CN102520300A - Circuit short-circuit fault detection method and system - Google Patents
Circuit short-circuit fault detection method and system Download PDFInfo
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- CN102520300A CN102520300A CN2011103709779A CN201110370977A CN102520300A CN 102520300 A CN102520300 A CN 102520300A CN 2011103709779 A CN2011103709779 A CN 2011103709779A CN 201110370977 A CN201110370977 A CN 201110370977A CN 102520300 A CN102520300 A CN 102520300A
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Abstract
The invention is applicable to the field of electronics, and provides a circuit short-circuit fault detection method and system. The method comprises the following steps of: monitoring circuit current; sampling current data according to a preset sampling interval and storing the current data in a buffer region; and when the circuit current changes to be 0, judging whether a circuit is subjected to a short-circuit fault according to current data in a preset time interval from the current time stored in the buffer region and preset fault judgment conditions. In the invention, by monitoring the circuit current, sampling the current data according to the preset sampling interval, storing the current data in the buffer region, and judging whether the circuit is subjected to the short-circuit fault according to the current data in the preset time interval from the current time stored in the buffer region and the preset fault judgment conditions when the circuit current changes to be 0, adaptive short-circuit fault detection is realized, the fault detection criterion structure is more rational and richer, the time complexity and the space complexity realized by the method are balanced, and the short-circuit fault of the circuit can be quickly and accurately judged.
Description
Technical field
The invention belongs to power domain, relate in particular to a kind of line short fault detection method and system.
Background technology
At present, be mainly flow pattern for the failure criterion of current mode short trouble indicator, the basis for estimation of crossing flow pattern is that the size of line current is judged.
The current mode short trouble has been widely used in the various distribution system; With the looped network distribution system is example; Particularly use in the system of ring net load switch in a large number; If in the next stage distribution network system short trouble or earth fault have taken place, the electric power system of upper level must be carried out disjunction in official hour, to prevent major accident.The maintenance personal can find the section that breaks down rapidly according to the alerting signal of this indicator, divide and break off fault section, thereby the power supply that in time recovers the non-fault section can be practiced thrift a large amount of working times, reduces power off time and power failure scope.
Prior art was when adopting the flow pattern criterion to carry out the line short fault detect; Because the criterion content is single; Break down the easily defectives such as probability height of indicator tripping and malfunction, how according to the variation of line current as the short trouble criterion, become the development trend of fault detector.
Summary of the invention
The object of the present invention is to provide a kind of line short fault detection method and system, when being intended to solve the detection of prior art conducting transmission line short trouble, indicating fault is omitted or the false drop rate problem of higher.
The present invention is achieved in that a kind of line short fault detection method, may further comprise the steps:
The Monitoring Line electric current according to preset SI sample rate current data, and is stored in said current data in the buffer area;
When line current becomes 0, according to the current data in the current time Preset Time section of preserving in the said buffer area and preset fault judgement condition judgment circuit failed because whether.
Another object of the present invention is to provide a kind of line short fault detection system, system comprises:
Monitoring means is used for the Monitoring Line electric current, according to preset SI sample rate current data;
Buffer unit is used for the current data of said monitoring means sampling is stored;
Judging unit is used for when line current becomes 0, and whether the current data in the current time Preset Time section of preserving according to said buffer unit and preset fault judgement condition judgment circuit failed because.
In the present invention; Through the Monitoring Line electric current,, and current data is stored in the buffer area according to preset SI sample rate current data; When line current becomes 0; According to the current data in the current time Preset Time section of preserving in the buffer area and preset fault judgement condition judgment circuit failed because whether, realize that the self-adaptation type short trouble detects, fault detect criterion structure is abundanter; Balance method time complexity and the space complexity realized, can judge the short trouble of circuit fast and accurately.
Description of drawings
Fig. 1 is the process flow diagram of the line short fault detection method that provides of the embodiment of the invention;
Fig. 2 is the synoptic diagram of the annular buffer area that provides of the preferred embodiment of the present invention;
Fig. 3 is the process flow diagram of the line short fault detection method that provides of example of the present invention;
Fig. 4 (a) and (b), (c), (d), (e), (f) are respectively the line current characteristic synoptic diagram to be measured that six examples of the present invention provide;
Fig. 5 is the structural drawing of the line short fault detection system that provides of the embodiment of the invention.
Embodiment
In order to make the object of the invention, technical scheme and beneficial effect clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The embodiment of the invention is through the Monitoring Line electric current; According to preset SI sample rate current data; And current data is stored in the buffer area; When line current becomes 0, according to the current data in the current time Preset Time section of preserving in the buffer area and preset fault judgement condition judgment circuit failed because whether.
Fig. 1 shows the process flow diagram of the line short detection method that the embodiment of the invention provides;
In step S101, the Monitoring Line electric current according to preset SI sample rate current data, and is stored in current data in the buffer area.
When concrete the realization, current data is a sampling time current corresponding value,
In step S101, before the Monitoring Line electric current, preserve the data in certain hour or the scope for ease, the line short fault detection method also comprises step:
Make up the buffer area of the current data in the circulation storage Preset Time section,
Wherein, the current value memory length is relevant with the concrete data of processing.For example, when the AD sampled data was 10, the current value memory length can be set at 2 bytes, and when the AD sampled data was 24, the current value memory length can be set at 3 bytes, so analogizes, and no longer enumerates at this.
In step S102, when line current becomes 0, according to the current data in the current time Preset Time section of preserving in the buffer area and preset fault judgement condition judgment circuit failed because whether.
The line current vanishing is the necessary non-adequate condition of circuit failed because, and the time point during the line current vanishing is fault judgement triggered time point.
During concrete the realization, in one embodiment of the invention, the fault judgement condition is specially:
In the Preset Time section:
Condition 1:I={I
1, I
2..., I
n, there is I among the I
i>=I
Set, i≤n;
Condition 2: Δ I>=α I
0
In the condition 1, I representes current data set, I
nBe n sampling time current corresponding value, I
SetExpression fault judgement starting current empirical value;
In the condition 2, Δ I representes jump-value of current in the Δ t, T
1≤Δ t≤T
2, α representes jump-value of current parameter, I
0Circuit is with reference to normal current before the expression current break, and wherein, Δ t representes mutation current duration, T
1Expression mutation current duration lower limit, T
2The expression mutation current duration upper limit, α, T
1, T
2Rule of thumb value is set.
Specifically, common T
1Relevant with the processing power of method device therefor with design specification, T
2Relevant with the line fault current characteristics.The span of α will be confirmed according to the fault current characteristics of circuit ruuning situation when breaking down, and for example can be 1/2.
In another embodiment, the fault judgement condition also can be:
In the Preset Time section:
Condition, 3:I={I
1, I
2..., I
n, there is I among the I
i>=I
Set, i≤n;
Condition 4:I
Max>=β I
Min, (β=α+1);
In the condition 3, I representes current data set, I
nBe n sampling time current corresponding value, I
SetExpression fault judgement starting current empirical value;
In the condition 4, I
MaxFor maximal value among the I, work as I
Min>=I
SetThe time, I
MinFor minimum value among the I, work as I
Min≤I
SetThe time, I
Min=I
Set, β representes the jump-value of current parameter, rule of thumb value is set.
Two kinds of fault judgement conditions that above-mentioned two embodiment propose are investigated its foundation, and essence is identical, can take wherein a kind of mode according to reality.
Which mode no matter above-mentioned fault judgement condition adopt, among the step S102 according to the current data in the current time Preset Time section of preserving in the buffer area and preset fault judgement condition judgment circuit whether the step of failed because be specially:
When the current data in the current time Preset Time section of preserving in the buffer area satisfies all conditions of fault judgement condition simultaneously, promptly condition 1 and condition 2 when perhaps condition 3 is with condition 4, judge that then circuit is a short trouble.
Line current can be in the heavy-duty service state under special circumstances; The short trouble determination methods that the embodiment of the invention provides is equally applicable to high load capacity or underload line normal power down situation; When line current is heavy-duty service; T2 is in the time before circuit outage, and whether the failed because step is with the fault judgement condition judgment circuit of presetting according to the current data in the current time Preset Time section of preserving in the buffer area among the step S102:
When the line current amplitude fluctuation satisfies the condition 2 of above-mentioned fault judgement condition, and the current peak before the circuit outage is then judged the circuit failed because when being higher than circuit heavy-duty service current peak;
When the current peak before the circuit power down is less than or equal to the heavy-duty service current peak, judge that then circuit does not have failed because.
In the preferred embodiment of the present invention; Buffer area is annular buffer area; The current data of circuit in the storage Preset Time section, it is the synoptic diagram of the annular buffer area that provides of the preferred embodiment of the present invention that Fig. 2 shows, annular buffer area has been preserved in the current data in the Preset Time section and has been comprised required I
Max, I
Min, along with the propelling of time, stale data can be covered by latest data.
Fig. 3 shows the process flow diagram of the line short fault detection method that example of the present invention provides.
In example of the present invention, adopt annular buffer area that current data is carried out buffer memory, I
SetRule of thumb be worth setting in advance with β, the demonstration judged result is reminded when detecting short trouble in the current slot, when not detecting short trouble, directly gets into the line short testing process of following a period of time.
Among the step S301, travel through annular buffer area, find out lowest high-current value I
Max
In step S302, judge whether annular buffer area exists current value greater than I
Set, be execution in step S303 then, otherwise accomplish this testing process;
In step S303, add 1 beginning from annular buffer area latest data position, travel through to lowest high-current value I
MaxThe preceding minimum current value I of lowest high-current value is found out in the position
Min
In step S304, judge I
MinWhether greater than I
Set, be execution in step S306 then, otherwise execution in step S305;
In step S305, set I
Min=I
Set
In step S306, judge whether I
Max>=β I
Min, be execution in step S307 then, otherwise accomplish this testing process;
Wherein, (β=α+1), the span of α is confirmed according to the fault current characteristics of circuit ruuning situation when breaking down.
In step S307, judge the circuit failed because.
Usually, during distribution line failure, line current generally has following Changing Pattern: 1. from the running current fault current of uprushing; 2. higher level's isolating switch or current protective device can drive the fuse failure (so before this action was accomplished, the barrier electric current can be kept a period of time) of circuit breaker trip or fuse; 3. line outage, electric current and voltage drop to zero.
Fig. 4 (a) and (b) show in the Preset Time section that two examples of the present invention provide and are judged to be short trouble circuit current corresponding characteristic synoptic diagram.
This is the current characteristics synoptic diagram of two kinds of common short troubles, and the current value of two figure is through I
Set, lowest high-current value I
MaxWith minimum current value I
MinSatisfy I
Max>=β I
Min, this time period circuit is judged as short trouble, wherein.
Fig. 4 (c), (d) show in the Preset Time section that two examples of the present invention provide and are judged to be not failed because circuit current corresponding characteristic synoptic diagram.
Because current value is all less than I among Fig. 4 (c)
Set, lowest high-current value I among Fig. 4 (d)
MaxWith minimum current value I
MinDifference is little, does not satisfy I
Max>=β I
Min, no matter be high load capacity or underload line normal power down, two figure time corresponding section circuits all can not be judged to be short trouble.
Fig. 4 (e) shows in the Preset Time section that example of the present invention provides and is judged to be short trouble circuit current corresponding characteristic synoptic diagram under the line current heavy-duty service condition.
T2 was in the time before Fig. 4 (e) was presented at the circuit outage, and line current has fluctuation by a relatively large margin, and promptly fluctuating range satisfies the above-mentioned condition 4 of formula, and current peak when the current peak before the circuit power down is higher than the circuit heavy-duty service is judged as short trouble.
Parameter beta=α+1 among above-mentioned figure (a) and (b), (c), (d), wherein, the span of α is an empirical value, confirms according to the fault current characteristics of circuit ruuning situation when breaking down.
The interior line current of Preset Time section that Fig. 4 (f) shows example of the present invention to be provided is judged to be no short trouble circuit current corresponding characteristic synoptic diagram under the heavy-duty service condition.
Fig. 4 (f) is different with Fig. 4 (e), and current peak when the current peak before the circuit power down is lower than heavy-duty service can not be judged as short trouble.
The embodiment of the invention is a starting point through self-adaptation criterion principle; Choose reasonable is judged the trigger point; Reduced meaningless resource consumption, take all factors into consideration and balance method time complexity and the space complexity realized, can rapidly and efficiently judge short circuit line.
Fig. 5 shows the structural drawing of the line short fault detection system that the embodiment of the invention provides.For the ease of explanation, only show relevant portion with the embodiment of the invention.This line short fault detection system can be the unit that the software unit, hardware cell or the software and hardware that are built in power device combines, and perhaps is integrated in the application system of power device as suspension member independently.
In embodiments of the present invention, the line short fault detection system mainly comprises monitoring means 51, buffer unit 52 and judging unit 53.Wherein, Monitoring means 51 Monitoring Line electric currents; According to preset SI sample rate current data; Buffer unit 52 is stored the current data of monitoring means 51 sampling, and judging unit 53 is when line current becomes 0, according to buffer unit 52 current data in the current time Preset Time section of preserving and the fault judgement condition judgment circuit of presetting failed because whether.
In the preferred embodiment of the present invention; Buffer unit 52 is specially annular buffer area,
Wherein, in one embodiment of the invention, the fault judgement condition is specially:
In the Preset Time section:
Condition 1:I={I
1, I
2..., I
n, there is I among the I
i>=I
Set, i≤n;
Condition 2: Δ I>=α I
0
In the condition 1, I representes current data set, I
nBe n sampling time current corresponding value, I
SetExpression fault judgement starting current empirical value;
In the condition 1, Δ I representes jump-value of current in the Δ t, T
1≤Δ t≤T
2, α representes jump-value of current parameter, I
0Circuit is with reference to normal current before the expression current break, and wherein, Δ t representes mutation current duration, T
1Expression mutation current duration lower limit, T
2The expression mutation current duration upper limit, α, T
1, T
2Rule of thumb value is set.
In another embodiment, the fault judgement condition is specially:
In the Preset Time section:
Condition 3:I={I
1, I
2..., I
n, there is I among the I
i>=I
Set, i≤n;
Condition 4:I
Max>=β I
Min, (β=α+1);
In the condition 3, I representes current data set, I
nBe n sampling time current corresponding value, I
SetExpression fault judgement starting current empirical value;
In the condition 4, I
MaxFor maximal value among the I, work as I
Min>=I
SetThe time, I
MinFor minimum value among the I, work as I
Min≤I
SetThe time, I
Min=I
Set, β representes the jump-value of current parameter, rule of thumb value is set.，
Two kinds of fault judgement conditions that above-mentioned two embodiment propose are investigated its foundation, and essence is identical, can take wherein a kind of mode according to reality.
The line short fault detection system that the embodiment of the invention provides is applicable to various situation, comprises high load capacity or underload line normal power down situation, and judging unit 52 specifically comprises:
First judge module is used for when the current data in current time Preset Time section that buffer unit is preserved satisfies all conditions of fault judgement condition simultaneously, and the judgement circuit is a short trouble;
Second judge module; Being used for working as circuit is heavy-duty service, the current data in current time Preset Time section of preserving in the buffer unit, if the line current amplitude fluctuation satisfies the condition 2 or the condition 4 of fault judgement condition; And when the current peak before the circuit outage is higher than circuit heavy-duty service current peak; Then judge the circuit failed because,, judge that then circuit does not have failed because if the current peak before the circuit power down is less than or equal to the heavy-duty service current peak.
Concrete implementation repeats no more at this as stated.
The embodiment of the invention; Through making up buffer area, through be provided with based on adaptive criterion trigger point and condition, realized carrying out the line short fault detect through the self-adaptation criterion; Reduced meaningless resource consumption, can rapidly and efficiently judge short circuit line.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to accomplish through program; Described program can be stored in the computer read/write memory medium; Described storage medium is like ROM/RAM, disk, CD etc.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a line short fault detection method is characterized in that, said method comprising the steps of:
The Monitoring Line electric current according to preset SI sample rate current data, and is stored in said current data in the buffer area;
When line current becomes 0, according to the current data in the current time Preset Time section of preserving in the said buffer area and preset fault judgement condition judgment circuit failed because whether.
2. method as claimed in claim 1 is characterized in that, said current data is a sampling time current corresponding value, and before said step Monitoring Line electric current, said method also comprises:
Make up the buffer area of the current data in the circulation storage Preset Time section; Said buffer area is annular buffer area,
3. method as claimed in claim 2 is characterized in that, said fault judgement condition is specially: in said Preset Time section:
Condition 1:I={I
1, I
2..., I
n, there is I among the I
i>=I
Set, i≤n;
Condition 2: Δ I>=α I
0
In the condition 1, I representes current data set, I
nBe n sampling time current corresponding value, I
SetExpression fault judgement starting current empirical value;
In the condition 2, Δ I representes jump-value of current in the Δ t, T
1≤Δ t≤T
2, α representes jump-value of current parameter, I
0Circuit is with reference to normal current before the expression current break, and wherein, Δ t representes mutation current duration, T
1Expression mutation current duration lower limit, T
2The expression mutation current duration upper limit, α, T
1, T
2Rule of thumb value is set.
4. method as claimed in claim 2 is characterized in that, said fault judgement condition is specially: in said Preset Time section:
Condition 3:I={I
1, I
2..., I
n, there is I among the I
i>=I
Set, i≤n;
Condition 4:I
Max>=β I
Min, (β=α+1);
In the condition 3, I representes current data set, I
nBe n sampling time current corresponding value, I
SetExpression fault judgement starting current empirical value;
In the condition 4, I
MaxFor maximal value among the I, work as I
Min>=I
SetThe time, I
MinFor minimum value among the I, work as I
Min≤I
SetThe time, I
Min=I
Set, β representes the jump-value of current parameter, α rule of thumb is worth setting.
5. like claim 3 or 4 described methods, it is characterized in that, said according to the current data in the current time Preset Time section of preserving in the said buffer area and preset fault judgement condition judgment circuit whether the step of failed because be specially:
When the current data in current time Preset Time section of preserving in the said buffer area satisfies all conditions of said fault judgement condition simultaneously, judge that then circuit is a short trouble.
6. method as claimed in claim 3; It is characterized in that; When circuit is heavy-duty service; T2 is in the time before circuit outage, and said whether the failed because step also comprises with the fault judgement condition judgment circuit of presetting according to the current data in the current time Preset Time section of preserving in the said buffer area:
When the line current amplitude fluctuation satisfies the condition 2 of said fault judgement condition, and the current peak before the circuit outage is then judged the circuit failed because when being higher than circuit heavy-duty service current peak;
When the current peak before the circuit power down is less than or equal to the heavy-duty service current peak, judge that then circuit does not have failed because.
7. a line short fault detection system is characterized in that, said system comprises:
Monitoring means is used for the Monitoring Line electric current, according to preset SI sample rate current data;
Buffer unit is used for the current data of said monitoring means sampling is stored;
Judging unit is used for when line current becomes 0, and whether the current data in the current time Preset Time section of preserving according to said buffer unit and preset fault judgement condition judgment circuit failed because.
8. system as claimed in claim 7; It is characterized in that; Said buffer unit is annular buffer area,
9. system as claimed in claim 7 is characterized in that, said fault judgement condition is specially:
In said Preset Time section:
Condition 1:I={I
1, I
2..., I
n, there is I among the I
i>=I
Set, i≤n;
Condition 2: Δ I>=α I
0
In the condition 1, I representes current data set, I
nBe n sampling time current corresponding value, I
SetExpression fault judgement starting current empirical value;
In the condition 2, Δ I representes jump-value of current in the Δ t, T
1≤Δ t≤T
2, α representes jump-value of current parameter, I
0Circuit is with reference to normal current before the expression current break, and wherein, Δ t representes mutation current duration, T
1Expression mutation current duration lower limit, T
2The expression mutation current duration upper limit, α, T
1, T
2Rule of thumb value is set; Perhaps
Said fault judgement condition is specially:
In said Preset Time section:
Condition 3:I={I
1, I
2..., I
n, there is I among the I
i>=I
Set, i≤n;
Condition 4:I
Max>=β I
Min, (β=α+1);
In the condition 3, I representes current data set, I
nBe n sampling time current corresponding value, I
SetExpression fault judgement starting current empirical value;
In the condition 4, I
MaxFor maximal value among the I, work as I
Min>=I
SetThe time, I
MinFor minimum value among the I, work as I
Min≤I
SetThe time, I
Min=I
Set, β representes the jump-value of current parameter, α rule of thumb is worth setting.
10. system as claimed in claim 9 is characterized in that, said judging unit specifically comprises:
First judge module is used for when the current data in current time Preset Time section that said buffer unit is preserved satisfies all conditions of said fault judgement condition simultaneously, and the judgement circuit is a short trouble;
Second judge module; Being used for working as circuit is heavy-duty service; The current data in current time Preset Time section of preserving in the said buffer unit; If the line current amplitude fluctuation satisfies the condition 2 or the condition 4 of said fault judgement condition, and the current peak before the circuit outage is then judged the circuit failed because when being higher than circuit heavy-duty service current peak; If the current peak before the circuit power down is less than or equal to the heavy-duty service current peak, judge that then circuit does not have failed because.
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|---|---|---|---|
| CN201110370977.9A CN102520300B (en) | 2011-11-21 | 2011-11-21 | A kind of circuit short-circuit fault detection method and system |
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|---|---|---|---|
| CN201110370977.9A CN102520300B (en) | 2011-11-21 | 2011-11-21 | A kind of circuit short-circuit fault detection method and system |
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| CN102944804A (en) * | 2012-11-13 | 2013-02-27 | 航天科工深圳（集团）有限公司 | Overhead line fault detection system |
| CN103792460A (en) * | 2013-12-13 | 2014-05-14 | 福建奥通迈胜电力科技有限公司 | Short-circuiting fault monitoring circuit of fault indicator |
| CN104155566A (en) * | 2014-09-02 | 2014-11-19 | 国网河北故城县供电公司 | Method for finding tripping of distribution network switches in time |
| CN104635108A (en) * | 2014-12-24 | 2015-05-20 | 国家电网公司 | Current abrupt change display method and device |
| CN105681653A (en) * | 2016-01-12 | 2016-06-15 | 深圳市云智易联科技有限公司 | Video file generation method and device |
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| CN108646146A (en) * | 2018-08-20 | 2018-10-12 | 国网河北省电力有限公司沧州供电分公司 | Distribution wire On-line Fault monitoring method and terminal device |
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| CN113253151A (en) * | 2021-06-16 | 2021-08-13 | 上海芯龙半导体技术股份有限公司 | Short circuit detection circuit, short circuit protection circuit and chip |
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| CN104635108A (en) * | 2014-12-24 | 2015-05-20 | 国家电网公司 | Current abrupt change display method and device |
| CN106291394A (en) * | 2015-05-19 | 2017-01-04 | 上海航天有线电厂有限公司 | The real-time Wave record method of fault moment of a kind of Modular UPS and system |
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| CN108646146A (en) * | 2018-08-20 | 2018-10-12 | 国网河北省电力有限公司沧州供电分公司 | Distribution wire On-line Fault monitoring method and terminal device |
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| CN113253151B (en) * | 2021-06-16 | 2021-10-01 | 上海芯龙半导体技术股份有限公司 | Short circuit detection circuit, short circuit protection circuit and chip |
| CN116990622A (en) * | 2023-09-26 | 2023-11-03 | 国网辽宁省电力有限公司电力科学研究院 | Fault wave recording method, device, equipment and medium of transformer substation direct current system |
| CN116990622B (en) * | 2023-09-26 | 2023-12-15 | 国网辽宁省电力有限公司电力科学研究院 | Fault wave recording method, device, equipment and medium of transformer substation direct current system |
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