JPS63106012A - Plant accident analyzer - Google Patents

Abstract

PURPOSE:To accurately recognize the changing time and the sequence of the state of a plant, by detecting a timing when a remote computer detects the generation of a first accident, by a time on a remote side on the remote computer side, and the time on a host computer side. CONSTITUTION:The remote computer 2, when detecting the generation of the first accident, turns on a first accident information signal (d), and informs the fact to the host computer 4, and also, transmits reference time information on the remote side stored with signal information being stored until then to the host computer 4 as sequence information (e). The host computer 4 stores an accident generated timing as the reference time information on the host side. And the absolute times Tf1-Tfn of received sequence information (e) are converted to host side times Th1-Thn so that a remote side reference time coincides with a host side reference time, and trip sequence log information (f) is outputted. In such a way, an operator can recognize accurately the sequence of the change of the state generated in a thermal power generation plant 1 at a host side time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an accident analysis device in a plant such as a thermal power plant.

(Prior Art) In recent years, plant control systems for thermal power plants have become increasingly decentralized and hierarchical, along with central control computer systems.

Figure 5 shows a block configuration diagram of a conventional plant accident analysis device for such a thermal power plant. A plurality of remote computers 2 and a transmission device i! 3 and a host computer 4.

Each remote computer 2 receives process information a for each system from the thermal power plant 1 . This process information a includes information indicating the progress of the process sequence within the thermal power plant 1 and trip sequence information indicating the occurrence of an accident, and is input as a contact signal. The remote computer 2 constantly monitors the process information a input in this way.

When the contact signal changes, the state of the contact signal that changes each time is read as signal information. Further, it is determined whether the process information a indicates that an accident has occurred for the first time.

At this time, the signal information read above is 1, for example, as shown in Fig. 6 (
As shown in a), the flag P indicating whether it is the first accident, the bit Q indicating the changed state of the contact, the signal number R of the contact, and the time on the remote side when the above change occurred. It is managed based on the expressed change time S.

The above-mentioned remote time is the time that each remote computer 2 measures internally, and is an absolute time that cannot be changed by an operator's console operation or the like.

When the remote computer 2 determines that the input signal information does not indicate the occurrence of the first accident, the remote computer 2 sequentially stores the signal information.

On the other hand, if we determine that it is some kind of accident.

Flag P indicating the first accident is set, and then.

It is sent to the transmission device 3 as sequence information together with the signal information stored up to that point. Further, subsequently, the signal information to be captured as described above is sequentially transmitted.

The above sequence information is as shown in FIG. 6(b).
Following the header, the above signal information is sent.

In this example, the second signal information indicates the first accident. After transmitting the D-th signal information, if the remote computer 2 does not detect any change in the contact signal of the process information a for a certain period of time, for example 30 seconds, it transmits a footer and finishes transmitting the sequence information. .

In this way, each remote computer 2 transmits the sequence information to the host computer 4 via the transmission device 3.

By the way, the host computer 4 measures the year, month, day, and time that are counted each day as host-side time.

The time is always set accurately by the operator. Therefore, after receiving the sequence information, the host computer 4 converts the data indicated by the remote time to the normal time.

This sets the time on the host side in the host computer 4 at the time when the signal information data indicating the occurrence of the first accident in the sequence information is received as the accident occurrence time. That is, the sequence information shown in FIG. 6(b) is used to notify that the first accident has occurred and that the time of occurrence is the remote side time fk. At this time, the host computer 4, as shown in FIG.
is determined at the time of the first accident above. And this time T
1 to (k-1) in FIG. 6(b) based on hk
)-th data corresponding to the i-th time Thi is shown in the upper row of FIG.
-Tfi). Also, at the same time (k+1)~
The j-th time Thj corresponding to the n-th data is expressed by the formula Thi = Thk + (Tf
i - Tfk).

The host computer 4 thus converts the remote side time expression of the sequence information received from the remote computer 2 into the host computer side time expression. Then, as shown in FIG. 8, as sequence log information C, the above 1 to n
The th signal information is outputted to a CRT monitor or recording paper in the form of a list. In this output, a mark 11*1g is added to the beginning of the k-th signal name, indicating that this is the first accident.

Using this sequence log information C, the operator examines the temporal progress of each process sequence and trip sequence before and after the first accident occurs.

The cause of the plant accident will be analyzed.

(Problem to be Solved by the Invention) By the way, in a case where one cause that occurs in the thermal power plant 1 affects each system, and the occurrence of an accident in the plant is detected one after another almost simultaneously by a plurality of remote computers 2. There is. In this case, each remote computer 2 sends a message to the host computer 4 as described above. ! 3, the sequence information is transmitted one after another. On the other hand, when the host computer 4 detects signal information indicating the occurrence of the first accident in each piece of sequence information b, it processes the host-side time at that time as the time when the first accident occurs, and outputs sequence log information C.

For this reason, for example, if two remote computers 2 detect the first accident at the same time and simultaneously transmit the sequence information, a time lag will occur at the time of the processing in the host computer 4 due to the transmission delay. This poses a problem in that the exact time when the accident occurred in each system is not known, and the order in which changes in each system occurred cannot be determined, making it difficult to analyze the cause of the accident.

Therefore, an object of the present invention is to solve the above problems and provide a plant accident analysis device that facilitates analysis of the cause of an accident by accurately maintaining the order of trip sequence information captured by each remote computer. .

[Configuration of the Invention (Means for Solving Problems) Therefore, in the present invention, when the remote computer detects the occurrence of the first accident, the remote computer sets the remote side time and the host side time at that time as the respective standards. When notifying the host computer directly via the process output device by turning on the first accident notification signal to determine the time, and then transmitting sequence information to the host computer.

While transmitting the remote side time at the time when the first accident notification signal is turned on as remote side reference time information, the host computer detects the time when the first accident notification signal is turned on and sets that time as the host side reference time, Based on this host side reference time and the transmitted remote side reference time,
The time on the remote side in the transmitted sequence information is converted into the time expression on the host computer side, and trip sequence log information is output.

(Operation) Since the host side reference time detected by the host computer and the remote side reference time transmitted from the remote computer indicate the same point in time, the remote side time in the sequence information is set on the host computer side based on this point. It can be converted to the time of As a result, each piece of trip sequence information sent from each remote computer can be output as a log in the order of its occurrence time.

(Example) Hereinafter, one embodiment of the present invention will be described in detail.

FIG. 1 is a block diagram of a plant accident analysis device according to an embodiment of the present invention.

The same reference numerals as in FIG. 5 indicate the same or corresponding parts.

Process information a for each system is input from the thermal power plant 1 to the remote computer 2 . This process information a
There are sequence information indicating the progress of the process sequence in the plant 1 and trip sequence information indicating the occurrence of an accident, and these are input as contact signals.

The remote computer 2 constantly monitors the process information a inputted through the process input bag [21].

When any of the contact signals changes, the sequence information input means 22 reads the changed signal information each time and stores it one item at a time in the format shown in FIG. 2(a). That is, P is a flag indicating that it is the first accident, Q is a bit indicating whether the contact signal has changed to the on side or the off side, and R is the process information a.
The signal number assigned to each contact signal, S, is the change time of that signal indicated by the remote side time. This remote time is the time measured by each remote computer 2 as described above.

The process information a includes information that simply indicates the progress state of the process sequence and information that indicates accident information. usually,
When an accident occurs, a predetermined trip sequence is executed to maintain the safety of plant equipment, and the execution status of the sequence is notified by process information a. The trip sequence determination processing means 23 determines whether the signal information taken into the trip sequence input device 22 is
This is to determine whether or not it indicates an accident as described above.

When the trip sequence determination processing means 23 determines that the first signal information indicating an accident as described above has been taken in, it sets a predetermined code to the flag P shown in FIG. The notification signal d is turned on for a certain period of time. This first accident notification signal d is a 1-bit on/off signal. The process output device 24 receives this signal d and outputs it to the process input bag [21] and the host computer 4.

When the first accident notification signal d is turned on, the process input device 21 passes this to the sequence information input means 22.
Based on this, the sequence information input means 22, in the same way as when detecting the change in the process information a,
Data in the format shown in FIG. 2(a) is created. That is, the signal number R is set to rd indicating the first accident notification signal, and the remote side time S is set to the signal d.
The time Tfr at which this was detected is set as the reference time information on the remote computer side.

On the other hand, the trip sequence determination processing means 23.

After turning on the first accident notification signal d for a certain period of time.

The transmission and transmission means 25 takes in the signal information stored in the sequence information input means 22 via the trip sequence determination processing means 23. Next, the transmission and transmission means 25 inputs the signal information stored in the sequence information input means 22, as shown in FIG. 2(b). A header indicating the start of the transmission data is added to the beginning of the information, and the information is sent to the transmission device 3 as sequence information e. The transmission device 3 transmits the information e to the host 1-computer 4.

Here, the sequence information e to be transmitted will be explained using an example shown in FIG. 2(b). In the case of FIG. 6B, the occurrence of the first accident is determined based on the signal information read by the process input device 21.

Remote calculation Ia2 is the previously stored signal information
, and then transmits the information Y created using the first accident notification signal. Further, when a change in process information a is detected continuously after transmitting this information Y, the signal information Z is sequentially transmitted in the same manner as described above in order to notify the state of the change. Then, when the next change in process information a is not detected for a certain period of time, such as 30 seconds, it is assumed that the state change has ended, a footer indicating the end of sequence information e is added, and the transmission is ended.

On the other hand, in the host computer 4, when the first accident notification signal d is turned on, the process input device 41 notifies the time determination means 42 of this. In the host computer 4, as described above, the 0 time determination means 42, which measures the time Th expressed in the year, month, day, hour, minute, and second used in daily life, determines the time when the first accident notification signal d is turned on. hr is determined and stored as the reference time on the host computer side. Moreover, the transmission receiving means 43 is a transmission bag [! The sequence information e transmitted from 13 is received.

By the way, in the sequence information e, each signal information is indicated by the remote side time Tf of the remote computer 2, which is different from the host side time Th of the host computer 4 side, as shown in FIG. 2(b). There is. on the other hand.

The timing when the first accident notification signal d is turned on, expressed as the time Tf on the remote computer 2 side, is the time Tfr notified by the signal information Y in FIG. 2(b). Further, the above timing, expressed as host side time Th, is the time Thr determined by the time determining means 42. So this same timing! ! Accordingly, each of the remote side times Tf1 to Tfn notified in FIG. 2(b) is converted to host side times Th+ to Thn.

Here, as shown in FIG. 3(a), the above times Tfr and T
The respective times are made to correspond to each other with hr as the same time point. Then,
The remote side time Tfk of the second signal information is .

The formula Thk shown in the middle part of FIG. 3(b), = Thr −(
Tfr - Tfk) can be converted to the host side time Thk.

In addition, the remote side time Tfi of the signal information up to the second signal information is determined by the formula Thi = Thr − (
Tfr - Tfi), it can be converted to the host side time Thi. Similarly, the remote side time Tfj of the signal information after the th is expressed by the formula Thj =
Host side time T from Thr + (Tfj −Tfr)
It can be converted to hj.

The time correction means 44 adjusts the remote side times Tfx to Tfn in the sequence information e received by the transmission reception means 43.
The host side time Th1 is determined by each equation shown in FIG. 3(b).
~Convert to Tfn. The trip sequence log output means 45 outputs the sequence information e converted to the host side time Thi to the CRT as trip sequence log information f.
Output to a monitor or recording paper.

An example of the output format of this trip sequence log information f is shown in FIG. 4, in which fl is the name of the system of the thermal power plant, and fl and f3 are headings of display information. Further, fa is the signal number R1f5 is the corresponding signal name, sfg is the time on the host side at which the signal corresponding to each item above changed, and f7 is the signal name f5 indicating the state after the change of the signal. Items marked with a ``*'' mark indicate that this is the first accident. fa indicates the elapsed time at which each item has changed since the first accident occurred.

Such trip sequence log information f is.

It can be arbitrarily output for each system corresponding to each remote computer 2 or for all systems.

Using this trip sequence log information f, the operator can grasp changes in the state of the thermal power plant 1 and analyze the cause of the accident.

At this time, the change time of each signal in each system is accurately displayed as the host side time Th. Therefore, even if an accident that occurs in one system spreads to another system and another accident occurs in that system, the time and order of the accident can be accurately determined. This results in
Compared to the past, where it was not possible to accurately determine the time and order in which an accident occurred, it is now easier to analyze the cause of the accident.

As described above, according to this embodiment, when the remote computer 2 detects the occurrence of the first accident, it turns on the first accident notification signal d and notifies the host computer 4, and also uses the timing of the accident occurrence as remote-side reference time information. While remembering,
The remote reference time information stored above is transmitted to the host computer 4 as sequence information e together with the signal information stored up to that point. When the first accident notification signal d is turned on, the host computer 4 stores the accident occurrence timing as host-side reference time information. Then, the absolute time Tf 1- of the received sequence information e is set so that the remote reference time and the host reference time match.
Converts Tfn to host side time Tht to Thn, and outputs trip sequence log information f.

This allows the operator to accurately grasp the order of state changes occurring within the thermal power plant 1 based on the time on the host side, making it easier to analyze the cause of the accident.

[Effects of the Invention] As described above, according to the present invention, when the remote computer detects the occurrence of the first accident, the timing is detected based on the remote time on the remote computer side and the time on the host computer side, and the time on the host computer side is detected. The computer converts the remote side time in the sequence information to the host computer's time expression based on both times, and outputs the trip sequence log information, so the time and order of changes in plant status can be changed. Since it can be accurately grasped, it becomes easier to analyze the cause of the accident.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram of a plant accident analysis device according to an embodiment of the present invention, FIG. 2(a) is an explanatory diagram of a storage format of signal information, FIG. Figure 3 (a) is an explanatory diagram showing the conversion of the remote time on the remote computer side to the time on the host computer side;
b) is a diagram showing a calculation formula for converting the time;
FIG. 4 is a diagram showing the output format of trip sequence log information, and FIG. 5 is a block diagram of a conventional plant accident analysis device. FIG. 6(a) is an explanatory diagram of the storage format of signal information;
7(b) is an explanatory diagram of sequence information, FIG. 7(a) is an explanatory diagram showing the conversion of the remote time on the remote computer side to the host computer side time in the conventional case,
b) is a diagram showing a calculation formula for determining the time, and FIG. 8 is a schematic diagram of the output format of trip sequence log information. 1... Thermal power plant, 2... Remote computer. 3...Transmission device, 4...Host computer, 21...
Process input device, 22...Sequence information input means, 23...Trip sequence determination processing means, 24
. . . Process output device, 25 . . . Transmission sending means, 4
1... Process input device, 42... Time determination means,
43... Transmission/reception means, 44... Time conversion means, 4
5... Trip sequence log output means. ,′−ゝ・ Agent Patent Attorney Crest 1) Makoto:゛、、、−−′
. (a) (b) Figure 2 (i) (k) (j) (a) Figure 3 (a) Figure 6 (i) (k) (i) (a) Figure 7

Claims (1)

[Claims] For plant accidents, when an accident occurs in a plant, the status changes of each part of the plant are distributed to multiple remote computers, and the collected sequence information with time stamps is sent to the host computer via a transmission device for accident analysis. In the analysis device, each of the remote computers determines a plant accident based on the information imported from the plant, and when a plant accident is determined, first accident occurrence information is transmitted to the host computer and remote computer through the process output device. The host computer is provided with a trip sequence determination processing means that directly inputs the information to the process input device, and the host computer receives the trip sequence determination processing means that inputs the information directly to the process input device via the transmission device based on the first accident occurrence information that is directly input from the remote computer. A plant accident analysis device comprising a time correction means for correcting the time on the remote computer side of sequence information to the time on the host computer side.