CN107807308A - A kind of transmission line travelling wave velocity of wave self-learning method and traveling wave ranging device - Google Patents
A kind of transmission line travelling wave velocity of wave self-learning method and traveling wave ranging device Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a kind of transmission line travelling wave velocity of wave self-learning method and traveling wave ranging device, comprise the following steps：Step 1, make j=0 and initialize traveling wave speed v0；Step 2, when transmission line of electricity occur disturbance event when, traveling wave speed v is calculated according to the various combination of circuit both sides traveling wave information respectivelyj,1、vj,2、vj,3；Step 3, judge traveling wave speed vj,1、vj,2、vj,3The reasonability of calculated value, and by rational traveling wave speed calculated value and traveling wave speed vj‑1It is weighted averagely, obtains new self study traveling wave speed vj.The measurement of traveling wave speed and the study of traveling wave speed can be realized automatically, reach the purpose of the optimal equivalent traveling wave speed of Step wise approximation.
Description
Technical field
The present invention relates to a kind of transmission line travelling wave velocity of wave self-learning method and traveling wave ranging device.
Background technology
The extensive use in power system of transmission line travelling wave distance-finding method, its fault localization precision are better than impedance on the whole
Method ranging, but there is also range error problem caused by line length parameter error, traveling wave speed inaccuracy：Firstly, for not
Circuit with voltage class, different line style line footpaths, the transmission speed of traveling wave have differences, using fixed experience velocity of wave
Value will necessarily introduce range error.In addition, transmission line length generally provides in the way of overhead line structures horizontal range sum, and
It has ignored the influence factor of the depth displacement of shaft tower, the sag of wire and sag with seasonal variations, the transmission line length provided
There is unknown deviation between the physical length of wire.
Therefore, for given transmission line length, the equivalent velocity of wave of traveling wave is certainly less than reality of the traveling wave along wire transmission
Border velocity of wave, but its accurate equivalent value of wave speed is difficult to obtain.In addition, enter pedestrian based on a small number of transmission line malfunction data several times
Work point analyses traveling wave speed, and not only process is cumbersome, and by few, the random time synchronization error of sample data and the shadow of measurement error
Ring, the traveling wave speed value manually obtained is also difficult to reach higher precision.
The content of the invention
In view of the above-mentioned problems, the present invention provides a kind of transmission line travelling wave velocity of wave self-learning method and traveling wave ranging device,
The measurement of traveling wave speed and the study of traveling wave speed can be realized automatically, reach the mesh of the optimal equivalent traveling wave speed of Step wise approximation
's.
To realize above-mentioned technical purpose and the technique effect, the present invention is achieved through the following technical solutions：
A kind of transmission line travelling wave velocity of wave self-learning method, comprises the following steps：
Step 1, make j=0 and initialize traveling wave speed v0；
Step 2, when transmission line of electricity occur disturbance event when, make j value add 1, according to the difference of circuit both sides traveling wave information
Combination calculates traveling wave speed v respectivelyj,1、vj,2、vj,3, note circuit both sides are respectively M sides and N sides, then：
(1) for operation or fault disturbance event, traveling wave speed v outside areaj,1It is calculated by both sides traveling wave information, traveling wave
Velocity of wave vj,2It is calculated by M skidding ripple information, traveling wave speed vj,3It is calculated by N skidding ripple information；
(2) for troubles inside the sample space disturbance event, traveling wave speed vj,1By both sides traveling wave information and both sides reflected traveling wave information meter
Obtain, traveling wave speed vj,2Reflected traveling wave information is surveyed by both sides traveling wave information and M to be calculated, traveling wave speed vj,3By two skiddings
Ripple information and N survey reflected traveling wave information and are calculated；
(3) disturbance event, v are overlapped after being tripped for transient faultj,1It is calculated by both sides traveling wave information, vj,2
It is calculated by M skidding ripple information, vj,3It is calculated by N skidding ripple information；
Step 3, the reasonability for judging above-mentioned each traveling wave speed calculated value, and by rational traveling wave speed calculated value and traveling wave
Velocity of wave vj-1It is weighted averagely, obtains new self study traveling wave speed vj。
It is preferred that for 110kV and above overhead transmission line, v0Span is 290~300m/ μ s.
It is preferred that the reasonable criterion of traveling wave speed calculated value is：
|vj,x-v0|<Δ v, wherein, x=1,2,3, Δ v is traveling wave speed deviation threshold.
It is preferred that the traveling wave speed Weighted Average Algorithm for traveling wave speed self study is：
vj=kvh+(1-k)vj-1
Wherein, weight factor k ∈ (0,1), when rational traveling wave speed calculated value only has one, vhFor the rational row
Ripple velocity of wave calculated value；When rational traveling wave speed calculated value is more than or equal to two, vhCalculated for all rational traveling wave speeds
The weighted average of value, Weighted Average Algorithm are：
vh=h1vj,1+h2vj,2+h3vj,3
Wherein, h1、h2、h3To weight weight, for invalid wave speed measurement value vj,x, corresponding weight is zero.
It is preferred that weight factor k takes fixed value, or weight factor k to be assigned according to the different situations of this calculating traveling wave speed
Give different weights.
It is preferred that when weight factor k assigns different weights according to the different situations of this calculating traveling wave speed, specifically
For：
(1) if this has to the 1 traveling wave speed result of calculation reasonably based on both-end traveling wave information, weight is assigned
k1；
(2) if this has to the 1 reasonably traveling wave speed result of calculation based on single-ended traveling wave information, weight is assigned
k2；
(3) if this has to 2 reasonably traveling wave speed result of calculations based on single-ended traveling wave or both-end traveling wave information,
Then assign weight k3；
(4) if this has to 3 reasonably based on single-ended or both-end traveling wave information traveling wave speed result of calculation, assign
Give weight k4；
Wherein, weight coefficient relation is：0 ＜ k1＜ k2＜ k3＜ k4＜ 1.
It is preferred that if line length is L, traveling wave caused by the disturbance event is respectively at the time of reaching circuit M, N side for the first time
Tm1, tn1, initial traveling wave are respectively tm2, tn2 at the time of arriving again at circuit M, N side through the reflection of M, N side bus, then：
(1) for outside area operation or fault disturbance event, then 3 calculating traveling wave speeds formula be respectively：
(2) for troubles inside the sample space disturbance event, then the formula of 3 calculating traveling wave speeds are respectively：
(3) disturbance event is overlapped after being tripped for transient fault, then the formula of 3 calculating traveling wave speeds is respectively：
It is preferred that traveling wave speed deviation threshold Δ v=pv0, p spans are 1%~2%.
A kind of transmission line travelling wave range unit, including data processing unit, in addition to traveling wave speed self study unit, institute
State traveling wave speed self study unit and traveling wave speed v is obtained using the self-learning method described in above-mentioned any onej, at the data
The traveling wave speed v that reason unit calculates according to traveling wave speed self study unitjSingle-ended or both-end traveling wave fault location is carried out, formula is such as
Under：
x1=0.5 (tm2-tm1) vj
x2=L-0.5 (tn2-tn1) vj
x3=0.5L+0.5 (tm1-tn1) vj
Wherein, it is respectively tm1, tn1 at the time of trouble point traveling wave reaches circuit M, N side for the first time, initial traveling wave is through trouble point
Reflection is respectively tm2, tn2 at the time of arrive again at circuit M, N side, x1For the Single Terminal Traveling Wave Fault Location result of M sides, x2For the list of N sides
Hold travelling wave ranging result, x3For both-end travelling wave ranging result；Then final fault distance γ is：
γ=q1x1+q2x2+q3x3
Wherein, q1、q2、q3To weight weight, for invalid travelling wave ranging result, its corresponding weight is zero.
The beneficial effects of the invention are as follows：
Using transmission line travelling wave velocity of wave self-learning method of the present invention, can progressively be learnt by oneself based on initial traveling wave speed parameter
Acquistion, so as to adapt to the transmission line of electricity of different voltage class, different line style line footpaths, is kept away to more accurate traveling wave speed
Exempt to fix travelling wave ranging error caused by experience velocity of wave mode.Using the present invention, can also be disappeared with the equivalent traveling wave speed of actual measurement
Except range error caused by transmission line length parameter error, so as to improve range accuracy.Range unit is using automatic study ripple
The mode of speed, it can not only avoid manually calculating traveling wave speed and issue the cumbersome procedure of traveling wave speed definite value, and can lead to
Cross the automatic purpose for progressively accumulating traveling wave speed sample, reaching the optimal equivalent traveling wave speed of Step wise approximation.
Brief description of the drawings
Disturbance or traveling wave schematic diagram during failure outside Tu1Wei areas；
Traveling wave schematic diagram when Fig. 2 is troubles inside the sample space；
Fig. 3 is transient fault reclosing traveling wave schematic diagram (opposite end closure)；
Fig. 4 is transient fault reclosing traveling wave schematic diagram (opposite end disconnection).
Embodiment
Technical solution of the present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings, so that ability
The technical staff in domain can be better understood from the present invention and can be practiced, but illustrated embodiment is not as the limit to the present invention
It is fixed.
A kind of transmission line travelling wave velocity of wave self-learning method, comprises the following steps：
Step 1, make j=0 and initialize traveling wave speed v0；
Step 2, when transmission line of electricity occur disturbance event when, such as, in the area outside operate or fault disturbance event, area
Disturbance event etc. is overlapped after internal fault disturbance event and transient fault tripping operation, makes j value add 1, and according to circuit two
The various combination of skidding ripple information is respectively adopted formula and calculates traveling wave speed vj,1、vj,2、vj,3, note circuit both sides be respectively M sides and
N sides, then：
(1) for operation or fault disturbance event, traveling wave speed v outside areaj,1It is calculated by both sides traveling wave information, traveling wave
Velocity of wave vj,2It is calculated by M skidding ripple information, traveling wave speed vj,3It is calculated by N skidding ripple information；
(2) for troubles inside the sample space disturbance event, velocity of wave v is calculatedj,1、vj,2、vj,3The initial traveling wave information in both sides has been used,
In addition, vj,1The reflected traveling wave information of both sides, v are also usedj,2Use M and survey reflected traveling wave information, vj,3N sides are used
Reflected traveling wave information, namely：Traveling wave speed vj,1It is calculated by both sides traveling wave information and both sides reflected traveling wave information, traveling wave ripple
Fast vj,2Reflected traveling wave information is surveyed by both sides traveling wave information and M to be calculated, traveling wave speed vj,3Surveyed by both sides traveling wave information and N anti-
Traveling wave information is penetrated to be calculated；
(3) disturbance event, v are overlapped after being tripped for transient faultj,1It is calculated by both sides traveling wave information, vj,2By M sides
Traveling wave information is calculated, vj,3It is calculated by N skidding ripple information；
Step 3, the reasonability for judging above-mentioned each traveling wave speed calculated value, and by rational traveling wave speed calculated value and traveling wave
Velocity of wave vj-1It is weighted averagely, obtains new self study traveling wave speed vj, new self study velocity of wave is used for later traveling wave event
Hinder ranging.
It is preferred that for 110kV and above overhead transmission line, v0Span is 290~300m/ μ s, right
Answer, the reasonable criterion of traveling wave speed calculated value is：
|vj,x-v0|<Δ v, wherein, x=1,2,3, Δ v is traveling wave speed deviation threshold, traveling wave speed deviation threshold Δ v
=pv0, p spans are 1%~2%.Work as v0When being taken as 295m/ μ s, Δ v spans are 2.95~5.90m/ μ s, if this
The value of wave speed of secondary calculating meets the criterion, then the velocity of wave is used for into follow-up velocity of wave weighted average calculation, otherwise, abandons this meter
The value of wave speed of calculation or be set to it is invalid.
Traveling wave speed Weighted Average Algorithm for traveling wave speed self study is：
vj=kvh+(1-k)vj-1
Wherein, weight factor k ∈ (0,1), when rational traveling wave speed calculated value only has one, vhFor the rational row
Ripple velocity of wave calculated value；When rational traveling wave speed calculated value is more than or equal to two, vhCalculated for all rational traveling wave speeds
The weighted average of value, Weighted Average Algorithm are：
vh=h1vj,1+h2vj,2+h3vj,3
Wherein, h1、h2、h3To weight weight, for invalid wave speed measurement value vj,x, corresponding weight is zero.
It is preferred that the traveling wave speed result that single-ended traveling wave information obtains takes larger weight, because single-ended traveling wave information
When do not influenceed by circuit both sides clock synchronism deviation.
Weight factor k can take fixed value, for example, taking k=0.5 to realize that this is averaged with previous equal weight.Weight
Factor k can also assign different weights according to the different situations of this calculating traveling wave speed, such as：
When weight factor k assigns different weights according to the different situations of this calculating traveling wave speed, it is specially：
(1) if this has to the 1 traveling wave speed result of calculation reasonably based on both-end traveling wave information, weight is assigned
k1；
(2) if this has to the 1 reasonably traveling wave speed result of calculation based on single-ended traveling wave information, weight is assigned
k2；
(3) if this has to 2 reasonably traveling wave speed result of calculations based on single-ended traveling wave or both-end traveling wave information,
Then assign weight k3；
(4) if this has to 3 reasonably based on single-ended or both-end traveling wave information traveling wave speed result of calculation, assign
Give weight k4；
Wherein, weight coefficient relation is：0 ＜ k1＜ k2＜ k3＜ k4＜ 1.
When rational traveling wave speed calculated value only has one, vhFor the rational traveling wave speed calculated value；When rational
When traveling wave speed calculated value is more than or equal to two, vhFor the weighted average of all rational traveling wave speed calculated values.Wherein, it is right
In the situation for there are multiple traveling wave speed result of calculations for meeting reasonable velocity of wave criterion, can be obtained using average weighted mode
vh, weight can mean allocation, the weight of the traveling wave speed result obtained based on single-ended traveling wave information can be also increased, because only
Do not influenceed when being applicable single-ended traveling wave information by circuit both sides clock synchronism deviation.
If line length is L, traveling wave caused by the disturbance event be respectively at the time of reaching circuit M, N side for the first time tm1,
Tn1, initial traveling wave are respectively tm2, tn2 at the time of arriving again at circuit M, N side through the reflection of M, N side bus, then：
(1) for operation or fault disturbance event outside area, as shown in Figure 1, if disturbance point or trouble point are close to M outside area
Side, traveling wave caused by the disturbance or failure are respectively tm1, tn1 at the time of reaching circuit M, N side for the first time, and initial traveling wave is through M, N side
Bus reflection is respectively tm2, tn2 at the time of arriving again at circuit M, N side, then can have the formula of 3 calculating velocities of wave：
Wherein, first equation is based on both-end traveling wave information, and second and the 3rd equation are based on single-ended traveling wave information.
In the case that fault traveling wave amplitude is smaller, bus reflection is weaker or line condition is more complicated, reflection wave head is likely difficult to identify, the
Two and the 3rd equation may be single or failed.
(2) for troubles inside the sample space disturbance event, as shown in Figure 2, if fault traveling wave reaches circuit M, N side for the first time
Respectively tm1, tn1, initial traveling wave are respectively tm2, tn2 at the time of arriving again at circuit M, N side through bus and failure point reflection,
Can then there is the formula of 3 calculating velocities of wave：
Wherein, first equation is based on single-ended traveling wave information, is not influenceed in theory by circuit both sides time synchronized deviation,
Second and the 3rd equation are the methods that single-ended, both-end traveling wave information combines, and computational accuracy and circuit both sides time synchronized are inclined
Difference is relevant.
(3) disturbance event is overlapped after being tripped for transient fault, as shown in accompanying drawing 3 and accompanying drawing 4, if the close M sides of the point that closes a floodgate,
Traveling wave caused by the disturbance or failure is respectively tm1, tn1 at the time of reaching circuit M, N side for the first time, and initial traveling wave is female through M, N side
Line reflection is respectively tm2, tn2 at the time of arriving again at circuit M, N side, then can have the formula of 3 calculating velocities of wave：
As shown in Figure 3, when M sides, protection device is first closed a floodgate, then when N side lines circuit breaker is off, N sides device
Traveling wave is can't detect, now only second equation is effective；As shown in Figure 4, closed a floodgate after the protection device of M sides, now N side lines road
When breaker is in closure state, first and second and three equation it is effective in theory；But when combined floodgate traveling wave amplitude is smaller, bus is anti-
Penetrate in the case that weaker or line condition is more complicated, reflection wave head is likely difficult to identify, second and the 3rd equation may be singly
It is individual or fail.The all of above circuit opposite end traveling wave due in used can be exchanged automatically by device by communication port
Data obtain.
Accordingly, a kind of transmission line travelling wave range unit, including data processing unit, in addition to traveling wave speed self study
Unit, the traveling wave speed self study unit obtain traveling wave speed v using the self-learning method described in above-mentioned any onej, institute
State the traveling wave speed v that data processing unit calculates according to traveling wave speed self study unitjSingle-ended or both-end traveling wave fault is carried out to survey
Away from as shown in Figure 2, calculation formula is as follows：
x1=0.5 (tm2-tm1) vj
x2=L-0.5 (tn2-tn1) vj
x3=0.5L+0.5 (tm1-tn1) vj
Wherein, it is respectively tm1, tn1 at the time of trouble point traveling wave reaches circuit M, N side for the first time, initial traveling wave is through trouble point
Reflection is respectively tm2, tn2 at the time of arrive again at circuit M, N side, x1For the Single Terminal Traveling Wave Fault Location result of M sides, x2For the list of N sides
Hold travelling wave ranging result, x3For both-end travelling wave ranging result, for multiple travelling wave ranging results, average weighted method can be used
Final fault localization result γ is calculated, formula is as follows：
γ=q1x1+q2x2+q3x3
Wherein, q1、q2、q3To weight weight, for invalid travelling wave ranging result, its corresponding weight is zero.
The present invention is realized automatically by traveling wave ranging device, can reach raising travelling wave ranging by improving traveling wave speed precision
The purpose of precision.This method is based on default initial traveling wave speed in device, when operation or failure, area outside transmission line of electricity generating region
After internal fault, transient fault tripping operation during the disturbance event such as coincidence, traveling wave ranging device synthesis is entered using single-ended, both-end traveling wave information
Every trade ripple velocity of wave calculates, and judges the reasonability of traveling wave speed calculated value, and by rational traveling wave speed calculated value with learning before
To traveling wave speed be weighted average, obtain new self study velocity of wave, new self study velocity of wave is used for later traveling wave therefore
Hinder ranging.So as to adapt to the transmission line of electricity of different voltage class, different line style line footpaths, avoid fixing experience velocity of wave mode
Caused travelling wave ranging error.Using the present invention, the equivalent traveling wave speed of actual measurement can also be used to eliminate transmission line length parameter
Range error caused by error, so as to improve range accuracy.Range unit can not only be kept away by the way of study velocity of wave automatically
Manpower-free calculates traveling wave speed and issues the cumbersome procedure of traveling wave speed definite value, and can be by progressively accumulating traveling wave ripple automatically
Fast sample, reach the purpose of the optimal equivalent traveling wave speed of Step wise approximation.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure that bright specification and accompanying drawing content are made either equivalent flow conversion or to be directly or indirectly used in other related
Technical field, be included within the scope of the present invention.
Claims (9)
1. a kind of transmission line travelling wave velocity of wave self-learning method, it is characterised in that comprise the following steps：
Step 1, make j=0 and initialize traveling wave speed v0；
Step 2, when transmission line of electricity occur disturbance event when, make j value add 1, according to the various combination of circuit both sides traveling wave information
Traveling wave speed v is calculated respectivelyj,1、vj,2、vj,3, note circuit both sides are respectively M sides and N sides, then：
(1) for operation or fault disturbance event, traveling wave speed v outside areaj,1It is calculated by both sides traveling wave information, traveling wave speed
vj,2It is calculated by M skidding ripple information, traveling wave speed vj,3It is calculated by N skidding ripple information；
(2) for troubles inside the sample space disturbance event, traveling wave speed vj,1Calculated by both sides traveling wave information and both sides reflected traveling wave information
Arrive, traveling wave speed vj,2Reflected traveling wave information is surveyed by both sides traveling wave information and M to be calculated, traveling wave speed vj,3Believed by both sides traveling wave
Breath and N survey reflected traveling wave information and are calculated；
(3) disturbance event, v are overlapped after being tripped for transient faultj,1It is calculated by both sides traveling wave information, vj,2By M skidding ripples
Information is calculated, vj,3It is calculated by N skidding ripple information；
Step 3, the reasonability for judging above-mentioned each traveling wave speed calculated value, and by rational traveling wave speed calculated value and traveling wave speed
vj-1It is weighted averagely, obtains new self study traveling wave speed vj。
2. a kind of transmission line travelling wave velocity of wave self-learning method according to claim 1, it is characterised in that for 110kV
And above overhead transmission line, v0Span is 290~300m/ μ s.
A kind of 3. transmission line travelling wave velocity of wave self-learning method according to claim 2, it is characterised in that traveling wave speed meter
The reasonable criterion of calculation value is：
|vj,x-v0|<Δ v, wherein, x=1,2,3, Δ v is traveling wave speed deviation threshold.
4. a kind of transmission line travelling wave velocity of wave self-learning method according to claim 1, it is characterised in that for traveling wave ripple
The traveling wave speed Weighted Average Algorithm of fast self study is：
vj=kvh+(1-k)vj-1
Wherein, weight factor k ∈ (0,1), when rational traveling wave speed calculated value only has one, vhFor the rational traveling wave ripple
Fast calculated value；When rational traveling wave speed calculated value is more than or equal to two, vhFor all rational traveling wave speed calculated values
Weighted average, Weighted Average Algorithm are：
vh=h1vj,1+h2vj,2+h3vj,3
Wherein, h1、h2、h3To weight weight, for invalid wave speed measurement value vj,x, corresponding weight is zero.
A kind of 5. transmission line travelling wave velocity of wave self-learning method according to claim 4, it is characterised in that weight factor k
Fixed value, or weight factor k is taken to assign different weights according to the different situations of this calculating traveling wave speed.
6. a kind of transmission line travelling wave velocity of wave self-learning method according to claim 5, it is characterised in that work as weight factor
When k assigns different weights according to the different situations of this calculating traveling wave speed, it is specially：
(1) if this has to the 1 traveling wave speed result of calculation reasonably based on both-end traveling wave information, weight k is assigned1；
(2) if this has to the 1 reasonably traveling wave speed result of calculation based on single-ended traveling wave information, weight k is assigned2；
(3) if this has to 2 reasonably traveling wave speed result of calculations based on single-ended traveling wave or both-end traveling wave information, assign
Give weight k3；
(4) if this has to 3 reasonably based on single-ended or both-end traveling wave information traveling wave speed result of calculation, power is assigned
Weight k4；
Wherein, weight coefficient relation is：0 ＜ k1＜ k2＜ k3＜ k4＜ 1.
7. a kind of transmission line travelling wave velocity of wave self-learning method according to claim 1, it is characterised in that set line length
For L, traveling wave caused by the disturbance event is respectively tm1, tn1 at the time of reaching circuit M, N side for the first time, and initial traveling wave is through M, N side
Bus reflection is respectively tm2, tn2 at the time of arrive again at circuit M, N side, then：
(1) for outside area operation or fault disturbance event, then 3 calculating traveling wave speeds formula be respectively：
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<mi>t</mi>
<mi>n</mi>
<mn>1</mn>
</mrow>
</mfrac>
<mo>,</mo>
<msub>
<mi>v</mi>
<mrow>
<mi>j</mi>
<mo>,</mo>
<mn>2</mn>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<mi>L</mi>
<mrow>
<mi>t</mi>
<mi>m</mi>
<mn>2</mn>
<mo>-</mo>
<mn>2</mn>
<mi>t</mi>
<mi>m</mi>
<mn>1</mn>
<mo>+</mo>
<mi>t</mi>
<mi>n</mi>
<mn>1</mn>
</mrow>
</mfrac>
<mo>,</mo>
<msub>
<mi>v</mi>
<mrow>
<mi>j</mi>
<mo>,</mo>
<mn>3</mn>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
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<mo>+</mo>
<mi>t</mi>
<mi>m</mi>
<mn>1</mn>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
(3) disturbance event is overlapped after being tripped for transient fault, then the formula of 3 calculating traveling wave speeds is respectively：
<mrow>
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</mrow>
</mfrac>
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</mrow>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mn>2</mn>
<mi>L</mi>
</mrow>
<mrow>
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<mi>t</mi>
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</mrow>
</mfrac>
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<mo>,</mo>
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</mrow>
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<mo>=</mo>
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</mrow>
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</mrow>
8. a kind of transmission line travelling wave velocity of wave self-learning method according to claim 3, it is characterised in that traveling wave speed is inclined
Poor threshold Δ v=pv0, p spans are 1%~2%.
9. a kind of transmission line travelling wave range unit, including data processing unit, it is characterised in that also learnt by oneself including traveling wave speed
Unit is practised, the traveling wave speed self study unit obtains traveling wave using the self-learning method described in claim 1-9 any one
Velocity of wave vj, traveling wave speed v that the data processing unit calculates according to traveling wave speed self study unitjCarry out single-ended or both-end row
Ripple fault localization, formula are as follows：
x1=0.5 (tm2-tm1) vj
x2=L-0.5 (tn2-tn1) vj
x3=0.5L+0.5 (tm1-tn1) vj
Wherein, it is respectively tm1, tn1 at the time of trouble point traveling wave reaches circuit M, N side for the first time, initial traveling wave is through failure point reflection
It is respectively tm2, tn2 at the time of arriving again at circuit M, N side, x1For the Single Terminal Traveling Wave Fault Location result of M sides, x2For the single-ended row of N sides
Ripple distance measurement result, x3For both-end travelling wave ranging result；
Then final fault distance γ is：
γ=q1x1+q2x2+q3x3
Wherein, q1、q2、q3To weight weight, for invalid travelling wave ranging result, its corresponding weight is zero.
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