JPH1155845A - Digital protective relay device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate identification of the position and the detail of an abnormal condition by the output of a board or a maintenance panel, while diversifying monitoring details in monitoring a device operating condition and occurrence of the abnormal condition. SOLUTION: The information of device operating condition are stored in a nonvolatile memory or a power supply backup memory with codes which indicate state change occurrence time and a state change occurrence section, state information and state change flags, and information analysis data added (S3). The information of abnormality occurrence are stored in the nonvolatile memory or the power supply backup memory with codes which indicate abnormality occurrence time and an abnormality occurrence section, abnormality information and abnormality occurrence flags, abnormality occurrence frequency information, and information analysis data added (S7). The information of the abnormality occurrence substitutes the abnormality information at previous time if a change in the state change flag is within a fixed period, and it is stored as new abnormality information if it exceeds the fixed time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital protection relay device, and more particularly to monitoring information and abnormality information of the operation state of the device (restart due to transient abnormality detection, state change of circuit breaker trip output, etc.). The present invention relates to an information storage method for storing information.

[0002]

2. Description of the Related Art A digital protection relay receives various detection signals as digital information and obtains a protection output such as a trip of a circuit breaker by digital protection calculation. In this apparatus, a self-diagnosis and protection of the apparatus are performed by a monitoring function in order to improve reliability and make free maintenance (simplification of periodic inspection work).

FIG. 4 shows the configuration of a digital protection relay device and its self-monitoring range. The device configuration is such that both the relay unit M serving as the main protection and the relay unit FS serving as the back-up protection take in the voltage V and the current I of the system to be protected by the filters 1 and 2, and this signal is sampled and held by the sample and hold circuits 3 and 4 and the multiplexer 5 , And further converted into a digital signal by the A / D converter 6. A protection operation is performed by the microprocessor 7 based on this information and the contact information and the set value of the protection target range. Obtain protection output such as trip command.

With respect to this device configuration, the monitoring function performs both continuous monitoring and inspection monitoring on analog input data,
It constantly monitors the microprocessor and checks and monitors the input / output and trip circuit.

[0005] These monitoring methods and the number of items tend to increase. Further, a protection function for protecting the device itself when an abnormality is detected by monitoring is provided. For example,
If an abnormality is expected to affect the protection function of the device,
In the case of a transient abnormality, the device may become normal upon restart, and there is a protection function having a restart function in order to prevent the system from becoming unprotected.

[0006] The monitoring result output by the monitoring function as described above is based on information such as which relay unit operated the circuit breaker.
D is displayed by a combination of D and a lamp, or output to a display relay.

[0007]

The digital protection relay device has a complicated self-monitoring function due to diversification of protection contents and diversification of self-monitoring contents. For example, the protection content is classified into two types: abnormalities that affect the protection function are classified into major faults and minor faults that do not affect the self-monitoring. Automatic inspections that are being conducted at the appropriate time are distinguished.

If these diversified contents are displayed by LEDs or the like on a panel or a maintenance panel when an abnormality occurs, it becomes impossible to easily recognize the portion or the contents of the abnormal part.

In view of the above, there is a method of displaying an abnormal portion by increasing the number of LED displays or the like, and a method of coding the content of the error so that the portion can be specified. However, even in such a case, when a plurality of abnormalities occur at the same time, or when the abnormalities are not continued and are automatically recovered, it is difficult to recognize the abnormal part and the contents.

For example, when the apparatus is returned to the normal state by the above-mentioned restart, the apparatus may be in an initialized state, abnormal information may not be left, external output may not be performed, and it may not be noticed in an unmanned substation or the like. .

[0011] Further, in the one having the main protection and the back-up protection,
An indication such as which unit operated the circuit breaker can be obtained, but information cannot be determined and specified when a plurality of trip conditions overlap, such as a simultaneous failure or a ripple failure.

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital protection relay capable of easily identifying complicated and diversified monitoring results.

[0013]

According to the present invention, in order to achieve the above object, a self-monitoring result is added and stored with time information, a special / abnormal code, analysis data, and the like, and further stored in a nonvolatile memory or the like. This makes it possible to easily identify the operation state of the device and occurrence of an abnormality, and has the following configuration.

In the digital protection relay device having a monitoring function for monitoring the operation state of the apparatus and the occurrence of an abnormality, the information on the operation state of the apparatus includes a state change occurrence time, a code indicating a state change occurrence part, state information, and a state change flag. Means for storing in a non-volatile memory or a memory with a power supply backup having state analysis data, and the abnormality occurrence information is a code indicating an abnormality occurrence time, an abnormality occurrence part, abnormality information, an abnormality occurrence flag, and an abnormality occurrence number information. Means for storing the abnormality analysis data in a nonvolatile memory or a memory with a power backup, and the abnormality occurrence information overwrites the previous abnormality information when the change of the state change flag is within a predetermined time, Means for storing as new abnormality information when the predetermined time is exceeded, and storing the stored information on a maintenance panel or a panel. Read, or transmitted to the central and further comprising a means for reading in the center side.

[0015]

FIG. 1 is an information storage flow of an apparatus operation state and abnormality information according to an embodiment of the present invention.

In the storage of the information on the operation state of the device, it is necessary to carry out a process for confirming whether or not there has been a change in the operation state of the device such as a restart or a trip (S1). When there is (S2), the storage process is performed (S3).

This information storage is, as shown in the following example,
The time of occurrence of status change, special code that combines large code divided by monitoring range or item such as watchdog or restart, and individual code divided by method or part, device operation status information, and status change Each item such as analysis data such as the number of detections is provided.

Occurrence time Special code Storage condition Device operation status information {hour} minute} second 800000 Fault occurrence ... hour {minute} second 801000 PSB restart start ... hour {minute} second 802000 error restart start ... {Hour} minute} second 803000 trip …… These information is stored in the non-volatile memory or the memory with power supply backup included in the microprocessor for monitoring or the microprocessor for protection operation, and can be read even when the power is cut off. .

Thus, the stored data can be read out on the maintenance panel or the panel by operating a switch or the like to easily identify the device state, the trip state, and the cause thereof. Further, the stored data can be transmitted to the center using a LAN or a public line, and the operation state can be easily identified on the center side.

The abnormal information is stored in the automatic monitoring process (S4).
When an abnormality has occurred (S5), it is determined whether or not the abnormality is a rising state change indicating whether or not the abnormality has been detected in the immediately preceding monitoring process (S6), and when the abnormality has occurred, abnormality information is stored. (S7).

As shown in FIG. 2, when the state or abnormality processing is detected, the state change flag is changed to "1" at the timing of the rise, as shown in FIG. Is executed when the status change flag is "1".

The storage of the abnormality information stores an abnormality occurrence time, an abnormality code, an abnormality occurrence frequency, analysis data, and the like. When the same abnormality occurs intermittently, as shown in FIG. 2, the storage method is divided into overwrite storage and new storage depending on the period t during which the state change flag changes to “1”.

FIG. 3 shows this storage processing. When storing the abnormality information, it is determined from the number of storages whether or not an abnormality has occurred in the past (S11). If the abnormality has occurred in the past, the period t from the previous time is within a certain time (for example, 24 hours). It is determined from the state change flag whether or not (S12).

If an abnormality occurs within a predetermined time, the number of times of storage of the abnormality is incremented by 1 (S13), and the abnormality information is overwritten and stored using the data pointer of the past storage area (S14).

When an abnormality occurs beyond a certain time, the number of times of storage is set to "1" (S16), the data pointer of the storage area is incremented (S17), and stored as new abnormality information (S15).

The storage of such abnormality information can be used in the same manner as the storage of the operation state of the apparatus, and the location and content of the abnormality and the cause of the abnormality can be easily determined.

[0027]

As described above, according to the present invention, the self-monitoring result is added with the time information, the special / abnormal code, the analysis data, and the like, and is stored in the nonvolatile memory. By reading out the stored information, there is an effect that the operation state of the apparatus and occurrence of an abnormality can be easily identified.

Further, by dividing the information into overwriting and updating depending on the frequency of occurrence of the abnormality, it is possible to accurately determine the cause of the intermittent abnormality while reducing the amount of stored information. Further, by transmitting the stored information to the center, the identification on the center side becomes possible.

[Brief description of the drawings]

FIG. 1 is an information storage flow showing an embodiment of the present invention.

FIG. 2 is an example of detecting a rising state change in the embodiment.

FIG. 3 is a flowchart of a process of storing abnormality information in the embodiment.

FIG. 4 shows a digital protection relay and its automatic monitoring range.

[Explanation of symbols]

 1, 2, filter 3, 4, sample and hold circuit 5, multiplexer 6, A / D converter 7, microprocessor

Claims (1)

[Claims] 1. A digital protection relay device having a monitoring function for monitoring an operation state of an apparatus and occurrence of an abnormality, wherein the information of the operation state of the apparatus is a code indicating a time of occurrence of a state change, a state change occurrence part, state information, and a state. Means for storing a change flag and state analysis data in a non-volatile memory or a memory with a power supply backup, wherein the abnormality occurrence information includes an abnormality occurrence time, a code indicating an abnormality occurrence part, abnormality information, an abnormality occurrence flag, and an abnormality occurrence Means for storing the number of times information and abnormality analysis data in a non-volatile memory or a memory with a power supply backup, and the abnormality occurrence information overwrites the previous abnormality information when the state change flag changes within a predetermined time. Means for storing as the new abnormality information when the predetermined time is exceeded, and a maintenance panel or Read on, or digital protective relay apparatus characterized by comprising by transmitting to the central and means for reading in the center side.