CN101706547B - Method for locating single-phase grounding fault by adopting transient state travelling wave and injection method - Google Patents
Method for locating single-phase grounding fault by adopting transient state travelling wave and injection method Download PDFInfo
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- CN101706547B CN101706547B CN2009101854249A CN200910185424A CN101706547B CN 101706547 B CN101706547 B CN 101706547B CN 2009101854249 A CN2009101854249 A CN 2009101854249A CN 200910185424 A CN200910185424 A CN 200910185424A CN 101706547 B CN101706547 B CN 101706547B
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000001052 transient effect Effects 0.000 title claims abstract description 15
- 238000002347 injection Methods 0.000 title claims abstract description 12
- 239000007924 injection Substances 0.000 title claims abstract description 12
- 230000009466 transformation Effects 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 4
- 230000018199 S phase Effects 0.000 claims description 3
- 230000004807 localization Effects 0.000 abstract description 11
- 230000007812 deficiency Effects 0.000 abstract description 3
- 230000007257 malfunction Effects 0.000 abstract description 3
- 230000007935 neutral effect Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000819 phase cycle Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
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Abstract
It is positioned using the method for locating single-phase ground fault of transient state travelling wave and injection method suitable for single-phase grounded malfunction in grounded system of low current,This method solve the deficiency of single failure localization method,The accuracy of the fault location of raising,Method includes the following steps: 1) residual voltage is sampled,Calculate and judge residual voltage whether be more than adjusting threshold value,Illustrate that power grid has singlephase earth fault if being more than,In turn,It follows the steps below,It is 2) regular according to voltage change when system single-phase fault,Judge the phase that is out of order,Then the phase voltage of fault moment is obtained
Compared with 0.8up, wherein up be system phase voltage peak value, 3) if
Wavelet analysis is carried out to transient state travelling wave signal, determines the round-trip fault point of traveling wave and the primary time Δ t of bus, so that distance of the fault point away from bus is calculated, 4) if
Faulty line is then selected, has a power failure to faulty line, to faulty line injected pulse signal and carries out wavelet transformation, the back wave of fault inspecting obtains Δ t, calculates distance of the fault point away from bus.
Description
Technical field
The present invention relates to the method for locating single-phase ground fault of small current neutral grounding system transient state travelling wave and injection method.
Background technology
The single-phase grounded malfunction in grounded system of low current localization method mainly contains traveling wave method, S injection method etc. at present.The ripple localization method of wherein going is only utilized the transient state travelling wave signal in very short time at earth fault initial stage; The fault progression in earth fault later stage is to the not influence of transient state travelling wave signal in when beginning; So row ripple localization method is all effective under situation such as transient earthing, intermittent arc grounding; Simultaneously traveling wave method does not receive the influence of factors such as transition resistance and circuit be asymmetric, and is all suitable to various circuits.But when fault occurs in the phase voltage initial angle is near zero the time, and traveling-wave component is very little, can not effectively detect the capable ripple of fault generating, makes the travelling wave positioning method inefficacy.The signal injection method has good dirigibility, and is applied widely.But the localization of fault scheme based on injection method mainly adopts artificial line walking at present, by the hand-held signal sensor of operating personnel, searches earth point along the faulty line tour.This method trouble-shooting point spended time is longer, and the 2nd of initiating system the ground connection is caused the circuit automatic trip during this period.
Summary of the invention
Technical matters: the object of the invention provides a kind of method for locating single-phase ground fault that adopts transient state travelling wave and injection method; Be applicable to the single-phase grounded malfunction in grounded system of low current location; This method has solved the deficiency of single failure localization method, the accuracy of the localization of fault of raising.
Technical scheme: for realizing above-mentioned purpose, the present invention adopts the method for locating single-phase ground fault of transient state travelling wave and injection method to comprise:
1) sampling residual voltage, calculating also judges whether residual voltage surpasses the threshold value of adjusting, and then explains that electrical network has singlephase earth fault if surpass, and then, carry out following steps
The change in voltage rule is judged the fault phase during 2) according to system's single-phase fault, obtains this phase phase voltage of fault moment then
With 0.8u
pCompare, wherein u
pBe system's phase voltage peak value.
3) if
carries out wavelet analysis to the transient state travelling wave signal; Confirm that the row ripple comes and goes trouble spot and bus time Δ t once, thereby calculate the distance of trouble spot apart from bus.
4) if
then selects faulty line; Faulty line is had a power failure; To faulty line injected pulse signal and carry out wavelet transformation; The reflection wave of detection failure point obtains Δ t, calculates the distance of trouble spot apart from bus.
Beneficial effect: the present invention provides a kind of method for locating single-phase ground fault that adopts transient state travelling wave and injection method; This method is according to the difference of fault branch ground connection phase place; Reasonably select to use the information of circuit self or injection signal to carry out localization of fault, overcome single localization method and caused the inaccurate deficiency in location easily.This method is high to singlephase earth fault locating accuracy in the small current neutral grounding system, adopts wavelet analysis to replace the conventional artificial detection method behind the injected pulse signal, realizes stable performance and do not receive the influence of the method for operation easily with DSP.
Description of drawings
Fig. 1 is the process flow diagram of fault localization method.
Embodiment
Below in conjunction with Fig. 1 practical implementation step of the present invention is described:
1. use the real-time synchronized sampling residual voltage of zero sequential potential transformer; The residual voltage instantaneous amplitude that calculating sampling obtains; Judge whether residual voltage surpasses the threshold value of adjusting; If surpass the generation singlephase earth fault is described then, is carried out following steps, otherwise just continue to calculate the residual voltage instantaneous amplitude and compare in the threshold value of adjusting.
2. dependence failure wave-recording, change in voltage rule during according to system's single-phase fault, promptly isolated neutral system is single-phase judges that when the transition resistance eutral grounding rule of ground connection phase is: be benchmark with positive phase sequence, the voltage-to-ground hysteresis of high phase is the ground connection phase mutually; Judge that the rule of ground connection phase is during through the transition resistance eutral grounding through arc suppression coil earthing system is single-phase: be benchmark with positive phase sequence still, identical with isolated neutral system during under-compensation: and during over-compensation, the voltage-to-ground leading phase of high phase is the ground connection phase.Judge the fault phase, obtain the phase voltage of fault moment then by voltage transformer (VT)
With 0.8u
pCompare, wherein u
pBe system's phase voltage maximal value.
3. use DSP, high-speed, multi-path A/D conversion chip is sampled to the current signal of circuit, after judging the fault generation, if
Then to the transient current travelling waves signal that obtains with (software filtering) filtering of Wiener filtering technology after; Use the Db6 small echo to carry out wavelet analysis; Have the characteristics of detection signal sudden change according to wavelet transformation, can obtain the moment that the current traveling wave signal at trouble spot and bus place reflection takes place, the adjacent modulus maximum of corresponding wavelet transformation; Thereby calculate the used time Δ t of current traveling wave round trip between trouble spot and bus, velocity of wave does
Can the localization of faults be: X to the distance of bus
L=v* Δ t/2=v* (t
2-t
1)/2.
4. if
then selects faulty line and has a power failure; To faulty line injected pulse signal; Use DSP; High-speed, multi-path A/D conversion chip is sampled to the current signal of circuit, carries out the noise filtering of signal, carries out the reflection wave that wavelet transformation comes detection failure point with the Db6 small echo; Calculate the used time Δ t of current traveling wave round trip between trouble spot and bus, thereby calculate the distance of trouble spot apart from bus.
Claims (1)
1. method for locating single-phase ground fault that adopts transient state travelling wave and injection method is characterized in that this method may further comprise the steps:
1) sampling residual voltage, calculating also judges whether residual voltage surpasses the threshold value of adjusting, and then explains that electrical network has singlephase earth fault if surpass, and then, carry out following steps,
The change in voltage rule is judged the fault phase during 2) according to system's single-phase fault, obtains the phase voltage of fault moment then
With 0.8u
pCompare, wherein u
pBe system's phase voltage peak value,
3) if
carries out wavelet analysis to the transient state travelling wave signal; Confirm that the row ripple comes and goes trouble spot and bus time Δ t once; Thereby calculate the distance of trouble spot apart from bus
(4) if
then selects faulty line; Faulty line is had a power failure; To faulty line injected pulse signal and carry out wavelet transformation; The reflection wave of detection failure point obtains Δ t, calculates the distance of trouble spot apart from bus; Δ t calculates current traveling wave used time of round trip between trouble spot and bus.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101854249A CN101706547B (en) | 2009-11-09 | 2009-11-09 | Method for locating single-phase grounding fault by adopting transient state travelling wave and injection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101854249A CN101706547B (en) | 2009-11-09 | 2009-11-09 | Method for locating single-phase grounding fault by adopting transient state travelling wave and injection method |
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| CN101706547A CN101706547A (en) | 2010-05-12 |
| CN101706547B true CN101706547B (en) | 2012-01-04 |
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Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101943737B (en) * | 2010-08-04 | 2012-10-24 | 清华大学 | Single-phase earth fault diagnosis method and device |
| CN101915884B (en) * | 2010-08-13 | 2012-05-23 | 苏州市电通电力电子有限公司 | Identification method of ground fault phases in three-phase ungrounded system and identification device thereof |
| CN102221660B (en) * | 2011-03-18 | 2013-08-21 | 华北电力大学 | On-line positioner of small current earth fault |
| CN103123389A (en) * | 2011-11-21 | 2013-05-29 | 甘肃省电力公司定西供电公司 | Method for verifying polarity of zero-sequence current transformer |
| CN102590700B (en) * | 2011-12-23 | 2015-09-30 | 国家电网公司 | Based on pole line fast fault locating method and the device of time synchronized |
| CN103293449B (en) * | 2012-12-31 | 2015-04-29 | 中国矿业大学 | Method for removing single-terminal traveling wave fault location dead area of high-voltage power grid in coal mine |
| CN103176103B (en) * | 2013-03-15 | 2015-08-12 | 华北电力大学 | A kind of overhead distribution method for locating single-phase ground fault |
| CN103217625B (en) * | 2013-03-20 | 2015-03-11 | 山东理工大学 | Low current earth fault location method based on transient state current waveform comparison |
| CN103809082B (en) * | 2014-02-17 | 2016-06-22 | 四川大学 | A kind of distance-finding method of the one-phase earthing failure in electric distribution network based on the sudden change of line line ripple |
| CN104330708B (en) * | 2014-11-25 | 2017-02-22 | 中国矿业大学 | Fault location method for wide area traveling wave signal below power grid |
| CN106019088B (en) * | 2016-05-17 | 2018-11-23 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of direct current grounding pole route distance measuring method |
| CN106771885A (en) * | 2017-02-13 | 2017-05-31 | 武汉随戈科技服务有限公司 | A kind of distribution network failure searches equipment |
| CN108693446B (en) * | 2018-05-25 | 2019-05-17 | 中国矿业大学 | A kind of Fault Locating Method of non-synchronous sampling power grid transient state travelling wave modulus time difference |
| CN109541401B (en) * | 2018-12-29 | 2021-02-02 | 上海仁童电子科技有限公司 | Cable detection method and device and electronic equipment |
| CN110568312A (en) * | 2019-09-11 | 2019-12-13 | 中南大学 | Phase current distortion-based single-phase earth fault line selection method for neutral point ungrounded system |
| CN113533907B (en) * | 2021-08-30 | 2023-12-08 | 国网江苏省电力有限公司宿迁供电分公司 | Small-resistance grounding distribution network fault positioning method based on zero-sequence voltage distribution characteristics |
| CN114167213A (en) * | 2021-11-29 | 2022-03-11 | 国网江苏省电力有限公司扬州供电分公司 | Flexible direct-current distribution line fault positioning method based on traveling waves |
| CN118011148A (en) * | 2021-12-09 | 2024-05-10 | 安徽三联学院 | Method for judging ground fault in secondary power transformation system |
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