CN106338676B - A kind of method of distribution small current grounding fault positioning - Google Patents
A kind of method of distribution small current grounding fault positioning Download PDFInfo
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- CN106338676B CN106338676B CN201610740042.8A CN201610740042A CN106338676B CN 106338676 B CN106338676 B CN 106338676B CN 201610740042 A CN201610740042 A CN 201610740042A CN 106338676 B CN106338676 B CN 106338676B
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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
Abstract
A kind of method of distribution small current grounding fault positioning, belongs to power automation technology.It is characterized by comprising following steps: step a, and distribution terminal carries out the record of sampling and waveform to the zero-sequence current in distribution network；Step b, distribution terminal detect zero-sequence current information, while listening to broadcast message that other distribution terminals in distribution network issue and executing zero-sequence current monitoring subprogram and Web broadcast listens to subprogram；Step c, distribution terminal carry out the comparison of zero-sequence current amplitude；Step d, confirmation neighborhood detect distribution terminal；Step e starts neighborhood testing process by neighborhood detection distribution terminal；Step f judges fault section or suspected malfunctions section using neighborhood testing process, and fault location is completed.The method positioned by this distribution small current grounding fault participates in the decision process of fault section without main website, and adaptability is wide and reliability is higher.
Description
Technical field
A kind of method of distribution small current grounding fault positioning, belongs to power automation technology.
Background technique
In China, earth-free or small current neutral grounding mode is widely used in power network neutral point, and most main in distribution network failure
The failure mode wanted is singlephase earth fault, accounts for 80% of total failare or more, seriously affects the normal life of user.Fault location
Technology is always a great problem for perplexing power department there are bigger difficulty.By studying for a long time, small current neutral grounding event
Barrier positioning is improved, but still lacks mature, practical Fault Locating Method, while in existing localization method,
The participation of main website is needed, positioning flow is relatively complicated.Therefore, after power distribution network breaks down, abort situation is quickly found, and in time
Processing, to power failure area is reduced, improving power supply reliability has critically important realistic meaning.
Summary of the invention
The technical problem to be solved by the present invention is overcoming the deficiencies of the prior art and provide a kind of judgement in fault section
It is participated in the process without main website, adaptability is wide and the method for the higher distributed small current grounding fault positioning of reliability.
The technical solution adopted by the present invention to solve the technical problems is: the side of distribution small current grounding fault positioning
Method, characterized by the following steps:
Step a, the distribution terminal in distribution network carry out the note of sampling and waveform to the zero-sequence current in distribution network
Record；
Step b, distribution terminal execute what zero-sequence current monitoring subprogram sampled the zero-sequence current in distribution network
Zero-sequence current information is detected and handled in the process, while listening to subprogram using Web broadcast and listening to and handle power distribution network
The zero-sequence current information that other distribution terminals issue in network；
Step c, distribution terminal the zero-sequence current information of self record is broadcasted with other distribution terminals for receiving zero
Sequence current information carries out the calculating of amplitude using zero-sequence current amplitude calculation formula respectively, and carries out the ratio of zero-sequence current amplitude
Compared with；
Step d confirms the wherein biggish zero sequence of current amplitude after distribution terminal progress zero-sequence current information relatively finishes
Distribution terminal corresponding to current information detects distribution terminal as neighborhood；
Step e starts neighborhood testing process by the neighborhood detection distribution terminal determined in step d；
Step f judges fault section or suspected malfunctions section using neighborhood testing process, and fault location is completed.
Preferably, zero-sequence current described in step b monitors subprogram, includes the following steps:
Step b1-1, distribution terminal detect the zero-sequence current information in distribution network, distribution terminal judgement detection
To zero-sequence current information whether reach distribution terminal itself entry condition, if reaching distribution terminal itself entry condition, hold
Row step b1-2 returns to the step a if not up to distribution terminal itself entry condition；
Step b1-2 broadcasts the zero-sequence current information itself detected to distribution network after distribution terminal starting；
Step b1-3, distribution terminal judged within scheduled interval time, if receive other distribution in distribution network
The zero-sequence current information that terminal issues, if receiving the zero-sequence current information that the broadcast of other distribution terminals issues, described in execution
Step c execute the step f if do not received.
Preferably, the judgment basis of itself entry condition of distribution terminal described in step b1-1 are as follows: distribution terminal will be examined
The zero-sequence current information measured is compared with threshold value set in advance, if at least 2 in 3 continuous sampled points
The amplitude of sampled point is greater than threshold value, then it represents that zero-sequence current information has reached distribution terminal itself entry condition, threshold value Ist
Calculation formula are as follows:
Ist=KrelI0i
Wherein, KrelFor coefficient of reliability, I0iFor the virtual value of i sections of capacitance currents between downstream line and the earth, I0i's
Calculation formula are as follows:
I0i=3 ω U0iC0i
Wherein: U0iFor the virtual value of the residual voltage of test point i；C0iFor the electricity between test point i downstream line and the earth
Hold.
Preferably, zero-sequence current information described in step b1-2 includes the starting time of zero-sequence current, and distribution terminal is certainly
The terminal address of body and the amplitude of zero-sequence current.
Preferably, Web broadcast described in step b listens to subprogram, includes the following steps:
Step b2-1, distribution terminal judge whether to have received the zero sequence starting that other distribution terminals issue in distribution network
Broadcast message executes step b2-2, obtains simultaneously if having received the zero sequence starting broadcast message of other distribution terminals sending
The zero-sequence current information that the distribution terminal issues is returned if not receiving the zero sequence starting broadcast message of other distribution terminals sending
Return the step a；
Step b2-2, the distribution terminal zero sequence that other distribution terminals issue in receiving distribution network start broadcast message
Later, the zero-sequence current starting record of itself is inquired；
Step b2-3, distribution terminal judgement is interior in predetermined time interval, and whether there is also have zero-sequence current starting for itself
Record, if itself executes the step c there is also there is zero-sequence current starting record, if there are zero sequence electricity for itself
Stream starting record, executes the step f.
Preferably, zero-sequence current amplitude calculation formula described in step c are as follows:
T0Indicate that any interval of time after breaking down in distribution network, i (t) indicate the instantaneous of zero-sequence current
Value.
Preferably, neighborhood testing process described in step e and step f, includes the following steps:
Step d1, neighborhood detect distribution terminal and issue inquiry instruction to its adjacent distribution terminal；
Step d2, neighborhood detect distribution terminal and issue request instruction to adjacent distribution terminal, request adjacent distribution whole
End upload query information, query information include the information of switch corresponding to distribution terminal, corresponding switch location information with
And zero-sequence current shape information；
Step d3, neighborhood detection distribution terminal successively receive the transient state neighborhood electric current letter of all adjacent distribution terminal transmission
Breath；
Step d4, neighborhood detects distribution terminal to be believed according to the zero-sequence current waveform that the adjacent distribution terminal received is sent into
Breath, the zero-sequence current waveform recorded according to its own are compared calculating two-by-two, successively calculate its own and adjacent distribution terminal
Zero-sequence current waveform zero-sequence current similarity factor；
Step d5, neighborhood detection distribution terminal distribution terminal adjacent thereto complete the meter of zero-sequence current similarity factor two-by-two
After calculation, using the corresponding distribution terminal of a value the smallest in zero-sequence current similarity factor as suspected malfunctions distribution terminal,
Section between suspected malfunctions distribution terminal and neighborhood detection distribution terminal is suspected malfunctions section；
It is predetermined whether the zero-sequence current similarity factor selected in step d6, neighborhood detection distribution terminal judgment step d5 is less than
Threshold value executes step d7 if it is less than predetermined threshold, if it is larger than or equal to predetermined threshold, executes step d8；
Step d7, the section between the suspected malfunctions distribution terminal determined in step d5 and neighborhood detection distribution terminal is true
It is set to fault section, and judging result is reported into main website；
Step d8, the section between the suspected malfunctions distribution terminal determined in step d5 and neighborhood detection distribution terminal is true
It is set to suspected malfunctions section, and judging result is reported into main website.
Preferably, the calculation formula of zero-sequence current similarity factor described in step d4 are as follows:
Wherein, ρ is zero-sequence current similarity factor；TtFor the maximum time error of distribution terminal information exchange；To more than note
The current data for recording range [0, T] is replaced with 0, i0,k(t) and i0,k+1(t) it is respectively zero sequence that adjacent 2 distribution terminals detect
Electric current；τ is that the translation of zero-sequence current information is counted.
Compared with prior art, the present invention has the beneficial effects that
1, the method positioned by this distribution small current grounding fault is not necessarily to main website in the decision process of fault section
It participates in, adaptability is wide and reliability is higher.
2, distribution terminal starts reliable, prevents from failing to report.As soon as will start neighborhood detection journey as long as there is a distribution terminal to start
Sequence.
3, field detection program transfers the data of adjacent distribution terminal using inquiry instruction, and the data utilized are comprehensive, uses
Transient-wave analogue method calculates similarity factor two-by-two, sets confidence level threshold values, prevents from reporting by mistake.
4, when using fiber optic communication, device intercommunication ensure that the real-time for transferring recorder data within 10ms,
When using wireless communication, the length needs of recorder data are set according to channel situation before failure.
5, after line failure, it can timely find abort situation and timely handle, avoid to power distribution network electricity
Force system causes more serious loss.This method does not depend on main website, and locating speed is fast, is remarkably improved power supply reliability.
Detailed description of the invention
Fig. 1 is the method flow diagram of distributed small current grounding fault positioning.
Fig. 2 is that the method neighborhood of distributed small current grounding fault positioning detects program flow diagram.
Fig. 3 is distribution FA system structure diagram.
Specific embodiment
Fig. 1~3 are highly preferred embodiment of the present invention, and 1~3 the present invention will be further described with reference to the accompanying drawing.
As shown in Figure 1, a kind of method of distribution small current grounding fault positioning, includes the following steps:
Step 1001, start；
The method for starting to execute distributed small current grounding fault positioning.
Step 1002, it initializes；
System is initialized.
Step 1003, the sampling of zero-sequence current, recording；
Power distribution network distribution terminal STU (hereinafter referred to as distribution terminal) in distribution network, to the zero sequence electricity in distribution network
Stream carries out the record of sampling and waveform.
Step 1004, zero-sequence current Sudden Changing Rate is detected, network broadcast information is listened to；
Distribution terminal during being sampled to the zero-sequence current in distribution network to the Sudden Changing Rate of zero-sequence current into
Row detection, while listening to the broadcast message that other distribution terminals issue in distribution network；
After executing completion step 1004, distribution terminal is performed simultaneously zero-sequence current monitoring subprogram and Web broadcast is listened to
Subprogram, wherein zero-sequence current monitoring subprogram includes the following steps:
Step 1005-1, if detect that zero-sequence current Sudden Changing Rate starts information,
Distribution terminal judges whether to detect that zero-sequence current Sudden Changing Rate starts by the detection to zero-sequence current in power distribution network
Information executes step 1005-2 if detecting that zero-sequence current Sudden Changing Rate starts information, if zero-sequence current mutation is not detected
Amount starting information, return step 1003.
Distribution terminal judges whether to detect zero-sequence current Sudden Changing Rate starting information i.e. distribution terminal judgement detects zero
Whether sequence jump-value of current reaches the entry condition of its own starting, when detecting that zero-sequence current Sudden Changing Rate starts information, table
Show that the zero-sequence current Sudden Changing Rate detected reaches the entry condition of its own starting, distribution terminal starting；If distribution terminal is not
Detect that zero-sequence current Sudden Changing Rate starts information, the zero-sequence current Sudden Changing Rate that expression distribution terminal detects is not up to its own and opens
Dynamic entry condition, distribution terminal continue to detect the zero-sequence current in distribution network.
Distribution terminal judges whether the entry condition for reaching its own starting are as follows: the zero sequence electricity that distribution terminal obtains sampling
Stream signal is compared with threshold value set in advance, if the amplitude of at least 2 sampled points is big in 3 continuous sampled points
In threshold value, then it represents that reached the entry condition of distribution terminal itself starting, threshold value IstCalculation formula are as follows:
Ist=KrelI0i(formula 1)
Wherein, KrelFor coefficient of reliability, I0iFor the virtual value of i sections of capacitance currents between downstream line and the earth, I0i's
Calculation formula are as follows:
I0i=3 ω U0iC0i(formula 2)
Wherein: U0iFor the virtual value of the residual voltage of test point i；C0iFor the electricity between test point i downstream line and the earth
Hold.
Distribution terminal after start-up, using the Sudden Changing Rate of zero-sequence current as boundary, is put into three cycles before record Sudden Changing Rate
The waveform of five cycles (128 points of each cycle) later.
Step 1005-2 starts information to Web broadcast zero-sequence current；
When distribution terminal starts, the zero-sequence current information itself detected is broadcasted to distribution network.
The zero-sequence current information that distribution terminal is sent includes the starting time of zero-sequence current, the terminal of distribution terminal itself
The amplitude of location and zero-sequence current.
Step 1005-3, if receive other zero-sequence currents starting information；
Distribution terminal judged within scheduled interval time, if receives what other distribution terminals in distribution network issued
Zero-sequence current broadcast message executes step 1007, such as if receiving the zero-sequence current information that the broadcast of other distribution terminals issues
Fruit does not receive, executes step 1010.
Above-mentioned Web broadcast listens to subprogram, includes the following steps:
Step 1006-1, if receive the starting broadcast of network zero curve；
Distribution terminal judges whether to have received the zero sequence broadcast message that other distribution terminals issue in distribution network, if
The zero sequence starting broadcast message for having received the sending of other distribution terminals, executes step 1006-2, while obtaining the distribution terminal
The zero-sequence current information of sending, if not receiving the zero sequence starting broadcast message of other distribution terminals sending, return step 1004.
Step 1006-2 inquires this terminal zero sequence current start record；
After the distribution terminal zero sequence that other distribution terminals issue in receiving distribution network starting broadcast message, inquiry
The zero-sequence current of itself starts record.
Step 1006-3 judges whether there is starting record；
In distribution terminal judgement in predetermined time interval, whether itself is there is also there is starting to record, if itself is also deposited
There is starting to record, executing step 1007, if there are startings to record for itself, is executing step 1010.
Step 1007, the zero-sequence current information for comparing this terminal and receiving；
The zero-sequence current that distribution terminal broadcasts the zero-sequence current information of self record with other distribution terminals received
Information is compared.
Step 1008, the biggish distribution terminal of zero-sequence current amplitude is selected；
After distribution terminal progress zero-sequence current information relatively finishes, wherein the biggish zero-sequence current of current amplitude is believed for confirmation
The corresponding distribution terminal of breath detects distribution terminal as neighborhood.
Certain time interval T0Interior zero-sequence current amplitude calculation formula are as follows:
T0Indicate that the interval of time after breaking down in distribution network, i indicate the instantaneous value of zero-sequence current.T0Choosing
It takes to follow and as often as possible retains transient signal and retain power frequency component as little as possible.
Step 1009, start neighborhood testing process.
The neighborhood detection distribution terminal determined in step 1008 starts neighborhood testing process.
Step 1010, terminate；
The section that failure occurs, the method knot of distributed small current grounding fault positioning are determined using neighborhood testing process
Beam.
As shown in Fig. 2, above-mentioned neighborhood testing process, includes the following steps:
Step 2001, start；
Start to carry out neighborhood testing process.
Step 2002, network topological information is inquired；
Neighborhood detection distribution terminal passes through the network topology established in advance and issues inquiry instruction to its adjacent distribution terminal.
For the network topology method for building up of distribution network application No. is 201310235211.9, patent name is a kind of distribution
It has been documented in the Chinese patent of network control application network topology automatic identification method, details are not described herein.
Step 2003, the instruction that request sends query information is sent to adjacent end；
Neighborhood detects distribution terminal and issues request instruction to adjacent distribution terminal, requests adjacent distribution terminal to upload and looks into
Information is ask, query information includes the information of switch corresponding to distribution terminal, the location information of corresponding switch and zero sequence electricity
Flow shape information.
Step 2004, the zero-sequence current information of adjacent end is received；
Neighborhood detection distribution terminal successively receives the transient state field current information of all adjacent distribution terminal transmission.
Step 2005, zero-sequence current similarity factor is calculated；
Neighborhood detects the zero-sequence current shape information that distribution terminal is sent into according to the adjacent distribution terminal received, according to it
The zero-sequence current waveform of self record is compared calculating two-by-two, successively calculates the zero-sequence current of its own and adjacent distribution terminal
The zero-sequence current similarity factor of waveform.
Since in practical applications, two different distribution terminals are difficult to accomplish when carrying out the extraction of transient current waveform
It is synchronous.Therefore, when carrying out the calculating of zero-sequence current similarity factor in this neighborhood testing process, come using the method that data window translates
Solve the problems, such as that data are nonsynchronous, i.e., first fix the waveform of one of transient current, allow another transient current waveform into
Row translation, the every translation of waveform once just calculate a related coefficient, then find out a series of related coefficient of transient currents, then
The maximum take absolute value as transient current zero-sequence current similarity factor.The calculation formula of zero-sequence current similarity factor are as follows:
Wherein, ρ is zero-sequence current similarity factor；TtFor the maximum time error of FTU information exchange；To more than recording interval
The current data of [0, T] is filled with 0.i0,kAnd i0,k+1The zero-sequence current that respectively adjacent 2 distribution terminals detect；τ is zero sequence
The translation of current signal is counted.
Step 2006, select the smallest section of zero-sequence current similarity factor as suspected malfunctions section；
After neighborhood detection distribution terminal distribution terminal adjacent thereto completes the calculating of zero-sequence current similarity factor two-by-two,
Using the corresponding distribution terminal of a value the smallest in zero-sequence current similarity factor as suspected malfunctions distribution terminal, suspected malfunctions
Section between distribution terminal and neighborhood detection distribution terminal is suspected malfunctions section.
Step 2007, whether zero-sequence current similarity factor is less than 0.5；
Whether neighborhood detects the zero-sequence current similarity factor selected in distribution terminal judgment step 2006 less than 0.5, if
Less than 0.5, step 2008 is executed, if it is larger than or equal to 0.5, executes step 2009.
Step 2008, confirm fault section, report main website；
Section between the strange land failure distribution terminal determined in step 2006 and neighborhood detection distribution terminal is determined as
Fault section, and judging result is reported into main website.
Step 2009, suspected malfunctions section reports main website；
Section between the strange land failure distribution terminal determined in step 2006 and neighborhood detection distribution terminal is determined as
Suspected malfunctions section, and judging result is reported into main website.
Step 2010, terminate；
The execution of neighborhood testing process terminates.
Specific work process and working principle are as follows:
In distributed FA system as shown in Figure 3, including two outlet switchs: outlet switch QS1~QS2, outlet are opened
It closes QS1~QS2 and respectively corresponds distribution terminal: distribution terminal FTUA~FTUB.In distributed FA system, further include just like
Lower switch: switch Q1~Q3, switch Q11~Q13 and switch Q21~Q23, each switch are correspondingly arranged on a distribution
Terminal, and all distribution terminals in distribution FA system access in lan network.
As shown in Figure 3, it is assumed that failure occurs between switch Q3 and switch Q13, after failure occurs, corresponding to switch Q3
Can only terminal always to zero-sequence current sampling and recording status, the zero-sequence current that the distribution terminal corresponding to the switch Q3 detects
After data reach the entry condition of its own, distribution terminal corresponding to switch Q3 starting, distribution terminal after start-up, with
The Sudden Changing Rate of zero-sequence current is boundary, is put into three cycles and five cycles (128, each cycle later before record Sudden Changing Rate
Point) waveform, and to Web broadcast, it broadcasts the zero-sequence current information itself detected to distribution network simultaneously.Switch Q3 is adjacent
Distribution terminal receive the broadcast of switch Q3 after, calculate zero-sequence current amplitude, most due to abort situation and the position switch Q3
Closely, therefore switch Q3 is confirmed as neighborhood detection distribution terminal, and starts neighborhood detection program.
After distribution terminal corresponding to switch Q3 starts neighborhood detection program, general network is opened up according to preformed, to
Its adjacent distribution terminal (distribution terminal FTU1, distribution terminal FTU2 and distribution terminal FTU4) issues request, requests adjacent
Intelligent terminal sends query information.In adjacent distribution terminal (distribution terminal FTU1, distribution terminal FTU2 and distribution terminal
FTU4 after) the corresponding distribution terminal of Xiang Kaiguan Q3 sends respective query information, the corresponding distribution terminal of switch Q3 is counted two-by-two
The zero-sequence current similarity factor between adjacent distribution terminal is calculated, and is selected in all zero-sequence current similarity factors being calculated
The corresponding distribution terminal of minimum value, and using the section between distribution terminal corresponding to switch Q3 and the distribution terminal as doubtful
Fault section, then judge again the value of zero-sequence current similarity factor whether less than 0.5, it is if it is less than 0.5 that the section is true
It is set to fault section, and reports main website, if being not less than 0.5, using the section as suspected malfunctions section, and reports main website,
Main website carries out the isolation of failure and and other sections restores electricity.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
Imitate embodiment.But without departing from the technical solutions of the present invention, according to the technical essence of the invention to above embodiments institute
Any simple modification, equivalent variations and the remodeling made, still fall within the protection scope of technical solution of the present invention.
Claims (8)
1. a kind of method of distribution small current grounding fault positioning, characterized by the following steps:
Step a, the distribution terminal in distribution network carry out the record of sampling and waveform to the zero-sequence current in distribution network；
Step b, distribution terminal execute the process that zero-sequence current monitoring subprogram samples the zero-sequence current in distribution network
In zero-sequence current information is detected and is handled, while listening to subprogram using Web broadcast and listening to and handle in distribution network
The zero-sequence current information that other distribution terminals issue；
Step c, the zero sequence electricity that distribution terminal broadcasts the zero-sequence current information of self record with other distribution terminals received
Stream information carries out the calculating of amplitude using zero-sequence current amplitude calculation formula respectively, and carries out the comparison of zero-sequence current amplitude；
Step d confirms the wherein biggish zero-sequence current of current amplitude after distribution terminal progress zero-sequence current information relatively finishes
Distribution terminal corresponding to information detects distribution terminal as neighborhood；
Step e starts neighborhood testing process by the neighborhood detection distribution terminal determined in step d；
Step f judges fault section or suspected malfunctions section using neighborhood testing process, and fault location is completed.
2. the method for distribution small current grounding fault positioning according to claim 1, it is characterised in that: institute in step b
The zero-sequence current monitoring subprogram stated, includes the following steps:
Step b1-1, distribution terminal detect the zero-sequence current information in distribution network, and distribution terminal judgement detects
Whether zero-sequence current information reaches distribution terminal itself entry condition, if reaching distribution terminal itself entry condition, executes step
Rapid b1-2 returns to the step a if not up to distribution terminal itself entry condition；
Step b1-2 broadcasts the zero-sequence current information itself detected to distribution network after distribution terminal starting；
Step b1-3, distribution terminal judged within scheduled interval time, if receive other distribution terminals in distribution network
The zero-sequence current information of sending executes the step if receiving the zero-sequence current information that the broadcast of other distribution terminals issues
Rapid c executes the step f if do not received.
3. the method for distribution small current grounding fault positioning according to claim 2, it is characterised in that: in step b1-1
The judgment basis of itself entry condition of the distribution terminal are as follows: zero-sequence current information that distribution terminal will test and in advance
The threshold value of setting is compared, if the amplitude of at least 2 sampled points is greater than threshold value in 3 continuous sampled points,
Indicate that zero-sequence current information has reached distribution terminal itself entry condition, threshold value IstCalculation formula are as follows:
Ist=KrelI0i
Wherein, KrelFor coefficient of reliability, I0iFor the virtual value of i sections of capacitance currents between downstream line and the earth, I0iCalculating it is public
Formula are as follows:
I0i=3 ω U0iC0i
Wherein: U0iFor the virtual value of the residual voltage of test point i；C0iFor the capacitor between test point i downstream line and the earth.
4. the method for distribution small current grounding fault positioning according to claim 2, it is characterised in that: in step b1-2
The zero-sequence current information includes the starting time of zero-sequence current, the terminal address of distribution terminal itself and zero-sequence current
Amplitude.
5. the method for distribution small current grounding fault positioning according to claim 1, it is characterised in that: institute in step b
The Web broadcast stated listens to subprogram, includes the following steps:
Step b2-1, distribution terminal judge whether to have received the zero sequence starting broadcast that other distribution terminals issue in distribution network
Information executes step b2-2, while obtaining this and matching if having received the zero sequence starting broadcast message of other distribution terminals sending
The zero-sequence current information that electric terminals issue returns to institute if not receiving the zero sequence starting broadcast message of other distribution terminals sending
The step a stated；
Step b2-2, distribution terminal in receiving distribution network other distribution terminals issue zero sequence starting broadcast message it
Afterwards, the zero-sequence current starting record of itself is inquired；
Step b2-3, distribution terminal judgement in predetermined time interval in, itself whether there is also have zero-sequence current starting record,
If itself executes the step c, if there are zero-sequence current startings for itself there is also there is zero-sequence current starting record
Record executes the step f.
6. the method for distribution small current grounding fault positioning according to claim 1, it is characterised in that: institute in step c
The zero-sequence current amplitude calculation formula stated are as follows:
T0Indicate that any interval of time after breaking down in distribution network, i (t) indicate the instantaneous value of zero-sequence current.
7. it is according to claim 1 distribution small current grounding fault positioning method, it is characterised in that: step e and
Neighborhood testing process, includes the following steps: described in step f
Step d1, neighborhood detect distribution terminal and issue inquiry instruction to its adjacent distribution terminal；
Step d2, neighborhood detect distribution terminal and issue request instruction to adjacent distribution terminal, request on adjacent distribution terminal
Query information is passed, query information includes the location information and zero of the information of switch corresponding to distribution terminal, corresponding switch
Sequence current waveform information；
Step d3, neighborhood detection distribution terminal successively receive the transient state neighborhood current information of all adjacent distribution terminal transmission；
Step d4, neighborhood detect the zero-sequence current shape information that distribution terminal is sent into according to the adjacent distribution terminal received, root
Compared calculating two-by-two according to its own zero-sequence current waveform recorded, successively calculates the zero sequence of its own and adjacent distribution terminal
The zero-sequence current similarity factor of current waveform；
Step d5, neighborhood detection distribution terminal distribution terminal adjacent thereto complete two-by-two zero-sequence current similarity factor calculating it
Afterwards, doubtful using the corresponding distribution terminal of a value the smallest in zero-sequence current similarity factor as suspected malfunctions distribution terminal
Section between failure distribution terminal and neighborhood detection distribution terminal is suspected malfunctions section；
Whether the zero-sequence current similarity factor selected in step d6, neighborhood detection distribution terminal judgment step d5 is less than predetermined threshold
Value executes step d7 if it is less than predetermined threshold, if it is larger than or equal to predetermined threshold, executes step d8；
Section between the suspected malfunctions distribution terminal determined in step d5 and neighborhood detection distribution terminal is determined as by step d7
Fault section, and judging result is reported into main website；
Section between the suspected malfunctions distribution terminal determined in step d5 and neighborhood detection distribution terminal is determined as by step d8
Suspected malfunctions section, and judging result is reported into main website.
8. the method for distribution small current grounding fault positioning according to claim 7, it is characterised in that: institute in step d4
The calculation formula for the zero-sequence current similarity factor stated are as follows:
Wherein, ρ is zero-sequence current similarity factor；TtFor the maximum time error of distribution terminal information exchange；To more than recording interval
The current data of [0, T] is replaced with 0, i0,k(t) and i0,k+1(t) it is respectively zero-sequence current that adjacent 2 distribution terminals detect；τ
It counts for the translation of zero-sequence current information.
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| CN201610740042.8A CN106338676B (en) | 2016-08-26 | 2016-08-26 | A kind of method of distribution small current grounding fault positioning |
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| CN201610740042.8A CN106338676B (en) | 2016-08-26 | 2016-08-26 | A kind of method of distribution small current grounding fault positioning |
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| CN107422223B (en) * | 2016-12-28 | 2019-11-01 | 国网福建省电力有限公司 | A kind of method of distribution small current grounding fault positioning |
| CN107037322B (en) * | 2017-04-14 | 2019-12-17 | 积成电子股份有限公司 | power distribution network low-current grounding fault positioning method based on steady-state characteristics |
| CN107340449B (en) * | 2017-06-16 | 2020-05-05 | 国网福建省电力有限公司 | Single-phase earth fault positioning method and system adopting self-adaptive hybrid earth mode |
| CN107271853A (en) * | 2017-07-22 | 2017-10-20 | 国网福建省电力有限公司 | Electrical power distribution automatization system distribution low current grounding localization method and system |
| CN109387748A (en) * | 2018-12-21 | 2019-02-26 | 云南电网有限责任公司电力科学研究院 | A kind of power distribution network distribution small current grounding fault localization method and device |
| CN109655713B (en) * | 2019-01-18 | 2021-07-02 | 国网江苏省电力有限公司电力科学研究院 | Single-phase earth fault positioning method and system |
| CN110568300B (en) * | 2019-06-24 | 2021-07-13 | 昆明理工大学 | Power distribution network single-phase earth fault identification method based on multi-source information |
| CN113075500A (en) * | 2021-03-22 | 2021-07-06 | 广西电网有限责任公司河池供电局 | Similarity single-phase earth fault positioning method based on sliding window and application |
| CN113347060B (en) * | 2021-05-27 | 2022-12-09 | 广西电网有限责任公司 | Method, device and system for detecting power network fault based on process automation |
| CN113625123A (en) * | 2021-09-07 | 2021-11-09 | 威胜电气有限公司 | Single-phase earth fault positioning method for power distribution network |
| CN114966326B (en) * | 2022-08-01 | 2022-11-11 | 国家电网有限公司 | Single-phase earth fault section positioning method and system based on current negative sequence fault |
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Denomination of invention: A Distributed Method of Small Current Grounding Fault Location Effective date of registration: 20230116 Granted publication date: 20190426 Pledgee: Shandong Zhangdian Rural Commercial Bank Co.,Ltd. Pledgor: SHANDONG KEHUI POWER AUTOMATION Co.,Ltd. Registration number: Y2023980031349 |