CN110456226A - A kind of fault localization system of transmission line of electricity - Google Patents
A kind of fault localization system of transmission line of electricity Download PDFInfo
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- CN110456226A CN110456226A CN201910779752.5A CN201910779752A CN110456226A CN 110456226 A CN110456226 A CN 110456226A CN 201910779752 A CN201910779752 A CN 201910779752A CN 110456226 A CN110456226 A CN 110456226A
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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
Abstract
The invention proposes a kind of fault localization systems of transmission line of electricity, comprising: wave recording device, positioned at the measurement point of transmission line of electricity, for acquiring reclosing three-phase voltage traveling wave or three-phase current traveling wave；Processor is connect with wave recording device, for constructing the line line wave that the line line wave of the phase containing failure is mutually constituted with non-faulting according to three-phase voltage traveling wave or three-phase current traveling wave；And the line line wave mutually constituted according to the line line wave of the phase containing failure with non-faulting, it determines and is overlapped brake cable line wave in the superposition component of fault point；And according to brake cable line wave is overlapped in the superposition component and Reclosing Instant of fault point, determine the distance between fault point and measurement point；Display device is connect with processor, for showing the fault point distance of transmission line of electricity.System through the invention can be quickly and accurately positioned fault point, mitigate line walking burden, and fault localization result is not influenced by line branch point, transition resistance, system operation mode variation and load.
Description
Technical field
The present invention relates to technical field of power systems, in particular to a kind of fault localization system of transmission line of electricity.
Background technique
Ultra-high-tension power transmission line is the important component of electric system, is responsible for the vital task of conveying electric energy, meanwhile, it is high
Pressure transmission line is also the multiple position of electric network fault, and in recent years, ultra-high-tension power transmission line failure is electrically set electric system is various
Shared ratio increases in standby.Since line corridor situation is complicated, ultra-high-tension power transmission line needs to often pass through farmland, forest, mountain
The band off the beaten track such as area, after failure, the difficulty of artificial line walking and breakdown repair is big.So when an error occurs, it is fast and accurately fixed
Position fault point, can not only eliminate in time failure shorten power off time, effectively reduce economic loss caused by due to power failure and
It can reduce line walking burden, use manpower and material resources sparingly, there is very positive work to the safe and economical operation of entire electric system
With.
The fault type of ultra-high-tension power transmission line is divided into four kinds, is single-phase grounding fault, two-phase short-circuit fault, two respectively
Phase ground short circuit failure and three phase short circuit fault.According to operating experience and calendar year statistics, in all kinds of short circuits that transmission line of electricity occurs
In failure, the line is busy 80% or more of road total failare for single-phase grounding fault, and two-phase short-circuit fault and two-phase grounding fault therefore
Barrier only accounts for the 3%-5% of failure sum, and three phase short circuit fault proportion is then less than 1%.From the above statistics as can be seen that ground connection
Failure proportion highest.Scene generallys use single-ended impedance method and carries out fault localization at present, but since it is merely with single-ended
Power frequency quality can not overcome influence of the transition resistance to distance measurement result from principle.Both-end impedance rule can utilize both-end
Electrical quantity synchronizes data and wants although overcoming the problem of single-ended impedance method is influenced by transition resistance and system operation mode
Ask high, hardware device investment is big.
In conclusion when transmission line of electricity occur it is single-phase connect road failure after, such as why not by line branch point, transition resistance, be
The influence of changes of operating modes of uniting and load, is quickly and accurately positioned fault point, while avoiding hardware investment cost excessively high, is existing
The urgent need to resolve the problem of.
Summary of the invention
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
For this purpose, the invention proposes a kind of fault localization systems of transmission line of electricity.
In view of this, proposing a kind of fault localization system of transmission line of electricity, it is suitable for transmission line of electricity and single-phase fault occurs
Reclosing device carries out reclosing afterwards characterized by comprising wave recording device, positioned at the measurement point of transmission line of electricity, for acquiring
Reclosing three-phase voltage traveling wave or three-phase current traveling wave；Processor is connect with wave recording device, for according to three-phase voltage traveling wave or
Three-phase current traveling wave, the line line wave that the line line wave of construction phase containing failure is mutually constituted with non-faulting；And according to construction containing event
The line line wave that the line line wave of barrier phase is mutually constituted with non-faulting determines and is overlapped brake cable line wave in the superposition component of fault point；
And it according to brake cable line wave is overlapped in the superposition component and Reclosing Instant of fault point, determines between fault point and measurement point
Distance；Display device is connect with processor, for showing the fault point distance of transmission line of electricity.
The fault localization system of transmission line of electricity provided by the invention, when single-phase fault occurs for transmission line of electricity, reclosing dress
Reclosing operation can be executed automatically by setting, and after reclosing device carries out reclosing, acquired and be overlapped by wave recording device in measurement point
Lock three-phase voltage traveling wave or three-phase current traveling wave, processor generate according to three-phase voltage traveling wave or three-phase current traveling wave and contain failure
The line line wave that the line line wave of phase is mutually constituted with non-faulting, and determine be overlapped brake cable line wave fault point superposition component,
Further according to be overlapped brake cable line wave fault point superposition component and Reclosing Instant, determine between fault point and measurement point away from
From, and fault point distance data are shown by display device.By above-mentioned fault localization system, can rapidly and accurately obtain defeated
Electric line singlephase earth fault distance mitigates line walking burden, uses manpower and material resources sparingly, and is conducive to acceleration disturbance maintenance and restores to supply
Electricity reduces the loss of power failure bring, and fault localization result is not changed by line branch point, transition resistance, system operation mode
And the influence of load, it can accurately determine position of failure point.Meanwhile fault localization does not need additionally to install injection device, hardware additional
Small investment is applicable in voltage traveling wave and current traveling wave, applied widely, and not need regular link single-phase for ranging process
It is overlapped recorder data, it is small to power grid impact, be conducive to promote range-measurement system stability and reliability.
In addition, the fault localization system of the transmission line of electricity in the above-mentioned technical proposal provided according to the present invention, can also have
There is following additional technical feature:
In the above-mentioned technical solutions, it is preferable that further include: power supply, for being provided for the fault localization system of transmission line of electricity
Electric energy；Suggestion device is connect with processor, for sending the distance between fault point and measurement point by short message；Filter,
It is connect with processor, carries out noise reduction process with the line line wave that non-faulting is mutually constituted for the line line wave to the phase containing failure.
In the technical scheme, short message is passed through by the fault point distance that suggestion device can will test at the first time
Mode is sent on the mobile terminal of relevant staff, is conducive to acceleration disturbance maintenance and is restored electricity, and is reduced to have a power failure and be brought
Loss, filter can line line wave to the phase containing failure with the line line wave that non-faulting is mutually constituted carry out noise reduction process,
Guarantee the accuracy of detection data, to rapidly and accurately determine position of failure point, mitigates line walking burden, use manpower and material resources sparingly.
In any of the above-described technical solution, it is preferable that processor is specifically used for: popular to three-phase voltage traveling wave or three-phase electricity
Wave carries out Fault Phase Selection, determines the failure phase and non-faulting phase of the transmission line of electricity；According to failure phase and non-faulting with respect to three-phase
Voltage traveling wave or three-phase current traveling wave carry out phase-model transformation processing, obtain what the line line wave of the phase containing failure was mutually constituted with non-faulting
Line line wave.
In the technical scheme, Fault Phase Selection is carried out to three-phase voltage traveling wave or three-phase current traveling wave, determines the phase that is out of order
With non-faulting phase, by taking a phase ground fault as an example, i.e., a phase is failure phase, according to the result of Fault Phase Selection to three-phase voltage traveling wave or
Three-phase current traveling wave carries out phase-model transformation processing, obtains the line line wave of the phase containing failure and line line wave that non-faulting is mutually constituted,
In order to the line line wave that the line line wave of subsequent basis phase containing failure is mutually constituted with non-faulting, determine that being overlapped brake cable line wave exists
The superposition component of fault point mitigates line walking burden, uses manpower and material resources sparingly, be conducive to accelerate to calculate the distance of fault point
Trouble hunting with restore electricity, reduce power failure bring loss.
In any of the above-described technical solution, it is preferable that following formula is used, to three-phase voltage traveling wave or three-phase current traveling wave
Phase-model transformation processing is carried out, by taking a phase ground fault as an example:
Yα=Ua-Ub Yα=Ia-Ib
Yγ=Ub-UcOr Yγ=Ib-Ic
Wherein, a phase is failure phase, and b, c phase are non-faulting phase, YαIndicate the line line wave of the phase containing failure, YγIndicate non-event
Hinder the line line wave mutually constituted, UaIndicate a phase voltage traveling wave, Ub、UcRespectively indicate b, c phase voltage traveling wave, IaIndicate a phase current
Traveling wave, Ib、IcRespectively indicate b, c phase current traveling wave.
In the technical scheme, when singlephase earth fault occurs for transmission line of electricity, by taking a phase ground fault as an example, i.e. a phase is
Failure phase, b, c phase are non-faulting phase, i.e., a phase voltage traveling wave is faulted phase voltage traveling wave, and b, c phase voltage traveling wave are non-faulting phase
Voltage traveling wave, a phase current traveling wave are the faulted phase current traveling wave, and b, c phase current traveling wave are the non-faulting phase current traveling wave,
By the collected three-phase voltage traveling wave of measurement point or three-phase current traveling wave, the line line wave and non-faulting phase of the phase containing failure are constructed
The line line wave of composition, distance measuring method proposed by the present invention is applicable in voltage traveling wave and current traveling wave, and is used for fault localization
Traveling wave electric amount can be selected according to live mutual inductor installation situation with requirement of engineering, it is applied widely.
Specifically, it is converted using Karenbauer (triumphant human relations Bell) and carries out phase-model transformation, realize three-phase decoupling.
In any of the above-described technical solution, it is preferable that processing implement body is also used to: respectively to the line line wave of the phase containing failure
It is normalized with the line line wave that non-faulting is mutually constituted；According to the line line wave and normalizing of the phase containing failure after normalization
The line line wave that non-faulting after change is mutually constituted determines and is overlapped brake cable line wave in the superposition component of fault point.
In the technical scheme, the line line wave of the phase containing failure is returned with the line line wave that non-faulting is mutually constituted respectively
One change processing, and the line line mutually constituted according to the line line wave of the phase containing failure after normalization with the non-faulting after normalization
Wave calculates and is overlapped brake cable line wave in the superposition component of fault point.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, without event in the line lay wire network mutually constituted due to non-faulting
Hinder branch, so the propagation of its line line wave is not influenced by fault point.Therefore, according to principle of stacking, above-mentioned two difference is utilized
The difference of traveling wave in line lay wire network can construct the superposition component for being overlapped brake cable line wave, this superposition component only reacts reclosing
Line line wave is in the catadioptric situation of fault point, and not by the interference of wave impedance discontinuity point, the method is not required to propagation characteristic
Will to regular link carry out reclosing recording, from stored without data, alignment of data, it is possible to reduce regular link reclosing pair
The unnecessary impact of power grid.
In any of the above-described technical solution, it is preferable that following formula is used, respectively to the line line wave of the phase containing failure and non-
The line line wave that failure is mutually constituted is normalized:
Wherein, 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,
YγIndicate 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,Table
The line line wave of the phase containing failure after showing normalization,The line line wave that non-faulting after indicating normalization is mutually constituted.
In the technical scheme, according to the first modulus maxima of the line line wave of the phase containing failure and the line line wave of the phase containing failure
Value, is normalized the line line wave of the phase containing failure, the line line wave and non-faulting phase structure mutually constituted according to non-faulting
At line line wave first modulus maximum, the line line wave that non-faulting is mutually constituted is normalized, thus according to returning
The line line wave that the line line wave of the phase containing failure after one change is mutually constituted with the non-faulting after normalization, calculates only faults
The superposition component of point information.
In any of the above-described technical solution, it is preferable that use following formula, determine and be overlapped brake cable line wave in fault point
It is superimposed component:
Wherein,Indicate be overlapped brake cable line wave fault point superposition component,Phase containing failure after indicating normalization
Line line wave,The line line wave that non-faulting after indicating normalization is mutually constituted.
In the technical scheme, line line wave and normalization according to principle of stacking, by the phase containing failure after normalization
The line line wave that non-faulting afterwards is mutually constituted, construct be overlapped brake cable line wave only in the superposition component of fault point, thus into
In row ranging process, do not need to regular link carry out reclosing recording, from stored without data, alignment of data, can subtract
Unnecessary impact of the normal circuit re-switching of Shaozheng to power grid.
In any of the above-described technical solution, it is preferable that processing implement body is also used to: respectively to the line line wave of the phase containing failure
The line line wave mutually constituted with non-faulting carries out wavelet transformation, obtains the first modulus maximum of the line line wave of the phase containing failure and non-
The first modulus maximum for the line line wave that failure is mutually constituted.
In the technical scheme, due to line mould that the line line wave of the phase containing failure after phase-model transformation is mutually constituted with non-faulting
The amplitude of traveling wave is different, therefore, carries out small echo to the line line wave that the line line wave of the phase containing failure is mutually constituted with non-faulting respectively
Transformation, the first modulus maximum after obtaining wavelet transformation, further according to the first modulus maximum to the line line wave of the phase containing failure with
The line line wave that non-faulting is mutually constituted is normalized, and obtains the superposition component of only faults point information, thus into
In row ranging process, do not need to regular link carry out reclosing recording, from stored without data, alignment of data, can subtract
Unnecessary impact of the normal circuit re-switching of Shaozheng to power grid.
In any of the above-described technical solution, it is preferable that following formula is used, respectively to the line line wave of the phase containing failure and non-
The line line wave that failure is mutually constituted carries out wavelet transformation:
Wherein, f (n) indicates the data point for the line line wave that the line line wave of the phase containing failure or non-faulting are mutually constituted, and n is to adopt
Sampling point, V2jF (n) indicates the approximation component of jth scale, W2jF (n) indicates the Wavelet Component of jth scale, and h (k), g (k) indicate filter
Wave device parameter, j are scale, and k is currently processed data point, and k is positive integer, and η is construction coefficient.
And using following formula, modulus maximum after determining wavelet transformation:
Wherein, M2jF (n) indicates the modulus maximum of the wavelet transformation of jth scale, nkIndicate the kth points in current scale
According to W2jf(nk) indicate current scale in kth point data jth scale Wavelet Component.
In the technical scheme, wavelet transformation is carried out by above formula, can reduce transmission line of electricity Single Terminal Traveling Wave Fault Location
Error, guarantee the accuracy of fault point ranging, to reduce the additional use for installing injection device additional, hardware investment is few, and
It does not need regular link and is overlapped recorder data, it is small to power grid impact, there is good practical performance and economic performance.
In any of the above-described technical solution, it is preferable that use following formula, determine between fault point and measurement point away from
From:
Wherein, x indicates the distance between fault point and measurement point, t1Indicate Reclosing Instant, t2Indicate the of superposition component
The arrival time of i.e. first fault point back wave at the time of one modulus maximum corresponds to, v indicate the line of voltage or current traveling wave
Mould wave velocity.
In the technical scheme, the first of component is superimposed fault point according to Reclosing Instant, coincidence brake cable line wave
The arrival time of i.e. first fault point back wave and three-phase voltage traveling wave or three-phase current traveling wave at the time of modulus maximum corresponds to
Line mould wave velocity, calculate the distance between fault point and measurement point, to be quickly and accurately positioned fault point, mitigate line walking
Burden, is conducive to acceleration disturbance maintenance and restores electricity, and reduces the loss of power failure bring, and fault localization result is not by route point
Fulcrum, transition resistance, system operation mode variation and the influence of load, meanwhile, fault localization does not need additionally to install additional to inject to set
Standby, hardware investment is few, is applicable in voltage traveling wave and current traveling wave, applied widely, and ranging process does not need normally
The single-phase coincidence recorder data of route, it is small to power grid impact, be conducive to promote range-measurement system stability and reliability.
Additional aspect and advantage of the invention will become obviously in following description section, or practice through the invention
Recognize.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 shows the fault localization system schematic block diagram of the transmission line of electricity of one embodiment of the present of invention；
Fig. 2 shows the line mould network diagrams of the phase containing failure of one embodiment of the present of invention；
The line mould network diagram that the non-faulting that Fig. 3 shows one embodiment of the present of invention is mutually constituted；
Fig. 4 shows the fault point superposition component network schematic diagram of one embodiment of the present of invention；
Fig. 5 shows the schematic diagram of the T connection electric transmission line model of a specific embodiment of the invention；
Fig. 6 shows the reclosing three-phase voltage traveling wave schematic diagram of a specific embodiment of the invention；
Fig. 7 shows the line that the line line wave of the phase containing failure of a specific embodiment of the invention is mutually constituted with non-faulting
Line wave schematic diagram；
Fig. 8 shows the line line wave of the phase containing failure after the normalization of a specific embodiment of the invention, normalization
The line line wave and be overlapped brake cable line wave in the superposition component schematic diagram of fault point that non-faulting afterwards is mutually constituted；
Fig. 9 shows line line wave and the normalization of the phase containing failure after the normalization of a specific embodiment of the invention
The wavelet transformation and modulus maximum schematic diagram for the line line wave that non-faulting afterwards is mutually constituted；
What Figure 10 showed a specific embodiment of the invention is overlapped brake cable line wave in the superposition component of fault point
Wavelet transformation and modulus maximum schematic diagram.
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, implementation of the invention
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
To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not limited to following public affairs
The limitation for the specific embodiment opened.
One embodiment of the present of invention proposes a kind of fault localization system 100 of transmission line of electricity, is suitable for transmission line of electricity and sends out
Reclosing device carries out reclosing after raw single-phase fault, as shown in Figure 1, the system includes: wave recording device 102,104 He of processor
Display device 106.
Specifically, wave recording device 102 is located at the measurement point of transmission line of electricity, for acquiring reclosing three-phase voltage traveling wave or three
Phase current traveling wave；Processor 104 is connect with wave recording device 102, for according to three-phase voltage traveling wave or three-phase current traveling wave, structure
Make the line line wave of the phase containing failure and line line wave that non-faulting is mutually constituted；And the line line wave and non-faulting phase of the phase containing failure
The line line wave of composition determines and is overlapped brake cable line wave in the superposition component of fault point；And exist according to brake cable line wave is overlapped
The superposition component and Reclosing Instant of fault point, determine the distance between fault point and measurement point；Display device 106, with processing
Device 104 connects, for showing the fault point distance of transmission line of electricity.
The fault localization system 100 of transmission line of electricity provided in this embodiment is overlapped when single-phase fault occurs for transmission line of electricity
Brake gear can execute reclosing operation automatically, after reclosing device carries out reclosing, be adopted in measurement point by wave recording device 102
Collect reclosing three-phase voltage traveling wave or three-phase current traveling wave, processor 104 is raw according to three-phase voltage traveling wave or three-phase current traveling wave
At the line line wave that the line line wave of the phase containing failure is mutually constituted with non-faulting, and determines and be overlapped brake cable line wave in the folded of fault point
Bonus point amount determines fault point and measurement point further according to brake cable line wave is overlapped in the superposition component and Reclosing Instant of fault point
The distance between, and fault point distance data are shown by display device 106, wherein brake cable line wave is overlapped as reclosing dress
The line line wave set, the line line wave of the phase containing failure are by containing the line line wave mutually constituted including faulty phase, non-faulting phase
The line line wave of composition is the line line wave being only mutually made of non-faulting.It, can be quick and precisely by above-mentioned fault localization system
Ground obtains transmission line one-phase earth fault distance, is conducive to acceleration disturbance maintenance and restores electricity, and reduces power failure bring damage
It loses, mitigates line walking burden, use manpower and material resources sparingly, and fault localization result is not by line branch point, transition resistance, system operation side
Formula variation and the influence of load, can accurately determine position of failure point.Meanwhile fault localization does not need additionally to install additional to inject to set
Standby, hardware investment is few, is applicable in voltage traveling wave and current traveling wave, applied widely, and ranging process does not need normal line
Road is overlapped recorder data, small to power grid impact, is conducive to promote range-measurement system stability and reliability.
In specific embodiment, wave recording device 102 records reclosing high frequency transient traveling wave information, and sample rate is greater than or equal to
1MHz。
In one embodiment of the invention, as shown in Figure 1, the fault localization system 100 of transmission line of electricity includes: recording dress
Set 102, processor 104 and display device 106, power supply 108, suggestion device 110, filter 112.
Specifically, power supply 108, for providing electric energy for the fault localization system 100 of transmission line of electricity；Suggestion device 110, with
Processor 104 connects, for sending the distance between fault point and measurement point by short message；Filter 112, with processor
104 connections carry out noise reduction process with the line line wave that non-faulting is mutually constituted for the line line wave to the phase containing failure.
In this embodiment, short message is passed through by the fault point distance that suggestion device 110 can will test at the first time
Mode be sent on the mobile terminal of relevant staff, be conducive to acceleration disturbance maintenance with restore electricity, reduction power failure band
The loss come, filter 112 can line line wave to the phase containing failure with the line line wave that non-faulting is mutually constituted carry out noise reduction
Processing, guarantees the accuracy of detection data, to rapidly and accurately determine position of failure point, mitigates line walking burden, saves manpower
Material resources.
In one embodiment of the invention, it is preferable that processor 104 is specifically used for: to three-phase voltage traveling wave or three-phase
Current traveling wave carries out Fault Phase Selection, determines the failure phase and non-faulting phase of transmission line of electricity；According to failure phase and non-faulting opposite three
Phase voltage traveling wave or three-phase current traveling wave carry out phase-model transformation processing, and the line line wave for obtaining the phase containing failure is mutually constituted with non-faulting
Line line wave.
Preferably, phase-model transformation processing is carried out to three-phase voltage or current traveling wave by following formula, with a phase ground fault
For:
Yα=Ua-Ub Yα=Ia-Ib
Yγ=Ub-UcOr Yγ=Ib-Ic
Wherein, a phase is failure phase, and b, c phase are non-faulting phase, YαIndicate the line line wave of the phase containing failure, YγIndicate non-event
Hinder the line line wave mutually constituted, UaIndicate a phase voltage traveling wave, Ub、UcRespectively indicate b, c phase voltage traveling wave, IaIndicate a phase current
Traveling wave, Ib、IcRespectively indicate b, c phase current traveling wave.
In this embodiment, as shown in Figure 6 and Figure 7, when singlephase earth fault occurs for transmission line of electricity, to three-phase voltage row
Wave or three-phase current traveling wave carry out Fault Phase Selection, determine that be out of order phase and non-faulting phase are connected by taking a phase ground fault as an example with a
For ground, i.e., a phase is failure phase, and b, c phase are non-faulting phase, according to the result of Fault Phase Selection to three-phase voltage traveling wave or three-phase electricity
Popular wave carries out phase-model transformation processing, obtains the line line wave of the phase containing failure and line line wave that non-faulting is mutually constituted, in order to
The line line wave that the line line wave of subsequent basis phase containing failure is mutually constituted with non-faulting determines and is overlapped brake cable line wave in fault point
Superposition component mitigate line walking burden, use manpower and material resources sparingly to calculate the distance of fault point, be conducive to acceleration disturbance inspection
Repair and restore electricity, reduce the loss of power failure bring, there is good practical performance and economic performance, and to voltage traveling wave and
Current traveling wave is applicable in, applied widely, wherein the line lay wire network of the phase containing failure is as shown in Fig. 2, the line that non-faulting is mutually constituted
Lay wire network is as shown in Figure 3.
It in specific embodiment, is converted using Karenbauer (triumphant human relations Bell) and carries out phase-model transformation, realize three-phase decoupling.
In one embodiment of the invention, it is preferable that processor 104 is specifically also used to: respectively to the line of the phase containing failure
Line wave is normalized with the line line wave that non-faulting is mutually constituted；According to the line line wave of the phase containing failure after normalization
The line line wave mutually constituted with the non-faulting after normalization determines and is overlapped brake cable line wave in the superposition component of fault point.
Preferably, the line line wave line line wave of the phase containing failure and non-faulting being mutually made up of respectively following formula into
Row normalized:
Wherein, 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,
YγIndicate 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,Table
The line line wave of the phase containing failure after showing normalization,The line line wave that non-faulting after indicating normalization is mutually constituted.
According to the line line wave that the line line wave of the phase containing failure after normalization is mutually constituted with the non-faulting after normalization, meter
Calculate the superposition component of only faults point information.
Preferably, it is determined by following formula and is overlapped brake cable line wave in the superposition component of fault point:
Wherein,Indicate be overlapped brake cable line wave fault point superposition component,Phase containing failure after indicating normalization
Line line wave,The line line wave that non-faulting after indicating normalization is mutually constituted.
In this embodiment, as shown in figure 9, according to the head of the line line wave of the phase containing failure and the line line wave of the phase containing failure
The line line wave of the phase containing failure is normalized in a modulus maximum, the line line wave that is mutually constituted according to non-faulting and non-
The line line wave that non-faulting is mutually constituted is normalized in the first modulus maximum for the line line wave that failure is mutually constituted, and
According to the line line wave that the line line wave of the phase containing failure after normalization is mutually constituted with the non-faulting after normalization, calculate only anti-
Reflect the superposition component of fault point information, wherein it is as shown in Figure 4 that fault point is superimposed component network.
In one embodiment of the invention, it is preferable that processor 104 is specifically also used to: respectively to the line of the phase containing failure
Line wave carries out wavelet transformation with the line line wave that non-faulting is mutually constituted, and obtains the first modulus maxima of the line line wave of the phase containing failure
The first modulus maximum for the line line wave that value is mutually constituted with non-faulting.
Preferably, the line line wave line line wave of the phase containing failure and non-faulting being mutually made up of respectively following formula into
Row wavelet transformation:
Wherein, f (n) indicates the data point for the line line wave that the line line wave of the phase containing failure or non-faulting are mutually constituted, and n is to adopt
Sampling point,Indicate the approximation component of jth scale,Indicate the Wavelet Component of jth scale, h (k), g (k) indicate filter
Wave device parameter, j are scale, and k is currently processed data point, and k is positive integer, and η is construction coefficient.
Preferably, the modulus maximum after wavelet transformation is determined by following formula:
Wherein,Indicate the modulus maximum of the wavelet transformation of jth scale, nkIndicate the kth points in current scale
According to,Indicate the Wavelet Component of the jth scale of the kth point data in current scale.
In this embodiment, due to line line that the line line wave of the phase containing failure after phase-model transformation is mutually constituted with non-faulting
The amplitude of wave is different, therefore, carries out small echo change to the line line wave that the line line wave of the phase containing failure is mutually constituted with non-faulting respectively
It changes, the first modulus maximum after obtaining wavelet transformation, as shown in figure 8, further according to the first modulus maximum to the line of the phase containing failure
The line line wave that line wave is mutually constituted with non-faulting is normalized, and obtains the superposition component of only faults point information,
To carry out ranging process in, do not need to regular link carry out reclosing recording, from stored without data, data pair
Together, it is possible to reduce unnecessary impact of the regular link reclosing to power grid.
In one embodiment of the invention, it is preferred that by following formula determine between fault point and measurement point away from
From:
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 the first modulus maximum of the superposition component of fault point corresponds to, v
Indicate the line mould wave velocity of three-phase voltage traveling wave or three-phase current traveling wave.
In the technical scheme, the first of component is superimposed fault point according to Reclosing Instant, coincidence brake cable line wave
The arrival time of i.e. first fault point back wave and three-phase voltage traveling wave or three-phase current traveling wave at the time of modulus maximum corresponds to
Line mould wave velocity, calculate the distance between fault point and measurement point.It can be quickly and accurately positioned fault point, mitigate line walking
Burden, is conducive to acceleration disturbance maintenance and restores electricity, and reduces the loss of power failure bring, and fault localization result is not by route point
Fulcrum, transition resistance, system operation mode variation and the influence of load, meanwhile, fault localization does not need additionally to install additional to inject to set
Standby, hardware investment is few, is applicable in voltage traveling wave and current traveling wave, applied widely, and does not need regular link coincidence
Recorder data impacts power grid small.
In one particular embodiment of the present invention, using PSCAD (Power Systems Computer Aided
Design, electromagnetic transient simulation software) simulation study has been carried out to electric system, analogue system is using voltage shown in fig. 5 etc.
" T " that grade is 220kV connects ultra-high-tension power transmission line model, and M, N, P are three end power supplys, and S is the measurement point at the end M, and T point is lines branch
Point is wave impedance discontinuity point, and F point is fault point, and R is transition resistance, and singlephase earth fault occurs for route, and (T connects simulated line
Ultra-high-tension power transmission line model) model and parameter difference it is as shown in table 1, the power parameter of simulated line is as shown in table 2.
1 simulated line parameter of table
| Route | Route model | Line length (km) |
| LMT | GL/GIA-300/40 | 60 |
| LNT | GL/GIA-300/40 | 50 |
| LPT | GL/GIA-300/40 | 40 |
2 power parameter of table
| Power supply | Amplitude (kV) | Phase angle (°) |
| M | 220 | 0 |
| N | 220 | 30 |
| P | 220 | -30 |
Away from a phase ground fault occurs at route M end 70km on route MN, transition resistance is 20 Ω.It is with Reclosing Instant
Starting point, the original traveling wave U of three-phase voltage that the wave recording device 102 of measurement point acquiresa、Ub、Uc, as shown in Figure 6.Pass through processor
104 pairs of three-phase voltages carry out Fault Phase Selection, determine failure phase and non-faulting phase, and carry out phase-model transformation processing to three-phase voltage,
Obtain the line line wave of the corresponding phase containing failure of three-phase voltage traveling wave and line line wave that non-faulting is mutually constituted, as shown in Figure 7.
Small echo change is carried out to the line line wave that the line line wave of the phase containing failure, non-faulting are mutually constituted respectively by following formula
It changes,
And the line line wave of the phase containing failure, non-faulting after wavelet transformation are calculated by following formula and mutually constituted
The modulus maximum of line line wave, as shown in figure 9,
Wherein, f (n) indicates the data point for the line line wave that the line line wave of the phase containing failure or non-faulting are mutually constituted, and n is to adopt
Sampling point,Indicate the approximation component of jth scale,Indicate the Wavelet Component of jth scale, h (k), g (k) indicate filter
Wave device parameter, j are scale, and k is currently processed data point, and k is positive integer, and η is construction coefficient,Indicate jth ruler
The modulus maximum of the wavelet transformation of degree, nkIndicate the kth point data in current scale,Indicate the kth in current scale
The Wavelet Component of the jth scale of point data.
According still further to following formula, the line line wave of the phase containing failure is returned with the line line wave that non-faulting is mutually constituted respectively
One change processing, according to the line line wave that the line line wave of the phase containing failure after normalization, non-faulting are mutually constituted, calculates reclosing
Line line wave fault point superposition component, as shown in figure 8,
Wherein, 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,
YγIndicate 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,Table
The line line wave of the phase containing failure after showing normalization,The line line wave that non-faulting after indicating normalization is mutually constituted.
It is calculated by following formula and is overlapped brake cable line wave in the superposition component of fault point:
Wherein,Indicate be overlapped brake cable line wave fault point superposition component,Phase containing failure after indicating normalization
Line line wave,The line line wave that non-faulting after indicating normalization is mutually constituted.
In addition, being checked for the ease of carrying out the comparison of failure amount, superposition component of the counterweight closing line line wave in fault point
Wavelet transformation is carried out, as shown in Figure 10.
The distance between fault point and measurement point are determined finally 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 the first modulus maximum of the superposition component of fault point corresponds to, v
Indicate the line mould wave velocity of three-phase voltage traveling wave or three-phase current traveling wave.
Obtaining distance measurement result by the embodiment is 69.84km, and fault distance true value is 70km, and absolute error is
160m, relative error 0.2286%, fault localization resultant error is small, accurate positioning.
In another specific embodiment of the invention, for verify distance measuring method performance, on route MN different location,
Fault localization in the case of different transition resistances is as a result, as shown in table 3.
3 distance measurement result of table
It is with higher by the fault localization system of above-mentioned simulation results show the present embodiment not by transition Resistance Influence
Reliability, range error are less than 0.5km, can accurately and effectively determine position of failure point.
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 fault localization system of transmission line of electricity is suitable for utilizing reclosing row after single-phase fault occurs for the transmission line of electricity
Wave carries out localization of fault characterized by comprising
Wave recording device, positioned at the measurement point of the transmission line of electricity, for acquiring the reclosing three-phase voltage traveling wave or three-phase electricity
Popular wave；
Processor is connect with the wave recording device, for according to the three-phase voltage traveling wave or the three-phase current traveling wave, construction
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；And
According to it is described coincidence brake cable line wave fault point superposition component and Reclosing Instant, determine the fault point with it is described
The distance between measurement point；
Display device is connected to the processor, for showing the fault point distance of the transmission line of electricity.
2. the fault localization system of transmission line of electricity according to claim 1, which is characterized in that further include:
Power supply, for providing electric energy for the fault localization system of the transmission line of electricity；
Suggestion device is connected to the processor, for sending the distance between fault point and measurement point by short message；
Filter is connected to the processor, and is mutually constituted for the line line wave to the phase containing failure with the non-faulting
Line line wave carry out noise reduction process.
3. the fault localization system of transmission line of electricity according to claim 1, which is characterized in that the processor, it is specific to use
In:
Fault Phase Selection is carried out to the three-phase voltage traveling wave or the three-phase current traveling wave, determines the failure phase of the transmission line of electricity
With non-faulting phase；
Phase mould is carried out according to the relatively described three-phase voltage traveling wave of the failure phase and the non-faulting or the three-phase current traveling wave
Conversion process obtains the line line wave that the line line wave of the phase containing failure is mutually constituted with the non-faulting.
4. the fault localization system of transmission line of electricity according to claim 3, which is characterized in that
Using following formula, phase-model transformation processing is carried out to the three-phase voltage traveling wave or the three-phase current traveling wave, is connected with a
For earth fault:
Yα=Ua-Ub Yα=Ia-Ib
Yγ=Ub-UcOr Yγ=Ib-Ic
Wherein, a phase is the failure phase, and b, c phase are the non-faulting phase, YαIndicate the line line wave of the phase containing failure, YγTable
Show the line line wave that the non-faulting is mutually constituted, UaIndicate a phase voltage traveling wave, Ub、UcRespectively indicate b, c phase voltage traveling wave, IaTable
Show a phase current traveling wave, Ib、IcRespectively indicate b, c phase current traveling wave.
5. the fault localization system of transmission line of electricity according to claim 2, which is characterized in that the processor, it is specific to go back
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；
The line line that the line line wave of the phase containing failure according to after normalization is mutually constituted with the non-faulting after normalization
Wave determines the coincidence brake cable line wave in the superposition component of fault point.
6. the fault localization system of transmission line of electricity according to claim 5, which is characterized in that
Using following formula, the line line wave of the phase containing failure is carried out with the line line wave that the non-faulting is mutually constituted respectively
Normalized:
Wherein, YαIndicate the line line wave of the phase containing failure, MαIndicate the first modulus maxima of the line line wave of the phase containing failure
Value, YγIndicate the line line wave that the non-faulting is mutually constituted, MγIndicate the first mould for the line line wave that the non-faulting is mutually constituted
Maximum,The line line wave of the phase containing failure after indicating normalization,The non-faulting phase structure after indicating normalization
At line line wave.
7. the fault localization system of transmission line of electricity according to claim 5, which is characterized in that
Using following formula, determine the coincidence brake cable line wave in the superposition component of fault point:
Wherein,Indicate the coincidence brake cable line wave in the superposition component of fault point.
8. the fault localization system of transmission line of electricity according to claim 5, which is characterized in that the processor, it is specific to go back
For:
Wavelet transformation is carried out with the line line wave that the non-faulting is mutually constituted to the line line wave of the phase containing failure respectively, is obtained
The first modulus maxima for the line line wave that the first modulus maximum of the line line wave of the phase containing failure is mutually constituted with the non-faulting
Value.
9. the fault localization system of transmission line of electricity according to claim 8, which is characterized in that
Using following formula, the line line wave of the phase containing failure is carried out with the line line wave that the non-faulting is mutually constituted respectively
Wavelet transformation:
Wherein, f (n) indicates the data point for the line line wave that the line line wave of the phase containing failure or the non-faulting are mutually constituted, n
For sampled point,Indicate the approximation component of jth scale,Indicate the Wavelet Component of jth scale, h (k), g (k) table
Show that the filter parameter, j are scale, k is currently processed data point, and η is construction coefficient；
Using following formula, modulus maximum after determining wavelet transformation:
Wherein,Indicate the modulus maximum of the wavelet transformation of jth scale, nkIndicate the kth point data in current scale,Indicate the Wavelet Component of the jth scale of the kth point data in current scale.
10. the fault localization system of transmission line of electricity according to any one of claim 1 to 9, which is characterized in that
Using following formula, the distance between the fault point and the measurement point are determined:
Wherein, x indicates the distance between the fault point and the measurement point, t1Indicate the Reclosing Instant, t2Described in expression
The arrival time of i.e. first fault point back wave, v indicate the electricity at the time of first modulus maximum of superposition component corresponds to
The line mould wave velocity of pressure or current traveling wave.
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