CN116111587A - Method for quickly self-healing line faults of secondary trunk distribution network - Google Patents
Method for quickly self-healing line faults of secondary trunk distribution network Download PDFInfo
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- CN116111587A CN116111587A CN202310087379.3A CN202310087379A CN116111587A CN 116111587 A CN116111587 A CN 116111587A CN 202310087379 A CN202310087379 A CN 202310087379A CN 116111587 A CN116111587 A CN 116111587A
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- 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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/24—Circuit arrangements for boards or switchyards
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- 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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention provides a quick self-healing method for line faults of a secondary trunk distribution network, which is based on a power grid structure comprising a main network, a branch network and a distribution automation device which are connected with each other, wherein the main network is a double-petal main network, and the branch network is a double-ring network consisting of four distribution chambers and comprising two branch loops; the line faults in the normal running state and the maintenance state in practical application account for more than 90% of the total faults of the power grid structure, and the self-healing method is provided by combining the fault occurrence points based on the two states, is reliable, quick and effective, and is worthy of popularization and application.
Description
The invention is as follows: 2019114118637 name: a set of power distribution network rapid self-healing method application days: division of the application at 12 and 31 in 2019.
Technical Field
The invention relates to a quick self-healing method for line faults of a secondary trunk distribution network.
Background
The power distribution network frame structure with the main network of double petals and the branch network of double ring networks is a high-reliability power grid structure, and has clear structure and good self-healing capacity. The power grid structure comprises a main network, a branch network and a power distribution automation device which are connected with each other, wherein the main network is a double-petal main network, the branch network is a double-ring network which consists of four power distribution chambers and comprises two branch loops, the number of first-stage power distribution chambers in the four power distribution chambers is two, the number of second-stage power distribution chambers is two, the two branch loops have the same structure and are respectively a first branch loop and a second branch loop, the endpoints of the two branch loops at the side of each first-stage power distribution chamber are correspondingly connected with two sections of buses of a switch station in the main network one by one, and the two second-stage power distribution chambers are connected through a communication cable and run in an open loop; the power distribution automation device adopts an intelligent distributed feeder automation technology. The power is supplied by the switch station, the public distribution room is used as a key node, and the whole cable construction is adopted, so that a high-reliability branch network double-ring network wiring structure is formed.
The common distribution automation rapid self-healing scheme is usually in the form of an intelligent distributed DTU device of a switching station feeder line overcurrent protection plus a public distribution room. The feeder line of the switching station adopts overcurrent protection as main protection; each section of bus of the public power distribution room is provided with 1 intelligent distributed DTU device.
DTU (Distribution Terminal Unit) is a terminal device of a switching station and a ring main unit, and is generally installed at a conventional switching station (station), an outdoor small-sized switching station, a ring main unit, a small-sized transformer station, a box-type transformer station and the like to collect and calculate position signals, voltages, currents, active power, reactive power, power factors, electric energy and other data of the switching device, perform opening and closing operation on the switch, and realize fault identification, isolation and recovery power supply of a feeder switch in a non-fault interval. The part of DTU also has the functions of protection and automatic switching of standby power supply; the device has the functions of line light difference protection, bus differential protection, self-healing control function, overcurrent protection, zero sequence overcurrent protection, backup protection, failure protection and the like.
The range for realizing the distributed feeder automation is between the first-stage public distribution room incoming line switches at the two ends of the double-ring network. The 10kV bus sectionalizer of each public power distribution room does not participate in the automatic and rapid self-healing process of power distribution.
Disclosure of Invention
Based on the network structure in the background technology, the invention aims to solve the typical and most common line faults and provides a quick and reliable method for self-healing of a power grid.
In order to solve the technical problems, the technical scheme adopted by the invention is that the method comprises the following steps:
s100: determining a distribution room or a switching station where a fault point is located according to the DTU fault alarm signal;
s200: determining a line with a fault;
s300: determining a loop in which a line with a fault is located;
s400: determining the running state of the power grid;
s500: determining a switch connected with the fault line; and comprehensively researching and judging a self-healing strategy, selecting a switch needing to be opened from the switches connected with the fault line, opening the switch, determining whether a contact cable switch of a loop is required to be closed, and operating.
A further improvement is a trunk line fault between the first loop switching stations, said S500 employing the steps of: at the moment, a first loop first switching station main line outlet switch and a first loop second switching station main line inlet switch are connected with a fault line; comprehensively judging, namely opening a main line outlet switch of a first switching station of the first loop; switching off the inlet switch of the main line of the first loop second switching station; and in the switching station with double petal operation, the first loop interconnection cable switch is in a closing state and is not processed.
A further improvement is that the feeder line of one of the switchyard of the first loop fails, said S500 taking the steps of: the first loop switch station feed-out line outlet switch is connected with a fault line; comprehensively judging, namely opening a feed-out line switch of the first loop switch station; and the switching station with double petals operates, and the interconnecting cable switch is in a closing state and does not process.
A further improvement is that the bus line of the second switching station of the first loop fails, and the step S500 includes the following steps: all the feed-out line switches on the bus of the first loop second switching station are connected with the bus of the first loop second switching station, and the main line feed-in switch of the first loop second switching station and the first loop interconnecting cable switch are connected with a fault cable; comprehensively judging, namely opening all the feed-out line switches on the buses of the second switch station of the first loop; switching off the inlet switch of the main line of the first loop second switching station; switching off the first loop interconnection cable switch; the sectional switch between bus sections of the second switch station of the first loop keeps a brake-separating state.
The further improvement is that after the self-healing of the bus of the second switching station of the first loop is completed, the bus of the third switching station of the first loop fails again, and the step S500 comprises the following steps: all the feed-out line switches on the bus of the first loop third switching station are connected with the bus of the first loop third switching station, and the main line feed-in switch of the first loop third switching station and the main line feed-out line switch of the first loop third switching station are connected with a fault cable; comprehensively researching and judging, and opening all the feed-out line switches on the bus of the third switching station of the first loop; switching off the line-in switch of the main line of the third switching station of the first loop; switching off a main line outlet switch of a third switching station of the first loop; the sectional switch between bus sections of the third switching station of the first loop keeps a switching-off state; the first loop fourth switch station main line inlet switch is automatically opened; the first loop interconnecting cable switch is automatically opened; the sectional switch between bus sections of the fourth switch station of the first loop is automatically switched on.
The further improvement is that the first-stage distribution room of the first loop has a line incoming fault during normal operation, and the step S500 comprises the following steps: at the moment, only a first-stage distribution room inlet switch of a first loop is connected with a fault line, and the switch is operated to be opened; the first loop contacts the cable switch to close.
A further improvement is that, in normal operation, a line fault occurs between the first-stage distribution room of the first loop and the second-stage distribution room of the first loop, and the step S500 includes the following steps: at the moment, the first-loop first-stage distribution room outlet switch and the first-loop second-stage distribution room inlet switch are connected with a fault line; comprehensively judging, namely opening an outlet switch of a first-stage distribution room of the first loop; switching off the inlet wire switch of the second-stage distribution room of the first loop; the first loop tie switch is closed.
The further improvement is that during normal operation, the bus line of the first-stage distribution room of the first loop fails, and the step S500 comprises the following steps: at the moment, the first-stage distribution room inlet switch of the first loop and the first-stage distribution room outlet switch of the first loop are connected with a fault line; comprehensively judging, and opening the inlet switch of the first-stage distribution room of the first loop; switching off the outlet switch of the first-stage distribution room of the first loop; the first loop tie switch is closed.
The further improvement lies in, when first loop first order electricity distribution room inlet wire overhauls, first loop first order electricity distribution room inlet wire trouble, S500 adopt the following step: at the moment, only the incoming line switch of the first-stage distribution room of the second loop is connected with the incoming line of the first-stage distribution room of the second loop; comprehensively judging, and opening the inlet switch of the first-stage distribution room of the second loop; the second loop tie switch is closed.
The further improvement is that when the incoming line of the first-stage distribution room of the second loop is overhauled, the line fault between the first-stage distribution room of the second loop and the second-stage distribution room of the second loop is avoided, and the step S500 comprises the following steps: at the moment, the outlet switch of the first-stage distribution room of the second loop and the inlet switch of the second-stage distribution room of the second loop are connected with a fault line; comprehensively judging, and opening the inlet switch of the first-stage distribution room of the second loop; switching off the outlet switch of the first-stage distribution room of the second loop; the second loop tie switch is closed.
The further improvement is that when the first-stage distribution room inlet wire of the first loop is overhauled, the bus line of the first-stage distribution room of the second loop is failed, and the step S500 comprises the following steps: at the moment, the incoming line switch of the first-stage distribution room of the second loop and the outgoing line switch of the first-stage distribution room of the second loop are connected with a fault line; comprehensively judging, and opening the inlet switch of the first-stage distribution room of the second loop; switching off the outlet switch of the first-stage distribution room of the second loop; the second loop tie switch is closed.
The further improvement is that when the first loop first-stage distribution room incoming line overhauls, the first loop second-stage distribution room bus line fails, and the step S500 adopts the following steps: at the moment, the first loop second-stage distribution room incoming line switch and the first loop second-stage distribution room outgoing line switch are connected with a fault line; comprehensively judging, namely opening the inlet wire switch of the second-stage distribution room of the first loop; and opening the outlet switch of the second-stage distribution room of the first loop.
The invention has the beneficial effects that:
the method divides the power grid into two states of normal operation and maintenance, subdivides the power grid according to the occurrence position of the fault occurrence point on the basis, and gives different solving steps according to each different situation, so that the self-healing process of the power grid is very quick and effective, and the method is safe, simple and reliable and is worthy of popularization and use.
Drawings
FIG. 1 is a schematic view of a composite grid structure according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a backbone loop and a protection range according to embodiment 1 of the present invention;
fig. 3 is a schematic diagram of a failure point of the backbone network according to embodiment 1 of the present invention;
FIG. 4 is a schematic diagram of a distribution automation intelligent distributed DTU configuration scheme according to embodiment 2 of the present invention;
FIG. 5 is a schematic diagram of a failure point of the branch network according to embodiment 2 of the present invention during normal operation;
FIG. 6 is a schematic diagram of failure points occurring during maintenance of the branch network according to embodiment 3 of the present invention;
in fig. 1: 1-1 first transformer substation, 1-2 second transformer substation, 2-1 first switching station, 2-2 second switching station, 2-3 third switching station, 2-4 fourth switching station, 3-1 first distribution room, 3-2 second distribution room, 3-3 third distribution room, 3-4 fourth distribution room.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
As shown in fig. 1, the method uses a composite grid structure based on reliable power supply, and the composite grid structure comprises a main network and branch network which are connected with each other, wherein the main network is a double-petal main network, the branch network is a double-ring network which consists of four distribution chambers and comprises two branch loops, the number of first-stage distribution chambers in the four distribution chambers is two, the number of second-stage distribution chambers in the four distribution chambers is two, the two branch loops have the same structure and are respectively a first branch loop and a second branch loop, the endpoints of the two branch loops at the side of each first-stage distribution chamber are correspondingly connected with two sections of buses of a switching station in the main network one by one, and the two second-stage distribution chambers are connected through a communication cable and operate in an open loop; the power distribution automation device adopts an intelligent distributed feeder automation technology; in the figure, the filled switches represent the combined bits, and the unfilled switches represent the divided bits. The bus is a horizontal trend line, and the feeder is a vertical trend line; the incoming line refers to a feeder line connected with the current-stage bus by the upper-stage bus, and the outgoing line refers to a feeder line connected with the lower-stage bus by the current-stage bus.
The embodiment of the invention adopts an intelligent distributed DTU device of a switching station feeder line overcurrent protection + 'public distribution room'. The range of realizing distributed feeder automation: and the first-stage public distribution room inlet wire switches at two ends of the double-ring network. The 10kV bus sectionalizer of each public power distribution room does not participate in the automatic and rapid self-healing process of power distribution. As shown in fig. 4.
The feeder line of the switch station adopts overcurrent protection as main protection; each section of bus of the public power distribution room is provided with 1 intelligent distributed DTU device, so that the acquisition and calculation of position signals, voltage, current, active power, reactive power, power factor, electric energy and other data of the switching equipment are completed, the switching-on and switching-off operation is carried out on the switch, and the fault identification, isolation and power restoration and supply of a feeder switch in a non-fault interval are realized. The device has the functions of line light difference protection, bus differential protection, self-healing control function, overcurrent protection, zero sequence overcurrent protection, backup protection, failure protection and the like.
In the branch network dual-ring network wiring, 8 intelligent distributed DTU devices are required to be configured in total, wherein 2 public power distribution rooms are configured in each public power distribution room.
The main network of the double petal type transformer substation consists of a first transformer substation 1-1, a second transformer substation 1-2 and first to fourth switch stations 2-1 to 2-4, two main loops are formed, the two main loops are respectively the first main loop and the second main loop, the first main loop consists of the same section bus of the first transformer substation 1-1 and the first section bus of the first to fourth switch stations 2-1 to 2-4, the second main loop consists of the same section bus of the second transformer substation 1-2 and the second section bus of the first to fourth switch stations 2-1 to 2-4, and the bus of the first transformer substation 1-1, the first section bus of the first switch station 2-1, the first section bus of the second switch station 2-2, the first section bus of the third switch station 2-3 and the first section bus of the fourth switch station 2-4 are sequentially connected in series through respective outgoing line breakers.
Example 1
As shown in fig. 2, the net frame structure of the main net is double petals, the incoming wires of each switch station are provided with light difference protection, the bus is independently provided with bus difference protection, the broken line in the figure is a first loop, and the thick solid line is a second loop; the protection scope is as the line in the block in the figure.
As shown in fig. 3, the fault point 1 occurs in the trunk line between the first loop 1 switching station and the first loop 2 switching station, the switch connected to the fault line has the trunk line outgoing switch S120 of the first loop 1 switching station and the trunk line incoming switch S210 of the first loop 2 switching station, the switch of the 1 switching station S120 is opened, the switch of the 2 switching station S210 is opened, and the fault processing is completed.
The fault point 2 occurs in the first loop 2 switchyard feed-out line, and the switch connected with the feed-out line is K211, so that the switch K211 is switched off, and the fault processing is completed.
The fault point 3 occurs in a bus of the first loop 2 switchyard, the switches connected with the bus are provided with first loop 2 switchyard feeder switches K211 to K216, a first loop 2 switchyard main line incoming switch S210 and a first loop 1 switchyard main line outgoing switch S120, so that the switches K211 to K216 are opened, the switches S210 and S120 are opened, the on-site spare power automatic switching is closed, and the fault processing is completed.
After the fault 3 is completely separated, the fault point 4 is positioned in a first loop 4 switchyard bus, and switches connected with the bus are provided with first loop 4 switchyard feeder switches K311 to K316, a trunk switch incoming line switch S310 and a trunk outgoing line switch S320, so that the S310 and S320 switches are separated, the K311 to K316 switches are separated, the on-site spare power automatic switching is blocked, and the fault processing is completed. At this time, the first loop 4 switching station detects that the bus is out of voltage, the system starts on-site spare power automatic switching, the first loop 4 switching station switching stations S410 and S420 trip, the first loop 4 switching station S400 closes the interconnection switch, and the non-fault area is recovered.
Example 2
In normal operation, the fault points 1, 2 and 3 are respectively different fault points occurring in 3 areas, as shown in fig. 5, the first-stage distribution room has an incoming line fault, the fault point 1 has a ground fault, and the DTUs of the distribution rooms of a-1#, a-2#, B-2#, and B-1# do not send action instructions to the switches because the fault points occur outside the automatic protection range of the distributed feeder. The 222 switch overcurrent section II of the switch station A is used for tripping after 0.3 second delay, and the section II bus of the A-1# and A-2# distribution room is out of voltage. The distributed feeder automation is logically judged (no fault signal exists in the interior, the buses of the distribution room lose voltage), the A-1# distribution room 202 is switched on, the B-2# distribution room 222 is switched on after the switching-on is successful, and the A-1# and A-2# distribution room II buses recover power supply.
The circuit fault between the first-stage distribution room and the second-stage distribution room, the ground fault occurs at the fault point 2, the distributed feeder line automatically detects fault signals, the fault point is positioned through logic judgment, the A-1# distribution room 222 switch and the A-2# distribution room 202 switch (the A-2# distribution room II section bus loses power) are separated, and after the fault is successfully isolated, the B-2# distribution room 222 switch is closed, and the A-2# distribution room II section bus recovers power supply. The switchyard feeder overcurrent protection returns due to the action time not being reached.
Distribution room busbar fault, fault point 3 takes place the earth fault (be located the II section busbar of A-1# distribution room), distributed feeder automation detects the fault signal, through logical judgement location fault point, all business turn over line switch (A-1 #, the power failure of the II section busbar of A-2# distribution room) on the II section busbar of A-1# distribution room of jump-out, after the successful isolation of fault: closing the switch of the B-2# distribution room 222, and recovering power supply of the section II bus of the A-2# distribution room; meanwhile, the A-1# distribution room starts 380V low-voltage automatic switching, and the low-voltage load carried by the section II bus of the A-1# distribution room resumes power supply.
Example 3
As shown in fig. 6, when the switch incoming cable of the a-1# distribution room 201 is overhauled, after manual operation by a person before overhauling: the 212 switch of the switch station A is in the split position; the switch of the A-1# distribution room 201 is in a split position; the B-2# distribution room 212 switch is in the closed position.
The first-stage distribution room has the incoming line fault, the fault point 1 is grounded, and the DTU of the A-1#, A-2#, B-1# distribution room can not detect the fault signal because the fault point is outside the automatic protection range of the distributed feeder, and the distribution room switch does not act. The 222 switch of the switch station A performs overcurrent II-section protection action, trips after 0.3 second delay, and the II-section bus of the A-1# and A-2# distribution room loses voltage. The distributed feeder automation is logically judged (no fault signal exists in the interior, the buses of the distribution room lose voltage), the A-1# distribution room 202 is switched on, the B-2# distribution room 222 is switched on after the switching-on is successful, and the A-1# and A-2# distribution room II buses recover power supply.
The circuit fault between the first-stage distribution room and the second-stage distribution room, the ground fault occurs at the fault point 2, the distributed feeder line automatically detects fault signals, the fault point is positioned through logic judgment, the A-1# distribution room 222 switch and the A-2# distribution room 202 switch (the A-2# distribution room II section bus loses power) are separated, and after the fault is successfully isolated, the B-2# distribution room 222 switch is closed, and the A-2# distribution room II section bus recovers power supply.
Distribution room busbar fault, fault point 3 takes place the earth fault (be located the II section busbar of A-1# distribution room), distributed feeder automation detects the fault signal, through logical judgement location fault point, all business turn over line switch (A-1 #, the power failure of the II section busbar of A-2# distribution room) on the II section busbar of A-1# distribution room of jump-out, after the successful isolation of fault: closing the switch of the B-2# distribution room 222, and recovering power supply of the section II bus of the A-2# distribution room; meanwhile, the A-1# distribution room starts 380V low-voltage automatic switching, and the low-voltage load carried by the section II bus of the A-1# distribution room resumes power supply.
The distribution room bus fault is characterized in that a fault point 4 is grounded (the distribution room bus I section is positioned in the A-2# distribution room), a distributed feeder line automatically detects fault signals, the fault point is positioned through logic judgment, all the line in-out switches (the A-2# distribution room bus I section loses power) on the A-2# distribution room bus I section are tripped, after the fault is successfully isolated, the A-2# distribution room starts 380V low-voltage automatic switching, and the load carried by the A-2# distribution room bus I section resumes power supply.
Claims (10)
1. The quick self-healing method for the line faults of the secondary trunk distribution network is characterized by comprising the following steps of: s100: determining a distribution room or a switching station where a fault point is located according to the DTU fault alarm signal; s200: determining a line with a fault; s300: determining a loop in which a line with a fault is located; s400: determining the running state of the power grid; s500: determining a switch connected with the fault line; and comprehensively researching and judging a self-healing strategy, selecting a switch needing to be opened from the switches connected with the fault line, opening the switch, determining whether a contact cable switch of a loop is required to be closed, and operating.
2. The method for rapid self-healing of line faults in a secondary trunk distribution network according to claim 1, wherein in normal operation, line faults between a first-stage distribution room of a first loop and a second-stage distribution room of the first loop are detected, and the step S500 is as follows: at the moment, the first-loop first-stage distribution room outlet switch and the first-loop second-stage distribution room inlet switch are connected with a fault line; comprehensively judging, namely opening an outlet switch of a first-stage distribution room of the first loop; switching off the inlet wire switch of the second-stage distribution room of the first loop; the first loop tie switch is closed.
3. The method for quickly self-healing line faults of a secondary trunk distribution network according to claim 1, wherein when the line incoming of a first-stage distribution room of a first loop is overhauled, the line faults between the first-stage distribution room of a second loop and a second-stage distribution room of the second loop are detected, and the step S500 comprises the following steps: at the moment, the outlet switch of the first-stage distribution room of the second loop and the inlet switch of the second-stage distribution room of the second loop are connected with a fault line; comprehensively judging, and opening the inlet switch of the first-stage distribution room of the second loop; switching off the outlet switch of the first-stage distribution room of the second loop; the second loop tie switch is closed.
4. The rapid self-healing method for the line faults of the secondary dry distribution network according to claim 2 is characterized in that the rapid self-healing method for the line faults of the secondary dry distribution network adopts a composite grid structure based on reliable power supply and comprises a main network and a branch network which are connected with each other, wherein the main network is a double-petal main network.
5. The quick self-healing method for line faults of a secondary trunk distribution network according to claim 4, wherein the branch network is a double-ring network comprising two branch loops formed by four distribution chambers, the number of primary distribution chambers in the four distribution chambers is two, the number of secondary distribution chambers is two, the two branch loops are respectively a first branch loop and a second branch loop, the end points of the two branch loops on the side of each primary distribution chamber are correspondingly connected with two sections of buses of a switching station in a main network one by one, and the two secondary distribution chambers are connected through a communication cable and operate in an open loop.
6. The method for rapid self-healing of line faults in a secondary trunk distribution network according to claim 5, wherein the two-petal type main network consists of a first transformer substation, a second transformer substation and first to fourth switch stations and forms two main loops.
7. The method for rapid self-healing of line faults in a secondary trunk distribution network according to claim 6, wherein the two main loops are identical in structure and are a first main loop and a second main loop respectively.
8. The quick self-healing method for the line faults of the secondary trunk distribution network is characterized by comprising the following steps of:
s100: determining a distribution room or a switching station where a fault point is located according to the DTU fault alarm signal;
s200: determining a line with a fault;
s300: determining a loop in which a line with a fault is located;
s400: determining the running state of the power grid;
s500: determining a switch connected with the fault line; comprehensively researching and judging a self-healing strategy, selecting a switch needing to be opened from switches connected with a fault line, opening the switch, determining whether a contact cable switch of a loop is required to be closed, and operating;
when the feeder line of one of the switchyard of the first loop fails, the step S500 is as follows: the first loop switch station feed-out line outlet switch is connected with a fault line; comprehensively judging, namely opening a feed-out line switch of the first loop switch station; and the switching station with double petals operates, and the interconnecting cable switch is in a closing state and does not process.
9. The quick self-healing method for the line faults of the secondary trunk distribution network is characterized by comprising the following steps of:
s100: determining a distribution room or a switching station where a fault point is located according to the DTU fault alarm signal;
s200: determining a line with a fault;
s300: determining a loop in which a line with a fault is located;
s400: determining the running state of the power grid;
s500: determining a switch connected with the fault line; comprehensively researching and judging a self-healing strategy, selecting a switch needing to be opened from switches connected with a fault line, opening the switch, determining whether a contact cable switch of a loop is required to be closed, and operating;
when the first loop first-stage distribution room line-in fault is in normal operation, the step S500 comprises the following steps: at the moment, only a first-stage distribution room inlet switch of a first loop is connected with a fault line, and the switch is operated to be opened; the first loop contacts the cable switch to close.
10. The quick self-healing method for the line faults of the secondary trunk distribution network is characterized by comprising the following steps of:
s100: determining a distribution room or a switching station where a fault point is located according to the DTU fault alarm signal;
s200: determining a line with a fault;
s300: determining a loop in which a line with a fault is located;
s400: determining the running state of the power grid;
s500: determining a switch connected with the fault line; comprehensively researching and judging a self-healing strategy, selecting a switch needing to be opened from switches connected with a fault line, opening the switch, determining whether a contact cable switch of a loop is required to be closed, and operating;
when the first-stage distribution room inlet wire of the first loop overhauls, the second-stage distribution room inlet wire of the second loop breaks down, S500 adopts the following steps: at the moment, only the incoming line switch of the first-stage distribution room of the second loop is connected with the incoming line of the first-stage distribution room of the second loop; comprehensively judging, and opening the inlet switch of the first-stage distribution room of the second loop; the second loop tie switch is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310087379.3A CN116111587A (en) | 2019-12-31 | 2019-12-31 | Method for quickly self-healing line faults of secondary trunk distribution network |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911411863.7A CN111082423B (en) | 2019-12-31 | 2019-12-31 | Rapid self-healing method for power distribution network |
| CN202310087379.3A CN116111587A (en) | 2019-12-31 | 2019-12-31 | Method for quickly self-healing line faults of secondary trunk distribution network |
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| CN202310087296.4A Pending CN116054150A (en) | 2019-12-31 | 2019-12-31 | Rapid self-healing method for bus faults of secondary dry distribution network |
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| CN113054631B (en) * | 2021-03-29 | 2022-07-22 | 国网河北省电力有限公司电力科学研究院 | Power distribution network fault isolation self-healing system and method |
| CN113162005A (en) * | 2021-04-23 | 2021-07-23 | 国网北京市电力公司 | Medium voltage distribution network system |
| CN113872160B (en) * | 2021-08-25 | 2023-07-25 | 国网河北省电力有限公司电力科学研究院 | Distributed power supply combined cutting system for power distribution network |
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| CN202940638U (en) * | 2012-10-24 | 2013-05-15 | 江苏省电力公司扬州供电公司 | Intelligent terminal ring main unit |
| CN105024363B (en) * | 2015-07-03 | 2018-02-13 | 珠海许继电气有限公司 | A kind of one-phase earthing failure in electric distribution network self-healing method of no channel |
| CN107612148B (en) * | 2017-10-31 | 2020-03-24 | 南方电网科学研究院有限责任公司 | Distribution network overhead line fault self-healing method and system |
| CN108521121B (en) * | 2018-04-02 | 2020-10-02 | 国家电网公司 | Method for selecting connection mode of town distribution line |
| CN208862570U (en) * | 2018-09-29 | 2019-05-14 | 许继集团有限公司 | Ring-main unit and bicyclic net type power distribution network |
| CN109149575A (en) * | 2018-09-29 | 2019-01-04 | 许继集团有限公司 | A kind of ring-main unit and bicyclic net type power distribution network |
| CN109347093B (en) * | 2018-10-18 | 2022-07-22 | 南京南瑞继保电气有限公司 | Power distribution network self-healing control method combining master station with local control |
| CN109697912B (en) * | 2019-03-07 | 2021-01-29 | 郑州大信科技有限公司 | Power distribution network operation and maintenance training system |
| CN109995024B (en) * | 2019-03-07 | 2020-12-29 | 广东电网有限责任公司 | Multi-stage power grid collaborative self-healing system and method |
| CN110336272B (en) * | 2019-05-22 | 2023-06-27 | 广东电网有限责任公司广州供电局 | Low-voltage interconnection switch box and interconnection switch power supply conversion method and device |
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| CN116054150A (en) | 2023-05-02 |
| CN116260135A (en) | 2023-06-13 |
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