CN103675605A  Smallcurrent earth fault line selection method based on fault signal transient state correlation analysis  Google Patents
Smallcurrent earth fault line selection method based on fault signal transient state correlation analysis Download PDFInfo
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 CN103675605A CN103675605A CN201310672204.5A CN201310672204A CN103675605A CN 103675605 A CN103675605 A CN 103675605A CN 201310672204 A CN201310672204 A CN 201310672204A CN 103675605 A CN103675605 A CN 103675605A
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Abstract
The invention relates to a smallcurrent earth fault line selection method based on fault signal transient state correlation analysis, and belongs to the technical field of power distribution network automation. The technical problems in power distribution network singlephase earth fault line selection are solved. The smallcurrent earth fault line selection method is characterized in that a feeder threephase current is led in, the twophase current difference of each feeder is obtained, correlation analysis is carried out on a feeder zerosequence current and respective twophase current differences, and a comprehensive correlation coefficient matrix E is formed; rhomax and rhomin in the E are selected, and if rhomaxrhomin>=rhoset, it is judged that the system has a singlephase earth fault, and fault lines are the feeders corresponding to rhomax; if rhomaxrhomin< rhoset, it is judged that the singlephase earth fault happens at the position of a busbar. The smallcurrent earth fault line selection method is suitable for 35kV and 10kV voltageclass neutralpoint noneffectiveness earthed linecable mixed power distribution networks. The smallcurrent earth fault line selection method has the advantages of being good in instantaneity, high in adaptability and high in accuracy rate, and the project practical value is achieved.
Description
Technical field
The invention belongs to electrical technology field, relate to a kind of lowcurrent ground fault line selection method based on the correlation analysis of faultsignal transient state.
Background technology
Domestic medium voltage distribution network is most of adopts small current neutral grounding, isolated neutral, through high resistance ground or through grounding through arc.When there is singlephase earth fault, fault current is less, and electric arc is also unstable, and the various failure line selection technology based on steadystate quantity are undesirable actual Use Limitation fruit.While there is singlephase earth fault, have an obvious transient state process, when transient state earthing capacitance current is often than its stable state at short notice large several times to tens times, this process comprises abundant fault signature, for failure line selection provides advantage.
The method of traditional small current earthing wireselecting that utilizes correlation analysis has: the correlativity of the zerosequence current between each outlet in oneperiod after occurring by fault relatively, forms correlation matrix, and define coefficient of colligation and select faulty line; Or utilize the failure line selection correlation analysis method of WAVELET PACKET DECOMPOSITION, after adopting suitable band width to singlephase earth fault, the zerosequence current of each outlet carries out wavelet decomposition, and select characteristic spectra by the principle of energy maximum, according to faulty line with perfect the most weak principle of circuit similarity in characteristic spectra, by the WAVELET PACKET DECOMPOSITION coefficient to characteristic spectra, carry out correlation analysis and realize failure line selection.Abovementioned correlativity route selection is all the correlation analysis based between each feeder line zerosequence current.When mixing by cable and overhead transmission line the feeder line generation singlephase earth fault forming, joint line easily produces vibration, when it is directly carried out to correlation analysis with the zerosequence current that does not produce the circuit of vibration, just easily causes route selection inaccurate; In the power distribution network of neutral by arc extinction coil grounding, the compensation of inductance current can affect amplitude and the phase place of faulty line zerosequence current, makes traditional correlation analysis may occur route selection mistake.
In power distribution network for the power distribution network containing mixing feeder line and employing grounding through arc, the problem of failure line selection difficulty, the selection method that the present invention proposes, not between each feeder current, but between the composite signal by every threephase current of feeder line own, carry out correlation analysis, avoid the deficiency of classic method, guaranteed the accuracy of route selection.
Summary of the invention
The present invention proposes a kind of lowcurrent ground fault line selection method based on the correlation analysis of faultsignal transient state.
Technical solution of the present invention is as follows: a kind of lowcurrent ground fault line selection method based on the correlation analysis of faultsignal transient state, comprises following step:
Step 1: with sample frequency 8000Hz, the residual voltage of power distribution network bus is carried out to realtime sampling, if continuous three sampled value u of residual voltage
_{0}(n), u
_{0}(n+1), u
_{0}(n+2) be all greater than 0.15 times of bus rated voltage, judge on this bus or this bus and have feeder line that singlephase earth fault has occurred; Otherwise, judge that power distribution network is in normal operating condition, continue sampling and monitor residual voltage sampled value;
Step 2: singlephase earth fault has occurred power distribution network if judge, with sample frequency 8000Hz sampling record trouble, there is threephase current and the zerosequence current of all feeder lines on the interior bus threephase voltage of a rear power frequency period (20 milliseconds) and bus, obtain respectively corresponding sampled value sequence u
_{a}(n), u
_{b}(n), u
_{c}(n), i
_{a.k}(n), i
_{b.k}(n), i
_{c.k}(n), i
_{0.k}(n), n=1,2,3 ..., N, k=1,2,3 ... M; N is sampled point sequence number, and N=160 is a sampling number in power frequency period, and k is each feeder line sequence number, and M is the number of feeder line on bus;
Step 3: the effective value U that calculates as follows bus threephase voltage after fault
_{a}, U
_{b}, U
_{c}:
Step 4: compare bus threephase voltage U
_{a}, U
_{b}, U
_{c}size, get minimum voltage value corresponding mutually for fault phase;
Step 5: the zerosequence current of each feeder line collecting and threephase current are carried out to digital notch processing, and elimination is 50Hz power frequency component wherein;
Step 6: according to the selected fault phase of step 4, calculate the poor and related coefficient of the biphase current of each feeder line:
If fault phase is A phase, ask for i
_{aB.k}(n)=i
_{a.k}(n)i
_{b.k}and i (n)
_{aC.k}(n)=i
_{a.k}(n)i
_{c.k}(n), and respectively calculate the poor i of biphase current
_{aB.k}(n), i
_{aC.k}(n) with corresponding feeder line zerosequence current i
_{0.k}(n) dependency number:
If fault phase is B phase, ask for i
_{bA.k}(n)=i
_{b.k}(n)i
_{a.k}and i (n)
_{bC.k}(n)=i
_{b.k}(n)i
_{c.k}(n), and respectively calculate the poor i of biphase current
_{bA.k}(n), i
_{bC.k}(n) with corresponding feeder line zerosequence current i
_{0.k}(n) related coefficient:
If fault phase is C phase, ask for i
_{cA.k}(n)=i
_{c.k}(n)i
_{a.k}and i (n)
_{cB.k}(n)=i
_{c.k}(n)i
_{b.k}(n), and respectively calculate the poor i of biphase current
_{cA.k}(n), i
_{cB.k}(n) with corresponding feeder line zerosequence current i
_{0.k}(n) related coefficient:
Wherein, k=1,2,3 ... M;
Step 7: the integrated correlation coefficient that calculates each feeder line
k=1,2,3 ... M, forms integrated correlation coefficient matrix E=[ρ (1), ρ (2) ..., ρ (M)];
Step 8: the correlation coefficient threshold ρ of setting
_{set}=0.5, the integrated correlation coefficient of each feeder line that comparison step 7 obtains, finds maximal value ρ wherein
_{max}with minimum value ρ
_{min}, and compare ρ
_{max}ρ
_{min}with ρ
_{set}size, if meet ρ
_{max}ρ
_{min}>=ρ
_{set}, in decisionmaking system, singlephase earth fault has occurred, and faulty line is integrated correlation coefficient ρ
_{max}corresponding feeder line; If meet ρ
_{max}ρ
_{min}< ρ
_{set}, be judged to be bus place singlephase earth fault occurred.
The present invention has following beneficial effect:
The present invention propose selection method there is following characteristics:
1) strong adaptability.Problem for cable joint line and arc suppression coil earthing system failure line selection difficulty, corresponding innovative approach has been proposed: the threephase current of introducing feeder line, the biphase current that obtains fault phase and healthy phases is poor, the zerosequence current of itself and circuit self is carried out to correlation analysis, can eliminate the impact that impact between the circuit that joint line brings and arc suppression coil bring to faulty line zerosequence current.
2) route selection accuracy rate is high.Selection method is can be in different fault types (line fault, busbar fault, electric arc fault), and different stake resistances, can both correctly select faulty line when different fault close angles and fault distance;
3) antijamming capability is strong.The selection method that the present invention proposes utilizes that the biphase current of same feeder line is poor carries out correlation analysis with zerosequence current, can eliminate well the noise in sampled signal;
4) realtime.The data of oneperiod (20 milliseconds) after the selection method that the present invention proposes only need to utilize fault to occur, and select that algorithm is simple, calculated amount is little, can in the time very short after fault occurs, select faulty line, provide actuating signal excision fault, ensure the safe operation of power distribution network.
In a word, the small electric current grounding system of distribution network fault line selection method for singlephasetoground fault calculated amount that the present invention proposes is little, and realtime is good, strong adaptability, and accuracy rate is high, has engineering practical value.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of neutral by arc extinction coil grounding system failure route selection;
Fig. 2 is small current neutral grounding system Case Simulation model;
Fig. 3 is each circuit zerosequence current of Case Simulation and the poor figure of biphase current;
Embodiment
Technical conceive of the present invention:
The basic thought of selection method of the present invention is, bus threephase voltage, bus residual voltage, each feeder line threephase current and zero sequence current signal are sampled, and obtains voltage, current sampling signal sequence; The time occurring by fault generation judging unit detection failure, threephase current and the zero sequence current signal of each feeder line collecting in oneperiod from fault occurs to start to choose fault constantly and occurs; According to bus threephase voltage, by Novel Faulty Phase Selector, select the phase that fault occurs, and it is poor according to the fault phase of selecting, to calculate the biphase current of fault phase electric current and all the other healthy phases; Adopt the method for the digital signal processing of digital notch partly to carry out filtering to the 50Hz power frequency in the zerosequence current obtaining and biphase current difference signal, the transition function of digital trap is
$H\left(z\right)=\frac{B\left(z\right)}{A\left(z\right)}=\frac{(z{e}^{2\mathrm{\π}{f}_{0}})(z{e}^{{j2\mathrm{\πf}}_{0}})}{(z{\mathrm{ae}}^{2\mathrm{\π}{f}_{0}})(z{\mathrm{ae}}^{{j2\mathrm{\πf}}_{0}})},$ Wherein a is and the depth parameter of trapper, and a is larger, and notch depth is darker, gets a=0.96, f in the design
_{0}for treating the frequency size of elimination, get 50Hz.Finally zerosequence current and the poor correlation analysis that carries out of biphase current to each feeder line after digital notch is processed, selects faulty line.The specific works principle of method is as follows:
The principle of 1 correlation analysis
Correlation analysis is important instrument during signal is processed, and can be used for studying the similarity of two signals, or signal self similarity after time delay, thereby realizes detection, the identification and extraction of signal.
The related function of digital signal x (n), y (n) is defined as:
In formula, the sampling number that N is coherent signal, the time difference between two signals is jt
_{s}, t
_{s}for sampling time interval (j=0,1 ...).
The autocorrelation of digital signal x (n) is defined as
Signal x (n) and y (n) are carried out related calculation, and signal Ax (n) and By (n) are made to related operation (A and B are coefficient), twice computing be not because the correlation operation value that the difference of amplitude obtains can be identical.Therefore, for the correlativity of more different amplitude signal waveforms, just should get rid of the impact of signal amplitude, must make normalized to related operation for this reason.
The rootmeansquare value of signal x (n), y (n) is
Therefore, signal correction computing can be expressed as in normalization
Normalized correlation ρ
_{xy}be called crosscorrelation coefficient, its span is [1 ,+1], and+1 represents two signal 100% positive correlations;1 represents two signal 100% negative correlation, but the just the same phase place of shape is just in time contrary; 0 value is called as zero correlation, in other words two signals completely independent, have no relation.
2 route selection principles based on correlation analysis
During neutral by arc extinction coil grounding system generation singlephase earth fault, the transient current of earth point has comprised all sound and nontransient state capacitance current in circuit and transient state inductive currents of arc suppression coil place branch road of perfecting.With the transient current that the fault phase transient current of each feeder line deducts respectively two other healthy phases, obtain the poor i of transient state biphase current of circuit
_{f1}and i
_{f2}.For fault feeder, i
_{f1}and i
_{f2}the transient fault electric current and the fault phase transient state capacitive earth current sum that are actually earth point deduct respectively two other healthy phases transient state capacitive earth current; Transient state earthfault current direction is by line flows to bus, and healthy phases transient state capacitance current flows to circuit by bus, and healthy phases transient state capacitive earth current is with respect to trouble spot transient state ground current i
_{f}smaller.Comprehensive above 2 considerations, the i of faulty line
_{f1}and i
_{f2}than i
_{f}, wave form varies is very little.So i
_{f1}and i
_{f2}meet following relation and (suppose that A is fault phase mutually, now
I in formula
_{f}for trouble spot transient state ground current,
be respectively the threephase fault electric current of faulty line.
In taking into account system, threephase load is symmetrical, thereby the transient zerosequence current of faulty line is:
be respectively faulty line threephase transient state capacitive earth current;
transient zerosequence current for faulty line.On faulty line zerosequence current numerical value, equal all transient state inductive current sums that perfect circuit transient state capacitive earth current and arc suppression coil.
Formula (6) is become to the form that contains zerosequence current as follows:
By the known i of analysis above
_{f}with
opposite direction, and on numerical value the former much larger than the latter.Consider
with
just mutually there is very lowangle phase differential, might as well use
substitute
with
In now can supposing the system, have increased consistent with a faulty line parameter feeder line that perfects, after fault occurs, the zerosequence current producing on this virtual feeder line is 3i
_{0}, in faulty line, biphase current is poor so
be equivalent to the poor of zerosequence current on the zerosequence current of faulty line and virtual feeder line.
The transient zerosequence current of nonfault line is:
Wherein,
be respectively the threephase transient state capacitive earth current that perfects circuit.For its i of nonfault line
_{f1}and i
_{f2}, because feeder line threephase transient state capacitance current size differences is little, just there is phase differential, so i in poor for fault phase transient state capacitive earth current and healthy phases transient state capacitive earth current
_{f1}and i
_{f2}meet following relation (suppose that A is mutually for fault phase,
Therefore, can realize failure line selection by the poor correlativity of the zerosequence current of each feeder line and the biphase current of corresponding feeder line relatively, if fault occurs in A phase, the transient zerosequence current of faulty line so
poor with the biphase current of faulty line
with
correlativity close to 1, and perfect the transient zerosequence current i of circuit
_{l0}poor with the transient state biphase current that perfects circuit
with
correlativity is close to 0.
With this, form new faultline selecting method: when fault occurs, first the moment t that failure judgement occurs, choosing 1 cycle after fault is data window, and the data in data window, by the power frequency component containing in digital notch elimination data, and are obtained to fault phase by phase selection element.If fault phase is A phase,, to the zerosequence current of all feeder lines and the corresponding poor correlation analysis that carries out of biphase current, obtain relative coefficient ρ
_{1}(k), ρ
_{2}(k), define comprehensive relative coefficient
form integrated correlation coefficient matrix E=[ρ (1), ρ (2) ..., ρ (M)].Find the maximal value ρ in integrated correlation coefficient matrix
_{max}with minimum value ρ
_{min}, when meeting ρ
_{max}ρ
_{min}>=0.5, in decisionmaking system, singlephase earth fault has occurred, and faulty line is integrated correlation coefficient ρ
_{max}corresponding feeder line; If ρ
_{max}ρ
_{min}<0.5, judges that fault has occurred at bus place, k=1 wherein, 2..., N.
Below with reference to the drawings and specific embodiments, the present invention is described in further details:
Embodiment 1:
Consider that in actual distribution network, feeder line is more, and there is the situation that cable mixes.The small current neutral grounding system of having set up 35kV herein under MATLAB/SIMULINK environment is as Fig. 2.Wherein G is infinitely great power supply; T is maintransformer, and noload voltage ratio is 110kV/35kV, and connection group is YN/d11; T
_{z}for Zshaped transformer; L is arc suppression coil; R is the damping resistance of arc suppression coil.Circuit 1 is JC1 type overhead transmission line, and line length is 15km; Circuit 2 is YJV2335/95 cable, and line length is 6km; Circuit 3 is JM1 pole line, and length is 18km; Circuit 4 is JS1 pole line and YJV2335/95 type cable hybrid line, and length is respectively 12km and 5km; Circuit 5 is JS1 type overhead transmission line, and length is 30km; Circuit 6 is YJV2335/95 type cable line, and length is 8km.During normal operation, adopt 10% overcompensation, after fault occurs, adopt full compensation; R cancels 10% of arc coil induction reactance; Sample frequency is got 8KHz.
As shown in Fig. 1 in accompanying drawing explanation, when A phase singlephase earth fault occurs apart from bus 2km place for the feeder line 1 of electrical network, fault close angle is 30 ° and transition resistance size while being 20 Ω, and the concrete steps of the distribution network fault line selection method based on transient signal correlation analysis of the present embodiment are as follows:
Step 1):
With sample frequency 8000Hz, the residual voltage of power distribution network bus is carried out to realtime sampling, if continuous three sampled value u of residual voltage
_{0}(n), u
_{0}(n+1), u
_{0}(n+2) be all greater than 0.15 times of bus rated voltage, judge on this bus or this bus and have feeder line that singlephase earth fault has occurred; Otherwise, judge that power distribution network is in normal operating condition, continue sampling and monitor residual voltage sampled value;
Step 2):
If judge there is singlephase earth fault in power distribution network, record now corresponding moment t=0.04167s, if now corresponding sampled point is initial sampled point, and with sample frequency 8000Hz sampling record trouble, there is threephase current and the zerosequence current of all feeder lines on the interior bus threephase voltage of a rear power frequency period (20 milliseconds) and bus, obtain respectively corresponding sampled value sequence u
_{a}(n), u
_{b}(n), u
_{c}(n), i
_{a.k}(n), i
_{b.k}(n), i
_{c.k}(n), i
_{0.k}(n), n=1,2,3 ..., N, k=1,2,3 ..., 6; N is sampled point sequence number, and N=160 is a sampling number in power frequency period, and k is each feeder line sequence number;
Step 3):
Calculate as follows the effective value U of bus threephase voltage after fault
_{a}, U
_{b}, U
_{c}:
Step 4):
Compare bus threephase voltage U
_{a}, U
_{b}, U
_{c}size, obtain U
_{a}<U
_{b}=U
_{c}, get minimum voltage value U
_{a}corresponding A is fault phase mutually;
Step 5):
The zerosequence current of collect 6 feeder lines and threephase current are carried out respectively to digital notch processing, and elimination is 50Hz power frequency component wherein;
Step 6):
Because the selected fault phase of step 4 is A phase, good route selection flow process is carried out asking for of the poor and related coefficient of biphase current: i according to a preconcerted arrangement
_{aB.k}(n)=i
_{a.k}(n)i
_{b.k}and i (n)
_{aC.k}(n)=i
_{a.k}(n)i
_{c,k}(n), and respectively calculate
The poor i of feeder line biphase current
_{aB.k}(n), i
_{aC.k}(n) with this feeder line zerosequence current i
_{0.k}(n) related coefficient:
Wherein, k=1,2,3 ..., 6, N=160, calculates respectively to such an extent that the related coefficient of every feeder line is as follows:
ρ
_{1}(k=1)=0.9792，ρ
_{2}(k=1)=0.9814；
ρ
_{1}(k=2)=0.1019，ρ
_{2}(k=2)=0.0753；
ρ
_{1}(k=3)=0.1571，ρ
_{2}(k=3)=0.1562；
ρ
_{1}(k=4)=0.0729，ρ
_{2}(k=4)=0.0679；
ρ
_{1}(k=5)=0.0088，ρ
_{2}(k=5)=0.0597；
ρ
_{1}(k=6)=0.0199，ρ
_{2}(k=6)=0.0027；
Step 7):
The integrated correlation coefficient of asking for each feeder line is as follows:
ρ (k=1)=0.9803, ρ (k=2)=0.0088, ρ (k=3)=0.1567, ρ (k=4)=0.0704, ρ (k=5)=0.0343, ρ (k=6)=0.0086; Forming integrated correlation coefficient matrix is: E=[0.9803 ,0.0088,0.1567 ,0.0704 ,0.0343,0.0086];
Step 8):
The integrated correlation coefficient matrix that each circuit that comparison step 7 obtains forms, finds maximal value and minimum value wherein and compares ρ
_{max}ρ
_{min}with ρ
_{set}size, meet ρ
_{max}ρ
_{min}=1.1507>0.5=ρ
_{set}, in decisionmaking system there is singlephase earth fault in feeder line, and faulty line is ρ
_{max}corresponding circuit 1;
In the situation that carrying out emulation to the present embodiment, different fault types, faulty line, fault close angle, fault distance, fault phase and transition resistance obtain this patent algorithm simulating result as table 1:
Line selection algorithm result under table 1 different faults condition
The method has very strong antijamming capability, route selection that equally can be correct in the situation that of noise, herein by add the white Gaussian noise of 15db in current signal, verified that circuit 1, apart from bus 2km, transition resistance, singlephase earth fault occurs while being 20 Ω, when different fault close angles, route selection result is as table 2:
Table 2 adds route selection result after white Gaussian noise
θ  Related coefficient  Result 
0  [0.8114 0.0568 0.0433 0.0931 0.0092 0.1055]  Correctly 
30  [0.9076 0.0020 0.0762 0.0226 0.0520 0.0364]  Correctly 
60  [0.947 0.0027 0.0106 0.0296 0.0543 0.0742]  Correctly 
90  [0.9768 0.1006 0.0405 0.1032 0.1749 0.0904]  Correctly 
Claims (1)
1. the lowcurrent ground fault line selection method based on the correlation analysis of faultsignal transient state, is characterized in that, comprises following step:
Step 1: with sample frequency 8000Hz, the residual voltage of power distribution network bus is carried out to realtime sampling, if continuous three sampled value u of residual voltage
_{0}(n), u
_{0}(n+1), u
_{0}(n+2) be all greater than 0.15 times of bus rated voltage, judge on this bus or this bus and have feeder line that singlephase earth fault has occurred; Otherwise, judge that power distribution network is in normal operating condition, continue sampling and monitor residual voltage sampled value;
Step 2: singlephase earth fault has occurred power distribution network if judge, with sample frequency 8000Hz sampling record trouble, there is threephase current and the zerosequence current of all feeder lines on the interior bus threephase voltage of a rear power frequency period (20 milliseconds) and bus, obtain respectively corresponding sampled value sequence u
_{a}(n), u
_{b}(n), u
_{c}(n), i
_{a.k}(n), i
_{b.k}(n), i
_{c.k}(n), i
_{0.k}(n), n=1,2,3 ..., N, k=1,2,3 ... M; N is sampled point sequence number, and N=160 is a sampling number in power frequency period, and k is each feeder line sequence number, and M is the number of feeder line on bus;
Step 3: the effective value U that calculates as follows bus threephase voltage after fault
_{a}, U
_{b}, U
_{c}:
Step 4: compare bus threephase voltage U
_{a}, U
_{b}, U
_{c}size, get minimum voltage value corresponding mutually for fault phase;
Step 5: the zerosequence current of each feeder line collecting and threephase current are carried out to digital notch processing, and elimination is 50Hz power frequency component wherein;
Step 6: according to the selected fault phase of step 4, calculate the poor and related coefficient of the biphase current of each feeder line:
If fault phase is A phase, ask for i
_{aB.k}(n)=i
_{a.k}(n)i
_{b.k}and i (n)
_{aC.k}(n)=i
_{a.k}(n)i
_{c.k}(n), and respectively calculate the poor i of biphase current
_{aB.k}(n), i
_{aC.k}(n) with corresponding feeder line zerosequence current i
_{0.k}(n) dependency number:
If fault phase is B phase, ask for i
_{bA.k}(n)=i
_{b.k}(n)i
_{a.k}and i (n)
_{bC.k}(n)=i
_{b.k}(n)i
_{c.k}(n), and respectively calculate the poor i of biphase current
_{bA.k}(n), i
_{bC.k}(n) with corresponding feeder line zerosequence current i
_{0.k}(n) related coefficient:
If fault phase is C phase, ask for i
_{cA.k}(n)=i
_{c.k}(n)i
_{a.k}and i (n)
_{cB.k}(n)=i
_{c.k}(n)i
_{b.k}(n), and respectively calculate the poor i of biphase current
_{cA.k}(n), i
_{cB.k}(n) with corresponding feeder line zerosequence current i
_{0.k}(n) related coefficient:
Wherein, k=1,2,3 ... M;
Step 7: the integrated correlation coefficient that calculates each feeder line
k=1,2,3 ... M, forms integrated correlation coefficient matrix E=[ρ (1), ρ (2) ..., ρ (M)];
Step 8: the correlation coefficient threshold ρ of setting
_{set}=0.5, the integrated correlation coefficient of each feeder line that comparison step 7 obtains, finds maximal value ρ wherein
_{max}with minimum value ρ
_{min}, and compare ρ
_{max}ρ
_{min}with ρ
_{set}size, if meet ρ
_{max}ρ
_{min}>=ρ
_{set}, in decisionmaking system, singlephase earth fault has occurred, and faulty line is integrated correlation coefficient ρ
_{max}corresponding feeder line; If meet ρ
_{max}ρ
_{min}< ρ
_{set}, be judged to be bus place singlephase earth fault occurred.
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CN107449979A (en) *  20170619  20171208  国网湖南省电力公司计量中心  A kind of Current Voltage state monitoring method and device based on fundamental wave zero sequence feature 
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CN107688135B (en) *  20170704  20200417  广西大学  Singlephase earth fault line selection method of smallcurrent grounding system based on FastICA 
CN107632225A (en) *  20170811  20180126  国网湖南省电力公司  A kind of small current system Earth design method 
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CN109164339A (en) *  20180727  20190108  国电南瑞科技股份有限公司  The statistics and methods of exhibiting of road sequence accuracy rate are drawn in a kind of bus small current neutral grounding 
CN109633366A (en) *  20181031  20190416  国家电网有限公司  A kind of onephase earthing failure in electric distribution network phaseselecting method and phase selection device 
CN109782114A (en) *  20190329  20190521  云南电网有限责任公司电力科学研究院  A kind of full compensation of ground malfunction method of discrimination of controllable voltage source and system 
CN110118912A (en) *  20190423  20190813  武汉理工大学  It is a kind of that wire selection method for power distribution network single phase earthing failure is grounded through arc suppression coil device based on grey correlation analysis 
CN110118912B (en) *  20190423  20220201  武汉理工大学  Grey correlation analysisbased singlephase earth fault line selection method for arc suppression coil devicegrounded power distribution network 
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CN110907761A (en) *  20191209  20200324  四川旭华源科技有限公司  Continuous line selection method and system for singlephase earth fault 
CN111308398A (en) *  20200331  20200619  深圳供电局有限公司  Method and device for judging polarity of zero sequence current transformer in transformer substation 
CN112255497A (en) *  20200910  20210122  西安理工大学  Fault line selection method based on fundamental frequency correlation and maximum correlation distance 
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