CN106597227A - Method and device for determining single-phase-to-ground fault based on global wavelet coefficient balance method - Google Patents
Method and device for determining single-phase-to-ground fault based on global wavelet coefficient balance method Download PDFInfo
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- CN106597227A CN106597227A CN201611254981.8A CN201611254981A CN106597227A CN 106597227 A CN106597227 A CN 106597227A CN 201611254981 A CN201611254981 A CN 201611254981A CN 106597227 A CN106597227 A CN 106597227A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- 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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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention provides a method and device for determining single-phase-to-ground fault based on global wavelet coefficient balance method wherein the method comprises: synchronously obtaining the to-be-detected circuits with grounding fault, the zero-sequence current and three-phase current of the power supply branches; conducting wavelet transformation to the zero-sequence current and three-phase current of the power supply branches to obtain the zero-sequence wavelet mode coefficient of each power supply branch and the wavelet mode coefficient for each phase of each power supply branch; according to the balance relationship between the maximum value of the zero-sequence wavelet mode coefficient of each power supply branch or the maximum value of the absolute value, determining the power supply branch with grounding fault; and according to the relationship between the maximum value of the wavelet mode coefficient of each phase of the power supply branch or the maximum value of the absolute value, determining the phase of the power supply branch with grounding fault. The embodiments of the invention solve the technical problems of an existing threshold value determining method with excessive complexity and inaccurate results so that branches and phases with fault can be identified rapidly and conveniently.
Description
Technical field
The present invention relates to distrbution network technical field, more particularly to a kind of to judge single-phase based on global wavelet coefficient counterbalanced procedure
The method and apparatus of earth fault.
Background technology
As earthing mode is many in 10kv distributions, and affected by actual track physical arrangement and Regional Distribution, cause to connect
The more difficult judgement of earth fault.Judge that the mode of earth fault mainly has at present：Injecting signal, line mutual-ground capacitor electric discharge, zero
Sequence electric current determining method, three phase-to-ground voltage relative methods etc..
Wherein, injecting signal needs outer signal source, easily brings extra potential faults to electric power system.In addition,
The frequency of Injection Signal selects the correctness for also influencing whether route selection.Line mutual-ground capacitor electric discharge is subject to the external extinguishing arc of neutral point
The impact of coil is larger, is easily caused the accuracy of failure line selection than relatively low.Three phase-to-ground voltage relative methods need to measure three-phase
Voltage-to-ground, determines Earth Phase according to the sequence of magnitude of voltage size, however, the direct measurement voltage-to-ground in actual distribution line
It is not very convenient.
As seen from the above analysis, there is presently no the mode that can quickly recognize line single phase grounding failure.Ask for this
Topic, not yet proposes effective solution at present.
The content of the invention
A kind of method that singlephase earth fault is judged based on global wavelet coefficient counterbalanced procedure is embodiments provided, with
The purpose for quick and precisely recognizing be out of order power supply branch road and failure phase is reached, the method includes：
Earth fault line to be detected is obtained, the zero-sequence current and three-phase current of each power supply branch road；
Wavelet transformation is carried out to the zero-sequence current and three-phase current of each power supply branch road, each power supply branch road is obtained
The small echo mode coefficient of zero sequence small echo mode coefficient and each each phase of branch road of powering；
According to the equilibrium relation between the zero sequence small echo mode coefficient maximum or the maximum of absolute value of each power supply branch road,
Determine the power supply branch road of earth fault；
According to the relation between the small echo mode coefficient maximum or the maximum of absolute value of each power supply branch road each phase, really
Failure phase in fixed out of order power supply branch road.
In one embodiment, according to each power supply branch road zero sequence small echo mode coefficient maximum or absolute value maximum
Equilibrium relation between value, determines the power supply branch road of earth fault, including：
The maximum of zero sequence small echo mode coefficient or the maximum of absolute value in power supply branch road are approximately equal to except the power supply
The power supply branch road of the maximum sum of the maximum or absolute value of the zero sequence small echo mode coefficient of other the power supply branch roads outside road, really
It is set to the power supply branch road of failure.
In one embodiment, the electric current small echo mode coefficient maximum or absolute value according to each power supply branch road each phase
Maximum between relation, determine it is out of order power supply branch road in failure phase, including：
By the phase of small echo mode coefficient maximum or maximum absolute value in each power supply branch road, the small echo mode coefficient of each phase,
The failure phase being defined as in the power supply branch road of failure.
In one embodiment, according to each power supply branch road zero sequence small echo mode coefficient maximum or absolute value most
Equilibrium relation between big value, after determining the power supply branch road of earth fault, methods described also includes：
Whether the power supply branch road according to each failure to earth electric field, judgement determined of power supply branch road in failure is event
The power supply branch road of barrier.
In one embodiment, according to each failure to earth electric field, judgement determined of power supply branch road in failure
Power supply branch road be whether failure power supply branch road, including：
The power supply branch road that the earth electric field short time will be gone to zero in each power supply branch road, as the power supply branch road of failure；
By the power supply branch road of the failure by determining to earth electric field, with the failure determined by zero sequence small echo mode coefficient
Power supply branch road be compared；
If any identical, then judge that the power supply branch road of the failure determined is the power supply branch road of failure；
If it is not the same, then judging that the power supply branch road of the failure determined is not necessarily the power supply branch road of failure.
The embodiment of the present invention additionally provides a kind of device that singlephase earth fault is judged based on global wavelet coefficient counterbalanced procedure,
To reach the purpose for quick and precisely recognizing be out of order power supply branch road and failure phase, the device includes：
Acquisition module, obtains earth fault line to be detected for synchronous, the zero-sequence current and three-phase of each power supply branch road
Electric current；
Conversion module, for carrying out wavelet transformation to the zero-sequence current and three-phase current of each power supply branch road, obtains
The small echo mode coefficient of the zero sequence small echo mode coefficient of each power supply branch road and each each phase of branch road of powering；
First determining module, for the maximum of zero sequence small echo mode coefficient maximum or absolute value according to each power supply branch road
Equilibrium relation between value, determines out of order power supply branch road；
Second determining module, for according to the small echo mode coefficient maximum or absolute value of each power supply branch road each phase most
Relation between big value, determines the failure phase in out of order power supply branch road.
In one embodiment, first determining module specifically for by each power supply branch road in zero sequence small echo module system
The maximum of several maximums or absolute value is approximately equal to the zero sequence small echo mould of other the power supply branch roads in addition to the power supply branch road
The power supply branch road of the maximum sum of the maximum or absolute value of coefficient, is defined as the power supply branch road of failure.
In one embodiment, second determining module specifically for by each power supply branch road, each phase it is little
The phase of small echo mode coefficient maximum or maximum absolute value in ripple mode coefficient, the failure phase being defined as in the power supply branch road of failure.
In one embodiment, also include：Judge module, in the zero sequence small echo module system according to each power supply branch road
Number, after determining the power supply branch road of failure, according to each failure to earth electric field, judgement determined of power supply branch road in failure
Power supply branch road be whether failure power supply branch road.
In one embodiment, the judge module includes：
First determining unit, for will power supply branch road that the earth electric field short time is gone to zero in each branch road of powering, as
The power supply branch road of failure；
Comparing unit, for by the power supply branch road of the failure by determining to earth electric field, and by zero sequence small echo module system
The power supply branch road of the failure that number is determined is compared；
First identifying unit, for it is determined that in the case of identical, judging that the power supply branch road of the failure determined is failure
Power supply branch road；
Second identifying unit, in the case of it is determined that differing, judging that the power supply branch road of the failure determined differs
Surely it is the power supply branch road of failure.
In embodiments of the present invention, wavelet transformation is carried out by the zero-sequence current and three-phase current to each power supply branch road,
The small echo mode coefficient of the zero sequence small echo mode coefficient and each each phase of branch road of powering of each power supply branch road is obtained, is out of order with determining
Power supply branch road and power supply phase, so as to excessively complicated, and the inaccurate skill of result that solves existing determination fault branch process
Art problem, has reached the technique effect for quick and precisely identifying fault branch and failure phase.
Description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, not
Constitute limitation of the invention.In the accompanying drawings：
Fig. 1 be the failure of backbone according to embodiments of the present invention power branch road and failure phase determination method method stream
Cheng Tu；
Fig. 2 is the method flow diagram of route selection according to embodiments of the present invention and phase selection；
Fig. 3 is the concrete grammar flow chart of route selection according to embodiments of the present invention and phase selection；
Fig. 4 be the failure of backbone according to embodiments of the present invention power branch road and failure phase determining device structural frames
Figure.
Specific embodiment
It is to make the object, technical solutions and advantages of the present invention become more apparent, with reference to embodiment and accompanying drawing, right
The present invention is described in further details.Here, the exemplary embodiment of the present invention and its illustrate for explaining the present invention, but and
It is not as a limitation of the invention.
In embodiments of the present invention, the ground connection situation according to analogue simulation 10KV electric power systems, proposes synchronous monitoring power transformation
The electric current of all branch's outlets and to earth electric field on a certain bar backbone, then, to line electricity flow valuve during failure and zero sequence electricity
Flow valuve carries out db5 wavelet transformations, to determine the rule of small echo mode coefficient, in conjunction with monitoring point electric field change over the ground, judges monitoring
Whether branch road has generation earth fault.It is higher to earth fault line selection judging nicety rate by this way, and be distributed in monitoring point
In the case of extensive, the scene of failure can also be reported.
As shown in figure 1, embodiments provide a kind of failure of backbone powering the determination side of branch road and failure phase
Method, may include steps of：
Step 101：It is synchronous to obtain earth fault line to be detected, the zero-sequence current and three-phase current of each power supply branch road；
I.e., it is possible to be synchronous to obtain earth fault line to be detected, each power supply branch road when branch road of powering breaks down
Zero-sequence current and three-phase current.For example, four branch roads are had on current backbone：Tie point, the second branch road, the 3rd
Road and the 4th branch road, then just obtain this zero-sequence current of four branch roads in failure respectively, and obtain this four branch roads each
Three-phase (A phase, B phase, C phase) electric current in each phase electric current.
Above-mentioned zero-sequence current value can measure Vector modulation technology by three-phase synchronous and obtain.
Step 102：Wavelet transformation is carried out to the zero-sequence current and three-phase current of each power supply branch road, each confession is obtained
The small echo mode coefficient of the zero sequence small echo mode coefficient of electric branch road and each each phase of branch road of powering；
Specifically, can be that zero-sequence current and three-phase current to each power supply branch road do db5 wavelet transformations.What is realized
When, wavelet coefficient can be sought out by wave filter, wherein, the filter factor of the wave filter for being used can be expressed as：
H1 [k]=.0033357 .012581 ,-.0062415 ,-.077571 ,-.032245 .24229 .13843 ,-
.72431,.60383,-.1601}；
Step 103：According between the zero sequence small echo mode coefficient maximum or the maximum of absolute value of each power supply branch road
Equilibrium relation, determines the power supply branch road of earth fault；
When realization, out of order power supply branch road can be determined according to following rule：By zero sequence in each power supply branch road
The maximum of the maximum or absolute value of small echo mode coefficient is approximately equal to zero of other the power supply branch roads in addition to the power supply branch road
The power supply branch road of the absolute value sum of sequence small echo mode coefficient, is defined as the power supply branch road of failure.That is, failure is carried out by the rule
Route selection.
In order to the fault branch for further verifying determination it is whether correct, and from the branch road of global angle-determining failure, in root
According to the zero sequence small echo mode coefficient of each power supply branch road, after determining the power supply branch road of failure, can be with according to each power supply branch road
In failure to earth electric field, judge that whether the power supply branch road of the failure determined is the power supply branch road of failure.
Specifically, the power supply branch road that the earth electric field short time will can be gone to zero in each power supply branch road, as failure
Power supply branch road；It is then determined that whether the power supply branch road that two ways determines is same branch road, if it is, representing it is confirmed that just
True, if not same branch road, then can redefine, there is the possibility of erroneous judgement, needs are further corrected.
Step 104：According between the small echo mode coefficient maximum or the maximum of absolute value of each power supply branch road each phase
Relation, determine it is out of order power supply branch road in failure phase.
When realization, the failure phase in the power supply branch road of failure can be determined according to following rule：Will be in each power supply
In branch road, the small echo mode coefficient of each phase, the phase of small echo mode coefficient maximum or maximum absolute value, is defined as the power supply branch road of failure
In failure phase.That is, Fault Phase Selection is carried out by the rule.
Enter with reference to power to the failure of the above-mentioned backbone determination method of branch road and failure phase of a specific embodiment
Row explanation, it should be noted, however, that the specific embodiment merely to the application is better described, is not constituted to this Shen
Improper restriction please.
Before failure determination is carried out, specific judgment rule can be first determined, can carry out building and number for artificial circuit
According to acquisition：10KV supply network circuits are built under electric analog platform, electric analog platform can adopt MATLAB electric power
Analogue system is completed.From power plant to power transformation transmission link, three power supply branch roads can be built, wherein, neutral point adopts extinguishing arc
Coil Contact patch.First power supply branch road and Article 2 leg length of powering is 10KM, the parameter setting of Article 3 branch road
It is consistent with first power supply branch road and Article 2 branch road of powering, but, line length is set to 5Km.At 5Km, three-phase is placed
There is module in failure.
A length of 0.3 second when arranging emulation, simulation algorithm adopts ODE23TB, and failure occurs to power branch road 5Km positioned at Article 3
, there is C phase singlephase earth faults in place.
Data analysiss are carried out based on above-mentioned artificial circuit, be may include steps of：
S1：Electric current wavelet data is analyzed：
For general signal, ifThen the continuous wavelet transform of f (t) is defined as：
In actual applications, discrete binary wavelet transformation is taken, is made：J, k ∈ Z, then have：
In view of electrical network touchdown time, necessarily there is transient changing in line current, and this change is especially suitable for carrying out small echo
Transform analysis.
Fault simulation data pick-up is carried out to above-mentioned artificial circuit, respectively to the A phase, B phase, C phase of three branch roads in failure
State transient current does db5 wavelet transformations.Wavelet coefficient can be sought out by wave filter, its analysis filter coefficient is as follows：
H1 [k]=.0033357 .012581 ,-.0062415 ,-.077571 ,-.032245 .24229 .13843 ,-
.72431,.60383,-.1601}；
Through db5 wavelet analysises, the result as shown in table 1 below to table 3 can be obtained.Simulated conditions take 90 degree of A phase places, L1
(first power supply branch road), L2 (Article 2 power branch road) fault-free, at L3 (Article 3 power branch road) 5Km there is ground connection in C phases
Failure.Wherein, the zero-sequence current value of overhead transmission line can measure Vector modulation technology by three-phase synchronous and obtain.
Table 1：The Wavelet Transform Modulus Maximum coefficient of L3 branch roads
Table 2：L1 branch road Wavelet Transform Modulus Maximum coefficients.
Table 3：L2 branch road Wavelet Transform Modulus Maximum coefficients
Above-mentioned table 1 is analyzed to table 3, following judgment rule can be obtained：
1) on the branch feeding circuit of some backbone of electric substation, the zero-sequence current small echo mode coefficient pole of fault branch
Big value or absolute value maximum are approximately the zero-sequence current small echo mode coefficient absolute value sum of non-faulting branch road.
I(1015)≈I(983)+I(970)
Abs(I(970))≈abs(I(1015))+abs(I(994))
2) on the branch feeding circuit of some backbone of electric substation, the failure phase wavelet transformation mode coefficient of fault branch
Maximum or maximum absolute value is obtained in all branch roads and all phase sequences.
Failure line selection (that is, determining fault branch) 1) can be used for by above-mentioned judgment rule, by above-mentioned judgment rule
2) can be used for Fault Phase Selection (that is, determining fault phase).Do as this emulation experiment connects arc suppression coil at neutral point,
Arc suppression coil inhibits circuit discharge process over the ground so as to which conclusion has more general meaning.
S2：Analysis of electric field over the ground
In ground connection transient process, line current and of short duration acute variation can occur to earth electric field.If monitoring point is remote
From electric substation exit, then to being 0 in theory after earth electric field stable state at ground connection.In view of measurement error, this value is typically near
It is seemingly 0.Therefore, combined circuit small echo transient analysis result and over the ground electric field measurement analysis result, can further improve circuit
Earth fault judgment accuracy.This transient analysis method is affected less by neutral grounding mode, is adapted to neutral ground
Or isolated neutral system, so that the production of equipment manufacturer simplifies, application range of products is wider.
Circuit and phase place during in order to occur from global and whole power supply branch roads system angle-determining earth fault, such as Fig. 2
It is shown, can according to following steps determine failure occur when route selection and phase selection rule：
S1：Malfunction monitoring point is grouped, is demarcated as the same monitoring network segment；
S2：All monitoring point electric currents of synchro measure and to earth electric field during failure；
S3：Calculate zero sequence wavelet coefficient and monophase current wavelet coefficient, to earth electric field magnitude, sentence from global angle application
Disconnected rule (1) and rule (2)；
S4：With reference to falling to earth electric field, earthing wire-selecting and phase selection conclusion are given.
In upper example, the electric current of all branch's outlets and to earth electric field on a certain bar backbone of synchronous monitoring electric substation, so
Carry out db5 wavelet transformations afterwards to the line electricity flow valuve and zero-sequence current value during failure, study small echo mode coefficient rule, and combine prison
Measuring point electric field change over the ground, judges to monitor whether branch road has earth fault.
Which is applied to the optional position on any overhead transmission line, the three-phase line that synchro measure goes out at all monitoring points
Electric current during failure, each synthesizes zero-sequence current.Then, changed by measurement electric field transient and synthesize zero-sequence current to realize
Ground connection judges.Using the Wavelet Transform Modulus Maximum value coefficient mathematics of the zero-sequence current and line current of circuit during DB5 wavelet analysises failures
Equilibrium relation, obtains route selection conclusion and phase selection conclusion.
That is, on the branched line of some backbone of electric substation, the fault branch zero-sequence current of all branch monitoring points
DB5 small echo mode coefficient maximums (or maximum of its absolute value) is approximately non-faulting branch road zero-sequence current DB5 small echo mode coefficients
Maximum (or maximum of its absolute value) sum, wavelet coefficient equilibrium relation when this is failure can be used for power supply station and own
Route selection when branched line earth fault occurs.
In some trunk branch of electric substation, fault branch failure phase DB5 wavelet transformation mode coefficient maximum (or definitely
The maximum of value) obtain maximum in all branch roads and all phase sequences, the conclusion can be used for phase selection during failure.
Circuit and phase place during in order to occur from global and whole power supply branch roads system angle-determining earth fault, Ke Yi
The each monitoring point current value of synchro measure and electric field value over the ground during calculating, and provide clear and definite route selection when failure occurs and phase selection knot
By.Specifically, can be with as shown in figure 3, performing according to following concrete steps：
S1：Malfunction monitoring point is grouped, is demarcated as the same monitoring network segment；
S2：By all monitoring point line currents of sample frequency 4000HZ synchronous acquisition and electric field signal over the ground；
S3：Using wave filter：
H1 [k]=.0033357 .012581 ,-.0062415 ,-.077571 ,-.032245 .24229 .13843 ,-
.72431 .60383 ,-.1601 }, decompose the zero-sequence current wavelet coefficient and line current wavelet coefficient of institute's gathered data；
S4：Calculate each monitoring point zero-sequence current DB5 wavelet coefficients maximum and monophase current DB5 wavelet coefficients are very big
Value, to earth electric field magnitude, and determine each branch road wavelet conversion coefficient extreme value, from global angle application judging rules 1) and
Rule is 2)；
S5：Merge again and circuit is fallen to earth electric field, provide clear and definite single-phase grounding selecting and phase selection conclusion.
When actually realizing, route selection and phase selection can be carried out according to following two conclusions：
A) in some trunk branch of electric substation, the fault branch zero-sequence current DB5 small echo moulds of all branch monitoring points
Coefficient maximum (or maximum of its absolute value) be approximately non-faulting branch road zero-sequence current DB5 small echo mode coefficient maximums (or
The maximum of its absolute value) sum.Wavelet coefficient accurately equilibrium relation when this is failure, this conclusion are that earth fault occurs
When mathematics restricting relation substantially, this method is more accurate than existing threshold method (it needs to be determined that residual voltage threshold value).Because thresholding
Value is it is difficult to exactly determined in practice.Threshold value is bigger than normal, can fail to report.It is less than normal, can report by mistake.From physical essence, more
Necessarily other parts are few for part, so this coefficient equilibrium rule is inherent physics law.
This conclusion, can be used for route selection when all branched line earth faults of power supply station occur.
B) in some trunk branch of electric substation, fault branch failure phase DB5 wavelet transformation mode coefficient maximum (or absolutely
Maximum to being worth) obtain maximum in all branch roads and all phase sequences.
This conclusion, can be used for phase selection during failure.When zero sequence measurement requirement condition is loosened, this conclusion can also be same
When for choosing faulty line, thus can further expanding product, that product is reduced using motility is accurate to synchro measure
The dependence of property.But failure phase mode coefficient is maximum, and how much suitable gap is on earth with the value of other non-faulting phases, does not also clearly tie
By, therefore, in A) under the restriction of rule condition, B) rule is reasonable and necessary for phase selection.
Based on same inventive concept, a kind of failure of backbone is additionally provided in the embodiment of the present invention and is powered branch road and failure
The determining device of phase, as described in the following examples.As the failure of backbone is powered the determining device solution of branch road and failure phase
Certainly the principle of problem and the failure of backbone power branch road and failure phase determination method it is similar, therefore the failure of backbone powers
The enforcement of the determining device of branch road and failure phase may refer to the failure of backbone and power the determination method of branch road and failure phase
Implement, repeat part and repeat no more.Used below, term " unit " or " module " can realize the software of predetermined function
And/or the combination of hardware.Although the device described by following examples is preferably with software realizing, hardware, or soft
The realization of the combination of part and hardware is also what is may and be contemplated.Fig. 4 is that the failure of the backbone of the embodiment of the present invention is powered
A kind of structured flowchart of the determining device of road and failure phase, as shown in figure 4, can include：Acquisition module 401, conversion module
402nd, the first determining module 403 and the second determining module 404, are illustrated to the structure below.
Acquisition module 401, obtains earth fault line to be detected for synchronous, the zero-sequence current and three of each power supply branch road
Phase current；
Conversion module 402, for carrying out wavelet transformation to the zero-sequence current and three-phase current of each power supply branch road, obtains
To the small echo mode coefficient of the zero sequence small echo mode coefficient and each each phase of branch road of powering of each power supply branch road；
First determining module 403, for the zero sequence small echo mode coefficient maximum or absolute value according to each power supply branch road
Equilibrium relation between maximum, determines the power supply branch road of earth fault；
Second determining module 404, for small echo mode coefficient maximum or absolute value according to each power supply branch road each phase
Maximum between relation, determine it is out of order power supply branch road in failure phase.
In one embodiment, the first determining module 403 specifically can be used for zero sequence small echo module system in power supply branch road
The maximum of several maximums or absolute value is approximately equal to the zero sequence small echo mould of other the power supply branch roads in addition to the power supply branch road
The power supply branch road of the maximum sum of the maximum or absolute value of coefficient, is defined as the power supply branch road of failure.
In one embodiment, second determining module 404 specifically can be used in each power supply branch road, each phase
The phase of small echo mode coefficient maximum or maximum absolute value in small echo mode coefficient, the failure phase being defined as in the power supply branch road of failure.
In one embodiment, the power determining device of branch road and failure phase of the failure of backbone can also include：Sentence
Disconnected module, in the zero sequence small echo mode coefficient according to each power supply branch road, after determining the power supply branch road of failure, according to each
Power supply branch road in failure to earth electric field, judge that whether the power supply branch road of the failure determined is the power supply branch road of failure.
In one embodiment, judge module includes：First determining unit, for will each power branch road in over the ground electricity
The power supply branch road that the field short time goes to zero, as the power supply branch road of failure；Comparing unit, for will be by determining to earth electric field
Failure power supply branch road, be compared with the power supply branch road of the failure determined by zero sequence small echo mode coefficient；First judges
Unit, for it is determined that in the case of identical, judging that the power supply branch road of the failure determined is the power supply branch road of failure；Second sentences
Order unit, in the case of it is determined that differing, judging that the power supply branch road of the failure determined is not necessarily the power supply of failure
Branch road.
In another embodiment, a kind of software is additionally provided, the software is used to perform above-described embodiment and preferred reality
Apply the technical scheme described in mode.
In another embodiment, a kind of storage medium is additionally provided, be stored with the storage medium above-mentioned software, should
Storage medium is included but is not limited to：CD, floppy disk, hard disk, scratch pad memory etc..
As can be seen from the above description, the embodiment of the present invention realizes following technique effect：By to each power supply
The zero-sequence current and three-phase current of branch road carries out wavelet transformation, obtains zero sequence small echo mode coefficient and each confession of each power supply branch road
The small echo mode coefficient of electric each phase of branch road, to determine out of order power supply branch road and power supply phase, so as to solve existing determination
Fault branch process is excessively complicated, and the inaccurate technical problem of result, has reached
The technique effect of barrier phase.
Obviously, those skilled in the art should be understood that each module or each step of the above-mentioned embodiment of the present invention can be with
Realized with general computing device, they can be concentrated on single computing device, or be distributed in multiple computing devices
On the network for being constituted, alternatively, they can be realized with the executable program code of computing device, it is thus possible to by it
Store in the storage device by computing device performing, and in some cases, can be holding different from order herein
The shown or described step of row, or they are fabricated to each integrated circuit modules respectively, or will be multiple in them
Module or step are fabricated to single integrated circuit module to realize.So, the embodiment of the present invention is not restricted to any specific hard
Part and software are combined.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for the skill of this area
For art personnel, the embodiment of the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made
Any modification, equivalent substitution and improvements etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of method that singlephase earth fault is judged based on global wavelet coefficient counterbalanced procedure, it is characterised in that include：
It is synchronous to obtain earth fault line to be detected, the zero-sequence current and three-phase current of each power supply branch road；
Wavelet transformation is carried out to the zero-sequence current and three-phase current of each power supply branch road, the zero sequence of each power supply branch road is obtained
The small echo mode coefficient of small echo mode coefficient and each each phase of branch road of powering；
According to the equilibrium relation between the zero sequence small echo mode coefficient maximum or the maximum of absolute value of each power supply branch road, it is determined that
Go out the power supply branch road of earth fault；
According to the relation between the small echo mode coefficient maximum or the maximum of absolute value of each power supply branch road each phase, determine
Failure phase in the power supply branch road of failure.
2. method according to claim 1, it is characterised in that maximum according to the zero sequence small echo mode coefficient of each power supply branch road
Equilibrium relation between value or the maximum of absolute value, determines the power supply branch road of earth fault, including：
Will in power supply branch road the maximum of zero sequence small echo mode coefficient or the maximum of absolute value be approximately equal to except the power supply branch road it
The power supply branch road of the maximum sum of the maximum or absolute value of the zero sequence small echo mode coefficient of other outer power supply branch roads, is defined as
The power supply branch road of failure.
3. method according to claim 1, it is characterised in that according to the electric current small echo module system of each phase of each power supply branch road
Relation between number maximum or the maximum of absolute value, determines the failure phase in out of order power supply branch road, including：
By the phase of the maximum of small echo mode coefficient maximum or absolute value in each power supply branch road, the small echo mode coefficient of each phase,
The failure phase being defined as in the power supply branch road of failure.
4. method according to claim 1, it is characterised in that according to the zero sequence small echo mode coefficient of each power supply branch road most
Equilibrium relation between big value or the maximum of absolute value, after determining the power supply branch road of earth fault, methods described is also wrapped
Include：
Whether the power supply branch road according to each failure to earth electric field, judgement determined of power supply branch road in failure is failure
Power supply branch road.
5. method according to claim 4, it is characterised in that according to each power supply branch road in failure to earth electric field,
Whether the power supply branch road of the failure that judgement is determined is the power supply branch road of failure, including：
The power supply branch road that the earth electric field short time will be gone to zero in each power supply branch road, as the power supply branch road of failure；
By the power supply branch road of the failure by determining to earth electric field, the confession with the failure determined by zero sequence small echo mode coefficient
Electric branch road is compared；
If any identical, then judge that the power supply branch road of the failure determined is the power supply branch road of failure；
If it is not the same, then judging that the power supply branch road of the failure determined is not necessarily the power supply branch road of failure.
6. a kind of device that singlephase earth fault is judged based on global wavelet coefficient counterbalanced procedure, it is characterised in that include：
Acquisition module, obtains earth fault line to be detected for synchronous, the zero-sequence current and three-phase current of each power supply branch road；
Conversion module, for carrying out wavelet transformation to the zero-sequence current and three-phase current of each power supply branch road, obtains each
The small echo mode coefficient of the zero sequence small echo mode coefficient of power supply branch road and each each phase of branch road of powering；
First determining module, for according to each power supply branch road zero sequence small echo mode coefficient maximum or absolute value maximum it
Between equilibrium relation, determine the power supply branch road of earth fault；
Second determining module, for the maximum of small echo mode coefficient maximum or absolute value according to each power supply branch road each phase
Between relation, determine it is out of order power supply branch road in failure phase.
7. device according to claim 6, it is characterised in that first determining module is specifically for will be in power supply branch road
The maximum of the maximum or absolute value of zero sequence small echo mode coefficient is approximately equal to other the power supply branch roads in addition to the power supply branch road
Zero sequence small echo mode coefficient maximum or absolute value maximum sum power supply branch road, be defined as the power supply branch road of failure.
8. device according to claim 6, it is characterised in that second determining module is specifically for will be in each power supply
The phase of the maximum of small echo mode coefficient maximum or absolute value in branch road, the small echo mode coefficient of each phase, is defined as the power supply of failure
Failure phase in road.
9. device according to claim 6, it is characterised in that also include：
Judge module, in the zero sequence small echo mode coefficient according to each power supply branch road, after determining the power supply branch road of failure, root
According to each power supply branch road in failure to earth electric field, judge that whether the power supply branch road of the failure determined is the power supply of failure
Road.
10. device according to claim 9, it is characterised in that the judge module includes：
First determining unit, for the power supply branch road that will be gone to zero to the earth electric field short time in each power supply branch road, as failure
Power supply branch road；
Comparing unit, for by the power supply branch road of the failure by determining to earth electric field, zero sequence small echo mode coefficient is true with passing through
The power supply branch road of the failure made is compared；
First identifying unit, for it is determined that in the case of identical, judging that the power supply branch road of the failure determined is the confession of failure
Electric branch road；
Second identifying unit, in the case of it is determined that differing, judging that the power supply branch road of the failure determined is not necessarily
The power supply branch road of failure.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387731A (en) * | 2018-12-21 | 2019-02-26 | 云南电网有限责任公司电力科学研究院 | A kind of high resistance earthing fault discrimination method based on wavelet analysis and amplitude com parison |
| CN110579672A (en) * | 2019-07-11 | 2019-12-17 | 国网江苏省电力有限公司徐州供电分公司 | Power transmission line fault detection system and method based on energy characteristic analysis |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798803A (en) * | 2012-08-15 | 2012-11-28 | 广东电网公司电力科学研究院 | Method for detecting line fault of power distribution network |
| CN102944817A (en) * | 2012-12-10 | 2013-02-27 | 辽宁省电力有限公司沈阳供电公司 | Locating method and device for one-phase earth fault of power distribution network based on transient state signal wavelet transformation |
| CN103197202A (en) * | 2013-03-29 | 2013-07-10 | 昆明理工大学 | Distribution network fault line selection method based on wavelet coefficient correlation analysis in three-phase breaking current component characteristic frequency band |
| CN103267927A (en) * | 2013-04-27 | 2013-08-28 | 昆明理工大学 | Small current grounding system fault line selection method using power frequency component wavelet coefficients to carry out linear fitting detection |
| CN203422438U (en) * | 2013-07-19 | 2014-02-05 | 国家电网公司 | Real-time monitoring and fault location system for overhead lines of power distribution network |
| CN106019046A (en) * | 2016-05-18 | 2016-10-12 | 成都理工大学 | Novel small-current grounding system transient line selection method |
| CN106093714A (en) * | 2016-08-26 | 2016-11-09 | 淄博博鸿电气有限公司 | The selection method of single-phase grounded malfunction in grounded system of low current circuit |
-
2016
- 2016-12-30 CN CN201611254981.8A patent/CN106597227A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798803A (en) * | 2012-08-15 | 2012-11-28 | 广东电网公司电力科学研究院 | Method for detecting line fault of power distribution network |
| CN102944817A (en) * | 2012-12-10 | 2013-02-27 | 辽宁省电力有限公司沈阳供电公司 | Locating method and device for one-phase earth fault of power distribution network based on transient state signal wavelet transformation |
| CN103197202A (en) * | 2013-03-29 | 2013-07-10 | 昆明理工大学 | Distribution network fault line selection method based on wavelet coefficient correlation analysis in three-phase breaking current component characteristic frequency band |
| CN103267927A (en) * | 2013-04-27 | 2013-08-28 | 昆明理工大学 | Small current grounding system fault line selection method using power frequency component wavelet coefficients to carry out linear fitting detection |
| CN203422438U (en) * | 2013-07-19 | 2014-02-05 | 国家电网公司 | Real-time monitoring and fault location system for overhead lines of power distribution network |
| CN106019046A (en) * | 2016-05-18 | 2016-10-12 | 成都理工大学 | Novel small-current grounding system transient line selection method |
| CN106093714A (en) * | 2016-08-26 | 2016-11-09 | 淄博博鸿电气有限公司 | The selection method of single-phase grounded malfunction in grounded system of low current circuit |
Non-Patent Citations (2)
| Title |
|---|
| 吴乐鹏 等: "基于暂态小波能量的小电流接地故障选线新方法", 《电力自动化设备》 * |
| *** 等: "基于小波变换的单相高阻接地故障选相元件研究", 《电力与电工》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387731A (en) * | 2018-12-21 | 2019-02-26 | 云南电网有限责任公司电力科学研究院 | A kind of high resistance earthing fault discrimination method based on wavelet analysis and amplitude com parison |
| CN109387731B (en) * | 2018-12-21 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | High-resistance grounding fault identification method based on wavelet analysis and amplitude comparison |
| CN110579672A (en) * | 2019-07-11 | 2019-12-17 | 国网江苏省电力有限公司徐州供电分公司 | Power transmission line fault detection system and method based on energy characteristic analysis |
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