CN110456229A - A kind of Single Terminal Traveling Wave Fault Location device of distribution line - Google Patents
A kind of Single Terminal Traveling Wave Fault Location device of distribution line Download PDFInfo
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- CN110456229A CN110456229A CN201910780881.6A CN201910780881A CN110456229A CN 110456229 A CN110456229 A CN 110456229A CN 201910780881 A CN201910780881 A CN 201910780881A CN 110456229 A CN110456229 A CN 110456229A
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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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The present invention provides a kind of Single Terminal Traveling Wave Fault Location devices of distribution line, distribution line for singlephase earth fault, it include: data collector, the measurement point position of distribution line is arranged in data collector, processor determines failure phase traveling wave and non-faulting phase traveling wave for carrying out Fault Phase Selection to reclosing three-phase traveling wave, phase-model transformation processing is carried out to failure phase traveling wave and non-faulting phase traveling wave, to obtain the line line that the line line wave of the phase containing failure is mutually constituted with non-faulting；According to the line line that the line line wave of the phase containing failure is mutually constituted with non-faulting, determines and be overlapped brake cable line wave in the superposition component of fault point；Determine the distance between fault point and the measurement point of distribution line.Fault location device of the invention does not need additionally to install injection device additional, and hardware investment is few, applied widely, and without acquiring regular link reclosing recorder data, small to power grid impact, has good practical performance and economic performance.
Description
Technical field
The present invention relates to technical field of power systems, fill in particular to a kind of Single Terminal Traveling Wave Fault Location of distribution line
It sets.
Background technique
Distribution line is directly connected with power consumer as power grid end, is the bridge between power grid and user, carries
The vital task that electric energy safe is reliably distributed to user terminal, according to the statistics of national grid, China's generated energy 85% with
On be all that user is conveyed to by power distribution network.Power distribution network is also the district occurred frequently of electric power system fault simultaneously, is shown according to investigation,
The power failure of 90% or more electric system is all due to caused by distribution line failure, and wherein the line is busy that road is total for single-phase grounding fault
85% or more of failure, while most singlephase earth faults are not metallic earthings, transition resistance can be single-ended to tradition
Power frequency distance measuring method produces bigger effect.
The development of China's power distribution network increasingly accelerates in recent years, and the scale of power distribution network also constantly expands, number of branches increase,
Line length increases, and power load sharply increases, so that power distribution network becomes to become increasingly complex.Compared with transmission line of electricity, distribution wire
Road has the characteristics that itself is exclusive, and the distribution line in China generally uses neutral non-effective grounding mode, i.e. neutral point does not connect
Ground or neutral point are through arc suppression coil or big resistance eutral grounding.Closed loop configuration open loop operation mode is used in structure, route operates normally
Shi Duowei radial structure, line length is short, and line sectionalizing is more, the presence of branch's load and cable, overhead line mixed connection route
A large amount of wave impedance discontinuity point can be generated.It is influenced by factors such as technology, cost, enforcement difficulties, distribution line is not adopted generally
It being replaced with space, this will lead to line parameter circuit value asymmetrical three-phase, meanwhile, the access of out-of-balance load and each phase institute on-load are not
Balance, this will lead to load asymmetrical three-phase again, so, distribution line is it is difficult to ensure that symmetry system having symmetry is run.Therefore, when failure is sent out
When raw, fast and accurately fault point, can not only eliminate failure in time and shorten power off time, and can save manpower object
Power suffers from highly important realistic meaning to safe and stable, the economical operation of distribution system.
In existing fault localization side, single-ended traveling wave method, which implements, to be relatively easy to, but the core of single-ended method needs to identify event
Hinder point reflection wave, and in distribution line, the presence of a large amount of wave impedance discontinuity poinies generates very big interference to Single Terminal Traveling Wave Fault Location,
Algorithm is caused to fail, distance measurement result error.Also, existing Single Terminal Traveling Wave Fault Location device needs additional installation injection device, also
The reclosing recorder data according to different situations is needed, the scope of application is low, high production cost.Therefore, a kind of use how is designed
Range is wide, and the travelling wave ranging dress not influenced by impedance discontinuity point, transition resistance, system operation mode and load variations
The problem of setting, being current urgent need to resolve.
Summary of the invention
The present invention is directed at least solve one of the technical problems existing in the prior art.
The present invention provides a kind of Single Terminal Traveling Wave Fault Location devices of distribution line.
In view of above-mentioned, according to the first aspect of the invention, distribution line is arranged in data collector, data collector
Measurement point position, measurement point at the time of for obtaining breaker three_phase reclosing, after acquiring the breaker three_phase reclosing moment
Reclosing three-phase traveling wave；Processor, processor are connected with data collector, for carrying out failure choosing to reclosing three-phase traveling wave
Phase determines failure phase traveling wave and non-faulting phase traveling wave；And it is revised by Karenbauer (card human relations Bauer) matrix to therefore
Hinder phase traveling wave and non-faulting phase traveling wave carries out phase-model transformation processing, is mutually constituted with obtaining the line line wave of the phase containing failure with non-faulting
Line line wave；And the line line mutually constituted according to the line line wave of the phase containing failure with non-faulting, it determines and is overlapped brake cable line
Superposition component of the wave in fault point；According to superposition component and breaker three_phase reclosing moment, the fault point of distribution line is determined
The distance between measurement point；Wherein, reclosing three-phase traveling wave includes three-phase voltage traveling wave or three-phase current traveling wave；Data transmission
Device, data transmission device are connected with processor, for the fault point distance to external equipment transmission distribution line.
In the technical scheme, a kind of Single Terminal Traveling Wave Fault Location dress of singlephase earth fault for distribution line is provided
It sets, comprising: data collector, processor and data transmission device, data collector are used to calculate processor required data
It is acquired, that is, acquires the breaker three_phase reclosing moment when singlephase earth fault occurs for distribution line, and acquire three-phase
The reclosing three-phase traveling wave of Reclosing Instant.Distribution line reclosing three-phase voltage or current traveling wave by be overlapped on the line etc.
It imitates power supply to generate, be coupled since route exists, three-phase line interacts in communication process.Therefore it needs first to reclosing three
Phase traveling wave carries out Fault Phase Selection, determines be out of order phase and non-faulting phase, then pass through revised Karenbauer (card human relations Bauer)
Three-phase decoupling is realized in transformation, thus obtain the line line wave of the phase containing failure and line line wave that non-faulting is mutually constituted, last basis
The line line wave of the phase containing failure determines that fault point is superimposed component with the line line wave that non-faulting is mutually constituted, according to obtained superposition
Component and collected three_phase reclosing moment calculate the accurate distance between fault point and measurement point.Distance measurement result is not by wave
The influence of impedance discontinuity point, transition resistance, system operation mode memory load variations, can accurately and effectively determine fault point
Position is applicable in voltage traveling wave and current traveling wave, applied widely, other situation reclosing recorder datas is not needed, to electricity
Net impact is small, has good practical performance and economic performance.
In the above-mentioned technical solutions, it is preferable that by revised Karenbauer (card human relations Bauer) matrix to failure phase
Traveling wave and non-faulting phase traveling wave carry out phase-model transformation processing, and processor is specifically used for, and determine revised Karenbauer (card human relations
Bauer) matrix；Non-symmetrical line is carried out to failure phase traveling wave and non-faulting phase traveling wave by revised Karenbauer matrix
The conversion of phase mould, to determine the line line wave that is mutually constituted with non-faulting of line line wave of the phase containing failure.
In the technical scheme, it in power distribution network, is influenced by factors such as cost, investment and difficulty of construction, distribution line
It does not generally take three-phase to replace, therefore line parameter circuit value asymmetrical three-phase, phase is carried out to reclosing three-phase traveling wave using phase-model transformation
When mould change process, need to be modified Karenbauer (card human relations Bauer) matrix, to realize non-symmetrical line three-phase solution
Coupling.
In the above-mentioned technical solutions, it is preferable that data transmission device is also used to: obtaining revised Karenbauer square
Battle array；Processor is specifically used for: obtaining wave impedance matrix；Correction matrix is obtained, and by correction matrix to Karenbauer (card human relations
Bauer) matrix is modified to obtain revised Karenbauer (card human relations Bauer) matrix；It is obtained by the following formula amendment
Karenbauer matrix afterwards:
S'ZS'-1=HSZS-1H-1=Zλ
Wherein, a, b, c are route three-phase, and Z is surge impedance of a line matrix, and H is correction matrix, and S' is revised
Karenbauer (card human relations Bauer) matrix, ZλFor revised surge impedance of a line matrix, ZλFor diagonal matrix, λαλβλ0Respectively α β
0 mould wave impedance.
In the technical scheme, if when route three-phase symmetrical, generally directly using Karenbauer (card human relations Bauer) change
Swap-in row phase-model transformation realizes and decouples to the three-phase of wave impedance matrix, but in line parameter circuit value asymmetrical three-phase, needs pair
Karenbauer (card human relations Bauer) matrix is modified.
In the above-mentioned technical solutions, it is preferable that obtain wave impedance matrix, processor is specifically used for: obtaining by following formula
Take surge impedance of a line matrix:
Wherein, Z is surge impedance of a line matrix element, and L is line inductance parameter, and C is line capacitance parameter.
In the technical scheme, it can be calculated by above-mentioned formula using the inductance parameters of route and the capacitance parameter of route
Obtain each element in surge impedance of a line matrix.
In the above-mentioned technical solutions, it is preferable that determine the line line that the line line wave of the phase containing failure is mutually constituted with non-faulting,
Processor is specifically used for: reclosing three-phase traveling wave is three-phase voltage traveling wave, by following formula by failure phase traveling wave and non-faulting
Phase traveling wave carries out the phase-model transformation processing of non-symmetrical line, by taking a phase ground fault as an example:
Reclosing three-phase traveling wave is three-phase current traveling wave, by following formula by failure phase traveling wave and non-faulting phase traveling wave into
The phase-model transformation of row non-symmetrical line is handled:
Wherein, a phase is failure phase, YαIndicate the line line wave of the phase containing failure, YγIndicate the line that non-faulting is mutually constituted
Line wave, UaIndicate a phase voltage traveling wave, that is, faulted phase voltage traveling wave, Ub、UcIt is i.e. described to respectively indicate b, c phase voltage traveling wave
Non-faulting phase voltage traveling wave, IaIndicate a phase current traveling wave, that is, faulted phase current traveling wave, Ib、IcRespectively indicate b, c phase current
Traveling wave, that is, non-faulting phase current traveling wave, ZaIndicate a phase from wave impedance, ZbIndicate b phase from wave impedance, ZcIndicate c phase from wave resistance
It is anti-, ZabIndicate the mutual wave impedance of ab, ZacIndicate the mutual wave impedance of ac, ZbcIndicate the mutual wave impedance of bc.
In the technical scheme, reclosing three-phase traveling wave can use three-phase voltage traveling wave or three-phase current traveling wave, lead to
It crosses the line line wave that different formula mutually constitutes the line line wave and non-faulting of the phase containing failure to calculate, electric system three
Mutually difference a phase, b phase, c phase, by taking a phase is grounded as an example, i.e., a phase is failure phase, and b, c phase are non-faulting phase, i.e. a phase voltage traveling wave is
Faulted phase voltage traveling wave, b, c phase voltage traveling wave be non-faulting phase voltage traveling wave, a phase current traveling wave be faulted phase current traveling wave, b,
C phase current traveling wave determines the line mould of failure phase by three-phase voltage traveling wave or three-phase current traveling wave for non-faulting phase current traveling wave
The line line wave that traveling wave is mutually constituted with non-faulting realizes and is converted according to different formulas to the unified of different type traveling wave, makes event
Barrier point distance measuring method applicability is stronger.
In the above-mentioned technical solutions, it is preferable that the line line mutually constituted according to the line line wave of the phase containing failure with non-faulting
Wave determines and is overlapped brake cable line wave the superposition component of fault point the step of, and processor is specifically used for: respectively to the phase containing failure
Line line wave is normalized with the line line wave that non-faulting is mutually constituted；Contain failure to after normalization by following formula
The line line wave of phase is calculated with the line line wave that non-faulting is mutually constituted, and is overlapped brake cable line wave in the folded of fault point to determine
Bonus point amount:
Wherein,Indicate it is described coincidence brake cable line wave fault point superposition component,After indicating the normalization
The line line wave of the phase containing failure,The line line wave that non-faulting after indicating the normalization is mutually constituted.
In the technical scheme, according to the non-faulting phase structure after the line line wave of the phase containing failure after normalization and normalization
At line line wave can construct and be overlapped brake cable line wave only in the superposition component of fault point, therefore and according to principle of stacking
When carrying out fault point ranging, without acquiring regular link reclosing recorder data, it is not required to data storage, alignment of data, is reduced
Combined floodgate impact to power grid.
In the above-mentioned technical solutions, it is preferable that the line mould that the line line wave of the phase containing failure is mutually constituted with non-faulting respectively
Traveling wave is normalized, and processor is specifically used for: by following formula to the line line wave and non-faulting phase of the phase containing failure
The line line wave of composition is normalized:
Wherein,The line line wave of the phase containing failure after indicating normalization,Non-faulting after indicating normalization is mutually constituted
Line line wave, YαIndicate the line line wave of the phase containing failure, MαIndicate the first modulus maximum of the line line wave of the phase containing failure, Yγ
Indicate the line line wave that non-faulting is mutually constituted, MγIndicate the first modulus maximum for the line line wave that non-faulting is mutually constituted.
In the technical scheme, using wavelet transformation modulus maximum, first modulus maximum and its out current moment are determined, then
It is normalized according to line line wave of the first modulus maximum to the phase containing failure with non-faulting phase line line wave, according to returning
The line line wave that the one line line wave for changing treated the phase containing failure is mutually constituted with non-faulting obtains only faults point information
It is superimposed component.
In the above-mentioned technical solutions, it is preferable that processor is specifically used for: it is calculated by the following formula modulus maximum:
Wherein,Indicate the modulus maximum of the wavelet transformation of jth scale,Indicate the kth in current layer
The Wavelet Component of the jth scale of point data；It is calculated by the following formula Wavelet Component:
Wherein, f (n) indicates the line line wave that the line line wave of the phase containing failure is mutually constituted with non-faulting,Indicate jth
The approximation component of scale,Indicating the Wavelet Component of jth scale, h (k), g (k) respectively indicate corresponding filter parameter,
ηjIndicate the construction coefficient of j scale.
In the technical scheme, it is converted by adjusting filter parameter and multi-level Wavelet Transform, can reduce distribution line list
The error of travelling wave ranging is held, guarantees the accuracy of fault point ranging.
In the above-mentioned technical solutions, it is preferable that calculated according to superposition component with Reclosing Instant, to obtain fault point
The distance between measurement point, processor is specifically used for: the distance between fault point and measurement point are determined by following formula:
Wherein, x indicates the distance between fault point and measurement point, t1Indicate Reclosing Instant, t2It indicates to be overlapped brake cable line
The arrival time of wave i.e. first fault point back wave at the time of first modulus maximum of the superposition component of fault point corresponds to, v
Indicate the line mould wave velocity of reclosing traveling wave.
In the technical scheme, the first of component is superimposed fault point according to Reclosing Instant, coincidence brake cable line wave
At the time of modulus maximum corresponds to and the line mould wave velocity of three-phase voltage traveling wave or three-phase current traveling wave, pass through formula calculate determine therefore
The distance between barrier point and measurement point, to be quickly and accurately positioned fault point, mitigate line walking burden, are conducive to acceleration disturbance inspection
It repairs and restores electricity, reduce the loss of power failure bring, fault localization does not need additionally to install injection device additional, and hardware investment is few, right
Voltage traveling wave and current traveling wave are applicable in, applied widely, and without acquiring regular link reclosing recorder data, to power grid
Impact it is small, have good practical performance and economic performance.
In the above-mentioned technical solutions, it is preferable that data storage device, data storage device are connected with processor, for pair
The distance between the fault point that detection obtains and measurement point are stored；Power supply unit, power supply unit and data collector, processing
Device, data transmission device are connected with data storage device, for data collector, processor, data transmission device and data
Storage device power supply.
In the technical scheme, data storage device can store the data that data transmission device transfers out,
Correction matrix and Karenbauer (card human relations Bauer) matrix can also be stored, also needed again when avoiding the need for identical data
It is secondary to carry out transmission acquisition, effectively simplify detecting step, and loss of data can be prevented, power supply unit be range unit it is whole into
Row power supply.
Detailed description of the invention
Fig. 1 shows the structural block diagram of Single Terminal Traveling Wave Fault Location device according to an embodiment of the invention；
Fig. 2 shows typical power distribution network schematic diagrames according to an embodiment of the invention；
Fig. 3 shows the line mould network diagram of the phase according to an embodiment of the invention containing failure；
Fig. 4 shows the line mould network diagram that non-faulting according to an embodiment of the invention is mutually constituted；
Fig. 5 shows superposition component network schematic diagram in fault point according to an embodiment of the invention.
Wherein, the appended drawing reference in Fig. 1 and the corresponding relationship between component names are as follows:
100 Single Terminal Traveling Wave Fault Location devices, 110 data collectors, 120 processors, 130 data transmission devices, 140 data are deposited
Storage device, 150 power supply units.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
Implement in a manner of using other than the one described here, therefore, protection scope of the present invention is not by following public tool
The limitation of body embodiment.
Referring to Fig. 1, one embodiment of the present of invention, proposes a kind of Single Terminal Traveling Wave Fault Location device 100 of distribution line,
Distribution line suitable for singlephase earth fault, wherein the device includes: data collector 110, and data collector 110 is arranged
In the measurement point position of distribution line, at the time of for obtaining breaker three_phase reclosing, when acquiring breaker three_phase reclosing
The reclosing three-phase traveling wave of measurement point after quarter；Processor 120, processor 120 are connected with data collector 110, are used for counterweight
Combined floodgate three-phase traveling wave carries out Fault Phase Selection, determines failure phase traveling wave and non-faulting phase traveling wave；And by revised
Karenbauer (card human relations Bauer) matrix carries out phase-model transformation processing to failure phase traveling wave and non-faulting phase traveling wave, to obtain containing event
The line line that the line line wave of barrier phase is mutually constituted with non-faulting；And it is mutually constituted according to the line line wave of the phase containing failure with non-faulting
Line line, determine be overlapped brake cable line wave fault point superposition component；According to superposition component and breaker three_phase reclosing
Moment determines the distance between fault point and measurement point of distribution line；Wherein, reclosing three-phase traveling wave includes three-phase voltage row
Wave or three-phase current traveling wave；Data transmission device 130, data transmission device 130 are connected with processor 120, for setting to external
The fault point distance of standby transmission distribution line.
In this embodiment, distribution line network as shown in Figure 2 is typical distribution line, distribution line and power transmission line
Road is compared, and there are following characteristics for distribution wire: there are a large amount of wave impedance discontinuity poinies for distribution line, in traveling wave detection process, meeting
The catadioptric generation of traveling wave is interfered, and distribution line parameter unbalance, the general non complete symmetry of institute's on-load, n in Fig. 41、
n2、n3、n4Represent each branched line in distribution line, L1、L2、L3、L4、LnRepresent distribution line institute on-load.
A kind of Single Terminal Traveling Wave Fault Location device 100 of singlephase earth fault for distribution line is present embodiments provided, is wrapped
Include: data collector 110, processor 120 and data transmission device 130, data collector 110 are used to calculate processor 120
Required data are acquired, that is, acquire the breaker three_phase reclosing moment when singlephase earth fault occurs for distribution line,
And acquire the reclosing three-phase traveling wave at three_phase reclosing moment.Distribution line reclosing three-phase voltage or current traveling wave are by being overlapped
Equivalent source on route generates, and couples since route exists, three-phase line interacts in communication process.Therefore elder generation is needed
Fault Phase Selection is carried out to reclosing three-phase traveling wave, determines be out of order phase and non-faulting phase, then pass through revised Karenbauer
Three-phase decoupling is realized in (card human relations Bauer) transformation, thus the line line that the line line wave for obtaining the phase containing failure is mutually constituted with non-faulting
Wave, the last line line wave according to the phase containing failure and the line line wave that non-faulting is mutually constituted determine that fault point is superimposed component, according to
Obtained superposition component and collected three_phase reclosing moment calculate the accurate distance between fault point and measurement point.It surveys
It is not influenced by wave impedance discontinuity point, transition resistance, system operation mode memory load variations away from result, it can be with accurate and effective
Determination position of failure point, voltage traveling wave and current traveling wave are applicable in, it is applied widely, do not need the record of other situation reclosings
Wave number evidence, it is small to power grid impact, there is good practical performance and economic performance.
Specifically, as shown in Figure 3 and Figure 4, due to including fault point in the line lay wire network of the phase containing failure to ground leg, so
The propagation of its line line wave is influenced by fault point, and without fault point to ground leg, institute in the line lay wire network that non-faulting is mutually constituted
It is not influenced by fault point with the propagation of its line line wave.
Referring to Fig. 1, one embodiment of the present of invention, proposes a kind of Single Terminal Traveling Wave Fault Location device 100 of distribution line,
Suitable for the distribution line of singlephase earth fault, by revised Karenbauer (card human relations Bauer) matrix to failure phase traveling wave
Phase-model transformation processing is carried out with non-faulting phase traveling wave, processor 120 is specifically used for, and determines revised Karenbauer (card human relations
Bauer) matrix；Failure phase traveling wave and non-faulting phase traveling wave are carried out by revised Karenbauer (card human relations Bauer) matrix
The conversion of non-symmetrical line phase mould, the line line mutually constituted with the line line wave of the determining phase containing failure with non-faulting；According to containing failure
The line line that the line line wave of phase is mutually constituted with non-faulting obtains being overlapped brake cable line wave in the superposition component of fault point.
In this embodiment, it in power distribution network, is influenced by factors such as cost, investment and difficulty of construction, distribution line one
As do not take three-phase to replace, therefore line parameter circuit value asymmetrical three-phase carries out phase mould to reclosing three-phase traveling wave using phase-model transformation
It when change process, needs to be modified Karenbauer (card human relations Bauer) matrix, to realize that non-symmetrical line three-phase decouples.
Referring to Fig. 1, one embodiment of the present of invention, proposes a kind of Single Terminal Traveling Wave Fault Location device 100 of distribution line,
Suitable for the distribution line of singlephase earth fault, processor 120 is also used to: determining revised Karenbauer (card human relations Bauer)
Matrix, processor 120 are specifically used for: obtaining correction matrix, and by correction matrix to Karenbauer (card human relations Bauer) matrix
It is modified to obtain revised Karenbauer (card human relations Bauer) matrix；It is obtained by the following formula revised
Karenbauer matrix:
S'ZS'-1=HSZS-1H-1=Zλ
Wherein, a, b, c are route three-phase, and Z is surge impedance of a line matrix, and H is correction matrix, and S' is revised
Karenbauer (card human relations Bauer) matrix, ZλFor revised surge impedance of a line matrix, ZλFor diagonal matrix, λαλβλ0Respectively α β
0 mould wave impedance.
In this embodiment, if when route three-phase symmetrical, generally directly using Karenbauer (card human relations Bauer) transformation
Phase-model transformation is carried out, realizes and the three-phase of wave impedance matrix is decoupled, but in line parameter circuit value asymmetrical three-phase, is needed pair
Karenbauer (card human relations Bauer) matrix is modified.
Referring to Fig. 1, one embodiment of the present of invention, proposes a kind of Single Terminal Traveling Wave Fault Location device 100 of distribution line,
Suitable for the distribution line of singlephase earth fault, wave impedance matrix is obtained, processor 120 is specifically used for: obtaining by following formula
Take surge impedance of a line matrix:
Wherein, Z is surge impedance of a line matrix element, and L is line inductance parameter, and C is line capacitance parameter.
In this embodiment, it can be calculated by above-mentioned formula using the inductance parameters of route and the capacitance parameter of route
Each element in surge impedance of a line matrix out.
Referring to Fig. 1, one embodiment of the present of invention, proposes a kind of Single Terminal Traveling Wave Fault Location device 100 of distribution line,
Suitable for the distribution line of singlephase earth fault, the line line that the line line wave of the phase containing failure is mutually constituted with non-faulting is determined, place
Reason device 120 is specifically used for: reclosing three-phase traveling wave is three-phase voltage traveling wave, by following formula by failure phase traveling wave and non-faulting
Phase traveling wave carries out the phase-model transformation processing of non-symmetrical line, by taking a phase ground fault as an example:
Reclosing three-phase traveling wave is three-phase current traveling wave, by following formula by failure phase traveling wave and non-faulting phase traveling wave into
The phase-model transformation of row non-symmetrical line is handled:
Wherein, a phase is failure phase, YαIndicate the line line wave of the phase containing failure, YγIndicate the line that non-faulting is mutually constituted
Line wave, UaIndicate a phase voltage traveling wave, that is, faulted phase voltage traveling wave, Ub、UcIt is i.e. described to respectively indicate b, c phase voltage traveling wave
Non-faulting phase voltage traveling wave, YαIndicate the line line wave of the phase containing failure, YγIndicate the line line wave that non-faulting is mutually constituted, Ia
Indicate a phase current traveling wave, that is, faulted phase current traveling wave, Ib、IcRespectively indicate the i.e. described non-faulting of b, c phase current traveling wave mutually electricity
Popular wave, ZaIndicate a phase from wave impedance, ZbIndicate b phase from wave impedance, ZcIndicate c phase from wave impedance, ZabIndicate the mutual wave resistance of ab
It is anti-, ZacIndicate the mutual wave impedance of ac, ZbcIndicate the mutual wave impedance of bc.
In this embodiment, reclosing three-phase traveling wave can use three-phase voltage traveling wave or three-phase current traveling wave, pass through
The line line wave that different formula mutually constitutes the line line wave and non-faulting of the phase containing failure calculates, Three-phase Power Systems
A phase, b phase, c phase respectively, by taking a phase is grounded as an example, i.e., a phase is failure phase, and b, c phase are non-faulting phase, i.e., a phase voltage traveling wave is event
Hinder phase voltage traveling wave, b, c phase voltage traveling wave are non-faulting phase voltage traveling wave, and a phase current traveling wave is faulted phase current traveling wave, b, c
Phase current traveling wave determines the line mould of failure phase by three-phase voltage traveling wave or three-phase current traveling wave for non-faulting phase current traveling wave
The line line wave that traveling wave is mutually constituted with non-faulting realizes and is converted according to different formulas to the unified of different type traveling wave, makes event
Barrier point distance measuring method applicability is stronger.
Referring to Fig. 1, one embodiment of the present of invention, proposes a kind of Single Terminal Traveling Wave Fault Location device 100 of distribution line,
Suitable for the distribution line of singlephase earth fault, according to the line line that the line line wave of the phase containing failure is mutually constituted with non-faulting, really
Surely brake cable line wave is overlapped the superposition component of fault point the step of, and processor 120 is specifically used for: respectively to the line of the phase containing failure
Line wave is normalized with the line line wave that non-faulting is mutually constituted；
The line line wave that the line line wave of the phase containing failure after normalization and non-faulting are mutually made up of following formula into
Row calculates, and is overlapped brake cable line wave in the superposition component of fault point to determine:
Wherein,Indicate it is described coincidence brake cable line wave fault point superposition component,After indicating the normalization
The line line wave of the phase containing failure,The line line wave that non-faulting after indicating the normalization is mutually constituted.
In this embodiment, it is mutually constituted according to the line line wave of the phase containing failure after normalization with the non-faulting after normalization
Line line wave can construct and be overlapped brake cable line wave only in the superposition component of fault point and according to principle of stacking, therefore
When carrying out fault point ranging, without acquiring regular link reclosing recorder data, it is not required to data storage, alignment of data, reduction pair
The combined floodgate of power grid impacts.
Referring to Fig. 1, one embodiment of the present of invention, proposes a kind of Single Terminal Traveling Wave Fault Location device 100 of distribution line,
Suitable for the distribution line of singlephase earth fault, the line line wave of the phase containing failure is mutually constituted with non-faulting respectively line line wave
It is normalized, processor 120 is specifically used for: place is normalized by line line wave of the following formula to the phase containing failure
Reason:
Wherein,The line line wave of the phase containing failure after indicating normalization,Non-faulting after indicating normalization is mutually constituted
Line line wave, YαIndicate the line line wave of the phase containing failure, MαIndicate the first modulus maximum of the line line wave of the phase containing failure, Yγ
Indicate the line line wave that non-faulting is mutually constituted, MγIndicate the first modulus maximum for the line line wave that non-faulting is mutually constituted.
In this embodiment, using wavelet transformation modulus maximum, first modulus maximum and its current moment, then root out are determined
It is normalized according to line line wave of the first modulus maximum to the phase containing failure with non-faulting phase line line wave, according to normalizing
Change the line line wave that the line line wave of treated the phase containing failure is mutually constituted with non-faulting, obtains the folded of only faults point information
Bonus point amount.
Referring to Fig. 1, one embodiment of the present of invention, proposes a kind of Single Terminal Traveling Wave Fault Location device 100 of distribution line,
Suitable for the distribution line of singlephase earth fault, processor 120 is specifically used for: it is calculated by the following formula modulus maximum:
Wherein,Indicate the modulus maximum of the wavelet transformation of jth scale,Indicate the kth in current layer
The Wavelet Component of the jth scale of point data；It is calculated by the following formula Wavelet Component:
Wherein, f (n) indicates the line line wave that the line line wave of the phase containing failure is mutually constituted with non-faulting,Indicate jth
The approximation component of scale,Indicate the Wavelet Component of jth scale, h (k), g (k) respectively indicate corresponding filter ginseng
Number, ηjIndicate the construction coefficient of j scale.
In this embodiment, it is converted by adjusting filter parameter and multi-level Wavelet Transform, it is single-ended to can reduce distribution line
The error of travelling wave ranging guarantees the accuracy of fault point ranging.
Referring to Fig. 1, one embodiment of the present of invention, proposes a kind of Single Terminal Traveling Wave Fault Location device 100 of distribution line,
Suitable for the distribution line of singlephase earth fault, calculated according to superposition component with Reclosing Instant, with obtain fault point and
The distance between measurement point, processor 120 are specifically used for:
The distance between fault point and measurement point are determined by following formula:
Wherein, x indicates the distance between fault point and measurement point, t1Indicate Reclosing Instant, t2It indicates to be overlapped brake cable line
The arrival time of wave i.e. first fault point back wave at the time of first modulus maximum of the superposition component of fault point corresponds to, v
Indicate the line mould wave velocity of reclosing traveling wave.
In this embodiment, according to Reclosing Instant, be overlapped brake cable line wave fault point superposition component first mould
At the time of maximum corresponds to and the line mould wave velocity of three-phase voltage traveling wave or three-phase current traveling wave, passes through formula and calculate and determine failure
The distance between point and measurement point mitigate line walking burden to be quickly and accurately positioned fault point, are conducive to acceleration disturbance maintenance
With restore electricity, reduce the loss of power failure bring, fault localization do not need additionally to install injection device additional, and hardware investment is few, to electricity
Traveling wave and current traveling wave is pressed to be applicable in, it is applied widely, and without acquiring regular link reclosing recorder data, power grid is rushed
Hit it is small, have good practical performance and economic performance.Wherein, superposition component network in fault point is as shown in Figure 5.
Referring to Fig. 1, one embodiment of the present of invention, proposes a kind of Single Terminal Traveling Wave Fault Location device 100 of distribution line,
Distribution line suitable for singlephase earth fault, further includes: data storage device 140, data storage device 140 and processor
120 are connected, and the distance between the fault point for obtaining to detection and measurement point store；Power supply unit 150, power supply unit
150 are connected with data collector 110, processor 120, data transmission device 130 and data storage device 140, for data
Collector 110, processor 120, data transmission device 130 and data storage device 140 are powered.
In this embodiment, the data that data storage device 140 can transfer out data transmission device 130 are deposited
Storage, can also store correction matrix and Karenbauer (card human relations Bauer) matrix, avoid the need for also needing when identical data
Transmission acquisition is carried out again, effectively simplifies detecting step, and can prevent loss of data, and power supply unit 150 is single-ended row
Wave ranging device 100 is whole to be powered.
In the description of this specification, term " first ", " second " are only used for the purpose of description, and should not be understood as indicating
Or imply relative importance, unless otherwise clearly defined and limited；Term " connection ", " installation ", " fixation " etc. should all be done extensively
Reason and good sense solution, for example, " connection " may be fixed connection or may be dismantle connection, or integral connection；It can be direct phase
It even, can also be indirectly connected through an intermediary.For the ordinary skill in the art, it can manage as the case may be
Solve the concrete meaning of above-mentioned term in the present invention.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one reality of the invention
It applies in example or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or reality
Example.Moreover, description particular features, structures, materials, or characteristics can in any one or more of the embodiments or examples with
Suitable mode combines.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of Single Terminal Traveling Wave Fault Location device of distribution line, the distribution line for singlephase earth fault, which is characterized in that packet
It includes:
Data collector, the measurement point position of the distribution line is arranged in the data collector, for obtaining breaker three
It coincides the lock moment, acquires the reclosing three-phase traveling wave of the breaker；
Processor, the processor are connected with the data collector, for carrying out failure choosing to the reclosing three-phase traveling wave
Phase determines failure phase traveling wave and non-faulting phase traveling wave；And
Non-symmetric line is carried out to the failure phase traveling wave and the non-faulting phase traveling wave by revised Karenbauer matrix
The phase-model transformation on road is handled, to obtain the line line wave that the line line wave of the phase containing failure is mutually constituted with non-faulting；And
According to the line line wave that the line line wave of the phase containing failure is mutually constituted with the non-faulting, determines and be overlapped brake cable line wave
Superposition component in fault point；
Superposition component and the breaker three_phase reclosing moment according to the coincidence brake cable line wave in fault point, determine institute
State the fault point and the distance between the measurement point of distribution line；
Wherein, the reclosing three-phase traveling wave includes three-phase voltage traveling wave or three-phase current traveling wave；
Data transmission device, the data transmission device are connected with the processor, for transmitting the distribution to external equipment
The fault point distance of route.
2. the Single Terminal Traveling Wave Fault Location device of distribution line according to claim 1, which is characterized in that mutually go to the failure
Wave and non-faulting phase traveling wave carry out phase-model transformation processing and specifically include:
Obtain revised Karenbauer matrix；
It is not right to be carried out by the revised Karenbauer matrix to the failure phase traveling wave and the non-faulting phase traveling wave
Claim the phase mould conversion of route, the line line wave mutually constituted with the line line wave of the determining phase containing failure with the non-faulting.
3. the Single Terminal Traveling Wave Fault Location device of distribution line according to claim 2, which is characterized in that after the acquisition amendment
Karenbauer matrix the step of, the data transmission device is also used to:
Obtain wave impedance matrix；
The correction matrix is obtained, and by the correction matrix Karenbauer matrix is modified revised to obtain
Karenbauer matrix；
The processor is specifically used for:
It is obtained by the following formula revised Karenbauer matrix:
S'ZS'-1=HSZS-1H-1=Zλ
Wherein, a, b, c are route three-phase, and Z is surge impedance of a line matrix, and H is correction matrix, and S' is revised Karenbauer
Matrix, ZλFor revised surge impedance of a line matrix, ZλFor diagonal matrix, λαλβλ0Respectively 0 mould wave impedance of α β.
4. the Single Terminal Traveling Wave Fault Location device of distribution line according to claim 3, which is characterized in that obtain wave impedance matrix
The step of, comprising:
It is obtained by the following formula the surge impedance of a line matrix:
Wherein, Z is surge impedance of a line matrix element, and L is line inductance parameter, and C is line capacitance parameter.
5. the Single Terminal Traveling Wave Fault Location device of distribution line according to any one of claim 1 to 4, which is characterized in that really
The line line wave that the line line wave of the fixed phase containing failure is mutually constituted with the non-faulting, the processor are specifically used for:
The reclosing three-phase traveling wave is three-phase voltage traveling wave, by following formula by the failure phase traveling wave and the non-faulting
Phase traveling wave fault phase traveling wave non-faulting phase traveling wave carries out the phase-model transformation processing of non-symmetrical line:
The reclosing three-phase traveling wave is three-phase current traveling wave, by following formula by the failure phase traveling wave and the non-faulting
Phase traveling wave carries out the phase-model transformation processing of non-symmetrical line:
Wherein, a phase is failure phase, YαIndicate the line line wave of the phase containing failure, YγIndicate the line line that non-faulting is mutually constituted
Wave, UaIndicate a phase voltage traveling wave, that is, faulted phase voltage traveling wave, Ub、UcRespectively indicate the i.e. described non-event of b, c phase voltage traveling wave
Hinder phase voltage traveling wave, IaIndicate a phase current traveling wave, that is, faulted phase current traveling wave, Ib、IcRespectively indicate b, c phase current traveling wave
The i.e. described non-faulting phase current traveling wave, ZaIndicate a phase from wave impedance, ZbIndicate b phase from wave impedance, ZcIndicate c phase from wave impedance,
ZabIndicate the mutual wave impedance of ab, ZacIndicate the mutual wave impedance of ac, ZbcIndicate the mutual wave impedance of bc.
6. the Single Terminal Traveling Wave Fault Location device of distribution line according to claim 1, which is characterized in that contain failure according to described
The line line wave that the line line wave of phase is mutually constituted with the non-faulting determines the coincidence brake cable line wave in the superposition of fault point
The step of component, the processor are specifically used for:
The line line wave of the phase containing failure is normalized with the line line wave that the non-faulting is mutually constituted respectively；
It is counted by line line wave of the following formula to the phase containing failure after normalization with the line line wave that non-faulting is mutually constituted
It calculates, with the determination brake cable line wave that is overlapped in the superposition component of fault point:
Wherein,Indicate it is described coincidence brake cable line wave fault point superposition component,Contain event after indicating the normalization
Hinder the line line wave of phase,The line line wave that non-faulting after indicating the normalization is mutually constituted.
7. the Single Terminal Traveling Wave Fault Location device of distribution line according to claim 6, which is characterized in that respectively to described containing event
The line line wave of barrier phase is normalized with the line line wave that non-faulting is mutually constituted, and the processor is specifically used for:
It is normalized by line line wave of the following formula to the phase containing failure:
Wherein,The line line wave of the phase containing failure after indicating the normalization,Non-faulting phase after indicating the normalization
The line line wave of composition, YαIndicate the line line wave of the phase containing failure, MαIndicate the first of the line line wave of the phase containing failure
Modulus maximum, YγIndicate the line line wave that the non-faulting is mutually constituted, MγIndicate the line line wave that the non-faulting is mutually constituted
First modulus maximum.
8. the Single Terminal Traveling Wave Fault Location device of distribution line according to claim 7, which is characterized in that the processing implement body
For:
It is calculated by the following formula the modulus maximum:
Wherein,Indicate the modulus maximum of the wavelet transformation of jth scale,Indicate the kth point data in current layer
Jth scale Wavelet Component；
It is calculated by the following formula the Wavelet Component:
Wherein, f (n) indicates the line line wave that the line line wave of the phase containing failure is mutually constituted with the non-faulting,It indicates
The approximation component of jth scale,Indicate the Wavelet Component of jth scale, h (k), g (k) respectively indicate corresponding filter ginseng
Number, ηjIndicate the construction coefficient of j scale.
9. the Single Terminal Traveling Wave Fault Location device of the distribution line according to any one of claim 6 to 8, which is characterized in that root
It is calculated according to the superposition component with the Reclosing Instant, to obtain the distance between the fault point and measurement point, institute
Processor is stated to be specifically used for:
The distance between the fault point and the measurement point are determined by following formula:
Wherein, x indicates the distance between the fault point and the measurement point, t1Indicate the Reclosing Instant, t2Described in expression
It is overlapped brake cable line wave i.e. first fault point back wave at the time of first modulus maximum of the superposition component of fault point corresponds to
Arrival time, v indicate reclosing traveling wave line mould wave velocity.
10. the Single Terminal Traveling Wave Fault Location device of distribution line according to claim 9, which is characterized in that further include:
Data storage device, the data storage device are connected with the processor, the fault point for obtaining to detection
The distance between described measurement point is stored；
Power supply unit, the power supply unit and the data collector, the processor, the data transmission device and the number
It is connected according to storage device, for being stored to the data collector, the processor, the data transmission device and the data
Device power supply.
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