CN103022992A - Feeder ground positioning method based on dispersion zero sequence voltage detection - Google Patents
Feeder ground positioning method based on dispersion zero sequence voltage detection Download PDFInfo
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Abstract
The invention discloses a feeder ground positioning method based on dispersion zero sequence voltage detection, which realizes line ground fault handling by using a feeder automatic system. The method comprises a fault monitoring, a fault trip, fault location, fault isolation, power recover, wherein the fault trip means that an outgoing breaker protects the trip, a segment switch is opened, and FTU (feeder terminal unit) uploads a signal; the fault location means that a fault interval is determined through a zero-sequence voltage detection; the fault isolation means that switches at two ends of a fault point are locked; and a power recover means that after a ground fault is removed and then the locked segment switch is opened to recover the power of the fault zone. When handling line grounding, a grounding interval can be fast located and automatically isolated without requiring staffs to investigate an entire line on scene to effectively reduce the manpower and the resource consumption and facilitate the fault maintenance personnel to immediately remove the fault point, so that not only the safety of the line maintenance staffs and line equipment is effectively guaranteed, the line outage time and the loss of a power outage user are lowered simultaneously, and the reliability of the power supply is greatly enhanced.
Description
Technical field
The present invention relates to the distribution feeder automation field, specifically a kind of feeder line grounding locating method based on disperseing zero sequence voltage detection.
Background technology
According to statistics, the fault of 10kV circuit generation single-phase earthing accounts for more than 30% of line fault, during circuit generation single-phase earthing harm larger, imbody in the following areas:
(1) harm converting equipment.Behind the 10kV distribution line generation single phase ground fault, the voltage transformer iron core is saturated, and exciting current increases, if long-play will burn voltage transformer.Also may produce the resonance overvoltage times over normal voltage, the insulation that jeopardizes converting equipment, severe patient insulate converting equipment to go out to wear, cause more major break down.
(2) harm controller switching equipment.Single phase ground fault may produce intermittent arc grounding after occuring, and causes resonance overvoltage, and overvoltage will further make the insulator dielectric on the circuit puncture, and cause serious short circuit accident.Simultaneously may burn distribution transformer, make lightning arrester, fuse insulating on the circuit puncture, burn, electrical fire may occur in severe patient.
(3) harm power distribution network.Serious single phase ground fault, possible destroyed area network system is stable, causes more major break down, affects power supply reliability.
(4) harm personal safety.Land this class single phase ground fault for wire, for pedestrian and line inspection personnel, the casualty accident of artificially getting an electric shock may occur.
(5) affect line loss.When single phase ground fault occurs, because distribution line ground connection directly or indirectly to ground discharge, will be caused larger electric energy loss.
At present, during 10KV feeder line ground connection, the conventional process mode is to cut off ground path, adopts manual type investigation line-to-ground point, often needs time of growing and a large amount of man power and materials, causes that circuit is long-time to have a power failure and the wasting of resources.
Summary of the invention
The invention provides a kind of feeder line grounding locating method based on disperseing zero sequence voltage detection, efficiently solve the problem that power supply is wasted time and energy, affected to process circuit ground connection.
In order to address the above problem, the present invention by the following technical solutions: based on the feeder line grounding locating method that disperses zero sequence voltage detection, realize the processing of line-to-ground fault by utilizing feed line automatization system, it is characterized in that,
Described feed line automatization system comprises:
Output in each transformer station arranges transformer station's wire-outgoing breaker, and distribution line of described each Substation control;
Connect by interconnection switch between the different distribution lines, described interconnection switch is in open mode under normal conditions;
Be provided with some block switches at the distribution basic routing line, a FTU who possesses the zero sequence voltage detection function is all installed at described each block switch place, and described block switch and the formation communication connection of power distribution automation main website;
Described method comprises following process:
Malfunction monitoring, the process of described fault trip is: whether transformer station's wire-outgoing breaker Real-Time Monitoring line-to-ground breaks down;
Fault trip, the process of described fault trip is: when line-to-ground fault occurs certain point on the circuit, transformer station's wire-outgoing breaker detects line-to-ground fault, protection action tripping operation, all block switches are all because of the decompression separating brake on the circuit, meanwhile, the FTU on the faulty line detects residual voltage, and uploads to the power distribution automation main website by block switch;
Fault location, the process of described fault location is: through behind the setting-up time, transformer station's wire-outgoing breaker automatic closing, block switch on the faulty line can be by distance transformer station order from the close-by examples to those far off, close a floodgate successively take setting-up time as the time limit, when block switch closes a floodgate, FTU on the block switch gets electric work, whether there is residual voltage in the detection line, when some FTU detect residual voltage, the block switch automatic blocking at this FTU place, and send information to main station system, orient the rear end that fault section is the locking block switch;
Fault Isolation, the process of described Fault Isolation is: after the block switch locking of faulty section front end, pass through setting-up time again after, the block switch of faulty section rear end or interconnection switch are kept blocking because of decompression, realize the isolation to faulty section;
Restore electricity, the described process of restoring electricity is: line attendant is to the fault outage range lookup and after getting rid of earth fault, and the block switch of controlling again locking closes a floodgate, and recovers the power supply of faulty section.
Further, the described setting-up time of said method is 7 seconds.
Further, in the described process that restores electricity of said method, when the faulty section rear end was block switch, interconnection switch can enter the countdown time after the tripping operation for the first time, interconnection switch auto-closing after the countdown time finishes realizes that other end transformer station is to the power supply of faulty section rear end part.
Further, the described countdown time of said method is 45 seconds.
Further, in the described process that restores electricity of said method, can be by a kind of combined floodgate of realizing the locking block switch in Remote and the on-site manual operation dual mode.
The invention has the beneficial effects as follows: during process circuit ground connection of the present invention, can locate rapidly between the access area and automatism isolation, do not need personnel to arrive on-the-spot investigation whole piece circuit, effectively reduce manpower and resource consumption, be convenient to the trouble hunting personnel to the timely eliminating of fault point, not only effective guarantee the safety of line maintenance personnel and line facility, reduced simultaneously the line outage time and to the loss that customer interrupted causes, greatly improved power supply reliability.
Description of drawings
Fig. 1 is schematic flow sheet of the present invention;
Fig. 2 is the conspectus of an embodiment of the present invention.
Embodiment
As shown in Figure 1, a kind of feeder line grounding locating method based on disperseing zero sequence voltage detection of this invention, it is by utilizing feed line automatization system to realize the processing of line-to-ground fault.
Described feed line automatization system comprises:
Output in each transformer station arranges transformer station's wire-outgoing breaker, and distribution line of described each Substation control;
Connect by interconnection switch between the different distribution lines, described interconnection switch is in open mode under normal conditions;
Be provided with some block switches at the distribution basic routing line, a FTU who possesses the zero sequence voltage detection function is all installed at described each block switch place, and described block switch and the formation communication connection of power distribution automation main website;
Described method comprises following process:
Malfunction monitoring, the process of described fault trip is: whether transformer station's wire-outgoing breaker Real-Time Monitoring line-to-ground breaks down;
Fault trip, the process of described fault trip is: when line-to-ground fault occurs certain point on the circuit, transformer station's wire-outgoing breaker detects line-to-ground fault, protection action tripping operation, all block switches are all because of the decompression separating brake on the circuit, meanwhile, the FTU on the faulty line detects residual voltage, and uploads to the power distribution automation main website by block switch;
Fault location, the process of described fault location is: after 7 seconds, transformer station's wire-outgoing breaker automatic closing, block switch on the faulty line can be by distance transformer station order from the close-by examples to those far off, close a floodgate successively take 7 seconds as the time limit, when block switch closes a floodgate, FTU on the block switch gets electric work, whether there is residual voltage in the detection line, when some FTU detect residual voltage, the block switch automatic blocking at this FTU place, and send information to main station system, orient the rear end that fault section is the locking block switch;
Fault Isolation, the process of described Fault Isolation is: after the block switch locking of faulty section front end, through after 7 seconds, the block switch of faulty section rear end or interconnection switch are kept blocking because of decompression again, realize the isolation to faulty section;
Restore electricity, the described process of restoring electricity is: line attendant is to the fault outage range lookup and after getting rid of earth fault, again by a kind of combined floodgate of realizing the locking block switch in Remote and the on-site manual operation dual mode, the power supply that recovers faulty section.
Further, in the described process that restores electricity, when the faulty section rear end is block switch, interconnection switch can be after for the first time tripping operation finishes 45 seconds auto-closing, realize that other end transformer station is to the power supply of faulty section rear end part.
Fig. 2 is the conspectus of an embodiment of the present invention.As shown in Figure 2, the winding diagram of a typical 10kV interconnector, K are transformer station's wire-outgoing breaker, K1, K2, K3 are block switch, and T is interconnection switch, and FTU1, FTU2, FTU3 are the FTU that possesses the zero sequence voltage detection function, suppose that the A point occurs earth point, processing procedure is as follows:
When 1) ground connection occuring, K detects line-to-ground fault, protection action tripping operation, and K1, K2, K3 are all because of the decompression separating brake; Simultaneously, the FTU1 on the circuit, FTU2, FTU3 detect residual voltage unusually and are uploaded to main website;
2) after 7 seconds, the K automatic closing, after 14 seconds, K1 closes a floodgate, and FTU1 gets electric rear detection residual voltage, owing to the residual voltage abnormal signal do not occur, it is normal to close a floodgate;
3) after 21 seconds, K2 closes a floodgate, and FTU2 gets electric rear detection residual voltage, the residual voltage abnormal signal occurs, and it is unusual to close a floodgate, the K2 locking, and the location faulty section is positioned at the K2 rear end;
4) after 28 seconds, the K3 decompression does not detect electric current, still is in blocking, realizes the faulty section isolation;
5) after 45 seconds, T is closed, and other end transformer is to the line powering between K3 and the T;
6) dispatcher's announcement trunk attendant is to fault outage range lookup earth fault, because fault is isolated, be in power down mode, the attendant can in harness danger yet, after line attendant finds fault point and maintenance platoon and removes, notify dispatcher's remote control FTU2 to close a floodgate or attendant's local operation combined floodgate, recover the interval power supply that has a power failure.
The above is preferred implementation of the present invention, for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, and these improvements and modifications also are regarded as protection scope of the present invention.
Claims (5)
1. based on the feeder line grounding locating method that disperses zero sequence voltage detection, realize the processing of line-to-ground fault by utilizing feed line automatization system, it is characterized in that,
Described feed line automatization system comprises:
Output in each transformer station arranges transformer station's wire-outgoing breaker, and distribution line of described each Substation control;
Connect by interconnection switch between the different distribution lines, described interconnection switch is in open mode under normal conditions;
Be provided with some block switches at the distribution basic routing line, a FTU who possesses the zero sequence voltage detection function is all installed at described each block switch place, and described block switch and the formation communication connection of power distribution automation main website;
Described method comprises following process:
Malfunction monitoring, the process of described fault trip is: whether transformer station's wire-outgoing breaker Real-Time Monitoring line-to-ground breaks down;
Fault trip, the process of described fault trip is: when line-to-ground fault occurs certain point on the circuit, transformer station's wire-outgoing breaker detects line-to-ground fault, protection action tripping operation, all block switches are all because of the decompression separating brake on the circuit, meanwhile, the FTU on the faulty line detects residual voltage, and uploads to the power distribution automation main website by block switch;
Fault location, the process of described fault location is: through behind the setting-up time, transformer station's wire-outgoing breaker automatic closing, block switch on the faulty line can be by distance transformer station order from the close-by examples to those far off, close a floodgate successively take setting-up time as the time limit, when block switch closes a floodgate, FTU on the block switch gets electric work, whether there is residual voltage in the detection line, when some FTU detect residual voltage, the block switch automatic blocking at this FTU place, and send information to main station system, orient the rear end that fault section is the locking block switch;
Fault Isolation, the process of described Fault Isolation is: after the block switch locking of faulty section front end, pass through setting-up time again after, the block switch of faulty section rear end or interconnection switch are kept blocking because of decompression, realize the isolation to faulty section;
Restore electricity, the described process of restoring electricity is: line attendant is to the fault outage range lookup and after getting rid of earth fault, and the block switch of controlling again locking closes a floodgate, and recovers the power supply of faulty section.
2. the feeder line grounding locating method based on disperseing zero sequence voltage detection according to claim 1 is characterized in that described setting-up time is 7 seconds.
3. the feeder line grounding locating method based on disperseing zero sequence voltage detection according to claim 1, it is characterized in that, in the described process that restores electricity, when the faulty section rear end is block switch, interconnection switch can enter the countdown time after the tripping operation for the first time, interconnection switch auto-closing after the countdown time finishes realizes that other end transformer station is to the power supply of faulty section rear end part.
4. the feeder line grounding locating method based on disperseing zero sequence voltage detection according to claim 3 is characterized in that the described countdown time is 45 seconds.
5. the feeder line grounding locating method based on disperseing zero sequence voltage detection according to claim 1, it is characterized in that, in the described process that restores electricity, can be by a kind of combined floodgate of realizing the locking block switch in Remote and the on-site manual operation dual mode.
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Cited By (14)
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| CN103746353A (en) * | 2013-12-31 | 2014-04-23 | 宏秀电气有限公司 | Self-healing control system of intelligent distribution network and working method thereof |
| CN103792465A (en) * | 2013-12-24 | 2014-05-14 | 中国矿业大学 | Power distribution network one-phase grounding fault location method based on zero sequence voltage |
| CN105137294A (en) * | 2015-09-25 | 2015-12-09 | 国网山东省电力公司济南供电公司 | Voltage type power distribution system single-phase grounding fault elimination method |
| CN105281304A (en) * | 2015-12-02 | 2016-01-27 | 国网上海市电力公司 | Quick feeder fault positioning and isolating method |
| CN105610137A (en) * | 2015-09-25 | 2016-05-25 | 国网山东省电力公司济南供电公司 | Centralized power-distribution-system single phase grounding fault elimination method |
| CN106026051A (en) * | 2016-07-26 | 2016-10-12 | 国电南瑞科技股份有限公司 | Fixed-value adaptive voltage and current time type on-site feeder automation method |
| CN106329465A (en) * | 2016-08-31 | 2017-01-11 | 河南华盛隆源电气有限公司 | Zero-sequence protection method and device taking zero-sequence voltage as criterion |
| CN106786473A (en) * | 2016-12-23 | 2017-05-31 | 广东电网有限责任公司珠海供电局 | A kind of arc suppression coil earthing system distribution line single-phase earth fault isolation method |
| CN106849033A (en) * | 2017-04-14 | 2017-06-13 | 云南电网有限责任公司电力科学研究院 | A kind of optimization method of transverter zero sequence overvoltage protection logic |
| CN107565923A (en) * | 2017-09-13 | 2018-01-09 | 无锡商业职业技术学院 | A kind of acquisition method of improved open OFF signal |
| CN107561404A (en) * | 2016-06-30 | 2018-01-09 | 中国电力科学研究院 | A kind of voltage selection method of resonant earthed system |
| CN107622644A (en) * | 2017-09-13 | 2018-01-23 | 无锡商业职业技术学院 | A kind of acquisition method of novel switched signal |
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| CN113484681A (en) * | 2021-07-14 | 2021-10-08 | 广西电网有限责任公司电力科学研究院 | On-site overlapping type feeder automation line ground fault interval detection method and device |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103792465A (en) * | 2013-12-24 | 2014-05-14 | 中国矿业大学 | Power distribution network one-phase grounding fault location method based on zero sequence voltage |
| CN103792465B (en) * | 2013-12-24 | 2016-05-04 | 中国矿业大学 | A kind of method of the range finding of the one-phase earthing failure in electric distribution network based on residual voltage |
| CN103746353A (en) * | 2013-12-31 | 2014-04-23 | 宏秀电气有限公司 | Self-healing control system of intelligent distribution network and working method thereof |
| CN105137294B (en) * | 2015-09-25 | 2018-08-31 | 国网山东省电力公司济南供电公司 | A kind of voltage-type distribution system single phase earthing troubleshooting methodology |
| CN105137294A (en) * | 2015-09-25 | 2015-12-09 | 国网山东省电力公司济南供电公司 | Voltage type power distribution system single-phase grounding fault elimination method |
| CN105610137A (en) * | 2015-09-25 | 2016-05-25 | 国网山东省电力公司济南供电公司 | Centralized power-distribution-system single phase grounding fault elimination method |
| CN105281304A (en) * | 2015-12-02 | 2016-01-27 | 国网上海市电力公司 | Quick feeder fault positioning and isolating method |
| CN107561404B (en) * | 2016-06-30 | 2021-04-06 | 中国电力科学研究院 | Voltage line selection method of resonant grounding system |
| CN107561404A (en) * | 2016-06-30 | 2018-01-09 | 中国电力科学研究院 | A kind of voltage selection method of resonant earthed system |
| CN106026051A (en) * | 2016-07-26 | 2016-10-12 | 国电南瑞科技股份有限公司 | Fixed-value adaptive voltage and current time type on-site feeder automation method |
| CN106329465A (en) * | 2016-08-31 | 2017-01-11 | 河南华盛隆源电气有限公司 | Zero-sequence protection method and device taking zero-sequence voltage as criterion |
| CN106329465B (en) * | 2016-08-31 | 2018-09-18 | 河南华盛隆源电气有限公司 | It is a kind of using residual voltage as the zero-sequenceprotection method and apparatus of criterion |
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| CN107622644A (en) * | 2017-09-13 | 2018-01-23 | 无锡商业职业技术学院 | A kind of acquisition method of novel switched signal |
| CN107565923A (en) * | 2017-09-13 | 2018-01-09 | 无锡商业职业技术学院 | A kind of acquisition method of improved open OFF signal |
| CN109061378A (en) * | 2018-06-09 | 2018-12-21 | 广西电网有限责任公司电力科学研究院 | Small current neutral grounding system ground fault checks method |
| CN113484681A (en) * | 2021-07-14 | 2021-10-08 | 广西电网有限责任公司电力科学研究院 | On-site overlapping type feeder automation line ground fault interval detection method and device |
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