Automatic checking system for constant value of relay protection device of transformer substation

Abstract

The invention relates to the field of relay protection device constant value checking, and provides a transformer substation relay protection device constant value automatic checking system which comprises a constant value data acquisition unit, a constant value automatic checking unit and a report output unit. The constant value data acquisition unit is used for connecting virtual printing equipment with a relay protection device through a serial interface, generating a numerical value document of digital operation by adopting a virtual printer, and transmitting the generated data to the constant value automatic checking unit; an automatic constant value checking unit extracts key data of the actual measured value based on the character string similarity and automatically compares the key data with a reference constant value; the report output unit checks the data and then automatically generates a report and stores the report; the method improves the checking efficiency and accuracy of the constant value of the transformer substation relay protection device, reduces the cost, and is of great significance to the safe and stable operation of a power transmission line.

Description

Technical Field

[0001] The invention relates to the technical field of relay protection device set value data verification, and in particular to a substation relay protection device set value automatic verification system, which extracts set value data through character string similarity and automatically compares it with a reference set value, thereby improving verification efficiency and accuracy. Background Art

[0002] Relay protection refers to a method of isolating or removing the faulty part in time when a transmission line fails or operates abnormally. Setting various protection settings in relay protection equipment is the basis for relay protection to accurately and reliably identify and remove various faults in the power system. The applicability and accuracy of relay protection settings are important guarantees for protecting the safe and reliable operation of transmission lines. Improper settings will cause great harm to the normal operation of the power system. Therefore, after the protection settings are set, it is necessary to check and verify with the reference settings issued by the substation dispatching center to ensure the correctness of the settings.

[0003] At present, the setting work of relay protection devices in substations is still done by manual inspection, that is, the checking personnel print out the reference set values ​​issued by the substation dispatching center, and then check the set values ​​one by one on the protection device to ensure that the set values ​​in the protection device are consistent with the set value sheet results. However, in the face of the increasing number of substations, the increase in protection device equipment, and the changing operation mode of transmission lines, the limited number of set value checkers can no longer meet the large amount of checking work. At the same time, the checking efficiency and accuracy are greatly affected by human subjective factors, which is easy to cause missed detection and false detection.

[0004] Therefore, it is necessary to design a system that can use computer technology to realize the automatic verification of the setting value of the substation relay protection device in response to the above problems, saving human resources while improving the verification efficiency and accuracy. Summary of the invention

[0005] The present invention proposes an automatic checking system for setting values ​​of relay protection devices in substations, aiming to solve the technical problems of large workload, low efficiency, and easy missed detection and false detection in the current manual checking of setting values ​​of relay protection devices in substations.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A substation relay protection device setting automatic checking system, comprising:

[0008] A fixed value data acquisition unit, which uses a virtual printing device to connect to the relay protection device through a serial interface, obtains the actual operating data in the relay protection device, and generates a corresponding txt file. At the same time, it converts the reference fixed value issued by the substation dispatching center into an excel format to facilitate subsequent data verification;

[0009] A fixed value automatic checking unit, which compares the actual measured value in the relay protection device obtained by the fixed value data acquisition unit with the reference fixed value issued by the substation dispatching center, checks whether there is any discrepancy in the data one by one, and generates a report with the test results;

[0010] The report output unit automatically generates a report and saves it in the computer after completing the verification of the relay protection device based on the data output by the set value automatic verification unit. The generated report can be stored in the form of office and excel, which is convenient for verification personnel to save and view.

[0011] Furthermore, the set value automatic checking unit can automatically extract and select reference set values ​​and actual measured values ​​based on the protection set value character string sorting rules to establish a unified hierarchy.

[0012] Furthermore, the unified hierarchy in the set value automatic verification unit includes 4 levels, wherein the first level is the set value single name such as "basic set value", the second level is the sub-set value single name, such as "220kV main transformer fault judgment basic set value", "220kV main transformer switch quantity basic set value" and "220kV unit fault judgment basic set value", the third level is the set value name, such as "main transformer high operation current / power", "main transformer trip judgment HWJ", "main transformer investment judgment HWJ" and "line operation current / power", and the fourth level is the corresponding specific protection set value data, such as "minimum setting value" and "maximum setting value".

[0013] Furthermore, when the set value automatic verification unit performs automatic verification, it is necessary to pair the reference set value with the set value name of the actual value. However, in actual situations, abbreviations and abbreviations may appear in the set value names. For example, in the reference set value list, "main transformer gas protection set value" is simplified to "main transformer gas set value". The present invention measures the similarity between fields through a string similarity method to determine whether there are errors in the set value data.

[0014] Furthermore, the specific steps of the fixed value automatic checking unit using the string similarity method to measure the similarity between fields are as follows:

[0015] S1: The minimum operation required to transform two characters is represented by a Levenshtein distance method that can measure the degree of difference between two characters, including inserting, deleting and replacing characters;

[0016] S2: For domains with different characteristics at the same level, by traversing the correspondence between each domain, the one with the lowest Levenshte in distance is selected as the best match, and its maximum value is set to 2 to prevent mismatching;

[0017] S3: If the match cannot be completed, a suspicious report will be output and the checker will check whether it is correct.

[0018] Furthermore, the verification report generated by the report output unit includes the tested equipment, detection time and results, which can effectively reduce the workload of the verification personnel; at the same time, the verification personnel can easily count and screen the verification results using the relevant functions of office or excel software, greatly improving work efficiency.

[0019] Compared with the existing manual verification and setting technology, the present invention has the following beneficial effects:

[0020] 1. The present invention can greatly improve the efficiency of inspection, reduce the workload of checking personnel, and reduce the consumption of enterprise human resources by using computers for automated inspection.

[0021] 2. The present invention can greatly save paper resources by using a paperless verification method, and at the same time has the advantages of large storage space, easy protection and easy management.

[0022] 3. The present invention realizes the automatic verification of the setting value of the relay protection device through a computer, which can reduce the false detection and missed detection caused by human subjectivity, improve the stability of the power system operation, and has significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a flow chart of the method provided by the present invention;

[0024] Figure 2 It is a hierarchical data structure diagram provided by the present invention;

[0025] Figure 3 It is a functional flow chart of the fixed value automatic checking unit in the present invention. DETAILED DESCRIPTION

[0026] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] The present invention provides a substation relay protection device setting automatic checking system, comprising:

[0028] A fixed value data acquisition unit, which uses a virtual printing device to connect to the relay protection device through a serial interface, obtains the actual operating data in the relay protection device, and generates a corresponding txt file. At the same time, it converts the reference fixed value issued by the substation dispatching center into an excel format to facilitate subsequent data verification;

[0029] A fixed value automatic checking unit, which compares the actual measured value in the relay protection device obtained by the fixed value data acquisition unit with the reference fixed value issued by the substation dispatching center, checks whether there is any discrepancy in the data one by one, and generates a report with the test results;

[0030] The report output unit automatically generates a report and saves it in the computer after completing the verification of the relay protection device based on the data output by the set value automatic verification unit. The generated report can be stored in the form of office and excel, which is convenient for verification personnel to save and view.

[0031] Embodiment 1:

[0032] As attached Figure 1 To Attachment Figure 2 As shown:

[0033] This embodiment provides a fixed value data acquisition unit, which can obtain fixed value data generated during the actual operation of the relay protection device.

[0034] Among them, the fixed value data acquisition unit connects the virtual printer device to the relay protection device through a serial interface, so as to obtain the fixed value data generated during the actual operation of the protection device and generate the corresponding txt format file. At the same time, the reference fixed value data issued by the substation dispatching center is converted into excel format, and the two sets of data are transmitted to the fixed value automatic verification unit.

[0035] Among them, the set value data includes two set values, one is the reference set value issued by the substation dispatching center, and the other is collected from the relay protection device.

[0036] Specifically, the reference setting values ​​issued by the substation dispatching center are generally in xls format. The present invention adopts a virtual printing method to change the data format obtained by the relay protection device to a txt file, so it is necessary to extract key information again from the txt setting value file separately.

[0037] Embodiment 2:

[0038] As attached Figure 3 As shown:

[0039] This embodiment provides a set value automatic checking unit, which can automatically compare the collected set value data of the relay protection device with the reference set value data issued by the substation dispatching center to determine whether there is an error in the set value data.

[0040] Among them, the set value automatic verification unit requires the verification personnel to input the reference set value and the set value actually measured by the protection device into the system through the human-machine interface. The system will automatically extract and select the reference set value and the actual value to establish a unified level.

[0041] Among them, the unified hierarchy in the set value automatic verification unit includes 4 levels, among which the first level is the set value single name such as "basic set value", the second level is the sub-set value single name, such as "220kV main transformer fault judgment basic set value", "220kV main transformer switch quantity basic set value" and "220kV unit fault judgment basic set value", the third level is the set value name, such as "main transformer high operation current / power", "main transformer trip judgment HWJ", "main transformer investment judgment HWJ" and "line operation current / power", and the fourth level is the corresponding specific protection set value data, such as "minimum setting value" and "maximum setting value".

[0042] Among them, the automatic verification unit of the fixed value needs to first match the name of the reference fixed value with the name of the actual fixed value. However, in actual operation, the fixed value name may have abbreviations and abbreviations. Therefore, this embodiment proposes a method to measure the similarity between fields based on the string similarity method to determine whether the fixed value name has abbreviations or abbreviations. At the same time, for domains with different characteristics at the same level, by traversing the corresponding relationship between each domain, the one with the lowest Levenshtein distance is selected as the optimal match, and its maximum value is set to 2 to prevent mismatching. If the match is unsuccessful, the system will automatically output a report result, and the verification personnel will judge the operation by themselves.

[0043] Among them, the string similarity method uses the Levenshtein distance to represent the minimum operation required for the transformation between two strings.

[0044] Among them, Levenshtein distance is a measurement method used to measure the degree of difference between two strings. It is defined as the minimum number of editing operations required to convert one string into another string. Editing operations include insertion, deletion, and replacement.

[0045] In order to further verify the effectiveness of the automatic setting value verification unit proposed in this embodiment, a manual setting value verification control group was set up to count and analyze the setting value verification time and accuracy. Using the common RCS901, RCS92, PCS932N and CS-104A protection devices in the power system, the comparison results of the setting value verification time are shown in the following table.

[0046] Protective devices Check quantity Automatic time check Manual verification time RCS901 78 2.5 8.25 RCS92 99 2.25 10.5 PCS932N 121 2 12 CS-104A 213 2.15 24

[0047] By comparing the time spent on automatic verification and manual verification of various protection device settings, it is found that the automatic verification time does not exceed 3 minutes, while the maximum manual verification time is 24 minutes. In addition, as the number of verification items increases, the time used for automatic verification does not change significantly. Conventional manual verification of fixed values ​​requires two people to check together to reduce the error rate. As the number of verifications increases, the time used naturally increases, and factors such as brain and physical fatigue during long-term verification will reduce work efficiency and increase verification time. During the automatic verification process, the verifier only needs to review the suspicious items in the report, which greatly reduces the workload, so the same work can be completed by only one person. It can be seen that the use of automated verification methods can effectively save labor and time.

[0048] The accuracy comparison results of the fixed value verification are shown in the following table.

[0049]

[0050]

[0051] As can be seen from the table, as the number of verification items increases, the number of manual verification errors increases nonlinearly, and in order to reduce the verification time, two people are required to verify. This is mainly because long-term verification causes fatigue among the verification personnel, which causes the number of errors to increase nonlinearly. The number of verification errors of the automatic verification system is basically kept within 5, which is mainly caused by the recognition error of the fixed value name string.

[0052] Compared with the existing manual verification technology, this embodiment solves the problems of low efficiency, large human resource occupation, missed detection and false detection in the existing technology. At the same time, the fixed value sheet is archived and managed through computer digital technology, saving paper resources. It has the advantages of large storage space, easy protection and easy management, which improves the efficiency and accuracy of fixed value data verification and can produce significant economic and social benefits.

[0053] Working principle: The computer's ability to quickly process data replaces the manual work of checking the set values ​​one by one. The computer is used to automatically obtain the set value data of the relay protection device, and then the Levenshte in distance is used to represent the minimum operation required for the transformation between two characters. The similarity method is used to measure the similarity between fields to determine whether the set value data is incorrect. Finally, the report information with the tested equipment, detection time and results is output so that the checker can count and screen the results, greatly improving work efficiency.

[0054] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A substation relay protection device setting automatic verification system, characterized in that: include: The fixed value data acquisition unit is connected to the relay protection device through a serial interface using a virtual printing device to obtain the actual operating data in the relay protection device and generate a corresponding txt file. At the same time, the reference fixed value issued by the substation dispatching center is converted into an excel format to facilitate subsequent data verification; A fixed value automatic checking unit, which compares the actual measured value in the relay protection device obtained by the fixed value data acquisition unit with the reference fixed value issued by the substation dispatching center, checks whether there is any discrepancy in the data one by one, and generates a report with the test results; The report output unit automatically generates a report and saves it in a computer after completing the verification of the relay protection device based on the data output by the set value automatic verification unit. The generated report can be stored in office and excel formats, which is convenient for verification personnel to save and view.

2. The automatic checking system for setting values ​​of relay protection devices in substations according to claim 1, characterized in that: The set value automatic checking unit can automatically extract and select reference set values ​​and actual measured values ​​based on the protection set value character string sorting rules to establish a unified hierarchy.

3. The automatic checking system for setting values ​​of relay protection devices in substations according to claim 2, characterized in that: The unified hierarchy includes four levels, wherein the first level is the name of the setting value such as "basic setting value", the second level is the sub-setting value name, the third level is the setting value name, and the fourth level is the corresponding specific protection setting value data.

4. The automatic checking system for setting values ​​of relay protection devices in substations according to claim 2, characterized in that: When the fixed value automatic verification unit performs automatic verification, it first pairs the fixed value names. According to the abbreviations and abbreviations of the fixed value names in actual situations, the similarity between the fields is measured by the string similarity method to determine whether there are errors in the fixed value data.

5. The automatic checking system for setting values ​​of relay protection devices in substations according to claim 4, characterized in that: The string similarity method is the Levenshtein distance method, and its specific implementation process is as follows: S1: The minimum operations required to transform two characters are represented by a Levenshtein distance method that can measure the degree of difference between two characters, including inserting, deleting and replacing characters; S2: For domains with different characteristics at the same level, by traversing the correspondence between each domain, the one with the lowest Levenshtein distance is selected as the best match, and its maximum value is set to 2 to prevent mismatching; S3: If the match cannot be completed, a suspicious report will be output and the checker will check whether it is correct.

6. The automatic checking system for setting values ​​of relay protection devices in substations according to claim 1, characterized in that: The verification report generated by the report output unit includes the tested equipment, the detection time and the result, which can effectively reduce the workload of the verification personnel.

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