JPS6043711A - Display device for transient phenomenon data - Google Patents

Abstract

PURPOSE:To understand the change of a related process point by catching a trigger when a trip is produced to preserve automatically data obtained before and after generation of the trip and at the same time displaying those data in curves. CONSTITUTION:When a plant has a trip, the signal produced by the trip is read to a starting means 11 by a detector 1 for process state quantity via a plant input device 2. Thus a start point C is instantaneously turned on, and the process state quantity having the casual relation with the trip is shifted to the 1st trip data preserving memory 12 from a data preserving memory 7. When both start points B and D are turned on at a time, the present value of a process point having the casual relation with the trip is preserved periodically to the 2nd trip data preserving memory 13 by means of a present value renewing means 6. Thus the transient state change produced after generation of the trip is preserved. Furthermore a display mode selecting means 8 is switched to a trip analysis mode B when the operator delivers a display request through a console 5. Then the contents of memories 12 and 13 are displayed in curves by a display control part 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention provides a process state layer in plant monitoring of a power generation plant, etc. that records the history of process state quantities during preloading at the time of an operator's request and before and after a plant trip. It relates to a device that automatically stores and displays curves on the screen.

[Technical background of the invention and its problems]

For plant monitoring operators, it is an important task to understand moment-to-moment changes in process state quantities, including past movement history. The present invention relates to a function for displaying changes in complex process state quantities from the past to the present on a display screen as curve data, and the prior art will be explained based on FIG. 1.

When an operator monitors a process, the operator operates the operator console 5 to set a plurality of process points that are closely related to each other and sets them in advance using the item setting means 4. 1 from the plant to the plant input device 2.

Next, the process state 11 read by the data collecting means 3 is saved at time n, but in order to collect only preset process points, the data collecting means 3 reads the points set by the item setting means 4. However, if you always save data at regular intervals, for example, in units of several seconds,
The amount of memory used also increases with the passage of time. Additionally, as the number of process points from which data is collected increases, the memory capacity for storage also increases. Although this display function will be realized as part of the functions of a single gage system for plants, there is generally a limit to the usable memory capacity in such a system.

Therefore, data is always stored in the data storage memory 7 at regular intervals by the data collection means 3, and the capacity of the memory is that it can store data for a certain amount of time, that is, from the current time to several minutes in the past. It will be limited.

The data storage memory is shown in FIG. 2 and FIG. 3, and the storage method will be specifically explained below. Now, as an example, if you make it possible to save data for the past 1.5 minutes every minute, each slot number will be assigned to each of the process state quantity data of a specified number of points every minute, and slot numbers will be sequentially assigned from 1 to 2. No. 3・
...Considering circular buffers up to No. 16, if the process state quantity at the current time is stored in the memory of slot No. 7 in Figure 2, looking at the state of this storage memory, The memory in slot No. 6 is the process state amount from one minute ago, and the memory in slot No. 8 is the process state amount from 15 minutes ago. Further, FIG. 3 shows the memory state after one minute has passed. If the process state amount at the current time is stored in the memory in slot No. 8, the memory in slot No. 7 will store the process state amount from one minute ago. The number becomes the process state quantity from 15 minutes ago.

The slot number that controls this storage memory is stored, and process state quantities can be retrieved from the storage memory in chronological order when requested by an operator. Here, data is simply saved in one-minute intervals and basically the same method is used.

On the other hand, when an operator needs historical data on process status during plant operation, the mepelator console 5
When a display request is made from , the display mode selection means 8 switches to the history curve display mode A, and the display control unit 9 selects a display from the time of the request before the past specified time (in this case, the past 15 minutes) according to the stored slot number. The process state quantities at the same time are retrieved from the data storage memory 7 and output for display. An example of displaying the dependency curve is shown in FIG. This screen displays the changes in process state quantities at four points from 15 minutes ago to the present as a curve. In the figure, the horizontal axis indicates the time axis; -15 indicates 15 minutes ago, -10 indicates 10 minutes ago, -5 indicates 5 minutes ago, and O indicates the current time.

The vertical axis indicates a scale corresponding to each process state quantity.

If you display the four main process variables in a power plant, for example, main steam temperature, main steam pressure, reheat steam temperature, and reheat steam pressure, on the screen, you will be able to see changes in the plant status.
It is possible to see how the process state quantities at the four points described above change, and how the correlation between these four mutually closely related process states changes over time.

When the display of the past curve data on the left half of the screen is finished in the above manner, the display mode selection means 8 is switched to the current value update mode B, and the current value update means 6 is activated. The item setting means 4 determines the process point designated by the operator, periodically updates the current value (process state quantity at the current time), and outputs it to the display control section 9. The display control section 9 converts the current value into a predetermined thumb mat and displays it on the display 10 in order to display the curve.

An example of this is shown in FIG. The current value is then updated on the right screen, and the current value is updated as a curve until the curve display is displayed on the right screen. 1, that is, when the current value periodically changes to the right screen, 0 indicates the current time and -30 indicates the process state quantity 30 minutes ago. If the right screen in FIG. 5 becomes too dark, the next update will move the 15 minutes of data on the right screen to the left screen as shown in FIG. 6, and redisplay the bus line data. Furthermore, you can update the current value on the right screen and continuously monitor changes in process status quantities over time.

However, in plant monitoring, it is not possible to predict when a plant accident will occur, so there may be a discrepancy between the time required by the operator and the required data before and after the plant accident. It had a function called a dedicated trip analysis log, which outputs the time when data was saved and changes in multiple process status quantities to a printer.

Therefore, operators have to replace the printed data with graphs to check the degree of change in process points, the relationship between processes, etc., and analyze the causes of plant trips, which takes a lot of time and effort. The purpose of the invention is to detect the event of a transient state change of multiple process quantities that are extremely closely related and mutually related in a plant state where a certain event such as a plant trip or an alarm occurs. The object of the present invention is to obtain a transient phenomenon data display device that displays a curve centered on .

[Summary of the invention]

The present invention uses curve data to analyze the context of transient state change data, such as when a plant trips, so that operators can easily understand moment-by-moment changes in process acid, including past history. It is characterized by the following.

[Embodiments of the invention]

FIG. 7 shows an embodiment of the present invention in which, for example, when a plant trips, the plant can be tripped by using the means 11 for capturing and starting a contact change of the plant input and the trip data storage memory 12.13. !The data between before and after the trip is automatically saved, and when the operator requests display later, the relationship before and after the trip can be displayed as transient state change curve data. be.

If the plant trips, a trigger (
A signal caused by a contact change) is read into the activation means 11. Then, the instantaneous starting point C is turned ON, and the process state quantities that are causally related to the trip are transferred from the data storage memory 7 to the first trip data storage memory 12. This data is historical data from the time when the plant trips to the past specified time. When starting points B and D are turned on at the same time, the current value updating means 6 starts periodically saving the current values of process points that are causally related to the trip in the second trip data storage memory 13, and after the trip occurs, Stores transient state changes.

Further, when the operator requests a display from the operator console 5 in order to analyze historical data and post-trip state changes regarding the cause of the trip, the display mode selection means 8 is switched to the trip analysis mode E, and the display control unit 9 Data from the first trip data storage memory 12 that stores the B-calendar data up to the trip and the second trip data storage memory 13 that updates and stores state changes after the trip is displayed in a predetermined manner as a curve. Convert it to a format and output it to the display IO.

The trip data storage memory 13 has memory for a certain fixed amount of time in order to update data after a trip. Therefore, when an operator makes a request after a trip, the data stored up to the time of the request can be displayed as a curve, and thereafter the data can be displayed as a curve every moment until the updated data is saved.

FIG. 8 shows an example of a curve display format for trip analysis. O on the horizontal axis indicates the time when the trip occurred, and from this point on, the left half of the screen shows the 15 minutes of past distribution history data until the trip, and the right half of the screen shows the change in data after the trip. be.

As described above, after a trip occurs, the operator switches the trip analysis mode E of the display mode selection means 8 using the operator console 5 to display a curve on the display 10, and selects the display mode as shown in FIG. In order to automatically switch the trip analysis mode E of the means 8, a timer 14 is added, and when a trip occurs in the plant, the starting means 11 starts the timer 14 by a trigger (contact change), a trip occurs, and 'C remains constant. It is also possible to automatically display the curve on the display 10 after a certain period of time. By setting the timer 14 to zero, process data can be displayed over time at the same time as an abnormality such as a trip occurs.

It is also possible to store the trip data storage memory 12 and the trip data storage memory 13 using completely different storage means and transfer the data to the trip data storage memory 12 and the trip data storage memory 13 again for display. It is.

〔Effect of the invention〕

As described above, the trigger is captured when a trip occurs, and
Automatically saves data before and after a trip occurs, and
At the operator's request, the data can be displayed as a curve, so that changes in interrelated process points can be quickly grasped at a glance when analyzing the cause of a trip. Compared to the previous analysis of printed data called trip analysis logs, the time and effort required for the user to analyze the cause will be reduced.

[Brief explanation of the drawing]

Figure 1 is a block diagram of the power plant monitoring system, Figure 2 is an explanatory diagram of an example of saving history data for the past 15 minutes, Figure 3 is an explanatory diagram of an example of saving 1 minute after Figure 2, and Figure 4 is an explanatory diagram of an example of saving historical data for the past 15 minutes. The figure is a characteristic diagram of submission data for the past 15 minutes after the request, Figure 5 1
Figure 6 is a characteristic diagram of the data 15 minutes after the request, Figure 6 is a characteristic diagram when the display screen is shifted to the left, Figure 7 is a block diagram showing an embodiment of the present invention, Figure 8 is a trip diagram. FIG. 9, which is a characteristic diagram of process data in the analysis mode, is a block diagram showing another embodiment of the present invention. 1...Detector 2...Plant input/output device 3...
Data collection means 4...Item setting means 5...Communication panel 6...Current value updating means 7...Data storage memory 8
...Display mode selection means 9...Display control section 10...Display device 11...Starting means 12...Trip data storage memory 13...
Trip data storage memory (7317) Agent Patent attorney Ken Chika 1 right (
and 1 other person) - 81 Figure 1 Figure 2 Figure 3 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] When monitoring a plant such as a power generation process, a detector that detects various state quantities of the plant, a plant input device that reads signals from the detector when the state changes or at regular intervals, and various state quantities of the plant are related. an operator console for freely setting items within the group; an item setting means for setting items in response to requests from the operator console; A data collection means to collect data, a data storage memory to store data for a certain period of time, and a screen that displays process status quantities up to the requested time after the past specified time when a display request is made by the operator when the plant is in a normal state. In a display device for displaying a curve, the display device comprises a current value updating means for displaying a curve on a curve and updating and displaying the current value at a constant cycle thereafter; A first trip data storage memory 2 that stores the contents of the accident state and a second trip data storage memory 2 that constantly collects data at a specified period and stores it even after a state change is added. A transient phenomenon data display device characterized by displaying data as a curve and making it possible to analyze the causes of plant abnormalities.