CN103278741B - A kind of mountain fire causes transmission line of electricity single-phase high-impedance diagnostic method - Google Patents
A kind of mountain fire causes transmission line of electricity single-phase high-impedance diagnostic method Download PDFInfo
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- CN103278741B CN103278741B CN201310173207.4A CN201310173207A CN103278741B CN 103278741 B CN103278741 B CN 103278741B CN 201310173207 A CN201310173207 A CN 201310173207A CN 103278741 B CN103278741 B CN 103278741B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 32
- 230000005611 electricity Effects 0.000 title claims abstract description 23
- 238000002405 diagnostic procedure Methods 0.000 title claims abstract description 10
- 230000001681 protective effect Effects 0.000 claims abstract description 8
- 238000005070 sampling Methods 0.000 claims description 26
- 101100129590 Schizosaccharomyces pombe (strain 972 / ATCC 24843) mcp5 gene Proteins 0.000 claims description 15
- 238000000034 method Methods 0.000 abstract description 17
- 238000011835 investigation Methods 0.000 abstract description 4
- 230000004807 localization Effects 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000003745 diagnosis Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
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Abstract
The invention discloses a kind of mountain fire and cause transmission line of electricity single-phase high-impedance diagnostic method.First the inventive method is carried out differential to faulted phase current waveform instantaneous value and to be differentiated process, to differential differentiate process after faulted phase current waveform carry out discontiguous area detection at its near zero-crossing point, if detect differential differentiate process after faulted phase current waveform have discontiguous area to exist at its current waveform near zero-crossing point, then be determined as mountain fire and cause transmission line of electricity single-phase high-impedance, protective relaying device exports diagnostic result and sends alarm signal, this is differentiated that result is combined with fault localization result, rapid looking up the fault point after can be line single phase grounding failure, investigation line fault and recovery line powering provide strong reference frame.
Description
Technical field
The present invention relates to electric power system fault Intelligent Diagnosis Technology field, specifically relate to a kind of mountain fire and cause transmission line of electricity single-phase high-impedance diagnostic method.
Background technology
Transmission line one-phase earth fault accounts for line fault type more than 80%, and for the grid power transmission circuit of mountainous terrain, mountain fire causes transmission line of electricity high resistance earthing fault to account for the sizable ratio of singlephase earth fault.After mountain fire causes transmission line of electricity single-phase high-impedance, because transmission line of electricity is electric arc type earth fault to earth fault, the vestige of incendiary charge can be left on transmission line of electricity after arc burning, this indication character region is little, not easily discover, often need fault track walker to come and go three, four line walkings and just can find out failure cause, increase line walking workload on foot.Therefore, study a kind of mountain fire and cause transmission line of electricity single-phase high-impedance diagnostic method, after can be transmission line one-phase earth fault, rapid looking up the fault point, investigation line fault and the rapid line powering that recovers provide strong reference frame.
Summary of the invention
The object of the invention is to the deficiency overcoming prior art existence, provide a kind of mountain fire to cause transmission line of electricity single-phase high-impedance diagnostic method.
For achieving the above object, the inventive method adopts following technical scheme:
A kind of mountain fire causes transmission line of electricity single-phase high-impedance diagnostic method, and its main points are, comprise following sequential steps:
(1) from the moment occurs transmission line one-phase earth fault, terminate for step-length is incremented to the circuit breaker trip moment successively with sampling interval duration Δ t, calculate the differential derivative value that faulted phase current instantaneous value i (t) of each t sampling instant is corresponding successively
wherein, t is sampling instant; I (t), i (t-Δ t) are respectively the faulted phase current waveform sample values of t, t-Δ t sampling instant; Δ t is sampling interval duration;
(2) set the first cluster counters num1=0, choose first group of time variable t
1, t
1initial value is taken as t
0, enter step (3); Wherein, t
0for the moment occurs transmission line one-phase earth fault;
(3) set the second cluster counters num2=0, setting the 3rd cluster counters num3=1, enters step (4);
(4) second group of time variable t is chosen
2, t
2initial value is taken as t
1, at its near zero-crossing point, whether discontiguous area is existed to faulted phase current waveform and detects, detect judgement as follows successively:
If (a) | i ' (t
2) |≤ε and num3=1, then the second cluster counters num2 adds 1 on its original base, i.e. num2=num2+1, second group of time variable t
2its original base increases a sampling interval duration Δ t, i.e. t
2=t
2+ Δ t, returns step (a) until the circuit breaker trip moment terminates; Wherein, ε is setting valve;
i (t
2), i (t
2-Δ t) be respectively t
2, t
2the faulted phase current waveform sample values of-Δ t sampling instant; Δ t is sampling interval duration;
If (b) | i ' (t
2) | > ε, then make the 3rd cluster counters num3 equal zero, i.e. num3=0; Wherein, ε is setting valve;
C if () num2>index and num3=0, then the first cluster counters num1 adds 1 on its original base, i.e. num1=num1+1; Wherein, index is integer variable definite value;
If d () num3=0, then by t
2value gives t
1even, t
1=t
2, exit step (4), enter step (5);
(5) first groups of time variable t
1from t
2value starts, and increases progressively successively, returns step (3) loop computation, until the circuit breaker trip moment terminates with sampling interval duration Δ t for step-length;
(6) if num1 >=1, be then judged as that mountain fire causes transmission line of electricity single-phase high-impedance, protective relaying device exports diagnostic result and sends alarm signal.
Feature of the present invention and technological achievement:
First the inventive method is carried out differential to faulted phase current waveform instantaneous value and to be differentiated process, to differential differentiate process after faulted phase current waveform carry out discontiguous area detection at its near zero-crossing point, if detect differential differentiate process after faulted phase current waveform have discontiguous area to exist at its current waveform near zero-crossing point, then be determined as mountain fire and cause transmission line of electricity single-phase high-impedance, protective relaying device exports diagnostic result and sends alarm signal, this is differentiated that result is combined with fault localization result, rapid looking up the fault point after can be line single phase grounding failure, investigation line fault and recovery line powering provide strong reference frame.
Accompanying drawing explanation
Fig. 1 is that a kind of mountain fire of application the inventive method causes transmission line of electricity single-phase high-impedance diagnostic method process flow diagram.
Embodiment
According to Figure of description, technical scheme of the present invention is expressed in further detail below.
Fig. 1 is that a kind of mountain fire of application the inventive method causes transmission line of electricity single-phase high-impedance diagnostic method process flow diagram.In the present embodiment, after transmission line of electricity generation singlephase earth fault, protective relaying device startup separator record ripple also generates failure wave-recording file, until transmission line of electricity two ends circuit breaker trip.Whether after protective relaying device completes failure wave-recording, fault localization function, start causing transmission line of electricity high resistance earthing fault to carry out Precise Diagnosis by mountain fire, concrete diagnosis algorithm is sequentially as follows:
(1) from the moment occurs transmission line one-phase earth fault, terminate for step-length is incremented to the circuit breaker trip moment successively with sampling interval duration Δ t, calculate the differential derivative value that faulted phase current instantaneous value i (t) of each t sampling instant is corresponding successively
wherein, t is sampling instant; I (t), i (t-Δ t) are respectively the faulted phase current waveform sample values of t, t-Δ t sampling instant; Δ t is sampling interval duration;
(2) set the first cluster counters num1=0, choose first group of time variable t
1, t
1initial value is taken as t
0, enter step (3); Wherein, t
0for the moment occurs transmission line one-phase earth fault;
(3) set the second cluster counters num2=0, setting the 3rd cluster counters num3=1, enters step (4);
(4) second group of time variable t is chosen
2, t
2initial value is taken as t
1, at its near zero-crossing point, whether discontiguous area is existed to faulted phase current waveform and detects, detect judgement as follows successively:
If (a) | i ' (t
2) |≤ε and num3=1, then the second cluster counters num2 adds 1 on its original base, i.e. num2=num2+1, second group of time variable t
2its original base increases a sampling interval duration Δ t, i.e. t
2=t
2+ Δ t, returns step (a) until the circuit breaker trip moment terminates; Wherein, ε is setting valve;
i (t
2), i (t
2-Δ t) be respectively t
2, t
2the faulted phase current waveform sample values of-Δ t sampling instant; Δ t is sampling interval duration;
If (b) | i ' (t
2) | > ε, then make the 3rd cluster counters num3 equal zero, i.e. num3=0; Wherein, ε is setting valve;
C if () num2>index and num3=0, then the first cluster counters num1 adds 1 on its original base, i.e. num1=num1+1; Wherein, index is integer variable definite value;
If d () num3=0, then by t
2value gives t
1even, t
1=t
2, exit step (4), enter step (5);
(5) first groups of time variable t
1from t
2value starts, and increases progressively successively, returns step (3) loop computation, until the circuit breaker trip moment terminates with sampling interval duration Δ t for step-length;
(6) if num1 >=1, be then judged as that mountain fire causes transmission line of electricity single-phase high-impedance, protective relaying device exports diagnostic result and sends alarm signal.
First the inventive method is carried out differential to faulted phase current waveform instantaneous value and to be differentiated process, to differential differentiate process after faulted phase current waveform carry out discontiguous area detection at its near zero-crossing point, if detect differential differentiate process after faulted phase current waveform have discontiguous area to exist at its current waveform near zero-crossing point, then be determined as mountain fire and cause transmission line of electricity single-phase high-impedance, protective relaying device exports diagnostic result and sends alarm signal, this is differentiated that result is combined with fault localization result, rapid looking up the fault point after can be line single phase grounding failure, investigation line fault and recovery line powering provide strong reference frame.
The foregoing is only preferred embodiment of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (1)
1. mountain fire causes a transmission line of electricity single-phase high-impedance diagnostic method, it is characterized in that, comprises following sequential steps:
(1) from the moment occurs transmission line one-phase earth fault, terminate for step-length is incremented to the circuit breaker trip moment successively with sampling interval duration △ t, calculate the differential derivative value that faulted phase current instantaneous value i (t) of each t sampling instant is corresponding successively
wherein, t is sampling instant; I (t), i (t-△ t) are respectively the faulted phase current waveform sample values of t, t-△ t sampling instant; △ t is sampling interval duration;
(2) set the first cluster counters num1=0, choose first group of time variable t
1, t
1initial value is taken as t
0, enter step (3); Wherein, t
0for the moment occurs transmission line one-phase earth fault;
(3) set the second cluster counters num2=0, setting the 3rd cluster counters num3=1, enters step (4);
(4) second group of time variable t is chosen
2, t
2initial value is taken as t
1, at its near zero-crossing point, whether discontiguous area is existed to faulted phase current waveform and detects, detect judgement as follows successively:
If (a) | i ' (t
2) |≤ε and num3=1, then the second cluster counters num2 adds 1 on its original base, i.e. num2=num2+1, second group of time variable t
2its original base increases a sampling interval duration △ t, i.e. t
2=t
2+ △ t, returns step (a) until the circuit breaker trip moment terminates; Wherein, ε is setting valve;
i (t
2), i (t
2-△ t) is respectively t
2, t
2the faulted phase current waveform sample values of-△ t sampling instant;
If (b) | i ' (t
2) | > ε, then make the 3rd cluster counters num3 equal zero, i.e. num3=0;
C if () num2>index and num3=0, then the first cluster counters num1 adds 1 on its original base, i.e. num1=num1+1; Wherein, index is integer variable definite value;
If d () num3=0, then by t
2value gives t
1even, t
1=t
2, exit step (4), enter step (5);
(5) first groups of time variable t
1from t
2value starts, and increases progressively successively, returns step (3) loop computation, until the circuit breaker trip moment terminates with sampling interval duration △ t for step-length;
(6) if num1 >=1, be then judged as that mountain fire causes transmission line of electricity single-phase high-impedance, protective relaying device exports diagnostic result and sends alarm signal.
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| CN201310173207.4A CN103278741B (en) | 2013-05-10 | 2013-05-10 | A kind of mountain fire causes transmission line of electricity single-phase high-impedance diagnostic method |
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| CN103278741B true CN103278741B (en) | 2015-11-04 |
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| CN105738762A (en) * | 2016-02-01 | 2016-07-06 | 国网安徽省电力公司 | Fault single-end locating method based on Thompson theory arc model |
| CN112710919B (en) * | 2020-11-18 | 2022-07-26 | 国网浙江省电力有限公司温州供电公司 | Mountain area power distribution network line fault cause diagnosis method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101187687A (en) * | 2007-12-21 | 2008-05-28 | 清华大学 | High resistance earthing fault detection method based on transient traveling wave |
| CN102854428A (en) * | 2011-06-28 | 2013-01-02 | 西门子公司 | Method and device for short circuit detection |
| CN102928728A (en) * | 2012-10-30 | 2013-02-13 | 清华大学 | High-resistance grounding fault detection method based on zero-sequence current waveform distortion convexity and concavity |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI100922B (en) * | 1996-11-04 | 1998-03-13 | Abb Transmit Oy | Method for detecting and locating a grounding fault with great resistance in an electricity distribution network |
| ITMI20071642A1 (en) * | 2007-08-07 | 2009-02-08 | Abb Service Srl | A PROCEDURE FOR THE MANAGEMENT OF A FAILURE EVENT IN A DISTRIBUTION NETWORK OF ELECTRICAL ENERGY AND A RELATED ELECTRONIC PROTECTION UNIT. |
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2013
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101187687A (en) * | 2007-12-21 | 2008-05-28 | 清华大学 | High resistance earthing fault detection method based on transient traveling wave |
| CN102854428A (en) * | 2011-06-28 | 2013-01-02 | 西门子公司 | Method and device for short circuit detection |
| CN102928728A (en) * | 2012-10-30 | 2013-02-13 | 清华大学 | High-resistance grounding fault detection method based on zero-sequence current waveform distortion convexity and concavity |
Non-Patent Citations (2)
| Title |
|---|
| 中性点不接地电网中的高阻接地故障;曾克娥 等;《水电能源科学》;20000930;第18卷(第3期);第41-43页 * |
| 基于分布参数模型的高压输电线路单相接地单端测距方法;林富洪 等;《电网技术》;20110430;第35卷(第4期);第201-205页 * |
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