Timing device and steam turbine testing system
The timing device directly receives the valve closing signal and feedback signal, which solves the problem of large timing errors in the steam control valve closing time in the steam turbine control system, and achieves a more accurate timing effect.
Patent Information
- Application Number
- CN202422159846.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-09-03
AI Technical Summary
In the prior art, when the controller of the steam turbine control system performs the closing time of the steam regulating valve, due to the influence of the calculation cycle of the software program, the timing error is large and it is difficult to accurately count.
The timing device is adopted to directly receive the valve shutdown signal and feedback signal through the first signal receiving circuit, the second signal receiving circuit and the timer to generate the timing start and end signals, avoid the impact of the calculation cycle during the software program processing process, and improve the timing accuracy.
Accurate timing of the closing time of the steam regulating valve is realized, which reduces timing errors and improves the accuracy and practicality of the timing device.
Smart Images
Figure CN223296291U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of equipment testing, in particular to a timing device and a steam turbine testing system. Background Art
[0002] In a steam turbine, the speed of the steam control valve's opening and closing times directly affects the turbine's power regulation response speed. Especially under abnormal operating conditions, a prolonged closing time of the steam control valve may cause the turbine to maintain high power operation for a period of time while the valve is closed, resulting in turbine rotor overspeed. Therefore, when testing a steam turbine's steam control valve, it is particularly important to measure its closing time.
[0003] Current techniques typically use software programs within the turbine control system to time the closing time of a steam control valve. However, when the controller or processor of the turbine control system executes the software program, the computational cycle of the software program makes it difficult for the controller to accurately time the closing time of the steam control valve. Consequently, significant errors are often present in this method. Therefore, a new timing device is urgently needed to accurately time the closing time of a steam control valve. Utility Model Content
[0004] In view of this, the present application provides a timing device that can timely collect valve closing signals and feedback signals through hardware such as a first signal receiving circuit and a second signal receiving circuit, and generate a timing start electrical signal and a timing end electrical signal for controlling the timing of the timer without executing a software program. This can avoid the influence of the operation cycle during software processing, thereby improving the accuracy of the timing start and timing end of the control timer, and can more accurately time the closing time of the steam regulating valve.
[0005] According to a first aspect of an embodiment of the present application, an embodiment of the present application provides a timing device for timing the closing time of a steam regulating valve of a steam turbine; the steam regulating valve is connected to a controller of the steam turbine, and an opening feedback module is provided in the steam regulating valve; the controller is configured to output a valve closing signal to the controller to trigger the steam regulating valve to perform a closing action through the valve closing signal; the opening feedback module is configured to detect the opening of the steam regulating valve and output a feedback signal indicating the opening of the steam regulating valve; the timing device includes: a first signal receiving circuit, a second signal receiving circuit and a timer; the first signal receiving circuit is respectively connected to the output end of the timer and the controller, and the timer is respectively connected to the output end of the timer The second signal receiving circuit is connected to the input end of the controller, and the second signal receiving circuit is connected to the opening feedback module; the first signal receiving circuit is configured to send a timing start electrical signal to the timer when receiving the valve closing signal output by the controller; the second signal receiving circuit is configured to determine whether the steam regulating valve is closed based on the feedback signal when receiving the feedback signal output by the opening feedback module; if it is determined that the steam regulating valve is closed, a timing end electrical signal is sent to the timer; the timer is configured to start timing when receiving the timing start electrical signal; end timing when receiving the timing end electrical signal, and output a timing signal indicating the timing duration to the controller.
[0006] In one possible implementation, the valve closing signal includes a first valve closing signal and a second valve closing signal, the output end of the controller includes a first port and a second port, and the timing device also includes: a signal receiving circuit connected to the first signal receiving circuit; the signal receiving circuit is connected to the first port and the second port respectively; the signal receiving circuit is configured to transmit the first valve closing signal to the first signal receiving circuit when receiving the first valve closing signal output by the controller through the first port; and transmit the second valve closing signal to the first signal receiving circuit when receiving the second valve closing signal output by the controller through the second port; wherein, the first valve closing signal is a signal output by the controller to instruct the steam regulating valve to perform a closing action when the steam turbine is operating normally, and the second valve closing signal is a signal output by the controller to instruct the steam regulating valve to perform a closing action when the steam turbine trips.
[0007] In one possible implementation, the timing device also includes: a test switch; one end of the test switch is connected to the signal receiving circuit, and the other end of the test switch is connected to the first signal receiving circuit; the signal receiving circuit is configured to transmit the first valve closing signal to the first signal receiving circuit through the test switch when the test switch is closed, or to transmit the second valve closing signal to the first signal receiving circuit through the test switch.
[0008] In one possible implementation, the feedback signal is a current signal, and the feedback signal with different current values indicates different openings of the steam regulating valve; the second signal receiving circuit is configured to compare the feedback signal with the closing current; and when the current value of the feedback signal is less than or equal to the current value of the closing current, it is judged that the steam regulating valve is closed; when the current value of the feedback signal is greater than the current value of the closing current, it is judged that the steam regulating valve is not closed.
[0009] In a possible implementation, when the current value of the feedback signal is equal to the current value of the closing current, the opening degree of the steam regulating valve indicated by the feedback signal is N, and 0.3%≤N≤0.7%.
[0010] The present application also provides a steam regulating valve closing time testing system, comprising: a controller, an opening feedback module and a timing device described in any of the above embodiments; the controller is connected to the timing device, and the timing device is connected to the opening feedback module.
[0011] In an embodiment of the present application, the timing device includes a first signal receiving circuit, a second signal receiving circuit, and a timer. The first signal receiving circuit is connected to the output end of the timer and the controller respectively, the timer is connected to the input end of the second signal receiving circuit and the controller respectively, and the second signal receiving circuit is connected to the opening feedback module. The first signal receiving circuit can send a timing start electrical signal to the timer when receiving the valve closing signal output by the controller; the second signal receiving circuit can determine whether the steam control valve is closed based on the feedback signal when receiving the feedback signal output by the opening feedback module; and when the judgment result is that the steam control valve is closed, it can send a timing end electrical signal to the timer. The timer can start timing when it receives the timing start electrical signal, end timing when it receives the timing end electrical signal, and output a timing signal to the controller for indicating the timing duration. The timing duration can indicate the closing time of the steam control valve, so that the controller records the closing time of the steam control valve as the timing duration. This timing device can timely receive the valve closing signal and feedback signal through hardware such as the first signal receiving circuit and the second signal receiving circuit, and generate the timing start electrical signal and the timing end electrical signal for the control timer timing without executing the software program. It can avoid the influence of the operation cycle in the software processing process, thereby improving the accuracy of the timing start and timing end of the control timer, and can more accurately time the closing time of the steam control valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a structural diagram of a timing device provided in an optional embodiment of the present application;
[0013] Figure 2 is a structural diagram of another timing device provided in an optional embodiment of the present application;
[0014] Figure 3 This is a structural diagram of another timing device provided in an optional embodiment of the present application.
[0015] Figure 4 It is a structural schematic diagram of a steam control valve closing time testing system provided in an optional embodiment of the present application.
[0016] List of reference numerals:
[0017] DETAILED DESCRIPTION
[0018] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.
[0019] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. "First", "second", etc. are only used to distinguish each other, rather than to indicate their importance and order, etc. "Parallel", "perpendicular", etc. are not strict mathematical and / or geometric limitations, but also include errors that can be understood by those skilled in the art and are allowed in manufacturing or use.
[0020] As previously mentioned, current technologies typically use a steam turbine control system to time the closing time of a steam control valve. However, when the processor of the steam turbine control system executes the software program that timers the closing time of the steam control valve, the controller's computational cycle affects the software program's execution, making it difficult for these technologies to accurately time the closing time of the steam control valve. Consequently, timing the closing time of the steam control valve using the steam turbine control system is prone to significant errors. Therefore, a new timing device is urgently needed to accurately time the closing time of the steam control valve.
[0021] In an embodiment of the present application, a new timing device is provided, which includes a first signal receiving circuit, a second signal receiving circuit, and a timer. The first signal receiving circuit is connected to the output end of the timer and the controller respectively, the timer is connected to the input end of the second signal receiving circuit and the controller respectively, and the second signal receiving circuit is connected to the opening feedback module. The first signal receiving circuit can send a timing start electrical signal to the timer when it receives the valve closing signal output by the controller; the second signal receiving circuit can determine whether the steam control valve is closed based on the feedback signal when it receives the feedback signal output by the opening feedback module; and when the judgment result is that the steam control valve is closed, it can send a timing end electrical signal to the timer. The timer can start timing when it receives the timing start electrical signal, end timing when it receives the timing end electrical signal, and output a timing signal to the controller for indicating the timing duration. The timing duration can indicate the closing time of the steam control valve, so that the controller records the closing time of the steam control valve as the timing duration. This timing device can timely receive the valve closing signal and feedback signal through hardware such as the first signal receiving circuit and the second signal receiving circuit, and generate the timing start electrical signal and the timing end electrical signal for the control timer timing without executing the software program. It can avoid the influence of the operation cycle in the software processing process, thereby improving the accuracy of the timing start and timing end of the control timer, and can more accurately time the closing time of the steam control valve.
[0022] It should be noted that the various drawings in the specification of this application are only used to facilitate the explanation and understanding of this embodiment, and are not intended to be any limitation to this application. They are not necessarily drawn according to the actual scale.
[0023] The following is combined with Figure 1-3 The timing device 100 provided in an embodiment of the present application is described in detail.
[0024] Figure 1 1 is a structural diagram of a timing device 100 provided in an embodiment of the present application. The timing device 100 is mainly used to time the closing time of a steam regulating valve of a steam turbine.
[0025] The steam control valve of the steam turbine can be connected to the steam turbine controller 210. The controller 210 can be a controller 210 in the steam turbine control system that controls the opening and closing of the steam control valve. The steam control valve can also be provided with an opening feedback module 220. The controller 210 is configured to output a valve closing signal to the controller 210, thereby triggering the steam control valve to close via the valve closing signal. The opening feedback module 220 is configured to detect the opening of the steam control valve and output a feedback signal indicating the opening of the steam control valve.
[0026] like Figure 1 As shown, the first signal receiving circuit 110 is connected to the timer 130 and the output end 211 of the controller 210 respectively, the timer 130 is connected to the second signal receiving circuit 120 and the input end 212 of the controller 210 respectively, and the second signal receiving circuit 120 is connected to the opening feedback module 220.
[0027] The first signal receiving circuit 110 is configured to send a timing start electrical signal to the timer 130 upon receiving the valve closing signal output by the controller 210 , where the timing start electrical signal is used to trigger the timer 130 to start timing.
[0028] The second signal receiving circuit 120 is configured to, upon receiving the feedback signal output by the opening feedback module 220, determine whether the steam control valve is closed based on the feedback signal. If the steam control valve is determined to be closed, the second signal receiving circuit 120 sends a timing end electrical signal to the timer 130, which triggers the timer 130 to end timing. If the steam control valve is determined to be open, the second signal receiving circuit 120 does not send the timing end electrical signal to the timer 130.
[0029] A steam control valve is typically provided with an opening feedback module 220 for detecting the opening of the steam control valve. For example, the opening feedback module 220 may include a displacement sensor to detect the movement of the valve core of the steam control valve. Based on the movement of the valve core, the opening of the steam control valve is detected, and a feedback signal indicating the opening of the steam control valve is output to the second signal receiving circuit 120. After receiving the feedback signal output by the opening feedback module 220, the second signal receiving circuit 120 may send an electrical time-out signal to the timer 130 when the feedback signal indicates that the steam control valve is closed.
[0030] The valve closing signal can be an electrical signal with a voltage of 24V. The first signal receiving circuit 110 can include an I / O (Input / Output) device, thereby receiving the valve closing signal through the I / O device and outputting a timing start electrical signal to the timer 130 after receiving the valve closing signal. For example, the timing start electrical signal can be an electrical signal with a voltage of 5V. The timing end electrical signal can be an electrical signal different from the timing start electrical signal.
[0031] The timer 130 is configured to start timing upon receiving a timing start electrical signal, end timing upon receiving a timing end electrical signal, and output a timing signal indicating the timing duration to the controller 210. After the timer 130 ends timing, the duration from the start to the end of the timing is obtained. This duration is the duration the timer has been timing while the steam control valve is performing the closing action. By transmitting a timing signal indicating this duration to the controller 210, the controller 210 can record the closing time of the steam control valve as the duration of the timing.
[0032] As a feasible implementation, the controller 210 can store the closing time in a memory connected to the controller 210, and can display the closing time on a display device connected to the controller 210, such as a screen, for easy viewing by the user. By transmitting the timed duration to the controller 210, the controller 210 and electronic components connected to the controller 210 can be used to perform other processing on the timed duration, allowing the timing device 100 to work in conjunction with the controller 210 and other components, thereby improving the practicality of the timing device 100.
[0033] In the embodiment of the present application, the timing device 100 includes a first signal receiving circuit 110, a second signal receiving circuit 120, and a timer 130. The first signal receiving circuit 110 is connected to the timer 130 and the output terminal 211 of the controller 210, respectively. The timer 130 is connected to the second signal receiving circuit 120 and the input terminal 212 of the controller 210, respectively. The second signal receiving circuit 120 is connected to the valve opening feedback module 220. Upon receiving a valve closing signal output by the controller 210, the first signal receiving circuit 110 can send a timing start signal to the timer 130. Upon receiving a feedback signal output by the valve opening feedback module 220, the second signal receiving circuit 120 can determine whether the steam control valve is closed based on the feedback signal. If the result of the determination is that the steam control valve is closed, the second signal receiving circuit 120 can send a timing end signal to the timer 130. The timer 130 can start timing upon receiving a timing start electrical signal and end timing upon receiving a timing end electrical signal, and output a timing signal indicating the timing duration to the controller 210. The timing duration can be used to indicate the closing time of the steam control valve, causing the controller 210 to record the closing time of the steam control valve as the timing duration. The timing device 100 can timely receive valve closing signals and feedback signals through hardware such as the first signal receiving circuit 110 and the second signal receiving circuit 120, and generate timing start and timing end electrical signals for controlling the timing of the timer 130 without executing software programs. This can avoid the impact of the calculation cycle during software processing, thereby improving the accuracy of the timing start and timing end of the timer 130, and can more accurately time the closing time of the steam control valve.
[0034] In some optional embodiments, the valve closing signal includes a first valve closing signal and a second valve closing signal. Figure 2 or Figure 3 As shown, the output end 211 of the controller 210 includes a first port and a second port, and the timing device 100 further includes: a signal receiving circuit 140 connected to the first signal receiving circuit 110 .
[0035] The signal receiving circuit 140 is connected to the first port 2111 and the second port 2112 , respectively.
[0036] The signal receiving circuit 140 is configured to transmit the first valve closing signal to the first signal receiving circuit 110 when receiving the first valve closing signal output by the controller 210 through the first port 2111; and to transmit the second valve closing signal to the first signal receiving circuit 110 when receiving the second valve closing signal output by the controller 210 through the second port 2112.
[0037] Among them, the first valve closing signal is the signal output by the controller 210 to instruct the steam regulating valve to perform the closing action when the turbine is operating normally, and the second valve closing signal is the signal output by the controller 210 to instruct the steam regulating valve to perform the closing action when the turbine trips. The timing device 100 can receive these two signals through the signal receiving circuit 140.
[0038] In the embodiment of the present application, the timing device 100 further includes a signal receiving circuit 140, and the signal receiving circuit 140 is respectively connected to the first port 2111 and the second port 2112 of the output terminal 211 of the controller 210. The signal receiving circuit 140 can receive a first valve closing signal from the controller 210 from the first port 2111 and transmit the first valve closing signal to the first signal receiving circuit 110; the signal receiving circuit 140 can receive a second valve closing signal from the controller 210 from the second port 2112 and transmit the second valve closing signal to the first signal receiving circuit 110, so that the first signal receiving circuit 110 sends a timing start electrical signal to the timer 130 upon receiving the first valve closing signal and the second valve closing signal. This allows the closing time of the steam control valve to be measured both when the steam turbine is operating normally and when the steam turbine trips, making the timing device 100 applicable to a wider range of scenarios.
[0039] like Figure 3 As shown, in some optional embodiments, the timing device 100 further includes a test switch 150. One end of the test switch 150 is connected to the signal receiving circuit 140, and the other end of the test switch 150 is connected to the first signal receiving circuit 110. The signal receiving circuit 140 is configured to transmit the first valve closing signal as the valve closing signal to the first signal receiving circuit 110 via the test switch 150 when the test switch 150 is closed, or to transmit the second valve closing signal to the first signal receiving circuit 110 via the test switch 150.
[0040] In an embodiment of the present application, a test switch 150 can be set between the signal receiving circuit 140 and the first signal receiving circuit 110. The test switch 150 can control the on and off of the signal transmission between the signal receiving circuit 140 and the first signal receiving circuit 110, thereby flexibly controlling whether to enable the timing device 100 to time the closing time of the steam regulating valve, making the use of the timing device 100 more flexible.
[0041] In some optional embodiments, the feedback signal may be a current signal, and feedback signals with different current values indicate different opening degrees of the steam regulating valve.
[0042] The second signal receiving circuit 120 is configured to compare the feedback signal with the closing current. If the current value of the feedback signal is less than or equal to the closing current value, the steam control valve is determined to be closed. If the current value of the feedback signal is greater than the closing current value, the steam control valve is determined to be open. In other words, if the current value of the feedback signal is less than or equal to the closing current value, the steam control valve is considered closed, and the second signal receiving circuit 120 sends a timeout electrical signal to the timer 130.
[0043] For example, the current value of the feedback signal can be 4-20 mA. When the current value of the feedback signal is 20 mA, it can indicate that the opening of the steam control valve is 100%. When the current value of the feedback signal is 4 mA, it can indicate that the opening of the steam control valve is 0. When the current value of the feedback signal is equal to 4.08 mA, it can indicate that the opening of the steam control valve is 0.5%. The closing current can be a current of 4.08 mA. When the current value of the feedback signal is less than or equal to 4.08 mA, it can be considered that the steam control valve is closed.
[0044] As a feasible implementation, the second signal receiving circuit 120 may include a current comparator, so that the current value of the feedback signal and the current value of the closing current may be compared by the current comparator to determine whether the steam regulating valve is closed.
[0045] In the existing related technologies, the controller 210 of the steam turbine control system collects feedback signals according to a certain collection cycle, such as 10ms, 20ms and 50ms, and needs to execute a corresponding software program to process the feedback signals collected each time. The operation cycle of each time is about 50ms. The collection cycle of the feedback signal and the operation cycle of the feedback signal processing seriously affect the process of the controller 210 timing the closing time of the steam control valve, making it easy for the closing time of the steam control valve obtained by the timing to have a large error. In the embodiment of the present application, the second signal receiving circuit 120 can continuously receive the current signal as the feedback signal, and there is no need to collect the feedback signal according to a certain collection period. It only needs to use a current comparator to compare the feedback signal with the closing current, that is, it can be determined whether the steam control valve is closed. Specifically, when the current value of the feedback signal is less than or equal to the current value of the closing current, it can be determined that the steam control valve is closed. That is, when the current value of the feedback signal is less than or equal to the current value of the closing current, a timing end electrical signal can be sent to the timer 130. There is no need to execute the software program to process the feedback signal, and there is no operation cycle for the controller 210 to execute the software program. The whole process only takes 1~2ms, which can significantly save the time for collecting and processing the feedback signal, so that the timer 130 connected to the second signal receiving circuit 120 can timely time the closing time of the steam control valve, thereby reducing the error in timing the closing time of the steam control valve.
[0046] In the embodiment of the present application, the feedback signal is a current signal, and feedback signals with different current values indicate different openings of the steam control valve. The second signal receiving circuit 120 can compare the feedback signal with the closing current and determine that the steam control valve is closed when the current value of the feedback signal is less than or equal to the current value of the closing current; and determine that the steam control valve is not closed when the current value of the feedback signal is greater than the current value of the closing current. This allows the second signal receiving circuit 120 to determine whether the steam control valve is closed based solely on the current value of the feedback signal without having to execute complex judgment logic. This helps simplify the processing of the feedback signal by the second signal receiving circuit 120 and improves the speed at which the second signal receiving circuit 120 responds to the feedback signal.
[0047] In some optional embodiments, when the current value of the feedback signal is equal to the current value of the closing current, the opening of the steam regulating valve indicated by the feedback signal is N, and 0.3%≤N≤0.7%. For example, N can be 0.3%, 0.5%, or 0.7%.
[0048] The applicant has found through testing that when the opening of the steam control valve is reduced to 0.7%, the steam control valve essentially stops venting. In the embodiments of the present application, when setting the shut-off current, the shut-off current value can be set based on the current value of the feedback signal when the opening of the steam control valve is between 0.3% and 0.7%.
[0049] In the embodiment of the present application, when the current value of the feedback signal is equal to the current value of the closing current, the opening of the steam control valve indicated by the feedback signal is N. The closing current can be set according to the current value of the feedback signal when 0.3%≤N≤0.7%. When the opening of the steam control valve is between 0.3% and 0.7%, it can be determined that the steam control valve is closed, thereby more closely resembling the actual closing condition of the steam control valve. This allows the timing device 100 to more accurately time the closing time of the steam control valve based on the current value of the closing current.
[0050] like Figure 4 As shown, the present application also provides a steam turbine testing system 300 , comprising: a controller 210 , an opening feedback module 220 and a timing device 100 according to any of the above embodiments, wherein the controller 210 is connected to the timing device 100 , and the timing device 100 is connected to the opening feedback module 220 .
[0051] The steam turbine test system 300 provided in the embodiment of the present application is based on the same inventive concept as the embodiment of the aforementioned timing device 100 and can achieve the same effect. The specific implementation process can be found in the description in the embodiment of the aforementioned timing device 100 and will not be repeated here.
[0052] It should be noted that, in this article, the nouns and pronouns related to people in this patent application are not limited to specific genders, and relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including a..." do not exclude the presence of other identical factors in the process, method, article or device that includes the elements.
[0053] Finally, it should be noted that the above are only preferred embodiments of the present application and are only used to illustrate the technical solutions of the present application and are not intended to limit the scope of protection of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application are included in the scope of protection of the present application.
Claims
1. A timing device (100) for timing the closing time of a steam control valve of a steam turbine; the steam control valve is connected to a controller (210) of the steam turbine, and an opening feedback module (220) is provided in the steam control valve; the controller (210) is configured to output a valve closing signal to the controller (210), so as to trigger the steam control valve to perform a closing action through the valve closing signal; the opening feedback module (220) is configured to detect the opening of the steam control valve and output a feedback signal indicating the opening of the steam control valve, characterized in that: The timing device (100) comprises: a first signal receiving circuit (110), a second signal receiving circuit (120) and a timer (130); The first signal receiving circuit (110) is connected to the timer (130) and the output end (211) of the controller (210) respectively, the timer (130) is connected to the second signal receiving circuit (120) and the input end (212) of the controller (210) respectively, and the second signal receiving circuit (120) is connected to the opening feedback module (220); The first signal receiving circuit (110) is configured to send a timing start electrical signal to the timer (130) upon receiving the valve closing signal output by the controller (210); The second signal receiving circuit (120) is configured to, upon receiving the feedback signal output by the opening feedback module (220), determine whether the steam regulating valve is closed based on the feedback signal; if it is determined that the steam regulating valve is closed, send a timing end electrical signal to the timer (130); The timer (130) is configured to start timing when receiving the timing start electrical signal; end timing when receiving the timing end electrical signal, and output a timing signal indicating the timing duration to the controller (210). The feedback signal is a current signal, and the current value of the feedback signal is 4-20 mA. When the current value of the feedback signal is 20 mA, it indicates that the opening of the steam control valve is 100%; when the current value of the feedback signal is 4 mA, it indicates that the opening of the steam control valve is 0; when the current value of the feedback signal is equal to 4.08 mA, it indicates that the opening of the steam control valve is 0.5%; The second signal receiving circuit (120) is configured to compare the feedback signal with the closing current; and when the current value of the feedback signal is less than or equal to the current value of the closing current, it is judged that the steam regulating valve is closed; when the current value of the feedback signal is greater than the current value of the closing current, it is judged that the steam regulating valve is not closed.
2. The timing device (100) according to claim 1, characterized in that The valve closing signal includes a first valve closing signal and a second valve closing signal, the output end (211) of the controller (210) includes a first port (2111) and a second port (2112), and the timing device (100) further includes: a signal receiving circuit (140) connected to the first signal receiving circuit (110); The signal receiving circuit (140) is connected to the first port (2111) and the second port (2112) respectively; The signal receiving circuit (140) is configured to, upon receiving a first valve closing signal outputted by the controller (210) through the first port (2111), transmit the first valve closing signal to the first signal receiving circuit (110); and upon receiving a second valve closing signal outputted by the controller (210) through the second port (2112), transmit the second valve closing signal to the first signal receiving circuit (110); The first valve closing signal is a signal output by the controller (210) to instruct the steam control valve to perform a closing action when the steam turbine is operating normally, and the second valve closing signal is a signal output by the controller (210) to instruct the steam control valve to perform a closing action when the steam turbine trips.
3. The timing device (100) according to claim 2, characterized in that Also includes: testSwitch(150); One end of the test switch (150) is connected to the signal receiving circuit (140), and the other end of the test switch (150) is connected to the first signal receiving circuit (110); The signal receiving circuit (140) is configured to transmit the first valve closing signal to the first signal receiving circuit (110) through the test switch (150) when the test switch (150) is closed, or to transmit the second valve closing signal to the first signal receiving circuit (110) through the test switch (150).
4. The timing device (100) according to claim 1, characterized in that When the opening degree of the steam regulating valve is a value between 0.3% and 0.7%, it is determined that the steam regulating valve has been closed.
5. A steam turbine testing system (300), characterized in that: include: A controller (210), an opening feedback module (220), and a timing device (100) according to any one of claims 1 to 4; the controller (210) is connected to the timing device (100), and the timing device (100) is connected to the opening feedback module (220).