CN110970862A - Intelligent circuit breaker based on edge analysis technology and setting method - Google Patents
Intelligent circuit breaker based on edge analysis technology and setting method Download PDFInfo
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- CN110970862A CN110970862A CN201911396429.6A CN201911396429A CN110970862A CN 110970862 A CN110970862 A CN 110970862A CN 201911396429 A CN201911396429 A CN 201911396429A CN 110970862 A CN110970862 A CN 110970862A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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- 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
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- 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
- H02H3/02—Details
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- 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
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
- H02H3/042—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned combined with means for locating the fault
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- 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
- H02H3/08—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 responsive to excess current
- H02H3/10—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 responsive to excess current additionally responsive to some other abnormal electrical conditions
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- 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
- H02H3/20—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 responsive to excess voltage
- H02H3/207—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 responsive to excess voltage also responsive to under-voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/041—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature additionally responsive to excess current
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- Engineering & Computer Science (AREA)
- Artificial Intelligence (AREA)
- Evolutionary Computation (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention belongs to the field of circuit breakers and discloses an intelligent circuit breaker based on an edge analysis technology and a setting method thereof. The invention is provided with the first central processing unit integrated with the edge analysis algorithm, integrates the calculation of the edge of the Internet of things, improves the intelligent decision-making performance of the circuit breaker, effectively reduces the calculation load of an upper computer, slows down the pressure of data transmission to network bandwidth and improves the data processing efficiency.
Description
Technical Field
The invention relates to the technical field of circuit breakers, in particular to an intelligent circuit breaker based on an edge analysis technology and a setting method.
Background
The circuit breaker is a special electric appliance for connecting or disconnecting a circuit under normal or fault conditions, and is the most important safety protection equipment of a power grid. In contrast to stationary electrical devices such as transformers, reactors, and capacitors, circuit breakers are required to ensure accurate operation during frequent normal switching on and off and during a fault.
The data of the power grid can fluctuate within a certain range along with the time period of the power utilization facilities and users, so that the circuit breaker is required to judge whether the opening and closing are required or not and to cut off the circuit when the fault occurs according to actual conditions. However, in the prior art, the parameter setting of the circuit breaker is default setting when the circuit breaker leaves a factory or is controlled and set by an upper computer in a centralized manner, so that a large number of various electrical devices are arranged in a power grid, the workload of the upper computer is increased if the circuit breaker is managed by the upper computer in a centralized manner, and the corresponding time is prolonged, and therefore an intelligent circuit breaker capable of being adjusted in a self-adaptive manner based on an edge algorithm technology is needed.
Disclosure of Invention
The invention provides an intelligent circuit breaker based on an edge analysis technology and a setting method, and solves the problems that in the prior art, the parameter setting of the circuit breaker is default setting when the circuit breaker leaves a factory or is controlled and set by an upper computer in a centralized manner, the number of various electrical equipment in a power grid is large, the workload of the upper computer is increased if the circuit breaker is managed by the upper computer in a unified and centralized manner, and the corresponding time is prolonged.
The technical scheme of the invention is realized as follows:
the utility model provides an intelligent circuit breaker based on edge analysis technique, includes data acquisition unit, monitor cell and execution unit, the monitor cell includes integrated edge analysis algorithm's first central processing unit, second central processing unit and metering circuit, the data acquisition unit with metering circuit connects, first central processing unit respectively with second central processing unit and metering circuit electric connection, second central processing unit with the execution unit is connected.
As a preferred embodiment of the present invention, the data acquisition unit includes a voltage sampling circuit, a current sampling circuit, a leakage current detection circuit, and a temperature measurement circuit, and sends the voltage, the current, the leakage current detection data, and the temperature measurement data to the first central processing unit through the metering circuit, respectively.
In a preferred embodiment of the present invention, the voltage sampling circuit is formed by using a voltage sampling resistor.
As a preferred embodiment of the invention, the current sampling circuit is formed by adopting a current transformer or a manganese-copper sheet.
As a preferred embodiment of the present invention, the execution unit includes a switching-closing micromotor, a tripping micromotor, a manual/automatic transfer switch, and an indicator light, the second central processing unit outputs control signals to the switching-closing micromotor, the tripping micromotor, and the indicator light, respectively, and the manual/automatic transfer switch sends the control signals to the second central processing unit.
As a preferred embodiment of the present invention, the present invention further includes a lower computer communication circuit and an upper computer communication circuit electrically connected to the first central processing unit.
As a preferred embodiment of the present invention, the lower computer communication circuit is an RS485 communication circuit, and the upper computer communication circuit adopts a TCP/IP communication circuit, an RS485 communication circuit, an NB-IoT communication circuit, a 4G communication circuit, a 5G communication circuit, an HPLC communication circuit, a Zigbee communication circuit, or an LRAWAN communication circuit.
The power supply circuit is an AC220V/12V conversion circuit or an interface circuit connected with an external direct current 12V power supply.
An intelligent circuit breaker setting method based on an edge analysis technology specifically comprises the following steps:
s1, setting various parameter thresholds of the first central processing unit based on an edge analysis algorithm, specifically including over-voltage and under-voltage alarm threshold setting, over-voltage and under-voltage action threshold setting, over-current alarm threshold setting, over-current action threshold setting, electricity metering abnormity alarm threshold setting, switch temperature action threshold setting, switch sparking alarm threshold setting, switch sparking action threshold setting, switch leakage current alarm threshold setting and switch leakage current action threshold setting;
s2, the data acquisition unit acquires working voltage, working current, leakage current, electric quantity measurement, switch temperature, ignition pulse/zero-crossing time delay and sends the working voltage, the working current, the leakage current, the electric quantity measurement, the switch temperature and the ignition pulse/zero-crossing time delay to the first central processing unit;
s3, the first CPU judges whether the values of working voltage, working current, leakage current, electric quantity measurement, switch temperature, ignition pulse/zero-crossing delay exceed the set threshold, if yes, the first CPU executes alarm or trip action;
and S4, the first central processing unit uploads the data to the centralized management system.
The invention has the beneficial effects that: the first central processing unit integrated with the edge analysis algorithm is integrated with the calculation of the edge of the Internet of things, so that the intelligent decision performance of the circuit breaker is improved, the calculation load of an upper computer is effectively reduced, the pressure of data transmission to a network bandwidth is reduced, and the data processing efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic block diagram of an embodiment of an intelligent circuit breaker based on edge analysis techniques of the present invention;
FIG. 2 is an electrical schematic diagram of one embodiment of a smart circuit breaker based on edge analysis techniques of the present invention;
FIG. 3 is a schematic circuit diagram of a first CPU and a second CPU;
FIG. 4 is a circuit schematic of a metering circuit;
FIG. 5 is a circuit schematic of an execution unit;
FIG. 6 is one of the electrical schematic diagrams of the data acquisition unit;
FIG. 7 is a second schematic circuit diagram of the data acquisition unit;
FIG. 8 is a circuit schematic of a power circuit;
FIG. 9 is a flow chart of a method for setting an intelligent circuit breaker based on edge analysis techniques according to the present invention;
fig. 10 is a schematic flowchart of an intelligent breaker setting method based on an edge analysis technique according to the present invention.
In the figure, 1-data acquisition unit; 2-a monitoring unit; 201-a first central processor; 202-a second central processor; 203-a metering circuit; 3-execution unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1 to 4, the present invention provides an intelligent circuit breaker based on an edge analysis technology, including a data acquisition unit 1, a monitoring unit 2 and an execution unit 3, wherein the monitoring unit 2 includes a first central processing unit 201, a second central processing unit 202 and a metering circuit 203, the first central processing unit 201 is electrically connected to the second central processing unit 202 and the metering circuit 203, and the second central processing unit 202 is connected to the execution unit 3.
The first central processing unit 201 and the second central processing unit 202 may be formed by MCU chips, and the first central processing unit 201 is configured to collect monitoring data in a circuit, and implement functions of edge calculation, on-site processing, and data uploading to a communication management module. The second cpu 202 is used to control the circuit breaker to open and close the switch in time and to open the circuit in case of a fault. The metering circuit 203 is formed by an electricity metering chip and is used for metering circuit parameters.
The data acquisition unit 1 includes a voltage sampling circuit, a current sampling circuit, a leakage current detection circuit and a temperature measurement circuit, and respectively sends voltage, current, leakage current detection data and temperature measurement data to the first central processing unit 201 through the metering circuit 203. The voltage sampling circuit is formed by adopting a voltage sampling resistor. The current sampling circuit is formed by a current transformer or a manganese-copper sheet. The leakage current detection circuit is formed by a leakage current sensor, and the temperature measurement circuit is a circuit of the first cpu 201.
The execution unit 3 comprises a switching-on and switching-off micromotor, a tripping micromotor, a manual/automatic change-over switch and an indicator light, the second central processing unit 202 respectively outputs control signals to the switching-on and switching-off micromotor, the tripping micromotor and the indicator light, and the manual/automatic change-over switch sends the control signals to the second central processing unit 202. The indicator light can be used for indicating the working states of switching-on, tripping and manual/automatic conversion respectively. The shortest tripping time of the tripping micromotor is 15 ms.
The present invention further includes a lower computer communication circuit and an upper computer communication circuit electrically connected to the first central processing unit 201. The lower computer communication circuit is an RS485 communication circuit, and the upper computer communication circuit adopts a TCP/IP communication circuit, an RS485 communication circuit, an NB-IoT communication circuit, a 4G communication circuit, a 5G communication circuit, an HPLC communication circuit, a Zigbee communication circuit or an LRAWAN communication circuit. The lower computer communication circuit can be used for realizing data transmission among a plurality of circuit breakers. And the upper computer communication circuit is used for realizing data interaction between the circuit breaker and the superior monitoring platform.
The invention also comprises a power supply circuit which is an AC220V/12V conversion circuit or an interface circuit connected with an external direct current 12V power supply, and can be set at the same time, and the power supply mode is selected by the user.
As shown in fig. 9 and 10, the present invention also discloses an intelligent breaker setting method based on the edge analysis technology, which specifically includes the following steps:
s1, setting various parameter thresholds of the first central processing unit based on an edge analysis algorithm, specifically including over-voltage and under-voltage alarm threshold setting, over-voltage and under-voltage action threshold setting (switch body threshold when acquiescent), over-current alarm threshold setting, over-current action threshold setting (switch body threshold when acquiescent), electricity quantity metering abnormity alarm threshold setting, switch temperature action threshold setting, switch ignition alarm threshold setting, switch ignition action threshold setting, switch leakage current alarm threshold setting and switch leakage current action threshold setting;
s2, the data acquisition unit acquires working voltage, working current, leakage current, electric quantity measurement, switch temperature, ignition pulse/zero-crossing time delay and sends the working voltage, the working current, the leakage current, the electric quantity measurement, the switch temperature and the ignition pulse/zero-crossing time delay to the first central processing unit;
s3, the first CPU judges whether the values of working voltage, working current, leakage current, electric quantity measurement, switch temperature, ignition pulse/zero-crossing delay exceed the set threshold, if yes, the first CPU executes alarm or trip action;
and S4, the first central processing unit uploads the data to the centralized management system.
In other embodiments, the leakage current is an optional parameter, and the user can determine whether to collect the leakage current data.
The invention can improve the power supply reliability, reduce the line loss, improve the equipment operation environment, reduce the labor intensity of personnel, improve the working efficiency, save the human resources and the cost, and improve the service quality, thereby bringing economic and social benefits to people.
Economic aspect
And the benefit brought by the reliability of power supply is improved. Under the traditional equipment configuration and operation mode, any fault on the line causes tripping of the whole line, and after feeder automation is implemented, the fault can be isolated to the minimum range, so that economic loss caused by electric quantity loss is reduced.
The benefit brought by the line loss is reduced. After the power distribution automation construction is implemented, the grid structure can be optimized, the load can be reasonably controlled, and the operation mode can be adjusted, so that the line loss is reduced to the minimum; meanwhile, after the line is monitored in real time, the electricity stealing behavior can be found in time, so that the possibility of electricity stealing is greatly reduced, and great help is brought to the reduction of the line loss rate.
And the benefits brought by operation maintenance and management are reduced. After the functions of remote measurement, remote control, feeder automation and the like are realized, most of load measurement, operation and the like do not need to be carried out manually, so that the number of related operation operators can be reduced, the number of departure times is reduced, and vehicle allocation and daily expenditure can be correspondingly reduced.
Social aspect
And the economic loss of the user is reduced. The deterioration of the quality of electric energy varies from thousands of dollars to millions of dollars for users such as banks, data centers and customer service centers, and even higher for production facilities. After the adjustment, distribution and control are integrated, the power supply reliability can be improved, the power quality is greatly improved, and considerable economic benefits can be generated only by avoiding the loss of low-quality power to industrial and commercial users.
And the customer satisfaction is improved. The power failure times are less, the power failure time is short, the power supply quality is improved, the satisfaction degree of a user to a power supply department can be naturally increased, the social image of a power department is improved, and the potential user number and the power selling amount can be increased.
Environmental protection benefit. The efficient power grid will reduce energy consumption and reduce the emission of carbon dioxide and other pollutants. After the allocation and control are integrated, the grid structure can be optimized, the load can be reasonably controlled, the operation mode can be adjusted, and the electric energy loss of the power distribution network can be effectively reduced.
Management aspect
After the distribution automation system is built, the real-time data of the operation of distribution network equipment such as a switch and a distribution transformer are automatically acquired, and the operation condition of the equipment is monitored in real time; remote control operation is carried out on the switch, so that field work is reduced, and the working efficiency is improved; accident alarming and recording, report statistics and printing are realized, and system analysis application is provided; the distribution network operation diagram accurately corresponds to the actual geographic position, so that the specific positions and various operation data of the distribution equipment scattered in all corners of a city are quickly and accurately searched and provided, and the maintenance and accident emergency repair are facilitated. Meanwhile, through a power distribution automation means, the past complicated works such as field inspection, inspection and operation are greatly reduced, the working intensity of statistics, recording, searching, analysis and the like is reduced, the daily works such as business reports, power supply schemes and the like can be quickly finished, the working efficiency is greatly improved, the people reduction and the efficiency improvement of power supply enterprises are realized, and the production efficiency of the power supply enterprises is improved.
By means of management application based on the bus, lean management level is improved, technical means is provided for cooperation of all department businesses of a power supply company, and power supply management efficiency is greatly improved.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An intelligent circuit breaker based on edge analysis technology, characterized in that: the monitoring unit comprises a first central processing unit, a second central processing unit and a metering circuit, wherein the first central processing unit, the second central processing unit and the metering circuit are integrated with an edge analysis algorithm, the data acquisition unit is connected with the metering circuit, the first central processing unit is respectively electrically connected with the second central processing unit and the metering circuit, and the second central processing unit is connected with the execution unit.
2. An intelligent circuit breaker based on edge analysis technology according to claim 1, characterized in that: the data acquisition unit comprises a voltage sampling circuit, a current sampling circuit, a leakage current detection circuit and a temperature measurement circuit, and sends voltage, current, leakage current detection data and temperature measurement data to the first central processing unit through the metering circuit.
3. An intelligent circuit breaker based on edge analysis technology according to claim 2, characterized in that: the voltage sampling circuit is formed by adopting a voltage sampling resistor.
4. An intelligent circuit breaker based on edge analysis technology according to claim 2, characterized in that: the current sampling circuit is formed by a current transformer or a manganese-copper sheet.
5. An intelligent circuit breaker based on edge analysis technology according to claim 1, characterized in that: the second central processing unit respectively outputs control signals to the opening and closing micromotor, the tripping micromotor and the indicating lamp, and the manual/automatic change-over switch sends the control signals to the second central processing unit.
6. An intelligent circuit breaker based on edge analysis technology according to claim 1, characterized in that: the first CPU is electrically connected with a lower computer communication circuit and an upper computer communication circuit.
7. An intelligent circuit breaker based on edge analysis technology according to claim 6, characterized in that: the lower computer communication circuit is an RS485 communication circuit, and the upper computer communication circuit adopts a TCP/IP communication circuit, an RS485 communication circuit, an NB-IoT communication circuit, a 4G communication circuit, a 5G communication circuit, an HPLC communication circuit, a Zigbee communication circuit or an LRAWAN communication circuit.
8. An intelligent circuit breaker based on edge analysis technology according to claim 1, characterized in that: the power supply circuit is an AC220V/12V conversion circuit or an interface circuit connected with an external direct current 12V power supply.
9. An intelligent circuit breaker setting method based on an edge analysis technology is characterized by comprising the following steps:
s1, setting various parameter thresholds of the first central processing unit based on an edge analysis algorithm, specifically including over-voltage and under-voltage alarm threshold setting, over-voltage and under-voltage action threshold setting, over-current alarm threshold setting, over-current action threshold setting, electricity metering abnormity alarm threshold setting, switch temperature action threshold setting, switch sparking alarm threshold setting, switch sparking action threshold setting, switch leakage current alarm threshold setting and switch leakage current action threshold setting;
s2, the data acquisition unit acquires working voltage, working current, leakage current, electric quantity measurement, switch temperature, ignition pulse/zero-crossing time delay and sends the working voltage, the working current, the leakage current, the electric quantity measurement, the switch temperature and the ignition pulse/zero-crossing time delay to the first central processing unit;
s3, the first CPU judges whether the values of working voltage, working current, leakage current, electric quantity measurement, switch temperature, ignition pulse/zero-crossing delay exceed the set threshold, if yes, the first CPU executes alarm or trip action;
and S4, the first central processing unit uploads the data to the centralized management system.
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN111934273A (en) * | 2020-06-23 | 2020-11-13 | 上海红檀智能科技有限公司 | Intelligent miniature circuit breaker based on Internet of things sea computing technology and setting method |
CN111952943A (en) * | 2020-09-09 | 2020-11-17 | 中电科安科技股份有限公司 | An intelligent circuit breaker control device with metering function |
CN112332414A (en) * | 2020-10-28 | 2021-02-05 | 国网浙江杭州市萧山区供电有限公司 | Intelligent distribution box and system applied to low-voltage distribution transformer |
CN112510841A (en) * | 2020-12-09 | 2021-03-16 | 国网北京市电力公司 | Topology identification method and device for power distribution automation |
-
2019
- 2019-12-30 CN CN201911396429.6A patent/CN110970862A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN111934273A (en) * | 2020-06-23 | 2020-11-13 | 上海红檀智能科技有限公司 | Intelligent miniature circuit breaker based on Internet of things sea computing technology and setting method |
CN111952943A (en) * | 2020-09-09 | 2020-11-17 | 中电科安科技股份有限公司 | An intelligent circuit breaker control device with metering function |
CN112332414A (en) * | 2020-10-28 | 2021-02-05 | 国网浙江杭州市萧山区供电有限公司 | Intelligent distribution box and system applied to low-voltage distribution transformer |
CN112510841A (en) * | 2020-12-09 | 2021-03-16 | 国网北京市电力公司 | Topology identification method and device for power distribution automation |
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