Monitoring system of power plant clock time service equipment

Abstract

The invention relates to a monitoring system of power plant clock time service equipment applied to the related technical field of power industrial equipment time service, through the arrangement of a time difference monitoring module, on one hand, the time difference between a slave clock and a master clock and the time difference between two master clocks can be monitored in real time, and on the other hand, the time difference between the slave clock and the master clock can be monitored in real time. According to the method, the performance of the slave clock can be evaluated and predicted, and then the standard threshold value between the slave clock with poor performance and the master clock can be lowered, so that the slave clock with poor performance can trigger an alarm when small time fluctuation occurs, and therefore, a normal slave clock can be switched; compared with the setting of the time difference threshold value with uniform performance in the prior art, the time consistency of the power plant is effectively ensured, in addition, the two main clocks with inconsistent time can be distinguished through reverse selection, the abnormity of the main clocks can be found in time, and the maintenance of the time consistency of the power plant is further improved.

Description

Technical Field

[0001] The present invention relates to a power plant monitoring system, in particular to a monitoring system for power plant clock timing equipment applied in the technical field related to time timing of power industry equipment. Background Art

[0002] With the rapid development of high technology, power plant automation systems are increasingly demanding a unified clock. In accordance with various technical specifications, a timing system based on Beidou satellite signals, supplemented by Global Positioning System (GPS), combined with network and information technology, can fully meet the precise timing requirements of power plant automation systems.

[0003] In today's power plant production environment, an increasing number of devices and equipment utilize network protocols and standard network protocol message interfaces for data transmission and monitoring. Power plants operate a large number of configured devices. Because these devices operate at high temperatures and high heat levels, there is a strong temporal correlation between their operation and their protection devices. Therefore, the time synchronization system for these numerous devices and protection devices requires high precision and real-time timing. However, existing power plant time synchronization systems typically utilize a satellite clock that transmits directly to the equipment's timing port. Daily on-site inspections of equipment status at the clock's location are required. This makes it difficult to verify the clock's operation and timing, making it difficult to verify whether the equipment is properly timed. This can lead to operational delays and other issues during the sequential operation of power plant protection systems, posing a significant safety hazard. Consequently, existing technologies lack effective information-based monitoring and management of clock sources and timing, yet time monitoring and management are crucial for power plant operations.

[0004] To address the above-mentioned issues, Chinese patent CN116886554A discloses a monitoring system for power plant clock and timing equipment, which enables effective information-based monitoring, management, and visual display of clock and timing equipment in power plants. This solves the problem of the lack of effective information-based monitoring and management of clock sources and timing in existing power plant environments, and improves the time synchronization, security, and business execution capabilities of power plants.

[0005] The specification of Chinese patent CN114006673A discloses a timing server, timing method, and device. The SNTP timing hardware module, connected to a real-time clock module, is used to send time data to a client in the network that is waiting for timing according to the SNTP protocol based on a time reference. A main control module, connected to the real-time clock module and the SNTP timing hardware module, is used to obtain the current time of the real-time clock module upon receiving a time calibration command from a main monitoring device, and to determine whether the calibration time in the calibration command is consistent with the current time. If not, the time of the real-time clock module and the SNTP timing hardware module are calibrated based on the calibration time. This can improve timing accuracy and is not limited by usage scenarios.

[0006] Since network signals, clock operation stability, power supply and other issues affect clock performance, the display of clock time will be affected, which can easily cause a time difference between the slave clock installed on the electrical equipment and the master clock used as a benchmark, resulting in poor time synchronization in the power plant. There is a lag, advance, or even missing operation between the execution of some operations and the target time. When acquiring some fault data, it is easy to obtain data at the wrong time node, affecting the stable and safe operation of the power plant equipment. However, the monitoring of time consistency between various power plant equipment in the above-mentioned patent only stays at the time level, and ignores the impact of clock performance, resulting in poor improvement of power plant time data consistency. There are still certain differences between the times of various power plant equipment, especially the master clock used as a benchmark. When the time accuracy of the master clock is abnormal, it will cause the time of the slave clocks on all power plant equipment based on it to have passive abnormalities, which has a greater impact on the stable and safe operation of the power plant. Summary of the Invention

[0007] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that due to the neglect of clock performance, there are still certain differences between the time of various power plant equipment.

[0008] To solve the above problems, the present invention provides a monitoring system for power plant clock timing equipment, comprising a monitoring center, a visual display module, a time difference monitoring module, an alarm module, a communication module, a plurality of slave clocks respectively installed on electrical equipment in the power plant, a master clock installed in the monitoring center, and a sensor group respectively installed on the master clock and the slave clocks. The communication module is used for time synchronization communication between the master clock and the slave clocks. The visual display module, the time difference monitoring module, the communication module, the alarm module, the sensor group, the master clock, and the slave clocks are all connected to the monitoring center by signal. The time difference monitoring module includes a calculation unit, a sub-alarm, a prediction unit, a statistical unit and a threshold adjustment unit. A standard threshold is set in the calculation unit. The standard threshold is represented by a. The standard threshold represents the time difference between two master clocks and between a slave clock in working state and the master clock.

[0009] In the monitoring system of the clock timing equipment of the above-mentioned power plant, for the slave clock, its performance can be evaluated and predicted, and the threshold of the slave clock with poor performance can be lowered, so that the slave clock with poor performance can trigger an alarm when a small time fluctuation occurs, thereby switching to a normal slave clock. For the master clock, the two master clocks with inconsistent time can be distinguished by reverse selection, so as to timely detect the abnormality of the master clock, further improve the maintenance of the time consistency of the power plant, and through the development of the time synchronization protocol to connect the satellite time protocol analysis and digitization, the master clock, slave clock time and satellite time are synchronized and corrected, and the correlation of many equipment in the power plant and the monitoring of whether the timing status is normal are realized, which plays a great significance and role in the production and safety protection of the power plant.

[0010] As a further improvement of the present application, the monitoring system also includes a scheduling switching module, two master clocks are set, and two slave clocks are also set on each electrical device, and the two slave clocks and the two master clocks do not work at the same time, and the non-working slave clocks and master clocks serve as backup clocks.

[0011] As a further improvement of the present application, the monitoring method of the time difference monitoring module for the slave clock includes the following steps: S1. First, the calculation unit calculates the time difference between the working slave clock and the working master clock in real time, and compares it with a standard threshold preset in the calculation unit. When the time difference is less than the standard threshold, it indicates that the slave clock is normal; S2. When the time difference is greater than the standard threshold, it indicates that there is an abnormality in the slave clock. At this time, the sub-alarm will sound an alarm. At the same time, the monitoring center switches the status of the two slave clocks through the scheduling switching module, so that the backup slave clock replaces the abnormal slave clock. At the same time, the monitoring center controls the working master clock to re-time the abnormal slave clock under the action of the time synchronization protocol, so that the slave clock time returns to normal; S3. The statistical unit collects statistics on the abnormal conditions of each slave clock, including the number of alarm triggering times and time intervals, and feeds the abnormal conditions back to the prediction unit. Each time the prediction unit receives an abnormality from a slave clock, it retrieves the data on the operating temperature, network signal strength, and battery power of the abnormal slave clock detected by the sensor group at the corresponding time point, and then evaluates and predicts the corresponding abnormal slave clock based on the above data. S4. When the data of working temperature, network signal strength and battery power are abnormal, the alarm module will issue an alarm and display it on the visual display module. When the data of working temperature, network signal strength and battery power are all good, but the slave clock has multiple time difference alarms, the prediction unit will predict that the performance of the corresponding slave clock has degraded. At this time, the monitoring center will lower the time difference threshold between the corresponding slave clock and the master clock through the threshold adjustment unit, thereby reducing the range of the corresponding slave clock time fluctuation that triggers the sub-alarm; S5. When the number of alarms of the same slave clock exceeds a predetermined number and the time interval between two alarms is less than a predetermined value, it indicates that the corresponding slave clock is damaged. The monitoring center dispatches staff to replace the corresponding slave clock through the dispatch switching unit.

[0012] As a further improvement of the present application, when the time difference threshold is lowered, the reduction range is no more than 1 / 3 of the standard threshold, and the threshold after the reduction is a secondary threshold, which is represented by b.

[0013] As a further improvement of the present application, for the master clock, the monitoring method of the time difference monitoring module includes the following steps: Sa, the calculation unit calculates the time difference between the two master clocks in real time, and compares the calculated time difference with the threshold. When it is less than the threshold, it indicates that the two master clocks are normal; Sb, when it is greater than the threshold, compare the time data of multiple working slave clocks, and use the average value of the time of multiple slave clocks with small dispersion as the control time; Sc. Compare the time of the two master clocks with the reference time, and select the master clock that is closer to the reference time. The other master clock is abnormal. At this time, the sub-alarm alarm sounds an alarm. At the same time, the monitoring center switches the status of the two master clocks through the scheduling switching module, so that the master clock closer to the reference time works; Sd. Finally, the abnormal master clock is synchronized through GPS timing to correct its abnormal time so that it can be used again.

[0014] As a further improvement of the present application, when step Sb performs the comparison time calculation, the slave clocks that have been subjected to the threshold reduction processing are first eliminated, and then the 1-3 groups of slave clocks with the largest time differences are eliminated, and the remaining multiple slave clocks are identified as multiple slave clocks with small discreteness.

[0015] As a further improvement of the present application, the slave clocks that are eliminated due to large time differences are recorded as pseudo-abnormal slave clocks. The monitoring system also includes a threshold optimization module, a data storage module and a data processing module. The data storage module is used to store the time data of multiple slave clocks, the number of slave clock anomalies counted in the statistical unit, and the number of times the pseudo-abnormal slave clock data is eliminated in step Sb. The threshold optimization module is connected to the monitoring center signal, and the data storage module and the data processing module are connected to the prediction unit signal.

[0016] As another improvement of the present application, in step S4, when the prediction unit performs performance evaluation based on the clock operating temperature, network signal strength and battery power, as the performance decreases, the threshold adjustment unit controls the threshold gradient to decrease until it decreases to b.

[0017] As another improved supplement of the present application, multiple slave clocks are installed with LED light strips, which are composed of multiple LED lamp beads, and the multiple lamp beads light up as the threshold value decreases.

[0018] To sum up, through the setting of the time difference monitoring module, on the one hand, the time difference between the slave clock and the master clock, and between the two master clocks can be monitored in real time; on the other hand, the performance of the slave clock can be evaluated and predicted, and the standard threshold between the slave clock with poor performance and the master clock can be lowered, so that the slave clock with poor performance can trigger an alarm when a small time fluctuation occurs, thereby switching to a normal slave clock. Compared with the setting of the time difference threshold with uniform performance for good and bad in the prior art, the consistency of the power plant time is effectively guaranteed. In addition, the two master clocks with inconsistent time can be distinguished by inverse selection, and the abnormality of the master clock can be detected in time, thereby further improving the maintenance of the power plant time consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the main system block diagram of the first embodiment of this application; Figure 2 This is a main block diagram of the time difference monitoring module of the first embodiment of the present application; Figure 3 This is a flow chart of the time difference monitoring module monitoring the slave clock in the first embodiment of the present application; Figure 4 A schematic diagram of the time difference between multiple slave clocks and a master clock according to the first embodiment of the present application; Figure 5 This is a schematic diagram of the time differences between multiple slave clocks and the master clock after the threshold is lowered due to an abnormality in the slave clock in the first embodiment of the present application; Figure 6 This is a flow chart of the first embodiment of the present application when the time difference monitoring module monitors the master clock; Figure 7 This is a schematic diagram of eliminating slave clock data with poor stability when calculating the comparison time according to the first embodiment of the present application; Figure 8 This is a comparison chart of the standard threshold reduction in the second embodiment of the present application and the standard threshold reduction in the first embodiment; Figure 9 This is a schematic diagram of an LED light strip in the second embodiment of the present application. DETAILED DESCRIPTION

[0020] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0021] The first implementation method: Figure 1 Shown is a monitoring system for power plant clock timing equipment, including a monitoring center, a visual display module, a time difference monitoring module, an alarm module, a communication module, multiple slave clocks respectively installed on electrical equipment in the power plant, a master clock installed in the monitoring center, and a sensor group respectively installed on the master clock and the slave clock. The communication module is used for time synchronization communication between the master clock and the slave clocks. The visual display module, the time difference monitoring module, the communication module, the alarm module, the sensor group, the master clock and the slave clock are all connected to the monitoring center signal. The monitoring system also includes a scheduling switching module. Two master clocks are set, and two slave clocks are also set on each electrical equipment. The two slave clocks and the two master clocks do not work at the same time. The slave clocks and the master clock that are not working serve as backup clocks.

[0022] like Figure 2 The time difference monitoring module includes a calculation unit, a sub-alarm, a prediction unit, a statistical unit and a threshold adjustment unit. A standard threshold is set in the calculation unit. The standard threshold is represented by a. The standard threshold represents the time difference between two master clocks and between a slave clock in working state and the master clock.

[0023] In the monitoring system for the clock timing equipment of the power plant, the time difference monitoring module is configured. On the one hand, the time difference between the slave clock and the master clock, and between the two master clocks, can be monitored in real time. On the other hand, the performance of the slave clocks can be evaluated and predicted, and the standard threshold between the slave clock with poor performance and the master clock can be lowered. As a result, the slave clock with poor performance can trigger an alarm when a small time fluctuation occurs, thereby switching to a normal slave clock. Compared with the prior art that sets a uniform time difference threshold for both good and bad performance, this effectively ensures the consistency of the power plant time. In addition, two master clocks with inconsistent times can be distinguished by reverse selection, thereby promptly detecting anomalies in the master clock, further improving the maintenance of the power plant time consistency. By developing a time synchronization protocol to connect with satellite time protocol parsing and digitization, the master clock, slave clock time and satellite time are synchronized and corrected, realizing the correlation of numerous equipment in the power plant and monitoring the normal timing status, which is of great significance and role in the production and safety protection of the power plant.

[0024] like Figure 3 ,For the slave clock, the monitoring method of the time difference monitoring module ,includes the following steps: S1. First, the calculation unit calculates the time difference between the working slave clock and the working master clock in real time, and compares it with a standard threshold preset in the calculation unit. When the time difference is less than the standard threshold, it indicates that the slave clock is normal; S2, such as Figure 4 When the time difference is greater than the standard threshold, it indicates that there is an abnormality in the slave clock. At this time, the sub-alarm will sound an alarm. At the same time, the monitoring center switches the status of the two slave clocks through the scheduling switching module, so that the backup slave clock replaces the abnormal slave clock. At the same time, the monitoring center controls the working master clock to re-time the abnormal slave clock under the action of the time synchronization protocol, so that the slave clock time returns to normal; S3. The statistical unit collects statistics on the abnormal conditions of each slave clock, including the number of alarm triggering times and time intervals, and feeds the abnormal conditions back to the prediction unit. Each time the prediction unit receives an abnormality from a slave clock, it retrieves the data on the operating temperature, network signal strength, and battery power of the abnormal slave clock detected by the sensor group at the corresponding time point, and then evaluates and predicts the corresponding abnormal slave clock based on the above data. S4, such as Figure 5When the data of working temperature, network signal strength and battery power are abnormal, the alarm module will issue an alarm and display it on the visual display module. When the data of working temperature, network signal strength and battery power are all good, the slave clock has multiple time difference abnormal alarms, then the prediction unit predicts that the performance of the corresponding slave clock has degraded. At this time, the monitoring center lowers the time difference threshold between the corresponding slave clock and the master clock through the threshold adjustment unit, thereby narrowing the range of the corresponding slave clock time fluctuation triggering the sub-alarm; S5. When the number of alarms of the same slave clock exceeds a predetermined number and the time interval between two alarms is less than a predetermined value, it indicates that the corresponding slave clock is damaged. The monitoring center dispatches staff to replace the corresponding slave clock through the dispatch switching unit.

[0025] When the time difference threshold is lowered, the reduction range should not exceed 1 / 3 of the standard threshold, and the threshold after the reduction is a secondary threshold, represented by b. If the threshold reduction range is too small, for the slave clock with deteriorating performance, the range of its time fluctuation triggering alarm will not change much, resulting in the impact of clock performance on clock consistency not being fully displayed. If the reduction range is too large, it is easy to cause the abnormal slave clock frequency to trigger an alarm, which may easily lead to distorted alarm results.

[0026] like Figure 6 ,For the master clock, the monitoring method of the time difference monitoring module includes the following steps: Sa, the calculation unit calculates the time difference between the two master clocks in real time, and compares the calculated time difference with the threshold. When it is less than the threshold, it indicates that the two master clocks are normal; Sb, when it is greater than the threshold, compare the time data of multiple working slave clocks, and use the average value of the time of multiple slave clocks with small dispersion as the control time; Sc. Compare the time of the two master clocks with the reference time, and select the master clock that is closer to the reference time. The other master clock is abnormal. At this time, the sub-alarm alarm sounds an alarm. At the same time, the monitoring center switches the status of the two master clocks through the scheduling switching module, so that the master clock closer to the reference time works; Sd. Finally, the abnormal master clock is synchronized through GPS timing to correct its abnormal time so that it can be used again.

[0027] like Figure 7When step Sb performs the reference time calculation, the slave clocks that have undergone the threshold reduction processing are first eliminated, and then the 1-3 groups of slave clocks with the largest time differences are eliminated. This can eliminate the data of the slave clocks with large time fluctuations, thereby effectively ensuring that the reference time is closer to the accurate time during calculation, and the remaining multiple slave clocks are identified as multiple slave clocks with small discreteness. At this time, the remaining multiple slave clocks have never experienced anomalies and have good performance. The time data of these slave clocks is relatively stable, and the accuracy is better when the normal master clock is selected for calculation of the reference time. When the master clock has an anomaly, the abnormal master clock can be eliminated in a timely manner, effectively ensuring that the time between various devices in the entire power plant is not easily disrupted due to the anomaly of the master clock, thereby effectively ensuring the stable and safe operation of various devices in the power plant.

[0028] The slave clocks that are eliminated due to large time differences are recorded as pseudo-abnormal slave clocks. The monitoring system also includes a threshold optimization module, a data storage module and a data processing module. The data storage module is used to store the time data of multiple slave clocks, the number of slave clock anomalies counted in the statistical unit, and the number of times the pseudo-abnormal slave clock data is eliminated in step Sb. The threshold optimization module is connected to the monitoring center signal, and the data storage module and the data processing module are connected to the prediction unit signal. The prediction unit can monitor the pseudo-abnormal slave clocks based on the data stored in the data storage module and the processing results of the data module. By analyzing these data, the trend of equipment performance degradation or potential failure mode can be identified, providing a basis for preventive maintenance. For these slave clocks that have not yet been determined to be abnormal, predictions can be made in advance and corresponding maintenance can be provided, effectively avoiding the situation where replacement is carried out after the abnormality occurs, and effectively ensuring the synchronization of power plant time.

[0029] At the same time, when false abnormal slave clocks frequently appear, it means that the range of the standard threshold is too strict or inaccurate. The threshold optimization module can optimize the standard threshold by analyzing this data to improve the stability and accuracy of the time synchronization system.

[0030] In summary, through the setting of the time difference monitoring module, on the one hand, the time difference between the slave clock and the master clock, and between the two master clocks can be monitored in real time; on the other hand, the performance of the slave clock can be evaluated and predicted, and the standard threshold between the slave clock with poor performance and the master clock can be lowered, so that the slave clock with poor performance can trigger an alarm when a small time fluctuation occurs, thereby switching to a normal slave clock. Compared with the setting of the time difference threshold with uniform performance for good and bad in the prior art, the consistency of the power plant time is effectively guaranteed. In addition, the two master clocks with inconsistent time can be distinguished by inverse selection, and the abnormality of the master clock can be detected in time, thereby further improving the maintenance of the power plant time consistency.

[0031] Second implementation method: This embodiment is based on the first embodiment, but changes the threshold adjustment method. The rest of the method remains the same as the first embodiment.

[0032] Figure 8 As shown, in step S4, when the prediction unit performs performance evaluation based on the operating temperature, network signal strength, and battery power of the slave clock, as the performance decreases, the threshold adjustment unit controls the threshold gradient to decrease until it stops when it decreases to b. The threshold shows a dynamic gradient change, which can adjust the alarm threshold in real time as the performance of the corresponding slave clock changes, thereby enabling the slave clock with poor performance to switch and re-time more quickly, thereby further improving the time consistency of various equipment in the power plant.

[0033] Multiple slave clocks are equipped with LED light strips, which are composed of multiple LED lamp beads. Multiple lamp beads light up as the threshold value decreases. As the gradient of the threshold value decreases, more lamp beads are lit. When inspecting various equipment in the power plant, staff can infer the changes in the threshold value based on the lighting status of the lamp beads, and then infer the performance of the corresponding slave clocks. Targeted inspection and maintenance can be carried out on slave clocks with poor performance to assist them in restoring performance, thereby better maintaining the consistency of the power plant time.

[0034] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A monitoring system for clock timing equipment in a power plant, characterized in that: It includes a monitoring center, a visual display module, a time difference monitoring module, an alarm module, a communication module, a plurality of slave clocks respectively installed on electrical equipment in the power plant, two master clocks installed in the monitoring center, and sensor groups respectively installed on the master clock and the slave clock. The communication module is used for time synchronization communication between the master clock and the slave clock. The visual display module, the time difference monitoring module, the communication module, the alarm module, the sensor group, the master clock and the slave clock are all connected to the monitoring center signal; The time difference monitoring module includes a calculation unit, a sub-alarm, a prediction unit, a statistical unit and a threshold adjustment unit. A standard threshold is set in the calculation unit. The standard threshold is represented by a. The standard threshold represents the time difference between two master clocks and between a slave clock in a working state and the master clock.

2. A monitoring system for clock timing equipment in a power plant according to claim 1, characterized in that: The monitoring system also includes a scheduling switching module. Two slave clocks are also set on each of the electrical devices, and the two slave clocks and the two master clocks do not work at the same time. The slave clocks and the master clock that are not working serve as backup clocks.

3. A monitoring system for clock timing equipment in a power plant according to claim 2, characterized in that: For the slave clock, the monitoring method of the time difference monitoring module includes the following steps: S1. First, the calculation unit calculates the time difference between the working slave clock and the working master clock in real time, and compares it with the standard threshold preset in the calculation unit. When the time difference is less than the standard threshold, it indicates that the slave clock is normal. S2. When the time difference is greater than the standard threshold, it indicates that the slave clock is abnormal. At this time, the sub-alarm sounds an alarm. At the same time, the monitoring center switches the states of the two slave clocks through the scheduling switching module, so that the standby slave clock replaces the abnormal slave clock. At the same time, the monitoring center controls the working master clock to re-time the abnormal slave clock under the action of the time synchronization protocol, so that the slave clock time returns to normal; S3, the statistical unit counts the abnormal conditions of each slave clock, including the number of alarm triggering and the time interval, and feeds back the abnormal conditions to the prediction unit. Each time the prediction unit receives an abnormality of a slave clock, it retrieves the data of the working temperature, network signal strength and battery power of the abnormal slave clock detected by the sensor group at the corresponding time point, and then evaluates and predicts the corresponding abnormal slave clock based on the above data; S4. When the data of working temperature, network signal strength and battery power are abnormal, the alarm module will give an alarm and display it on the visual display module. When the data of working temperature, network signal strength and battery power are all good, the slave clock has multiple time difference abnormal alarms, then the prediction unit predicts that the performance of the corresponding slave clock will deteriorate. At this time, the monitoring center will lower the time difference threshold between the corresponding slave clock and the master clock through the threshold adjustment unit, thereby reducing the scope of the corresponding slave clock time fluctuation triggering the sub-alarm; S5. When the number of alarms of the same slave clock exceeds the preset number and the time interval between two alarms is lower than the preset value, it indicates that the corresponding slave clock is damaged. The monitoring center dispatches staff to replace the corresponding slave clock through the dispatch switching unit.

4. A monitoring system for clock timing equipment in a power plant according to claim 3, characterized in that: When the time difference threshold is lowered, the lowering amplitude is no greater than 1 / 3 of the standard threshold, and the threshold after the lowering is a secondary threshold, which is represented by b.

5. A monitoring system for clock timing equipment in a power plant according to claim 1, characterized in that: For the master clock, the monitoring method of the time difference monitoring module includes the following steps: Sa, the calculation unit calculates the time difference between the two master clocks in real time, and compares the calculated time difference with a threshold value. When the time difference is less than the threshold value, it indicates that the two master clocks are normal; Sb, when it is greater than the threshold, compare the time data of multiple working slave clocks, and take the average value of the time of multiple slave clocks with small discreteness as the control time; Sc. Compare the time of the two master clocks with the control time, and select the master clock that is closer to the control time. The other master clock is an abnormal clock. At this time, the sub-alarm alarms, and the monitoring center switches the status of the two master clocks through the scheduling switching module, so that the master clock that is closer to the control time works; Sd. Finally, the abnormal master clock is synchronized through GPS timing to correct its abnormal time so that it can be used again.

6. A monitoring system for clock timing equipment in a power plant according to claim 5, characterized in that: When the step Sb performs the comparison time calculation, the slave clocks that have been subjected to the threshold reduction processing are first eliminated, and then the 1-3 groups of slave clocks with the largest time differences are eliminated, and the remaining multiple slave clocks are identified as multiple slave clocks with small discreteness.

7. A monitoring system for clock timing equipment in a power plant according to claim 6, characterized in that: The slave clocks eliminated due to large time differences are recorded as pseudo-abnormal slave clocks. The monitoring system also includes a threshold optimization module, a data storage module and a data processing module. The data storage module is used to store time data of multiple slave clocks, the number of slave clock abnormalities counted in the statistical unit, and the number of pseudo-abnormal slave clock data eliminated in step Sb. The threshold optimization module is connected to the monitoring center signal, and the data storage module and the data processing module are connected to the prediction unit signal.

8. A monitoring system for clock timing equipment in a power plant according to claim 4, characterized in that: In the step S4, when the prediction unit performs performance evaluation based on the operating temperature of the slave clock, the network signal strength and the battery power, as the performance decreases, the threshold adjustment unit controls the threshold gradient to decrease until it decreases to b and stops. Multiple slave clocks are equipped with LED light strips, which are composed of multiple LED lamp beads, and the multiple lamp beads light up as the threshold decreases.

Images