CN108535601A - A kind of line-to-ground fault judgment method - Google Patents
A kind of line-to-ground fault judgment method Download PDFInfo
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- CN108535601A CN108535601A CN201810401518.4A CN201810401518A CN108535601A CN 108535601 A CN108535601 A CN 108535601A CN 201810401518 A CN201810401518 A CN 201810401518A CN 108535601 A CN108535601 A CN 108535601A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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Abstract
The invention discloses a kind of line-to-ground fault judgment methods, it, which includes the outer signal generation apparatus and the unit and at least one that collects of transient state recording type fault detector applied being installed on distribution network line being connect with master station communication, has the collecting unit of recording function；By applying whether signal generation apparatus and collecting unit failure judgement occur outside, again signature waveform is sent out by applying signal generation apparatus outside, collecting unit carries out recording to circuit and wave-record chart is uploaded main website, main website analyzes whether corresponding line node occurs earth fault according to the wave-record chart, the method of the present invention combines existing the advantages of there are two types of fault detectors, learn from other's strong points to offset one's weaknesses and overcome the applied defect of other side, significantly improves earth fault judging nicety rate.
Description
Technical field
The present invention relates to belong to 6~35KV distribution network line faults to judge field more particularly to a kind of line-to-ground fault
Judgment method.
Background technology
That there is electricity grid network topological structures is intricate for the power distribution network of 6~35KV of China, wide, the intelligent water that sets up range
The features such as flat low.Fault detector equipment can help power grid operation maintenance personnel to be quickly found out faulty line, determine positioning failure area
Between, therefore fault detector equipment is widely applied on distribution line.Traditional fault detector can normally judge alternate
Short trouble, but it is then relatively low to the judging nicety rate of earth fault.It may determine that the fault detector master of earth fault at present
Signal fault indicator and transient state recording type fault detector are applied outside having.
The outer testing principle for applying signal type fault detector：When it is outer apply signal generation apparatus and detect earth fault after, production
Raw current mode characteristic signal sends association message to indicating fault after the collecting unit of fault detector detects characteristic signal
Device collects unit, collects unit and forwards the packet to main website, main website is according to the unit that collects of interdependent node fault detector
It is no to report message information to determine fault section.
The testing principle of transient state recording type fault detector：Moment occurs for earth fault, can change to earth electric field, this
When transient state recording type fault detector startup separator recording, and Wave data is transmitted to main website, main website is calculated according to breakdown judge
Method comes failure judgement section.
But signal type fault detector and the equal existing defects of transient state recording type fault detector are applied outside.
Apply defect existing for signal type fault detector outside：
1. high resistance ground occurs, signal generation apparatus is applied outside and does not send out characteristic signal；
2. it is too small that the collecting unit of fault detector is possible to collected characteristic signal, can not judge to be out of order；
3. being only applicable to stable state ground connection, it is not suitable for the unstable state earth fault such as arc grounding.
Defect existing for transient state recording type fault detector：
1. it is affected by environment excessive, it is easy wrong report under the weather conditions such as thunderstorm, dense fog, fails to report, basic reason is electricity
Spatial distribution capacitance between line and the earth is affected by humidity etc.；
2. voltage of electric field signal is influenced by internal derided capacitors precision, there are phase shifts.
Invention content
The present invention provides a kind of judgment methods of line-to-ground fault, and which overcome the existing events described in background technology
Hinder the relatively low disadvantage of the earth fault judgment accuracy of indicator.
The technical solution adopted by the present invention to solve the technical problems is：
A kind of line-to-ground fault judgment method, it includes that being installed in of being connect with master station communication is outer on distribution network line
The unit and at least one that collects for applying signal generation apparatus and transient state recording type fault detector has the collecting unit of recording function；
The earth fault judgment method includes the following steps：
Step 1, if outer apply signal generation apparatus or collecting unit judges that earth fault event occurs, 2 are thened follow the steps,
If applying signal generation apparatus or collecting unit outside does not judge that earth fault event occurs, but ground connection event occurs for user feedback
Barrier, thens follow the steps 3；
Step 2, main website according to applying signal generation apparatus or collecting unit to calling time in earth fault event, automatically outside
The outer signal generation apparatus of applying of notice sends out signature waveform after the upper first time interval to call time, while automatic notice collects list
Member requires collecting unit to start recording after the first time interval, using execution step 4 after the second time interval；
Step 3, after receiving user feedback earth fault, signal generation apparatus is applied first outside manual manipulation main website notice
Signature waveform is sent out after time interval, while automatic notice collects unit and collecting unit is required to start record after the first time interval
Wave, using execution step 4 after the second time interval；
Step 4, the recorder data at moment needed for main website calling, carries out feature extraction, if the recording number to the recorder data
According to the characteristic signal containing this feature waveform, then judge that earth fault has occurred, otherwise that earth fault does not occur.
Among one embodiment：This is outer apply signature waveform that signal generation apparatus is sent out can be by GPS or Big Dipper clock synchronization.
Among one embodiment：This collects unit by GPS or Big Dipper clock synchronization, and the clock synchronization time is issued to acquisition list
Member collects the recorder data that unit can receive collecting unit upload, and can be according to main website order request collecting unit in main website
Pass recorder data.
Among one embodiment：The recorder data is the current signal and voltage signal of acquisition, which can be according to remittance
The order that collection unit issues starts recording and send recorder data in main website.
Among one embodiment：The mode that the recorder data takes cycle to store in collecting unit is stored, storage
Time span is not less than 10 minutes.
Among one embodiment：This feature waveform is pulse train.
Compared with the background art, it has the following advantages that the technical program：
1, the present invention install simultaneously on the line the outer collecting unit for applying signal generator and recording type fault detector and
Collect unit, by applying whether signal generation apparatus and collecting unit failure judgement occur outside, then by applying signal generation apparatus outside
Signature waveform is sent out, collecting unit carries out recording to circuit and wave-record chart is uploaded main website, and main website is according to the wave-record chart point
It is precipitated whether corresponding line node occurs earth fault, the method for the present invention combines existing the advantages of there are two types of fault detectors,
Learn from other's strong points to offset one's weaknesses and overcome the applied defect of other side, significantly improves earth fault judging nicety rate.
2, apply signal generation apparatus and the fault detector with recording function outside has had certain scale in power industry
Application, have already passed through market validation, therefore the method for the present invention can utilize existing hardware platform breakdown judge according to the invention
Logical update relative program can be realized, and the optimization of scheme is at low cost, convenient for promoting.
Description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the outer signature waveform applied signal generation apparatus and sent out described in the present embodiment.
Specific implementation mode
A kind of line-to-ground fault judgment method, it includes that being installed in of being connect with master station communication is outer on distribution network line
The unit and at least one that collects for applying signal generation apparatus and transient state recording type fault detector has the collecting unit of recording function；
The earth fault judgment method includes the following steps：
Step 1, if outer apply signal generation apparatus or collecting unit judges that earth fault event occurs, 2 are thened follow the steps,
If applying signal generation apparatus or collecting unit outside does not judge that earth fault event occurs, but ground connection event occurs for user feedback
Barrier, thens follow the steps 3；
Step 2, main website according to applying signal generation apparatus or collecting unit to calling time in earth fault event, automatically outside
Applying signal generation apparatus outside notice, (in the present embodiment, which takes 5 points in the upper first time interval to call time
Clock) after send out signature waveform (please referring to Fig. 1, this feature waveform is pulse train), while automatic notice collects unit first
Collecting unit is required to start recording after time interval, using execution step 4 after the second time interval；
Step 3, after receiving user feedback earth fault, signal generation apparatus is applied first outside manual manipulation main website notice
Signature waveform is sent out after time interval, while automatic notice collects unit and collecting unit is required to start record after the first time interval
Wave, using execution step 4 after the second time interval；
Step 4, the recorder data at moment needed for main website calling, carries out feature extraction, if the recording number to the recorder data
According to the characteristic signal (if earth fault occurs) containing this feature waveform, then judges that earth fault has occurred, otherwise do not send out
Raw earth fault.This feature signal can be that shape is identical as this feature waveform, but the waveform signal that amplitude is different.
This is outer apply signature waveform that signal generation apparatus is sent out can be by GPS or Big Dipper clock synchronization, it is micro- that clock synchronization error is no more than 1
It is wonderful.
This collects unit by GPS or Big Dipper clock synchronization, and clock synchronization error is delicate no more than 1, and the clock synchronization time is issued to
Collecting unit, collect unit can receive collecting unit upload recorder data, and can according to main website order request collecting unit to
Main website uploads recorder data.
The recorder data is the current signal and voltage signal of acquisition, and collecting unit energy basis collects the life that unit issues
It enables and starts recording and send recorder data in main website.The mode that the recorder data takes cycle to store in collecting unit is deposited
The time span of storage, storage is not less than 10 minutes.
This case by applying the collecting unit of signal generation apparatus and transient state recording type fault detector simultaneously to circuit outside
Earth fault is monitored, the advantages of combining both fault detectors, is learnt from other's strong points to offset one's weaknesses and is overcome the applied defect of other side, is shown
It writes and improves earth fault judging nicety rate, be embodied in：
For the existing defect for applying signal fault indicator outside：
1. when high resistance ground occurs, earth fault cannot be judged so that not sending out feature letter by applying signal generation apparatus outside
Number, but the collecting unit of this case transient state recording type fault detector can determine whether out earth fault, thus by being applied outside main website order
Signal generation apparatus sends out characteristic signal, and then judges the earth fault of interdependent node；
It is too small that 2. the outer collecting unit for applying signal fault indicator is possible to collected characteristic signal, can not judge therefore
Barrier, but the collecting unit of this case transient state recording type fault detector can collect larger characteristic signal；
3. outer signal fault indicator of applying is only applicable to stable state ground connection, it is not suitable for the unstable state such as arc grounding ground connection event
Barrier, i.e., outer signal generation apparatus of applying can not judge unstable state earth fault, but this case transient state recording type fault detector is adopted
Collection unit can determine whether out earth fault, thus send out characteristic signal by applying signal generation apparatus outside main website order, and then to phase
The earth fault of artis is judged.
For defect existing for transient state recording type fault detector：
1. transient state recording type fault detector is affected by environment excessive, under the weather conditions such as thunderstorm, dense fog be easy wrong report,
It fails to report；But this case can be used outer signal generation apparatus of applying and carry out breakdown judge and the feature by applying signal generation apparatus generation outside
Waveform carries out Fault Node Diagnosis, therefore can avoid influence of the weather condition to diagnostic result.
2. voltage of electric field signal is influenced by internal derided capacitors precision, carried out using outer signal generation apparatus of applying by this case
Breakdown judge and the signature waveform by applying signal generation apparatus generation outside carry out Fault Node Diagnosis, can avoid it and are tied to diagnosis
The influence of fruit.
The above, only present pre-ferred embodiments, therefore cannot limit the scope of implementation of the present invention according to this, i.e., according to
Equivalent changes and modifications made by the scope of the claims of the present invention and description all should still belong in the range of the present invention covers.
Claims (6)
1. a kind of line-to-ground fault judgment method, it is characterised in that：Include connect with master station communication be installed in distribution cable
The outer signal generation apparatus and the unit and at least one that collects of transient state recording type fault detector applied of road has recording function
Collecting unit；
The earth fault judgment method includes the following steps：
Step 1, if outer apply signal generation apparatus or collecting unit judges that earth fault event occurs, 2 are thened follow the steps, if outside
It applies signal generation apparatus or collecting unit and does not judge that earth fault event occurs, but earth fault occurs for user feedback, then
Execute step 3；
Step 2, main website notifies automatically according to signal generation apparatus or collecting unit is applied outside to calling time in earth fault event
Outer signal generation apparatus of applying sends out signature waveform after the upper first time interval to call time, while automatic notice collects unit and exists
Collecting unit is required to start recording after first time interval, using execution step 4 after the second time interval；
Step 3, after receiving user feedback earth fault, signal generation apparatus is applied outside manual manipulation main website notice at the first time
Signature waveform is sent out behind interval, while automatic notice collects unit and collecting unit is required to start recording after the first time interval,
Using execution step 4 after the second time interval；
Step 4, the recorder data at moment needed for main website calling, carries out feature extraction, if the recorder data contains to the recorder data
There is the characteristic signal of this feature waveform, then judges that earth fault has occurred, otherwise that earth fault does not occur.
2. a kind of line-to-ground fault judgment method according to claim 1, it is characterised in that：The outer signal of applying fills
Setting the signature waveform sent out can be by GPS or Big Dipper clock synchronization.
3. a kind of line-to-ground fault judgment method according to claim 1, it is characterised in that：This collects unit and passes through
GPS or Big Dipper clock synchronization, and the clock synchronization time is issued to collecting unit, collect the recording number that unit can receive collecting unit upload
According to, and according to main website order request collecting unit recorder data can be uploaded to main website.
4. a kind of line-to-ground fault judgment method according to claim 1, it is characterised in that：The recorder data is acquisition
Current signal and voltage signal, which can start recording according to the order that unit issues is collected and send record in main website
Wave number evidence.
5. a kind of line-to-ground fault judgment method according to claim 4, it is characterised in that：The recorder data is acquiring
The mode that cycle stores is taken to be stored in unit, the time span of storage is not less than 10 minutes.
6. a kind of line-to-ground fault judgment method according to claim 1, it is characterised in that：This feature waveform is pulse
Sequence.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810401518.4A CN108535601A (en) | 2018-04-28 | 2018-04-28 | A kind of line-to-ground fault judgment method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810401518.4A CN108535601A (en) | 2018-04-28 | 2018-04-28 | A kind of line-to-ground fault judgment method |
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| CN201810401518.4A Pending CN108535601A (en) | 2018-04-28 | 2018-04-28 | A kind of line-to-ground fault judgment method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174591A (en) * | 2019-05-24 | 2019-08-27 | 山东电工豪迈节能科技有限公司 | A kind of circuit test system and test fixture based on transient state recording type fault detector |
| CN110441652A (en) * | 2019-07-25 | 2019-11-12 | 北京三清互联科技有限公司 | It is a kind of highly sensitive outer to apply signal type fault location system and method |
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| JPH02201274A (en) * | 1989-01-31 | 1990-08-09 | Chubu Electric Power Co Inc | Method of foreseeing ground fault of power cable |
| CN201639363U (en) * | 2010-03-25 | 2010-11-17 | 国电南瑞科技股份有限公司 | Comprehensive three-state data measuring and control device for intelligent transformer station |
| CN101900777A (en) * | 2009-05-27 | 2010-12-01 | 河南省电力勘测设计院 | Monitoring method and device of power system |
| CN106771870A (en) * | 2016-12-26 | 2017-05-31 | 北京国电通网络技术有限公司 | A kind of distribution net work earthing fault localization method and system |
| CN107121622A (en) * | 2017-06-16 | 2017-09-01 | 山东电工电气集团新能科技有限公司 | The method that novel fault is indicated system and earth fault is indicated using the system |
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2018
- 2018-04-28 CN CN201810401518.4A patent/CN108535601A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02201274A (en) * | 1989-01-31 | 1990-08-09 | Chubu Electric Power Co Inc | Method of foreseeing ground fault of power cable |
| CN101900777A (en) * | 2009-05-27 | 2010-12-01 | 河南省电力勘测设计院 | Monitoring method and device of power system |
| CN201639363U (en) * | 2010-03-25 | 2010-11-17 | 国电南瑞科技股份有限公司 | Comprehensive three-state data measuring and control device for intelligent transformer station |
| CN106771870A (en) * | 2016-12-26 | 2017-05-31 | 北京国电通网络技术有限公司 | A kind of distribution net work earthing fault localization method and system |
| CN107121622A (en) * | 2017-06-16 | 2017-09-01 | 山东电工电气集团新能科技有限公司 | The method that novel fault is indicated system and earth fault is indicated using the system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174591A (en) * | 2019-05-24 | 2019-08-27 | 山东电工豪迈节能科技有限公司 | A kind of circuit test system and test fixture based on transient state recording type fault detector |
| CN110441652A (en) * | 2019-07-25 | 2019-11-12 | 北京三清互联科技有限公司 | It is a kind of highly sensitive outer to apply signal type fault location system and method |
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Application publication date: 20180914 |