CN112630582A - GIS loop defect diagnosis method and system based on hot bus inversion operation - Google Patents
GIS loop defect diagnosis method and system based on hot bus inversion operation Download PDFInfo
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Abstract
The invention provides a GIS (geographic information System) loop defect diagnosis method and a GIS loop defect diagnosis system based on hot bus reversing operation, wherein the method comprises the following steps: the method comprises the steps that a bus connection loop of each line in a hot bus-reversing operation transformer substation judges whether three-phase current of the bus connection loop is balanced or not and records a balance result; judging whether the bus-tie loop has defects according to the balance result: if the three-phase currents of the bus-coupled circuits of all the lines are balanced, the bus-coupled circuits are free of defects; if only the three-phase current imbalance occurs in the bus-coupled circuit of the single line, the isolating switch in the bus-coupled circuit of the line has defects; if the three-phase current imbalance occurs in the bus connection loops of the multiple lines, the buses of the bus connection loops have defects, and the bus defect sections are further positioned until the diagnosis is finished. The invention can be remotely controlled in an intelligent monitoring operation center, thereby omitting the complicated link of on-site loop resistance measurement and saving a large amount of manpower and material resources; meanwhile, the electric shock risk caused by misoperation is reduced.
Description
Technical Field
The invention relates to the technical field of power equipment fault diagnosis, in particular to a GIS (geographic information System) loop defect diagnosis method and system based on hot bus reversing operation.
Background
GIS equipment is a gas-insulated totally enclosed type switchgear, and its application is very extensive in modern electric wire netting, and it collects isolator, circuit breaker, mutual-inductor (voltage and output current), earthing device, lightning arrester, cable and generating line in an organic whole, and its advantage itself is also very showing: the volume is small, the weight is light, the modularized design integrates a plurality of functions, and the reliability is high. Because GIS equipment is a key equipment, once the equipment itself goes wrong, the maintenance degree of difficulty is big, and cost of maintenance is also high, and the loss that causes is very huge, probably causes the power failure accident on a large scale.
Some of the prior art use digital x-ray imaging detection systems to detect devices, mainly because the x-rays have absorption and scattering effects on the movement of the object, so that the diameter and intensity of the x-rays are changed. The degree of reduction in the scattering intensity of a material depends primarily on the attenuation coefficient of the light to the material and the refractive index and thickness of the material as the light passes directly through it. If there is a local difference in the thickness of the illuminated object, the transmission intensity of the local area will be different from that of the surrounding area. The sulfur hexafluoride does not cause decomposition of sulfur hexafluoride gas when exposed to x-rays, and does not affect the electrical insulation level of equipment. In GIS isolating switch equipment, the X-ray detection can easily find the internal abnormality, but cannot judge the internal dead angle area, and cannot judge whether the isolating switch is switched on or off in place.
In the prior art, GIS loop defects are detected by loop resistance test: conductor leading-out of some GIS equipment grounding switches is insulated from a GIS equipment shell, and a connecting bar between the leading-out conductor and the ground can be disassembled, so that the design is convenient for carrying out a loop resistance measurement test; and some GIS equipment earthing switch's conductor is directly connected with GIS equipment shell, does not have removable bank of connections, and this kind of design causes a lot of inconveniences to the return circuit resistance measurement. The GIS loop resistance is mainly measured through the grounding switch loop. For GIS equipment with a grounding switch conductor not insulated from a shell, firstly, the resistance of the GIS shell is measured, then, the resistance value of the conductor connected with the shell in parallel is measured, and then, the resistance of a main loop is calculated. In actual measurement, it is difficult to ensure whether the measurement points are consistent each time, and the measurement result is influenced by many factors, so that it is difficult to judge whether the measurement is qualified.
Meanwhile, the two prior arts are complicated and require a lot of manpower and material resources to participate.
Disclosure of Invention
The invention aims to provide a GIS (geographic information System) loop defect diagnosis method and system based on hot bus reversing operation, which aim to solve the technical problems that a large amount of manpower and material resources are required to be consumed and electric shock risk is large due to misoperation in the prior art.
The purpose of the invention can be realized by the following technical scheme:
the GIS loop defect diagnosis method based on hot inverted mother operation comprises the following steps:
the method comprises the steps that a bus connection loop of each line in a hot bus-reversing operation transformer substation judges whether three-phase current of the bus connection loop is balanced or not and records a balance result;
judging whether the bus-tie loop has defects according to the balance result:
if the three-phase currents of the bus-coupled circuits of all the lines are balanced, the bus-coupled circuits are free of defects;
if only the three-phase current imbalance occurs in the bus-coupled circuit of the single line, the isolating switch in the bus-coupled circuit of the line has defects;
if the three-phase current imbalance occurs in the bus connection loops of the multiple lines, the buses of the bus connection loops have defects, and the bus defect sections are further positioned until the diagnosis is finished.
Optionally, the step of determining whether the three-phase current of the bus-coupled circuit is balanced and recording a balance result of the bus-coupled circuit of each line in the hot bus-bar reversing operation substation is specifically as follows:
recording three-phase current data of a bus-coupled circuit of each line in hot bus reversing operation, calculating the three-phase current balance degree of the bus-coupled circuit according to the three-phase current data, judging whether the three-phase current balance degree is smaller than a preset balance degree threshold value or not, and if so, balancing the three-phase current of the bus-coupled circuit; and if not, the three-phase current of the bus-coupled loop is unbalanced.
Optionally, further positioning the bus bar defect segment until the diagnosis is finished specifically includes:
and analyzing the three-phase current data, starting positioning from the bus coupler loop of the outermost line, and gradually reducing the positioning range of the bus defect section until the diagnosis is finished.
Optionally, before the bus-tie loop of each line in the hot-reversed bus operation substation, the method further includes:
and under the condition of no power failure, constructing a bus-tie loop of each line.
Optionally, recording three-phase current data of the bus-tie circuit of each line in the hot bus reversing operation specifically includes:
and the dispatching automation system records the three-phase current data of the bus-coupled circuit in the hot bus-reversing operation process in real time.
The invention also provides a GIS loop defect diagnosis system based on hot bus inversion operation, which comprises:
the hot bus reversing operation module is used for a bus-coupled loop of each line in the hot bus reversing operation transformer substation, judging whether three-phase currents of the bus-coupled loop are balanced or not and recording a balance result;
and the defect judgment module is used for judging whether the bus link loop has defects according to the balance result:
if the three-phase currents of the bus-coupled circuits of all the lines are balanced, the bus-coupled circuits are free of defects;
if only the three-phase current imbalance occurs in the bus-coupled circuit of the single line, the isolating switch in the bus-coupled circuit of the line has defects;
if the three-phase current imbalance occurs in the bus connection loops of the multiple lines, the buses of the bus connection loops have defects, and the bus defect sections are further positioned until the diagnosis is finished.
Optionally, the step of determining whether the three-phase current of the bus connection loop is balanced and recording a balance result of the bus connection loop of each line in the hot bus reversing operation substation by the hot bus reversing operation module is specifically as follows:
recording three-phase current data of a bus-coupled circuit of each line in hot bus reversing operation, calculating the three-phase current balance degree of the bus-coupled circuit according to the three-phase current data, judging whether the three-phase current balance degree is smaller than a preset balance degree threshold value or not, and if so, balancing the three-phase current of the bus-coupled circuit; and if not, the three-phase current of the bus-coupled loop is unbalanced.
Optionally, the step of further positioning the bus defective segment by the defect judgment module until the diagnosis is finished specifically comprises:
and analyzing the three-phase current data, starting positioning from the bus coupler loop of the outermost line, and gradually reducing the positioning range of the bus defect section until the diagnosis is finished.
Optionally, the system further comprises a bus tie loop construction module, configured to construct a bus tie loop of each line without power outage before the bus tie loop of each line in the bus-operated substation is inverted.
Optionally, the hot bus reversing operation module records three-phase current data of the bus-coupled circuit of each line in the hot bus reversing operation, and the three-phase current data specifically includes:
and the dispatching automation system records the three-phase current data of the bus-coupled circuit in the hot bus-reversing operation process in real time.
The invention provides a GIS (geographic information System) loop defect diagnosis method and a GIS loop defect diagnosis system based on hot bus reversing operation, wherein the method comprises the following steps: the method comprises the steps that a bus connection loop of each line in a hot bus-reversing operation transformer substation judges whether three-phase current of the bus connection loop is balanced or not and records a balance result; judging whether the bus-tie loop has defects according to the balance result: if the three-phase currents of the bus-coupled circuits of all the lines are balanced, the bus-coupled circuits are free of defects; if only the three-phase current imbalance occurs in the bus-coupled circuit of the single line, the isolating switch in the bus-coupled circuit of the line has defects; if the three-phase current imbalance occurs in the bus connection loops of the multiple lines, the buses of the bus connection loops have defects, and the bus defect sections are further positioned until the diagnosis is finished.
Based on the technical scheme, the invention has the beneficial effects that: based on hot bus reversing operation, the three-phase current balance degree is used as an index, so that the defects of the isolating switch and the bus of the GIS loop can be conveniently judged; the remote operation and judgment based on the intelligent monitoring operation center and the EMS can simplify the complicated field operation process, save a large amount of manpower and material resources and save the complicated link of field loop resistance measurement in the traditional mode; meanwhile, the mistaken touch of field operation personnel on the electrified device and the electric shock risk are reduced. The invention has wider information application range and better application effect.
Drawings
FIG. 1 is a method flowchart of a GIS loop defect diagnosis method and system based on hot inverted mother operation according to the present invention;
fig. 2 is a schematic structural diagram of a GIS loop fault diagnosis method and system based on hot bus inversion operation according to an embodiment of the present invention.
Detailed Description
Interpretation of terms:
hot mother pouring: the switching of the lines or equipment on the buses between two buses is realized under the condition of no power failure.
The embodiment of the invention provides a GIS (geographic information System) loop defect diagnosis method and system based on hot bus reversing operation, which aim to solve the technical problems that a large amount of manpower and material resources are required to be consumed and electric shock risk is large due to misoperation in the prior art.
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
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 in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, the following is an embodiment of a GIS loop fault diagnosis method based on hot-tumbling operation, including:
the method comprises the steps that a bus connection loop of each line in a hot bus-reversing operation transformer substation judges whether three-phase current of the bus connection loop is balanced or not and records a balance result;
judging whether the bus-tie loop has defects according to the balance result:
if the three-phase currents of the bus-coupled circuits of all the lines are balanced, the bus-coupled circuits are free of defects;
if only the three-phase current imbalance occurs in the bus-coupled circuit of the single line, the isolating switch in the bus-coupled circuit of the line has defects;
if the three-phase current imbalance occurs in the bus connection loops of the multiple lines, the buses of the bus connection loops have defects, and the bus defect sections are further positioned until the diagnosis is finished.
Referring to fig. 2, in an embodiment, 110kV 1M and 2M buses run in parallel, all lines are hung with the 1M bus running, the 1M bus load is switched to the 2M bus running, and the 2M bus is switched from the running state to the hot standby state.
In the hot bus-reversing operation transformer substationBefore the bus-tie loop of each line, the bus-tie loop of each line needs to be constructed, and the specific method comprises the following steps: without power outage, check L0The bus coupler switch is in the on position, and at the moment, 1M and 2M are at the same potential; recheck the line Li(i is removal of the buscouple L0Line number of) is closed and connected to the 1M bus, and then the line L is closedi(i is removal of the buscouple L0Line number) connected to the 2M bus, constituting a line LiThe bus tie loop of (1).
In one embodiment, the bus tie loop of each line in the transformer substation is operated by hot bus reversing, and the three-phase current balance of the bus tie loop is judged. Specifically, in the process of hot bus bar reversing operation, three-phase current data of a bus bar circuit of each line are recorded, the three-phase current balance degree of the bus bar circuit is calculated according to the three-phase current data, whether the three-phase current balance degree is smaller than a preset balance degree threshold value or not is judged, and if yes, the three-phase current of the bus bar circuit is considered to be balanced; and if not, the three-phase current of the bus-tie loop is unbalanced. It should be noted that the three-phase current balance threshold cannot be summarized, and the three-phase current balance of the GIS devices at different voltage levels (110 kV and 220 kV) is different. The three-phase current balance threshold of the GIS device may be set in segments, for example, a three-phase current balance threshold of 100A or less is set to 4%, and a three-phase current balance threshold of 100A or more is set to 2%.
It should be noted that, in this embodiment, the hot bus reversing process may be remotely controlled in an intelligent monitoring operation center, and the three-phase current data of the bus-coupled loop is read in real time in an EMS (scheduling automation system), so as to determine and record the line L in real timeiWhether the three-phase current of the bus-tie circuit is balanced or not is judged, and then the circuit L is disconnectediThe isolating switch 1 of the bus-tie loop finishes the hot bus-reversing operation of the line. By analogy, the hot bus reversing operation of the bus-coupled loops of all lines of the transformer substation can be completed by the same method.
After the hot mother-falling operation is completed, whether a defect exists in the mother connection loop is judged according to the result of the hot mother-falling operation, and the following three conditions are mainly adopted:
(1) if the three-phase currents of the bus-coupled circuits of all the lines are balanced, judging that the isolating switches and the buses of the bus-coupled circuits of the lines have no obvious defects, and finishing fault diagnosis;
(2) if there is only a single line LiThe three-phase current of the bus-coupled circuit is unbalanced, and the three-phase current of the bus-coupled circuits of other circuits is balanced, so that the circuit L can be judgediThe isolating switch in the bus coupling loop has defects, such as unreliable pull-in, conductive shaft burn, lead screw, screw nut and part damage, and the like, and the system is required to be overhauled in time and the fault diagnosis is finished, so that the condition is common.
(3) If the three-phase current imbalance occurs in the bus-coupled circuit of the multiple lines, it can be determined that the bus of the bus-coupled circuit has a defect, and because the probability that the isolating switches of the multiple lines simultaneously have a fault is extremely low, the probability can be ignored.
For the bus defects of the bus-coupled loop, specific defect sections need to be further positioned. The specific method comprises the following steps: and analyzing the three-phase current data recorded in the hot bus-bar reversing operation, starting positioning from the bus-bar connection loop of the outermost line, and gradually reducing the positioning range of the bus fault until the diagnosis of the defect section of the bus is found out.
By bus coupling L0Right side is an example (where subscript r is right and L is left), if LrmAnd L0If the three-phase current imbalance does not occur in the bus coupling loop, the bus coupling L0Right whole bus-bar section (L)0The nodes of the isolating switches 1 and 2 and the 1M and 2M buses and LrmThe nodes of the isolating switches 1 and 2 and the 1M and 2M buses) are not defective;
if L isrmAnd L0When three-phase current imbalance occurs in the bus-tie circuit, the range is further narrowed, and L is observedr（m-1）And L0If the three-phase current imbalance does not occur in the bus coupling loop, the defective section of the bus is positioned as LrmAnd the nodes of the isolating switches 1 and 2M and the nodes Lr(m-1)The nodes of the isolating switches 1 and 2 and the 1M and 2M buses are divided into sections if L isr（m-1）And L0When three-phase current imbalance occurs in the bus-tie circuit, the size is further reducedThe range is analogized in the same way, and the line L with three-phase current balance is always foundiA bus-coupled loop for locating the defective section of the bus as LrmThe nodes of the isolating switches 1 and 2 and the 1M and 2M buses and LiThe nodes of the disconnecting switches 1 and 2 and the 1M and 2M buses are segmented, and the fault diagnosis is finished.
According to the GIS loop defect diagnosis method based on the hot bus reversing operation, the isolation switch defect and the bus defect of the GIS loop can be conveniently judged by using the three-phase current balance degree as an index based on the hot bus reversing operation; the method provided by the embodiment can be used for carrying out remote control and judgment on the intelligent monitoring operation center and the EMS, so that a large amount of manpower and material resources are saved, and a complicated link of field loop resistance measurement in a traditional mode is saved; meanwhile, the electric shock risk caused by misoperation is reduced.
The invention also provides an embodiment of a GIS loop defect diagnosis system based on hot bus reversing operation, which comprises the following steps:
the hot bus reversing operation module is used for a bus-coupled loop of each line in the hot bus reversing operation transformer substation, judging whether three-phase currents of the bus-coupled loop are balanced or not and recording a balance result;
and the defect judgment module is used for judging whether the bus link loop has defects according to the balance result:
if the three-phase currents of the bus-coupled circuits of all the lines are balanced, the bus-coupled circuits are free of defects;
if only the three-phase current imbalance occurs in the bus-coupled circuit of the single line, the isolating switch in the bus-coupled circuit of the line has defects;
if the three-phase current imbalance occurs in the bus connection loops of the multiple lines, the buses of the bus connection loops have defects, and the bus defect sections are further positioned until the diagnosis is finished.
The GIS loop defect diagnosis system based on the hot bus reversing operation provided by the embodiment can conveniently judge the defects of the isolating switch and the bus of the GIS loop by using the three-phase current balance degree as an index based on the hot bus reversing operation; the remote operation and judgment based on the intelligent monitoring operation center and the EMS can simplify the complicated field operation process, save a large amount of manpower and material resources and save the complicated link of field loop resistance measurement in the traditional mode; meanwhile, the mistaken touch of field operation personnel on the electrified device and the electric shock risk are reduced. The information application range of the embodiment is wider, and the application effect is better.
It is worth to be noted that, the fault diagnosis of the GIS loop can be performed, the entire GIS can be maintained in a power failure state, and the fault diagnosis of the GIS loop can be performed by adopting a voltage withstand test, a loop resistance test and an X-ray.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The GIS loop defect diagnosis method based on hot inverted mother operation is characterized by comprising the following steps:
the method comprises the steps that a bus connection loop of each line in a hot bus-reversing operation transformer substation judges whether three-phase current of the bus connection loop is balanced or not and records a balance result;
judging whether the bus-tie loop has defects according to the balance result:
if the three-phase currents of the bus-coupled circuits of all the lines are balanced, the bus-coupled circuits are free of defects;
if only the three-phase current imbalance occurs in the bus-coupled circuit of the single line, the isolating switch in the bus-coupled circuit of the line has defects;
if the three-phase current imbalance occurs in the bus connection loops of the multiple lines, the buses of the bus connection loops have defects, and the bus defect sections are further positioned until the diagnosis is finished.
2. The GIS circuit defect diagnosis method based on hot bus reversing operation according to claim 1, wherein the method for judging whether the three-phase current of the bus-coupled circuit is balanced and recording the balance result of the bus-coupled circuit of each line in the hot bus reversing operation transformer substation specifically comprises the following steps:
recording three-phase current data of a bus-coupled circuit of each line in hot bus reversing operation, calculating the three-phase current balance degree of the bus-coupled circuit according to the three-phase current data, judging whether the three-phase current balance degree is smaller than a preset balance degree threshold value or not, and if so, balancing the three-phase current of the bus-coupled circuit; and if not, the three-phase current of the bus-coupled loop is unbalanced.
3. The GIS loop defect diagnosis method based on hot bus reversing operation according to claim 2, characterized in that further positioning the bus defective segment until the diagnosis is finished specifically comprises:
and analyzing the three-phase current data, starting positioning from the bus coupler loop of the outermost line, and gradually reducing the positioning range of the bus defect section until the diagnosis is finished.
4. The GIS loop defect diagnosis method based on hot bus reversing operation according to claim 3, wherein the bus-coupled loop of each line in the hot bus reversing operation substation further comprises:
and under the condition of no power failure, constructing a bus-tie loop of each line.
5. The GIS (geographic information system) loop defect diagnosis method based on hot bus reversing operation as claimed in claim 4, wherein the recording of the three-phase current data of the bus-coupled loop of each line in the hot bus reversing operation is specifically as follows:
and the dispatching automation system records the three-phase current data of the bus-coupled circuit in the hot bus-reversing operation process in real time.
6. GIS return circuit defect diagnostic system based on mother's operation is fallen to heat, its characterized in that includes:
the hot bus reversing operation module is used for a bus-coupled loop of each line in the hot bus reversing operation transformer substation, judging whether three-phase currents of the bus-coupled loop are balanced or not and recording a balance result;
and the defect judgment module is used for judging whether the bus link loop has defects according to the balance result:
if the three-phase currents of the bus-coupled circuits of all the lines are balanced, the bus-coupled circuits are free of defects;
if only the three-phase current imbalance occurs in the bus-coupled circuit of the single line, the isolating switch in the bus-coupled circuit of the line has defects;
if the three-phase current imbalance occurs in the bus connection loops of the multiple lines, the buses of the bus connection loops have defects, and the bus defect sections are further positioned until the diagnosis is finished.
7. The GIS loop defect diagnosis system based on hot bus reversing operation according to claim 6, wherein the hot bus reversing operation module is used for hot bus reversing the bus-bar loop of each line in the transformer substation, judging whether the three-phase current of the bus-bar loop is balanced or not and recording the balance result specifically as follows:
recording three-phase current data of a bus-coupled circuit of each line in hot bus reversing operation, calculating the three-phase current balance degree of the bus-coupled circuit according to the three-phase current data, judging whether the three-phase current balance degree is smaller than a preset balance degree threshold value or not, and if so, balancing the three-phase current of the bus-coupled circuit; and if not, the three-phase current of the bus-coupled loop is unbalanced.
8. The GIS loop defect diagnosis system based on hot bus reversing operation as claimed in claim 7, wherein the defect judgment module further positions the bus defect segment until the diagnosis is finished specifically:
and analyzing the three-phase current data, starting positioning from the bus coupler loop of the outermost line, and gradually reducing the positioning range of the bus defect section until the diagnosis is finished.
9. The GIS loop defect diagnosis system based on bus hot-trip operation of claim 8, further comprising a bus tie loop constructing module for constructing the bus tie loop of each line in the transformer substation based on bus hot-trip operation without power outage.
10. The GIS circuit defect diagnosis system based on hot inverted busbar operation according to claim 9, wherein the hot inverted busbar operation module records three-phase current data of the busbar circuit of each line in the hot inverted busbar operation, specifically:
and the dispatching automation system records the three-phase current data of the bus-coupled circuit in the hot bus-reversing operation process in real time.
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| CN114460340A (en) * | 2022-02-10 | 2022-05-10 | 广东电网有限责任公司 | Bus unbalance rate calibration method, device and medium |
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