JPS60326A - plant monitoring equipment - Google Patents

Abstract

PURPOSE:To cope with abnormality also at the transient duration of a plant by providing the titled device with a detector of an input signal to a component, a model having the similar characteristics to that of the component and a model having the similar characteristic to that of the plant device. CONSTITUTION:When it is supposed that the cause of the abnormality is the trouble of the component 25, an input signal to the component 25 is detected by the detector 26. The output of the detector 26 is inputted to the model 27 having the similar characteristics to that of the component 25 through a converter 5. An adder 29 adds the output of the model 27 with a surplus value E1 to obtain a signal value 30 having a component dynamic limit regulating the component 25 dynamically in accordance with the movement of the component 25. Consequently, a limit checkers 10 outputs a precise start instruction 11 also at the transient duration of the plant.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conventional plant monitoring device that monitors a plant and outputs an appropriate message when an abnormality is detected.

Conventionally, there has been a device as shown in FIG. 1 as this type of device. In Figure 1, 1 is a plant, 2 is a plant 1
A device that constitutes part 0 and has the characteristic that if it becomes abnormal, the influence will spread to other parts of the plant 1, and 3 is a type of abnormality that occurs in device 2 (for example, high temperature, low pressure, etc.) The detector outputs signal 4. A converter 5 converts the voltage level of the signal 4 and outputs the signal 6. 7
A detector detects a process quantity that has some kind of causal relationship with the process quantity detected by the detector 3, and a computer 8 includes a plant diagnosis logic 9 configured by software and a display device (for example, a CRT) not shown.

10 is a limit checker with a software configuration that inputs the signal 6 of the converter 5 and outputs it at a level earlier than the normal alarm level of the plant 10, that is, at a level on the safe side of the plant 10. )11 is output. 12 is a start command (signal) for the plant diagnosis logic 9;

In the plant diagnosis logic 9, 13 is an observable point (hereinafter referred to as a node) that is detected as a warning in the plant diagnosis logic 9 when the signal 11 of the limit checker 10 is turned on, and 14 is the node 13. Similarly, a node detected in the plant diagnosis logic 9 and connected to the detector I of the plant 1 (observable information)
, 15 is an AND gate, 16 is an OR gate, 17 is the minimum time delay (τ, ) among the time delays that occur when going from the lower node 13 to the upper node 19, 1B
is a message that is output after the node 13 is detected as a warning and the cause is determined to be in the node 14, and is an instruction to prevent the abnormal state from spreading, and 19 is a message that is delayed by a time τ5 from the node 13. ．． A node is detected after the logical sum of τ4, 20 is a node in the final state where the abnormality extends, and 21 is a point. This is a virtual point where no Reference numeral 22 denotes a virtual logic, which is provided corresponding to the unobservable point 21 and simulates the route through which its influence spreads. 23 is a virtual node corresponding to point 21. A message 24 is additionally provided in the node 13 to correspond to the point 21, the temporary empty logic 22, and the node 23, and instructs to avoid an abnormal state.

Next, the operation will be explained.

The signals output from the detectors 3 and 7 of the device 2 are converted by respective converters 5 and input to a limit checker 10 of the computer 8. limit checker 10
When the signal 11 is output, that is, when it turns on, the activation command 1 is activated.
2 activates the plant diagnostic logic 9 and signals 1
1 is detected at node 13. It is known in advance that the abnormality in the detector 3 is due to the influence from the detector 7 or others, and the logic of the causal relationship is based on the AND gate 1.
5 and ORGATE 16. Therefore, if an abnormality is detected at the time when the plant diagnosis logic 9 is started and before the node 14 reaches the alarm level, the cause of step 7 is that a situation occurs where the node 14 is detected. That's true. Furthermore, detector 3
It is determined that the cause of the abnormality is an abnormality in the detector 7, and a message 18 is output to the operator in order to prevent this abnormality from spreading.

Furthermore, when the plant diagnosis logic 9 is activated and the node 13 is detected, the logic above it is checked. As a result, the next possible state of the plant 1 can be predicted, and the operator can take precautionary measures to avoid reaching the final state of the node 20. In addition, since the minimum possible time τ in plant 1 is set between node 13 and node 19, if node 19 is detected within a shorter time than time τ after node 13 is detected. If this occurs, it is determined that there is a failure in the detector 2 on the plant 1 side that detects the node 19.

To communicate these causes and future predictions to operators.
This diagnostic logic 9 of the plant 1 is displayed on a display device in the format shown in the figure, and the abnormal state quantities and messages 18 of the detectors 3 and 1 are displayed on the displayed nodes 13 and 14, respectively.
additionally displayed. This allows the operator to
It is possible to accurately grasp the state of the abnormal state and perform operations to avoid the abnormal state. However, after an abnormality was detected at node 13, in order to investigate the cause of the abnormality, the 7th node below node 13 was investigated, but no abnormality was detected at the node (cause identification failure). determines that the cause of the abnormality is an abnormality at an unobservable point 21 within the plant 1, that is, the node 23 is abnormal.・Please note that this message 24
consists of content that the cause of the abnormality is in an unobserved node, for example, node 23, and also includes instructions for operations in accordance with this.

Therefore, when the cause of the abnormality is assumed to be a failure of a component in the device 2 or the detector 7, the limit checker 10 does not operate in accordance with the movement of the component, so the limit value will be changed during the transient of the plant. It becomes invalid. Similarly, at nodes other than the node indicating the cause, such as nodes 13, 19, and 20, their limit checkers 10 do not accurately correspond to the system (equipment) status, so their limit values are unique during plant transients. It becomes something that cannot be determined and has no validity.

Therefore, all nodes are turned on inadvertently, resulting in inappropriate instructional messages during plant transients.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and it is possible to provide a node indicating the cause of a failure of a component with a model equivalent to that component, and use this to determine the limit value of the component. Than,
The object is to provide a plant diagnostic device that can match the movement of components.

An embodiment of the present invention will be described below with reference to the drawings. Second
In the figure, numerals 1 to 24 represent the same functions as in FIG. However, 7 is a detector that detects an output signal from one component constituting the device 2. 25 is one component in the device 2, 26 is the component 2
27 is a model that simulates component 25, that is, exhibits characteristics equivalent to this; 29 is an adder that adds a predetermined margin value E□ and the output of model #27; A signal 30 having component dynamic limit values dynamically defining the failure of the component is output. 31 is a model simulating device 2;
2 is a model simulating the component 25. 34
is an adder that adds the margin value E2 to give the model 31 a margin and the output of the model 31, and outputs a system level dynamic limit value signal 35 that dynamically defines a failure at the device 2 level in the plant 1. .

Next, the operation will be explained. Operations 1 to 24 are the first
This is similar to the conventional plant monitoring device shown in the figure. When the detector 7 is a detector that detects the output signal of one component 25 that constitutes the device 2, that is, when it is assumed that the cause of the abnormality is a failure of the component 25, the input signal to the component 25 is detected by the detector 26. The output of the detector 26 is input via the converter 5 to a model 27 exhibiting characteristics similar to those of the component 25. The output of the model 21 is added to the margin value E1 by the adder 29.
is added to obtain a signal value 30 having a component dynamic limit dynamically defined in accordance with the motion of the component 25. As a result, the limit check 10 issues an accurate start-up command 11 even when the plant is in transition. For example, at the node 13, by adding the margin value E2 to the input of the model 310 having the same characteristics as the device 2, the signal 35 dynamically defines the failure of the device 2 in a manner consistent with its movement.
is determined. As a result, all nodes including the nodes 13 and 14 in the plant diagnosis logic 9 can provide appropriate information to the operator even during plant transitions, making it possible to avoid plant abnormalities.

In addition, in the above embodiment, it is easy for those skilled in the art to replace the parts realized by software with hardware.

As described above, according to the present invention, a plant is equipped with a detector for input signals to a component of plant equipment, a model having characteristics equivalent to this component, and a model having characteristics equivalent to the plant equipment. This has the effect of being able to deal with abnormalities even in transient states.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional plant monitoring device, and FIG. 2 is a block diagram showing an embodiment of the plant monitoring device of the present invention. 1...Plant, 3.7.26...Detector, 5...
・Converter, 8--Computer, 9... Plant diagnostic logic, 10... Limit checker, 13, 1
4゜19.20,23...node, 15...and gate, 16--or gate, 21...point, 22...low-air logic, 23--low-air node, 2
5...Component, 27,31.32...Model, 29°34...Adder. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa Procedural Amendment (Voluntary) 1. Indication of the case Japanese Patent Application No. 58-108611 2, Name of the invention Plant monitoring device 3, Representative Hitoshi Katayama of the person making the amendment Part 5, Subject of amendment (1) Claims column of the specification (21 specifications) Column for detailed explanation of the invention in the book + 31 Column for brief explanation of drawings in the specification 6 Contents of amendment (1) Amend the scope of claims in the appendix. <21 Line 17 of page 2 of the specification From line 18 on the same page. From line 1 on page 3 to line 2 on the same page. Line 10 on page 4.
From line 10 of page 4 to line 11 of the same page, line 15 of page 6 to line 16 of the same page, line 20 of page 6 to line 1 of page 7, line 9 of page 9. Line 6, page 10, line 12, [Limit checker] is corrected to read "Limit check." 7. Scope of patent claims after amendment of catalog of attached documents? 1 or more claims after correction A second abnormality in which the output of a detector that detects the process amount input to a specific part of the plant is set to a safer side than a predetermined first abnormality level. In a plant monitoring device that performs the above diagnosis using the output of the detector as an input condition of a logical decision tree for diagnosing the above plant when the level is indicated, the response characteristic 'fiL that simulates the above specific part, the above A model in which the output of the detector is introduced, an adder that adds a predetermined margin value to the cutting edge of this model, and the second
A plant monitoring device characterized by comprising a limit check for detecting an abnormal level.

Claims (1)

[Claims] When the output of a detector that detects the process amount input to a specific part of the plant indicates a second abnormality level that is set to be safer than a predetermined first abnormality level, the output of the detector is transmitted to the plant. In a plant monitoring device that performs the above diagnosis as an input condition for a logical decision tree for diagnosis, there is a model that has a response characteristic that simulates the above specific part and that introduces the output of the above detector, and a model that incorporates the output of this model. A plant monitor comprising: an adder that adds a predetermined margin value; and a limit checker that detects the second abnormality level based on the output of the adder and a status signal detected from the specific portion. Device.