JPS61109112A - Plant supervisory unit - Google Patents

Abstract

PURPOSE:To eliminate the misdiagnosis of an abnormality and to improve the reliability with a plant supervisory unit by providing a circuit which holds the abnormality detection input fed from a plant and catching a transient phenomenon. CONSTITUTION:The outputs of detectors 3 and 7 provided to a supervisory unit 2 of a plant 1 are supplied to a limit check device 10 of a computer 8 via each converter 5. A plant diagnosis logic 9 is started with a start instruction 12 given by the output signal 11 of the device 10. The detectors 3 and 7 detect faults, etc. with the start of the logic 9 and display them on a display device. While the load state information on the plant 1 is supplied to the device 10 via a detector 31, the converter 5 and a function generator 32. Thus the limit value accordant with said load state information is obtained. Here an abnormality phenomenon holding circuit 34 is used for delivery of the output 11 holding a logical signal. Thus even a transient abnormal phenomenon is sent accurately to the logic 9 for plant supervisory with no misdiagnosis. Then a holding release input 35 is supplied by a resetting operation when the abnormality is prevented can be.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a conventional monitoring device for monitoring all plant abnormalities.

[Conventional technology]

Conventionally, there has been a device as shown in FIG. 1 as this type of device. In Figure 1, l is a plant, 2 is a plant l
3 is a device that has the characteristic that if it becomes abnormal, the influence will spread to other parts of the plant 2. ) outputs a signal 4t-. 5 is signal 4
A signal 6 is outputted by a converter that converts the voltage level t.

7 is a detector that detects a process quantity that has some kind of causal relationship with the process quantity detected by the detector 3; 8 is a computer that includes a plant diagnosis logic 9 configured by software and a display device (for example, a CRT), not shown; @10 inputs the signal 6 of the converter 5, which is earlier than the normal alarm level of the plant 1, tI! [Jichi Plant 1
With the limit check of the software configuration that outputs at the level on the safe side, the signal (binary signal)
l′! ! - Output. Reference numeral 12 indicates a start command 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 I diagnosis logic 9 when the signal 11 of the limit check 10 is turned on, and 14 is a node. 13 is a node detected in the plant diagnostic logic 9, and is connected to the detector 7 of plan) 1. 15 is an AND gate, 16 is an OR gate, and 17 is a lower node 1.
The minimum time delay τ1.18 among the time delays that occur when reaching the upper node 19 from No. 3 is output after No. 13 is detected as a warning and the cause is determined to be No. 7-Do 14. , a message 19 consisting of an instruction to prevent further spread of the abnormal condition is transmitted from the node 13 with a time delay τ8. Node 20 detected after logical sum of τ4
is a node in the final state where the abnormality extends, and 21 is a point, which, if abnormal, affects the detector 80 portion, but is a virtual point that cannot be detected or is not provided with a detector. Reference numeral 22 denotes temporary reception logic, which is provided corresponding to the unobserved point 21 and simulates the route through which its influence spreads.

23 is a virtual node corresponding to point 21.

24 is point 21, temporary acceptance logic 22 and no)'2
This is a message that is additionally provided to correspond to No. 3 and instructs to avoid abnormal conditions.

25 is one component in the device 2; 26 is a detector for detecting an input signal to the component 25;
7 is a model that completely simulates the component 25, that is, a model with characteristics equivalent to this, and 29 is an adder that adds the output of the predetermined margin value model 27, and a signal having a dynamic limit value that dynamically defines a failure of the component. 3
Outputs 0. 31 is a detector for detecting the load condition of the plant l; 32 is an input of the output of the detector 31 via the converter 5, and the limit end required by the limit check 10 is set to 7 according to the load condition of the plant. A signal 33 is outputted by a function generator that generates a flexible limit value set in accordance with the characteristics of the plan (planned in advance) l to be changed flexibly.

Next, the operation will be explained.

The signals output from the detectors 8 and 7 of the device 2 are converted by each corresponding converter 5 to a limit check 10 of the computer 8.

When limit check 1G outputs signal 11, ie, turns on, plant diagnostic logic 9 is activated by activation command 12, and signal 11 is detected at node 13.

It is known in advance that the abnormality in the detector 8 is an influence from the detector 7 or others, and the logic of the causal relationship is simulated by the AND gate 15 and the OR gate 16. Therefore, if the plant diagnosis logic 9 is activated and an abnormality is detected before the node 14 reaches the alarm level at that point, the cause is the situation in which the node 14 is detected. It has happened. Then, it is determined that the cause of the abnormality in the detector 3 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 (Plan) 1 is predicted, and the operator can take precautions to avoid reaching the final state of node 20. In addition, when node 1″13 and node 19, the minimum possible time spread τ3 in plan )l is set, so if no r
If node 19 is detected within a time shorter than time τ8 after node 13 is detected, node 19
It is determined that there is a failure in the detector 2 on the plant 1 side that detects.

In order to convey these causes and future predictions to the operator, this plant diagnosis logic 9 is displayed on a display device in the format shown in the figure, and the abnormal state quantities of the detectors 3 and 7 are displayed on the displayed nodes 18 and 14, respectively. and additional rc display of message 18. This allows the operator to accurately grasp the state of plan (1) and accurately perform operations to avoid abnormal conditions. However, after an abnormality was detected at node 13, in order to investigate the abnormality, the nodes lower than No)'ts were investigated, but if no abnormality was detected in any node (IiA cause identification failure), an abnormality occurred. The raw yarn is a plant
Anomaly at unobservable point 21 within MIJ Chino)
23 is judged to be abnormal.

Note that this message 24 has content stating that the cause of the abnormality is in an unobserved node, for example, node 28, and also includes instructions for operations in accordance with this.

Also, a case will be described in which the detector 7 is a detector that detects an output signal of one component 25 constituting the device 2, that is, a case where it is assumed that the cause of the abnormality is a failure of the component 25. The input signal to component 25 is detected by detector 26 . The output of the detector 26 is input via the converter 5 to a model 27 which has characteristics comparable to those of the component 25. The output of model 27 is added to adder 29
is added to the margin value to obtain a signal 30 having a dynamic limit value dynamically defined in accordance with the movement of the component 25. This allows the limit
Check IO issues an accurate start-up command 11 even when the plant is changing over time.

Additionally, information regarding the load status of the plant, such as the outputs of generators, turbines, boilers, nuclear reactors, etc., is input from the plant 1 to the function generator 32 via the detector 31 and the converter 5, and the output is limited. The limit value tm that is supplied to check 10 and that satisfies the plant load condition from this
Ru.

This results in /-1'' in plant diagnostic logic 9.
All nodes including 13 and 14t can provide appropriate information to operators even during plant transitions, making it possible to avoid plant abnormalities.

Conventional plant monitoring equipment has the above configuration, and once an abnormal event occurs, once the plant passes a certain mode, the abnormal event may disappear even though there is a cause for the abnormality, and its effects can be will be received by all nodes, resulting in a misdiagnosis of plant abnormality tl.
There was a drawback that inaccurate abnormal situation avoidance operation messages were issued.

This invention was made to eliminate the above-mentioned drawbacks of the conventional method, and by installing a circuit that holds abnormality detection input from the plant, abnormal timing can be instantly detected by catching transient events. '1. It is an object of the present invention to provide a plant monitoring device that can output highly reliable messages without erroneously diagnosing plant abnormalities.

Further, the purpose is to be able to avoid the above-mentioned retention after the cause of the abnormality has been identified and countermeasures have been taken.

An embodiment of the present invention will be described below with reference to the drawings. Second
In the figure, numerals 1 to 33 represent the same parts as in FIG. 3
4 is an abnormal event holding circuit, and 35 is a holding release signal input.

Next, to explain the operations, operations 1 to 38 are the same as those of conventional plant monitoring devices.
゛Explanation of return is omitted below. An abnormal event holding circuit 34 that can output an output 11t containing a logical signal from the redundant processing unit 28 is installed so that even a transient abnormal event can be accurately transmitted to the plant diagnosis logic 9 to prevent erroneous diagnosis. Conduct monitoring. After that, when the evasion is successfully achieved, the hold release input 35 is input using the same operation as a normal reactor such as an operator.

Although this invention was realized by S/W, it can also be realized by a hard-wired one.

As described above, according to the present invention, even abnormal events that occur transiently in the plant operation mode can be detected reliably, thereby eliminating the possibility of false diagnostic sounds and providing accurate information regarding plant abnormalities. This has the effect of providing the operator with the following information.

[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-m-plant, 8, 7, 26, 31--one detector, 5--one converter, 8-m-computer, 9-m
-Plant diagnostic logic, 10---Limit check, 13,14,19,20.23---7-de, 1
5-11 Anne F Gate, 16--Or Gate, 2
1-11 point, 25-m-component, 27-
--Model, 29-m-Adder, 12--Single function generator, 34-m-Abnormal event holding circuit, 35-m-Holding release signal input. In the figures, the same reference numerals indicate the same parts. Procedural amendment group (voluntary)

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 of a logical decision tree for diagnosis, a function generator that receives the load state of the plant as input and responds according to a predetermined function, and an output of this function generator that performs the above diagnosis. A plant monitoring device comprising a first limit check for correcting a second abnormality level and further comprising an abnormal event holding and adjusting device.