CN107167709A - A kind of electric network fault localization method and alignment system - Google Patents
A kind of electric network fault localization method and alignment system Download PDFInfo
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- CN107167709A CN107167709A CN201710549646.9A CN201710549646A CN107167709A CN 107167709 A CN107167709 A CN 107167709A CN 201710549646 A CN201710549646 A CN 201710549646A CN 107167709 A CN107167709 A CN 107167709A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
Abstract
The invention discloses a kind of electric network fault localization method and electric network fault alignment system, wherein, electric network fault localization method comprises the following steps：Monitoring point is set, and gathers the transient current information on the three-phase line at each monitoring point；Calculate the zero-sequence current of each monitoring point；Judge whether power network is faulty according to zero-sequence current value；Abort situation is judged according to the zero-sequence current phase difference of adjacent monitoring point.The electric network fault alignment system includes the work station Surveillance center being connected along the spaced monitoring unit of power network three-phase line and with the monitoring unit.Compared to prior art, electric network fault localization method proposed by the present invention and electric network fault alignment system, fault location are timely, electric network fault point can be accurately fed back, without carrying out further artificial investigation, maintenance cost is greatly reduced, electric network fault maintenance efficiency is improved, is worthy to be popularized.
Description
Technical field
The present invention relates to energy monitor technical field, more particularly to a kind of electric network fault localization method and alignment system.
Background technology
Distribution is the link for being directly connected and being distributed to user electric energy in power system with user.Power distribution station is become by distribution
Electric institute's (being typically that the transmission voltage of power network is reduced into distribution voltage), high-tension distributing line (i.e. more than 1 kilovolt voltage), distribution become
Depressor, low-voltage distributing line (less than 1 kilovolt voltage) and corresponding control protection equipment composition, distribution voltage generally has 35~
60 kilovolts and 3~10 kilovolts etc..China's power network neutral point is earth-free, belongs to small current neutral grounding system.Power distribution network is in actual fortune
In row, it some times happens that being grounded and short trouble, general generation earth fault is more, particularly severe certainly in thunderstorm, strong wind etc.
When right weather, singlephase earth fault odds is more frequent.Although after single-phase earthing, failure phase-to-ground voltage drop
Low, non-faulting phase voltage rise, voltage is still symmetrical, does not influence customer power supply, still, and single-phase earthing long-play can be serious
Influence transformer and power distribution network safety and economic operation.Therefore, occur to be also required to, by line outage, search event after single-phase earthing
Barrier, particularly when route selection, can cause the power failure of fault-free circuit, cause the reduction of power supply reliability.Therefore, power distribution network
The processing requirement of failure is in time, accurately.Existing electric network fault localization method, fault location is time-consuming longer, and precision is not high, and
Electric network fault point can not be accurately fed back, often needs carry out further artificial investigation, cause pair of manpower and emergency repair time
Waste again, electric network fault maintenance efficiency is low.
The content of the invention
In consideration of it, the present invention's provides a kind of electric network fault localization method and alignment system, to solve existing power network event
Hindering localization method needs artificial investigation, and maintenance cost is high, the low problem of electric network fault maintenance efficiency.
One aspect of the present invention provides a kind of electric network fault localization method, comprises the following steps：
(1) monitoring point is arranged at intervals on power network three-phase line, and gathers the wink on the three-phase line at each monitoring point
When current information；
(2) zero-sequence current of each monitoring point is calculated according to the transient current information；
(3) the zero-sequence current value for calculating obtained each monitoring point is compared with default zero-sequence current threshold value, if meter
When obtained zero-sequence current value is less than zero-sequence current threshold value set in advance, then power network fault-free is judged, if calculating what is obtained
When zero-sequence current value is more than or equal to zero-sequence current threshold value set in advance, then judge that power network is faulty；
(4) if judging in step (3), power network is faulty, calculates the zero-sequence current phase difference of adjacent monitoring point, if adjacent prison
When the zero-sequence current phase difference of measuring point is 0 °, then fault-free between adjacent monitoring point is judged, if the zero-sequence current of adjacent monitoring point
It is when phase difference is 180 °, then faulty between judgement adjacent monitoring point.
It is preferred that, the transient current information on three-phase line in the step (1) at each monitoring point is respectively by being arranged at
Current transformer detection on three-phase line.
Further preferably, in the step (2) zero-sequence current of each monitoring point by by the triple line at the monitoring point
Transient current on road, which is added, to be obtained.
Further preferably, the zero-sequence current phase difference θ of the adjacent monitoring point in the step (4)1,2Calculation formula is：θ1,2
=(n1-n2) * 36 °, wherein, n1Represent the zero-sequence current of the first monitoring point in adjacent monitoring point, n2Represent in adjacent monitoring point
The second monitoring point zero-sequence current.
Present invention also offers a kind of electric network fault alignment system, including：Along the spaced monitoring of power network three-phase line
Unit and the work station Surveillance center being connected with the monitoring unit, wherein, the monitoring unit includes being respectively arranged at three-phase
A phase current mutual inductors, B phase current mutual inductors, C phase current mutual inductors on circuit, A phase current mutual inductors, B phase current mutual inductances
Device, C phase current mutual inductors connect A phase currents sensor, B phase currents sensor, C phase current sensors, A phase currents sensing respectively
Device, B phase currents sensor, C phase currents sensor are connected with single-chip microcomputer, and the single-chip microcomputer in each monitoring unit is supervised with work station
Control center is connected, wherein, A phase current mutual inductors, B phase current mutual inductors, C phase current mutual inductors are sensed by A phase currents respectively
Device, B phase currents sensor, C phase currents sensor send the transient current information collected to single-chip microcomputer, and single-chip microcomputer is received
After above- mentioned information, the zero-sequence current of the monitoring point is calculated, and the zero-sequence current information is sent to work station Surveillance center,
Work station Surveillance center is received after the zero-sequence current information, further judges abort situation.
It is preferred that, the electric network fault alignment system also includes the memory cell being connected with work station Surveillance center, for depositing
Store up default zero-sequence current threshold value.
Further preferably, A phase current mutual inductors, B phase current mutual inductors, C phase current mutual inductors are respectively by being wirelessly transferred
Module connection A phase currents sensor, B phase currents sensor, C phase current sensors, A phase currents sensor, B phase currents sensing
Device, C phase currents sensor are connected with single-chip microcomputer by wireless transport module.
Further preferably, the single-chip microcomputer in each monitoring unit is connected with work station Surveillance center by wireless transport module
Connect.
The electric network fault localization method that the present invention is provided can carry out malfunction monitoring to power network line in real time, by power network three
Monitoring point is arranged at intervals on phase line, and detects the transient current information on the three-phase line at each monitoring point, can be real-time
The transient current information on three-phase line is obtained, the zero sequence electricity of each monitoring point can be obtained by above-mentioned transient current information
Stream, by the way that the zero-sequence current value of calculating is compared with default zero-sequence current threshold value, it is possible to determine that whether power network is faulty,
If power network is faulty, by the zero-sequence current phase difference for further calculating adjacent monitoring point, it is possible to determine that the position of electric network fault,
Tour and the malfunction elimination time of staff is reduced, maintenance is timely, and work station power network maintenance personal can be to failure route
It is independently serviced, maintenance efficiency is high, labor intensity is small, reduces fault impact, it is ensured that the normal power supply of regular link.
The electric network fault alignment system that the present invention is provided, the instantaneous of three-phase line can be detected in real time by current transformer
Current information, can be sent the transient current information to single-chip microcomputer by the current sensor being connected with current transformer,
Single-chip microcomputer is received after above- mentioned information, can calculate the zero-sequence current of the monitoring point, and the zero-sequence current information is sent
To work station Surveillance center, work station Surveillance center is received after the zero-sequence current information, by with default zero-sequence current
Threshold value is compared, it is possible to determine that whether power network is faulty, if power network is faulty, by further calculate adjacent monitoring point zero
Sequence current and phase difference can be determined that abort situation.
Brief description of the drawings
Fig. 1 is the flow chart of electric network fault localization method proposed by the present invention；
Fig. 2 is the structured flowchart of electric network fault alignment system proposed by the present invention；
Fig. 3 is the structural representation of monitoring unit.
Embodiment
The present invention is further explained below in conjunction with specific embodiment, but does not limit to the present invention.
As shown in figure 1, the invention provides a kind of electric network fault localization method, comprising the following steps：
(1) monitoring point is arranged at intervals on power network three-phase line, and gathers the wink on the three-phase line at each monitoring point
When current information；
(2) zero-sequence current of each monitoring point is calculated according to the transient current information；
(3) the zero-sequence current value for calculating obtained each monitoring point is compared with default zero-sequence current threshold value, if meter
When obtained zero-sequence current value is less than zero-sequence current threshold value set in advance, then power network fault-free is judged, if calculating what is obtained
When zero-sequence current value is more than or equal to zero-sequence current threshold value set in advance, then judge that power network is faulty；
(4) if judging in step (3), power network is faulty, calculates the zero-sequence current phase difference of adjacent monitoring point, if adjacent prison
When the zero-sequence current phase difference of measuring point is 0 °, then fault-free between adjacent monitoring point is judged, if the zero-sequence current of adjacent monitoring point
It is when phase difference is 180 °, then faulty between judgement adjacent monitoring point.
The electric network fault localization method can carry out malfunction monitoring to power network line in real time, between on power network three-phase line
Every setting monitoring point, and the transient current information on the three-phase line at each monitoring point is detected, triple line can be obtained in real time
Transient current information on road, the zero-sequence current of each monitoring point can be obtained by above-mentioned transient current information, by that will count
The zero-sequence current value of calculation is compared with default zero-sequence current threshold value, it is possible to determine that whether power network is faulty, if power network has event
Barrier, by the zero-sequence current phase difference for further calculating adjacent monitoring point, it is possible to determine that the position of electric network fault, reduces work
The tour of personnel and malfunction elimination time, maintenance are timely, and work station power network maintenance personal can individually be tieed up to failure route
Repair, maintenance efficiency is high, labor intensity is small, reduces fault impact, it is ensured that the normal power supply of regular link.
Wherein, the transient current information on the three-phase line in the step (1) at each monitoring point is respectively by being arranged at
Current transformer detection on three-phase line.
Wherein, the zero-sequence current of each monitoring point passes through on the three-phase line at the monitoring point in the step (2)
Transient current, which is added, to be obtained.
Wherein, the zero-sequence current phase difference θ of the adjacent monitoring point in the step (4)1,2Calculation formula is：θ1,2=(n1-
n2) * 36 °, wherein, n1Represent the zero-sequence current of the first monitoring point in adjacent monitoring point, n2Represent second in adjacent monitoring point
The zero-sequence current of monitoring point.
As shown in Figure 2 and Figure 3, the invention provides a kind of electric network fault alignment system, including：Along between power network three-phase line
Every the monitoring unit 1 of setting and the work station Surveillance center 2 being connected with the monitoring unit 1, wherein, the monitoring unit 1 is wrapped
Include the A phase current mutual inductors 11 being respectively arranged on three-phase line, B phase current mutual inductors 12, C phase current mutual inductors 13, A phases electricity
Current transformer 11, B phase current mutual inductors 12, C phase current mutual inductors 13 connect A phase currents sensor 14, B phase currents sensing respectively
Device 15, C phase currents sensor 16, A phase currents sensor 14, B phase currents sensor 15, C phase currents sensor 16 are and monolithic
Machine 17 is connected, and the single-chip microcomputer 17 in each monitoring unit 1 is connected with work station Surveillance center 2, wherein, A phase current mutual inductors 11,
B phase current mutual inductors 12, C phase current mutual inductors 13 pass through A phase currents sensor 14, B phase currents sensor 15, C phases electricity respectively
Flow sensor 16 sends the transient current information collected to single-chip microcomputer 17, and single-chip microcomputer 17 is received after above- mentioned information, calculates
Go out the zero-sequence current of the monitoring point, and the zero-sequence current information is sent to work station Surveillance center 2, work station Surveillance center
2 receive after the zero-sequence current information, further judge abort situation.
The electric network fault alignment system, can detect the transient current information of three-phase line in real time by current transformer,
The transient current information can be sent to single-chip microcomputer by the current sensor being connected with current transformer, single-chip microcomputer is received
To after above- mentioned information, the zero-sequence current of the monitoring point can be calculated, and the zero-sequence current information is sent to work station prison
Control center, work station Surveillance center is received after the zero-sequence current information, by being compared with default zero-sequence current threshold value
Compared with, it is possible to determine that whether power network is faulty, if power network is faulty, by the zero-sequence current phase for further calculating adjacent monitoring point
Difference can be determined that abort situation.
Specifically：Whether faulty power network decision method be as follows：Zero-sequence current value and default zero sequence electricity will be received
Stream threshold value is compared, if the zero-sequence current value received is less than default zero-sequence current threshold value, judges power network fault-free, if
The zero-sequence current value received is more than or equal to default zero-sequence current threshold value, then judges that power network is faulty.
The decision method of abort situation is as follows：The zero-sequence current phase difference of adjacent monitoring point is calculated, if adjacent monitoring point
When zero-sequence current phase difference is 0 °, then fault-free between adjacent monitoring point is judged, if the zero-sequence current phase difference of adjacent monitoring point
For 180 ° when, then judge adjacent monitoring point between it is faulty.
As the improvement of technical scheme, as shown in Fig. 2 electric network fault alignment system also includes and work station Surveillance center 2
The memory cell 3 of connection, as needed, can be single to storage by input equipment for storing default zero-sequence current threshold value
Default zero-sequence current threshold value is modified in member.
Wherein, A phase current mutual inductors 11, B phase current mutual inductors 12, C phase current mutual inductors 13 are respectively by being wirelessly transferred
Module connection A phase currents sensor 14, B phase currents sensor 15, C phase currents sensor 16, A phase currents sensor 14, B phases electricity
Flow sensor 15, C phase currents sensor 16 are connected with single-chip microcomputer 17 by wireless transport module.
Wherein, the single-chip microcomputer 17 in each monitoring unit 1 is connected with work station Surveillance center 2 by wireless transport module.
The embodiment of the present invention is write according to progressive mode, highlights each embodiment
Difference, its similar portion can be with cross-reference.
Embodiments of the present invention are elaborated above in conjunction with accompanying drawing, but the present invention is not limited to above-mentioned implementation
Mode, can also be on the premise of present inventive concept not be departed from the knowledge that those of ordinary skill in the art possess
Various changes can be made.
Claims (8)
1. a kind of electric network fault localization method, it is characterised in that comprise the following steps：
(1) monitoring point is arranged at intervals on power network three-phase line, and gathers the instantaneous electricity on the three-phase line at each monitoring point
Stream information；
(2) zero-sequence current of each monitoring point is calculated according to the transient current information；
(3) the zero-sequence current value for calculating obtained each monitoring point is compared with default zero-sequence current threshold value, if calculating
When the zero-sequence current value arrived is less than zero-sequence current threshold value set in advance, then power network fault-free is judged, if calculating obtained zero sequence
When current value is more than or equal to zero-sequence current threshold value set in advance, then judge that power network is faulty；
(4) if judging in step (3), power network is faulty, calculates the zero-sequence current phase difference of adjacent monitoring point, if adjacent monitoring point
Zero-sequence current phase difference be 0 ° when, then judge adjacent monitoring point between fault-free, if the zero-sequence current phase of adjacent monitoring point
It is when difference is 180 °, then faulty between judgement adjacent monitoring point.
2. according to the electric network fault localization method described in claim 1, it is characterised in that：In the step (1) at each monitoring point
Three-phase line on transient current information detected respectively by the current transformer that is arranged on three-phase line.
3. according to the electric network fault localization method described in claim 1, it is characterised in that：Each monitoring point in the step (2)
Zero-sequence current by by the three-phase line at the monitoring point transient current be added obtain.
4. according to the electric network fault localization method described in claim 1, it is characterised in that：Adjacent monitoring in the step (4)
The zero-sequence current phase difference θ of point1,2Calculation formula is：θ1,2=(n1-n2) * 36 °, wherein, n1Represent first in adjacent monitoring point
The zero-sequence current of monitoring point, n2Represent the zero-sequence current of the second monitoring point in adjacent monitoring point.
5. a kind of electric network fault alignment system, it is characterised in that including：Along the spaced monitoring unit of power network three-phase line
(1) the work station Surveillance center (2) and with the monitoring unit (1) being connected, wherein, the monitoring unit (1) includes setting respectively
A phase current mutual inductors (11), B phase current mutual inductors (12), the C phase current mutual inductors (13), A phase currents being placed on three-phase line
Transformer (11), B phase current mutual inductors (12), C phase current mutual inductors (13) connect A phase currents sensor (14), B phases electricity respectively
Flow sensor (15), C phase currents sensor (16), A phase currents sensor (14), B phase currents sensor (15), C phase currents are passed
Sensor (16) is connected with single-chip microcomputer (17), and the single-chip microcomputer (17) in each monitoring unit (1) connects with work station Surveillance center (2)
Connect, wherein, A phase current mutual inductors (11), B phase current mutual inductors (12), C phase current mutual inductors (13) pass through A phase currents respectively
Sensor (14), B phase currents sensor (15), C phase currents sensor (16) send the transient current information collected to list
Piece machine (17), single-chip microcomputer (17) is received after above- mentioned information, calculates the zero-sequence current of the monitoring point, and by the zero-sequence current
Information is sent to work station Surveillance center (2), and work station Surveillance center (2) is received after the zero-sequence current information, further
Judge abort situation.
6. according to the electric network fault alignment system described in claim 5, it is characterised in that：Also include and work station Surveillance center
(2) memory cell (3) of connection, for storing default zero-sequence current threshold value.
7. according to the electric network fault alignment system described in claim 5, it is characterised in that：A phase current mutual inductors (11), B phases electricity
Current transformer (12), C phase current mutual inductors (13) connect A phase currents sensor (14), B phases electricity by wireless transport module respectively
Flow sensor (15), C phase currents sensor (16), A phase currents sensor (14), B phase currents sensor (15), C phase currents are passed
Sensor (16) is connected with single-chip microcomputer (17) by wireless transport module.
8. according to the electric network fault alignment system any one of claim 5 to 7, it is characterised in that：Each monitoring unit (1)
In single-chip microcomputer (17) be connected with work station Surveillance center (2) by wireless transport module.
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| CN201710549646.9A CN107167709A (en) | 2017-07-07 | 2017-07-07 | A kind of electric network fault localization method and alignment system |
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| CN201710549646.9A CN107167709A (en) | 2017-07-07 | 2017-07-07 | A kind of electric network fault localization method and alignment system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109470991A (en) * | 2018-10-29 | 2019-03-15 | 中电普瑞科技有限公司 | A kind of line fault of electrical power system recognition methods and system |
| CN109613383A (en) * | 2018-12-27 | 2019-04-12 | 中国电力科学研究院有限公司 | Meter and the alternating current circuit fault judgment method and system of direct current access |
| CN109839568A (en) * | 2019-02-25 | 2019-06-04 | 国家电网有限公司 | Transmission line malfunction diagnostic system based on zero-sequence current detection |
| CN110518702A (en) * | 2019-09-09 | 2019-11-29 | 陕西省地方电力(集团)有限公司西安供电分公司 | Line feed terminals, feeder line control system and power network monitoring method |
| CN110672979A (en) * | 2019-10-21 | 2020-01-10 | 广州航海学院 | Power distribution network line fault diagnosis system and method |
| CN112531767A (en) * | 2020-10-19 | 2021-03-19 | 国网辽宁省电力有限公司 | Neutral point grounding mode and single-phase grounding fault positioning method for medium-voltage island microgrid |
| CN114062837A (en) * | 2021-10-15 | 2022-02-18 | 中山市沃尔沃照明科技有限公司 | Urban road and park lighting system monitoring method and device based on big data |
| CN115575857A (en) * | 2022-12-08 | 2023-01-06 | 江西广凯新能源股份有限公司 | Emergency protection method and device for high-voltage wire breakage |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109470991A (en) * | 2018-10-29 | 2019-03-15 | 中电普瑞科技有限公司 | A kind of line fault of electrical power system recognition methods and system |
| CN109613383A (en) * | 2018-12-27 | 2019-04-12 | 中国电力科学研究院有限公司 | Meter and the alternating current circuit fault judgment method and system of direct current access |
| CN109839568A (en) * | 2019-02-25 | 2019-06-04 | 国家电网有限公司 | Transmission line malfunction diagnostic system based on zero-sequence current detection |
| CN110518702A (en) * | 2019-09-09 | 2019-11-29 | 陕西省地方电力(集团)有限公司西安供电分公司 | Line feed terminals, feeder line control system and power network monitoring method |
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| CN112531767A (en) * | 2020-10-19 | 2021-03-19 | 国网辽宁省电力有限公司 | Neutral point grounding mode and single-phase grounding fault positioning method for medium-voltage island microgrid |
| CN114062837A (en) * | 2021-10-15 | 2022-02-18 | 中山市沃尔沃照明科技有限公司 | Urban road and park lighting system monitoring method and device based on big data |
| CN114062837B (en) * | 2021-10-15 | 2022-08-02 | 中山市沃尔沃照明科技有限公司 | Urban road and park lighting system monitoring method and device based on big data |
| CN115575857A (en) * | 2022-12-08 | 2023-01-06 | 江西广凯新能源股份有限公司 | Emergency protection method and device for high-voltage wire breakage |
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Application publication date: 20170915 |