JPS6116307A - Plant abnormality diagnostic device - Google Patents

Abstract

PURPOSE:To find the cause of abnormality in the early stage and to quicken restoration by indicating restoration operating procedures in accordance with outputs of an abnormality cause diagnostic part and a plant state monitor part which discriminates the abnormal state of a plant on a basis of the combination of process values on the outside of an allowable range. CONSTITUTION:A plant abnormality diagnostic device inputs the process signal, which is obtained from a plant 1 at intervals of a certain time, to a plant state monitor part 4 and an abnormality cause diagnostic part 5 through a signal transmitter 2. This monitor part 4 sets preliminarily thresholds for principal process values and discriminates whether process values are within these set values or not, and if they are on the outside of the allowable range, the monitor part 4 discriminates what abnormal state the plant 1 is in and how to do, and results are inputted to a restoring operation search part 7. The abnormality cause diagnostic part 5 detects the cause of abnormality in the early stage on a basis of the combination of states of process signals and presents the restoring operation to prevent spread of abnormality propagation, and devices related to the restoring operation are searched by said search part 7.

Description

[Detailed description of the invention] [Invention! [Technical Field] The present invention relates to a plant abnormality diagnosis device that diagnoses abnormalities in a plant.

[Technical background of the invention and its problems] A method for diagnosing abnormality in a plant using process number 46 obtained from the plant is to express the causal relationship of abnormality propagation in a tree form using logical symbols, and to create the logical tree. There is a way to find out the cause of plant abnormality, current status, and predicted future changes in plant status from changes in process signals. In this plant diagnosis method, the abnormality propagation is expressed in a tree-like manner, so if a previously assumed abnormality occurs, the cause of the abnormality can be found early and the problem can be corrected using a logical tree. Propagation can be predicted. However, when an unexpected abnormality occurs, that is, an abnormality that is not represented on the logical tree, there is a problem in that it is impossible to diagnose the abnormality according to the logical tree. be. Furthermore, since the propagation of anomalies is expressed in a unidirectional manner on the logical tree, if the plant state is heading towards recovery due to manual or automatic operation, it may become impossible to deal with subsequent changes in the plant state. There is a case. Moreover, since the conventional diagnostic plastics method only considers - one steady state, the steady state after a change in plant output is regarded as an abnormality, and there is a possibility that correct diagnosis may not be possible. Therefore, there has been a demand for the development of a plant abnormality/normal diagnosis device that can perform abnormality diagnosis even after a plant recovery operation is initiated or when a plant output is changed.

[Object of the Invention] The present invention has been made in view of the above circumstances, and its purpose is to quickly eliminate plant abnormalities not only when the cause of the abnormality is determined, but also when the cause of the abnormality is not determined. The purpose of the present invention is to provide a system for diagnosing plant abnormalities that can be used to detect and correct plant conditions.

[Summary of the Invention] In order to achieve the above object, the present invention includes a signal transmission device that inputs process signals collected from a plant, and a signal transmission device that inputs process signals from the signal transmission device every hour (261J process number). a plant condition monitoring section that determines an abnormal state of the plant by combining process values outside the allowable range among the process signals of the lever; and an abnormality cause diagnosis section that diagnoses the cause of the plant abnormality based on the combination of the states of the process signals; a recovery operation exploration unit that inputs respective output signals from the plant condition monitoring unit and the abnormality cause diagnosis unit and instructs a follow-up operation for the abnormal state of the plant;
The present invention relates to a plant abnormality diagnosing device comprising the plant condition monitoring section, the abnormality cause diagnosing section, and the recovery operation exploration section (diagnosis result display section displaying the double-sided diagnosis results).

[Embodiments of the invention] Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of the present invention, in which process signals obtained from a plant 1 at regular intervals are inputted to a plant status monitoring section 4 and an abnormality cause diagnosis section 5 via a signal transmission device 2.

In the plant condition monitoring unit 4, a W)L threshold value is set in advance for the main process values of the plant according to the output of the plant, and it is determined whether or not there is a process value within this threshold range, and it is determined whether or not the process value is within the range of the threshold value. If there is a process value that is out of range, W .

For example, FIG. 2 shows an example of the results of six disconnections of the first part of plant condition monitoring when an abnormality diagnosis of an effusion water atomic couplant is carried out. In this figure, the O mark in the upper row 15 indicates the reactor pressure 1
1, live steam flow rate 12, and core flow rate 14 are within the allowable range (-
Yes, the mark on the upper row 15 indicates the reactor water level 10 and the water supply flow rate 13
is below the allowable value. The ↓ mark in the lower row 16 shows the direction of the rate of change of the process signal, indicating that the reactor water level 10 and the feed water flow rate 13 are decreasing. When the process (n) is below the allowable value and the direction of change is rising, it is determined that the process is decreasing. It is necessary to increase the live steam flow rate or reduce the core flow rate to decrease the live steam flow rate, and this fact is input to the time<W operation exploration section 7.

In addition, the abnormality cause diagnosis unit 5 detects the cause of abnormality in the plant at an early stage based on a combination of the states of process signals, and when the cause of the abnormality is detected, displays a recovery operation to prevent the spread of the abnormality, and at the same time The fact that a certain device cannot be used is input to the recovery operation exploration section 7. In this case, the state of the process signal depends on whether the signal exceeds a threshold value set in advance for each analog signal when it is an analog signal, and whether it is on or off when it is an ift information body digital signal. Check the state of the process signal according to the state.

For example, an example of the database 6 of the abnormality cause diagnosis section 5 is shown in FIG. 171-i is a signal when the output of the main water supply controller has decreased, 181-j is a signal when the main water supply controller is under automatic control, and 19 is a signal when the input of the main water supply controller has not decreased. Water supply main controller low side failure 20 is A
The ND gate 21 is activated when the above signals 17, 18, and 19 are both established, and at this time, the operation guide that is manually controlled by the controller of each water pump is presented, and the water feed king controller is activated. This is input to the recovery operation exploration unit 7.

Furthermore, the rotation operation exploration section 7 searches for operations to correct the plant condition in response to requests from the plant condition inspection department 4.
It is checked from the state of the input/output signals of the device related to the recovery operation whether the device operates normally, and if the use of the device is not permitted, another operation is searched for. Furthermore, if it is clear from the signal from the abnormality cause diagnosis unit 5 that the device is malfunctioning, that device is excluded from the beginning of use.

For example, when a request to increase the feed water flow rate or decrease the core # amount is input from the plant condition monitoring unit 4, it is necessary to check whether the feed water pump operates normally based on the input/output signal status of the feed water pump and the related valve status. If it is normal, check the flt control gain control section of the water supply pump. That°
From the results, it is determined whether or not it can be used, and if all operations to increase the water supply flow rate are impossible, an operation to decrease the core flow rate is searched, and the results are shown in h7. Note that a priority is set for each operation to increase the water supply flow rate, and whether or not the operation is possible is determined in order of priority.

Next, the flowchart according to this embodiment is shown in FIG.

First, when an abnormality occurs in the plant in the first step 101, the cause of the abnormality is determined in the next second step 102, and if the cause of the abnormality is found, the recovery operation 1 is determined in the third step 103. ;=1~n)
Do the following. The fourth nuttub 104 determines whether or not it can be used with the qpr operation i, and determines whether it is usable or not.
In step 105, the diagnosis results are displayed. If the fourth
If not available in step 104, proceed to sixth step 10.
6, the third step 1 on the condition that i (n holds true)
03 is updated to 1+1 and thereafter the above-described procedure is repeated until the recovery operation becomes available. If the cause of the abnormality is not found in the second step 102 or if i (n does not hold) in the sixth step 106, f''Lld
In the seventh step 107, the plant status was determined. In the eighth step 108, the recovery operation f'\J was determined, and in the ninth step 109, the recovery operation (71j was performed to determine whether it could be used). If it is usable, it will be 0, which will clearly show the diagnosis result in the next fifth step 105, and
If the recovery operation J is not usable at the ninth step 109, it is updated to i+1 and input to the eighth step 108, and from then on, it is supplied until the recovery operation becomes usable! It will be returned to you.

Effect of one shot, one kill] According to the plant abnormality diagnosis device of the present invention, abnormality cause diagnosis
・] If the cause of the abnormality is detected at an early stage, the IRF can be restored and the plant condition can be restored. In addition, if the cause of the abnormality is not determined, the plant status monitoring unit monitors the balance status of the plant even when recovery operations are being performed, so the abnormality can be detected and detected.
Plant status can be restored.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the present invention; Fig. 2 is a diagram showing an example of the diagnosis results of the plant condition monitoring unit shown in Fig. 1; Fig. 3 shows the abnormality cause diagnosis shown in Fig. 1. Figure 4 shows an example of the database of the department.
Flowchart 01...Plant 2
... Signal transmission device 3, 6.8... Database 4... Plant condition monitoring section 5... Abnormality cause diagnosis section 7... Recovery operation exploration section 9.
...Diagnostic Results Display Department Agent Patent Attorney Yoshiaki Inomata (and 1 other person) 1st
Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] (1) A signal transmission device that inputs process signals collected from the plant; and a signal transmission device that inputs the process signals from the signal transmission device at regular intervals, and detects the plant by combining the process values of the process signals that are outside the allowable range. A plant condition monitoring section that determines an abnormal condition, an abnormality cause diagnosis section that diagnoses the cause of an abnormality in the plant based on a combination of states of the process signals, and input signals from the plant condition monitoring section and the abnormality cause diagnosis section, respectively. a recovery operation exploration unit that instructs a recovery operation procedure for an abnormal state of the plant; and a diagnosis result display unit that displays the diagnosis results of the plant status monitoring unit, the abnormality cause diagnosis unit, and the recovery operation exploration unit. A plant abnormality diagnosis device characterized by: