KR20090024055A - Method and system for tracing trip-cause in industrial plant - Google Patents

Abstract

A method and a system for tracing trip-cause in an industrial plant are provided to deal with the trip rapidly by finding a signal that is the trip-cause by back-tracing the trip logic. A trip logic unit(204) includes one logic operator or more, receives a logic input signal, and outputs a trip determination signal. A storage unit(206) stores the logic input signal and an internal signal inside the trip logic unit. A tracing unit(208) searches the storage unit when the trip value is confirmed by checking a trip determination signal and detects the logic input signal that causes the trip by checking the input signal for the recently changed trip determination signal before outputting the trip value and the logic input signal reversely step by step.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a system for tripping cause of an industrial plant,

And more particularly, to a method and system for tracking trip cause of an industrial plant. More particularly, the present invention relates to a trip cause tracking method and a system for tracking a trip cause, which has the same trip logic as the logic for detecting a trip in the control system of an industrial plant and traces the trip logic when a trip occurs to find a signal causing a trip .

If a trip accident occurs suddenly during normal operation of the plant, it will cause a huge loss in production and cause new loss for restart. Also, it will cause big damage such as economic damage due to shutdown . It is therefore important to quickly identify the cause of the trip and take appropriate action to quickly re-start to minimize the economic impact of plant downtime.

Generally, when a trip occurs in an industrial plant, the cause of the trip is empirically referred to the event log, the SOE (Sequence Of Event) report and the trend curve, and the plant's distributed control system (DCS) control logic and the emergency operation procedure manual are all performed manually.

As computer and software technology advances, distributed control system performance improvement and advanced control technology continue to improve. However, there is no system for professionally analyzing the causes of trips in Korea as well as overseas, and only limited functions are applied to some foreign DCS It is reality that there is. In addition, since the cause of the trip is absolutely dependent on a small number of skilled workers or experienced persons who are skilled in the plant operation and industrial plant control system logic drawings, it is impossible to identify the problem in a timely manner A problem arises.

Moreover, in the absence of experts or experienced workers, it is difficult to quickly identify the cause and take measures, resulting in a long period of suspension and excessive cost loss due to shutdown. In addition, even in the process of analyzing experts and experienced workers, analysis and control of the plant's distributed control system control logic diagram and SOE report are handled and analyzed individually. Therefore, it takes much time and effort to analyze the incident, In the case of a trip accident caused by the same momentary influence, the cause may be dependent only on the estimation, so that it is not necessary to quickly identify the cause and restart it, which causes a problem that the plant becomes a heavy burden.

In order to solve the above-mentioned problems, the present invention has the same trip logic as the logic for detecting the trip in the control system of the industrial plant, so that when the trip occurs, the trip logic is traced back to find the signal causing the trip .

According to another aspect of the present invention, there is provided a trip cause tracking system for an industrial plant, comprising: a trip circuit for receiving a logic input signal and outputting a trip decision signal, A storage unit for storing an internal signal in the trip circuit and a storage unit for storing the trip signal and the trip signal, And a tracking unit for checking the input signal in a reverse direction step by step to detect the logic input signal which causes a trip.

In order to achieve the above object, the present invention also provides a trip cause tracking method for an industrial plant of a system having a trip rope portion and a storage portion, the method comprising the steps of: (a) checking a trip decision signal of the trip rope portion, Detecting a trip and setting the trip determination signal as a tracking target; (b) searching all the input signals for the tracking object by searching the storage and detecting a current value of all the input signals; (c) The present invention detects the previous data of the current values of all the input signals, sequentially detects the previous data in reverse order based on the time at which the current value occurred, searches the storage unit, When the input signal is found, an input signal having a value different from the current value and the previous data is designated as a path signal (D) determining whether the path signal is a final signal, (e) outputting a trip path and terminating if the path signal is the final signal as a result of the determination in step (d), and (f) and if the path signal is not the final signal, setting the path signal as the tracking target and proceeding to step (b).

According to the present invention, there is provided the same trip logic as the logic for detecting the trip of the control system of the industrial plant, so that when the trip occurs, the trip logic is traced back to find the signal causing the trip, There is an effect to be able to.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention unclear.

1 is a diagram showing a control system of an industrial plant and a trip cause tracking system according to an embodiment of the present invention connected thereto.

Generally, a distributed control system (DCS) 102 is used to control a plurality of control functions, rather than concentrating control functions on an industrial plant in order to control an industrial plant.

The DCS interface 104 is for acquiring the control signal of the DCS, and may be configured as separate hardware or software. The DCS interface 104 may obtain control signals from the control network or the information network in the DCS 102. The control signals obtained at the DCS interface 104 may be transmitted over the communication network 106 to the trip cause tracking system 108 in accordance with an embodiment of the present invention.

2 is a diagram showing a trip cause tracking system of an industrial plant according to an embodiment of the present invention.

As shown in FIG. 2, a trip cause tracking system of an industrial plant according to an embodiment of the present invention includes a trip rod section 204, a storage section 206, and a tracking section 208.

Trip loop 204 includes one or more logical operators to receive a logic input signal and output a trip decision signal. In this embodiment, the logical operator means a binary logic operator and the logic input signal means a binary logic signal. Binary refers to having a value of 0 or 1. The logic input signal input to the trip circuit 204 is received when a control signal generated in the distributed control system 102 is detected by the DCS interface 104 and transmitted through the communication network 106, If the binary value is not a usable binary value, the conversion unit 202 is further connected to convert the converted control signal into a logic signal according to a predetermined conversion condition to generate a logic input signal .

The conversion condition is defined as a condition for defining a trip set point of an input control signal and converting it into a binary value so that one of two values of 1 or 0 is output. For example, when the conversion condition of the control signal transmitted from the temperature sensor is defined as " 1 is output as a logic input signal when input is 30 DEG C or more, and 0 is output as a logic input signal when input is less than 30 DEG C " If the control signal is 30 ° C or more, 1 is output as the logic input signal. If the control signal is less than 30 ° C, 0 is output as the logic input signal. Here, the conversion condition is not limited to one, and several conversion conditions can be applied successively. For example, in addition to the conversion condition for integrating the transferred control signal, a conversion condition of "outputting 1 as a logic input signal if input is over 30 ° C and outputting 0 as a logic input signal if input is less than 30 ° C" can be additionally connected .

The storage 206 stores the logic input signal and the internal signal of the trip circuit 204.

Meanwhile, the trip logic unit may include an internal conversion logic for receiving an internal signal and outputting an output according to a predetermined condition. For example, timer logic may be included to cause an internal signal to be output three seconds later.

7 is a diagram showing a trip logic section including internal conversion logic.

7, when the logic input signals 711, 712 and 713 are input to the trip logic section, internal logic such as the timer logic 722 as well as the AND gate 721 and the OR gate 723 in the triproot section, May exist. In this case, when a predetermined condition of " output after 3 seconds " is given to the timer logic, the first internal signal 714 is input to the timer logic 722, and after the delay time of 3 seconds, And is output as an internal signal 715.

7, the signals stored in the storage unit 206 are logic input signals 711, 712, and 713 and first internal signals 714 and second internal signals 715 as internal signals.

The tracing unit 208 searches the storage unit 206 for a trip determination signal 704 output from the trip circuit unit 204. The tracing unit 208 searches for a trip decision signal 704 from the input signal to the logic input signal in a stepwise manner to detect the logic input signal that causes the trip.

The process of the tracking unit 208 detecting the logic determination signal output from the trip circuit 204 and detecting the logic input signal causing the trip will be described in detail with reference to FIG.

3 is a detailed view of the conversion section 202 and the triproot section 204 in the trip cause tracking system of an industrial plant according to an embodiment of the present invention.

As shown in FIG. 3, in the trip cause tracking system of the industrial plant according to the embodiment of the present invention, five control signals for monitoring trip occurrence are input to the converter 202, And a first conversion unit, a second conversion unit, a third conversion unit, a fourth conversion unit and a fifth conversion unit having respective conversion conditions for the control signal. Also, as shown in FIG. 3, the trip roughening portion 204 may constitute a trip logic portion including an AND gate, an OR gate, and the like. In this embodiment, the trip loop section 204 is composed of a first AND gate 321, a second AND gate 322, a first OR gate 323 and a second OR gate 324.

3, the first control signal 341, the second control signal 342, the third control signal 343, the fourth control signal 344 and the fifth control signal 345, which are five control signals, Are respectively converted into logical input signals by the first conversion unit 331, the second conversion unit 332, the third conversion unit 333, the fourth conversion unit 334 and the fifth conversion unit 335, Converted into a C1 signal 311, a C2 signal 312, a C3 signal 313, a C4 signal 314 and a C5 signal 315 to be input to the trip circuit section 204. At this time, if there is a control signal that is transmitted as a binary code value that can be input to the trip line section 204, the conversion section may bypass the delay line and transmit the same to the trip line section 204 immediately. That is, in this case, the conversion condition is "output 1 as a logic input signal if the input is 1, and output 0 as the logic input signal if the input is 0".

The A1 signal 301 which is the output of the first AND gate 321, the A2 signal 302 which is the output of the second AND gate 322 and the output B1 of the first OR gate 323 are stored in the storage 206, A signal 303 is stored as an internal signal and the C1 signal 311, C2 signal 312, C3 signal 313, C4 signal 314 and C5 signal 315 are also stored.

Assume that the trip decision signal 304, which is the output of the trip loop 204 in FIG. 3, is a trip value.

If it is determined that the trip value is a result of checking the trip determination signal, the storage unit is searched to check stepwise from the input signal to the logic input signal for the trip change determination signal that has recently changed before the trip value is output, Signal. At this time, internal signals located on a path to be confirmed in the stepwise check from the input signal to the logic input signal in the reverse direction are also checked. That is, as shown in Fig. 3, the trip determination signal 304, the A1 signal 301, and the C2 signal 312 are checked step by step.

The process of tracking the C2 signal 312 is as follows. If the input of the trip circuit 204 is the same as the input of the C1 signal 311 = 1, the C2 signal 312 = 0, the C3 signal 313 = 0, the C4 signal 314 = 0 and the C5 signal 315 = 0 (A1 signal 301 = 0, A2 signal 302 = 0, B1 signal 303 = 0), the trip decision signal 304 also becomes 0 and the trip decision signal (304) becomes a normal value, not a trip value.

Here, it is assumed that the value of the second control signal 342 changes and the C2 signal 312 changes from 0 to 1. Then, the A1 signal 301, which is one of the internal signals, is changed to 1, so that the trip determination signal 304, which is the output of the second OR gate 324, That is, the trip determination signal 304 becomes the trip value.

If the trip determination signal 304 becomes a trip value, the tracking unit 208 refers back to the data obtained from the previous data stored in the storage unit 206 to back-track the logic of the trip circuit, Track.

Therefore, when the trip determination signal 304 becomes the trip value, the tracking unit 208 detects the changed input signal among the input signals of the second OR gate 324 and changes the A1 signal 301 from 0 to 1 immediately before the trip Can be detected. It is also possible to detect that the C2 signal 312 has changed from 0 to 1 immediately before the trip by detecting the inverted input signal of the input signal of the first AND gate 321 by tracing back the A1 signal 301 in succession. Since the internal signal of the trip circuit 204 is not present before the detected C2 signal 312, it is determined that the C2 signal 312 is the final signal, and the second control, which is the signal before the conversion into the logic input signal of the C2 signal 312, The facility that generated the signal is determined to be the equipment that caused the trip. The method of tracking and tracking the data of the storage unit in backward tracking of the trip generation facility after the occurrence of the trip will be described in detail in the following description of the trip cause tracking method of the industrial plant according to the embodiment of the present invention .

4 is a flowchart showing a trip cause tracking method of an industrial plant according to an embodiment of the present invention.

4, when the input of the trip rou- tine portion 204 is (C1 signal 311 = 1, C2 signal 312 = 0, C3 signal 313 = 0, C4 A case where a C2 signal 312 is changed from 0 to 1 in a state where the signal 314 = 0 and the C5 signal 315 = 0 is shown and a trip occurs.

When a trip decision signal of the trip rope 204 is detected and a trip of the industrial plant is sensed (S402), the trip decision signal is set as a trace object and stored in the trip path (S404).

After setting the tracking target to the storage unit 206, all the input signals for the tracking target are searched and the current values of all the input signals are detected (S406). The A1 signal 301 and the A2 signal 302, which are the input signals of the trip decision signal 304, and detects the current values (A1 signal = 1, A2 signal = 0).

After detecting the current value of all the input signals, the storage unit 206 is inquired to detect the previous data of the current values of all the input signals, and sequentially detects the previous data in reverse order based on the time at which the current value occurred, And an input signal having a value different from the current value and the previous data when the input signal having a value different from the previous data is found is executed as the path signal. The description will be given in Fig. 5 and Fig.

5 is a diagram showing changes in the A1 signal 301 and the B1 signal 303 at the time of trip occurrence.

In this embodiment, the time interval for detecting the trip decision signal and the internal signal is assumed to be 100 ms. As shown in FIG. 5, assume that the A1 signal and the B1 signal have changed in accordance with the passage of time at the time of occurrence of the trip. At this time, the trip occurred at 12:00: 00.000 time, that is, 12:00 am, and the present value (A1 signal = 1, B1 signal = 0).

  In this case, when the previous data of the current value is detected (S408), it is detected as data (A1 signal = 0, B1 signal = 0) occurring at 11:59:59,900 time. Therefore, when an input signal having a different value from the current value (A1 signal = 1, B1 signal = 0) is confirmed (S410), the A1 signal 301 is detected and the detected A1 signal is stored in the trip path as a path signal (S414).

After confirming A1 signal as a path signal, it is confirmed whether it is a final signal (S416). Since the A1 signal is not the final signal, the A1 signal is set as the tracking target (S420), the storage unit 206 is searched to inquire all the input signals for the tracking target, and the current values of all the input signals are detected (S406) . That is, the C1 signal 311 and the C2 signal 312 which are the input signals of the A1 signal 301 are searched to detect the current values (C1 signal = 0, C2 signal = 1).

After detecting the current value of all the input signals, the storage unit 206 is inquired to detect the previous data of the current values of all the input signals, and sequentially detects the previous data in reverse order based on the time at which the current value occurred, When the input signal having a value different from the previous data is found, the step of designating the input signal having the value different from the current value as the path signal.

6 is a diagram showing changes of the C1 signal and the C2 signal at the time of trip occurrence.

As shown in FIG. 6, assume that the A1 signal and the B1 signal have changed in accordance with the passage of time at the time of trip occurrence. At this time, the trip occurred at 12: 00: 00.000 time, that is, at 12:00, and the current value (C1 signal = 0, C2 signal = 1).

  In this case, when the previous data of the current value is detected (S408), C1 data (C1 signal = 0, C2 signal = 1) is detected as data generated at the time of 11:59:59:00. At this time, if an input signal having a different value from the current value (C1 signal = 0, C2 signal = 1) is confirmed (S410), it is found that there is no input signal having a different value.

In this case, previous data preceding by one again is detected (S408). In this case, the data (C1 signal = 0, C2 signal = 0) is detected as data generated at the time of 11:59:59:00, which is before 11:59:59,900 (S408). Therefore, when an input signal having a value different from the current value (C1 signal = 0, C2 signal = 1) is confirmed (S410), the C2 signal is detected and the detected C2 signal 312 is stored in the trip path as a path signal S414).

After confirming the C2 signal as the path signal, it is confirmed whether it is the final signal (S416). In this case, since the C2 signal is the final signal on the trip logic, the trip path is output (S418) and the process ends.

The trip path output here is the trip decision signal 304, the A1 signal 301 and the C2 signal 312.

Accordingly, if the trip path is traced back in this way, it can be understood that the second control signal 342 has caused the trip as a signal before conversion into the binary signal of the C2 signal 312, and the facility for generating the second control signal is tripped It is possible to trace the facility.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

According to the present invention, it is possible to easily identify the cause of a trip even if the operator is a non-skilled operator by providing information on the cause of trip analysis, so that quick and accurate measures can be taken when a trip occurs. It is expected that the development of new technology related to trip trace causes will improve facility management efficiency and operation rate of industrial plant, and reduce dependence on experts on trip cause analysis and countermeasure work which has many difficulties in domestic industry. Especially, it is effective not only in power plants but also in industrial fields where safety is important, such as refinery, chemical, and steel, thereby contributing to the localization of advanced control technologies and securing source technologies that escape technology dependency on foreign companies. .

1 shows a control system of an industrial plant and a trip cause tracking system of the present invention connected thereto,

2 is a diagram illustrating a trip cause tracking system of an industrial plant according to an embodiment of the present invention;

3 is a detailed view of the conversion unit and the trip logic unit in the trip cause tracking system of the industrial plant according to the embodiment of the present invention,

4 is a flowchart showing a method of tracking a cause of trip of an industrial plant according to an embodiment of the present invention;

5 is a diagram showing changes of the A1 signal and the B1 signal at the time of trip occurrence,

6 is a diagram showing a change of the C1 signal and the C2 signal at the time of trip occurrence,

7 is a diagram showing a trip logic section including internal conversion logic.

Description of the Related Art

102: Distributed control system 104: DCS interface

106: Network 108: Trip Cause Tracking System

202: conversion unit 204: triproot

206: storage unit 208:

301: A1 signal 302: A2 signal

303: B1 signal 304, 704: trip decision signal

311: C1 signal 312: C2 signal

313: C3 signal 314: C4 signal

315: C5 signal 321: first AND gate

322: second AND gate 323: first OR gate

324: second OR gate 331: first conversion section

332: second conversion section 333: third conversion section

334: fourth conversion section 335: fifth conversion section

341: first control signal 342: second control signal

343: third control signal 344: fourth control signal

345: fifth control signal 711, 712, 713: logic input signal

714: first internal signal

715: second internal signal 721: AND gate

722: Timer logic 723: OR gate

Claims (5)

CLAIMS What is claimed is: 1. A system for tracking a cause of an industrial plant, A triproot unit having one or more logical operators to receive a logic input signal and output a trip decision signal; A storage unit for storing the logic input signal and an internal signal in the trip line portion; And If it is determined that the trip value is a result of checking the trip determination signal, the storage unit is searched to check stepwise from the input signal for the trip determination signal changed recently to the logic input signal in the reverse direction before the trip value is output, And a tracking unit Wherein the trip cause tracking system comprises: 2. The system of claim 1, wherein the trip- Further comprising a conversion unit for receiving a control signal in the industrial plant, converting the control signal into a logic signal according to a predetermined conversion condition, and outputting the logic input signal. The apparatus of claim 1, wherein the trip logic unit comprises: And an internal conversion logic for receiving the internal signal and outputting an output according to a predetermined condition. CLAIMS What is claimed is: 1. A method for tracking a cause of an industrial plant in a system having a triproot portion and a storage portion, (a) confirming a trip decision signal of the trip rope so as to detect a trip of the industrial plant and setting the trip decision signal as a tracking object; (b) searching all the input signals for the tracking target by searching the storage unit and detecting the current values of all the input signals; (c) detecting previous data of the current values of all the input signals by searching the storage unit, sequentially detecting the previous data in reverse order based on the time at which the current value occurred, and comparing the current value and the previous data Designating an input signal having a value different from the current value and the previous data as a path signal when an input signal having a value is found; (d) determining whether the path signal is a final signal; (e) outputting a trip path and terminating if the path signal is the final signal as a result of the determination in step (d); And (f) if the path signal is not the final signal as a result of the determination in step (d), setting the path signal as the tracking target and proceeding to step (b) Wherein the trip cause tracking method comprises: 5. The method of claim 4, The trip decision signal, and the path signal.

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