CN109387748A - A kind of power distribution network distribution small current grounding fault localization method and device - Google Patents
A kind of power distribution network distribution small current grounding fault localization method and device Download PDFInfo
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- CN109387748A CN109387748A CN201811573446.8A CN201811573446A CN109387748A CN 109387748 A CN109387748 A CN 109387748A CN 201811573446 A CN201811573446 A CN 201811573446A CN 109387748 A CN109387748 A CN 109387748A
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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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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
- G01R31/088—Aspects of digital computing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Locating Faults (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a kind of power distribution network distribution small current grounding fault localization method and devices, when including: that ground fault occurs, faulty line where faulty line monitors terminal, acquire failure zero-sequence current information, the fault message between adjacent end is exchanged by ad hoc communications network, similarity factor is calculated using waveform Similarity algorithm, similarity factor calculated result is sent to station institute's terminal by the faulty line monitoring terminal where faulty line later, institute's terminal of standing judges the size relation of similarity factor Yu preset correlation coefficient number threshold according to similarity factor and faulty line topological structure, finally obtain fault section.The present invention makes full use of substation information advantage abundant, is effectively reduced under single Collaborative Control type distributed fault station-keeping mode, causes to upload multiple positioning results because of failure path monitoring terminal error starting；The advantages such as distributed fault locating speed is fast, communication pressure is small are also utilized simultaneously, reduce the pressure of main website and communication, improve fault location accuracy.
Description
Technical field
The present invention relates to Distribution Automation Technology field, in particular to a kind of power distribution network distribution small current grounding fault is fixed
Position method and device.
Background technique
China 10kV and following low and medium voltage distribution network neutral point are widely used earth-free or transport through grounding through arc mode
Row.When single-phase (low current) ground fault occurs, fault-signal is faint, is not easy to detect, and singlephase earth fault occurrence frequency
Height, the reasons such as power distribution network branch is numerous in addition, power load distributing is random, the small current grounding fault positioning made become distribution network failure
One big technical problem of processing.Therefore, section occurs for determination small current grounding fault promptly and accurately, improves troubleshooting speed
Degree reduces fault incidence, is of great significance to raising electrical stability, reliability.
The fault location mode of existing centralization is uploaded the unification of line current recorder data using path monitoring terminal
To power distribution automation main station, fault location is realized by main website, the advantage of the mode but need to be uploaded a large amount of using integrated information
Recorder data, it is big to main website and the pressure of communication；In addition, under single Collaborative Control type distributed fault station-keeping mode, by
Path monitoring terminal error starting influences, and causes to upload multiple fault location as a result, fault location is inaccurate.
Summary of the invention
This application provides a kind of power distribution network distribution small current grounding fault localization method and devices, to solve existing skill
Power distribution network distribution small current grounding fault localization method in art need to upload a large amount of recorder data, to the pressure of main website and communication
Power is big, and is influenced by path monitoring terminal error starting, causes to upload multiple fault location as a result, fault location inaccuracy is asked
Topic.
In order to solve the above-mentioned technical problem first aspect present invention provides a kind of power distribution network distribution small current grounding fault
Localization method, the method is for institute's terminal of standing, which comprises
Terminal is monitored to faulty line and sends fault message request, and the fault message request includes the two neighboring event
Hinder the similarity factor of path monitoring terminal room；
Obtain the similarity factor of the two neighboring faulty line monitoring terminal room；
The similarity factor is combined with faulty line topological structure, judges the similarity factor and preset correlation coefficient number
The size relation of threshold, if the similarity factor is less than the preset correlation coefficient number threshold, the two neighboring fault wire
It is fault section between terminal that road, which monitors, is otherwise non-faulting section between the two neighboring faulty line monitoring terminal.
Preferably, described to send fault message request to faulty line monitoring terminal, the fault message request includes phase
Before the similarity factor of adjacent two faulty line monitoring terminal rooms further include:
Acquire the residual voltage of station institute's terminal sampled point；
Judge the size relation of the residual voltage Yu voltage starting threshold value；
If having n-1 and institute's terminal sampling in station described above in a continuous station institute terminal sampled point of n (n > 3)
The amplitude of point is greater than the voltage starting threshold value, carries out failure line selection.
Preferably, the calculation formula of the voltage starting threshold value are as follows: Uset=KrelU0。
Corresponding to the embodiment of the present application in a first aspect, according to the second aspect of the embodiment of the present application, a kind of distribution is provided
Distributed small current grounding fault localization method is netted, the method monitors terminal for faulty line, which comprises
Acquire the zero-sequence current of the faulty line monitoring terminal sampled point；
The similarity factor of the two neighboring faulty line monitoring terminal room is calculated according to the zero-sequence current.
Preferably, the calculation formula of the similarity factor are as follows:
Preferably, the similar system that the two neighboring faulty line monitoring terminal room is calculated according to the zero-sequence current
Before number further include:
Judge the size relation of the zero-sequence current Yu current start threshold value；
If having n-1 and institute's terminal sampling in station described above in a continuous station institute terminal sampled point of n (n > 3)
The amplitude of point is greater than the current start threshold value, calculates the similarity factor.
Preferably, the calculation formula of the current start threshold value are as follows: Iset=KrelI0n。
Corresponding to the embodiment of the present application in a first aspect, according to the third aspect of the embodiment of the present application, a kind of distribution is provided
Distributed small current grounding fault positioning device is netted, described device includes: for institute's terminal of standing, described device
Request sending module, for sending fault message request, the fault message request to faulty line monitoring terminal
Similarity factor including the two neighboring faulty line monitoring terminal room；
Data obtaining module, for obtaining the similarity factor of the two neighboring faulty line monitoring terminal room；
First judgment module judges described similar for combining the similarity factor with faulty line topological structure
The size relation of coefficient and preset correlation coefficient number threshold, if the similarity factor is less than the preset correlation coefficient number threshold,
Be fault section between two neighboring faulty line monitoring terminal, otherwise the two neighboring faulty line monitoring terminal it
Between be non-faulting section.
Preferably, described device further include:
First acquisition module, for acquiring the residual voltage of station institute's terminal sampled point；
Second judgment module, for judging the size relation of the residual voltage Yu voltage starting threshold value；
Execution module, if for having n-1 and the above institute in a continuous station institute terminal sampled point of n (n > 3)
The amplitude for stating station institute's terminal sampled point is greater than the voltage starting threshold value, carries out failure line selection.
A kind of distribution is provided according to the fourth aspect of the embodiment of the present application corresponding to the third aspect of the embodiment of the present application
Distributed small current grounding fault positioning device is netted, described device monitors terminal for faulty line, and described device includes:
Second acquisition module, for acquiring the zero-sequence current of the faulty line monitoring terminal sampled point；
Computing module, for calculating the similar of the two neighboring faulty line monitoring terminal room according to the zero-sequence current
Coefficient.
The technical scheme provided by this disclosed embodiment can include the following benefits: to faulty line monitoring terminal hair
Fault message is sent to request, the fault message request includes the similarity factor of the two neighboring faulty line monitoring terminal room.
When ground fault occurs, the faulty line where faulty line monitors terminal, acquires failure zero-sequence current information, logical by equity
Communication network exchanges the fault message between adjacent end, calculates similarity factor using waveform Similarity algorithm.Later where faulty line
Faulty line monitoring terminal similarity factor calculated result is sent to station institute's terminal, institute's terminal of stand according to the similarity factor and
Faulty line topological structure judges the size relation of the similarity factor Yu preset correlation coefficient number threshold, finally obtains faulty section
Section.The present invention makes full use of substation information advantage abundant, and single Collaborative Control type distributed fault positioning is effectively reduced
Under mode, cause to upload multiple positioning results because of failure path monitoring terminal error starting；Distributed fault is also utilized simultaneously
The advantages such as locating speed is fast, communication pressure is small reduce the pressure of main website and communication, improve fault location accuracy.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is that the process of power distribution network distribution small current grounding fault localization method provided in an embodiment of the present invention is illustrated
Figure；
Fig. 2 is distribution FA system diagram provided in an embodiment of the present invention；
Fig. 3 is fault treating procedure schematic diagram provided in an embodiment of the present invention；
Fig. 4 is station institute terminal fault position fixing process schematic diagram provided in an embodiment of the present invention；
Fig. 5 is that the process of power distribution network distribution small current grounding fault localization method provided in an embodiment of the present invention is illustrated
Figure；
Fig. 6 is a kind of present invention block diagram of positioning device shown according to an exemplary embodiment；
Fig. 7 is a kind of present invention block diagram of positioning device shown according to an exemplary embodiment.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Whole description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is that the process of power distribution network distribution small current grounding fault localization method provided in an embodiment of the present invention is illustrated
Figure.The method can be used for standing institute's terminal, and institute's terminal of standing in the present embodiment is main control terminal, and faulty line monitoring terminal is
Faulty line side path monitoring terminal.
Step S101 sends fault message request to faulty line monitoring terminal, and the fault message request includes adjacent
The similarity factor of two faulty line monitoring terminal rooms.
As an example, described send fault message request to faulty line monitoring terminal, the fault message request includes
Before the similarity factor of the two neighboring faulty line monitoring terminal room further include:
Acquire the residual voltage of station institute's terminal sampled point；
Judge the size relation of the residual voltage Yu voltage starting threshold value；
If having n-1 and institute's terminal sampling in station described above in a continuous station institute terminal sampled point of n (n > 3)
The amplitude of point is greater than the voltage starting threshold value, carries out failure line selection.
When ground fault occurs, institute's terminal of standing is mutated energy quick start according to residual voltage, realizes failure line selection, then
Fault message request command is sent to faulty line monitoring terminal, waits faulty line monitoring terminal response.Wherein, the voltage
Start the calculation formula of threshold value are as follows: Uset=KrelU0, KrelFor safety factor；U0For the residual voltage virtual value for flowing through the terminal.
Step S102 obtains the similarity factor of the two neighboring faulty line monitoring terminal room.
Step S103 combines the similarity factor with faulty line topological structure, judges the similarity factor and pre-
It is two neighboring if the similarity factor is less than the preset correlation coefficient number threshold if the size relation of related coefficient threshold
It is fault section between the faulty line monitoring terminal, is otherwise non-event between the two neighboring faulty line monitoring terminal
Hinder section.
Fig. 2 is distribution FA system diagram provided in an embodiment of the present invention, specifically, setting substation 1 leads to multiple prisons
Measuring point, each monitoring point is provided with circuit breaker Q F or disconnecting switch QS, and is each equipped with remote measurement and control terminal RTU, each
A RTU is connected with low-current ground fault line selection device, and low-current ground fault line selection device controls main website phase with FA again
Connection, forms a distribution FA system structure.The data of remote measurement and control terminal RTU real-time monitoring monitoring point, by data feedback
Main website is controlled to FA, FA controls main website according to the Fault Locating Method of the application, orients fault point F, and control breaker
QF or disconnecting switch QS work, realizes the defencive function of circuit.Specifically, acquisition failure zero-sequence current information, logical by equity
Communication network exchanges the fault message between the two neighboring faulty line monitoring terminal, is calculated using waveform Similarity algorithm similar
Coefficient, then calculated result is uploaded to line outlet monitoring terminal by each faulty line monitoring terminal, and line outlet monitors terminal
After faulty line this route of validation of information provided according to low-current ground fault line selection device is faulty line, summarize each line
The similarity factor calculated result packing that road monitor terminal uploads is uploaded to station institute's terminal；Institute's terminal of standing is by faulty line topological structure
It is combined with each terminal room similarity factor of upload, realizes fault location and final positioning result is uploaded to main website；It is non-
After the circuit monitoring terminal that faulty line starts because zero-sequence current fluctuates is uploaded to the line outlet monitoring terminal of the route, because
Line outlet monitoring terminal does not receive the fault message request command of station institute's terminal, cancels and uploading.
Fig. 5 is that the process of power distribution network distribution small current grounding fault localization method provided in an embodiment of the present invention is illustrated
Figure.This method can be used for faulty line monitoring terminal.
Step S401 acquires the zero-sequence current of the faulty line monitoring terminal sampled point.
Step S402 calculates the similar system of the two neighboring faulty line monitoring terminal room according to the zero-sequence current
Number.
As an example, the calculation formula of the similarity factor are as follows:Related coefficient door
Sill are ρT, 0 < ρT< 1, (faulty line respectively monitors terminal room to the fault message that institute's terminal of standing uploads line outlet monitoring terminal
Similarity factor calculated result) it is combined with faulty line topological structure, to route downstream since line outlet monitors terminal, according to
Secondary relatively ρmnWith preset correlation coefficient number threshold ρT(0<ρT< 1) relationship, if ρmn<ρTWhen, im0(t) and in0(t) dissimilar, then sentence
Disconnected failure betides between m monitoring terminal and n monitoring terminal；Otherwise, im0(t) and in0(t) similar, between two monitoring points
Section is non-faulting section.Fig. 3 is fault treating procedure schematic diagram provided in an embodiment of the present invention, specifically, ρ1.2Indicate 1 prison
Survey the similarity factor between terminal and 2 monitoring terminals, ρ2.3Indicate the coefficient between 2 monitoring terminals and 3 monitoring terminals, successively class
It pushes away.Fig. 4 is station institute terminal fault position fixing process schematic diagram provided in an embodiment of the present invention.With power supply node to endpoint node be than
Compared with direction, successively the similarity factor between each monitoring terminal is compared with preset correlation coefficient number threshold, for example, working as ρ3.4
Value be less than preset correlation coefficient number threshold ρT, then may determine that failure betides between 3 monitoring terminals and 4 monitoring terminals.
As an example, described calculate the similar of the two neighboring faulty line monitoring terminal room according to the zero-sequence current
Before coefficient further include:
Judge the size relation of the zero-sequence current Yu current start threshold value；
If having n-1 and institute's terminal sampling in station described above in a continuous station institute terminal sampled point of n (n > 3)
The amplitude of point is greater than the current start threshold value, calculates the similarity factor.Wherein, the calculation formula of the current start threshold value
Are as follows: Iset=KrelI0n。KrelFor safety factor；I0nFor the zero-sequence current virtual value for flowing through the terminal.
Following is embodiment of the present disclosure, can be used for executing embodiments of the present disclosure.It is real for disclosure device
Undisclosed details in example is applied, embodiments of the present disclosure is please referred to.
Fig. 6 is a kind of block diagram of positioning device shown according to an exemplary embodiment.The device can be used for standing eventually
End.It is main control terminal in station institute's terminal in the present embodiment, it is faulty line side path monitoring terminal that faulty line, which monitors terminal,.
Request sending module U1001, for sending fault message request, the fault message to faulty line monitoring terminal
Request includes the similarity factor of the two neighboring faulty line monitoring terminal room；
Data obtaining module U1002, for obtaining the similarity factor of the two neighboring faulty line monitoring terminal room.
First judgment module U1003, for combining the similarity factor with faulty line topological structure, described in judgement
The size relation of similarity factor and preset correlation coefficient number threshold, if the similarity factor is less than the preset correlation coefficient number
Sill are then fault section between the two neighboring faulty line monitoring terminal, the otherwise two neighboring faulty line monitoring
It is non-faulting section between terminal.
Described device can also include: the first acquisition module, for acquiring the residual voltage of station institute's terminal sampled point；
Second judgment module, for judging the size relation of the residual voltage Yu voltage starting threshold value；
Execution module, if for having n-1 and the above institute in a continuous station institute terminal sampled point of n (n > 3)
The amplitude for stating station institute's terminal sampled point is greater than the voltage starting threshold value, carries out failure line selection.
Fig. 7 is a kind of block diagram of positioning device shown according to an exemplary embodiment.The device can be used for fault wire
Road monitors terminal, and described device includes:
Second acquisition module U2001, for acquiring the zero-sequence current of the faulty line monitoring terminal sampled point；
Computing module U2002 monitors terminal room for calculating the two neighboring faulty line according to the zero-sequence current
Similarity factor.
As exemplary embodiment, the device for faulty line monitoring terminal may also include that
Third judgment module, for judging the size relation of the zero-sequence current Yu current start threshold value.
Second execution module, if for have in a continuous station institute terminal sampled point of n (n > 3) n-1 it is a and with
The amplitude of upper station institute's terminal sampled point is greater than the current start threshold value, calculates the similarity factor.
From the above technical scheme, when ground fault occurs, institute's terminal of standing is mutated energy according to residual voltage and quickly opens
It is dynamic, it realizes failure line selection, then exports monitoring terminal to faulty line and send fault message request command, faulty line is waited to ring
It answers；Meanwhile the path monitoring terminal detection zero-sequence current Sudden Changing Rate starting where faulty line, acquisition failure zero-sequence current letter
Breath, exchanges the fault message between adjacent end by ad hoc communications network, calculates similarity factor using waveform Similarity algorithm, then
Calculated result is uploaded to line outlet monitoring terminal by each path monitoring terminal, and line outlet monitors terminal according to small current neutral grounding
Faulty line this route of validation of information that fault line selection device provides uploads after faulty line, to summarize each circuit monitoring terminal
Similarity factor calculated result packing be uploaded to station institute's terminal；Institute's terminal of standing is by each terminal of faulty line topological structure and upload
Between similarity factor be combined, realize fault location simultaneously final positioning result is uploaded to main website；Non-fault line is because of zero sequence
After current fluctuation and the circuit monitoring terminal started are uploaded to the line outlet monitoring terminal of the route, because line outlet monitors eventually
End does not receive the fault message request command of station institute's terminal, cancels and uploading.The present invention makes full use of substation information abundant excellent
Gesture is effectively reduced under single Collaborative Control type distributed fault station-keeping mode, leads because of failure path monitoring terminal error starting
It causes to upload multiple positioning results；The advantages such as distributed fault locating speed is fast, communication pressure is small are also utilized simultaneously, reduce main website
With the pressure of communication, fault location accuracy is improved.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to of the invention its
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
Person's adaptive change follows general principle of the invention and including the undocumented common knowledge in the art of the present invention
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be understood that the present invention is not limited to the precise structure already described above and shown in the accompanying drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is limited only by the attached claims.
Claims (10)
1. a kind of power distribution network distribution small current grounding fault localization method, which is characterized in that the method is used for institute's terminal of standing,
The described method includes:
Fault message request is sent to faulty line monitoring terminal, the fault message request includes the two neighboring fault wire
The similarity factor of road monitoring terminal room；
Obtain the similarity factor of the two neighboring faulty line monitoring terminal room；
The similarity factor is combined with faulty line topological structure, judges the similarity factor and preset correlation coefficient number threshold
Size relation, if the similarity factor is less than the preset correlation coefficient number threshold, two neighboring faulty line prison
Surveying is fault section between terminal, is otherwise non-faulting section between the two neighboring faulty line monitoring terminal.
2. power distribution network distribution small current grounding fault localization method as described in claim 1, which is characterized in that described to event
Hinder path monitoring terminal and send fault message request, the fault message is requested including the two neighboring faulty line monitoring eventually
Before similarity factor between end further include:
Acquire the residual voltage of station institute's terminal sampled point；
Judge the size relation of the residual voltage Yu voltage starting threshold value；
If having n-1 and station institute's terminal sampled point described above in a continuous station institute's terminal sampled point of n (n > 3)
Amplitude is greater than the voltage starting threshold value, carries out failure line selection.
3. power distribution network distribution small current grounding fault localization method as described in claim 1, which is characterized in that the voltage
Start the calculation formula of threshold value are as follows: Uset=KrelU0。
4. a kind of power distribution network distribution small current grounding fault localization method, which is characterized in that the method is used for faulty line
Monitor terminal, which comprises
Acquire the zero-sequence current of the faulty line monitoring terminal sampled point；
The similarity factor of the two neighboring faulty line monitoring terminal room is calculated according to the zero-sequence current.
5. power distribution network distribution small current grounding fault localization method as claimed in claim 4, which is characterized in that described similar
The calculation formula of coefficient are as follows:
6. power distribution network distribution small current grounding fault localization method as claimed in claim 4, which is characterized in that the basis
The zero-sequence current calculates before the similarity factor of the two neighboring faulty line monitoring terminal room further include:
Judge the size relation of the zero-sequence current Yu current start threshold value；
If having n-1 and station institute's terminal sampled point described above in a continuous station institute's terminal sampled point of n (n > 3)
Amplitude is greater than the current start threshold value, calculates the similarity factor.
7. power distribution network distribution small current grounding fault localization method as claimed in claim 6, which is characterized in that the electric current
Start the calculation formula of threshold value are as follows: Iset=KrelI0n。
8. a kind of power distribution network distribution small current grounding fault positioning device, which is characterized in that described device is used for institute's terminal of standing,
Described device includes:
Request sending module, for sending fault message request to faulty line monitoring terminal, the fault message request includes
The similarity factor of the two neighboring faulty line monitoring terminal room；
Data obtaining module, for obtaining the similarity factor of the two neighboring faulty line monitoring terminal room；
First judgment module judges the similarity factor for combining the similarity factor with faulty line topological structure
It is adjacent if the similarity factor is less than the preset correlation coefficient number threshold with the size relation of preset correlation coefficient number threshold
It is fault section between two faulty line monitoring terminals, is otherwise between the two neighboring faulty line monitoring terminal
Non-faulting section.
9. power distribution network distribution small current grounding fault positioning device as claimed in claim 8, which is characterized in that described device
Further include:
First acquisition module, for acquiring the residual voltage of station institute's terminal sampled point；
Second judgment module, for judging the size relation of the residual voltage Yu voltage starting threshold value；
Execution module, if for having n-1 and station described above in a continuous station institute terminal sampled point of n (n > 3)
The amplitude of institute's terminal sampled point is greater than the voltage starting threshold value, carries out failure line selection.
10. a kind of power distribution network distribution small current grounding fault positioning device, it is characterised in that, described device is used for fault wire
Road monitors terminal, and described device includes:
Second acquisition module, for acquiring the zero-sequence current of the faulty line monitoring terminal sampled point；
Computing module, for calculating the similar system of the two neighboring faulty line monitoring terminal room according to the zero-sequence current
Number.
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Cited By (5)
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| CN110873833A (en) * | 2019-12-10 | 2020-03-10 | 国网河南省电力公司洛阳供电公司 | Self-adaptive fault section positioning method for power distribution network containing distributed power supply |
| CN110873832A (en) * | 2019-11-17 | 2020-03-10 | 云南电网有限责任公司临沧供电局 | Power distribution network line selection method and system based on wavelet energy entropy |
| CN111999605A (en) * | 2020-09-16 | 2020-11-27 | 珠海许继芝电网自动化有限公司 | Power distribution network fault tolerance judgment method and device based on fault correlation analysis |
| CN112114229A (en) * | 2020-09-15 | 2020-12-22 | 广东电网有限责任公司 | Power distribution network fault positioning method, device and system |
| CN112531767A (en) * | 2020-10-19 | 2021-03-19 | 国网辽宁省电力有限公司 | Neutral point grounding mode and single-phase grounding fault positioning method for medium-voltage island microgrid |
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