Monitoring method and system for low oil pressure in speed regulator accident

Abstract

The invention provides a speed regulator accident low oil pressure monitoring method and system. The method comprises the steps that a first action signal output by a first pressure switch and a second action signal output by a second pressure switch are collected, and the first pressure switch and the second pressure switch are both arranged on a pressure oil tank of the speed regulator; oil pressure signals output by a pressure sensor are collected, and the pressure sensor is arranged on a speed regulator oil pressure device; the first action signal, the second action signal and the oil pressure signal are input into a first monitoring unit and a second monitoring unit; the first monitoring unit and the second monitoring unit independently execute the step of performing speed regulator accident low-oil-pressure logic judgment based on the first action signal, the second action signal and the oil pressure signal; and when the two monitoring units judge that the speed regulator accident low oil pressure occurs, the first monitoring unit and the second monitoring unit independently execute a delayed accident shutdown process. According to the invention, the frequency of false shutdown can be reduced, and the reliability and safety of accident signal judgment are improved.

Description

Technical Field

[0001] The present application relates to the technical field of hydropower stations, and in particular to a method and system for monitoring low oil pressure in a governor accident. Background Art

[0002] In the prior art, the governor's oil pressure system typically relies on a single pressure switch to detect low oil pressure signals. However, this approach often carries the following risks: 1) misjudgment, such as contact sticking and false triggering of the pressure switch, leading to unnecessary downtime; and 2) missed detection, such as component failure, which can disable critical protection, causing equipment damage or safety incidents.

[0003] Therefore, there is currently a lack of effective means for monitoring the governor's accidental low oil pressure. Summary of the Invention

[0004] The embodiments of the present application provide a method and system for monitoring low oil pressure in a speed regulator accident.

[0005] According to a first aspect of an embodiment of the present application, a method for monitoring a low oil pressure in a speed governor accident is provided, comprising:

[0006] collecting a first action signal output by a first pressure switch and a second action signal output by a second pressure switch, wherein the first pressure switch and the second pressure switch are both provided on a pressure oil tank of the speed regulator;

[0007] Collecting the oil pressure signal output by the pressure sensor, wherein the pressure sensor is provided on the oil pressure device of the speed regulator;

[0008] inputting the first action signal, the second action signal and the oil pressure signal into a first monitoring unit and a second monitoring unit;

[0009] The first monitoring unit and the second monitoring unit each independently perform a step of performing a logic judgment of a governor accident low oil pressure based on the first action signal, the second action signal and the oil pressure signal;

[0010] When both the first monitoring unit and the second monitoring unit determine that a governor accident low oil pressure occurs, the first monitoring unit outputs a first accident shutdown signal after a delay of a first time period, and the second monitoring unit outputs a second accident shutdown signal after a delay of the first time period, and the accident shutdown process is started based on the first accident shutdown signal or the second accident shutdown signal.

[0011] According to a second aspect of an embodiment of the present application, a monitoring system for a low oil pressure in a speed governor accident is provided, comprising:

[0012] a first acquisition unit, configured to acquire a first action signal output by a first pressure switch and a second action signal output by a second pressure switch, and input the first action signal and the second action signal to a first monitoring unit and a second monitoring unit, wherein the first pressure switch and the second pressure switch are both provided on the pressure oil tank of the speed regulator;

[0013] a second acquisition unit, configured to acquire an oil pressure signal output by a pressure sensor and input the oil pressure signal to the first monitoring unit and the second monitoring unit, wherein the pressure sensor is provided on the oil pressure device of the speed regulator;

[0014] The first monitoring unit is configured to perform a logic judgment of a governor accident low oil pressure based on the first action signal, the second action signal, and the oil pressure signal, and when both the first monitoring unit and the second monitoring unit judge that a governor accident low oil pressure occurs, the first monitoring unit outputs a first emergency shutdown signal after a delay of a first time length;

[0015] the second monitoring unit is configured to perform a logic judgment of a governor accident low oil pressure based on the first action signal, the second action signal, and the oil pressure signal, and when both the first monitoring unit and the second monitoring unit judge that a governor accident low oil pressure occurs, the second monitoring unit outputs a second emergency shutdown signal after a delay of the first time length;

[0016] A shutdown process starting unit is used to start the emergency shutdown process based on the first emergency shutdown signal or the second emergency shutdown signal.

[0017] According to the technical solution of this application, through multiple signal verification and redundant design, the number of false shutdowns can be reduced, the continuity of equipment operation can be improved, protection refusal to operate can be avoided, the probability of safety accidents can be reduced, and the reliability and safety of accident signal judgment can be effectively improved while maintaining the timeliness of system response.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1 A flow chart of a method for monitoring low oil pressure in a speed regulator accident provided by an embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of the first monitoring unit performing logic judgment of accidental low oil pressure according to an embodiment of the present application;

[0022] Figure 3 This is a block diagram of a monitoring system for a low oil pressure accident in a speed regulator according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0024] The embodiments of the present application are not exhaustive, but are merely illustrative of some embodiments and are not intended to be a specific limitation on the scope of protection of the present application. In the absence of contradiction, each step in a certain embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a certain embodiment can also be implemented as an independent embodiment, and the order of the steps in a certain embodiment can be arbitrarily exchanged. In addition, the optional implementations in a certain embodiment can be arbitrarily combined; in addition, the embodiments can be arbitrarily combined. For example, some or all of the steps in different embodiments can be arbitrarily combined, and a certain embodiment can be arbitrarily combined with the optional implementations of other embodiments.

[0025] In each embodiment of the present application, unless otherwise specified or there is any logical conflict, the terms and / or descriptions between the embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form a new embodiment based on their inherent logical relationships.

[0026] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0027] In the embodiments of the present application, "at least one" refers to one or more than two.

[0028] The following describes a method and system for monitoring low oil pressure in a speed governor accident according to an embodiment of the present application with reference to the accompanying drawings.

[0029] Figure 1 This is a flow chart of a method for monitoring low oil pressure in a speed regulator accident provided by an embodiment of the present application. Figure 1 As shown, the method for monitoring the governor accident low oil pressure may include but is not limited to the following steps.

[0030] In step 101, a first action signal output by a first pressure switch and a second action signal output by a second pressure switch are collected.

[0031] In some embodiments, the first pressure switch and the second pressure switch are both provided on the speed regulator pressure oil tank. For example, the pressure of the speed regulator pressure oil tank can be detected. When the pressure of the speed regulator pressure oil tank reaches a first pressure value (e.g., 4.84 MPa), the first pressure switch is actuated, changing from a normally open contact to a normally closed contact, and the second pressure switch is actuated, changing from a normally open contact to a normally closed contact.

[0032] In step 102, the oil pressure signal output by the pressure sensor is collected.

[0033] In some embodiments, the pressure sensor is provided on the speed regulator oil pressure device. Exemplarily, the pressure sensor provided on the speed regulator oil pressure device can detect the oil pressure of the speed regulator oil pressure device.

[0034] For example, the oil pressure signal output by the pressure sensor can be collected in real time. Alternatively, when the pressure sensor detects that the oil pressure of the governor oil pressure device drops to a second pressure value (such as 5.2 MPa), the oil pressure signal is output, which is an emergency low oil pressure signal.

[0035] In step 103 , the first motion signal, the second motion signal, and the oil pressure signal are input to the first monitoring unit and the second monitoring unit.

[0036] For example, when the first pressure switch is actuated, the actuation signal of the first pressure switch can be sent to the first monitoring unit and the second monitoring unit via a hardwired circuit. When the second pressure switch is actuated, the actuation signal of the second pressure switch can be sent to the first monitoring unit and the second monitoring unit via a hardwired circuit. When the pressure sensor outputs an oil pressure signal, the oil pressure signal can be sent to the first monitoring unit and the second monitoring unit via a hardwired circuit.

[0037] In some embodiments, the first monitoring unit and the second monitoring unit may both be programmable logic controllers (PLCs). Exemplarily, the first monitoring unit and the second monitoring unit have PLC control programs to support logic operations and signal locking functions.

[0038] In step 104 , the first monitoring unit and the second monitoring unit independently perform a step of performing a logic judgment of a governor accident low oil pressure based on the first action signal, the second action signal and the oil pressure signal.

[0039] In an embodiment of the present application, the first monitoring unit and the second monitoring unit may determine whether to delay the emergency shutdown process based on the first action signal, the second action signal and the oil pressure signal, respectively.

[0040] In some embodiments, the first monitoring unit can perform an AND logic judgment based on the first action signal, the second action signal, and the oil pressure signal to determine a governor accident low oil pressure logic judgment. In one possible implementation, when the first action signal and the second action signal are both signals of a normally open node changing to a normally closed node, and the oil pressure signal is an accident low oil pressure signal, the first monitoring unit can determine that a governor accident low oil pressure has occurred.

[0041] In some embodiments, the second monitoring unit can perform an AND logic judgment based on the first action signal, the second action signal, and the oil pressure signal to determine if a governor accident low oil pressure logic judgment has occurred. In one possible implementation, if both the first action signal and the second action signal are signals of normally open nodes being changed to normally closed nodes, and the oil pressure signal is an accident low oil pressure signal, the second monitoring unit can determine that a governor accident low oil pressure has occurred.

[0042] In step 105, if both the first monitoring unit and the second monitoring unit determine that a governor accident low oil pressure has occurred, the first monitoring unit outputs a first emergency shutdown signal after a first delay, and the second monitoring unit outputs a second emergency shutdown signal after a first delay. The emergency shutdown process is initiated based on the first or second emergency shutdown signal. For example, the first delay may be 30 seconds, but is not limited thereto.

[0043] In some embodiments, the first monitoring unit and the second monitoring unit can communicate with each other. When the first monitoring unit determines that a governor accident low oil pressure has occurred based on the first action signal, the second action signal, and the oil pressure signal, the first monitoring unit can notify the second monitoring unit so that the first monitoring unit knows that the governor accident low oil pressure has occurred. When the second monitoring unit determines that a governor accident low oil pressure has occurred based on the first action signal, the second action signal, and the oil pressure signal, the second monitoring unit can notify the first monitoring unit so that the second monitoring unit knows that the governor accident low oil pressure has occurred.

[0044] In some embodiments, when the first monitoring unit and the second monitoring unit both determine that a governor accident low oil pressure occurs, the first monitoring unit and the second monitoring unit can both output an accident shutdown signal after a first delay (i.e., the first monitoring unit outputs a first accident shutdown signal, and the second monitoring unit outputs a second accident shutdown signal), and can directly use the first accident shutdown signal output by the first monitoring unit to start the accident shutdown process.

[0045] In some embodiments, when the first monitoring unit and the second monitoring unit both determine that a governor accident low oil pressure occurs, the first monitoring unit and the second monitoring unit both output an accident shutdown signal after a first delay (i.e., the first monitoring unit outputs a first accident shutdown signal, and the second monitoring unit outputs a second accident shutdown signal), and the second accident shutdown signal output by the second monitoring unit can be directly used to start the accident shutdown process.

[0046] That is to say, the first accident shutdown signal output by the first monitoring unit and the second accident shutdown signal output by the second monitoring unit can be executed using "OR" logic, that is, the first accident shutdown signal output by the first monitoring unit can be directly and fixedly used to start the accident shutdown process according to actual conditions, or the second accident shutdown signal output by the second monitoring unit can be directly and fixedly used to start the accident shutdown process.

[0047] In some embodiments, when the first monitoring unit and the second monitoring unit both determine that a governor accident low oil pressure occurs, the first monitoring unit and the second monitoring unit both output an accident stop signal after a first delay (i.e., the first monitoring unit outputs a first accident stop signal, and the second monitoring unit outputs a second accident stop signal). Based on the accident stop signal output time and redundancy rules, the first accident stop signal or the second accident stop signal can be used to start the accident stop process; wherein, the redundancy rules include using the accident stop signal output first and ignoring the accident stop signal output later.

[0048] That is, for the first emergency shutdown signal output by the first monitoring unit and the second emergency shutdown signal output by the second monitoring unit, the output time of the emergency shutdown signal can be determined, and the emergency shutdown process can be initiated based on the strategy of adopting the emergency shutdown signal output first and ignoring the emergency shutdown signal output later. For example, taking the example of the first emergency shutdown signal output by the first monitoring unit first and the second emergency shutdown signal output by the second monitoring unit later, the first emergency shutdown signal can be used to initiate the emergency shutdown process, and the second emergency shutdown signal can be ignored. For another example, taking the example of the second emergency shutdown signal output by the second monitoring unit first and the first emergency shutdown signal output by the first monitoring unit later, the second emergency shutdown signal can be used to initiate the emergency shutdown process, and the first emergency shutdown signal can be ignored.

[0049] In the above embodiment, through multiple signal verification and redundant design, the number of false shutdowns can be reduced, the continuity of equipment operation can be improved, protection refusal to operate can be avoided, the probability of safety accidents can be reduced, and the reliability and safety of accident signal judgment can be effectively improved while maintaining the timeliness of system response.

[0050] In order to further enhance the reliability of the protection logic, optionally, in some embodiments, when both the first monitoring unit and the second monitoring unit determine that a low oil pressure due to a speed regulator accident occurs, the hard pressure plate and the soft pressure plate of the speed regulator accident low oil pressure can be locked separately based on a double locking mechanism. Exemplarily, a double locking mechanism can be set, namely: 1) hard pressure plate locking: mechanical interlocking protection; 2) soft pressure plate locking: software logic interlocking. That is, when both the first monitoring unit and the second monitoring unit determine that a low oil pressure due to a speed regulator accident occurs, the hard pressure plate is locked to achieve mechanical interlocking protection, and the soft pressure plate is locked to achieve software logic interlocking. Thus, the reliability of the protection logic can be further enhanced through the coordinated control of the hard pressure plate and the soft pressure plate.

[0051] In order to further ensure that the emergency shutdown signal can be accurately and effectively issued when an accident occurs, optionally, in some embodiments, when at least one of the first action signal, the second action signal, and the oil pressure signal is not collected, the hard pressure plate and the soft pressure plate can be locked separately based on the double locking mechanism, and an alarm signal can be output. In other words, the present application can use a dual pressure switch to send one signal to the monitoring unit for accident low oil pressure logic judgment, and perform an AND logic judgment with the oil pressure signal output by the pressure sensor (such as the accident low oil pressure signal). The three signals are simultaneously subjected to AND logic judgment. If any signal is missing, the hard pressure plate and the soft pressure plate are locked and an alarm signal is output. That is, if any signal is missing, the governor accident low oil pressure alarm signal cannot be output, and the monitoring unit cannot start the accident shutdown process, thereby further ensuring that the accident shutdown signal can be accurately and effectively issued when an accident occurs.

[0052] In order to further improve the reliability and safety of accident signal judgment, optionally, in some embodiments, the transmission channels of the first action signal, the second action signal, and the oil pressure signal can be self-checked, and when a fault is detected in at least one of the transmission channels of the first action signal, the second action signal, and the oil pressure signal, an alarm process is performed to promptly repair the faulty transmission channel. In other words, a fault self-diagnosis function can be set on the transmission channels of the first action signal, the second action signal, and the oil pressure signal, so that signal anomalies can be quickly located, which is convenient for maintenance and can ensure that the first action signal, the second action signal, and the oil pressure signal input to the monitoring unit are all valid signals, thereby further improving the reliability and safety of accident signal judgment.

[0053] Figure 2 This is a schematic diagram of the first monitoring unit of the embodiment of the present application performing the logic judgment of low oil pressure in an accident. It can be understood that the logic judgment of low oil pressure in an accident by the second monitoring unit is similar to that of the first monitoring unit. Here, the logic judgment of low oil pressure in an accident by the first monitoring unit is described as an example. Figure 2As shown, the first monitoring unit can collect the first action signal output by the first pressure switch and the second action signal output by the second pressure switch, and collect the oil pressure signal output by the pressure sensor, and perform a logical judgment on the first action signal, the second action signal and the oil pressure signal for logic judgment of the low oil pressure of the speed regulator accident. When the first action signal and the second action signal are both normally open nodes that change to normally closed node signals, and the oil pressure signal is an accident low oil pressure signal, the first monitoring unit can determine that a low oil pressure of the speed regulator accident occurs, that is, an accident low oil pressure mechanical accident shutdown alarm of the speed regulator oil pressure device, and lock the hard pressure plate and soft pressure plate of the speed regulator accident low oil pressure to achieve the purpose of protecting the pressure plate of the speed regulator accident low oil pressure. After delaying for a first time period and locking the hard pressure plate and soft pressure plate of the speed regulator accident low oil pressure, the first monitoring unit can output an accident shutdown signal to start the accident shutdown process.

[0054] Figure 3 This is a block diagram of a monitoring system for low oil pressure in a speed governor accident according to an embodiment of the present application. Figure 3 As shown, the monitoring system for the governor accident low oil pressure may include: a first acquisition unit 301 , a second acquisition unit 302 , a first monitoring unit 303 , a second monitoring unit 304 and a shutdown process starting unit 305 .

[0055] Among them, the first acquisition unit 301 is used to collect the first action signal output by the first pressure switch and the second action signal output by the second pressure switch, and input the first action signal and the second action signal into the first monitoring unit and the second monitoring unit. The first pressure switch and the second pressure switch are both arranged on the speed regulator pressure oil tank.

[0056] The second acquisition unit 302 is used to acquire the oil pressure signal output by the pressure sensor and input the oil pressure signal to the first monitoring unit and the second monitoring unit. The pressure sensor is set on the oil pressure device of the speed regulator.

[0057] The first monitoring unit 303 is used to perform logic judgment on the low oil pressure of the speed regulator accident based on the first action signal, the second action signal and the oil pressure signal, and when the first monitoring unit and the second monitoring unit both judge that the low oil pressure of the speed regulator accident occurs, the first monitoring unit outputs the first accident shutdown signal after a delay of the first time length.

[0058] The second monitoring unit 304 is used to perform logic judgment on the low oil pressure of the speed regulator accident based on the first action signal, the second action signal and the oil pressure signal, and when the first monitoring unit and the second monitoring unit both judge that the low oil pressure of the speed regulator accident occurs, the second monitoring unit outputs the second accident shutdown signal after a delay of the first time length.

[0059] The shutdown process starting unit 305 is configured to start the emergency shutdown process based on the first emergency shutdown signal or the second emergency shutdown signal.

[0060] In some embodiments, the shutdown process starting unit 305 is used to: directly adopt the first accident shutdown signal to start the accident shutdown process; or, directly adopt the second accident shutdown signal to start the accident shutdown process; or, based on the accident shutdown signal output time and redundancy rules, adopt the first accident shutdown signal or the second accident shutdown signal to start the accident shutdown process; wherein, the redundancy rules include adopting the accident shutdown signal output first and ignoring the accident shutdown signal output later.

[0061] In some embodiments, the first monitoring unit 303 is configured to perform an AND logic judgment based on the first action signal, the second action signal, and the oil pressure signal to determine a governor accident low oil pressure logic judgment. In one possible implementation, if the first action signal and the second action signal are both signals of a normally open node being changed to a normally closed node, and the oil pressure signal is an accident low oil pressure signal, the first monitoring unit 303 determines that a governor accident low oil pressure has occurred.

[0062] In some embodiments, the second monitoring unit 304 is configured to perform an AND logic judgment based on the first action signal, the second action signal, and the oil pressure signal to determine if a governor accident low oil pressure has occurred. In one possible implementation, if the first action signal and the second action signal are both signals of a normally open node being changed to a normally closed node, and the oil pressure signal is an accident low oil pressure signal, the second monitoring unit 304 determines that a governor accident low oil pressure has occurred.

[0063] In order to further enhance the reliability of the protection logic, optionally, in some embodiments, the first monitoring unit and the second monitoring unit are also used to: when the first monitoring unit and the second monitoring unit both determine that a speed regulator accident low oil pressure occurs, respectively lock the speed regulator accident low oil pressure hard pressure plate and soft pressure plate based on the double locking mechanism.

[0064] To further ensure accurate and effective issuance of an emergency shutdown signal in the event of an accident, the governor emergency low oil pressure monitoring system may optionally, in some embodiments, further include an alarm module. The alarm module is configured to, upon failure to acquire at least one of the first action signal, the second action signal, or the oil pressure signal, lock the hard and soft pressure plates using a dual locking mechanism and output an alarm signal.

[0065] To further improve the reliability and safety of accident signal determination, the governor accident low oil pressure monitoring system may optionally, in some embodiments, further include a self-test module. The self-test module is configured to perform a self-test on the transmission channels of the first action signal, the second action signal, and the oil pressure signal, and, upon detecting a failure in at least one of the transmission channels of the first action signal, the second action signal, and the oil pressure signal, initiate an alarm process to promptly repair the failed transmission channel.

[0066] In some embodiments, the first monitoring unit and the second monitoring unit are both programmable logic controllers.

[0067] It should be noted that the above explanation of the embodiment of the method for monitoring low oil pressure in a speed governor accident is also applicable to the monitoring system for low oil pressure in a speed governor accident of this embodiment, and will not be repeated here.

[0068] In the above embodiment, through multiple signal verification and redundant design, the number of false shutdowns can be reduced, the continuity of equipment operation can be improved, protection refusal to operate can be avoided, the probability of safety accidents can be reduced, and the reliability and safety of accident signal judgment can be effectively improved while maintaining the timeliness of system response.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0071] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0072] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and a portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0073] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0074] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0075] In addition, the functional units in the various embodiments of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into a module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0076] The storage medium mentioned above may be a read-only memory, a magnetic disk, or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application. Persons skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A method for monitoring low oil pressure in a speed governor accident, characterized in that: include: collecting a first action signal output by a first pressure switch and a second action signal output by a second pressure switch, wherein the first pressure switch and the second pressure switch are both provided on a pressure oil tank of the speed regulator; Collecting the oil pressure signal output by the pressure sensor, wherein the pressure sensor is provided on the oil pressure device of the speed regulator; inputting the first action signal, the second action signal and the oil pressure signal into a first monitoring unit and a second monitoring unit; The first monitoring unit and the second monitoring unit each independently perform a step of performing a logic judgment of a governor accident low oil pressure based on the first action signal, the second action signal and the oil pressure signal; When both the first monitoring unit and the second monitoring unit determine that a governor accident low oil pressure occurs, the first monitoring unit outputs a first accident shutdown signal after a delay of a first time period, and the second monitoring unit outputs a second accident shutdown signal after a delay of the first time period, and the accident shutdown process is started based on the first accident shutdown signal or the second accident shutdown signal.

2. The method according to claim 1, characterized in that The initiating the emergency shutdown process based on the first emergency shutdown signal or the second emergency shutdown signal includes: directly using the first emergency shutdown signal to start the emergency shutdown process; or, directly using the second emergency shutdown signal to start the emergency shutdown process; or, Based on the emergency shutdown signal output time and redundancy rules, the first emergency shutdown signal or the second emergency shutdown signal is used to start the emergency shutdown process; wherein, the redundancy rules include using the emergency shutdown signal output first and ignoring the emergency shutdown signal output later.

3. The method according to claim 1, characterized in that The performing of logic judgment of low oil pressure in a speed regulator accident based on the first action signal, the second action signal, and the oil pressure signal includes: An AND logic judgment is performed based on the first action signal, the second action signal and the oil pressure signal for logic judgment of low oil pressure in a speed regulator accident.

4. The method according to claim 3, characterized in that The performing logical judgment based on the first action signal, the second action signal, and the oil pressure signal includes: The first action signal and the second action signal are both signals of a normally open node changing to a normally closed node, and the oil pressure signal is an accident low oil pressure signal, and it is determined that an accident low oil pressure of the speed regulator occurs.

5. The method according to claim 1, characterized in that When both the first monitoring unit and the second monitoring unit determine that a governor accident low oil pressure occurs, the method further includes: Based on the double locking mechanism, the hard pressure plate and soft pressure plate of the speed governor with low oil pressure in an accident are locked respectively.

6. The method according to claim 1, characterized in that The method further comprises: If at least one of the first action signal, the second action signal, and the oil pressure signal is not collected, the hard pressure plate and the soft pressure plate are locked respectively based on the double locking mechanism, and an alarm signal is output.

7. The method according to any one of claims 1 to 6, characterized in that The method further comprises: The transmission channels of the first action signal, the second action signal, and the oil pressure signal are self-checked, and when a fault is detected in the transmission channel of at least one of the first action signal, the second action signal, and the oil pressure signal, an alarm is processed to promptly repair the faulty transmission channel.

8. The method according to claim 1, characterized in that The first monitoring unit and the second monitoring unit are both programmable logic controllers.

9. A monitoring system for low oil pressure in a speed governor accident, characterized in that: include: a first acquisition unit, configured to acquire a first action signal output by a first pressure switch and a second action signal output by a second pressure switch, and input the first action signal and the second action signal to a first monitoring unit and a second monitoring unit, wherein the first pressure switch and the second pressure switch are both provided on the pressure oil tank of the speed regulator; a second acquisition unit, configured to acquire an oil pressure signal output by a pressure sensor and input the oil pressure signal to the first monitoring unit and the second monitoring unit, wherein the pressure sensor is provided on the oil pressure device of the speed regulator; The first monitoring unit is configured to perform a logic judgment of a governor accident low oil pressure based on the first action signal, the second action signal, and the oil pressure signal, and when both the first monitoring unit and the second monitoring unit judge that a governor accident low oil pressure occurs, the first monitoring unit outputs a first emergency shutdown signal after a delay of a first time length; the second monitoring unit is configured to perform a logic judgment of a governor accident low oil pressure based on the first action signal, the second action signal, and the oil pressure signal, and when both the first monitoring unit and the second monitoring unit judge that a governor accident low oil pressure occurs, the second monitoring unit outputs a second emergency shutdown signal after a delay of the first time length; A shutdown process starting unit is used to start the emergency shutdown process based on the first emergency shutdown signal or the second emergency shutdown signal.

10. The system according to claim 9, characterized in that The first monitoring unit and the second monitoring unit are further configured to: When both the first monitoring unit and the second monitoring unit determine that a low oil pressure due to a speed governor accident occurs, the hard pressure plate and the soft pressure plate of the low oil pressure due to a speed governor accident are locked respectively based on a double locking mechanism.

Images