CN110456228A - A kind of fault distance-finding method of transmission line of electricity - Google Patents
A kind of fault distance-finding method of transmission line of electricity Download PDFInfo
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- CN110456228A CN110456228A CN201910780586.0A CN201910780586A CN110456228A CN 110456228 A CN110456228 A CN 110456228A CN 201910780586 A CN201910780586 A CN 201910780586A CN 110456228 A CN110456228 A CN 110456228A
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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 invention proposes a kind of fault distance-finding methods of transmission line of electricity, comprising: acquires reclosing three-phase voltage traveling wave or three-phase current traveling wave in measurement point；According to three-phase voltage traveling wave or three-phase current traveling wave, the line line wave that the line line wave of the phase containing failure is mutually constituted with non-faulting is constructed；According to the line line wave 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；Superposition component and Reclosing Instant according to coincidence brake cable line wave in fault point, determine the distance between fault point and measurement point, to be quickly and accurately positioned fault point, mitigate line walking burden, be conducive to acceleration disturbance maintenance and restore electricity, and fault localization result is not influenced by line branch point, transition resistance, system operation mode variation and load, simultaneously, fault localization does not need additionally to install injection device additional, hardware investment is few, it does not need regular link and is overlapped recorder data, there is good practical performance and economic performance.
Description
Technical field
The present invention relates to technical field of power systems, in particular to a kind of fault distance-finding method 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 distance-finding methods of transmission line of electricity.
In view of this, a kind of fault distance-finding method of transmission line of electricity is proposed, suitable for being installed with the height of reclosing device
There is a situation where singlephase earth faults for pressure transmission line, comprising: acquires reclosing three-phase voltage traveling wave or three-phase electricity in measurement point
Popular wave；According to three-phase voltage traveling wave or three-phase current traveling wave, what the line line wave of construction phase containing failure was mutually constituted with non-faulting
Line line wave；According to the line line wave that the line line wave of the phase containing failure is mutually constituted with non-faulting, determine that being overlapped brake cable line wave exists
The superposition component of fault point；According to brake cable line wave is overlapped in the superposition component and Reclosing Instant of fault point, fault point is determined
The distance between measurement point.
The fault distance-finding method 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 completes reclosing, in measurement point (protection safe place), acquisition is overlapped
Lock three-phase voltage traveling wave or three-phase current traveling wave generate the line of the phase containing failure according to three-phase voltage traveling wave or three-phase current traveling wave
The line line wave that line wave is mutually constituted with non-faulting, and determine and be overlapped brake cable line wave in the superposition component of fault point, in basis
Brake cable line wave is overlapped in the superposition component and Reclosing Instant of fault point, determines the distance between fault point and measurement point,
In, it is overlapped the line line wave that brake cable line wave is reclosing device, the line line wave of the phase containing failure is by containing including faulty phase
The line line wave mutually constituted, the line line wave that non-faulting is mutually constituted is the line line wave being only mutually made of non-faulting.By upper
Fault distance-finding method is stated, transmission line one-phase earth fault distance can be rapidly and accurately obtained, mitigates line walking burden, saves people
Power material resources, are conducive to acceleration disturbance maintenance and restore electricity, and reduce the loss of power failure bring, and fault localization result is not by route
Branch point, transition resistance, system operation mode variation and the influence of load, can accurately determine position of failure point.Meanwhile failure
Ranging does not need additionally to install injection device additional, and hardware investment is few, is applicable in voltage traveling wave and current traveling wave, applied widely
It is general, and do not need regular link and be overlapped recorder data, it is small to power grid impact, there is good practical performance and economic performance.
In addition, the fault distance-finding method 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 according to three-phase voltage traveling wave or three-phase current traveling wave, generate the phase containing failure
It the step of line line wave that line line wave is mutually constituted with non-faulting, specifically includes: to three-phase voltage traveling wave or three-phase current traveling wave
Fault Phase Selection is carried out, determines the failure phase and non-faulting phase of transmission line of electricity；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 that the line line wave of the phase containing failure is mutually constituted with non-faulting
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, have good practical performance and economic performance.
In any of the above-described technical solution, it is preferable that by following formula 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:
Or
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 can be applicable in voltage traveling wave and current traveling wave, and be used for failure
The traveling wave electric amount of ranging can be applied widely according to live mutual inductor installation situation and requirement of engineering unrestricted choice.
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 the line mutually constituted according to the line line wave of the phase containing failure with non-faulting
Line wave determines and is overlapped brake cable line wave the superposition component of fault point the step of, specifically includes: 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.
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 containing fault branch in the line lay wire network of the phase containing failure,
Then the propagation of its line line wave is influenced by fault point, fault branch is free of in the line lay wire network that non-faulting is mutually constituted, then its line mould
The propagation of traveling wave is not influenced by fault point.Therefore, according to principle of stacking, it can construct and be overlapped brake cable line wave only in fault point
Superposition component, do not need regular link and be overlapped recorder data, be not required to data storage, alignment of data, reduce to the combined floodgate of power grid
Impact.
In any of the above-described technical solution, it is preferable that by following formula 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
Superposition component of the line line wave of point information in fault point.
In any of the above-described technical solution, it is preferable that determined by following formula 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
It in row ranging process, does not need regular link and is overlapped recorder data, be not required to data storage, alignment of data, reduce the conjunction to power grid
Lock impact.
In any of the above-described technical solution, it is preferable that mutually constituted to the line line wave of the phase containing failure with non-faulting respectively
Before the step of line line wave is normalized, further includes: respectively to the line line wave of the phase containing failure and non-faulting phase structure
At line line wave carry out wavelet transformation, obtain what the first modulus maximum of the line line wave of the phase containing failure was mutually constituted with non-faulting
The first modulus maximum of line line wave.
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 corresponds to first jump wave head, further according to the first modulus maximum to containing
The line line wave that line line wave and the non-faulting of failure phase are mutually constituted is normalized, and obtains only faults point information
It is superimposed component, to not need regular link in carrying out ranging process and be overlapped recorder data, is not required to data storage, data pair
Together, reduce and the combined floodgate of power grid is impacted.
In any of the above-described technical solution, it is preferable that by following formula 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,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 parameter, and k is data point, and η is construction coefficient.
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 the modulus maximum after determining wavelet transformation 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 any of the above-described technical solution, it is preferable that determine the distance between fault point and measurement point 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
For wave at the time of the first modulus maximum of the superposition component of fault point corresponds to, v indicates three-phase voltage traveling wave or three-phase current traveling wave
Line 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 wave velocity of i.e. first fault point back wave arrival time and line line wave, can calculate and be out of order at the time of modulus maximum corresponds to
Accurate distance between point and measurement point mitigates line walking burden, is conducive to acceleration disturbance to be quickly and accurately positioned fault point
It overhauls and restores electricity, reduce the loss of power failure bring, and fault localization result is not by line branch point, transition resistance, system
The influence of changes of operating modes and load, meanwhile, fault localization does 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 do not need regular link and be overlapped recorder data, power grid is impacted
It is small, there is good practical performance and economic performance.
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 distance-finding method flow diagram of the transmission line of electricity of one embodiment of the present of invention；
Fig. 2 shows the fault distance-finding method flow diagrams of the transmission line of electricity of another embodiment of the invention；
Fig. 3 shows the fault distance-finding method flow diagram of the transmission line of electricity of yet another embodiment of the present invention；
Fig. 4 shows the line mould network diagram of the phase containing failure of one embodiment of the present of invention；
The line mould network diagram that the non-faulting that Fig. 5 shows one embodiment of the present of invention is mutually constituted；
Fig. 6 shows the fault point superposition component network schematic diagram of one embodiment of the present of invention；
Fig. 7 shows the schematic diagram of the T connection electric transmission line model of a specific embodiment of the invention；
Fig. 8 shows the reclosing three-phase voltage traveling wave schematic diagram of a specific embodiment of the invention；
Fig. 9 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；
Figure 10 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；
Figure 11 shows the line line wave and normalizing 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 after change is mutually constituted；
What Figure 12 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 distance-finding method of transmission line of electricity, is suitable for transmission line of electricity
Reclosing device carries out reclosing after single-phase fault, and the failure that Fig. 1 shows the transmission line of electricity of one embodiment of the present of invention is surveyed
Away from method flow schematic diagram.Wherein, this method comprises:
Step 102, reclosing three-phase voltage traveling wave or three-phase current traveling wave are acquired in measurement point；
Step 104, according to three-phase voltage traveling wave or three-phase current traveling wave, the line line wave and non-faulting of the phase containing failure are constructed
The line line wave mutually constituted；
Step 106, the line line wave mutually constituted according to the line line wave of the phase containing failure with non-faulting determines and is overlapped brake cable mould
Superposition component of the traveling wave in fault point；
Step 108, according to be overlapped brake cable line wave fault point superposition component and Reclosing Instant, determine fault point with
The distance between measurement point.
The fault distance-finding method of transmission line of electricity provided in this embodiment, when single-phase fault occurs for transmission line of electricity, reclosing
Device can execute reclosing operation automatically, after reclosing device carries out reclosing, in measurement point (protection safe place) acquisition weight
Combined floodgate three-phase voltage traveling wave or three-phase current traveling wave generate the phase containing failure according to three-phase voltage traveling wave or three-phase current traveling wave
The line line wave that line line wave is mutually constituted with non-faulting, and determine and be overlapped brake cable line wave in the superposition component of fault point, then root
According to brake cable line wave is overlapped in the superposition component and Reclosing Instant of fault point, the distance between fault point and measurement point are determined,
Wherein, it is overlapped the line line wave that brake cable line wave is reclosing device, the line line wave of the phase containing failure is by existing containing faulty phase
The interior line line wave mutually constituted, the line line wave that non-faulting is mutually constituted are the line line wave being only mutually made of failure.By upper
Fault distance-finding method is stated, transmission line one-phase earth fault distance can be rapidly and accurately obtained, mitigates line walking burden, saves people
Power material resources, are conducive to acceleration disturbance maintenance and restore electricity, and reduce the loss of power failure bring, and fault localization result is not by route
Branch point, transition resistance, system operation mode variation and the influence of load, can accurately determine position of failure point.Meanwhile failure
Ranging does not need additionally to install injection device additional, and hardware investment is few, is applicable in voltage traveling wave and current traveling wave, applied widely
It is general, and do not need regular link and be overlapped recorder data, it is small to power grid impact, there is good practical performance and economic performance.
Fig. 2 shows of the invention one and the fault distance-finding method flow diagrams of the transmission line of electricity of embodiment.Wherein,
This method comprises:
Step 202, reclosing three-phase voltage traveling wave or three-phase current traveling wave are acquired in measurement point；
Step 204, Fault Phase Selection is carried out to three-phase voltage traveling wave or three-phase current traveling wave, determines the failure phase of transmission line of electricity
With non-faulting phase；
Step 206, phase-model transformation processing is carried out to three-phase voltage traveling wave or three-phase current traveling wave according to Fault Phase Selection result,
Obtain the line line wave of the phase containing failure and line line wave that non-faulting is mutually constituted；
Step 208, the line line wave mutually constituted according to the line line wave of the phase containing failure with non-faulting determines and is overlapped brake cable mould
Superposition component of the traveling wave in fault point；
Step 210, according to be overlapped brake cable line wave fault point superposition component and Reclosing Instant, determine fault point with
The distance between measurement point.
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:
Or
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 8 and Figure 9, 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 and are out of order mutually with non-faulting phase, by taking a phase ground fault as an example, i.e. a phase is
Failure phase, b, c phase are non-faulting phase, carry out phase mould to three-phase voltage traveling wave or three-phase current traveling wave according to the result of Fault Phase Selection
Conversion process obtains the line line wave of the phase containing failure and line line wave that non-faulting is mutually constituted, in order to which subsequent basis contains failure
The line line wave that the line line wave of phase is mutually constituted with non-faulting, determine be overlapped brake cable line wave fault point superposition component, from
And the distance of fault point is calculated, mitigate line walking burden, use manpower and material resources sparingly, is conducive to acceleration disturbance maintenance and restores electricity,
The loss of power failure bring is reduced, there is good practical performance and economic performance, and the distance measuring method that above-described embodiment proposes
Voltage traveling wave and current traveling wave are applicable in, and feelings can be installed according to live mutual inductor for the traveling wave electric amount of fault localization
Condition and requirement of engineering unrestricted choice, it is applied widely, wherein the line lay wire network of the phase containing failure is as shown in figure 4, non-faulting phase structure
At line lay wire network it is as shown in Figure 5.
It in specific embodiment, is converted using Karenbauer (triumphant human relations Bell) and carries out phase-model transformation, realize three-phase decoupling.
Fig. 3 shows the fault distance-finding method flow diagram of the transmission line of electricity of of the invention one and embodiment.Wherein,
This method comprises:
Step 302, reclosing three-phase voltage traveling wave or three-phase current traveling wave are acquired in measurement point；
Step 304, according to three-phase voltage traveling wave or three-phase current traveling wave, the line line wave and non-faulting of the phase containing failure are constructed
The line line wave mutually constituted；
Step 306, wavelet transformation is carried out with the line line wave that non-faulting is mutually constituted to the line line wave of the phase containing failure respectively,
Obtain the first modulus maximum of the line line wave of the phase containing failure and the first modulus maximum of line line wave that non-faulting is mutually constituted；
Step 308, the line line wave mutually constituted according to the first modulus maximum of the line line wave of the phase containing failure with non-faulting
First modulus maximum, place is normalized with the line line wave that non-faulting is mutually constituted to the line line wave of the phase containing failure respectively
Reason；
Step 310, the line mutually constituted according to the line line wave of the phase containing failure after normalization with the non-faulting after normalization
Line wave determines and is overlapped brake cable line wave in the superposition component of fault point；
Step 312, according to be overlapped brake cable line wave fault point superposition component and Reclosing Instant, determine fault point with
The distance between measurement 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 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 parameter, and k is data point, 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.
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, due to line line wave that the line line wave of the phase containing failure after phase-model transformation is mutually constituted with non-faulting
Amplitude it is different, therefore, as shown in Figure 10 and Figure 11, the line mould that the line line wave of the phase containing failure is mutually constituted with non-faulting respectively
Traveling wave carries out wavelet transformation, the first modulus maximum after obtaining wavelet transformation, further according to the first modulus maximum to phase containing failure
Line line wave be normalized with the line line wave that non-faulting is mutually constituted, according to principle of stacking, after normalization
The line line wave of the phase containing failure and the line line wave that mutually constitutes of non-faulting after normalization obtain the folded of only faults point information
Bonus point amount is not required to data storage, alignment of data to not need regular link in carrying out ranging process and be overlapped recorder data,
Reduce and the combined floodgate of power grid is impacted, wherein it is as shown in Figure 6 that fault point is superimposed component network.
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
For wave at the time of the first modulus maximum of the superposition component of fault point corresponds to, v indicates three-phase voltage traveling wave or three-phase current traveling wave
Line 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 wave velocity of i.e. first fault point back wave arrival time and line line wave, can calculate and be out of order at the time of modulus maximum corresponds to
Accurate distance between point and measurement point.So as to be quickly and accurately positioned fault point, mitigates line walking burden, be conducive to accelerate
Trouble hunting with restore electricity, reduce power failure bring loss, and fault localization result not by line branch point, transition resistance,
System operation mode variation and the influence of load, meanwhile, fault localization does not need additionally to install injection device additional, and hardware investment is few,
Voltage traveling wave and current traveling wave are applicable in, it is applied widely, and do not need regular link and be overlapped recorder data, to power grid
Impact it is small, have good practical performance and economic performance.
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. 7 etc.
The 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 line branch point
That is wave impedance discontinuity point, F point are fault point, and R is transition resistance, and singlephase earth fault, the model and ginseng of route occur for route
Number is as shown in table 1 respectively, and the power parameter of route 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
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 of measurement point acquisitiona、Ub、Uc, as shown in Figure 8.Failure choosing is carried out to the three-phase voltage
Phase, determines failure phase and non-faulting phase, and carries out phase-model transformation processing to three-phase voltage, obtains that three-phase voltage traveling wave is corresponding to be contained
The line line wave that the line line wave of failure phase is mutually constituted with non-faulting, as shown in Figure 9.
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,
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 parameter, and k is data point, and η is construction coefficient.
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 11,
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.
According still further to following formula, the line line wave of the phase containing failure and non-faulting are mutually constituted respectively line line wave into
Row normalized, 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 reclosing superposition component, as shown in Figure 10,
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 12.
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
For wave at the time of the first modulus maximum of the superposition component of fault point corresponds to, v indicates three-phase voltage traveling wave or three-phase current traveling wave
Line mould wave velocity.
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 distance-finding method 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 distance-finding method of transmission line of electricity, be suitable for the transmission line of electricity occur after single-phase fault reclosing device into
Row reclosing characterized by comprising
The reclosing three-phase voltage traveling wave or three-phase current traveling wave are acquired in measurement point；
According to the three-phase voltage traveling wave or the three-phase current traveling wave, the line line wave and non-faulting phase structure of the phase containing failure are constructed
At line line wave；
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；
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.
2. the fault distance-finding method of transmission line of electricity according to claim 1, which is characterized in that described according to the three-phase electricity
Press traveling wave or the three-phase current traveling wave, the step for the line line wave that the line line wave and non-faulting of generation phase containing failure are mutually constituted
Suddenly, it specifically includes:
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.
3. the fault distance-finding method of transmission line of electricity according to claim 2, which is characterized in that
Phase-model transformation processing is carried out to the three-phase voltage traveling wave or the three-phase current traveling wave by following formula, is connected with a
For ground short circuit:
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.
4. the fault distance-finding method of transmission line of electricity according to claim 1, which is characterized in that described to contain failure according to
The line line wave that the line line wave of phase is mutually constituted with the non-faulting determines and is overlapped brake cable line wave in the superposition component of fault point
The step of, it specifically includes:
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.
5. the fault distance-finding method of transmission line of electricity according to claim 4, which is characterized in that
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 by following formula
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.
6. the fault distance-finding method of transmission line of electricity according to claim 4, which is characterized in that
Determine the coincidence brake cable line wave in the superposition component of fault point by following formula:
Wherein,Indicate the coincidence brake cable line wave in the superposition component of fault point.
7. the fault distance-finding method of transmission line of electricity according to claim 5, which is characterized in that described respectively to described containing event
Before the step of line line wave of barrier phase is normalized with the line line wave that the non-faulting is mutually constituted, further includes:
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.
8. the fault distance-finding method of transmission line of electricity according to claim 7, which is characterized in that
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 by following formula
Wavelet transformation:
Wherein, f (n) indicates that the line line wave that the line line wave of the phase containing failure or the non-faulting are mutually constituted, n are sampling
Point,Indicate the approximation component of jth scale,Indicate the Wavelet Component of jth scale, h (k), g (k) indicate filtering
Device parameter, j are scale parameter, and k is data point, and η is construction coefficient.
9. the fault distance-finding method of transmission line of electricity according to claim 8, which is characterized in that
Modulus maximum after determining wavelet transformation by following formula:
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 distance-finding method of transmission line of electricity according to any one of claim 1 to 9, which is characterized in that
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
Brake cable line wave is overlapped at the time of the first modulus maximum of the superposition component of fault point corresponds to, v indicates the three-phase voltage row
The line mould wave velocity of wave or the three-phase current traveling wave.
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