CN107144762A - A kind of distribution net work earthing fault localization method based on Small Electric Current Earthing And Routing Device - Google Patents
A kind of distribution net work earthing fault localization method based on Small Electric Current Earthing And Routing Device Download PDFInfo
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- CN107144762A CN107144762A CN201710260346.9A CN201710260346A CN107144762A CN 107144762 A CN107144762 A CN 107144762A CN 201710260346 A CN201710260346 A CN 201710260346A CN 107144762 A CN107144762 A CN 107144762A
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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
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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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
The present invention relates to system for distribution network of power phase-to-ground fault detection technical field, and in particular to a kind of distribution net work earthing fault localization method based on Small Electric Current Earthing And Routing Device, specific steps include（1）The bus residual voltage and each bar circuit head end zero-sequence current of Small Electric Current Earthing And Routing Device collection fault moment；（2）The fault current peak signal and zero sequence current signal of fault detector collection fault moment；（3）Small Electric Current Earthing And Routing Device selects faulty line；（4）Small Electric Current Earthing And Routing Device collects the characteristic signal of the fault detector collection on faulty line；（5）Singlephase earth fault location determination；The present invention can be accurately positioned one-phase earthing failure in electric distribution network, Small Electric Current Earthing And Routing Device is theoretical using the route selection of transient signal feature band, and route selection rate of accuracy reached more than 98% can accurately catch transient signal, accident analysis can be achieved and traces to the source, while supporting load on-line measurement, statistics and analysis.
Description
Technical field
The present invention relates to system for distribution network of power phase-to-ground fault detection technical field, and in particular to one kind is based on small electricity
Flow the distribution net work earthing fault localization method of line-selected earthing device.
Background technology
With being continuously increased for need for electricity, the circuit of the power distribution network of 35kV and following voltage class is increasingly longer, branch
Circuit is more and more, and network structure becomes increasingly complex, and line failure rate is also higher, the core as influence power supply network reliability
Problem.It is of new generation small by representative of transient method principle although microcomputer protective relay device can detect and cut off short trouble
Current earthing line selection apparatus can detect and cut off earth fault, still, and faulty line can only be navigated at present, can not also be accurate
Fault point.
At present, localization of fault, which is substantially all, needs manual site to search, generally require to expend a large amount of human and material resources and when
Between, directly affect the reliable power supply ability and power supply quality of power distribution network.
The content of the invention
In order to solve the above problems, event is grounded the invention provides a kind of power distribution network based on Small Electric Current Earthing And Routing Device
Hinder localization method, concrete technical scheme is as follows：
A kind of distribution net work earthing fault localization method based on Small Electric Current Earthing And Routing Device comprises the following steps：
（1）The bus residual voltage and each bar circuit head end zero-sequence current of Small Electric Current Earthing And Routing Device collection fault moment；
（2）The fault current peak signal and zero sequence current signal of fault detector collection fault moment；
（3）Small Electric Current Earthing And Routing Device selects faulty line：
1）Each bar circuit zero sequence current temporary state high fdrequency component is calculated, note zero-sequence current amplitude is Val (i) (j), and phase is Phas
(i) (j), wherein i represent line number, i=1,2 ..., n；J represents frequency number of times, j=5 ..., 60, relatively more each each frequency of bar circuit
The corresponding zero-sequence current amplitude Val (i) (j) of rate number of times, finds maximum Max therein { Val (i) (j) }, and corresponding j values are
It is characterized frequency fs, the amplitude of the zero-sequence current of each bar circuit under characteristic frequency fs is characteristic component, remembers each bar circuit
Characteristic component amplitude is Val (i) (fs), and the phase value of characteristic component is Phas (i) (fs)；
2）By the characteristic component amplitude Val (i) (fs) of each bar circuit by sorting from big to small, and with first circuit L1 characteristic component
Phase value Phas (1) (fs) be reference, calculate the phase and first circuit L1 feature point of the characteristic component of other each bar circuits
The phase difference of the phase of amount, is designated as PH (i), i.e.,
PH(i)=Phas(i)(fs)-Phas(1)(fs)；
If, then judge corresponding i-th line road and the head same phases of circuit L1, remember the F of this circuit
(i)=1；If, then judge that corresponding i-th line road and first circuit L1 are anti-phase, remember the F of this circuit
(i)=-1；
3）In step 2）In all F (i) values of middle gained, and if only one circuit F (i) values and other circuits not
Together, it is Lx to remember this circuit, and its corresponding characteristic component amplitude Val (x) (fs) meets：
；
Circuit Lx is then judged as ground path, wherein k1 values are setting valve safety factor, span is 0.7 ~ 0.9；
4）Extract faulty line Lx zero-sequence current peak amplitude Ip_line, zero-sequence current fundamental voltage amplitude Val_line (1), zero sequence
The subharmonic amplitude Val_line (5) of electric current 5；
（4）Small Electric Current Earthing And Routing Device collects the characteristic signal of the fault detector collection on faulty line Lx：
Small Electric Current Earthing And Routing Device issues data calling instruction, faulty line to fault detector all on faulty line Lx
Fault detector on Lx is received after the data calling instruction that Small Electric Current Earthing And Routing Device is issued, from step（2）Middle collection
Fault current peak signal I is extracted in semaphorep_fi(s), the fundamental voltage amplitude Val_fi (s) (1) and zero sequence of zero sequence current signal
Fundamental phase Pha_fi (s) (1), the subharmonic amplitude Val_fi (s) of zero-sequence current 5 (5) of current signal and zero-sequence current 5 times are humorous
Wave phase Pha_fi (s) (5), s are the numbering of the fault detector on faulty line Lx, are compiled successively from circuit head end to end
Number, s=1,2,3 ... m, m is the sum for the fault detector installed on faulty line Lx；
（5）Singlephase earth fault location determination：
1）Criterion 1：
；
Criterion 1 is applied to isolated neutral system and arc suppression coil earthing system；Wherein Ip_lineFor faulty line Lx zero sequence
Current peak amplitude, Ip_lineFor two sub-values after the ZCT progress of disease, Krel1For safety factor, span is 0.9
~ 1.2, KctZero sequence current mutual inductor no-load voltage ratio is obtained for faulty line Lx, is adjusted by the actual ratio that becomes, Ip_fi(1) it is faulty line Lx
The maximum for the fault current peak signal amplitude that upper first group of fault detector close to bus is gathered, Ip_fi(1) for once
Value；
2）Criterion 2：
；
Criterion 2 is applied to isolated neutral system；Wherein Val_fi (1) (1) is first close to bus on faulty line Lx
The fundamental voltage amplitude of the zero sequence current signal of group fault detector collection, is a sub-value, Krel2For safety factor, span is
0.9 ~ 1.2, KctZero sequence current mutual inductor no-load voltage ratio is obtained for faulty line Lx, is adjusted by the actual ratio that becomes, Val_line (1) is failure
Circuit Lx zero-sequence current fundamental voltage amplitude；
3）Criterion 3：
；
Criterion 3 is applied to isolated neutral system and arc suppression coil earthing system, and Val_fi (1) (5) is on faulty line Lx
The subharmonic amplitude of zero-sequence current 5 gathered close to first group of fault detector of bus, is a sub-value；Krel3For safety factor,
Span is 0.9 ~ 1.2, KctZero sequence current mutual inductor no-load voltage ratio is obtained for faulty line Lx, is adjusted by the actual ratio that becomes, Val_
Line (5) is the faulty line Lx subharmonic amplitude of zero-sequence current 5；
4）For isolated neutral system, if meeting the condition of criterion 1, and criterion 2 or criterion 3 are met, then it is assumed that failure
Trouble point on circuit Lx is located at after first group of fault detector on faulty line Lx, continues executing with consequent malfunction point and determines
Position；Otherwise it is assumed that the trouble point on faulty line Lx is located at before the upper first group of fault detector of faulty line Lx；
For arc suppression coil earthing system, if meeting the condition of criterion 1 and criterion 3 simultaneously, then it is assumed that on faulty line Lx
Trouble point is located at after first group of fault detector on faulty line Lx, continues executing with consequent malfunction point location；Otherwise it is assumed that
Trouble point on faulty line Lx is located at before first group of fault detector on faulty line Lx；
5）Criterion 4：
；
Criterion 4 is applied to isolated neutral system, wherein,For all indicating fault on faulty line Lx
Maximum in the zero-sequence current fundamental voltage amplitude of device collection, corresponding fault detector group number is p,For event
Hinder the corresponding phase of maximum in the zero-sequence current fundamental voltage amplitude of all fault detector collections on circuit Lx；、For one group of failure on faulty line Lx behind pth group fault detector
The amplitude and corresponding phase of the zero-sequence current fundamental wave of indicator collection；Kset1For the safety factor adjusted, span is 2 ~
5；Calculation formula it is as follows：
；
Wherein m is the sum for the fault detector installed on faulty line Lx；
6）Criterion 5：
；
Criterion 5 is applied to isolated neutral system and arc suppression coil earthing system, wherein,For fault wire
Maximum on the Lx of road in the subharmonic amplitude of zero-sequence current 5 of all fault detector collections, corresponding fault detector group number
For q,For in the subharmonic amplitude of zero-sequence current 5 of all fault detector collections on faulty line Lx
The corresponding phase of maximum；、Refer to for the upper q group failures of faulty line Lx
Show the amplitude and its corresponding phase for the subharmonic of zero-sequence current 5 that one group of fault detector behind device is gathered；Kset2Adjust
Safety factor, span is 2 ~ 5；Calculation formula it is as follows：
；
Wherein m is the sum for the fault detector installed on faulty line Lx；
7）For isolated neutral system, if meeting the condition of criterion 4 or the condition of criterion 5, then it is assumed that faulty line
Trouble point on Lx is located on faulty line Lx after pth group fault detector；If p ≠ q, then it is assumed that on faulty line Lx
Trouble point is located at after the upper q group fault detectors of faulty line Lx；If criterion 4, criterion 5 are all unsatisfactory for condition, it is judged to
Fault location fails；
For arc suppression coil earthing system, in order to avoid arc suppression coil compensation electric current influences, only with the failure judgement circuit of criterion 5
The upper position of failure point of Lx, if meeting the condition of criterion 5, then it is assumed that the trouble point on faulty line Lx is located on faulty line Lx
After q group fault detectors, fault location failure is otherwise judged.
Further, step（1）In sampling rate be not less than 25.6kHz.
Further, step（2）Described in fault detector be oppositely arranged 3 in different unilines every 1 ~ 2km；Not
It is one group of fault detector with 3 fault detectors that uniline is oppositely arranged；It is single that the fault detector includes 3 collections
Member, 1 collect unit, 3 collecting units collect unit with 1 respectively and are connected；The fault current peak signal is by total current
Signal is collected after low-frequency cut-off frequency is 150Hz high-pass filtering circuit；Zero sequence current signal is by fault detector
3 collecting units collection phase current signal through collecting unit synthesis obtain.
Further, step（3）Middle characteristic component, which is extracted, uses data window method, with step（1）In each bar circuit head end zero sequence
A cycle data are taken centered on the corresponding moment T that maximum in current sampling data occurs, Fourier is carried out to the data window
Calculate, obtain each frequency number of times of this circuit zero-sequence current amplitude Val (i) (j) and and its phase Phas (i) (j), find
The maximum amplitude Max { Val (i) (j) } of zero-sequence current therein, its corresponding frequency j is characteristic frequency fs.
Further, step（4）Small current line-selected earthing device is on faulty line Lx by GPRS communication mode
All fault detectors issue data calling instruction.
A kind of distribution net work earthing fault localization method based on Small Electric Current Earthing And Routing Device proposed by the present invention, it is comprehensive temporary
State principle Small Electric Current Earthing And Routing Device and the information of fault detector collection on circuit, can be achieved one-phase earthing failure in electric distribution network
It is accurately positioned, is conducive to field failure to search, improve Distribution Network Failure treatment effeciency, less power off time, lifting power distribution network is powered
Reliability.The present invention can be accurately positioned one-phase earthing failure in electric distribution network, and Small Electric Current Earthing And Routing Device is special using transient signal
Levy frequency band route selection theoretical, route selection rate of accuracy reached more than 98% can accurately catch transient signal, accident analysis can be achieved and traces to the source, together
When support load on-line measurement, statistics and analysis.
Brief description of the drawings
Fig. 1 is a kind of flow of the distribution net work earthing fault localization method based on Small Electric Current Earthing And Routing Device of the present invention
Figure.
Embodiment
In order to be better understood from the present invention, the invention will be further described with specific embodiment below in conjunction with the accompanying drawings：
Research is found：（1）In isolated neutral system, on fault wire, from bus to fault point, closer to trouble point, respectively
Locate zero-sequence current bigger；（2）In isolated neutral system, on fault wire, from trouble point to line end, closer to failure
Point, zero-sequence current is bigger everywhere；（3）In isolated neutral system, circuit head end zero-sequence current is less than trouble point upstream failure
Indicator gathers the zero-sequence current of zero-sequence current, noticeably greater than trouble point downstream；（4）In isolated neutral system, trouble point
The zero-sequence current phase of upstream and the zero-sequence current opposite in phase of trouble point downstream；（5）In arc suppression coil earthing system, trouble point
The zero-sequence current of upstream is all influenceed by arc suppression coil compensation electric current,（1）、（3）、（4）The conclusion may no longer be met；
（6）In arc suppression coil earthing system, the zero-sequence current feature of trouble point downstream still with conclusion（2）Unanimously；（7）Arc suppression coil connects
In ground system, the transient state component in first capacitive frequency range is not influenceed by arc suppression coil substantially, conclusion（1）Extremely（4）Still set up.According to
These features, the invention provides a kind of distribution net work earthing fault localization method based on Small Electric Current Earthing And Routing Device, specifically
Technical scheme is as follows：
A kind of distribution net work earthing fault localization method based on Small Electric Current Earthing And Routing Device comprises the following steps：
（1）The bus residual voltage and each bar circuit head end zero-sequence current of Small Electric Current Earthing And Routing Device collection fault moment, are adopted
Sample speed is not less than 25.6kHz, to ensure to catch ground connection moment zero-sequence current transient signal without distortion；
（2）The fault current peak signal and zero sequence current signal of fault detector collection fault moment；Fault detector is every 1
~ 2km is oppositely arranged 3 in different unilines；3 fault detectors being oppositely arranged in different unilines are one group of failure
Indicator；Fault detector collects unit including 3 collecting units, 1, and 3 collecting units collect unit company with 1 respectively
Connect；Fault current peak signal is gathered by full current signal after low-frequency cut-off frequency is 150Hz high-pass filtering circuit
Arrive, effectively filter out 50Hz load current signal；The phase electricity that zero sequence current signal is gathered by 3 collecting units of fault detector
Stream signal is obtained by collecting unit synthesis.
（3）Small Electric Current Earthing And Routing Device selects faulty line：
1）Each bar circuit zero sequence current temporary state high fdrequency component is calculated, note zero-sequence current amplitude is Val (i) (j), and phase is Phas
(i) (j), wherein i represent line number, i=1,2 ..., n；J represents frequency number of times, j=5 ..., 60, relatively more each each frequency of bar circuit
The corresponding zero-sequence current amplitude Val (i) (j) of rate number of times, finds maximum Max therein { Val (i) (j) }, and corresponding j values are
It is characterized frequency fs, the amplitude of the zero-sequence current of each bar circuit under characteristic frequency fs is characteristic component, remembers each bar circuit
Characteristic component amplitude is Val (i) (fs), and the phase value of characteristic component is Phas (i) (fs)；
2）By the characteristic component amplitude Val (i) (fs) of each bar circuit by sorting from big to small, and with and with first circuit L1 feature
The phase value Phas (1) (fs) of component is reference, calculates phase and the first circuit L1 spy of the characteristic component of other each bar circuits
The phase difference of the phase of component is levied, PH (i) is designated as, i.e.,
PH(i)=Phas(i)(fs)-Phas(1)(fs)；
If, then judge corresponding i-th line road and the head same phases of circuit L1, remember the F of this circuit
(i)=1；If, then judge that corresponding i-th line road and first circuit L1 are anti-phase, remember the F of this circuit
(i)=-1；
3）In step 2）In all F (i) values of middle gained, and if only one circuit F (i) values and other circuits not
Together, it is Lx to remember this circuit, and its corresponding characteristic component amplitude Val (x) (fs) meets：
；
Circuit Lx is then judged as ground path, wherein k1 values are setting valve safety factor, span is 0.7 ~ 0.9；
4）Extract faulty line Lx zero-sequence current peak amplitude Ip_line, zero-sequence current fundamental voltage amplitude Val_line (1), zero sequence
The subharmonic amplitude Val_line (5) of electric current 5；
（4）Small Electric Current Earthing And Routing Device collects the characteristic signal of the fault detector collection on faulty line Lx：
Small Electric Current Earthing And Routing Device issues number by GPRS communication mode to fault detector all on faulty line Lx
According to calling instruction, the fault detector on faulty line Lx receives the data calling instruction that Small Electric Current Earthing And Routing Device is issued
Afterwards, from step（2）Fault current peak signal I is extracted in the semaphore of middle collectionp_fi(s), the fundamental wave width of zero sequence current signal
Fundamental phase Pha_fi (s) (1), the subharmonic amplitude Val_fi of zero-sequence current 5 of value Val_fi (s) (1) and zero sequence current signal
(s) (5) and the numbering that the subharmonic phase Pha_fi (s) of zero-sequence current 5 (5), s are the fault detector on faulty line Lx, from
Circuit head end is to end number consecutively, s=1,2,3 ... m, and m is the sum for the fault detector installed on faulty line Lx；
（5）Singlephase earth fault location determination：
1）Criterion 1：
；
Criterion 1 is applied to isolated neutral system and arc suppression coil earthing system；Wherein Ip_lineFor faulty line Lx zero sequence
Current peak amplitude, Ip_lineFor two sub-values after the ZCT progress of disease, Krel1For safety factor, span is 0.9
~ 1.2, KctZero sequence current mutual inductor no-load voltage ratio is obtained for faulty line Lx, is adjusted by the actual ratio that becomes, Ip_fi(1) it is faulty line Lx
The maximum for the fault current peak signal amplitude that upper first group of fault detector close to bus is gathered, Ip_fi(1) for once
Value；
2）Criterion 2：
；
Criterion 2 is applied to isolated neutral system；Wherein Val_fi (1) (1) is first close to bus on faulty line Lx
The fundamental voltage amplitude of the zero sequence current signal of group fault detector collection, is a sub-value, Krel2For safety factor, span is
0.9 ~ 1.2, KctZero sequence current mutual inductor no-load voltage ratio is obtained for faulty line Lx, is adjusted by the actual ratio that becomes, Val_line (1) is failure
Circuit Lx zero-sequence current fundamental voltage amplitude；
3）Criterion 3：
；
Criterion 3 is applied to isolated neutral system and arc suppression coil earthing system, and Val_fi (1) (5) is on faulty line Lx
The subharmonic amplitude of zero-sequence current 5 gathered close to first group of fault detector of bus, is a sub-value；Krel3For safety factor,
Span is 0.9 ~ 1.2, KctZero sequence current mutual inductor no-load voltage ratio is obtained for faulty line Lx, is adjusted by the actual ratio that becomes, Val_
Line (5) is the faulty line Lx subharmonic amplitude of zero-sequence current 5；
4）For isolated neutral system, if meeting the condition of criterion 1, and criterion 2 or criterion 3 are met, then it is assumed that failure
Trouble point on circuit Lx is located at after first group of fault detector on faulty line Lx, continues executing with consequent malfunction point and determines
Position；Otherwise it is assumed that the trouble point on faulty line Lx is located at before the upper first group of fault detector of faulty line Lx；
For arc suppression coil earthing system, if meeting the condition of criterion 1 and criterion 3 simultaneously, then it is assumed that on faulty line Lx
Trouble point is located at after first group of fault detector on faulty line Lx, continues executing with consequent malfunction point location；Otherwise it is assumed that
Trouble point on faulty line Lx is located at before first group of fault detector on faulty line Lx；
5）Criterion 4：
；
Criterion 4 is applied to isolated neutral system, wherein,For all indicating fault on faulty line Lx
Maximum in the zero-sequence current fundamental voltage amplitude of device collection, corresponding fault detector group number is p,For event
Hinder the corresponding phase of maximum in the zero-sequence current fundamental voltage amplitude of all fault detector collections on circuit Lx；、For one group of failure on faulty line Lx behind pth group fault detector
The amplitude and corresponding phase of the zero-sequence current fundamental wave of indicator collection；Kset1For the safety factor adjusted, span is 2 ~
5；Calculation formula it is as follows：
；
Wherein m is the sum for the fault detector installed on faulty line Lx；
6）Criterion 5：
；
Criterion 5 is applied to isolated neutral system and arc suppression coil earthing system, wherein,For fault wire
Maximum on the Lx of road in the subharmonic amplitude of zero-sequence current 5 of all fault detector collections, corresponding fault detector group number
For q,For in the subharmonic amplitude of zero-sequence current 5 of all fault detector collections on faulty line Lx
The corresponding phase of maximum；、Refer to for the upper q group failures of faulty line Lx
Show the amplitude and its corresponding phase for the subharmonic of zero-sequence current 5 that one group of fault detector behind device is gathered；Kset2Adjust
Safety factor, span is 2 ~ 5；Calculation formula it is as follows：
；
Wherein m is the sum for the fault detector installed on faulty line Lx；
7）For isolated neutral system, if meeting the condition of criterion 4 or the condition of criterion 5, then it is assumed that faulty line
Trouble point on Lx is located on faulty line Lx after pth group fault detector；If p ≠ q, then it is assumed that on faulty line Lx
Trouble point is located at after the upper q group fault detectors of faulty line Lx；If criterion 4, criterion 5 are all unsatisfactory for condition, it is judged to
Fault location fails；
For arc suppression coil earthing system, in order to avoid arc suppression coil compensation electric current influences, only with the failure judgement circuit of criterion 5
The upper position of failure point of Lx, if meeting the condition of criterion 5, then it is assumed that the trouble point on faulty line Lx is located on faulty line Lx
After q group fault detectors, fault location failure is otherwise judged.
Further, step（3）Middle characteristic component, which is extracted, uses data window method, with step（1）In each bar circuit head end zero sequence
A cycle data are taken centered on the corresponding moment T that maximum in current sampling data occurs, Fourier is carried out to the data window
Calculate, obtain each frequency number of times of this circuit zero-sequence current amplitude Val (i) (j) and and its phase Phas (i) (j), find
The maximum amplitude Max { Val (i) (j) } of zero-sequence current therein, its corresponding frequency j is characteristic frequency fs.
The present invention is not limited to above-described embodiment, the foregoing is only the preferable case study on implementation of the present invention
, it is not intended to limit the invention, any modification for being made within the spirit and principles of the invention, equivalent substitution and changes
Enter, should be included in the scope of the protection.
Claims (5)
1. a kind of distribution net work earthing fault localization method based on Small Electric Current Earthing And Routing Device, it is characterised in that：Including following
Step：
（1）The bus residual voltage and each bar circuit head end zero-sequence current of Small Electric Current Earthing And Routing Device collection fault moment；
（2）The fault current peak signal and zero sequence current signal of fault detector collection fault moment；
（3）Small Electric Current Earthing And Routing Device selects faulty line：
1）Each bar circuit zero sequence current temporary state high fdrequency component is calculated, note zero-sequence current amplitude is Val (i) (j), and phase is Phas
(i) (j), wherein i represent line number, i=1,2 ..., n；J represents frequency number of times, j=5 ..., 60, relatively more each each frequency of bar circuit
The corresponding zero-sequence current amplitude Val (i) (j) of rate number of times, finds maximum Max therein { Val (i) (j) }, and corresponding j values are
It is characterized frequency fs, the amplitude of the zero-sequence current of each bar circuit under characteristic frequency fs is characteristic component, remembers each bar circuit
Characteristic component amplitude is Val (i) (fs), and the phase value of characteristic component is Phas (i) (fs)；
2）By the characteristic component amplitude Val (i) (fs) of each bar circuit by sorting from big to small, and with first circuit L1 characteristic component
Phase value Phas (1) (fs) be reference, calculate the phase and first circuit L1 feature point of the characteristic component of other each bar circuits
The phase difference of the phase of amount, is designated as PH (i), i.e.,
PH(i)=Phas(i)(fs)-Phas(1)(fs)；
If, then judge corresponding i-th line road and the head same phases of circuit L1, remember the F (i) of this circuit
=1；If, then judge that corresponding i-th line road and first circuit L1 are anti-phase, remember the F (i) of this circuit
=-1；
3）In step 2）In all F (i) values of middle gained, and if only one circuit F (i) values and other circuits not
Together, it is Lx to remember this circuit, and its corresponding characteristic component amplitude Val (x) (fs) meets：
；
Circuit Lx is then judged as ground path, wherein k1 values are setting valve safety factor, span is 0.7 ~ 0.9；
4）Extract faulty line Lx zero-sequence current peak amplitude Ip_line, zero-sequence current fundamental voltage amplitude Val_line (1), zero sequence
The subharmonic amplitude Val_line (5) of electric current 5；
（4）Small Electric Current Earthing And Routing Device collects the characteristic signal of the fault detector collection on faulty line Lx：
Small Electric Current Earthing And Routing Device issues data calling instruction, faulty line to fault detector all on faulty line Lx
Fault detector on Lx is received after the data calling instruction that Small Electric Current Earthing And Routing Device is issued, from step（2）Middle collection
Fault current peak signal I is extracted in semaphorep_fi(s), the fundamental voltage amplitude Val_fi (s) (1) and zero sequence of zero sequence current signal
Fundamental phase Pha_fi (s) (1), the subharmonic amplitude Val_fi (s) of zero-sequence current 5 (5) of current signal and zero-sequence current 5 times are humorous
Wave phase Pha_fi (s) (5), s are the numbering of the fault detector on faulty line Lx, are compiled successively from circuit head end to end
Number, s=1,2,3 ... m, m is the sum for the fault detector installed on faulty line Lx；
（5）Singlephase earth fault location determination：
1）Criterion 1：
；
Criterion 1 is applied to isolated neutral system and arc suppression coil earthing system；Wherein Ip_lineFor faulty line Lx zero sequence
Current peak amplitude, Ip_lineFor two sub-values after the ZCT progress of disease, Krel1For safety factor, span is 0.9
~ 1.2, KctZero sequence current mutual inductor no-load voltage ratio is obtained for faulty line Lx, is adjusted by the actual ratio that becomes, Ip_fi(1) it is faulty line Lx
The maximum for the fault current peak signal amplitude that upper first group of fault detector close to bus is gathered, Ip_fi(1) for once
Value；
2）Criterion 2：
；
Criterion 2 is applied to isolated neutral system；Wherein Val_fi (1) (1) is first close to bus on faulty line Lx
The fundamental voltage amplitude of the zero sequence current signal of group fault detector collection, is a sub-value, Krel2For safety factor, span is
0.9 ~ 1.2, KctZero sequence current mutual inductor no-load voltage ratio is obtained for faulty line Lx, is adjusted by the actual ratio that becomes, Val_line (1) is failure
Circuit Lx zero-sequence current fundamental voltage amplitude；
3）Criterion 3：
；
Criterion 3 is applied to isolated neutral system and arc suppression coil earthing system, and Val_fi (1) (5) is on faulty line Lx
The subharmonic amplitude of zero-sequence current 5 gathered close to first group of fault detector of bus, is a sub-value；Krel3For safety factor,
Span is 0.9 ~ 1.2, KctZero sequence current mutual inductor no-load voltage ratio is obtained for faulty line Lx, is adjusted by the actual ratio that becomes, Val_
Line (5) is the faulty line Lx subharmonic amplitude of zero-sequence current 5；
4）For isolated neutral system, if meeting the condition of criterion 1, and criterion 2 or criterion 3 are met, then it is assumed that failure
Trouble point on circuit Lx is located at after first group of fault detector on faulty line Lx, continues executing with consequent malfunction point and determines
Position；Otherwise it is assumed that the trouble point on faulty line Lx is located at before the upper first group of fault detector of faulty line Lx；
For arc suppression coil earthing system, if meeting the condition of criterion 1 and criterion 3 simultaneously, then it is assumed that on faulty line Lx
Trouble point is located at after first group of fault detector on faulty line Lx, continues executing with consequent malfunction point location；Otherwise it is assumed that
Trouble point on faulty line Lx is located at before first group of fault detector on faulty line Lx；
5）Criterion 4：
；
Criterion 4 is applied to isolated neutral system, wherein,For all indicating fault on faulty line Lx
Maximum in the zero-sequence current fundamental voltage amplitude of device collection, corresponding fault detector group number is p,For event
Hinder the corresponding phase of maximum in the zero-sequence current fundamental voltage amplitude of all fault detector collections on circuit Lx；、For one group of failure on faulty line Lx behind pth group fault detector
The amplitude and corresponding phase of the zero-sequence current fundamental wave of indicator collection；Kset1For the safety factor adjusted, span is 2 ~
5；Calculation formula it is as follows：
；
Wherein m is the sum for the fault detector installed on faulty line Lx；
6）Criterion 5：
；
Criterion 5 is applied to isolated neutral system and arc suppression coil earthing system, wherein,For fault wire
Maximum on the Lx of road in the subharmonic amplitude of zero-sequence current 5 of all fault detector collections, corresponding fault detector group number
For q,For in the subharmonic amplitude of zero-sequence current 5 of all fault detector collections on faulty line Lx
The corresponding phase of maximum；、Refer to for the upper q group failures of faulty line Lx
Show the amplitude and its corresponding phase for the subharmonic of zero-sequence current 5 that one group of fault detector behind device is gathered；Kset2Adjust
Safety factor, span is 2 ~ 5；Calculation formula it is as follows：
；
Wherein m is the sum for the fault detector installed on faulty line Lx；
7）For isolated neutral system, if meeting the condition of criterion 4 or the condition of criterion 5, then it is assumed that faulty line
Trouble point on Lx is located on faulty line Lx after pth group fault detector；If p ≠ q, then it is assumed that on faulty line Lx
Trouble point is located at after the upper q group fault detectors of faulty line Lx；If criterion 4, criterion 5 are all unsatisfactory for condition, it is judged to
Fault location fails；
For arc suppression coil earthing system, in order to avoid arc suppression coil compensation electric current influences, only with the failure judgement circuit of criterion 5
The upper position of failure point of Lx, if meeting the condition of criterion 5, then it is assumed that the trouble point on faulty line Lx is located on faulty line Lx
After q group fault detectors, fault location failure is otherwise judged.
2. a kind of distribution net work earthing fault localization method based on Small Electric Current Earthing And Routing Device according to claim 1,
It is characterized in that：Step（1）In sampling rate be not less than 25.6kHz.
3. a kind of distribution net work earthing fault localization method based on Small Electric Current Earthing And Routing Device according to claim 1,
It is characterized in that：Step（2）Described in fault detector be oppositely arranged 3 in different unilines every 1 ~ 2km；In different lists
3 fault detectors that phase line is oppositely arranged are one group of fault detector；The fault detector includes 3 collecting units, 1
Individual to collect unit, 3 collecting units collect unit with 1 respectively and are connected；The fault current peak signal is by full current signal
Collected after low-frequency cut-off frequency is 150Hz high-pass filtering circuit；Zero sequence current signal is by 3 of fault detector
The phase current signal of collecting unit collection is obtained by collecting unit synthesis.
4. a kind of distribution net work earthing fault localization method based on Small Electric Current Earthing And Routing Device according to claim 1,
It is characterized in that：Step（3）Middle characteristic component, which is extracted, uses data window method, with step（1）In each bar circuit head end zero-sequence current
A cycle data are taken centered on the corresponding moment T that maximum in sampled value occurs, Fourier's calculating is carried out to the data window,
Obtain each frequency number of times of this circuit zero-sequence current amplitude Val (i) (j) and and its phase Phas (i) (j), find wherein
Zero-sequence current maximum amplitude Max { Val (i) (j) }, its corresponding frequency j is characteristic frequency fs.
5. a kind of distribution net work earthing fault localization method based on Small Electric Current Earthing And Routing Device according to claim 1,
It is characterized in that：Step（4）Small current line-selected earthing device is that own by GPRS communication mode on faulty line Lx
Fault detector issue data calling instruction.
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