CN107884679A - Small current Earth design method based on transient zero-sequence current signal characteristic - Google Patents
Small current Earth design method based on transient zero-sequence current signal characteristic Download PDFInfo
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- CN107884679A CN107884679A CN201711027407.3A CN201711027407A CN107884679A CN 107884679 A CN107884679 A CN 107884679A CN 201711027407 A CN201711027407 A CN 201711027407A CN 107884679 A CN107884679 A CN 107884679A
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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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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Abstract
Small current Earth design method based on transient zero-sequence current signal characteristic, belongs to technical field of electric power automation.It is characterised in that it includes following steps：Step a, start Intelligent power distribution terminal small current ground fault detection function；Step b, set and start threshold value；Step c, judge that zero-sequence current starts and whether succeed；Step d, record the fault initiating time；Step e, extract and upload characteristic information；Step f, main website carry out packet；Step g, obtain suspected malfunctions section.Step h, main website are weighted；Whether step i, the confidence coefficient after weighted calculation are more than numerical upper limits, more than being then otherwise fault section is non-faulting section.The characteristic information for the transient zero-sequence current that main website uploads according to Intelligent power distribution terminal carries out the judgement of fault section, and the requirement to communication quality substantially reduces, poor especially suitable for communication condition, it is impossible to transmits the network system from far-off regions of mass data.
Description
Technical field
Small current Earth design method based on transient zero-sequence current signal characteristic, belongs to power automation technology
Field.
Background technology
The widely used non-effective earthing mode of China's power distribution network, when low current singlephase earth fault occurs for system, failure
Electric current very little, fault-signal is faint, causes fault detect, route selection, positioning all highly difficult.Low current grounding occurs for circuit
Afterwards, three-phase voltage is still symmetrical, so system can run a period of time, improves the reliability of power supply.But if event with ground
Hinder longtime running, easily expand failure, bring bigger harm.It can be seen that finding the position of singlephase earth fault in time, and locate in time
Reason, to improving power supply reliability, ensureing that controller switching equipment tool safe for operation is of great significance.
In the prior art, a kind of mode of solution be present is that the signal of transient zero-sequence current is used into high speed acquisition system
Gather and be uploaded to main website, main website determines fault section using the method for waveform comparison, due to transient zero-sequence signal frequency compared with
Height, therefore the data volume that needs transmit during waveform upload is very big, institute is very high to QoS requirement by this way, for communication
The network system from far-off regions of condition difference, the method for this waveform comparison can not be applicable.
The content of the invention
The technical problem to be solved in the present invention is：Overcome the deficiencies in the prior art, there is provided a kind of main website is according to intelligent power distribution
The characteristic information for the transient zero-sequence current that terminal uploads carries out the judgement of suspected malfunctions section and finally determines fault section, to logical
The requirement of letter quality substantially reduces, poor especially suitable for communication condition, it is impossible to transmit the network system from far-off regions of mass data
The small current Earth design method based on transient zero-sequence current signal characteristic.
The technical solution adopted for the present invention to solve the technical problems is：This is based in transient zero-sequence current signal characteristic
Low current grounding localization method, a plurality of outlet for being provided with substation bus bar and being drawn from substation bus bar, in outlet
On upstream to downstream is provided with transformer station's outlet switch and multiple line sectionalizings switch, in transformer station's outlet switch and circuit point
Intelligent power distribution terminal is separately installed with Duan Kaiguan, all Intelligent power distribution terminals are connected with main website, it is characterised in that：Including as follows
Step：
Step a, start Intelligent power distribution terminal small current ground fault detection function；
Step b, the startup threshold value of zero-sequence current is set by Intelligent power distribution terminal；
Step c, Intelligent power distribution terminal according to the startup threshold value of setting compared with the sampled signal to zero-sequence current, according to
Whether entry condition judges that zero-sequence current starts and succeeds, if started successfully, performs step d, if not actuated success, returns to step
Rapid a；
Step d, after Intelligent power distribution terminal starts, the Intelligent power distribution terminal record fault initiating time；
Step e, Intelligent power distribution terminal carry out the extraction of characteristic information to transient zero-sequence current, and by the characteristic information extracted
Reach main website；
Step f, after main website receives the characteristic information of the transient zero-sequence current of Intelligent power distribution terminal upload, main website is according to channel
The transmission delay time is grouped to data；
Step g, the characteristic information of main website combination transient zero-sequence current signal, according to suspected malfunctions section judgment basis, judges
To suspected malfunctions section；
The suspected malfunctions section judgment basis in step g is weighted for step h, main website；
Whether step i, the confidence coefficient after step h weighted calculations are more than numerical upper limits, if greater than numerical upper limits, perform step
Rapid 1011, if less than equal to numerical upper limits, perform step 1012；
Step j, the section that the confidence coefficient after step h weighted calculations is more than numerical upper limits are confirmed as fault section；
Step k, the confidence coefficient after step h weighted calculations are less than or equal to numerical upper limits, and the section is non-faulting section, failure
The judgement of section terminates.
Preferably, the entry condition of the zero-sequence current described in step c is：The zero sequence that Intelligent power distribution terminal obtains to sampling
Current sampling signal is compared with startup threshold value set in advance, and in continuous 1/8 power frequency period, zero-sequence current is adopted
The amplitude of sample signal exceedes startup threshold value and once remembers+1, once remembers -1 less than threshold value is started, adds up, finally give successively
Accumulating values M, if M>0, then it represents that Intelligent power distribution terminal starts, doubtful generation small current earth fault in circuit；If M
≤ 0, then Intelligent power distribution terminal do not start, continue to sample transient current and before counting zero.
Preferably, the characteristic information described in step e is：The latter power frequency of small current earth fault occurs in circuit
In cycle, amplitude, phase angle and the frequency of transient zero-sequence current signal；Wherein amplitude and phase angle are calculated using Fourier algorithm
Arrive, frequency is calculated using zero crossing calculating method.
Preferably, the suspected malfunctions section judgment basis described in step g includes：
Amplitude criterion：What main website filtered out within effective time all Intelligent power distribution terminals reports information, searches each zero sequence electricity
The maximum Intelligent power distribution terminal of signal amplitude is flowed, on the basis of Intelligent power distribution terminal, zero-sequence current amplitude jump is searched to its both sides
Become section, when two neighboring transient zero-sequence current amplitude changes more than 50%, then the section is suspected malfunctions section；
Phase angle criterion：Main website filter out within effective time it is all can only Intelligent power distribution terminal report information, search it is each temporarily
The initial phase of state zero sequence current signal, since the Intelligent power distribution terminal of transformer station's outlet switch, zero sequence is searched to line side
The section that electric current initial phase is overturn, when the zero-sequence current initial phase difference △ β of two test points are in：150 ° of ＜ △ β ＜
At 210 °, then section is overturn for phase, the section is suspected malfunctions section；
Frequency criterion：What main website filtered out within effective time all Intelligent power distribution terminals reports information, searches each transient state zero
The frequency of sequence current signal, since the Intelligent power distribution terminal of transformer station's outlet switch, zero-sequence current frequency is searched to line side
Transition section, when two neighboring transient zero-sequence current frequency changes more than 50%, then judge the section for suspected malfunctions section.
Preferably, the numerical upper limits described in step i are 0.5.
Preferably, when suspected malfunctions section judgment basis is weighted step h, wherein amplitude criterion, phase angle
Criterion and the confidence coefficient of frequency criterion are respectively 0.4,0.4 and 0.2.
Preferably, for wire transmission mode, the span of the transmission delay time described in step f is 20ms
~200ms；For wireless transmission method, the span of the transmission delay time described in step f is 1s ~ 5s.
Compared with prior art, beneficial effect possessed by the present invention is：
In the small current Earth design method based on transient zero-sequence current signal characteristic, main website is according to intelligent power distribution
The characteristic information for the transient zero-sequence current that terminal uploads carries out the judgement of suspected malfunctions section and finally determines fault section, to logical
The requirement of letter quality substantially reduces, poor especially suitable for communication condition, it is impossible to transmit the network system from far-off regions of mass data.
Compared to more traditional waveform comparison method, without uploading mass data, distribution terminal, communication channel requirement are substantially reduced, reduced
System cost.And the transient signal that each test point of circuit records when low current grounding is utilized in this method, will
Transient signal directly uploads, only in local monitoring device（Intelligent power distribution terminal）It is middle to come out the feature extraction of transient signal,
The feature of transient signal is uploaded, weighting algorithm is used in positioning master station, the transient signal informix sent by utilizes, the hair
It is bright to improve the degree of accuracy of fault location under conditions of communication channel difference, and system cost is reduced, applied widely, side
Method is simple and easily realizes.
Brief description of the drawings
Fig. 1 is the small current Earth design method flow diagram based on transient zero-sequence current signal characteristic.
Fig. 2 is the small current Earth design method power network line and zero based on transient zero-sequence current signal characteristic
Sequence current characteristic information schematic diagram.
Wherein：1st, substation bus bar 2, transformer station's outlet switch 3, line sectionalizing switch 4, zero-sequence current waveform
5th, outlet 6, trouble point.
Embodiment
Fig. 1 ~ 2 are highly preferred embodiment of the present invention, and 1 ~ 2 the present invention will be further described below in conjunction with the accompanying drawings.
As shown in figure 1, the small current Earth design method based on transient zero-sequence current signal characteristic, including it is as follows
Step：
Step 1001, start；
Proceed by the small current Earth design method based on transient zero-sequence current signal characteristic.
Step 1002, Intelligent power distribution terminal small current ground fault detection function is started.
Step 1003, Intelligent power distribution terminal is set to start threshold value；
After small current earth fault occurs in circuit, the zero-sequence current in circuit can undergo mutation, by being installed on power transformation
After the Intelligent power distribution terminal setting on outlet switch 2 and line sectionalizing switch 3 of standing is broken down, because transient zero-sequence current is dashed forward
Variable and the startup threshold value for triggering Intelligent power distribution terminal.
Step 1004, whether Sudden Changing Rate starts and succeeds；
Intelligent power distribution terminal according to the startup threshold value of setting compared with the sampled signal to zero-sequence current, according to trip bar
Whether part judges that zero-sequence current starts and succeeds, if started successfully, step 1005 is performed, if not actuated success, return to step
1002；
The entry condition of zero-sequence current is：Intelligent power distribution terminal to the obtained zero-sequence current sampled signal of sampling with it is set in advance
Start threshold value to be compared, in continuous 1/8 power frequency period data, the amplitude of zero-sequence current sampled signal, which exceedes, to be started
Threshold value once remembers+1, once remembers -1 less than threshold value is started, adds up successively, the accumulating values M finally given, if M>0, then
Represent that Intelligent power distribution terminal starts, doubtful generation small current earth fault in circuit；If M≤0, Intelligent power distribution terminal is not
Start, continue to sample transient current and counting before is zeroed.
Step 1005, the fault initiating time is recorded；
After Intelligent power distribution terminal starts, the Intelligent power distribution terminal record fault initiating time.
Step 1006, extract and upload the characteristic information of transient zero-sequence current signal；
Intelligent power distribution terminal carries out the extraction of characteristic information to transient zero-sequence current, and the characteristic information extracted is uploaded into master
Stand.The characteristic information of the transient zero-sequence current of required extraction is：The latter work of small current earth fault occurs in circuit
In the frequency cycle, amplitude, phase angle and the frequency of transient zero-sequence current signal.Wherein amplitude and phase angle are calculated using Fourier algorithm
Arrive, frequency is calculated using zero crossing calculating method.
Step 1007, main website is grouped to the characteristic information of transient zero-sequence current signal；
After main website receives the characteristic information of the transient zero-sequence current of Intelligent power distribution terminal upload, main website prolongs according to transmission
When the time data are grouped.
In the prior art, main website receive and Intelligent power distribution terminal between data transfer mode be divided into wire transmission and
Two kinds are wirelessly transferred, the wherein mode of wire transmission typically realizes that the communication reliability of wire transmission mode is higher using optical fiber,
Signal transmission delay is smaller；The mode being wirelessly transferred typically realizes that communication reliability is poor under wireless transmission method using GPRS, passes
Defeated delay is big.Therefore for wire transmission mode, signal transmission delay time T span is 20ms ~ 200ms；It is right
For wireless transmission method, signal transmission delay time T span is 1s ~ 5s.
It needs to be emphasized that no matter for wire transmission mode or wireless transmission method, the transmission of above-mentioned signal
Delay time T span is used for a certain determination value for determining signal transmission delay time T, and is not transient zero-sequence current
Characteristic information packet time span.Specifically：Such as under wire communication mode, when the signal transmission delay time
After T is determined（Such as 100ms）, main website is handled the data in 0ms ~ 100ms as the data of same primary fault, and is not
Handled using the data of 20ms ~ 200ms or 20ms ~ 100ms also or in 100ms ~ 200ms as the data of same primary fault,
Data i.e. in 0ms ~ 20ms should not be excluded, under wireless communication mode similarly.
Step 1008, suspected malfunctions section is determined；
The characteristic information of main website combination transient zero-sequence current signal, judgement obtain suspected malfunctions section.
With reference to Fig. 2, a plurality of outlet 5 is led on substation bus bar 1, in each outlet 5, from the upstream of outlet 5
Transformer station's outlet switch 2 and multiple line sectionalizings switch 3 are disposed with to downstream, as described above, going out in all transformer stations
Intelligent power distribution terminal is mounted on wiretap 2 and line sectionalizing switch 3, Intelligent power distribution terminal is connected with main website.
Assuming that the trouble point 6 of small current earth fault occurs in any one outlet 5, now power distribution network is with trouble point
6 be with reference to being divided into two parts：The wherein sound outlet 5 of the lines upstream of trouble point 6, transformer station's outlet switch 2 and transformer station
For system side, the downstream line of trouble point 6 is line side, and the wherein direct-to-ground capacitance of system side is than the direct-to-ground capacitance in line side bigger
It is more.Therefore also very big by caused transient zero-sequence current signal characteristic difference over the ground, it is specifically distinguished as：
1st, the amplitude of the zero-sequence current waveform 4 of the system side of trouble point 6 changes successively, and bigger closer to trouble point 6；2nd, trouble point
The initial phase of the zero-sequence current waveform 4 of 6 system sides is consistent, the initial phase phase of the zero-sequence current waveform 4 in the line side of trouble point 6
Instead；3rd, the frequency of oscillation of the zero-sequence current waveform 4 of the system side of trouble point 6 is basically identical, and system side zero-sequence current waveform 4 shakes
Swing the frequency of oscillation that frequency is less than the line side zero-sequence current waveform 4 of trouble point 6.
The difference of zero-sequence current waveform based on the failure side of trouble point 6 and line side, main website is obtained for suspected malfunctions area
The judgment basis of section：
（1）, amplitude criterion：Main website filters out the information that reports of within effective time all Intelligent power distribution terminals, searches each zero
The Intelligent power distribution terminal of sequence current signal amplitude maximum, on the basis of Intelligent power distribution terminal, zero-sequence current width is searched to its both sides
It is worth transition section, it is specified that when two neighboring transient zero-sequence current amplitude changes more than 50%, then the section is suspected malfunctions area
Section.
（2）, phase angle criterion：Main website filter out within effective time it is all can only Intelligent power distribution terminal report information, look into
The initial phase of each transient zero-sequence current signal is looked for, since the Intelligent power distribution terminal of transformer station's outlet switch 2, to line side
The section that zero-sequence current initial phase is overturn is searched, when the zero-sequence current initial phase difference △ β of two test points are in：150°
Then it is phase upset section, the section is suspected malfunctions section during 210 ° of ＜ △ β ＜.
（3）, frequency criterion：Main website filters out the information that reports of within effective time all Intelligent power distribution terminals, searches each
The frequency of individual transient zero-sequence current signal, since the Intelligent power distribution terminal of transformer station's outlet switch 2, zero sequence is searched to line side
Power frequency transition section, when two neighboring transient zero-sequence current frequency changes more than 50%, then judge the section for doubtful event
Hinder section.
Step 1009, criterion is weighted；
Each criterion in step 1008 is weighted for main website, wherein amplitude criterion, phase angle criterion and frequency criterion
Confidence coefficient be respectively 0.4,0.4 and 0.2.
Step 1010, whether confidence coefficient of the main station judging after step 1009 weighted calculation is more than 0.5, if greater than
0.5, step 1011 is performed, if less than equal to 0.5, performs step 1012.
Step 1011, fault section is determined；
Section of the confidence coefficient more than 0.5 after step 1009 weighted calculation is confirmed as fault section.
Step 1012, terminate；
Confidence coefficient after step 1009 weighted calculation is less than or equal to 0.5, and the section is non-faulting section, and fault section is sentenced
Terminate calmly.
Specific work process and operation principle are as follows：
Zero is set after Intelligent power distribution terminal small current ground fault detection function is started by Intelligent power distribution terminal first
The startup threshold value of sequence jump-value of current.After being broken down in circuit, zero-sequence current can undergo mutation, Intelligent power distribution terminal
To the zero-sequence current sampled signal that sampling obtains compared with startup threshold value set in advance, in continuous 1/8 power frequency
In cycle, the amplitude of zero-sequence current sampled signal exceedes startup threshold value and once remembers+1, once remembers -1 less than threshold value is started, according to
It is secondary cumulative, the accumulating values M finally given, if M>0, then it represents that Intelligent power distribution terminal starts, and doubtful generation is medium and small in circuit
Current earthing failure；If M≤0, Intelligent power distribution terminal does not start, and continues to sample transient current and counting before
Zero.
After Intelligent power distribution terminal starts, the Intelligent power distribution terminal record fault initiating time, transient zero-sequence current is carried out
The extraction of characteristic information, and the characteristic information extracted is uploaded to main website.Main website receives the temporary of Intelligent power distribution terminal upload
After the characteristic information of state zero-sequence current, data are grouped by main website according to transmission delay situation, and then main website combines
The characteristic information of transient zero-sequence current signal, judgement obtain suspected malfunctions section.
Main website is weighted according to the different criterions of suspected malfunctions section, if being weighted calculating after calculating
The confidence coefficient arrived is more than 0.5, then suspected malfunctions section is defined as into fault section；If the confidence coefficient being calculated is less than
Equal to 0.5, then suspected malfunctions are driven to non-faulting section, and the judgement of fault section terminates.
The above described is only a preferred embodiment of the present invention, being not the limitation for making other forms to the present invention, 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 it is every without departing from technical solution of the present invention content, the technical spirit according to the present invention is to above example institute
Any simple modification, equivalent variations and the remodeling made, still fall within the protection domain of technical solution of the present invention.
Claims (7)
1. the small current Earth design method based on transient zero-sequence current signal characteristic, is provided with substation bus bar（1）
With from substation bus bar（1）The a plurality of outlet of upper extraction（5）, in outlet（5）On upstream to downstream is provided with transformer station's outlet
Switch（2）Switched with multiple line sectionalizings（3）, in transformer station's outlet switch（2）Switched with line sectionalizing（3）Place is separately installed with
Intelligent power distribution terminal, all Intelligent power distribution terminals are connected with main website, it is characterised in that：Comprise the following steps：
Step a, start Intelligent power distribution terminal small current ground fault detection function；
Step b, the startup threshold value of zero-sequence current is set by Intelligent power distribution terminal；
Step c, Intelligent power distribution terminal according to the startup threshold value of setting compared with the sampled signal to zero-sequence current, according to
Whether entry condition judges that zero-sequence current starts and succeeds, if started successfully, performs step d, if not actuated success, returns to step
Rapid a；
Step d, after Intelligent power distribution terminal starts, the Intelligent power distribution terminal record fault initiating time；
Step e, Intelligent power distribution terminal carry out the extraction of characteristic information to transient zero-sequence current, and by the characteristic information extracted
Reach main website；
Step f, after main website receives the characteristic information of the transient zero-sequence current of Intelligent power distribution terminal upload, main website is according to channel
The transmission delay time is grouped to data；
Step g, the characteristic information of main website combination transient zero-sequence current signal, according to suspected malfunctions section judgment basis, judges
To suspected malfunctions section；
The suspected malfunctions section judgment basis in step g is weighted for step h, main website；
Whether step i, the confidence coefficient after step h weighted calculations are more than numerical upper limits, if greater than numerical upper limits, perform step
Rapid 1011, if less than equal to numerical upper limits, perform step 1012；
Step j, the section that the confidence coefficient after step h weighted calculations is more than numerical upper limits are confirmed as fault section；
Step k, the confidence coefficient after step h weighted calculations are less than or equal to numerical upper limits, and the section is non-faulting section, failure
The judgement of section terminates.
2. the small current Earth design method according to claim 1 based on transient zero-sequence current signal characteristic,
It is characterized in that：The entry condition of zero-sequence current described in step c is：The zero-sequence current that Intelligent power distribution terminal obtains to sampling
Sampled signal is compared with startup threshold value set in advance, in continuous 1/8 power frequency period, zero-sequence current sampling letter
Number amplitude exceed and start threshold value and once remember+1, once remember -1 less than threshold value is started, add up successively, what is finally given is cumulative
Numerical value M, if M>0, then it represents that Intelligent power distribution terminal starts, doubtful generation small current earth fault in circuit；If M≤0,
Then Intelligent power distribution terminal does not start, and continues to sample transient current and counting before is zeroed.
3. the small current Earth design method according to claim 1 based on transient zero-sequence current signal characteristic,
It is characterized in that：Characteristic information described in step e is：The latter power frequency period of small current earth fault occurs in circuit
It is interior, amplitude, phase angle and the frequency of transient zero-sequence current signal；Wherein amplitude and phase angle is calculated using Fourier algorithm, frequency
Rate is calculated using zero crossing calculating method.
4. the small current Earth design method according to claim 1 based on transient zero-sequence current signal characteristic,
It is characterized in that：Suspected malfunctions section judgment basis described in step g includes：
Amplitude criterion：What main website filtered out within effective time all Intelligent power distribution terminals reports information, searches each zero sequence electricity
The maximum Intelligent power distribution terminal of signal amplitude is flowed, on the basis of Intelligent power distribution terminal, zero-sequence current amplitude jump is searched to its both sides
Become section, when two neighboring transient zero-sequence current amplitude changes more than 50%, then the section is suspected malfunctions section；
Phase angle criterion：Main website filter out within effective time it is all can only Intelligent power distribution terminal report information, search it is each temporarily
The initial phase of state zero sequence current signal, from transformer station's outlet switch（2）Intelligent power distribution terminal start, to line side search zero
The section that sequence electric current initial phase is overturn, when the zero-sequence current initial phase difference △ β of two test points are in：150 ° of ＜ △ β
Then it is phase upset section, the section is suspected malfunctions section during 210 ° of ＜；
Frequency criterion：What main website filtered out within effective time all Intelligent power distribution terminals reports information, searches each transient state zero
The frequency of sequence current signal, from transformer station's outlet switch（2）Intelligent power distribution terminal start, to line side search zero-sequence current frequency
Rate transition section, when two neighboring transient zero-sequence current frequency changes more than 50%, then judge the section for suspected malfunctions area
Section.
5. the small current Earth design method according to claim 1 based on transient zero-sequence current signal characteristic,
It is characterized in that：Numerical upper limits described in step i are 0.5.
6. the small current Earth design method according to claim 4 based on transient zero-sequence current signal characteristic,
It is characterized in that：When suspected malfunctions section judgment basis is weighted step h, wherein amplitude criterion, phase angle criterion
And the confidence coefficient of frequency criterion is respectively 0.4,0.4 and 0.2.
7. the small current Earth design method according to claim 1 based on transient zero-sequence current signal characteristic,
It is characterized in that：For wire transmission mode, the span of the transmission delay time described in step f for 20ms ~
200ms；For wireless transmission method, the span of the transmission delay time described in step f is 1s ~ 5s.
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| CN115267408B (en) * | 2022-09-26 | 2023-01-20 | 华能辛店发电有限公司 | System and method for accurately positioning faults of power distribution switchgear based on artificial intelligence |
| CN115825655A (en) * | 2023-02-20 | 2023-03-21 | 国网山东省电力公司乳山市供电公司 | System and method for rapidly monitoring and positioning single-phase earth fault of distribution network |
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| CN117783765A (en) * | 2023-12-26 | 2024-03-29 | 科大智能电气技术有限公司 | Fault transient starting point searching method, medium and equipment for small-current grounding system |
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