CN101706547A - 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
- Publication number
- CN101706547A CN101706547A CN200910185424A CN200910185424A CN101706547A CN 101706547 A CN101706547 A CN 101706547A CN 200910185424 A CN200910185424 A CN 200910185424A CN 200910185424 A CN200910185424 A CN 200910185424A CN 101706547 A CN101706547 A CN 101706547A
- Authority
- CN
- China
- Prior art keywords
- fault
- phase
- bus
- voltage
- transient state
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Locating Faults (AREA)
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
, then faulty line is 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 situations such as transient earthing, intermittent arc grounding, simultaneously traveling wave method is not subjected to the influence of factors such as transition resistance and circuit be asymmetric, and various circuits all are suitable for.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 that fault produces, and 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 achieving the above object, 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 illustrates 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
The transient state travelling wave signal is carried out wavelet analysis, determine 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 select 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 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 to singlephase earth fault locating accuracy height in the small current neutral grounding system, adopts wavelet analysis to replace traditional artificial detection method behind the injected pulse signal, realizes stable performance and be not subjected to 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 concrete 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 surpassing then, singlephase earth fault takes place in explanation, carry 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
After then the transient current travelling waves signal that obtains being used Wiener filtering technology (software filtering) filtering, use the Db6 small echo to carry out wavelet analysis, the characteristics that have the detection signal sudden change according to wavelet transformation, can obtain the moment that reflection takes place at trouble spot and bus place the current traveling wave signal, 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 is
Can the localization of faults be: X to the distance of bus
L=v* Δ t/2=v* (t
2-t
1)/2.
If
Then select faulty line and 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, carry out the noise filtering of signal, carry 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 illustrates 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
The transient state travelling wave signal is carried out wavelet analysis, determines 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 select 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101706547A true CN101706547A (en) | 2010-05-12 |
| CN101706547B CN101706547B (en) | 2012-01-04 |
Family
ID=42376786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101854249A Expired - Fee Related CN101706547B (en) | 2009-11-09 | 2009-11-09 | Method for locating single-phase grounding fault by adopting transient state travelling wave and injection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101706547B (en) |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101915884A (en) * | 2010-08-13 | 2010-12-15 | 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 |
| CN101943737A (en) * | 2010-08-04 | 2011-01-12 | 清华大学 | Single-phase earth fault diagnosis method and device |
| CN102221660A (en) * | 2011-03-18 | 2011-10-19 | 华北电力大学 | On-line positioner of small current earth fault |
| CN102590700A (en) * | 2011-12-23 | 2012-07-18 | 山东电力集团公司淄博供电公司 | Method and device for quickly locating faults of overhead line on basis of time synchronization |
| 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 |
| CN103176103A (en) * | 2013-03-15 | 2013-06-26 | 华北电力大学 | Overhead power distribution line single-phase grounding fault positioning method |
| CN103217625A (en) * | 2013-03-20 | 2013-07-24 | 山东理工大学 | Low current earth fault location method based on transient state current waveform comparison |
| CN103293449A (en) * | 2012-12-31 | 2013-09-11 | 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 |
| CN103809082A (en) * | 2014-02-17 | 2014-05-21 | 四川大学 | Distance measurement method for power distribution network single-phase earth fault on the basis of aerial mode traveling wave mutation |
| CN104330708A (en) * | 2014-11-25 | 2015-02-04 | 中国矿业大学 | Fault location method for wide area traveling wave signal below power grid |
| CN106019088A (en) * | 2016-05-17 | 2016-10-12 | 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 | DC earth electrode line fault location 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 |
| CN108693446A (en) * | 2018-05-25 | 2018-10-23 | 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 |
| CN109541401A (en) * | 2018-12-29 | 2019-03-29 | 上海仁童电子科技有限公司 | Cable detection method, 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 |
| CN113533907A (en) * | 2021-08-30 | 2021-10-22 | 国网江苏省电力有限公司宿迁供电分公司 | Fault positioning method for small-resistance grounding power distribution network based on zero-sequence voltage distribution characteristics |
| CN114062970A (en) * | 2021-12-09 | 2022-02-18 | 安徽三联学院 | Low-current ground fault line selection method and device based on secondary power transformation system |
| 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 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1673764A (en) * | 2004-12-17 | 2005-09-28 | 魏洪文 | Switch selecting and moment measuring method for single phase earthing fault of small current earthed system |
| CN100348990C (en) * | 2005-05-09 | 2007-11-14 | 昆明理工大学 | Adaptive approach for route selection of grounded system connected to arc suppression coil |
| JP2008215832A (en) * | 2007-02-28 | 2008-09-18 | Komatsu Ltd | Harness failure position detection device |
| CN101539607B (en) * | 2009-04-09 | 2011-10-26 | 北京市天利自动化设备研究所 | Method for grounding and selecting lines of low-current grounding system and device |
-
2009
- 2009-11-09 CN CN2009101854249A patent/CN101706547B/en not_active Expired - Fee Related
Cited By (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101943737A (en) * | 2010-08-04 | 2011-01-12 | 清华大学 | Single-phase earth fault diagnosis method and device |
| 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 |
| CN101915884A (en) * | 2010-08-13 | 2010-12-15 | 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 |
| CN102221660A (en) * | 2011-03-18 | 2011-10-19 | 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 |
| CN102590700A (en) * | 2011-12-23 | 2012-07-18 | 山东电力集团公司淄博供电公司 | Method and device for quickly locating faults of overhead line on basis of time synchronization |
| WO2014101657A1 (en) * | 2012-12-31 | 2014-07-03 | 中国矿业大学 | Method for eliminating dead area of single-terminal traveling wave fault location of high-voltage power grid in coal mine |
| 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 |
| CN103293449A (en) * | 2012-12-31 | 2013-09-11 | 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 |
| CN103176103A (en) * | 2013-03-15 | 2013-06-26 | 华北电力大学 | Overhead power distribution line single-phase grounding fault positioning method |
| CN103217625A (en) * | 2013-03-20 | 2013-07-24 | 山东理工大学 | Low current earth fault location method based on transient state current waveform comparison |
| CN103809082A (en) * | 2014-02-17 | 2014-05-21 | 四川大学 | Distance measurement method for power distribution network single-phase earth fault on the basis of aerial mode traveling wave mutation |
| 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 |
| CN104330708A (en) * | 2014-11-25 | 2015-02-04 | 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 |
| CN106019088A (en) * | 2016-05-17 | 2016-10-12 | 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 | DC earth electrode line fault location 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 |
| CN108693446A (en) * | 2018-05-25 | 2018-10-23 | 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 |
| CN109541401A (en) * | 2018-12-29 | 2019-03-29 | 上海仁童电子科技有限公司 | Cable detection method, device and electronic equipment |
| 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 |
| CN113533907A (en) * | 2021-08-30 | 2021-10-22 | 国网江苏省电力有限公司宿迁供电分公司 | Fault positioning method for small-resistance grounding power distribution network based on zero-sequence voltage distribution characteristics |
| 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 |
| CN114062970A (en) * | 2021-12-09 | 2022-02-18 | 安徽三联学院 | Low-current ground fault line selection method and device based on secondary power transformation system |
| CN114062970B (en) * | 2021-12-09 | 2024-03-15 | 安徽三联学院 | Low-current ground fault line selection method and device based on secondary power transformation system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101706547B (en) | 2012-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101706547B (en) | Method for locating single-phase grounding fault by adopting transient state travelling wave and injection method | |
| CN102253315B (en) | Based on the Fault Locating Method of single end distance measurement | |
| CN109444644B (en) | Transient component differential-based power distribution network single-phase earth fault line selection method | |
| CN1180272C (en) | Small-current earth fault switch-selecting and sectioning method for power system | |
| CN101943737B (en) | Single-phase earth fault diagnosis method and device | |
| CN110350483B (en) | Power converter device with ground fault detection function and fault detection method | |
| CN201993433U (en) | Travelling wave distance measurement system for grounding electrode line of high voltage direct current (HVDC) transmission system | |
| CN102231517B (en) | Method and system for determining and isolating power distribution network fault | |
| CN101201380A (en) | Method for faulty orientation and subsection of power system low current grounding | |
| CN102621451B (en) | Based on the distribution circuit single-phase earth fault detection method of momentary signal method | |
| CN108303614B (en) | 10kV cable network low-current grounding system fault positioning system and method | |
| CN102590654B (en) | Element and method for discriminating fault electrode of DC transmission line | |
| CN103245879A (en) | Small current neutral grounding fault location method based on direction of transient state reactive power | |
| CN109387743A (en) | Switch and thus generate the method for single end distance measurement of traveling wave Injection Signal using neutral point | |
| CN105974254B (en) | The temporary stable state selection method of comprehensive weight is calculated based on voltage | |
| CN109617026B (en) | Ultrahigh-speed protection method for earth fault of direct-current power grid converter station | |
| CN102135591A (en) | Resonant grounding power grid single-phase ground fault db wavelet transient component line selection method | |
| CN104391221A (en) | Fault phase selection method utilizing phase current gradient sums | |
| CN103323674A (en) | Circuit and method for real-time detection of ground insulation impedance of photovoltaic grid-connected inverter | |
| CN101661074A (en) | Judging method for transient and permanent faults of transmission line with parallel reactance | |
| CN101692103B (en) | Testing method of parameters and characteristics of lightning strike of electric transmission line | |
| CN109256756A (en) | The MMC-HVDC to power to passive network exchanges adaptive reclosing method | |
| CN103048567A (en) | Method for judging parallel reactor-containing transmission line malfunction properties based on wave form estimation | |
| CN102005741A (en) | Distribution network line single phase earthing fault diagnosis and isolation method and device | |
| CN104977499A (en) | Small current grounding system single-phase grounding fault line selection method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120104 Termination date: 20141109 |
|
| EXPY | Termination of patent right or utility model |