CN104049179B - Line fault optimized positioning method based on measurement on distributed traveling waves - Google Patents
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Abstract
The invention relates to a line fault optimized positioning method based on measurement on distributed traveling waves. According to the method, fault points are accurately positioned according to different positioning methods on the basis of current traveling wave information collected by a plurality of monitoring terminals distributed on a power transmission line. The method mainly includes the following steps that firstly, the monitoring terminals are distributed at different monitoring points of the line to collect the current traveling wave information; then a fault section where the fault points are located is determined on the basis of the current traveling wave information collected by the different monitoring points; finally, the actual transmission speed of the traveling waves is corrected under the situation of taking sag into consideration, the fault points are accurately positioned according to the different traveling wave positioning methods, and a final optimized positioning result is obtained. Compared with a frequently-used traditional station type traveling wave positioning method, the method reduces influence on positioning accuracy from factors such as sag, wave speed and attenuation distortion of the traveling waves to a great extent, and also has a good application effect in actual projects.
Description
Technical field
The invention belongs to transmission line malfunction is accurately positioned field, more particularly, to a kind of line based on the measurement of distributed traveling wave
Road fault optimum position method.
Background technology
More traditional impedance location technology, traveling wave location technology has the advantages that positioning precision is high, is current location technology
The focus of research, applies in engineering simultaneously on a large scale in practice.In engineering, adopt is installed in the transformer station of two ends more at present
Monitoring device, using both-end method fault point, but due in the transmitting procedure of distance traveling wave serious decay can occur
With distortion easily cause wave head identification inaccurate, meanwhile, by the shadow of the factors such as topography and geomorphology, weather conditions and system operation mode
Ring traveling wave actual transmission speed and be less than the theoretical derivation value light velocity, stand and use formula both-end positioning mode precision and accuracy rate often not
Height, considerably increases fault line walking time and power off time, causes huge directly or indirectly economic loss.In consideration of it, being badly in need of
A kind of high accuracy and the travelling wave positioning method of accuracy rate.
Content of the invention
In order to break away from current predicament, a kind of line fault optimum position side based on the measurement of distributed traveling wave of the present invention
Method, decreases decay and the distortion of traveling wave based on the distributed current traveling wave information installing monitoring device collection；Consider row
Ripple actual transmissions velocity of wave and the impact of line-sag, are accurately positioned fault using recurrence both-end method step by step and the single-ended method of coherent superposition
Point, last optimum position result, obtain final positioning result.
A kind of line fault optimum position method based on the measurement of distributed traveling wave of the present invention, specific technical scheme is such as
Under：
First, distributed capture electric transmission line current traveling-wave information；Every L1Kilometer selects a monitoring point, in selected prison
Measuring point distributed installation monitoring device, each monitoring point A, B, C three-phase is respectively mounted a monitoring device, and each monitoring terminal is adopted
The current traveling wave information of collection includes current traveling wave waveform and collection moment, wherein 10≤L1≤15.
Secondly, the affiliated fault section of failure judgement point；The affiliated fault section in trouble point refers to that the position of trouble point is located at two
Region between individual adjacent monitoring point, failure judgement point affiliated fault section principle：Two neighboring monitoring point gathers in-phase current
The opposite polarity of traveling wave main ripple wave head.
Then it is considered to line-sag, check current traveling wave actual transmission speed；Often adjacent two-stage shaft tower is considering sag
In the case of, calculate the transmission line length of often adjacent shaft tower span, the transmission line length of certain adjacent shaft tower span of calculating is made
Equivalent span for this adjacent shaft tower；Current traveling wave actual transmission speed v=2L2/ t, wherein L2For certain monitoring point to certain transformer station
Transmission line length, t is the current traveling wave and this monitoring after this transformer station's first reflection collecting this monitoring point first time
The current traveling wave time difference of point collection.
Next it is utilized respectively recurrence both-end method and the single-ended method of coherent superposition step by step and be accurately positioned trouble point；Recurrence is double step by step
Hold-carrying, first according to the affiliated fault section in trouble point determining, is selected each monitoring point in trouble point both sides and is made both-end positioning, therefore
Barrier point both sides respectively select the principle of a monitoring point as follows：On the left of distance fault point, the first near monitoring point gathers current traveling wave
Time respectively with distance fault point on the right side of first near, second near ..., the n-th near monitoring point gather the when catch cropping of current traveling wave
Difference, on the left of distance fault point the second near monitoring point gather time of current traveling wave respectively with distance fault point on the right side of first near,
Second near ..., the n-th near monitoring point gather current traveling wave when catch cropping poor, the rest may be inferred, on the left of distance fault point
Remote monitoring point gather time of current traveling wave respectively with distance fault point on the right side of first near, second near ..., the n-th near prison
The when catch cropping difference that measuring point gathers current traveling wave completes, and selects monitoring point on the left of one group of trouble point to gather time and the event of current traveling wave
Barrier point right side monitoring point gathers the difference absolute value minima of the time of current traveling wave；Two of homophase are supervised by the single-ended method of coherent superposition
The current traveling wave surveying terminal is overlapped on the basis of each autonomous ripple wave head, and coherent superposition method is divided into two types, the first species
Type is the current traveling wave superposition using the two monitoring terminal collections of trouble point the same side homophase, and second type is superposition trouble point
The current traveling wave of two monitoring terminal collections of both sides homophase.
The last trouble point according to recurrence both-end method and the single-ended method of coherent superposition step by step is accurately positioned result, preferably finally event
Barrier point is accurately positioned result；The principle that preferably final trouble point is accurately positioned result is as follows：If trouble point is near a certain monitoring point,
In the positioning result using the single-ended method of coherent superposition, then select the most result of confirmation number of times as final positioning result, if
Trouble point not close to a certain monitoring point, then selects the most knot of confirmation number of times in using the positioning result of recurrence both-end method step by step
Fruit is as final positioning result.
Brief description
A kind of line fault optimum position method flow diagram based on the measurement of distributed traveling wave of Fig. 1
Fig. 2 recurrence both-end legal position schematic diagram step by step
The first trouble point homonymy homophase two terminal coherent superposition single-ended legal position schematic diagram of Fig. 3
Fig. 4 second trouble point homonymy homophase two terminal coherent superposition single-ended legal position schematic diagram
Fig. 5 trouble point both sides homophase two terminal coherent superposition single-ended legal position schematic diagram
Specific embodiment
In order to be better understood from a kind of line fault optimum position method based on the measurement of distributed traveling wave of the present invention, in conjunction with
Relevant indicators are described further.
Fig. 1 is a kind of line fault localization method flow chart based on the measurement of distributed traveling wave of the present invention.
Implementation steps S1 distributed capture electric transmission line current traveling-wave information first.
When implementing this step, need, in transmission line of electricity, monitoring device is installed, the installation principle of monitoring device is as follows：Every L1Public
In select a monitoring point, in the distributed installation in selected monitoring point monitoring device, each monitoring point A, B, C three-phase is respectively mounted
One monitoring device, the current traveling wave information of each monitoring terminal collection includes current traveling wave waveform and gathers the moment, and wherein 10
≤L1≤15.Monitoring device is made an uproar by high potential coupling energy taking power module, travelling wave current acquisition module, GPS timing module, shielding
Sound module, data memory module data transport module etc. form, and gather current traveling wave waveform with Luo-coil, using GPS
The moment of timing module record current traveling wave collection.
Secondly the affiliated fault section of implementation steps S2 failure judgement point.
When implementing this step, the affiliated fault section in trouble point refers to that the position of trouble point is located between two adjacent monitoring points
Region, failure judgement point affiliated fault section principle：Two neighboring monitoring point gathers the pole of in-phase current traveling wave main ripple wave head
Property is contrary.As shown in Fig. 2 monitoring point 1 is identical with the polarity of the in-phase current traveling wave main ripple wave head that monitoring point 2 gathers, trouble point
Not between monitoring point 1 and monitoring point 2, the region of monitoring point 1 to monitoring point 2 is not fault section；Monitoring point 3 and monitoring point 4
Collection in-phase current traveling wave main ripple wave head polarity identical, trouble point not between monitoring point 3 and monitoring point 4, monitoring point 3 to
The region of monitoring point 4 is not fault section；The polarity phase of the in-phase current traveling wave main ripple wave head of monitoring point 2 and monitoring point 3 collection
Instead, trouble point is located between monitoring point 2 and monitoring point 3, and the region of monitoring point 2 to monitoring point 3 is fault section.
It is then carried out step S3 and considers line-sag, check current traveling wave actual transmission speed.
When implementing this step, often adjacent two-stage shaft tower, in the case of considering sag, calculates the defeated of every adjacent shaft tower span
Electric line length, the transmission line length of certain adjacent shaft tower span of calculating is as the equivalent span of this adjacent shaft tower；Traveling wave is real
Border transmission speed v=2L/t, wherein L are certain monitoring point to certain transformer station's transmission line length, and t is that this monitoring point gathers for the first time
The current traveling wave time difference that the current traveling wave arriving is gathered with this monitoring point after this transformer station's first reflection.As shown in Fig. 2 with
As a example monitoring point 1, L0It is monitoring point 1 to transformer station A shaft tower span sum, L is that power transformation is arrived in monitoring point 1 in the case of considering sag
Stand the length of A transmission line of electricity, current traveling wave actual transmission speed v=2L/t, t is the electric current that this monitoring point 1 first time collects
The current traveling wave time difference that traveling wave is gathered with this monitoring point after transformer station's A first reflection.
Next implementation steps S4 are utilized respectively recurrence both-end method and the single-ended method of coherent superposition step by step and are accurately positioned trouble point.
When implementing this step, recurrence both-end method, first according to the affiliated fault section in trouble point determining, selects fault step by step
Both-end positioning is made in the point each monitoring point in both sides, and trouble point both sides respectively select the principle of a monitoring point as follows：Distance fault point
The near monitoring point in left side first gather time of current traveling wave respectively with distance fault point on the right side of first near, second near ..., the
The when catch cropping that the near monitoring point of n gathers current traveling wave is poor, and on the left of distance fault point, the second near monitoring point gathers current traveling wave
Time respectively with distance fault point on the right side of first near, second near ..., the n-th near monitoring point gather the when catch cropping of current traveling wave
Difference, the rest may be inferred, monitoring point farthest on the left of distance fault point gather time of current traveling wave respectively with distance fault point
Right side first is near, second near ..., the n-th near monitoring point gather the when catch cropping difference of current traveling wave and complete, select one group of trouble point
Left side monitoring point gather monitoring point on the right side of time and the trouble point of current traveling wave gather current traveling wave time difference absolute value
Little value；The current traveling wave of two monitoring terminals of homophase is folded on the basis of each autonomous ripple wave head by the single-ended method of coherent superposition
Plus, coherent superposition method is divided into two types, and the first type is using the two monitoring terminal collections of trouble point the same side homophase
Current traveling wave is superimposed, and second type is the current traveling wave of two monitoring terminal collections of superposition trouble point both sides homophase.As Fig. 2
Shown, the localization of faults is located between monitoring point 2 and monitoring point 3, and on the left of distance fault point, the first nearly monitoring point 2 collects electric current
The gps time t of traveling wave2Collect the gps time t of current traveling wave respectively with the nearly monitoring point 3 of distance fault point opposite side first3,
Two nearly monitoring points 4 collect the gps time t of current traveling wave4Differ from, on the left of distance fault point, the second nearly monitoring point 1 collects electricity
The gps time t of popular ripple2Collect the gps time t of current traveling wave respectively with the nearly monitoring point 3 of distance fault point opposite side first3、
Second nearly monitoring point 4 collects the gps time t of current traveling wave4Differ from, select two monitoring points of absolute value minimum of difference to make both-end
Positioning, the maximized precision that improve both-end positioning of this both-end method of recurrence step by step；If as shown in figure 3, by trouble point homonymy
The current traveling wave waveform of monitoring point 1 and monitoring point 2 homophase is with respective T1And t1It is overlapped on the basis of wave head, then T after being superimposed2With
t2Wave head overlaps and is strengthened, and recycles the single-ended fault point of current traveling wave waveform after superposition；If as shown in figure 4, will
The travelling wave current waveform of trouble point homonymy monitoring point 1 and monitoring point 2 homophase is with respective T1And t1It is overlapped on the basis of wave head, then
T after superposition3And t3Wave head overlaps and is strengthened, and recycles the single-ended fault point of current traveling wave waveform after superposition；As Fig. 5
Shown, if by the current traveling wave waveform of trouble point heteropleural monitoring point 1 and monitoring point 3 homophase with respective t1And T1Enter on the basis of wave head
Row superposition, then t after being superimposed2And T3Wave head overlaps and is strengthened, and recycles the single-ended positioning failure of current traveling wave waveform after superposition
Point.The purpose being superimposed two monitoring points with the travelling wave current of phase acquisition is to strengthen coherent wave, reduces the interference that noise produces.
Last implementation steps S5 are accurately positioned result according to the trouble point of recurrence both-end method and the single-ended method of coherent superposition step by step,
Preferably final trouble point is accurately positioned result.
When implementing this step, the principle that preferably final trouble point is accurately positioned result is as follows：If trouble point is near a certain prison
Measuring point, then select the most result of confirmation number of times to tie as final positioning in the positioning result using the single-ended method of coherent superposition
Really, if trouble point, not close to a certain monitoring point, selects confirmation number of times in using the positioning result of recurrence both-end method step by step
Many results are as final positioning result.
Claims (5)
1. a kind of line fault optimum position method based on the measurement of distributed traveling wave is it is characterised in that foundation is in transmission line of electricity
The current traveling wave information of multiple monitoring terminal collections of upper distributed arrangement, is accurately positioned fault using different localization methods
Point, specific implementation step is as follows：
Distributed capture electric transmission line current traveling-wave information；
The affiliated fault section of failure judgement point；
Check current traveling wave actual transmission speed；
It is utilized respectively recurrence both-end method and the single-ended method of coherent superposition step by step and be accurately positioned trouble point；
Trouble point according to recurrence both-end method and the single-ended method of coherent superposition step by step is accurately positioned result, and preferably final trouble point is accurate
Positioning result；
Wherein, recurrence both-end method, first according to the affiliated fault section in trouble point determining, selects each one of trouble point both sides step by step
Both-end positioning is made in monitoring point, and trouble point both sides respectively select the principle of a monitoring point as follows：On the left of distance fault point, first is near
Monitoring point gather time of current traveling wave respectively with distance fault point on the right side of first near, second near ..., the n-th near monitoring point
The when catch cropping of collection current traveling wave is poor, on the left of distance fault point the time of the second near monitoring point collection current traveling wave respectively with away from
Close on the right side of trouble point first, second near ..., the n-th near monitoring point gather current traveling wave when catch cropping poor, the rest may be inferred,
On the left of the distance fault point farthest monitoring point gather time of current traveling wave respectively with distance fault point on the right side of first near, the
Two near ..., the n-th near monitoring point gather the when catch cropping difference of current traveling wave and complete, select monitoring point on the left of one group of trouble point to adopt
On the right side of the time of colleeting comb traveling wave and trouble point, monitoring point gathers the difference absolute value minima of the time of current traveling wave；
The current traveling wave of two monitoring terminals of homophase is overlapped on the basis of each autonomous ripple wave head by the single-ended method of coherent superposition,
Coherent superposition method is divided into two types, and the first type is the electric current using the two monitoring terminal collections of trouble point the same side homophase
Traveling wave is superimposed, and second type is the current traveling wave of two monitoring terminal collections of superposition trouble point both sides homophase.
2., according to a kind of line fault optimum position method based on the measurement of distributed traveling wave of claim 1, step is distributed to adopt
Collection electric transmission line current traveling-wave information is it is characterised in that every L1Kilometer selects a monitoring point, distributed in selected monitoring point
Monitoring device is installed, each monitoring point A, B, C three-phase is respectively mounted a monitoring device, the electric current row of each monitoring terminal collection
Ripple information includes current traveling wave waveform and collection moment, wherein 10≤L1≤15.
3. according to a kind of line fault optimum position method based on the measurement of distributed traveling wave of claim 1, step failure judgement
Fault section belonging to point is it is characterised in that the affiliated fault section in trouble point refers to that the position of trouble point is located at two adjacent monitorings
Region between point, failure judgement point affiliated fault section principle：Two neighboring monitoring point gathers in-phase current traveling wave main ripple ripple
The opposite polarity of head.
4., according to a kind of line fault optimum position method based on the measurement of distributed traveling wave of claim 1, step considers circuit
Sag, checks current traveling wave actual transmission speed it is characterised in that often adjacent two-stage shaft tower, in the case of considering sag, is counted
Calculate the transmission line length of often adjacent shaft tower span, the transmission line length of certain adjacent shaft tower span of calculating is as this adjacent stems
The equivalent span of tower；Current traveling wave actual transmission speed v=2L2/ t, wherein L2Long to certain transformer station's transmission line of electricity for certain monitoring point
Degree, t is the electricity of the current traveling wave and collection of this monitoring point after this transformer station's first reflection collecting this monitoring point first time
Popular ripple time difference.
5., according to a kind of line fault optimum position method based on the measurement of distributed traveling wave of claim 1, step is according to step by step
The trouble point of recurrence both-end method and the single-ended method of coherent superposition is accurately positioned result, and preferably final trouble point is accurately positioned result, its
It is characterised by, the principle that preferably final trouble point is accurately positioned result is as follows：If trouble point, near a certain monitoring point, is adopting
The most result of confirmation number of times is selected as final positioning result, if trouble point is not in the positioning result of the single-ended method of coherent superposition
Near a certain monitoring point, then select the most result of confirmation number of times in using the positioning result of recurrence both-end method step by step as
Whole positioning result.
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