CN113013880A - Fault processing method based on 5G communication module distribution line - Google Patents

Fault processing method based on 5G communication module distribution line Download PDF

Info

Publication number
CN113013880A
CN113013880A CN202110425205.4A CN202110425205A CN113013880A CN 113013880 A CN113013880 A CN 113013880A CN 202110425205 A CN202110425205 A CN 202110425205A CN 113013880 A CN113013880 A CN 113013880A
Authority
CN
China
Prior art keywords
fault
terminal
line
type terminal
switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110425205.4A
Other languages
Chinese (zh)
Inventor
郭琳云
甘兴林
潘琦
张建涛
班诗淇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xi'an Xinghui Electric Power Technology Co ltd
Original Assignee
Xi'an Xinghui Electric Power Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xi'an Xinghui Electric Power Technology Co ltd filed Critical Xi'an Xinghui Electric Power Technology Co ltd
Priority to CN202110425205.4A priority Critical patent/CN113013880A/en
Publication of CN113013880A publication Critical patent/CN113013880A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
    • H02J3/00125—Transmission line or load transient problems, e.g. overvoltage, resonance or self-excitation of inductive loads
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
    • H02J3/0012—Contingency detection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention discloses a fault processing method based on a 5G communication module distribution line, which comprises a power distribution main station, terminal equipment, a 5G network communication module and a line tower, wherein the power distribution main station, an area type terminal and a unit type terminal are all provided with the 5G network communication module, the power distribution main station is in wireless connection with the area type terminal through the 5G network communication module, and the area type terminal is in wireless connection with the unit type terminal through the 5G network communication module. The invention has the beneficial effects that: the unit type terminal and the area type terminal are mutually cooperated through a 5G network communication module; the accuracy of fault judgment can be improved, the time for fault isolation and power supply recovery of a non-fault area is shortened, and the workload of operation and maintenance personnel is reduced; the running states of the line and the intelligent distribution room can be monitored in real time, operation and maintenance personnel are reminded of problems and risk points existing in line running, and the number of line faults is reduced; the number of times of short-time power failure of the line is reduced, the service time of equipment is prolonged, and the electricity utilization experience of a user is improved.

Description

Fault processing method based on 5G communication module distribution line
Technical Field
The invention relates to the technical field of distribution line fault processing, in particular to a fault processing method for a distribution line based on a 5G communication module.
Background
Among the prior art 10kV distribution lines distribute extensively, the operational environment is complicated, and the trouble is frequently sent out, how quick location, isolation fault after taking place the short-circuit fault to the distribution lines, resumes the regional power supply problem of non-trouble, and present solution adopts and is concentrated type feeder automation and type feeder automation mode on the spot and solve, like chinese patent: 1. a fault processing method of a power distribution network adopting regional locking (the publication number is CN 105552858B;); 2. an adaptive local feeder automation fault handling method based on the area serial number (public number: CN 109245072B); 3. the technical scheme of the distribution network ground fault analysis method (publication number: CN109324266A) based on deep learning is solved by adopting a centralized feeder automation mode or an in-situ feeder automation mode.
Centralized feeder automation flexibility is high, strong adaptability, nevertheless if distribution lines all adopt centralized feeder automation's mode, not only lay the optical cable and need consume a large amount of resources, the distribution main website will also bear huge pressure. The recloser type in-situ feeder automation needs the outgoing switch of the transformer substation to be matched with the outgoing switch repeatedly, so that the primary net rack feels multiple impacts, the user side feels multiple short-time incoming calls, the primary net rack is easily damaged, and the poor electricity utilization experience is brought to the user.
The distributed in-situ feeder automation can quickly process faults, but has high requirements on network communication, needs to lay optical cables, and has high manufacturing cost and difficult operation and maintenance.
The traditional in-situ feeder automation needs to be matched with the tripping delay and reclosing time limit of an outlet switch of a transformer substation, so that the fault can be automatically removed, but in a multi-section switch line, the fixed value matching difficulty among switches is high, and the time level difference cannot be matched; when the traditional in-situ feeder automation is used for processing faults, multiple tripping and reclosing of an outgoing line switch and a line section switch are used as application bases, and fault isolation and non-fault area power supply recovery can be generally completed only by two-time reclosing; if the switch is rejected and the switch is mistakenly tripped after the traditional feeder automation function is started, the feeder automation function logic is stopped and cannot be executed, so that the line fault processing is abnormal; the feeder terminal only has the function of providing the running condition and various parameters of the power distribution system and information required by monitoring and controlling, and the information can only be uploaded to a power distribution main station for analysis.
Therefore, it is necessary to provide a fault handling method based on the distribution line of the 5G communication module for the above problems.
Disclosure of Invention
In view of the above-mentioned shortcomings in the prior art, an object of the present invention is to provide a fault handling method based on a 5G communication module distribution line, so as to solve the above-mentioned problems.
A fault processing method based on a 5G communication module distribution line comprises a distribution main station, terminal equipment, a 5G network communication module and a line tower, wherein the terminal equipment comprises an area type terminal used for being in charge of edge calculation and a unit type terminal used for monitoring the line operation condition in real time, the area type terminal is installed on the line tower, the unit type terminal is also installed on the line tower, the distribution main station, the area type terminal and the unit type terminal are all provided with the 5G network communication module, the distribution main station is in wireless connection with the area type terminal through the 5G network communication module, and the area type terminal is in wireless connection with the unit type terminal through the 5G network communication module;
the line topology establishing method of the fault processing method comprises the following steps: when the unit type terminal is powered on, the information of the position of a tower where the unit type terminal is located is registered to the area type terminal for edge calculation, the area terminal for edge calculation synchronizes the registration information of all the area type terminals to all the unit type terminals of the line at intervals of a period of time (6-12 hours), and each area type terminal knows the positions of all the unit type terminals of the line;
if the equipment is in the running state for a long time, registering once every a period of time (6-12 hours); synchronizing the registration information of all the regional terminals to the unit type terminal once in each period of time (6-12 hours) by the regional terminal for edge calculation;
if the line running state has problems, corresponding measures are taken immediately according to the corresponding problems, the unit type terminals on the line are informed to make corresponding reactions, and the final processing result is reported to the power distribution main station. After the line is newly installed and disassembled, the terminal equipment on the line can automatically update the data information of the topological structure, wherein the data information comprises the position of a tower, the equipment number and the IP information of the Internet of things card.
A fault processing method based on a 5G communication module distribution line further comprises a short-circuit fault processing method, a ground fault processing method, a disconnection fault processing method, a distributed power management fault processing method, a power distribution network line management fault processing method, a communication abnormal fault processing method and a switch bounce rejection fault processing method.
The short-circuit fault processing method comprises the following steps: when a fault occurs, the terminal equipment at the upstream of the fault detects the fault, if the protection of the line switch has level difference coordination, the switch at the upstream of the fault, which is closest to a fault point, trips to remove the fault at the fastest speed, and if the protection of the line switch does not have level difference coordination, all the switches at the upstream of the fault trip to remove the fault at the fastest speed; when the fault is removed, the downstream terminal of the fault detects that the line is in a voltage loss state;
when the unit type terminal equipment at the upstream of the fault detects the short-circuit current, the information of the detected fault is uploaded to the area type terminal; when the terminal equipment at the downstream of the fault detects that the line is in a voltage loss state, the information of the detected line voltage loss is uploaded to the regional terminal;
after receiving the information of line fault or line voltage loss, the area type terminal waits for other unit type terminals to continuously send information, and starts to judge the fault area after the condition for judging the fault area is met; the conditions for starting to judge the fault area are as follows: firstly, receiving information sent by all unit type terminals on a line by an area type terminal; when the information received by the area type terminal already contains the information detected by all the terminal devices which are connected with the fault point directly before and after the fault point; setting a time delay, starting timing when the area type terminal receives the first information, and finishing the time delay and timing; when any one of the above conditions is met, the area type terminal starts fault analysis and positioning;
after the fault location of the area type terminal is completed, the unit type terminals at two ends of a fault point receive the fault location information of the area type terminal, the fault is processed according to the received information by combining the information detected by the unit type terminals and the opening and closing position of the switch, if the fault is an overcurrent fault, the switch is judged to be in a closing state or an opening state, if the fault is in the closing state, the switch is controlled to be opened, the switch is closed by forward locking, the upper stream fault isolation of the fault point is confirmed to be successful, if the fault is in the opening state, the switch is closed by forward locking, and the upper stream fault isolation of the fault point is confirmed to be successful; if the line is in voltage loss, judging whether the switch is in a switching-on state or a switching-off state, if the switch is in the switching-on state, controlling the switch to switch off, reversely locking and switching on, and confirming that the downstream fault isolation of a fault point is successful; if the fault point is in the switching-off state, the switching-on state is locked in the reverse direction, and the downstream fault isolation of the fault point is confirmed to be successful;
if the area type terminal is positioned at a certain end of a fault point, whether overcurrent fault or line voltage loss is detected by the area type terminal is judged, if the overcurrent fault exists, whether the switch is in a switching-on state or a switching-off state is judged, if the switching-on state exists, the switch is controlled to be switched off, the switch is switched on in a forward locking mode, the upstream fault isolation of the fault point is confirmed to be successful, and if the switching-off state exists, the switch is switched on in the forward locking mode, and the upstream fault isolation of the fault point is confirmed to be successful; if the line is in voltage loss, judging whether the switch is in a switching-on state or a switching-off state, if the switch is in the switching-on state, controlling the switch to switch off, reversely locking and switching on, and confirming that the downstream fault isolation of a fault point is successful; if the fault point is in the switching-off state, the switching-on state is locked in the reverse direction, and the downstream fault isolation of the fault point is confirmed to be successful;
after the regional terminal receives the information of reverse blocking of the downstream terminal equipment of the fault point, the regional terminal notifies the contact switch with contact transfer condition behind the terminal equipment of reverse blocking of the information that the fault is isolated, and the contact switch starts contact transfer after receiving the information of fault isolation.
The method for processing the ground fault comprises the following steps: when terminal equipment on a line detects zero-voltage sudden change, zero-sequence active power integral calculation is started, the integral time is 5 cycles, and the direction of zero-sequence current is monitored; after the zero sequence active power integration is completed, the unit type terminal simultaneously sends the calculated zero sequence power and the monitored zero sequence current direction to the regional type terminal, and the regional type terminal starts to judge a fault region after the information of the unit type terminal is collected; the process of judging grounding of the area type terminal is divided into two steps: the first step is line selection, and the second step is segment selection; the first step of line selection process: if the zero sequence current directions monitored by all terminals on the line are the same and the zero sequence active power is positive, the line can be judged to be a non-fault line, if the condition is not met, the grounding fault is judged to be located in the line, and the first line selection process is completed. The second step of the section selection process: if the earth fault is confirmed to be located in the line, the direction of the zero sequence current monitored by each terminal is judged, if the two terminals belong to the front and the back in the topological relation and the directions of the zero sequence currents are opposite, the earth fault can be judged to be located between the two terminals, if the directions of the zero sequence currents monitored by the terminals are the same, the positive and the negative of the zero sequence active power detected by each terminal device are judged, and if the two terminals belong to the front and the back in the topological relation and the detected zero sequence active power is positive and negative, the earth fault can be judged to be located between the two terminal devices. And then the regional terminal enables the terminal equipment positioned at two sides of the fault to be switched off and switched on in a locking way, and the switching-off and switching-on information is uploaded to the regional terminal, and after the regional terminal confirms that the fault region is successfully isolated, if the downstream line of the grounding point has a contact switching condition, the regional terminal informs the contact switch to be switched on for switching.
The disconnection fault processing method comprises a single-phase disconnection fault judging method and a two-phase disconnection fault judging method; the single-phase disconnection fault judgment method comprises the following steps: after a single-phase disconnection fault occurs, the fault characteristics monitored by the upstream equipment at the disconnection point are as follows: the phase current of the fault phase can be reduced, and the included angle of the phase current of the non-fault phase can be increased; the fault characteristics monitored by downstream equipment at the disconnection point are as follows: the voltage of a fault phase is reduced, two of the three line voltages are reduced to 0.5 time of rated line voltage, and one line voltage is kept unchanged; when two devices connected in topology respectively monitor the fault characteristics of the upper and lower streams of a single-phase disconnection point, disconnection faults occur between the two devices;
the two-phase disconnection fault judgment method comprises the following steps: after a two-phase disconnection fault occurs, the fault characteristics monitored by the upstream equipment at the disconnection point are as follows: the three-phase current is reduced or the two-phase current is increased; the fault characteristics monitored by downstream equipment at the disconnection point are as follows: the three-phase voltage is reduced, the phases are the same, and the line voltage is reduced to zero; when two topologically connected devices respectively monitor the fault characteristics of the upper and lower streams of the two-phase disconnection point, the disconnection fault occurs between the two devices.
After the broken line fault section is judged, the regional terminal sends information for judging the fault region to the terminal equipment at two ends of the fault, and after the terminal equipment at two ends of the fault receives the information, the terminal equipment starts to switch off, is switched on in a locking mode, and cuts off the fault. Then the terminal equipment on both sides of the fault sends the information that the fault is isolated to the regional terminal, the regional terminal judges whether the non-fault region at the downstream of the disconnection point needs to be subjected to contact transfer and has the condition that the contact transfer is not carried out, if the condition that the contact transfer is carried out is needed, the regional terminal sends the information of the contact transfer to the corresponding contact switch, and the contact switch receives the information and then performs the contact transfer.
The management method of the distributed power supply comprises the following steps: on a line with a distributed power supply, when a short-circuit fault occurs, fault current flowing into a fault point is superposition of fault currents of two power supply points of a transformer substation and the distributed power supply. When a fault occurs between the topological positions of the transformer substation and the distributed power supply, the directions of fault currents from a fault point to two power supply points are opposite, the fault current cannot be detected by terminal equipment of a non-fault loop, and at the moment, a fault area is located between two terminal equipment which are connected with the topological structure and detect opposite fault currents. When a fault occurs at the same side of the topological positions of the transformer substation and the distributed power supply, the directions of fault currents detected by terminal equipment on a fault loop are consistent, and a fault area is located between two terminal equipment which are connected with the topological structure and detect the fault currents and two terminal equipment which do not detect the fault currents. After the fault section is judged, the regional terminal sends information of the fault region to the unit type terminal, the terminals on two sides of the fault receive the information of the fault region and then judge switching-on and switching-off information of a switch, if the terminals are in a switching-on position, switching-off and switching-on are locked, if the terminals are in a switching-off position, switching-on and switching-off are directly locked, and the information of the switching-on and switching-off is sent to the regional terminal. And the regional terminal confirms the fault isolation condition according to the received locking and closing information, and when the terminals on two sides of the fault are both opened and closed, the fault isolation is completed. And the area type terminal sends information of successful fault isolation to the terminals which are not positioned at the two sides of the fault area and the contact switch, and the terminals which are not positioned at the two sides of the fault area and the terminals with contact transfer conditions start to recover the power supply of the non-fault area.
The management method of the power distribution network line comprises the following steps: the unit type terminal can timely send the monitored voltage and current information to the regional type terminal, the opening and closing information of a switch of the unit type terminal can also be uploaded to the regional type terminal, and when the regional type terminal receives that the voltage and the current sent by a certain unit type terminal are abnormal and other terminals do not find the abnormality, the operation fault of a voltage or current sensor of the switch is indicated, the voltage or current sensor needs to be overhauled and replaced, and a responsible person of a circuit is informed;
if the regional terminal frequently receives the switching-on and switching-off information of a certain unit type terminal, the fact that the unit type terminal or a corresponding switch body has a fault and needs to be maintained or replaced is proved, and a circuit responsible person is informed;
if the regional terminal and a certain unit type terminal are frequently broken and the information of the unit type terminal cannot be received, on the premise of eliminating signal factors, the unit type terminal can be considered to have a fault, needs to be repaired and replaced, and informs line responsible personnel.
Compared with the prior art, the invention has the beneficial effects that:
(1) the unit type terminal and the area type terminal are mutually cooperated through a 5G network communication module, and the changed line topological structure is automatically updated; the accuracy of fault judgment can be improved, the time for fault isolation and power supply recovery of a non-fault area is shortened, and the workload of operation and maintenance personnel is reduced; the method can be suitable for lines with distributed power supplies, and management of the distributed power supplies is optimized; the running states of the line and the intelligent distribution room can be monitored in real time, operation and maintenance personnel are reminded of problems and risk points existing in line running, and the number of line faults is reduced; (2) the frequency of impact of fault current on an electric power system can be reduced, the frequency of short-time power failure of a circuit is reduced, the service time of equipment is prolonged, and the electricity utilization experience of a user is improved. The multistage segmentation of a longer line becomes possible, and the fault isolation time is faster; the time for recovering the power supply of the non-failure area is shorter; (3) impact on the transformer substation is reduced; the setting number of the fixed values is less than that of the traditional feeder automation, so that the debugging, the installation and the maintenance of equipment are facilitated; the device error jumping and rejection can be corrected through the communication between the devices; (4) the wire breakage detection is convenient; the ground fault detection is more accurate; the distributed power supply can be managed, and the circuit can be monitored.
Drawings
FIG. 1 is a schematic diagram of a fault handling method of a distribution line based on a 5G communication module according to the invention;
FIG. 2 is a layout of the terminal of the present invention on a tower;
FIGS. 3 to 8 are structural diagrams of embodiments of short-circuit fault processing according to the present invention;
fig. 9 to 13 are structural diagrams of an embodiment of a ground fault processing method of the present invention;
FIGS. 14-18 are block diagrams of method embodiments of disconnection fault handling of the present invention;
fig. 19 to 24 are structural diagrams of embodiments of distributed power supply management processing according to the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
As shown in fig. 1 in combination with fig. 2 to 24, a fault handling method for a distribution line based on a 5G communication module includes a distribution master station, a terminal device, a 5G network communication module, and a line tower, where the terminal device includes a regional terminal for performing edge calculation and a unit-type terminal for monitoring a line operation condition in real time, the regional terminal and the unit-type terminal are installed on the line tower, the distribution master station, the regional terminal, and the unit-type terminal are all provided with the 5G network communication module, the distribution master station is wirelessly connected with the regional terminal through the 5G network communication module, and the regional terminal is wirelessly connected with the unit-type terminal through the 5G network communication module;
the method for establishing the topological structure of the fault processing method comprises the following steps: when the unit type terminal is powered on, the position information of the tower where the unit type terminal is located is registered to the area type terminal for edge calculation, the area terminal for edge calculation synchronizes the registration information of all the area type terminals to all the unit type terminals of the line once every 6 to 12 hours, and each area type terminal knows the positions of all the unit type terminals of the line;
if the equipment is in the running state for a long time, registering once every 6-12 hours; synchronizing the registration information of all the regional terminals to the unit type terminal once every 6-12 hours by the regional terminal which performs the edge calculation;
if the line running state has problems, corresponding measures are taken immediately according to the corresponding problems, the unit type terminals on the line are informed to make corresponding reactions, and the final processing result is reported to the power distribution main station.
The data information comprises the position of the tower, the equipment number and the IP information of the Internet of things card.
A fault processing method based on a 5G communication module distribution line comprises a short-circuit fault processing method, a ground fault processing method, a disconnection fault processing method, distributed power supply management, power distribution network line management, a communication abnormity processing method and a switch bounce rejection processing method.
The short-circuit fault processing method comprises the following steps: when a fault occurs, the terminal equipment at the upstream of the fault detects the fault, if the protection of the line switch has level difference coordination, the switch at the upstream of the fault, which is closest to a fault point, trips to remove the fault at the fastest speed, and if the protection of the line switch does not have level difference coordination, all the switches at the upstream of the fault trip to remove the fault at the fastest speed; when the fault is removed, the downstream terminal equipment of the fault can detect that the line is in a voltage loss state;
when the unit type terminal equipment at the upstream of the fault detects the short-circuit current, the information of the detected fault is uploaded to the area type terminal; when the terminal equipment at the downstream of the fault detects that the line is in a voltage loss state, the information of the detected line voltage loss is uploaded to the regional terminal;
after receiving the information of line fault or line voltage loss, the area type terminal waits for other unit type terminals to continuously send information, and starts to judge the fault area after the condition for judging the fault area is met; the conditions for starting to judge the fault area are as follows: firstly, receiving information sent by all unit type terminals on a line by an area type terminal; when the information received by the area type terminal already contains the information detected by all the terminal devices which are connected with the fault point directly before and after the fault point; setting a time delay, starting timing when the area type terminal receives the first information, and finishing the time delay and timing; when any one of the above conditions is met, the area type terminal starts fault analysis and positioning;
after the fault location of the area type terminal is completed, the unit type terminals at two ends of a fault point receive the fault location information of the area type terminal, the fault is processed according to the received information by combining the information detected by the unit type terminals and the opening and closing position of the switch, if the fault is an overcurrent fault, the switch is judged to be in a closing state or an opening state, if the fault is in the closing state, the switch is controlled to be opened, the switch is closed by forward locking, the upper stream fault isolation of the fault point is confirmed to be successful, if the fault is in the opening state, the switch is closed by forward locking, and the upper stream fault isolation of the fault point is confirmed to be successful; if the line is in voltage loss, judging whether the switch is in a switching-on state or a switching-off state, if the switch is in the switching-on state, controlling the switch to switch off, reversely locking and switching on, and confirming that the downstream fault isolation of a fault point is successful; if the fault point is in the switching-off state, the switching-on state is locked in the reverse direction, and the downstream fault isolation of the fault point is confirmed to be successful;
if the area type terminal is positioned at a certain end of a fault point, whether overcurrent fault or line voltage loss is detected by the area type terminal is judged, if the overcurrent fault exists, whether the switch is in a switching-on state or a switching-off state is judged, if the switching-on state exists, the switch is controlled to be switched off, the switch is switched on in a forward locking mode, the upstream fault isolation of the fault point is confirmed to be successful, and if the switching-off state exists, the switch is switched on in the forward locking mode, and the upstream fault isolation of the fault point is confirmed to be successful; if the line is in voltage loss, judging whether the switch is in a switching-on state or a switching-off state, if the switch is in the switching-on state, controlling the switch to switch off, reversely locking and switching on, and confirming that the downstream fault isolation of a fault point is successful; if the fault point is in the switching-off state, the switching-on state is locked in the reverse direction, and the downstream fault isolation of the fault point is confirmed to be successful;
after the regional terminal receives the information of reverse blocking of the downstream terminal of the fault point, the regional terminal notifies the contact switch with contact transfer condition behind the terminal of reverse blocking of the information that the fault is isolated, and the contact switch starts contact transfer after receiving the information of fault isolation.
The method for processing the ground fault comprises the following steps: when terminal equipment on a line detects zero-voltage sudden change, zero-sequence active power integral calculation is started, the integral time is 5 cycles, and the direction of zero-sequence current is monitored; after the zero sequence active power integration is completed, the unit type terminal simultaneously sends the calculated zero sequence power and the monitored zero sequence current direction to the regional type terminal, and the regional type terminal starts to judge a fault region after the information of the unit type terminal is collected; the process of judging grounding of the area type terminal is divided into two steps: the first step is line selection, and the second step is segment selection; the first step of line selection process: if the zero sequence current directions monitored by all terminals on the line are the same and the zero sequence active power is positive, the line can be judged to be a non-fault line, if the condition is not met, the grounding fault is judged to be located in the line, and the first line selection process is completed. The second step of the section selection process: if the earth fault is confirmed to be located in the line, the direction of the zero sequence current monitored by each terminal is judged, if two terminal devices belong to the front and the back in the topological relation and the directions of the zero sequence currents are opposite, the earth fault can be judged to be located between the two terminals, if the directions of the zero sequence currents monitored by the terminals are the same, the positive and the negative of the zero sequence active power detected by each terminal device are judged, and if the two terminal devices belong to the front and the back in the topological relation and the detected zero sequence active power is positive and negative, the earth fault can be judged to be located between the two terminal devices.
When the regional terminal judges a fault region, the regional terminal enables the terminals on two sides of the fault to be switched off and switched on in a locking mode, information of switching off and switching on in the locking mode is sent to the regional terminal, and after the regional terminal confirms that the fault region is successfully isolated, if a contact switching condition exists in a downstream line of the grounding point, the regional terminal informs the contact switch to be switched on for switching on.
The disconnection fault processing method comprises a single-phase disconnection fault judging method and a two-phase disconnection fault judging method; the single-phase disconnection fault judgment method comprises the following steps: after a single-phase disconnection fault occurs, the fault characteristics monitored by the upstream equipment at the disconnection point are as follows: the phase current of the fault phase can be reduced, and the included angle of the phase current of the non-fault phase can be increased; the fault characteristics monitored by downstream equipment at the disconnection point are as follows: the voltage of a fault phase is reduced, two of the three line voltages are reduced to 0.5 time of rated line voltage, and one line voltage is kept unchanged; when two devices connected in topology respectively monitor the fault characteristics of the upper and lower streams of a single-phase disconnection point, disconnection faults occur between the two devices;
the two-phase disconnection fault judgment method comprises the following steps: after a two-phase disconnection fault occurs, the fault characteristics monitored by the upstream equipment at the disconnection point are as follows: the three-phase current is reduced or the two-phase current is increased; the fault characteristics monitored by downstream equipment at the disconnection point are as follows: the three-phase voltage is reduced, the phases are the same, and the line voltage is reduced to zero; when two topologically connected devices respectively monitor the fault characteristics of the upper and lower streams of the two-phase disconnection point, the disconnection fault occurs between the two devices.
And after the fault section is confirmed, the regional terminal sends information for judging the fault region to the terminals at two ends of the fault, and after the terminals at two ends of the fault receive the information, the terminals start to switch off and switch on in a locking way, so that the fault is removed. Then the terminals at two sides of the fault send information that the fault is isolated to the regional terminal, the regional terminal judges whether the non-fault region at the downstream of the disconnection point needs to be subjected to contact transfer and has no condition for contact transfer, if the non-fault region needs to be subjected to contact transfer and has the condition for contact transfer, the regional terminal sends the information for contact transfer to the corresponding contact switch, and the contact switch receives the information and then performs contact transfer.
The management method of the distributed power supply comprises the following steps: on a line with a distributed power supply, when a short-circuit fault occurs, fault current flowing into a fault point is superposition of fault currents of two power supply points of a transformer substation and the distributed power supply. When a fault occurs between the topological positions of the transformer substation and the distributed power supply, the directions of fault currents from a fault point to two power supply points are opposite, the fault current cannot be detected by terminal equipment of a non-fault loop, and at the moment, a fault area is located between two terminals which are connected with the topological structure and detect that the fault currents are opposite. When a fault occurs at the same side of the topological positions of the transformer substation and the distributed power supply, the directions of fault currents detected by terminal equipment on a fault loop are consistent, and a fault area is located between two terminals which are connected with the topological structure, detect the fault currents and do not detect the fault currents.
The management method of the power distribution network line comprises the following steps: the unit type terminal can timely send the monitored voltage and current information to the regional type terminal, the opening and closing information of a switch of the unit type terminal can also be uploaded to the regional type terminal, and when the regional type terminal receives that the voltage and the current sent by a certain unit type terminal are abnormal and other terminals do not find the abnormality, the operation fault of a voltage or current sensor of the switch is indicated, the voltage or current sensor needs to be overhauled and replaced, and a responsible person of a circuit is informed;
if the regional terminal frequently receives the switching-on and switching-off information of a certain unit type terminal, the fact that the unit type terminal or a corresponding switch body has a fault and needs to be maintained or replaced is proved, and a circuit responsible person is informed; if the regional terminal and a certain unit type terminal are frequently broken and the information of the unit type terminal cannot be received, on the premise of eliminating signal factors, the unit type terminal can be considered to have a fault, needs to be repaired and replaced, and informs line responsible personnel.
The method for processing the communication abnormity comprises the steps of processing the communication abnormity of the unit type terminal and processing the communication abnormity of the area type terminal;
the unit type terminal communication abnormity processing method comprises the following steps: when no abnormal line operation occurs, the regional terminal sends heartbeat packets to the unit type terminals at regular time, if the reply of one unit type terminal cannot be received within a certain time, the unit type terminal is considered to be abnormal in communication, and abnormal information is reported to the power distribution master station.
When the line operation is abnormal, if the heartbeat reply of a certain unit type terminal of the line and the fault information sent by the fault cannot be received within a determined time, the unit type terminal is considered to be abnormal in communication, if the switch is positioned in a fault area at the upstream of the fault, the regional type terminal enables a switch at the upper stage of the regional type terminal to be switched off and is switched on in a forward locking way, and if the switch is positioned at the upstream of the fault but is not positioned in the fault area, the switch is ignored in the processing process; if the switch is located in a fault area at the downstream of the fault, the regional terminal enables the switch at the next stage to be switched off and reversely locked and switched on, and if the switch is located at the downstream of the fault but is not located in the fault area, the switch is ignored in the processing process; if the contact switch is used, the contact is not related to the contact switch.
The method for processing the communication exception of the regional terminal comprises the following steps: setting a regional terminal priority, when a line normally runs, if a unit type terminal cannot receive a heartbeat packet or replies heartbeat failure, sending information to a terminal at a second priority, automatically converting a role of the second priority terminal into a regional terminal after the second priority terminal cannot receive the heartbeat packet or replies heartbeat failure or receives information of other unit type terminals, treating the previous regional terminal as the unit type terminal, starting to execute calculation at the same time, and reporting information of abnormal communication to a power distribution master station;
when the line operation has a fault, if the unit type terminal cannot receive the heartbeat packet, reply the heartbeat or fail to send the fault information, the information can be sent to the terminal at the second priority level, and after the terminal at the second priority level cannot receive the heartbeat packet, reply the heartbeat failure, fail to send the fault information or receive the information of other unit type terminals, the automatic role conversion is carried out to the area type terminal, the calculation is carried out, the fault isolation is carried out and the power supply of the non-fault area is recovered according to the established strategy.
The method for processing the switch rejection is to isolate the fault through the opening of the upper-level (fault upstream) or lower-level (fault downstream) switches of the switches if the switches on the two sides of the fault area are rejected. If the switch of the fault upstream non-fault area refuses to be switched off, the logic of the scheme cannot be influenced during the fault isolation and the non-fault area power supply recovery, the scheme can completely realize fault isolation and the non-fault area power supply recovery.
Compared with the prior art, the invention has the beneficial effects that:
(1) the unit type terminal and the area type terminal are mutually cooperated through a 5G network communication module, and the changed line topological structure is automatically updated; the accuracy of fault judgment can be improved, the time for fault isolation and power supply recovery of a non-fault area is shortened, and the workload of operation and maintenance personnel is reduced; the method can be suitable for lines with distributed power supplies, and management of the distributed power supplies is optimized; the running states of the line and the intelligent distribution room can be monitored in real time, operation and maintenance personnel are reminded of problems and risk points existing in line running, and the number of line faults is reduced; the frequency of impact of fault current on an electric power system can be reduced, the frequency of short-time power failure of a circuit is reduced, the service time of equipment is prolonged, and the electricity utilization experience of a user is improved.
(2) The multistage segmentation of the longer line is made possible: only fault information positioned at the upstream of the fault and non-fault information positioned at the downstream of the fault in the feeder line are needed, so that the fault position can be positioned as long as the fault is detected by the switch at the upstream of the fault and the fault is not detected by the switch at the downstream of the fault, and the matching of all switches with level differences is not needed;
(3) the fault isolation time is faster: the fault is isolated through information interaction between terminals, the communication delay between the terminals based on the 5G communication technology and the terminals can reach the millisecond level, the fault positioning is fast, the fault isolation is fast, the traditional in-place feeder automation needs the primary and the secondary superposition to position a fault area and isolate the fault, the more switches are, the longer the time is consumed;
(4) the power supply time for recovering the non-failure area is shorter: according to the scheme, the power supply of a non-fault area is recovered through the communication between the unit type terminal and the area type terminal, the communication delay of the terminal equipment based on the 5G communication technology can reach the millisecond level, the fault isolation is fast, the power supply of the non-fault area is rapidly recovered, the power supply of the non-fault area is recovered by the primary and secondary superposition in the traditional local feeder automation mode, the more switches are, and the longer the time is consumed;
(5) impact on the substation is reduced: the fault can be isolated only by jumping once when the fault occurs at most, the power supply of a non-fault area can be recovered when the fault occurs next time, and the system can be impacted by a large current at most once; when the level difference is matched, the system and the transformer substation are impacted by large current only when the fault occurs, and the outgoing line switch of the transformer substation cannot be tripped, a non-fault area at the downstream of the fault can only feel short-time power loss once, when the fault occurs, the system and the transformer substation are impacted by large current only once, the transformer substation switches only need to be superposed once, and the non-fault area can only feel short-time power loss once;
(6) the IP of the terminal Internet of things card and the pole number of the position where the terminal equipment is located are only needed, so that the workload of field debugging and installation is greatly reduced;
(7) the device error jumping and rejection can be corrected through the communication between the devices: whether the fault exists is confirmed through communication, if the fault exists and the switch refuses to be separated, the primary power failure is enlarged, if the fault exists, the condition of recovering the power supply is not met, if the fault exists, the power supply is recovered in a superposition mode, and a good fault-tolerant measure can be achieved;
(8) the broken line detection is convenient: the terminal equipment can send the electrical characteristic quantities before and after the disconnection point to the area type terminal, and the area type terminal can quickly and accurately position the fault according to the received information;
(9) the ground fault detection is more accurate: the unit type terminal can monitor the electrical characteristic quantities before and after the grounding point and send the electrical characteristic quantities to the area type terminal, and the area type terminal positions the fault area according to the difference of the electrical characteristic quantities before and after the grounding point, so that the speed is high, and the accuracy is high;
(10) management of distributed power supplies: the scheme can be suitable for circuits with distributed power supplies, fault areas can be accurately positioned, when power supply of non-fault areas is recovered, when planned isolated island operation is met, the distributed power supplies can be operated in an isolated island mode, and when isolated island operation conditions are not met, the distributed power supplies can be directly thrown away;
(11) monitoring the circuit: the line is taken as a unit, the terminal equipment on the line can autonomously analyze the running condition and various parameters of the line and monitor and control required information, and the result is directly sent to the power distribution main station, so that the running pressure of the main station can be reduced, and the efficiency is improved.
Wherein the position of the tower is represented as: the mode that shaft tower position shows is:
1. if the terminal is on the trunk: the pole tower position is the pole number-0-0 where the slave trunk terminal is located.
2. If the terminal is on a branch: the position of the pole tower is as follows: the pole number that comes out from the trunk line "T" -the pole number at which the branch line terminal is located-0.
3. If the terminal is on the secondary branch: the position of the pole tower is as follows: the number of the pole connected from the trunk line T, the number of the pole connected from the branch line T and the number of the pole where the terminal of the secondary branch line is located; as shown in fig. 2: the tower position of switch No. 1 is represented as: 5-0-0; the tower position of switch No. 2 is expressed as: 25-0-0; the tower position of switch No. 3 is expressed as: 55-0-0; the tower position of switch No. 4 is expressed as: 20-15-0; the tower position for switch No. 5 is shown as: 20-40-15.
Example 1
Short-circuit fault processing mode:
the fault judgment principle is as follows: when a short-circuit fault occurs in a line, the current upstream of the short-circuit fault point is increased, and the current downstream of the fault point does not change greatly, so that the terminal equipment upstream of the fault point can detect a large fault current, and the terminal equipment downstream of the fault point can detect the load current when the line normally operates. If the protection action is carried out after the terminal equipment detects the fault large current, the switch is switched off, the terminal equipment at the downstream of the fault point can detect that the line is in a voltage loss state, and when the two terminal equipment connected in the topology respectively detect the fault large current and the line voltage loss, the fault point is located between the two terminal equipment.
Processing embodiments are shown in fig. 3 to 8, wherein if the protection of the transformer substation is free of time delay, the fixed value cannot be set, and the CB protection range is long, the protection is free of level difference matching; (1) a permanent fault occurs between the FS2 and the FS3, and the outgoing switches CB, FS1 and FS2 of the substation detect the fault; (2) since there is no step difference, FS2, FS1, CB switches detect the fault trip and send information on the detected fault to the area type terminal FS1, and then the switches of FS3-FS5 detect the line loss voltage while sending information on the detected line loss voltage to the area type terminal FS 1. The interconnection switch LSW1 sends information that the single-side voltage loss is detected to the area type terminal FS 1; (3) after receiving the information from the unit type terminal, the area type terminal FS1 positions the fault between the switch FS2 and the switch FS3 by combining the fault information detected by the area type terminal FS1, then sends the information located in the fault area to the switches FS2 and FS3, after the switches FS2 and FS3 receive the information, the switches FS2 are closed in a forward locking mode, and the switches FS3 are opened firstly and then closed in a reverse locking mode; (4) after the switch FS2 and the switch FS3 are locked and closed, the fault is successfully isolated, and then information that the switch is locked and closed and the fault is isolated is sent to the regional terminal FS 1; (5) the regional terminal FS1 receives the information that the fault is isolated and sent by the switches FS2 and FS3 on the two sides of the fault; the regional terminal FS1 supplies power to the upstream non-fault region which judges that the terminal can be switched on to recover the fault, and the FS1 is switched on; the regional terminal FS1 issues information that the fault is cleared and can be communicated for switching to supply to the communication switch LSW1, and the communication switch switches to supply; (6) and the outgoing line switches CB of the transformer substation are overlapped, and the power supply of the non-fault area of the line is recovered.
Example 2;
the technical principle of fault judgment of the mode of ground fault processing is as follows: the overhead line can be divided into a large-current grounding system and a small-current grounding system according to the grounding mode of a neutral point of a transformer substation, wherein the large-current grounding system refers to a neutral point direct grounding system and a neutral point grounding system through a small resistor, and the small-current grounding system refers to a neutral point ungrounded system and a neutral point grounding system through an arc suppression coil. At most, a low current grounding system is applied to a distribution line, but in recent years, as urban cable lines increase and grow, cases of applying a low resistance grounding mode are increasing.
In a distribution line, for a system without a neutral point grounded, when a single-phase ground fault occurs in the line, the zero-sequence voltage on the line changes suddenly, the zero-sequence current direction at the upstream of the grounded point is that the line flows to a bus, and the zero-sequence current at the downstream of the grounded point is that the bus flows to the line. Therefore, in a system with no grounding at a neutral point, when a line is grounded, the direction of zero voltage mutation and zero sequence current of the line detected by the terminal equipment is the line flow direction bus, the grounding is the boundary grounding, and if the direction of zero voltage mutation and zero sequence current of the line detected by the terminal equipment is the bus flow direction line, the grounding fault is the boundary fault.
In a distribution line, for a neutral point arc suppression coil grounding system, when a single-phase grounding fault occurs on a line, the zero sequence voltage on the line changes suddenly, the zero sequence active power of the line at the upstream of a grounding point is negative, and the zero sequence active power of the line at the downstream of the grounding point is positive. Therefore, in the system with the neutral point grounded through the arc suppression coil, when the line has a ground fault, the terminal equipment detects that the line has zero-voltage sudden change and the zero-sequence active power is negative, the ground fault is the internal grounding, and if the terminal equipment detects that the line has zero-voltage sudden change and the zero-sequence active power is positive, the ground fault is the external fault.
In a distribution line, when a neutral point is grounded through a small resistor, zero sequence voltage on the line changes suddenly when the line fails, zero sequence active power of the line at the upstream of the grounding point is negative, and zero sequence active power of the line at the downstream of the grounding point is positive. Therefore, in a system in which a neutral point is grounded through a small resistor, when a line has a ground fault, the terminal equipment detects that the line has a zero-voltage sudden change and the zero-sequence active power is negative, the ground fault is an internal-boundary ground, and if the terminal equipment detects that the line has the zero-voltage sudden change and the zero-sequence active power is positive, the ground fault is an external-boundary fault.
The processing embodiment is shown in fig. 9 to fig. 13 (1) a permanent earth fault occurs between FS2 and FS3, and the terminal equipment on the line detects a zero-voltage sudden change and starts zero-sequence active power integral calculation and zero-sequence current direction monitoring; (2) after the terminal completes the integral calculation of the zero sequence active power, the unit type terminal sends the calculated zero sequence active power and the monitored information of the zero sequence current direction to the regional type terminal; (3) after receiving the information from the unit type terminal, the area type terminal FS1 positions the fault between the switch FS2 and the switch FS3 by combining the fault information detected by the area type terminal FS1, then sends the information located in the fault area to the switches FS2 and FS3, and after receiving the information, the switches FS2 and FS3 are switched off and then switched on in a locked mode; (4) after the switch FS2 and the switch FS3 are locked and closed, the fault is successfully isolated, and then information that the switch is locked and closed and the fault is isolated is sent to the regional terminal FS 1; (5) the zone type terminal FS1 receives information that the fault has been isolated, which is sent by the switches FS2 and FS3 on both sides of the fault. The regional terminal FS1 issues the information that the fault is cleared and can be communicated to the communication switch LSW1, and the communication switch is communicated to recover the power supply of the non-fault region.
Example 3:
the technical principle of fault judgment of a broken line fault processing mode is as follows: as insulated conductor applications increase, ground faults and short circuit faults have a smaller and smaller percentage of distribution line faults, and disconnection faults have a larger and larger percentage. In the distribution line, single-phase line breaks can be divided into three types: the first is that the breakpoint is not grounded; the second is the grounding of the breakpoint power supply side; the third is the breakpoint load side grounding. When a breakpoint ungrounded disconnection fault occurs, the three-phase voltage at the upstream of the breakpoint is still in a balanced state, the three line voltages are not changed, but the current of the fault phase of the fault loop is reduced, the reduction degree of the current of the fault phase of the fault loop is related to the position of the disconnection fault, the closer the position of the fault phase to the transformer substation is, the more the reduction is, and the included angle of the non-fault phase current is increased. The three-phase voltage at the downstream of the breakpoint begins to be unbalanced, the fault phase voltage is reduced, two of the three line voltages are reduced to 0.8 time of rated line voltage, and one of the three line voltages is kept above 90%. When the breakpoint is close to the load side ground disconnection fault, the three line voltages at the upstream of the breakpoint are kept unchanged, the current of the fault phase of the fault loop is reduced, the reduction degree of the current of the fault phase of the fault loop is related to the position of the disconnection fault, the closer the position of the fault phase to the transformer substation, the more the reduction is, the larger the non-fault phase current included angle is, and the high-resistance grounding characteristic can be presented at the upstream of the breakpoint. The three-phase voltage downstream of the breakpoint begins to be unbalanced, the fault phase voltage is reduced, two of the three line voltages are reduced to 0.8 time of rated line voltage, and one of the three line voltages is kept above 90%.
When the breakpoint is close to the power supply side ground disconnection fault, the upstream of the breakpoint presents single-phase ground fault characteristics, the current of the fault phase of the fault loop can be reduced, the reduction degree of the current of the fault phase of the fault loop is related to the position of the disconnection fault, the closer the position of the fault phase to the transformer substation, the more the reduction is, the larger the non-fault phase current included angle can be, and the three line voltages can be kept unchanged. The three-phase voltage downstream of the breakpoint begins to be unbalanced, the fault phase voltage is reduced, two of the three line voltages are reduced to 0.8 time of rated line voltage, and one of the three line voltages is kept above 90%. In the distribution line, two phase broken lines can also be divided into three types: the first is that the breakpoint is not grounded; the second is the grounding of the breakpoint power supply side; the third is the breakpoint load side grounding.
When two phases of lines break, but the lines are not grounded after the lines break, the three line voltages at the upstream of the break point are kept unchanged, the three phase currents are simultaneously reduced, the included angle of the three phase currents is still 120 degrees, at the downstream of the break point, the three phase voltages are reduced, the phases are the same, the three line voltages are 0, and the zero sequence voltage is larger.
When the load side of the two-phase broken line is grounded, the front end of the broken line presents the characteristic of single-phase high-resistance grounding fault, three phase currents are reduced simultaneously, three-phase voltages at the downstream of the broken line are reduced, the phases are the same, three line voltages are 0, and the three line voltages have larger zero-sequence voltages.
When the two-phase broken line power supply side is grounded, the front end of the broken point presents two-phase short circuit characteristics. And at the downstream of the breakpoint, the three-phase voltage is reduced, the phases are the same, the three line voltages are 0, and the three line voltages have larger zero-sequence voltage.
The processing examples are shown in fig. 14 to 18, (1) an a-phase disconnection fault occurs between FS2 and FS 3; (2) monitoring that the phase current of the phase A is reduced and the included angle of the phase current of the phase B and the phase current of the phase C is increased by equipment at the upstream of the disconnection point; monitoring that the voltage of the phase A is reduced by downstream equipment of a disconnection point, reducing the line voltages between the phase A and the phase C and between the phase A and the phase B to be 0.5 times of rated line voltage, keeping the phase B and the phase C unchanged, and uploading detected information to a regional terminal by a unit type terminal; (3) after receiving the information from the unit type terminal, the area type terminal FS1 positions the fault between the switch FS2 and the switch FS3 by combining the fault information detected by the area type terminal FS1, then sends the information located in the fault area to the switches FS2 and FS3, and after receiving the information, the switches FS2 and FS3 are switched off and then switched on in a locked mode; (4) after the switch FS2 and the switch FS3 are locked and closed, the fault is successfully isolated, and then information that the switch is locked and closed and the fault is isolated is sent to the regional terminal FS 1; (5) the zone type terminal FS1 receives information that the fault has been isolated, which is sent by the switches FS2 and FS3 on both sides of the fault. The regional terminal FS1 issues the information that the fault is cleared and can be communicated to the communication switch LSW1, and the communication switch is communicated to recover the power supply of the non-fault region.
Example 4:
the distributed power supply management adopts the processing technical principle that a traditional power distribution network is a passive network which distributes power to users and enables the power to flow in a single direction, and the access of the distributed power supply enables the power distribution network to be an active network which enables the power to flow in a double direction, and meanwhile, the problems of voltage fluctuation, relay protection misoperation or refusal operation and the like are also brought.
According to the superposition theorem, when a line connected to the distributed power supply fails, the short-circuit current flowing to a fault point can be regarded as the superposition of the short-circuit current of the distributed power supply and the short-circuit current of the transformer substation at the short-circuit point. If the fault point is located in the middle of the topological positions of the transformer substation and the distributed power supply, the directions of fault currents detected by terminal equipment between the fault point and two power supply points are opposite, namely the directions of the fault currents on two sides of the fault point are opposite, and no fault current can be detected in a fault area. If the fault point is on the same side of the topological positions of the transformer substation and the distributed power supply, the directions of fault currents detected by terminal equipment from the fault point to the two power supply points are the same, and the fault current cannot be detected in a fault area.
The processing embodiments are shown in fig. 19 to fig. 24, (1) a permanent fault occurs between FS1 and FS2, and fault currents are detected by outlet switches CB, FS1, FS4 and FS5 of a substation; (2) since there is no step difference, FS1, FS4, and FS5, the CB switch detects the fault trip and sends information on the detected fault to the zone type terminal FS1, and then the switches of FS2 and FS3 detect the line loss voltage while sending information on the detected line loss voltage to the zone type terminal FS 1. The interconnection switch LSW1 sends information that the single-side voltage loss is detected to the area type terminal FS 1; (3) after receiving the information from the unit type terminal, the area type terminal FS1 combines the detected fault information to position the fault between the switch FS1 and the switches FS2 and FS4, the switch FS1 locks in the forward direction and sends the information located in the fault area to the switch FS2 and the switch FS4, after the switches FS2 and FS4 receive the information, the switch FS4 locks and closes in the reverse direction, and the switch FS2 opens and then locks and closes in the reverse direction; (4) after the switch FS2 and the switch FS4 are locked and closed, the fault is successfully isolated, and then information that the switch is locked and closed and the fault is isolated is sent to the regional terminal FS 1; (5) the regional terminal FS1 receives the information that the fault is isolated and sent by the switches FS2 and FS4 on the two sides of the fault; the regional terminal FS1 judges that the FS5 can be switched on to recover power supply of a non-fault region, issues fault-isolated information to the FS5, can recover the power supply information of the non-fault region, and switches on after the FS5 receives the information; the regional terminal FS1 issues information that the fault is isolated and can be communicated for switching to supply to the communication switch LSW1, and the communication switch is switched to supply; (6) and outgoing switches CB and FS5 of the substation are overlapped, and the power supply is recovered in a non-fault area of the line.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A fault processing method based on a 5G communication module distribution line is characterized by comprising the following steps: the system comprises a power distribution main station, terminal equipment, a 5G network communication module and a line tower, wherein the terminal equipment comprises an area type terminal used for being in charge of edge calculation and a unit type terminal used for monitoring the running condition of a line in real time, the area type terminal is installed on the line tower, the unit type terminal is installed on the line tower, the power distribution main station, the area type terminal and the unit type terminal are all provided with the 5G network communication module, the power distribution main station is in wireless connection with the area type terminal through the 5G network communication module, and the area type terminal is in wireless connection with the unit type terminal through the 5G network communication module;
the line topology self-recognition method of the fault processing method comprises the following steps: when the unit type terminal is powered on, the position information of the tower where the unit type terminal is located is registered to the area type terminal for edge calculation, the area type terminal for edge calculation synchronizes the registration information of all the unit type terminals to all the unit type terminals of the line at intervals, and each terminal device of the line knows the positions of all the terminal devices;
if the equipment is in the running state for a long time, registering once at intervals; the regional terminal performing edge calculation synchronizes the registration information of all terminals to the unit type terminal at intervals;
if the line running state has problems, the regional terminal immediately takes corresponding measures according to the corresponding problems, informs the unit type terminal on the line to take corresponding reactions, and reports the final processing result to the power distribution main station.
2. The fault handling method of the distribution line based on the 5G communication module of claim 1, wherein the fault handling method comprises the following steps: after the line is newly installed and disassembled, the terminal equipment on the line can automatically update the data information of the topological structure, wherein the data information comprises the position of a tower, the equipment number and the IP information of the Internet of things card.
3. The fault handling method of the distribution line based on the 5G communication module of claim 1, wherein the fault handling method comprises the following steps: the method comprises a short-circuit fault processing method, a ground fault processing method, a disconnection fault processing method, a distributed power supply management fault processing method, a power distribution network line management fault processing method, a communication abnormal fault processing method and a switch bounce fault processing method.
4. The fault handling method of the distribution line based on the 5G communication module of claim 3, wherein the fault handling method comprises the following steps: the method for processing the short-circuit fault comprises the following steps:
when a fault occurs, the terminal equipment at the upstream of the fault detects the fault, if the level difference coordination exists between the protections of the line switches, the switch at the upstream of the fault, which is closest to the fault point, trips to quickly remove the fault, and if the level difference coordination does not exist between the protections of the line switches, all the switches at the upstream of the fault trip to quickly remove the fault; when the fault is removed, the downstream terminal equipment of the fault can detect that the line is in a voltage loss state;
when the unit type terminal equipment at the upstream of the fault detects the short-circuit current, the information of the detected fault is uploaded to the area type terminal; when the terminal equipment at the downstream of the fault detects that the line is in a voltage loss state, the information of the detected line voltage loss is uploaded to the regional terminal;
after detecting and receiving the information of line fault or line voltage loss, the area type terminal waits for other unit type terminals to continuously send information, and starts to judge the fault area after the condition for judging the fault area is met;
after the fault location of the area type terminal is completed, the unit type terminals at two ends of a fault point receive the fault location information of the area type terminal, the fault is processed according to the received information by combining the information detected by the unit type terminals and the opening and closing position of the switch, if the fault is an overcurrent fault, the switch is judged to be in a closing state or an opening state, if the fault is in the closing state, the switch is controlled to be opened, the switch is closed by forward locking, the upper stream fault isolation of the fault point is confirmed to be successful, if the fault is in the opening state, the switch is closed by forward locking, and the upper stream fault isolation of the fault point is confirmed to be successful; if the line is in voltage loss, judging whether the switch is in a switching-on state or a switching-off state, if the switch is in the switching-on state, controlling the switch to switch off, reversely locking and switching on, and confirming that the downstream fault isolation of a fault point is successful; if the fault point is in the switching-off state, the switching-on state is locked in the reverse direction, and the downstream fault isolation of the fault point is confirmed to be successful;
if the area type terminal is positioned at a certain end of a fault point, whether overcurrent fault or line voltage loss is detected by the area type terminal is judged, if the overcurrent fault exists, whether the switch is in a switching-on state or a switching-off state is judged, if the switching-on state exists, the switch is controlled to be switched off, the switch is switched on in a forward locking mode, the upstream fault isolation of the fault point is confirmed to be successful, and if the switching-off state exists, the switch is switched on in the forward locking mode, and the upstream fault isolation of the fault point is confirmed to be successful; if the line is in voltage loss, judging whether the switch is in a switching-on state or a switching-off state, if the switch is in the switching-on state, controlling the switch to switch off, reversely locking and switching on, and confirming that the downstream fault isolation of a fault point is successful; if the fault point is in the switching-off state, the switching-on state is locked in the reverse direction, and the downstream fault isolation of the fault point is confirmed to be successful;
after the regional terminal receives the information of reverse blocking of the downstream terminal equipment of the fault point, the regional terminal notifies the contact switch with contact transfer condition behind the terminal equipment of reverse blocking of the information that the fault is isolated, and the contact switch starts contact transfer after receiving the information of fault isolation.
5. The fault handling method of the distribution line based on the 5G communication module of claim 3, wherein the fault handling method comprises the following steps: the processing method of the ground fault comprises the following steps: when terminal equipment on a line detects zero-voltage sudden change, zero-sequence active power integral calculation is started, the integral time is 5 cycles, and the direction of zero-sequence current is monitored; after the zero sequence active power integration is completed, the unit type terminal simultaneously sends the calculated zero sequence power and the monitored zero sequence current direction to the area type terminal, after the area type terminal collects the information of the unit type terminal, the area type terminal starts to judge a fault area according to the difference of fault characteristic quantities detected by terminal equipment before and after a fault line fault point, then the area type terminal enables the terminal equipment positioned at two sides of the fault to be switched off and switched on in a locking mode, the information of switching off and switching on in the locking mode is sent to the area type terminal, and after the area type terminal confirms that the fault area is successfully isolated, if a contact switching condition exists in a downstream line of a grounding point, the area type terminal informs the contact switch to be switched on for switching.
6. The fault handling method of the distribution line based on the 5G communication module of claim 3, wherein the fault handling method comprises the following steps: the method for processing the disconnection fault comprises a single-phase disconnection fault judgment method and a two-phase disconnection fault judgment method: the single-phase disconnection fault judgment method comprises the following steps: after a single-phase disconnection fault occurs, the fault characteristics monitored by the upstream equipment at the disconnection point are as follows: the phase current of the fault phase can be reduced, and the included angle of the phase current of the non-fault phase can be increased; the fault characteristics monitored by downstream equipment at the disconnection point are as follows: the voltage of a fault phase is reduced, two of the three line voltages are reduced to 0.8 time of rated line voltage, and one of the three line voltages is larger than 90% of the rated line voltage; when two devices connected in topology respectively monitor the fault characteristics of the upper and lower streams of a single-phase disconnection point, disconnection faults occur between the two devices;
the two-phase disconnection fault judgment method comprises the following steps: after a two-phase disconnection fault occurs, the fault characteristics monitored by the upstream equipment at the disconnection point are as follows: the three-phase current is reduced or the two-phase current is increased; the fault characteristics monitored by downstream equipment at the disconnection point are as follows: the three-phase voltage is reduced, the phases are the same, and the line voltage is reduced to zero; when two devices connected in topology respectively monitor the fault characteristics of the upper and lower streams of the two-phase disconnection point, the disconnection fault occurs between the two devices;
after the fault section is confirmed, the regional terminal sends information for judging the fault region to the terminal equipment at two ends of the fault, and after the terminal equipment at two ends of the fault receives the information, the terminal equipment starts to switch off and is locked and switched on, and the fault is removed; then the terminal equipment on both sides of the fault sends information that the fault is isolated to the regional terminal, the regional terminal judges whether the non-fault region at the downstream of the disconnection point needs to be communicated and supplied or not and has no condition of being communicated and supplied, if the non-fault region needs to be communicated and has the condition of being communicated and supplied, the regional terminal sends information of being communicated and supplied to the corresponding communication switch, and the communication switch is communicated and supplied after receiving the information.
7. The fault handling method of the distribution line based on the 5G communication module of claim 3, wherein the fault handling method comprises the following steps: the processing method of the distributed power management fault comprises the following steps:
on a line with a distributed power supply, when a short-circuit fault occurs, fault current flowing into a fault point is superposition of fault currents of two power supply points of a transformer substation and the distributed power supply, when the fault occurs in the middle of topological positions of the transformer substation and the distributed power supply, the directions of the fault currents from the fault point to the two power supply points are opposite, fault current cannot be detected by terminal equipment of a non-fault loop, and a fault area is located between two terminal equipment which are connected in a topological structure and detect opposite fault currents; when a fault occurs at the same side of the topological positions of the transformer substation and the distributed power supply, the directions of fault currents detected by terminal equipment on a fault loop are consistent, and a fault area is located between two terminals which are connected with the topological structure, detect the fault currents and do not detect the fault currents;
when a line has a fault, the terminal equipment of a fault loop detects the fault, the switch protects the opening and sends the information of the detected short-circuit current and the detected short-circuit current direction to the area type terminal, and the terminal of a non-fault loop sends the information of the detected line voltage loss to the area type terminal; the regional terminal judges and sends information of the fault region to the terminals at two sides of the fault, the terminals at two sides of the fault receive the information of the fault region and then judge the opening and closing information of the switch, if the terminals are in the opening position, the switch is opened and closed, if the terminals are in the opening position, the switch is closed directly, and the information of the closed and closed state is sent to the regional terminal; the regional terminal confirms the fault isolation condition according to the received locking and closing information, and when the terminals on two sides of the fault are both opened and closed, the fault isolation is completed; and the area type terminal sends information of successful fault isolation to the terminals which are not positioned at the two sides of the fault area and the contact switch, and the terminals which are not positioned at the two sides of the fault area and the terminals with contact transfer conditions start to recover the power supply of the non-fault area.
8. The fault handling method of the distribution line based on the 5G communication module of claim 3, wherein the fault handling method comprises the following steps: the fault processing method for the power distribution network line management comprises the following steps: the unit type terminal can timely send the monitored voltage and current information to the regional type terminal, the opening and closing information of a switch of the unit type terminal can also be uploaded to the regional type terminal, and when the regional type terminal receives that the voltage and the current sent by a certain unit type terminal are abnormal and other terminals do not find the abnormality, the operation fault of a voltage or current sensor of the switch is indicated, the voltage or current sensor needs to be overhauled and replaced, and a responsible person of a circuit is informed;
if the regional terminal frequently receives the switching-on and switching-off information of a certain unit type terminal, the fact that the unit type terminal or a corresponding switch body has a fault and needs to be maintained or replaced is proved, and a circuit responsible person is informed;
if the regional terminal and a certain unit type terminal are frequently broken and the information of the unit type terminal cannot be received, on the premise of eliminating signal factors, the unit type terminal can be considered to have a fault, needs to be repaired and replaced, and informs line responsible personnel.
9. The fault handling method of the distribution line based on the 5G communication module of claim 3, wherein the fault handling method comprises the following steps: the method for processing the communication abnormal fault comprises a unit type terminal communication abnormality and a regional type terminal communication abnormality;
the unit type terminal communication abnormity processing method comprises the following steps: when no abnormal line operation occurs, the regional terminal sends heartbeat packets to the unit type terminals at regular time, if the reply of one unit type terminal cannot be received within a certain time, the unit type terminal is considered to be abnormal in communication, and abnormal information is reported to the power distribution master station;
when the line operation is abnormal, if the heartbeat reply of a certain unit type terminal of the line and the fault information sent by the fault cannot be received within a determined time, the unit type terminal is considered to be abnormal in communication, if the switch is positioned in a fault area at the upstream of the fault, the regional type terminal enables a switch at the upper stage of the regional type terminal to be switched off and is switched on in a forward locking way, and if the switch is positioned at the upstream of the fault but is not positioned in the fault area, the switch is ignored in the processing process; if the switch is located in a fault area at the downstream of the fault, the regional terminal enables the switch at the next stage to be switched off and reversely locked and switched on, and if the switch is located at the downstream of the fault but is not located in the fault area, the switch is ignored in the processing process; if the contact switch is used, the contact is not related to the contact switch.
10. The fault handling method of the distribution line based on the 5G communication module of claim 3, wherein the fault handling method comprises the following steps: the method for processing the communication exception of the regional terminal comprises the following steps: setting a regional terminal priority, when a line normally runs, if a unit type terminal cannot receive a heartbeat packet or replies heartbeat failure, sending information to a terminal at a second priority, automatically converting a role of the second priority terminal into a regional terminal after the second priority terminal cannot receive the heartbeat packet or replies heartbeat failure or receives information of other unit type terminals, treating the previous regional terminal as the unit type terminal, starting to execute calculation at the same time, and reporting information of abnormal communication to a power distribution master station;
when the line operation has a fault, if the unit type terminal cannot receive the heartbeat packet, reply the heartbeat or fail to send the fault information, the information can be sent to the terminal at the second priority level, and after the terminal at the second priority level cannot receive the heartbeat packet, reply the heartbeat failure, fail to send the fault information or receive the information of other unit type terminals, the automatic role conversion is carried out to the area type terminal, the calculation is carried out, the fault isolation is carried out and the power supply of the non-fault area is recovered according to the established strategy.
CN202110425205.4A 2021-04-20 2021-04-20 Fault processing method based on 5G communication module distribution line Pending CN113013880A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110425205.4A CN113013880A (en) 2021-04-20 2021-04-20 Fault processing method based on 5G communication module distribution line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110425205.4A CN113013880A (en) 2021-04-20 2021-04-20 Fault processing method based on 5G communication module distribution line

Publications (1)

Publication Number Publication Date
CN113013880A true CN113013880A (en) 2021-06-22

Family

ID=76389013

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110425205.4A Pending CN113013880A (en) 2021-04-20 2021-04-20 Fault processing method based on 5G communication module distribution line

Country Status (1)

Country Link
CN (1) CN113013880A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113690865A (en) * 2021-10-26 2021-11-23 国网江西省电力有限公司电力科学研究院 Quick handling method for single-phase disconnection fault of 10kV line
CN114325238A (en) * 2021-12-30 2022-04-12 上海尤比酷电气有限公司 Low-voltage distribution line fault positioning method and system
CN115308528A (en) * 2022-08-05 2022-11-08 中宝电气有限公司 Intelligent feeder terminal capable of accurately positioning single-phase earth fault based on Internet of things technology
CN115825655A (en) * 2023-02-20 2023-03-21 国网山东省电力公司乳山市供电公司 System and method for rapidly monitoring and positioning single-phase earth fault of distribution network

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102565572A (en) * 2011-12-04 2012-07-11 江苏省电力公司南京供电公司 Platform and method for judging fault of match power grid
CN103474980A (en) * 2013-09-02 2013-12-25 昆明理工大学 Transient-power-direction-based single-phase grounding protection method for power distribution network
CN104360228A (en) * 2014-11-07 2015-02-18 华北电力大学 Method for improving positioning of fault section of power distribution network including distributed power supply through directional elements
CN104539055A (en) * 2015-01-07 2015-04-22 山东鲁能智能技术有限公司 Electric system key equipment actualizing-one-prepared method and system based on network
CN108776283A (en) * 2018-04-04 2018-11-09 国家电网公司 A kind of CT not exclusively lower power distribution network single-phase disconnection fault judgment method of configuration with judge system
CN109040295A (en) * 2018-08-30 2018-12-18 上海九山电子科技有限公司 Determination method and device, terminal and the storage medium of abnormal broken line
CN109713794A (en) * 2018-12-28 2019-05-03 广东电网有限责任公司 A kind of distributed intelligence self recoverable system and method
CN110797978A (en) * 2019-10-31 2020-02-14 国网河北省电力有限公司电力科学研究院 Intelligent station terminal with edge computing capability and fault judgment method
CN110808576A (en) * 2019-11-15 2020-02-18 广州供电局有限公司 Intelligent distributed single-phase earth fault isolation method suitable for small-current earth system
CN112421629A (en) * 2020-11-27 2021-02-26 广东电网有限责任公司佛山供电局 Self-adaptive distributed feeder automation fault processing method

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102565572A (en) * 2011-12-04 2012-07-11 江苏省电力公司南京供电公司 Platform and method for judging fault of match power grid
CN103474980A (en) * 2013-09-02 2013-12-25 昆明理工大学 Transient-power-direction-based single-phase grounding protection method for power distribution network
CN104360228A (en) * 2014-11-07 2015-02-18 华北电力大学 Method for improving positioning of fault section of power distribution network including distributed power supply through directional elements
CN104539055A (en) * 2015-01-07 2015-04-22 山东鲁能智能技术有限公司 Electric system key equipment actualizing-one-prepared method and system based on network
CN108776283A (en) * 2018-04-04 2018-11-09 国家电网公司 A kind of CT not exclusively lower power distribution network single-phase disconnection fault judgment method of configuration with judge system
CN109040295A (en) * 2018-08-30 2018-12-18 上海九山电子科技有限公司 Determination method and device, terminal and the storage medium of abnormal broken line
CN109713794A (en) * 2018-12-28 2019-05-03 广东电网有限责任公司 A kind of distributed intelligence self recoverable system and method
CN110797978A (en) * 2019-10-31 2020-02-14 国网河北省电力有限公司电力科学研究院 Intelligent station terminal with edge computing capability and fault judgment method
CN110808576A (en) * 2019-11-15 2020-02-18 广州供电局有限公司 Intelligent distributed single-phase earth fault isolation method suitable for small-current earth system
CN112421629A (en) * 2020-11-27 2021-02-26 广东电网有限责任公司佛山供电局 Self-adaptive distributed feeder automation fault processing method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
封士永;蔡月明;刘明祥;丁孝华;刘润苗;嵇文路;: "考虑单相接地故障处理的自适应重合式馈线自动化方法", 电力系统自动化, no. 03, 10 February 2018 (2018-02-10) *
杨涌新;: "分析分布智能型馈线自动化实现10 kV电缆故障快速复电技术", 中国新技术新产品, no. 13, 10 July 2020 (2020-07-10), pages 70 - 72 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113690865A (en) * 2021-10-26 2021-11-23 国网江西省电力有限公司电力科学研究院 Quick handling method for single-phase disconnection fault of 10kV line
CN114325238A (en) * 2021-12-30 2022-04-12 上海尤比酷电气有限公司 Low-voltage distribution line fault positioning method and system
CN114325238B (en) * 2021-12-30 2023-12-15 上海尤比酷电气有限公司 Low-voltage distribution line fault positioning method and system
CN115308528A (en) * 2022-08-05 2022-11-08 中宝电气有限公司 Intelligent feeder terminal capable of accurately positioning single-phase earth fault based on Internet of things technology
CN115308528B (en) * 2022-08-05 2023-09-22 中宝电气有限公司 Intelligent feeder terminal for accurately positioning single-phase ground fault based on Internet of things technology
CN115825655A (en) * 2023-02-20 2023-03-21 国网山东省电力公司乳山市供电公司 System and method for rapidly monitoring and positioning single-phase earth fault of distribution network
CN115825655B (en) * 2023-02-20 2023-06-16 国网山东省电力公司乳山市供电公司 Distribution network single-phase grounding fault rapid monitoring and positioning system and method

Similar Documents

Publication Publication Date Title
CN109193582B (en) Intelligent power distribution network area protection control system and control method
US11355961B2 (en) Method and system for fast reconfiguration of power supply network in tens of milliseconos after power grid failure
CN113013880A (en) Fault processing method based on 5G communication module distribution line
CN102037630B (en) Feeder automation system and method for operating the same
CN109713794B (en) Distributed intelligent self-recovery system and method
CN111786364B (en) Distributed-based complex power distribution network fault rapid self-healing control method and system
CN107069676A (en) Power distribution network fault positioning and rapid isolation recovery control method
CN110233478B (en) Method and system for quickly reconstructing millisecond-level power supply network after power grid fault
CN107433883B (en) Railway traction power supply arm integrated monitoring system
CN101409442A (en) Rapid line backup protection method with reliable selection based on wide area measuring system
CN112165090A (en) Cooperative self-healing system and method
CN110808576B (en) Intelligent distributed single-phase earth fault isolation method suitable for small-current grounding system
CN109449895B (en) Distributed self-healing control method suitable for breaker load switch hybrid power distribution network
CN108092248A (en) A kind of intelligent distributed feeder line fault of distribution network quickly cuts off shielding system and its method
US11489365B2 (en) Non-three-phase fault isolation and restoration systems
Cerretti et al. Upgrade of ENEL MV network automation to improve performances in presence of faults and to deal DG
CN106329492B (en) A kind of simple bus bar protecting method based on system topological
CN110912092A (en) 3-66 kV line disconnection protection method for comparing line voltages on two sides of line
CN111817353B (en) Power distribution network equipment fault processing method
CN202550668U (en) Distributed power distribution network management terminal
CN114744765A (en) Self-healing method for distribution line fault
CN210780224U (en) Distribution network fault self-healing device
CN113629672A (en) Method and device for rapidly and intelligently isolating faults of power distribution network in zero second after overcurrent
CN112072622A (en) Network type protection multi-point fault processing method
CN112271711A (en) Distributed fault protection method and device for transformer substation

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination