CN117074932A - Relay protection online monitoring method - Google Patents
Relay protection online monitoring method Download PDFInfo
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- CN117074932A CN117074932A CN202310863766.1A CN202310863766A CN117074932A CN 117074932 A CN117074932 A CN 117074932A CN 202310863766 A CN202310863766 A CN 202310863766A CN 117074932 A CN117074932 A CN 117074932A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 34
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- 230000002159 abnormal effect Effects 0.000 claims abstract description 20
- 238000011156 evaluation Methods 0.000 claims description 45
- 238000012545 processing Methods 0.000 claims description 11
- 238000012163 sequencing technique Methods 0.000 claims description 7
- 238000012806 monitoring device Methods 0.000 claims description 4
- 238000009877 rendering Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 6
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- 238000006243 chemical reaction Methods 0.000 description 5
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- 238000012986 modification Methods 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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Abstract
The invention relates to the technical field of power systems, in particular to an online relay protection monitoring method, which comprises the following steps: acquiring action message data and running state data of relay protection equipment; the action message data and the running state data are sent to monitoring equipment; the monitoring equipment performs difference analysis on the received action message data and the running state data based on a preset monitoring model to obtain a protection action state of the relay protection equipment; judging whether the relay protection equipment is abnormal or not according to the protection action state; if the analysis result of the relay protection equipment is normal, continuing to work the data acquisition; if the analysis result of the relay protection equipment is abnormal, generating warning information; and sending a warning notice to the monitoring equipment according to the warning information. The invention has high monitoring efficiency, saves labor resources, can discover the faults of relay protection equipment in time, and is convenient for maintenance.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to an online relay protection monitoring method.
Background
Relay protection is an important measure for detecting faults or abnormal conditions in a power system, sending out alarm signals or directly isolating and cutting off fault parts. The relay protection on-line monitoring system is important equipment for guaranteeing safe operation of the power system, and is not refused to operate or malfunction aiming at any type of faults, and sensitivity and rapidness are required. In practical application, when an electrical element in the power system fails or runs abnormally, the relay protection device can control the circuit breaker to trip, so that the safe running of other electrical elements is ensured, and whether the relay protection device can work normally or not is directly related to whether the whole power system can run normally or not.
In the operation of a traditional transformer substation, maintenance personnel are usually required to use some testing tools to monitor a protection loop of a relay protection device in the traditional transformer substation, so that the protection loop can be processed in time when the protection loop is abnormal, and the safe operation of the traditional transformer substation is ensured. The monitoring management of the existing relay protection device on-line monitoring system basically relies on manual inspection or a special tool provided by a relay protection device on-line monitoring system manufacturer to monitor.
Therefore, the online monitoring method of the relay protection device has low efficiency, can not be found in time when the device fails, and is difficult to repair and maintain. Therefore, the existing requirements are not met, and an online relay protection monitoring method is provided.
Disclosure of Invention
The invention provides a relay protection online monitoring method, which aims to solve the technical problems that the efficiency of the relay protection online monitoring system is low, the device cannot be found in time when in fault and the maintenance is difficult because the monitoring management of the existing relay protection online monitoring system basically depends on manual inspection or a special tool provided by a manufacturer of the relay protection online monitoring system.
In a first aspect, the present invention provides an online monitoring method for relay protection, including:
acquiring action message data and running state data of relay protection equipment;
the action message data and the running state data are sent to monitoring equipment;
the monitoring equipment performs difference analysis on the received action message data and the running state data based on a preset monitoring model to obtain a protection action state of the relay protection equipment;
judging whether the relay protection equipment is abnormal or not according to the protection action state;
if the analysis result of the relay protection equipment is normal, continuing to work the data acquisition; if the analysis result of the relay protection equipment is abnormal, generating warning information;
and sending a warning notice to the monitoring equipment according to the warning information.
In an optional implementation manner, the action message data of the relay protection device comprises protection action information, state shift information and intermediate node information; the operation state data of the relay protection equipment comprise temperature data, humidity data, voltage data and current data.
In an optional implementation manner, the obtaining the action message data and the running state data of the relay protection device includes:
and based on the preset acquisition time, acquiring action message data and running state data of the relay protection equipment at regular time. The operation can automatically acquire the message format type of the action message without manual identification and setting. This simplifies the operation flow and improves the work efficiency. The specific message format type adopted by the action message can be known through the acquired information, and an accurate basis is provided for subsequent data processing and conversion.
And setting transcoding equipment, and performing transcoding processing on the acquired action message data and running state data of the relay protection equipment to obtain a unified data format.
In an optional implementation manner, the transcoding the obtained action message data and the running state data of the relay protection device to obtain the unified data format includes:
obtaining the message format type of the action message data;
extracting data quantity matched with the message format type, and sequencing the message format type from high to low according to the data quantity to obtain message data information;
obtaining candidate message formats based on preset candidate message format screening rules;
acquiring message data information based on a preset first time threshold, and performing evaluation parameter calculation on the candidate message formats according to the message data information to obtain evaluation parameter values matched with the candidate message formats;
sequencing the evaluation parameter values from high to low to obtain the maximum evaluation parameter value;
selecting a candidate format with the maximum evaluation parameter value to obtain a target message format;
and converting the action message data according to the target message format to generate message data with the same format as the target message format.
In an alternative embodiment, the evaluation parameter is calculated as:
wherein V represents an evaluation parameter value matched with the candidate message format; c represents the amount of data that matches the candidate message format; c represents the total data volume of the action message; c i represents the amount of data generated corresponding to the ith unit time that matches each candidate message format; v0 represents a preset parameter reference value.
Through the operation steps, the real-time monitoring, threshold judgment, monitoring duration setting and replacement judgment of the candidate message formats are realized, so that the marking and replacement of the message formats with the performance not meeting the requirements are realized, and the performance and the stability of the system are improved.
In an alternative embodiment, the candidate message format includes:
judging whether to replace the candidate message format or not through the evaluation parameter value matched with the candidate message format in the first time threshold;
and when the candidate message format is within the corresponding monitoring duration, the evaluation parameter value is smaller than the accumulated duration of the preset parameter threshold value and is lower than the preset proportion, replacing the candidate message format.
In an alternative embodiment, the replacement candidate message format includes:
detecting the evaluation parameter values matched with the candidate message formats in real time;
if the evaluation parameter value is smaller than a preset parameter threshold, marking the candidate message format of which the evaluation parameter value is smaller than the preset parameter threshold to obtain a marked candidate message format;
and setting monitoring duration and preset proportion for the mark candidate message format.
In an alternative embodiment, the monitoring duration is:
the preset proportion is as follows:
wherein T is the monitoring duration; p is a preset proportion; td is a first time threshold; vy is a parameter threshold; vm is the maximum evaluation parameter value; p0 is a proportional reference value.
In an alternative embodiment, the monitoring device comprises:
and converting the acquired action message data and running state data of the relay protection equipment into a graphic data structure, and rendering the graphic data structure to enable the running state data to be displayed on a display of the monitoring equipment.
In an alternative embodiment, the warning message includes:
judging the type of the warning information according to the warning information;
and sending out a corresponding warning notice according to the type of the warning information, and displaying the warning notice on a display of the monitoring equipment.
The on-line monitoring method for the relay protection has the advantages that the action message data and the running state data of the relay protection equipment are obtained, the action message data and the running state data are transmitted to the data monitoring equipment through a remote mode, the data monitoring equipment performs visual processing on the running state data through visual display, the running state data are comprehensively displayed on a display, the data monitoring equipment analyzes and judges whether the relay protection equipment is abnormal or not through the analysis of the action message data, if the judging result of the relay protection equipment is abnormal, warning information is generated and sent to a warning, the type of the warning information is confirmed by the warning, and then corresponding warning notification is sent according to the confirmed type of the warning information, the warning notification is displayed on the display and can be sent to an maintainer remotely to remind the monitored personnel and the maintainer of the monitoring equipment.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic block diagram of a method of one embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The relay protection online monitoring method provided by the embodiment of the invention is executed by the computer equipment, and correspondingly, the relay protection online monitoring method is operated in the computer equipment.
FIG. 1 is a schematic flow chart of a method of one embodiment of the invention. The execution body of fig. 1 may be a relay protection online monitoring method. The order of the steps in the flow chart may be changed and some may be omitted according to different needs.
As shown in fig. 1, the method includes:
step 110, obtaining action message data and running state data of relay protection equipment;
step 120, the action message data and the running state data are sent to a monitoring device;
step 130, the monitoring equipment performs difference analysis on the received action message data and the running state data based on a preset monitoring model to obtain a protection action state of the relay protection equipment;
step 140, judging whether the relay protection equipment is abnormal or not according to the protection action state;
step 150, if the analysis result of the relay protection equipment is normal, continuing to work the data acquisition; if the analysis result of the relay protection equipment is abnormal, generating warning information
And step 160, sending a warning notice to the monitoring equipment according to the warning information.
In order to facilitate understanding of the present invention, the principle of the relay protection online monitoring method of the present invention is used to further describe the relay protection online monitoring method provided by the present invention in combination with the process of monitoring relay protection in the embodiment.
Specifically, the relay protection online monitoring method comprises the following steps:
s1, acquiring action message data and running state data of relay protection equipment.
The action message data of the relay protection equipment comprises protection action information, state shift information and intermediate node information; the operation state data of the relay protection equipment comprise temperature data, humidity data, voltage data and current data.
The step of obtaining the action message data and the running state data of the relay protection equipment comprises the following steps:
acquiring action message data and running state data of relay protection equipment at regular time based on preset acquisition time;
and setting transcoding equipment, and performing transcoding processing on the acquired action message data and running state data of the relay protection equipment to obtain a unified data format.
The transcoding the obtained action message data and running state data of the relay protection equipment to obtain a unified data format comprises the following steps:
obtaining the message format type of the action message data;
extracting data quantity matched with the message format type, and sequencing the message format type from high to low according to the data quantity to obtain message data information;
obtaining candidate message formats based on preset candidate message format screening rules;
acquiring message data information based on a preset first time threshold, and performing evaluation parameter calculation on the candidate message formats according to the message data information to obtain evaluation parameter values matched with the candidate message formats;
sequencing the evaluation parameter values from high to low to obtain the maximum evaluation parameter value;
selecting a candidate format with the maximum evaluation parameter value to obtain a target message format;
and converting the action message data according to the target message format to generate message data with the same format as the target message format.
The evaluation parameters were calculated as:
wherein V represents an evaluation parameter value matched with the candidate message format; c represents the amount of data that matches the candidate message format; c represents the total data volume of the action message; c i represents the amount of data generated corresponding to the ith unit time that matches each candidate message format; v0 represents a preset parameter reference value.
The candidate message format includes:
judging whether to replace the candidate message format or not through the evaluation parameter value matched with the candidate message format in the first time threshold;
and when the candidate message format is within the corresponding monitoring duration, the evaluation parameter value is smaller than the accumulated duration of the preset parameter threshold value and is lower than the preset proportion, replacing the candidate message format.
The replacement candidate message format includes:
detecting the evaluation parameter values matched with the candidate message formats in real time;
if the evaluation parameter value is smaller than a preset parameter threshold, marking the candidate message format of which the evaluation parameter value is smaller than the preset parameter threshold to obtain a marked candidate message format;
and setting monitoring duration and preset proportion for the mark candidate message format.
The monitoring duration is as follows:
the preset proportion is as follows:
wherein T is the monitoring duration; p is a preset proportion; td is a first time threshold; vy is a parameter threshold; vm is the maximum evaluation parameter value; p0 is a proportion reference value, and the value range of P0 is 60% -70%.
Specifically, the acquisition time can be preset, the action message data and the running state data of the relay protection device are acquired at regular time according to the preset acquisition time, the timeliness of the acquired data is guaranteed, workers can monitor the relay protection device in real time, the acquired action message data and running state data are transcoded through data processing, the action message data and the running state data are unified into one format, the situation that communication protocols and interfaces are various and access is difficult due to the fact that the action message data and the running state data are not unified is avoided, and the format is identical through data processing conversion, so that the network communication unit is convenient to transmit.
And the message format type of the action message can be automatically acquired without manual identification and setting. This simplifies the operation flow and improves the work efficiency. The specific message format type adopted by the action message can be known through the acquired information, and an accurate basis is provided for subsequent data processing and conversion. The data amount extraction module can extract the data amount corresponding to each message format type and sort the data amount according to the sequence from high to low. Thus, the data size of different message format types can be quickly identified and distinguished. Through the sorting, the message format type with the highest data volume can be conveniently determined, and a foundation is provided for the subsequent message format selection and evaluation. According to the three message format types with the highest data volume, the types are selected as candidate message formats. Therefore, limited candidate message format evaluation can be concentrated, and the processing efficiency is improved. And the evaluation parameter value corresponding to each candidate message format can be calculated according to the message data information in the first batch of sequenced unit time. This provides automated evaluation parameter calculation, reducing the likelihood of human intervention and error. Through the obtained evaluation parameter values, the different candidate message formats can be compared and evaluated to select the most suitable message format. And generating message data consistent with the target message format by performing data conversion on the action message according to the target message format. This helps achieve data compatibility and interactivity between different message formats. The candidate message format replacement judging module can determine whether to replace the candidate message format through the evaluation parameter value corresponding to the candidate message format in each unit time. This provides automated message format selection and replacement decisions, reducing the subjectivity and the likelihood of errors of manual decisions.
The method and the device realize the acquisition of the message format types, the extraction and the sequencing of the data quantity, the selection and the evaluation of the candidate message formats, the conversion of the message data and the replacement judgment of the candidate message formats, thereby improving the efficiency and the accuracy of message processing.
S2, the action message data and the running state data are sent to monitoring equipment.
The monitoring device includes:
and converting the acquired action message data and running state data of the relay protection equipment into a graphic data structure, and rendering the graphic data structure to enable the running state data to be displayed on a display of the monitoring equipment.
Specifically, the operation state data is converted into a graphic data structure according to the obtained operation state data, so that the graphic data is obtained, the graphic data is rendered into visual picture information, the rendered visual picture information is displayed in an all-around mode through a display of the monitoring equipment, and the design is used for better displaying the operation state of the relay protection equipment, so that a worker can more intuitively check and monitor the operation state of the relay protection equipment.
And S3, the monitoring equipment performs difference analysis on the received action message data and the running state data based on a preset monitoring model to obtain the protection action state of the relay protection equipment.
And S4, judging whether the relay protection equipment is abnormal or not according to the protection action state.
S5, if the analysis result of the relay protection equipment is normal, continuing to work data acquisition; and if the analysis result of the relay protection equipment is abnormal, generating warning information.
Specifically, firstly, a monitoring model related to the relay protection equipment is established in advance, collected action message data is input into a preset monitoring model, the collected action message data and the monitoring model are subjected to comparative analysis, the difference between the action message data and the monitoring model is analyzed, the protection action state of the relay protection equipment is determined according to the difference between the action message data and the monitoring model, whether the relay protection equipment is abnormal or not is judged according to the analysis of the protection action state, if the judgment result of the relay protection equipment is normal, the action message data and the running state data are continuously obtained, the monitoring platform continuously monitors the relay protection equipment according to the collected data, and if the judgment result of the relay protection equipment is abnormal, warning information is generated and warning is sent.
And S6, sending a warning notice to the monitoring equipment according to the warning information.
The warning information comprises:
judging the type of the warning information according to the warning information;
and sending out a corresponding warning notice according to the type of the warning information, and displaying the warning notice on a display of the monitoring equipment.
Specifically, firstly, the warning information sent by the monitoring equipment is confirmed, which type of the protection action information, the state shift information and the intermediate node information is further confirmed, after the type of the warning information is confirmed, the warning notification is sent out according to the confirmed type of the warning information, the warning notification is displayed on a display of the monitoring equipment and used for reminding a monitored staff to pay attention, meanwhile, the warning notification can also be remotely sent to an maintainer and used for reminding the maintainer to pay attention to maintenance, the corresponding warning notification is sent out according to an abnormal type, the maintainer and the maintainer can more intuitively know the reason of the fault of the relay protection equipment, meanwhile, the maintainer can conveniently and rapidly find out the reason of the fault, the maintainer can timely find the fault, and the maintenance difficulty is reduced.
Therefore, the timeliness of the collected data is ensured by carrying out timing collection on the action message data and the running state data of the relay protection equipment; the transcoding processing is carried out on the collected action message data and the running state data, so that the unification of the formats of the action message data and the running state data is ensured, and the network communication unit is convenient to transmit; the monitoring equipment performs visual display on the operation state data, firstly converts the operation state data into graphic data, renders the graphic data to obtain visual picture information, performs full-scale display on the visual picture information through the monitoring equipment, performs analysis and judgment on the action message data, inputs the collected action message data into a preset monitoring model through the preset monitoring model, performs comparison analysis on the difference between the action message data and the action message data to determine the protection action state of the relay protection equipment, analyzes and judges whether the relay protection equipment is abnormal according to the protection action state, generates corresponding warning information according to an abnormal item when the judging result of the relay protection equipment is abnormal, further confirms the type of the warning information, sends warning notification according to the confirmed type of the warning information to the monitoring equipment and an maintainer, is convenient for the maintainer to more intuitively know the reason of the fault of the relay protection equipment, and meanwhile is convenient for the maintainer to quickly find the fault reason, so that the maintainer can find the fault timely, and the maintenance difficulty is reduced. The technical effects achieved by this embodiment may be referred to above, and will not be described herein.
It will be apparent to those skilled in the art that the techniques of embodiments of the present invention may be implemented in software plus a necessary general purpose hardware platform. Based on such understanding, the technical solution in the embodiments of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium such as a U-disc, a mobile hard disc, a Read-only Memory (ROM), a random access Memory (RAM, random Ac ce s s Memory), a magnetic disk or an optical disk, etc. various media capable of storing program codes, including several instructions for causing a computer terminal (which may be a personal computer, a server, or a second terminal, a network terminal, etc.) to execute all or part of the steps of the method described in the embodiments of the present invention.
The same or similar parts between the various embodiments in this specification are referred to each other. In particular, for the terminal embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and reference should be made to the description in the method embodiment for relevant points.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The relay protection online monitoring method is characterized by comprising the following steps of:
acquiring action message data and running state data of relay protection equipment;
the action message data and the running state data are sent to monitoring equipment;
the monitoring equipment performs difference analysis on the received action message data and the running state data based on a preset monitoring model to obtain a protection action state of the relay protection equipment;
judging whether the relay protection equipment is abnormal or not according to the protection action state;
if the analysis result of the relay protection equipment is normal, continuing to work the data acquisition; if the analysis result of the relay protection equipment is abnormal, generating warning information;
and sending a warning notice to the monitoring equipment according to the warning information.
2. The method of claim 1, wherein the action message data of the relay protection device includes protection action information, state shift information, and intermediate node information; the operation state data of the relay protection equipment comprise temperature data, humidity data, voltage data and current data.
3. The method of claim 1, wherein the obtaining the action message data and the operation state data of the relay protection device comprises:
acquiring action message data and running state data of relay protection equipment at regular time based on preset acquisition time;
and setting transcoding equipment, and performing transcoding processing on the acquired action message data and running state data of the relay protection equipment to obtain a unified data format.
4. The method of claim 3, wherein transcoding the acquired action message data and running state data of the relay protection device to obtain a unified data format comprises:
obtaining the message format type of the action message data;
extracting data quantity matched with the message format type, and sequencing the message format type from high to low according to the data quantity to obtain message data information;
obtaining candidate message formats based on preset candidate message format screening rules;
acquiring message data information based on a preset first time threshold, and performing evaluation parameter calculation on the candidate message formats according to the message data information to obtain evaluation parameter values matched with the candidate message formats;
sequencing the evaluation parameter values from high to low to obtain the maximum evaluation parameter value;
selecting a candidate format with the maximum evaluation parameter value to obtain a target message format;
and converting the action message data according to the target message format to generate message data with the same format as the target message format.
5. The method of claim 4, wherein the evaluation parameter is calculated as:
wherein V represents an evaluation parameter value matched with the candidate message format; c represents the amount of data that matches the candidate message format; c represents the total data volume of the action message; ci represents the amount of data generated corresponding to the ith unit time matched with each candidate message format; v0 represents a preset parameter reference value.
6. The method of claim 4, wherein the candidate message format comprises:
judging whether to replace the candidate message format or not through the evaluation parameter value matched with the candidate message format in the first time threshold;
and when the candidate message format is within the corresponding monitoring duration, the evaluation parameter value is smaller than the accumulated duration of the preset parameter threshold value and is lower than the preset proportion, replacing the candidate message format.
7. The method of claim 6, wherein the replacing the candidate message format comprises:
detecting the evaluation parameter values matched with the candidate message formats in real time;
if the evaluation parameter value is smaller than a preset parameter threshold, marking the candidate message format of which the evaluation parameter value is smaller than the preset parameter threshold to obtain a marked candidate message format;
and setting monitoring duration and preset proportion for the mark candidate message format.
8. The method of claim 7, wherein the monitoring duration is:
the preset proportion is as follows:
wherein T is the monitoring duration; p is a preset proportion; td is a first time threshold; vy is a parameter threshold; vm is the maximum evaluation parameter value; p0 is a proportional reference value.
9. The method of claim 1, wherein the monitoring device comprises:
and converting the acquired action message data and running state data of the relay protection equipment into a graphic data structure, and rendering the graphic data structure to enable the running state data to be displayed on a display of the monitoring equipment.
10. The method of claim 1, wherein the warning message comprises:
judging the type of the warning information according to the warning information;
and sending out a corresponding warning notice according to the type of the warning information, and displaying the warning notice on a display of the monitoring equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310863766.1A CN117074932A (en) | 2023-07-13 | 2023-07-13 | Relay protection online monitoring method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310863766.1A CN117074932A (en) | 2023-07-13 | 2023-07-13 | Relay protection online monitoring method |
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| CN117074932A true CN117074932A (en) | 2023-11-17 |
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