CN102798803B - Method for detecting line fault of power distribution network - Google Patents
Method for detecting line fault of power distribution network Download PDFInfo
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- CN102798803B CN102798803B CN201210291083.5A CN201210291083A CN102798803B CN 102798803 B CN102798803 B CN 102798803B CN 201210291083 A CN201210291083 A CN 201210291083A CN 102798803 B CN102798803 B CN 102798803B
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Abstract
The invention provides a method for detecting a line fault of a power distribution network. The method comprises the steps of: sampling current signals of A phase, B phase and C phase on a line of a power distribution network to obtain current values of the three phases; respectively calculating current differential values among the three phases of circuits according to the current values; judging a current differential value by utilizing a preset first parameter threshold, and detecting the ground electric fields of the three phases of circuits to obtain ground electric field values of the three phases if the current differential value is greater than the first parameter threshold; and judging the ground electric field values by utilizing a preset second parameter threshold, and judging that a grounding fault occurs in line of the power distribution network and controlling a fault indicator to send out a grounding fault alarm signal if the ground electric field values are less than the second parameter threshold. According to the technology of the invention, the method for detecting the line fault of the power distribution network, disclosed by the invention, has the advantages of improving detection accuracy for line fault, especially for grounding fault, decreasing probability of false alarm of the fault indicator, ensuring in-time maintenance of the line and improving reliability of the power supply of the power distribution network.
Description
Technical field
The present invention relates to electric power project engineering field, particularly relate to a kind of distribution network line fault detection method.
Background technology
Power distribution network has the features such as line construction complexity, environmental change is various, faults frequent is complicated, maintenance workload is large.A certain section of distribution line breaks down, need to investigate fault piecemeal and position occurs, at present, the circuit of power distribution network is generally all equipped with fault detector, these fault detectors pass through transfer function, data cube computation is carried out with monitoring center, tidal data recovering will be detected to monitoring center, determine abort situation after carrying out data processing and send corresponding alerting signal to carry out alarm, but due to the quantity of fault detector many, data volume is large, data carry out collecting and after carrying out respective handling again, extremely easily there is error, the accuracy of the fault detect of these error-reduction distribution lines, false alarm is caused to happen occasionally, delay emergency repair time, have impact on power supply reliability.
Summary of the invention
Based on this, be necessary easily to occur error for prior art, reduce the problem of the accuracy of the fault detect of distribution line, a kind of distribution network line fault detection method is provided.
A kind of distribution network line fault detection method, comprises the steps:
Distribution network line carries out sampling to the current signal of A, B, C three-phase and obtains the current value of three-phase;
The alternate current differential of three-phase line is calculated respectively according to described current value;
The first parameter threshold preset is utilized to judge described current differential, if described current differential is greater than described first parameter threshold, then to the electric field value over the ground earth electric field being carried out to detection acquisition three-phase of three-phase line;
Utilize the second parameter threshold preset judge described in electric field value over the ground, if described electric field value is over the ground less than described second parameter threshold, then judge that described distribution network line produces earth fault, and control fault detector and send earth fault alerting signal.
Above-mentioned distribution network line fault detection method, by the parameter threshold preset, judgement circuit three-phase current difference and to earth electric field difference, when current signal produces fluctuation, distribution network line carries out breakdown judge, decrease current data to collect, the error that transmission process brings, in conjunction with the current differential of three-phase line with carry out comprehensive descision to earth electric field difference, improve the accuracy of the line fault particularly detection of earth fault, , reduce the probability of fault detector false alarm, ensure that the timely repairing of circuit, improve the reliability that power distribution network is powered.
Accompanying drawing explanation
Fig. 1 is the distribution network line fault detection method process flow diagram of an embodiment.
Embodiment
Be described in detail below in conjunction with the embodiment of accompanying drawing to distribution network line fault detection method of the present invention.
Fig. 1 shows the distribution network line fault detection method process flow diagram of an embodiment, comprises the steps:
S100, distribution network line carries out sampling to the current signal of A, B, C three-phase obtains the current value of three-phase;
S200, calculates the alternate current differential of three-phase line respectively according to described current value;
S300, utilizes the first parameter threshold preset to judge described current differential, if described current differential is greater than described first parameter threshold, then to the electric field value over the ground earth electric field being carried out to detection acquisition three-phase of three-phase line;
S400, utilize the second parameter threshold preset judge described in electric field value over the ground, if described electric field value is over the ground less than described second parameter threshold, then judge that described distribution network line produces earth fault, and control fault detector and send earth fault alerting signal.
In order to the scheme of more clear distribution network line fault detection method of the present invention, set forth preferred embodiment below.
The setting of the first parameter threshold, the second parameter threshold, determines according to different classes of line condition, can use the statistic analysis result of historical failure data as a reference.
In one embodiment, for step S200, specifically comprise as follows:
First, Fourier algorithm is utilized to calculate the effective value I of A, B, C three-phase electricity flow valuve
a, I
b, I
c;
Then, according to described I
a, I
b, I
ccalculate the current differential that three-phase line is alternate, wherein, computation process comprises following formula:
In formula,
for the current differential that AB is alternate,
for the current differential that AC is alternate,
for the current differential that BC is alternate.
In one embodiment, for step S400, particularly, according to detecting the electric field value over the ground obtained in the second parameter threshold determining step S300 preset, be respectively constant relative to the voltage of ground (0 voltage) due to distribution network line under normal circumstances, so its over the ground electric field value should be greater than a parameter threshold, when line-to-ground fault, line voltage distribution decline, its over the ground electric field value diminish, when being less than the second parameter threshold, then can judge that circuit there occurs earth fault;
By above-mentioned steps, judge the failure condition of circuit further from voltage, improve the accuracy of fault detect.
In one embodiment, in order to improve the accuracy of Earth Fault Detection further, when distribution network line produces earth fault, distribution network line detects the zero sequence voltage component of A, B, C three-phase; Then the zero sequence voltage component of detection is uploaded to monitoring center; Judge that the amplitude of this zero sequence voltage component is whether in the amplitude threshold values preset, and if so, then sends earth fault alerting signal, if not, then sends fault detector abnormal alarm signal in monitoring center;
For normal distribution network line, symmetrical between its three-phase line, the amplitude of its zero sequence voltage component is zero, when circuit breaks down, causing between three-phase asymmetric, producing zero sequence voltage component, so the component by detecting this exception, each single-phase Grounding can be determined, thus detect earth fault; Meanwhile, when when the testing result of monitoring center's testing result and fault detector is inconsistent, judges that fault detector produces abnormal, achieve the monitoring to fault indicator state, decrease the false alarm situation of fault detector.
In one embodiment, consider that circuit generation current fluctuates, may be caused by open fault, carrying out in order to the open fault to distribution network line detects and alarm, before detection of ground faults, comprise further: according to A, B, C tri-phase sampler obtain current value judge whether there is open fault in A, B, C three-phase, if exist, then control fault detector send open fault alerting signal;
Particularly, can judge whether the current value of A, B, C three-phase is greater than the current threshold of setting, if not, then can judge that this single-phase circuit is as open circuit, wherein, the current threshold of above-mentioned setting is determined according to different classes of line condition.
In one embodiment, consider that circuit generation current fluctuates, may be caused by short trouble, carrying out in order to the short trouble to distribution network line detects and alarm, before detection of ground faults and after detection line do not exist open fault, comprise further: according to A, B, C tri-phase sampler obtain current value judge whether there is short trouble in A, B, C three-phase, if exist, then control fault detector send open fault alerting signal;
Particularly, judge whether each phase current values electric current occurs and uprushes, uprush if there is electric current, judge whether current value exceedes short circuit threshold values again, if exceed, then judge whether exceed short circuit threshold values exceedes the default short trouble duration further, if exceed, then judge that this circuit exists short trouble; Wherein, above-mentioned short circuit threshold values, short trouble duration determine according to different classes of line condition;
It should be noted that, short trouble detects and is not limited to before detection of ground faults and after detecting open fault, also can be set to other position and carry out.
In one embodiment, consider that circuit generation current fluctuates, may be caused by short trouble, carrying out in order to the short trouble to distribution network line detects and alarm, before detection of ground faults and after detection line do not exist open fault and short trouble, comprise further: according to A, B, C tri-phase sampler obtain current value judge whether there is over current fault in A, B, C three-phase, if exist, then control fault detector send over current fault alerting signal;
Particularly, judge whether each phase current values overcurrent occurs, if so, then judge whether to exceed the default over current fault duration, if exceed, then judge that this circuit exists over current fault; Wherein, the above-mentioned over current fault duration determines according to different classes of line condition;
It should be noted that, over current fault detects and is not limited to before detection of ground faults and after detecting open fault, also can be set to other position and carry out.
For alerting signal mentioned in above-described embodiment, include voice signal, image information or short message.
Distribution network line fault detection method of the present invention, combine line electricity flow valuve, to the detection of earth electric field and zero sequence voltage component, by the parameter threshold preset, allow to belong to the fluctuation of normal current capacity, occur that unusual condition is at current capacity simultaneously, can report to the police timely and accurately, in conjunction with open-circuit fault, short trouble, the evaluation algorithm of over current fault and earth fault, improve the warning accuracy of fault detector, in earth fault, further, can monitor the performance condition of fault detector in monitoring center, when there is false alarm in fault detector, monitoring center can send early warning in time, avoid the repairing that have impact on circuit because of the faults itself of fault detector.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (6)
1. a distribution network line fault detection method, is characterized in that, comprises the steps:
Distribution network line carries out sampling to the current signal of A, B, C three-phase and obtains the current value of three-phase;
The alternate current differential of three-phase line is calculated respectively according to described current value;
The first parameter threshold preset is utilized to judge described current differential, if described current differential is greater than described first parameter threshold, then to the electric field value over the ground earth electric field being carried out to detection acquisition three-phase of three-phase line;
Utilize the second parameter threshold preset judge described in electric field value over the ground, if described electric field value is over the ground less than described second parameter threshold, then judge that described distribution network line produces earth fault, and control fault detector and send earth fault alerting signal;
When described distribution network line produces earth fault, distribution network line detects the zero sequence voltage component of A, B, C three-phase;
Described zero sequence voltage component is uploaded to monitoring center;
Judge that the amplitude of described zero sequence voltage component is whether in the amplitude threshold values preset, and if so, then sends earth fault alerting signal, if not, then sends fault detector abnormal alarm signal in monitoring center.
2. distribution network line fault detection method according to claim 1, is characterized in that, comprises according to the current differential step that described current value calculates three-phase line alternate respectively:
Fourier algorithm is utilized to calculate the effective value I of A, B, C three-phase electricity flow valuve
a, I
b, I
c;
According to described I
a, I
b, I
ccalculate the current differential that three-phase line is alternate, comprise following formula:
In formula,
for the current differential that AB is alternate,
for the current differential that AC is alternate,
for the current differential that BC is alternate.
3. distribution network line fault detection method according to claim 1 and 2, it is characterized in that, also comprise: according to A, B, C tri-phase sampler obtain current value judge whether there is open fault in A, B, C three-phase, if exist, then control described fault detector and send open fault alerting signal.
4. distribution network line fault detection method according to claim 1 and 2, it is characterized in that, also comprise: according to A, B, C tri-phase sampler obtain current value judge whether there is short trouble in A, B, C three-phase, if exist, then control described fault detector and send open fault alerting signal.
5. distribution network line fault detection method according to claim 1 and 2, it is characterized in that, also comprise: according to A, B, C tri-phase sampler obtain current value judge whether there is over current fault in A, B, C three-phase, if exist, then control described fault detector and send over current fault alerting signal.
6. distribution network line fault detection method according to claim 1, is characterized in that, described alerting signal comprises voice signal, image information or short message.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104237732A (en) * | 2014-10-17 | 2014-12-24 | 国家电网公司 | Power transmission line fault judging/locating method |
| CN106443322B (en) * | 2016-08-31 | 2018-10-19 | 积成电子股份有限公司 | Fault detector failure judgment method based on maximum probability |
| CN106771660B (en) * | 2016-11-21 | 2019-07-16 | 国网四川省电力公司电力科学研究院 | A kind of project of transmitting and converting electricity power-frequency electric field strength measurement bracket performance measurement method |
| CN106682818A (en) * | 2016-12-12 | 2017-05-17 | 国网北京市电力公司 | Power distribution network information processing method and apparatus |
| CN106597227A (en) * | 2016-12-30 | 2017-04-26 | 北京鼎科远图科技有限公司 | Method and device for determining single-phase-to-ground fault based on global wavelet coefficient balance method |
| CN107167708A (en) * | 2017-06-28 | 2017-09-15 | 北京盈拓润达电气科技有限公司 | A kind of fault detection method, device, equipment and storage medium |
| CN111505441A (en) * | 2020-04-29 | 2020-08-07 | 国网湖南省电力有限公司 | Short-circuit fault judgment method and system for small-load current circuit and fault indicator |
| CN112881860B (en) * | 2021-01-18 | 2022-03-04 | 长沙理工大学 | Fault positioning method and system for power distribution network |
| CN113325264B (en) * | 2021-04-28 | 2022-03-18 | 威胜信息技术股份有限公司 | Power distribution network fault protection method based on self-adaptive differential grounding algorithm |
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| WO2012037947A1 (en) * | 2010-09-20 | 2012-03-29 | Technische Universität Dortmund | Method and system for fault detection on an electrical power transmission line |
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| CN1645704A (en) * | 2005-01-20 | 2005-07-27 | 长沙理工大学 | Single-phase gruonded fault protecting method for distributing net |
| CN2773704Y (en) * | 2005-03-29 | 2006-04-19 | 吕强 | Overhead grounded short-circuit fault indicator |
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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD. Address before: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation |