JP2007221862A - Digital protection control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To update an estimation rule indicative of the causation of a failure part and a poor monitoring detection item without stopping operation. <P>SOLUTION: This digital protection controller 1 for detecting poor monitoring from monitor data transmits monitoring result data through a communication network 20. A terminal 30 receives the monitoring result data thus transmitted and estimates a failure part using the received monitoring result data according to an estimation rule 42. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a digital protection control system, and more particularly to a failure portion estimation apparatus in a digital protection control system.

  The digital type protection control device that protects the power system inputs the amount of electricity and state of the power system, converts it into a digital amount, performs a predetermined protection control calculation using this digital amount, and according to this calculation result The protection control of the power system is performed by controlling the circuit breaker and the like. Since this type of technology is already known, detailed description thereof is omitted here.

  Generally, an automatic monitoring function is incorporated in a digital protection control device so that the system protection control function, which is the responsibility of the protection control device, works normally (see, for example, Non-Patent Document 1). When a fault is detected by such an automatic monitoring function, the operator estimates the part where the fault has occurred based on the detection result, and replaces and repairs the defective part.

  However, depending on the failure aspect, when a failure is detected in a plurality of monitoring items (for example, when the A / D converter becomes defective, not only “A / D accuracy failure” but also “PT monitoring failure”, “CT "Monitoring failure" or the like is output), and the failure part may not be estimated simply.

  In such cases, in order to estimate the cause of failure, it often depends on the experience and knowledge of the operator, and as a result of erroneously determining the failure part, do not replace the failure part. There have been cases of resuming operations. This leads to problems such as the occurrence of a failure again and prolonged failure recovery time.

As a countermeasure, a failure location estimation device is mounted on the digital protection control device. This failure site estimation device estimates a failure site according to a causal relationship (estimation rule) between a predetermined failure site and a monitoring failure detection item. Even when a plurality of different failures are detected by the automatic monitoring function, This makes it possible to accurately determine the failure site. In addition, since this kind of technique is already well-known, the detailed description is abbreviate | omitted here (for example, refer patent document 1).
JP-A-8-182175 Edited by Izumi Mitani “Digital Relay Practical Reader” Ohmsha (pages 70-73)

  FIG. 10 is a diagram showing a configuration of a failure site estimation device of a conventional digital protection control device.

  In the figure, the digital protection control device 1 includes a protection control function unit 2, a monitoring control unit 10, a failure site estimation unit 40, and a failure site output unit 32.

  The digital protection control device 1 is, for example, a protection relay device.

  The protection control function unit 2 is a main function that controls protection control of the protection control device, but since it is not directly involved in the present invention, the description thereof is omitted here.

  The monitoring control unit 10 includes a monitoring failure detection unit 11 that detects a monitoring failure based on input monitoring data and a monitoring result storage unit 12 that stores monitoring result data detected by the monitoring failure detection unit 11. Is realized by software processing.

  The failure part estimation unit 40 includes failure part estimation means 41 and an estimation rule 42. The failure part estimation means 41 estimates the failure part from the monitoring result data stored in the monitoring result storage means 12 based on the estimation rule stored in the estimation rule 42, and is realized by software processing. The estimation rule 42 stores an estimation rule that indicates the causal relationship between the monitoring result data and the failure part. The failure part output means 32 outputs the failure part estimated by the failure part estimation means 41.

  In the failure part estimation, a failure detected by the monitoring failure detection means 11 is determined by the failure part estimation means 41 according to the existing estimation rule 42. This estimation rule is based on experience and knowledge. Because it is impossible to cover in advance the cause-and-effect relationship between all failure modes and failure parts, it is possible to experience failure modes that could not be initially envisioned during the operation of the equipment. Therefore, it is impossible to accurately determine the failure site.

  In such a case, it is desirable to update the estimation rule to improve the estimation accuracy of the faulty part. However, in the conventional faulty part estimation apparatus, the estimation rule is programmed in the digital protection control apparatus. For this reason, in order to update the estimation rule, it is necessary to take measures such as changing the program of the estimation rule after stopping the operation of the device. Therefore, it is difficult to update the estimation rule. There was a problem that the accuracy of was not improved.

  The present invention has been made in view of the above circumstances, and provides a digital protection control system capable of easily updating an estimation rule indicating a causal relationship between a failure part and a monitoring failure detection item without stopping operation. The purpose is to provide.

  According to the first aspect of the present invention, the cause-and-effect relationship between the means for receiving the monitoring result data based on the monitoring data sent via the network, the monitoring result data indicating the monitoring result, and the failure part to be monitored An estimation rule storage means for storing an estimation rule indicating: a means for estimating a faulty part to be monitored in accordance with the stored estimation rule from the received monitoring result data; and a means for editing the estimation rule A failure location estimation device characterized by:

  According to a second aspect of the present invention, in the first aspect, the estimation rule storage means has a plurality of types of estimation rules, and the means for estimating uses a designated estimation rule to determine a fault site. Is a failure site estimation device characterized by estimating.

  According to the third aspect of the present invention, the digital protection control device that transmits the monitoring result data obtained from the monitoring data from the monitoring target to the network, and the monitoring target data from the monitoring result data from the digital protection control device. In the digital type protection control system comprising a failure site estimation device for estimating a failure site, the failure site estimation device includes means for receiving monitoring result data based on the monitoring data sent via the network, and monitoring A monitoring result data indicating a result, an estimation rule storing means for storing an estimation rule indicating a causal relationship with the failure part, and a failure part to be monitored is estimated from the received monitoring result data according to the stored estimation rule And digital protection control comprising: means for editing and means for editing the estimation rule The stem is.

  According to the fourth aspect of the present invention, in the failure site estimation method in the failure site estimation apparatus having the estimation rule storage means for storing the monitoring result data indicating the monitoring result and the estimation rule indicating the causal relationship between the failure site, Receives monitoring result data based on the monitoring data sent via the network, estimates the failure part to be monitored according to the stored estimation rule from the received monitoring result data, and edits the estimation rule A fault location estimation method characterized by the above.

  ADVANTAGE OF THE INVENTION According to this invention, the digital protection control system which can update easily the estimation rule which shows the causal relationship of a failure site | part and a monitoring failure detection item, without stopping operation | movement can be provided.

  A digital protection control system according to an embodiment of the present invention will be described below with reference to the drawings.

<First Embodiment>
FIG. 1 is a diagram showing a digital protection control system according to a first embodiment of the present invention. The same parts as those in FIG.

  As shown in FIG. 1, the digital protection control device 1 is connected to a terminal device 30 via a communication network 20.

  The digital protection control device 1 is, for example, a protection relay device or the like, and includes a protection control function unit 2, a monitoring control unit 10, and a communication control unit 3.

  The protection control function unit 2 is a main function that controls protection control of the protection control device, but since it is not directly involved in the present invention, the description thereof is omitted here.

  The monitoring control unit 10 includes a monitoring failure detection unit 11 that detects a monitoring failure based on input monitoring data and a monitoring result storage unit 12 that stores monitoring result data detected by the monitoring failure detection unit 11. Is realized by software processing.

  The communication control unit 3 transmits the monitoring result data stored by the monitoring result storage unit 12 to the terminal device 30 via the communication network 20 such as Ethernet (registered trademark) LAN.

  The terminal device 30 includes a communication control unit 31, a failure part output unit 32, an estimation rule editing unit 33, and a failure part estimation unit 40.

  The communication control unit 31 receives the monitoring result data transmitted from the communication control unit of the digital protection control device 1 and outputs it to the failure part estimation means 41.

  The failure part estimation unit 40 includes failure part estimation means 41 and an estimation rule 42. The failure part estimation means 41 estimates a failure part from the monitoring result data sent from the communication control unit 31 based on the estimation rule stored in the estimation rule 42. This failure site estimation process is realized by software processing.

  The estimation rule 42 stores an estimation rule that indicates the causal relationship between the monitoring result data and the failure part. The failure part output means 32 outputs the failure part estimated by the failure part estimation means 41 to the screen of the terminal device 30 or the like. The estimation rule editing means 33 is for editing an estimation rule stored in the estimation rule on a GUI (Graphical User Interface).

  The operation of the digital protection control system according to the embodiment of the present invention will be described below with reference to the flowchart of FIG.

  First, the monitoring failure detection means 11 periodically collects monitoring data necessary for monitoring the state in the digital protection control device for each monitoring item, and outputs the result (defective / normal) as monitoring result data. (S1). FIG. 2 is a diagram for explaining the monitoring failure detection means 11. In the figure, as examples of monitoring items, an A / D accuracy monitoring unit 11-1, a PT monitoring unit 11-2, a CT monitoring unit 11-3, a differential current monitoring unit 11-4, and a ROM monitoring unit 11-5 are provided. Show. Each of these monitoring units 11-1 to 11-5 outputs monitoring result (defective / normal) data based on each inputted monitoring data.

  The output monitoring result data is stored by the monitoring result storing means 12 (S2). FIG. 3 is a diagram illustrating an example of monitoring result data stored by the monitoring result storing unit. In the present embodiment, among the monitoring result data to be output, the monitoring items (in this embodiment, the A / D accuracy monitoring unit 11-1, the PT monitoring unit 11-2, the CT monitoring unit 11-3, the difference The monitoring result data indicating the occurrence / recovery of the failure of the current monitoring unit 11-4 and the ROM monitoring unit 11-5) is stored with reference to the clock time inside the apparatus.

  The monitoring result data with the storage time is received by the communication control unit 31 of the terminal device 30 from the communication control unit 3 through the communication network 20 (S3) and input to the failure part estimation means 41.

  The failure part estimation means 41 first determines one event (one cause) based on the storage time included in the monitoring result data input from the communication control unit 31. The determination of this one event is based on the fact that, for example, a plurality of monitoring result data (monitoring failure detection items) detected for one event, the output timing of each monitoring failure for one event falls within a certain period. There is a method of determining a defect that has occurred within a certain period of time as a single event from a state in which no defect has occurred, but is not limited thereto.

  Next, the failure part to be monitored is estimated from the monitoring result data indicating the monitoring failure recognized as the same event according to the estimation rule (S4), and the estimated failure part is notified to the failure part output means 32 (S4). S5).

  FIG. 4 is a diagram illustrating an example of the estimation rule.

  As shown in the figure, rules r1, r2, r3, r4, r5, r6,... Relating to monitoring result data (monitoring failure detection items) f1, f2, f3, f4, f5 are shown. In the figure, when f1 occurs, the failure site is estimated as a1 by rule r1, when f2 occurs, the failure site is estimated as a2 by rule r2, and when f3 occurs, rule r3 Thus, the failure site is estimated as a3, and when f1, f2, and f3 occur, the failure site is estimated as a4 according to rule r4.

  For example, “A / D accuracy” as f 1, “PT monitoring” as f 2, “CT monitoring” as f 3 are input to the failure part estimation means 41 as monitoring failure detection items, and “monitoring failure detection within the same event” is detected as rule r 4. If the item is A / D accuracy, PT monitoring, or CT monitoring, if the failure part is defined as “A4 is an A / D converter”, A / D conversion as a failure part is performed in the failure part output means 32. The vessel is notified. The failure part output means 32 displays the notified A / D converter on the screen of the terminal device 30 to indicate the failure part to the operator.

  Next, an estimation rule editing method by the estimation rule editing unit 33 will be described.

  FIG. 5 is a functional block diagram of the estimation rule editing unit 33, and FIG. 6 is a diagram illustrating an example of an estimation rule editing screen.

  As shown in the figure, the estimation rule editing unit 33 includes an estimation rule reading unit 33-1, a screen display / editing unit 33-2, and an estimation rule storage unit 33-3.

  The estimation rule 42 is stored in a file format in a memory such as a hard disk in the terminal device, and the contents of the file are encoded and stored in a format that can be read by the failure site estimation means 41. Generally, it is a list of data (numbers or symbols) depending on the programming language, so it is difficult for a general text editor or the like to decipher the contents of the estimation rule.

  The estimation rule reading unit 33-1 reads the target estimation rule from the estimation rule 42 in accordance with designation from the screen display / editing unit 33-2 (for example, designation of the estimation rule reading button 51 in FIG. 6). The read estimation rule is displayed on the screen of the terminal device by the screen display / editing means 33-2 in a diagram format that allows the estimation rule to be decoded at a glance.

  The screen display / editing unit 33-2 changes (edits) the estimation rule displayed in the diagram format. Then, for example, by specifying the estimation rule storage button 52 of FIG. 6, the estimation rule storage unit 33-3 changes the file content of the estimation rule so that the changed content is reflected.

  As shown in FIG. 6, the estimation rule editing screen displays the estimation rule in a diagram that can be recognized by a user such as an operator at a glance. The relationship between the failure part (a1, a2, a3) and the failure detection item (f1, f2, f3) is displayed graphically. The user can freely operate the estimation rule (r1, r2, r3 on the GUI by operating the mouse). , R4) can be changed. Furthermore, the display character of the failure part can be changed by inputting from a keyboard or the like.

  FIG. 7 is a diagram illustrating an example in which the estimation rule illustrated in FIG. 4 is changed. In the figure, a case where a condition of f4 (for example, differential current monitoring) is added to the rule r4 is shown. As a result, the rule r4 is changed so that “when the monitoring failure detection item in the same event is A / D accuracy, PT monitoring, CT monitoring, and differential current monitoring, the failure part is an A / D converter”. .

  Therefore, in the conventional failure site estimation mechanism, the failure site estimation unit 40 in FIG. 1 is programmed in the digital protection control device, so it is necessary to change the program by taking measures such as stopping the operation of the device. Yes, while it is difficult to change the estimation rule for the device in operation, according to the embodiment of the present invention, the failure estimation unit 42 is moved to a terminal device independent of the device, and further, the estimation rule By adding the editing means 33, the estimation rule can be changed without affecting the operation of the digital protection control device. As a result, a new accurate estimation rule can be reflected as needed, and as a result, the operator's judgment error is eliminated, and the occurrence of a failure again and the prolongation of the failure recovery time can be prevented.

  Also, by providing the failure estimation unit separately from the digital protection control device, it is possible to perform the failure site estimation process many times while changing the estimation rule. As a result, a plurality of failure site estimation processes can be performed again. Since the evaluation result can be reflected in the estimation rule by evaluating, the estimation accuracy of the evaluation result can be further improved.

<Second Embodiment>
Next, a digital protection control system according to a second embodiment of the present invention will be described. The same parts as those in FIG. 1 are denoted by the same reference numerals, and only different parts will be described here.

  FIG. 9 is a diagram showing a digital protection control system according to the second embodiment of the present invention. As shown in the figure, the failure site estimation unit 40 includes a plurality of estimation rules such as an A device estimation rule 42-A, a B device estimation rule 42-B,..., An N device estimation rule 42-N. Is saved.

  The estimation rule selection means 43 selects an estimation rule corresponding to the digital protection control device 1 from the plurality of estimation rules 42A to 42N. As a method of selecting the estimation rule, a method in which an operator appropriately selects from the screen of the terminal device, or data that allows the terminal device 30 to recognize the device type from the digital protection control device 1 via the communication network 20 is used. There is a method of automatically selecting an estimation rule corresponding to data received and recognizing the received device type from the estimation rules 42A to 42N.

  As a method for the operator to select the estimation rule from the screen, for example, when the operator selects the estimation rule reading button 51 on the editing screen as shown in FIG. The estimation rules 42A to 42N are presented and selected by the user, and the selected estimation rule is read by the estimation rule reading means.

  Therefore, according to the embodiment of the present invention, a plurality of estimation rules can be implemented in the failure site estimation unit, and the corresponding estimation rule can be selected according to the target device that performs the failure site estimation. The estimation rule of the shape protection control device can be handled by one terminal device. As a result, it is not necessary to search for a terminal device having a failure site estimation rule or to prepare a number of terminal devices, and it is possible to quickly perform failure site estimation.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  The method described in the embodiment is stored in a recording medium such as a magnetic disk, an optical disk, or a semiconductor memory as a program (software means) that can be executed by a computer (computer), and transmitted by a communication medium. Can also be distributed. The program stored on the medium side includes a setting program that configures in the computer software means (including not only the execution program but also a table and data structure) to be executed by the computer. A computer that implements this apparatus reads a program recorded on a recording medium, constructs software means by a setting program as the case may be, and executes the above-described processing by controlling the operation by this software means. The recording medium referred to in this specification is not limited to the distribution, but includes a storage medium such as a magnetic disk or a semiconductor memory provided in a computer or a device connected via a network.

1 is a diagram showing a digital protection control system according to a first embodiment of the present invention. It is a figure for demonstrating a monitoring failure detection means. It is a figure which shows an example of the monitoring result data preserve | saved by the monitoring result preservation | save means. It is a figure which shows an example of an estimation rule. It is a functional block diagram of an estimation rule edit means. It is a figure which shows an example of the edit screen of an estimation rule. It is a figure which shows the example which changed the estimation rule shown in FIG. It is a flowchart for demonstrating operation | movement of the digital type protection control system which concerns on the 1st Embodiment of this invention. It is a figure which shows the digital form protection control system which concerns on the 2nd Embodiment of this invention. It is a figure which shows the structure of the negotiation site | part estimation apparatus of the conventional digital type protection control apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Digital type protection control apparatus, 2 ... Protection control function part, 3 ... Communication control part, 10 ... Monitoring control part, 11 ... Monitoring failure detection means, 12 ... Monitoring result preservation | save means, 20 ... Communication network, 30 ... Terminal device 31 ... Communication control unit, 32 ... Failure part output means, 33 ... Estimation rule editing means, 40 ... Failure part estimation part, 41 ... Failure part estimation means, 42 ... Estimation rule.

Claims (13)

Means for receiving monitoring result data based on the monitoring data sent via the network;
An estimation rule storage unit that stores monitoring result data indicating a monitoring result and an estimation rule indicating a causal relationship between a failure part to be monitored;
Means for estimating a failure site to be monitored according to the stored estimation rule from the received monitoring result data;
A failure site estimation apparatus comprising: means for editing the estimation rule.   The fault location estimation apparatus according to claim 1, wherein the monitoring result data is defined for each monitoring item.   The failure part estimation apparatus according to claim 1, wherein the monitoring result data further has a storage time.   The failure part estimation apparatus according to claim 1, wherein the estimation rule is edited on a GUI (Graphical User Interface).   The fault location estimation apparatus according to claim 2, wherein the monitoring items include at least one of A / D accuracy monitoring, PT monitoring, CT monitoring, differential current monitoring, and ROM monitoring of a monitoring target. The estimation rule storage means has a plurality of types of estimation rules,
The failure part estimation apparatus according to claim 1, wherein the estimation unit estimates a failure part using a designated estimation rule.   7. The failure part estimation apparatus according to claim 6, wherein the specification of the estimation rule is based on identification information of a digital protection control apparatus sent via the network or a specification from a user. A digital protection control device that transmits monitoring result data obtained from monitoring data from a monitoring target to a network, and a failure site estimation device that estimates a monitoring target failure site from the monitoring result data from the digital protection control device. In the digital protection control system provided,
The failure site estimation device is:
Means for receiving monitoring result data based on monitoring data sent via the network;
An estimation rule storage unit that stores monitoring result data indicating a monitoring result and an estimation rule indicating a causal relationship between a failure part to be monitored;
Means for estimating a failure site to be monitored according to the stored estimation rule from the received monitoring result data;
Means for editing the estimation rule, and a digital protection control system.   9. The digital protection control system according to claim 8, wherein the monitoring result data is defined for each monitoring item.   9. The digital protection control system according to claim 8, wherein the monitoring result data has a storage time.   9. The digital protection control system according to claim 8, wherein the estimation rule is edited on a GUI (Graphical User Interface). The estimation rule storage means has a plurality of types of estimation rules,
9. The digital type protection control system according to claim 8, wherein the estimating means estimates a fault site using a designated estimation rule. In the failure site estimation method in the failure site estimation apparatus having the estimation rule storage means for storing the estimation result indicating the causal relationship between the monitoring result data indicating the monitoring result and the failure site to be monitored,
Receive monitoring result data based on monitoring data sent over the network,
According to the stored estimation rule from the received monitoring result data, to estimate the failure site to be monitored,
A failure site estimation method, wherein the estimation rule is edited.

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