating speed so that the system pressure quickly approaches the target pressure. When the system pressure reaches the target pressure preset ratio range, the control system (1) controls the first pressure regulating valve (311) or the second pressure regulating valve (321) to operate at the second regulating speed to stabilize the system pressure within the target pressure range; The second adjustment speed is less than the first adjustment speed.

5. The one-button water filling device for a water turbine unit according to claim 1, characterized in that, The cooling water direction control pipeline (4) includes the generator cooling reversing branch (41) and the main transformer cooling reversing branch (42). The generator cooling commutation branch (41) includes a first commutation valve group (411), which includes a first commutation valve (411a), a second commutation valve (411b), a third commutation valve (411c), and a fourth commutation valve (411d). The main transformer cooling commutation branch (42) includes the second commutation valve group (421). The control system (1) controls the first reversing valve group (411) and the second reversing valve group (421) to operate in the order of first opening the valve corresponding to the target flow direction and then closing the valve corresponding to the original flow direction, so as to achieve a smooth switching of cooling water direction.

6. The one-button water filling device for a water turbine unit according to claim 5, characterized in that, During the process of switching the cooling water direction, the control system (1) maintains the current opening of the pressure regulating valve of the pressure stabilizing pipeline (3); When the valve corresponding to the target flow direction is detected to have reached the preset open state, the valve corresponding to the original flow direction is controlled to close. When it is detected that the valve corresponding to the target flow direction is fully open and the valve corresponding to the original flow direction is fully closed, the pressure regulation state of the pressure regulating pipeline (3) is restored.

7. The one-button water filling device for a water turbine unit according to claim 1, characterized in that, The pressure relief pipeline (5) includes the generator pressure relief branch (51) and the main transformer pressure relief branch (52). The generator pressure relief branch (51) includes a first pressure relief valve (511), a third pressure sensor (512), and a first pressure relief control valve (513). The main transformer pressure relief branch (52) includes a second pressure relief valve (521), a fourth pressure sensor (522), and a second pressure relief control valve (523); The control system (1) controls the pressure relief control valve to adjust the pressure relief valve inlet pressure, and judges whether the pressure relief protection function is normal based on the opening status of the pressure relief valve.

8. A one-button water filling method for a hydro-turbine unit, characterized in that, The one-button water filling device according to any one of claims 1-7 includes the following steps: Step 1: Valve status detection: After receiving the one-key start command, the control system (1) detects the current status of each valve in the turbine cooling water system (6) and determines whether the water filling start condition is met. Step 2: Pressure Relief Function Test The control system (1) controls the pressure relief pipeline (5) to generate detection pressure and detects whether the pressure relief valve opens and closes according to the preset pressure to confirm the pressure relief protection function; Step 3: Automatic water filling and pressure stabilization: The control system (1) controls the pressure stabilizing pipeline (3) to fill the turbine cooling water system (6) with water, and adjusts the opening of the pressure regulating valve according to the pressure detection result so that the cooling water system can complete the pressurization and water filling. Step 4: Normal cooling operation: The control system (1) controls the cooling water to circulate in a set direction so that the cooling water can carry away the heat generated by the generator and the main transformer during operation; Step 5: Switch the cooling water direction: The control system (1) controls the direction of cooling water control pipeline (4) to change the direction of cooling water flow.

9. A one-button water filling method for a hydro-turbine unit according to claim 8, characterized in that, Step two, the pressure relief function test, includes: Control the pressure stabilizing pipeline (3) to increase the inlet pressure of the pressure relief valve; Check whether the pressure relief valve opens when the preset operating pressure is reached; Continuously monitor the pressure relief status; Reduce the inlet pressure of the pressure relief valve; Check if the pressure relief valve has returned to the closed position; Determine whether the pressure relief valve is functioning properly based on the test results.

10. A one-button water filling method for a turbine unit according to claim 8, characterized in that, Step five, the cooling water direction switching, includes: The valve corresponding to the control target flow direction is opened; The valve opening degree corresponding to the detected target flow direction reaches the preset value; Close the valve corresponding to the original flow direction; The target flow direction valve is fully open and the original flow direction valve is fully closed; Restore pressure regulation control to bring the turbine cooling water system into a stable operating state.

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