CN117013484A - Online checking method for relay protection of power grid system - Google Patents

Online checking method for relay protection of power grid system Download PDF

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Publication number
CN117013484A
CN117013484A CN202310735408.2A CN202310735408A CN117013484A CN 117013484 A CN117013484 A CN 117013484A CN 202310735408 A CN202310735408 A CN 202310735408A CN 117013484 A CN117013484 A CN 117013484A
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CN
China
Prior art keywords
relay protection
time
power grid
checking
manual
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CN202310735408.2A
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Chinese (zh)
Inventor
韩雪姣
耿宁
李飞
岳增伟
杨静
高旭
王正男
刘骐
刘林
乔恒
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Zibo Power Supply Co of State Grid Shandong Electric Power Co Ltd
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Zibo Power Supply Co of State Grid Shandong Electric Power Co Ltd
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Application filed by Zibo Power Supply Co of State Grid Shandong Electric Power Co Ltd filed Critical Zibo Power Supply Co of State Grid Shandong Electric Power Co Ltd
Priority to CN202310735408.2A priority Critical patent/CN117013484A/en
Publication of CN117013484A publication Critical patent/CN117013484A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/006—Calibration or setting of parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation

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  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses an online checking method for relay protection of a power grid system, which relates to the technical field of relay protection, and comprises the following operation steps: s1: acquiring real-time data; s2: calculating and monitoring faults; s3: automatically checking; s4: manually checking the request; s5: manually checking; s6: and checking the record. According to the method, fault calculation is carried out on the acquired real-time data of the power grid system, and a manual check request can be sent after automatic check triggering relay protection, so that relay protection staff check the automatic check result again, the improved check method combines the advantages of automatic check and manual check, subjective activity is improved, sensitivity and reliability of relay protection are balanced more effectively, the method can be suitable for power grid systems with increasingly complex data content, and influence is caused by relay protection operation of the power grid system.

Description

Online checking method for relay protection of power grid system
Technical Field
The invention relates to the technical field of relay protection, in particular to an online checking method for relay protection of a power grid system.
Background
The power system is an electric energy production and consumption system which is composed of links such as a power plant, a power transmission and transformation circuit, a power supply and distribution station, electricity consumption and the like; the whole of the power substation and the power transmission and distribution line of various voltages in the power system is called a power grid system, and the main functions of the power grid system are to transmit and distribute electric energy and change the voltage.
The relay protection of the power grid system is an important measure for detecting faults or abnormal conditions in the power grid system so as to send out alarm signals or directly isolate and cut off fault parts; in order to ensure the normal operation of the power grid system relay protection, the relay protection content is usually checked and checked through online checking, the traditional checking is that a distributed relay protection staff performs online real-time checking, and has the advantages of high accuracy, strong manual activity and the like, but the defects are that the checking efficiency is low, so that automatic checking with high checking efficiency gradually replaces manual checking to be mainstream, but the following defects still exist:
although the automatic check has the advantage of high-efficiency processing compared with manual check, the automatic check can be more suitable for a power grid system with increasingly complex data content, but has poorer subjective activity and difficult to balance the sensitivity and reliability of relay protection, thereby affecting the relay protection operation of the power grid system and having more obvious use defects.
Therefore, the invention provides an online checking method for relay protection of a power grid system, which aims at researching and improving the existing structure and defects.
Disclosure of Invention
The invention aims to provide an online checking method for relay protection of a power grid system, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: the online checking method for the relay protection of the power grid system comprises the following operation steps:
s1: and (3) real-time data acquisition:
acquiring power equipment parameters, relay protection fixed values and real-time operation data of the power grid from the power grid through a network element management system and a distributed optical fiber temperature measurement system;
s2: fault calculation and monitoring:
locking the calculation content of the protection setting according to the relay protection setting procedure, providing a relay protection setting calculation formula, then carrying out fault calculation by combining the parameters of the power equipment, the relay protection setting value and the real-time operation data of the power grid, starting a timing module of the power grid system, and monitoring the duration of the fault in real time;
s3: and (3) automatic checking:
the power grid system sends out an automatic check request, and the automatic check judges whether the fault duration reaches a set duration or not by judging the fault duration; if the set time length is not reached, judging that the relay protection is sensitive excessively, refusing the relay protection, and not performing any operation, and if the set time length is reached, triggering a relay protection mechanism, and automatically starting relay protection related operation by a power grid system;
s4: manual check request:
after relay protection triggering, the power grid system continues to send out a manual check request, and whether manual response is overtime is judged first; if the response is overtime, taking the automatic checking result as a manual checking result, and not carrying out other operations, continuing relay protection, and if the response is not overtime, entering manual checking;
s5: and (5) manual checking:
the relay protection staff judges whether the relay protection triggered by automatic checking is reasonable through manual checking, if the manual checking is passed, the relay protection is reasonable, other operations are not needed to be performed through manual intervention, if the manual checking is not passed, the relay protection is unreasonable, the existing relay protection is needed to be controlled through manual intervention, and the relay protection operation is adjusted;
s6: checking and recording:
and (3) carrying out detailed recording on the related content of the protection fixed value check by using a check recording system, integrating and outputting the content in a log form, and sending the content to relay protection staff.
Further, the power grid real-time data in the S1 includes a main network real-time operation data and a secondary network real-time operation data, and the main network real-time operation data and the secondary network real-time operation data are separately acquired, and the acquisition processes are mutually exclusive.
Furthermore, the timing module in S2 uses the fault occurrence time as a monitoring starting point, and continuously and real-timely updates the fault ending time, so as to achieve the purpose of monitoring the fault duration.
Further, the set time length in the step S3 is obtained by analyzing the result of multiple automatic check, and the set time length can be adjusted according to the follow-up automatic check deviation so as to balance the sensitivity and reliability of relay protection automatic check.
Further, in the step S4, the starting point of the timing of the manual response time is the sending time of the manual check request, the end point of the timing is the sending time of the next operation instruction, and the calculation formula of the response time is as follows:
wherein T is the artificial response time length, T ET To time the end time, T ISB To time the starting point time T max Maximum value of artificial response time length, T k Time is sent out for automatic operation.
Furthermore, in the step S4, the relay protection staff must make a response operation within a time specified by the maximum value of the manual response time, otherwise, the response time is defined as a response timeout, and the power grid system will automatically send out a no-operation instruction.
Furthermore, the main basis of the manual checking in the step S5 is the operation experience of the relay protection staff and the relay protection setting procedure of the power grid system, and the manual checking needs two or more relay protection staff to participate together, and the manual checking result is only output by one relay protection staff.
Further, the log content of the protection value check in S6 includes the power equipment parameters, relay protection fixed values, real-time operation data of the power grid, fault content information and duration thereof, automatic check operation content, manual response time length and manual check operation content.
Further, the fault content information comprises a fault element type, a fault position, a fault type and a transition resistance.
The invention provides an online checking method for relay protection of a power grid system, which has the following beneficial effects:
according to the power grid system relay protection online checking method, fault calculation is carried out on acquired power grid system real-time data, the fault duration is monitored in real time, and then whether the fault duration reaches a set duration is judged, so that the phenomenon that transient faults inadvertently trigger relay protection to affect normal use of the power grid system is avoided, the reliability of the power grid system is improved while automatic checking sensitivity is ensured, a manual checking request can be sent after the automatic checking triggers relay protection, a relay protection worker can check the automatic checking result again, when relay protection operation is unreasonable, the relay protection worker can control and adjust the automatic checking result, in addition, manual response timeout judgment is arranged, when the relay protection worker does not timely respond, the automatic checking result is used as a manual checking result, the defect that the automatic checking result is not timely caused by manual checking is reduced, the advantages of automatic checking and manual checking are combined, subjective activity is improved, the sensitivity and reliability of the relay protection are balanced, the relay protection system can be suitable for increasingly complex systems of data content, and the influence caused by operation of the power grid system is reduced, and the existing defects of the power grid system checking method are overcome.
Drawings
FIG. 1 is a schematic diagram of the overall operation flow of an online checking method for relay protection of a power grid system;
FIG. 2 is a schematic diagram of an S2 operation flow of an online checking method for relay protection of a power grid system;
FIG. 3 is a schematic diagram of an operation flow of automatic check request-manual check request of the online check method for power grid system relay protection;
fig. 4 is a schematic diagram of log content of protection fixed value check of the online checking method of power grid system relay protection.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the invention but are not intended to limit the scope of the invention.
As shown in fig. 1 to 4, an online checking method for relay protection of a power grid system includes the following operation steps:
s1: and (3) real-time data acquisition:
acquiring power equipment parameters, relay protection fixed values and real-time operation data of the power grid from the power grid through a network element management system and a distributed optical fiber temperature measurement system;
s2: fault calculation and monitoring:
locking the calculation content of the protection setting according to the relay protection setting procedure, providing a relay protection setting calculation formula, then carrying out fault calculation by combining the parameters of the power equipment, the relay protection setting value and the real-time operation data of the power grid, starting a timing module of the power grid system, and monitoring the duration of the fault in real time;
s3: and (3) automatic checking:
the power grid system sends out an automatic check request, and the automatic check judges whether the fault duration reaches a set duration or not by judging the fault duration; if the set time length is not reached, judging that the relay protection is sensitive excessively, refusing the relay protection, and not performing any operation, and if the set time length is reached, triggering a relay protection mechanism, and automatically starting relay protection related operation by a power grid system;
s4: manual check request:
after relay protection triggering, the power grid system continues to send out a manual check request, and whether manual response is overtime is judged first; if the response is overtime, taking the automatic checking result as a manual checking result, and not carrying out other operations, continuing relay protection, and if the response is not overtime, entering manual checking;
s5: and (5) manual checking:
the relay protection staff judges whether the relay protection triggered by automatic checking is reasonable through manual checking, if the manual checking is passed, the relay protection is reasonable, other operations are not needed to be performed through manual intervention, if the manual checking is not passed, the relay protection is unreasonable, the existing relay protection is needed to be controlled through manual intervention, and the relay protection operation is adjusted;
s6: checking and recording:
and (3) carrying out detailed recording on the related content of the protection fixed value check by using a check recording system, integrating and outputting the content in a log form, and sending the content to relay protection staff.
The power grid real-time data in the S1 comprises main network real-time operation data and secondary network real-time operation data, the main network real-time operation data and the secondary network real-time operation data are acquired separately, and the acquisition processes are not mutually interfered; by acquiring the data separately, the authenticity of the acquired data is improved, and interference to the simultaneous acquisition of the data is avoided.
The timing module in S2 takes the fault occurrence time as a monitoring starting point, continuously and timely updates the fault ending time so as to achieve the purpose of monitoring the fault duration time; the timing module can be used for counting the duration of the fault in real time so as to judge whether the fault is an instantaneous fault or not later, thereby avoiding the error touch relay protection of the instantaneous fault.
S3, the set time length is obtained by analyzing the result of multiple automatic check, and the set time length can be adjusted according to the follow-up automatic check deviation so as to balance the sensitivity and reliability of relay protection automatic check; the set time length is continuously adjusted according to the actual use condition, so that the sensitivity and the reliability of the relay protection automatic check can be balanced.
S4, the starting point of the timing of the artificial response time length is the sending time of the artificial check request, the end point of the timing is the sending time of the next operation instruction, and the calculation formula of the response time length is as follows:
wherein T is the artificial response time length, T ET To time the end time, T ISB To time the starting point time T max Maximum value of artificial response time length, T k Time is sent out for automatic operation.
In S4, the relay protection staff has to respond and operate within the time specified by the maximum value of the manual response time, otherwise, the response time is defined as response time-out, and the power grid system automatically sends out a no-operation instruction; and the interruption of the operation instruction caused by untimely reaction of staff is avoided.
The main basis of the manual checking in S5 is the operation experience of relay protection workers and the relay protection setting procedure of the power grid system, wherein the manual checking needs two or more relay protection workers to participate together, and the manual checking result is output by only one relay protection worker; by the joint participation of two or more workers, the influence of human subjectivity on the checking result is reduced.
The log content of the protection value check in S6 comprises power equipment parameters, relay protection fixed values, real-time operation data of the power grid, fault content information and duration time thereof, automatic check operation content, manual response time and manual check operation content which participate in fault calculation; the fault content information comprises fault element type, fault position, fault type and transition resistance.
In summary, with reference to fig. 1 to 4, the online checking method for relay protection of the power grid system includes the following operation steps:
s1: and (3) real-time data acquisition: acquiring power equipment parameters, relay protection fixed values and real-time operation data of the power grid from the power grid through a network element management system and a distributed optical fiber temperature measurement system; the power grid real-time data comprises main network real-time operation data and secondary network real-time operation data, the main network real-time operation data and the secondary network real-time operation data are acquired separately, and the acquisition processes are not mutually interfered;
s2: fault calculation and monitoring: locking the calculation content of the protection setting according to the relay protection setting procedure, providing a relay protection setting calculation formula, then carrying out fault calculation by combining the parameters of the power equipment, the relay protection setting value and the real-time operation data of the power grid, starting a timing module of the power grid system, and monitoring the duration of the fault in real time; the timing module takes the fault occurrence time as a monitoring starting point, continuously updates the fault ending time in real time so as to achieve the purpose of monitoring the fault duration time;
s3: and (3) automatic checking: the power grid system sends out an automatic check request, and the automatic check judges whether the fault duration reaches a set duration or not by judging the fault duration; if the set time length is not reached, judging that the relay protection is sensitive excessively, refusing the relay protection, and not performing any operation, and if the set time length is reached, triggering a relay protection mechanism, and automatically starting relay protection related operation by a power grid system; the set time length is obtained by analyzing the result of multiple automatic check, and can be adjusted according to the follow-up automatic check deviation so as to balance the sensitivity and reliability of relay protection automatic check;
s4: manual check request: after relay protection triggering, the power grid system continues to send out a manual check request, and whether manual response is overtime is judged first; if the response is overtime, taking the automatic checking result as a manual checking result, and not carrying out other operations, continuing relay protection, and if the response is not overtime, entering manual checking; the timing starting point of the manual response time length is the time when the manual check request is sent, the timing end point is the time when the next operation instruction is sent, and the response time length calculation formula is as follows:
wherein T is the artificial response time length, T ET To time the end time, T ISB To time the starting point time T max Maximum value of artificial response time length, T k Time is sent for automatic operation;
the relay protection staff has to respond and operate within the time specified by the maximum value of the manual response time, otherwise, the response time is defined as the response time-out, and the power grid system automatically sends out a no-operation instruction
S5: and (5) manual checking: the relay protection staff judges whether the relay protection triggered by automatic checking is reasonable through manual checking, if the manual checking is passed, the relay protection is reasonable, other operations are not needed to be performed through manual intervention, if the manual checking is not passed, the relay protection is unreasonable, the existing relay protection is needed to be controlled through manual intervention, and the relay protection operation is adjusted; the manual checking is mainly based on the operation experience of relay protection workers and the relay protection setting procedure of a power grid system, wherein the manual checking needs two or more relay protection workers to participate together, and the manual checking result is output by only one relay protection worker;
s6: checking and recording: the related content of the protection fixed value check is recorded in detail by using a check recording system, and is integrated and output in a log form and is sent to relay protection staff; the log content of the protection fixed value check comprises power equipment parameters participating in fault calculation, relay protection fixed values, real-time operation data of a power grid, fault content information and duration time thereof, automatic check operation content, manual response time length and manual check operation content; the fault content information comprises fault element type, fault position, fault type and transition resistance.
According to the power grid system relay protection online checking method, fault calculation is carried out on acquired power grid system real-time data, the fault duration is monitored in real time, and then whether the fault duration reaches a set duration is judged, so that the phenomenon that transient faults inadvertently trigger relay protection to affect normal use of the power grid system is avoided, the reliability of the power grid system is improved while automatic checking sensitivity is ensured, a manual checking request can be sent after the automatic checking triggers relay protection, a relay protection worker can check the automatic checking result again, when relay protection operation is unreasonable, the relay protection worker can control and adjust the automatic checking result, in addition, manual response timeout judgment is arranged, when the relay protection worker does not timely respond, the automatic checking result is used as a manual checking result, the defect that the automatic checking result is not timely caused by manual checking is reduced, the advantages of automatic checking and manual checking are combined, subjective activity is improved, the sensitivity and reliability of the relay protection are balanced, the relay protection system can be suitable for increasingly complex systems of data content, and the influence caused by operation of the power grid system is reduced, and the existing defects of the power grid system checking method are overcome.
The embodiments of the invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims (9)

1. An online checking method for relay protection of a power grid system is characterized by comprising the following steps of: the online checking method for the relay protection of the power grid system comprises the following operation steps:
s1: and (3) real-time data acquisition:
acquiring power equipment parameters, relay protection fixed values and real-time operation data of the power grid from the power grid through a network element management system and a distributed optical fiber temperature measurement system;
s2: fault calculation and monitoring:
locking the calculation content of the protection setting according to the relay protection setting procedure, providing a relay protection setting calculation formula, then carrying out fault calculation by combining the parameters of the power equipment, the relay protection setting value and the real-time operation data of the power grid, starting a timing module of the power grid system, and monitoring the duration of the fault in real time;
s3: and (3) automatic checking:
the power grid system sends out an automatic check request, and the automatic check judges whether the fault duration reaches a set duration or not by judging the fault duration; if the set time length is not reached, judging that the relay protection is sensitive excessively, refusing the relay protection, and not performing any operation, and if the set time length is reached, triggering a relay protection mechanism, and automatically starting relay protection related operation by a power grid system;
s4: manual check request:
after relay protection triggering, the power grid system continues to send out a manual check request, and whether manual response is overtime is judged first; if the response is overtime, taking the automatic checking result as a manual checking result, and not carrying out other operations, continuing relay protection, and if the response is not overtime, entering manual checking;
s5: and (5) manual checking:
the relay protection staff judges whether the relay protection triggered by automatic checking is reasonable through manual checking, if the manual checking is passed, the relay protection is reasonable, other operations are not needed to be performed through manual intervention, if the manual checking is not passed, the relay protection is unreasonable, the existing relay protection is needed to be controlled through manual intervention, and the relay protection operation is adjusted;
s6: checking and recording:
and (3) carrying out detailed recording on the related content of the protection fixed value check by using a check recording system, integrating and outputting the content in a log form, and sending the content to relay protection staff.
2. The online checking method for relay protection of a power grid system according to claim 1, wherein the power grid real-time data in S1 includes real-time operation data of a main network and real-time operation data of a secondary network, and the real-time operation data of the main network and the real-time operation data of the secondary network are acquired separately, and the acquisition processes are not mutually interfered.
3. The online checking method of power grid system relay protection according to claim 1, wherein the timing module in S2 uses the fault occurrence time as a monitoring starting point, and continuously updates the fault ending time in real time to achieve the purpose of monitoring the fault duration.
4. The online checking method of power grid system relay protection according to claim 1, wherein the set time length in S3 is obtained by analyzing the result of multiple automatic checks, and can be adjusted according to the subsequent automatic check deviation to balance the sensitivity and reliability of the automatic check of relay protection.
5. The online checking method of power grid system relay protection according to claim 1, wherein the starting point of the time of the manual response time in S4 is the time of sending the manual check request, the ending point of the time is the time of sending the next operation instruction, and the calculation formula of the response time is as follows:
wherein T is the artificial response time length, T ET To time the end time, T ISB To time the starting point time T max Maximum value of artificial response time length, T k Time is sent out for automatic operation.
6. The online checking method for power grid system relay protection according to claim 5, wherein in S4, the relay protection staff has to respond within a time specified by the maximum value of the manual response time, otherwise, the response time is defined as a response time-out, and the power grid system will automatically send out no-operation instruction.
7. The method for on-line checking of relay protection of power grid system according to claim 1, wherein the main basis of the manual checking in S5 is the operation experience of relay protection staff and the relay protection setting procedure of power grid system, and two or more relay protection staff are needed to participate in the manual checking, and the manual checking result is output by only one relay protection staff.
8. The method for online checking of power grid system relay protection according to claim 1, wherein the log content of the check of the protection value in S6 includes parameters of the power equipment involved in the fault calculation, relay protection fixed value, and real-time operation data, fault content information and duration time of the power grid, automatic check operation content, manual response duration time, and manual check operation content.
9. The method for online checking of relay protection of power grid system according to claim 9, wherein the fault content information comprises fault element type, fault location, fault type and transition resistance.
CN202310735408.2A 2023-06-20 2023-06-20 Online checking method for relay protection of power grid system Pending CN117013484A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310735408.2A CN117013484A (en) 2023-06-20 2023-06-20 Online checking method for relay protection of power grid system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310735408.2A CN117013484A (en) 2023-06-20 2023-06-20 Online checking method for relay protection of power grid system

Publications (1)

Publication Number Publication Date
CN117013484A true CN117013484A (en) 2023-11-07

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Application Number Title Priority Date Filing Date
CN202310735408.2A Pending CN117013484A (en) 2023-06-20 2023-06-20 Online checking method for relay protection of power grid system

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