CN106569090A - Fault location method and system for cable hybrid power transmission line - Google Patents
Fault location method and system for cable hybrid power transmission line Download PDFInfo
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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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Abstract
The invention provides a fault location method for a cable hybrid power transmission line, which comprises the steps of acquiring the propagation time of fault traveling waves on a first overhead line, a second overhead line and a cable respectively; presetting a plurality of fault traveling wave starting points, and calculating a time difference value formed by the fact that each preset fault traveling wave starting point reaches a first bus and a second bus according to the propagation time of a fault traveling wave on each line; acquiring a time difference value formed when the fault traveling wave actually reaches the first bus and the second bus; and according to the time difference formed between the actual arrival of the fault traveling wave at the first bus and the second bus, determining the actual fault position of the fault traveling wave in the time difference formed between the arrival of each preset fault traveling wave starting point at the first bus and the corresponding second bus, and calculating the distance between the fault position and the first bus and/or the second bus. The invention is suitable for the power transmission line with the complicated multi-section cable overhead line alternately appearing, and can simply and reliably give the distance measurement result.
Description
Technical field
The present invention relates to cable mixed power transmission line FLT field, more particularly to a kind of cable mixing power transmission line
The method and system of road fault localization.
Background technology
With developing rapidly for China's economy, city and small towns power load are continuously increased, traditional overhead transmission line
The demand of China city and small towns electricity consumption development can not be met, main reason is that：On the one hand, the construction meeting of overhead transmission line
Substantial amounts of land resource is taken, is unfavorable for the reasonable utilization of land resource, on the other hand, crisscross overhead transmission line takes city
City builds space, is unfavorable for modern urbanization construction.And power cable is because its is safe and reliable, be conducive to urban modernization construction etc.
Advantage, is applied widely in electrical network, and power circuit also develops into aerial line-cable and mixes by past simple overhead transmission line
Close transmission line of electricity.Therefore, with the differentiation of power circuit structure, the positioning and lookup to feeder line fault proposes higher
Require.
In the prior art, the method that cable-aerial line mixed power transmission line Two-terminal Fault Location is generally adopted is based on
The section fault positioning mode of distributed parameter model and the both-end travelling wave ranging method based on velocity of wave normalizing algorithm.
In the section fault positioning mode based on distributed parameter model, the method is former with symmetrical component method and linear superposition
Fault network is decomposed into before failure and adds positive and negative, zero-sequence network after proper network and failure by reason, then using symmetrical component method
Three-phase voltage Sudden Changing Rate and three-phase current Sudden Changing Rate are transformed into into symmetrical components, the system resistance at circuit first and last end is thus tried to achieve respectively
It is anti-, and then respectively by the electric current on the calculated trouble point transition resistance of electric parameters at circuit first and last end, it is finally first by circuit
Electric current modulus value phase relation on the calculated trouble point transition resistance of electric parameters of end obtains trouble point.Although the method
Dual ended data synchronization is not required, is not affected by circuit two ends system impedance and transition resistance there is no pseudo- root discrimination, and
It is easily achieved, but is only applicable to the relatively simple cable aerial line mixed power transmission line of structure, and it is many for increasingly complex
The section transmission line of electricity that is alternately present of cable aerial line, when fault section is judged, basis for estimation is more complicated, causes the error can be with
Increasing for junction point and increase, making the precision of fault localization reduces.
In the both-end travelling wave ranging method based on velocity of wave normalizing algorithm, the method is long by cable on the basis of aerial line velocity of wave
Degree is converted, and traveling wave spread speed is the wave velocity of aerial line in the circuit after wave velocity normalization, then to velocity of wave normalizing
Circuit after change is calculated, and obtains the position in circuit of the trouble point after velocity of wave normalization, finally changes position of failure point
Calculate the position in actual track.Although for cable aerial line mixed power transmission line, using the double of wave velocity normalization method
End travelling wave ranging is ideal, but is only applied in small current transmission line of electricity, in the joint line of high voltage power transmission also
It is non-verified, need to realize in research work from now on.
The content of the invention
Embodiment of the present invention technical problem to be solved is, there is provided a kind of cable mixed power transmission line fault localization
Method and system, it is adaptable on the transmission line of electricity that complicated multistage cable aerial line is alternately present, can simply, reliably be given
Range measurement.
In order to solve above-mentioned technical problem, a kind of cable mixed power transmission line fault localization is embodiments provided
Method, it is realized on three-stage cable joint line, the cable joint line by the first aerial line, the second aerial line and
The cable being arranged between first aerial line and second aerial line is formed, and first aerial line is also with first
Bus is connected, and second aerial line is also connected with the second bus, and methods described includes：
S1, corresponding length and failed row wavelength-division are distinguished according to first aerial line, the second aerial line and cable
The spread speed on first aerial line, the second aerial line and cable is not corresponded to, the fault traveling wave is obtained right respectively
Should be in the propagation time on first aerial line, the second aerial line and cable；
S2, default multiple fault traveling wave starting points, and corresponded to respectively in the first according to the fault traveling wave for obtaining
In propagation time on ceases to be busy, the second aerial line and cable, calculate each preset failure traveling wave starting point and reach first bus
Time and its correspond to up between the time of second bus formed time difference；Wherein, default multiple events
Barrier traveling wave starting point includes the junction point between first aerial line and first bus, first aerial line and the electricity
The junction point between junction point, the cable and second aerial line and second aerial line and institute between cable
State the junction point between the second bus；
S3, with sometime as initial time, obtain time and arrival that fault traveling wave is actually reached first bus
The time of second bus, and calculate the fault traveling wave and be actually reached between first bus and second bus
The time difference of formation；
S4, according to the fault traveling wave for calculating be actually reached between first bus and second bus formed
Time difference, reach the time of first bus and its correspond in each preset failure traveling wave starting point for calculating and reach
In the time difference formed between the time of second bus, the actually located abort situation of the fault traveling wave is determined, and
Calculate the abort situation and the distance between first bus and/or second bus of the determination.
Wherein, in step S1, " spread speed of the fault traveling wave on first aerial line " with it is " described
Spread speed of the fault traveling wave on second aerial line " is equal.
Wherein, step S2 is specifically included：
When with the junction point between first aerial line and first bus as the default preset failure traveling wave
During starting point, the preset failure traveling wave starting point reach the time of first bus and its correspond to up to second bus when
Between between formed time difference correspond to respectively in first aerial line, the second aerial line and cable equal to the fault traveling wave
Three's propagation time sum takes negative value on line；
When with the junction point between first aerial line and the cable as the default preset failure traveling wave
During point, the preset failure traveling wave starting point reaches the time of first bus and its corresponds to time up to second bus
Between the time difference that formed be equal to propagation time of the fault traveling wave on first aerial line deduct successively it is described former
Barrier propagation time of the traveling wave on second aerial line and the propagation time on the cable；
When with the junction point between the cable and second aerial line as the default preset failure traveling wave
During point, the preset failure traveling wave starting point reaches the time of first bus and its corresponds to time up to second bus
Between formed time difference be equal to the fault traveling wave on first aerial line and the cable propagation time be added
Sum, then deduct propagation time of the fault traveling wave on second aerial line；
When with the junction point between second aerial line and second bus as the default preset failure traveling wave
During starting point, the preset failure traveling wave starting point reach the time of first bus and its correspond to up to second bus when
Between between formed time difference correspond to respectively in first aerial line, the second aerial line and cable equal to the fault traveling wave
Three's propagation time sum on line.
Wherein, step S4 is specifically included：
When the fault traveling wave for calculating be actually reached between first bus and second bus formed when
Between difference be more than with the junction point between first aerial line and first bus as the default preset failure traveling wave
The time difference formed during starting point, and less than with the junction point between first aerial line and the cable as described default
Preset failure traveling wave starting point when formed time difference when, determine the actually located abort situation of the fault traveling wave be located at institute
State on the first aerial line, and calculate between the abort situation of the determination and first bus and/or second bus
Distance；
When the fault traveling wave for calculating be actually reached between first bus and second bus formed when
Between difference be more than with the junction point between first aerial line and the cable for the default preset failure traveling wave
During the time difference formed during point, and less than with the junction point between the cable and second aerial line as described default
Preset failure traveling wave starting point when formed time difference when, determine the actually located abort situation of the fault traveling wave be located at institute
State on cable, and calculate between the abort situation of the determination and first bus and/or second bus away from
From；
When the fault traveling wave for calculating be actually reached between first bus and second bus formed when
Between difference be more than with the junction point between the cable and second aerial line for the default preset failure traveling wave
During the time difference formed during point, and less than with the junction point between second aerial line and second bus as described pre-
If preset failure traveling wave starting point when formed time difference when, determine that the actually located abort situation of the fault traveling wave is located at
On second aerial line, and calculate the abort situation of the determination and first bus and/or second bus it
Between distance.
The embodiment of the present invention additionally provides a kind of system of cable mixed power transmission line fault localization, and it is in three-stage cable
Realize on joint line, the cable joint line is by the first aerial line, the second aerial line and is arranged at described first and makes somebody a mere figurehead
Cable between line and second aerial line is formed, and first aerial line is also connected with the first bus, and described second
Aerial line is also connected with the second bus, and the system includes：
Propagation time computing unit, for distinguishing corresponding according to first aerial line, the second aerial line and cable
Length and fault traveling wave correspond to respectively the spread speed on first aerial line, the second aerial line and cable, obtain
The fault traveling wave corresponds to respectively the propagation time on first aerial line, the second aerial line and cable；
Time difference scope determining unit, for presetting multiple fault traveling wave starting points, and according to the failed row for obtaining
Ripple corresponds to respectively the propagation time on first aerial line, the second aerial line and cable, calculates each preset failure row
Ripple starting point reaches the time of first bus and its corresponds to up to the time difference formed between the time of second bus；
Wherein, default multiple fault traveling wave starting points include junction point between first aerial line and first bus,
The junction point between junction point, the cable and second aerial line between first aerial line and the cable
And the junction point between second aerial line and second bus；
Fault traveling wave difference value determining unit actual time, for sometime as initial time, to obtain fault traveling wave reality
Border reaches the time of first bus and reaches the time of second bus, and calculates the fault traveling wave and be actually reached
The time difference formed between first bus and second bus；
Abort situation determining unit, for being actually reached first bus and institute according to the fault traveling wave for calculating
The time difference formed between the second bus is stated, in each preset failure traveling wave starting point for calculating first bus is reached
Time and its correspond to up between the time of second bus formed time difference in, determine the fault traveling wave reality
Residing abort situation, and calculate between the abort situation of the determination and first bus and/or second bus
Distance.
Wherein, spread speed of the fault traveling wave on first aerial line with the fault traveling wave described second
Spread speed on aerial line is equal.
Wherein, the time difference scope determining unit is specifically included：
Very first time difference end points computing module, for when with the company between first aerial line and first bus
When contact is the default preset failure traveling wave starting point, the preset failure traveling wave starting point reaches the time of first bus
And its time difference corresponded to up to formation between the time of second bus is corresponded to respectively in institute equal to the fault traveling wave
State three's propagation time sum on the first aerial line, the second aerial line and cable and take negative value；
Second time difference end points computing module, for when with the connection between first aerial line and the cable
Point for the default preset failure traveling wave starting point when, the preset failure traveling wave starting point reach the time of first bus and
It corresponds to built on stilts described first equal to the fault traveling wave up to the time difference formed between the time of second bus
Propagation time on line was deducted successively on propagation time and the cable of the fault traveling wave on second aerial line
Propagation time；
3rd time difference end points computing module, for when with the connection between the cable and second aerial line
Point for the default preset failure traveling wave starting point when, the preset failure traveling wave starting point reach the time of first bus and
It corresponds to built on stilts described first equal to the fault traveling wave up to the time difference formed between the time of second bus
Propagation time sum on line and the cable, then when deducting propagation of the fault traveling wave on second aerial line
Between；
4th time difference end points computing module, for when with the company between second aerial line and second bus
When contact is the default preset failure traveling wave starting point, the preset failure traveling wave starting point reaches the time of first bus
And its time difference corresponded to up to formation between the time of second bus is corresponded to respectively in institute equal to the fault traveling wave
State three's propagation time sum on the first aerial line, the second aerial line and cable.
Wherein, the abort situation determining unit is specifically included：
Fisrt fault position and apart from determining module, the fault traveling wave for described calculating is actually reached described first
The time difference formed between bus and second bus is more than between first aerial line and first bus
The time difference that junction point is formed when being the default preset failure traveling wave starting point, and less than with first aerial line and institute
When stating the time difference formed when the junction point between cable is the default preset failure traveling wave starting point, the event is determined
The actually located abort situation of barrier traveling wave is located on first aerial line, and calculate the abort situation of the determination with it is described
The distance between first bus and/or second bus；
Second abort situation and apart from determining module, the fault traveling wave for described calculating is actually reached described first
The time difference formed between bus and second bus is more than with the company between first aerial line and the cable
During the time difference that contact is formed when being the default preset failure traveling wave starting point, and less than with the cable and described
During the time difference that the junction point between two aerial lines is formed when being the default preset failure traveling wave starting point, the event is determined
The actually located abort situation of barrier traveling wave is located on the cable, and calculates the abort situation and described first of the determination
The distance between bus and/or second bus；
3rd abort situation and apart from determining module, the fault traveling wave for described calculating is actually reached described first
The time difference formed between bus and second bus is more than with the company between the cable and second aerial line
During the time difference that contact is formed when being the default preset failure traveling wave starting point, and less than with second aerial line and institute
When stating the time difference formed when the junction point between the second bus is the default preset failure traveling wave starting point, it is determined that described
The actually located abort situation of fault traveling wave is located on second aerial line, and calculates abort situation and the institute of the determination
State the distance between the first bus and/or second bus.
Implement the embodiment of the present invention, have the advantages that：
In embodiments of the present invention, due to fault traveling wave three-stage cable joint line (including the first aerial line,
Two aerial lines and cable) each section of upper spread speed determining propagation time of the fault traveling wave on each section of circuit, and with each section
It is analyst coverage that junction point between circuit reaches the first bus and the time difference of the second bus formation, filters out fault traveling wave reality
The scope residing for time difference that border is formed, and the actually located position of failure and distance are determined with this, so as to only need collection
Fault traveling wave reaches for the first time the first bus and the time of the second bus is capable of achieving, therefore reduces measurement data, simplifies
Calculate, complicated multistage cable aerial line mixed power transmission line can be applied to, improve the standard of mixed power transmission line fault localization
True property and reliability, with good future in engineering applications.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, according to
These accompanying drawings obtain other accompanying drawings and still fall within scope of the invention.
Fig. 1 is a kind of flow chart of the method for cable mixed power transmission line fault localization provided in an embodiment of the present invention；
Fig. 2 be a kind of cable mixed power transmission line fault localization provided in an embodiment of the present invention method in three-stage cable
Joint line structural representation；
Fig. 3 is in a kind of method application scenarios of cable mixed power transmission line fault localization provided in an embodiment of the present invention
One three-stage cable joint line structural representation；
Fig. 4 is in a kind of method application scenarios of cable mixed power transmission line fault localization provided in an embodiment of the present invention
Another three-stage cable joint line structural representation；
Fig. 5 is in a kind of method application scenarios of cable mixed power transmission line fault localization provided in an embodiment of the present invention
Another three-stage cable joint line structural representation；
Fig. 6 is a kind of structural representation of the system of cable mixed power transmission line fault localization provided in an embodiment of the present invention
Figure.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with accompanying drawing
Step ground is described in detail.
As shown in figure 1, in the embodiment of the present invention, there is provided a kind of cable mixed power transmission line fault localization method,
It realizes that the cable joint line is by the first aerial line, the second aerial line in three-stage cable joint line (as shown in Figure 2)
And the cable being arranged between the first aerial line and the second aerial line is formed, and the first aerial line also with the first bus (not
Diagram) it is connected, the second aerial line is also connected (not shown) with the second bus, and methods described includes：
Step S1, corresponding length and failed row are distinguished according to first aerial line, the second aerial line and cable
Ripple corresponds to respectively the spread speed on first aerial line, the second aerial line and cable, obtains the failed row wavelength-division
Do not correspond to the propagation time on first aerial line, the second aerial line and cable；
Detailed process is, it is that L2 and second is maked somebody a mere figurehead that the length for obtaining the first aerial line AM is L1, the length of cable MN
The length of line NB is L3, determines that spread speed of the fault traveling wave in cable is v by fault traveling wave acquisition instrumentC, and
Spread speed in the first aerial line and the second aerial line is equal and for vO；
Respectively according to formula (1), (2) and (3), respectively obtain fault traveling wave and correspond to respectively in the propagation of the first aerial line
Between t1, propagation time t on the second aerial line2With the propagation time t on cable3：
S2, default multiple fault traveling wave starting points, and corresponded to respectively in the first according to the fault traveling wave for obtaining
In propagation time on ceases to be busy, the second aerial line and cable, calculate each preset failure traveling wave starting point and reach first bus
Time and its correspond to up between the time of second bus formed time difference；Wherein, default multiple events
Barrier traveling wave starting point includes the junction point between first aerial line and first bus, first aerial line and the electricity
The junction point between junction point, the cable and second aerial line and second aerial line and institute between cable
State the junction point between the second bus；
Detailed process is, when line failure, for transmission line of electricity known to line parameter circuit value, due to fault traveling wave by
Any point travels to the first bus and the time difference of the second bus is constant, therefore default multiple fault traveling wave starting points, respectively
Distributed areas of the time difference Δ t that default fault traveling wave starting point is formed on joint line AB is Δ t1～Δ t4, specifically such as
Under：
(1) when with the junction point (terminal A) between the first aerial line AM and the first bus as default preset failure traveling wave
During starting point, preset failure traveling wave starting point reaches the time of the first bus and its corresponds to up to formation between the time of the second bus
When time difference corresponds to respectively three's propagation on the first aerial line AM, the second aerial line NB and cable MN equal to fault traveling wave
Between sum take negative value, i.e. Δ t1=-(t1+t2+t3)；
(2) when with the junction point (end points M) between the first aerial line AM and cable MN as default preset failure traveling wave
During starting point, preset failure traveling wave starting point reaches the time of the first bus and its corresponds to up to formation between the time of the second bus
Time difference deducts successively fault traveling wave in the second aerial line NB equal to propagation time of the fault traveling wave on the first aerial line AM
On propagation time and the propagation time on cable MN, i.e. Δ t2=t1-(t2+t3)；
(3) when with the junction point (end points N) between cable MN and the second aerial line NB as default preset failure traveling wave
During starting point, preset failure traveling wave starting point reaches the time of the first bus and its corresponds to up to formation between the time of the second bus
Time difference is equal to fault traveling wave propagation time sum on the first aerial line AM and cable MN, then deducts fault traveling wave
Propagation time on the second aerial line NB, i.e. Δ t3=t1+t2-t3；
(4) when with the junction point (terminal B) between the second aerial line NB and the second bus as default preset failure traveling wave
During starting point, preset failure traveling wave starting point reaches the time of the first bus and its corresponds to up to formation between the time of the second bus
When time difference corresponds to respectively three's propagation on the first aerial line AM, the second aerial line NB and cable MN equal to fault traveling wave
Between sum, i.e. Δ t4=t1+t2+t3。
S3, with sometime as initial time, obtain time and arrival that fault traveling wave is actually reached first bus
The time of second bus, and calculate the fault traveling wave and be actually reached between first bus and second bus
The time difference of formation；
Detailed process is, it is assumed that t=0 is initial time, obtains the fault traveling wave that trouble point occurs and reaches the first bus
Time is (such as tA) and reach the second bus time (tB), calculate fault traveling wave be actually reached the first bus and the second bus it
Between formed time difference Δ t=tA-tB；
S4, according to the fault traveling wave for calculating be actually reached between first bus and second bus formed
Time difference, reach the time of first bus and its correspond in each preset failure traveling wave starting point for calculating and reach
In the time difference formed between the time of second bus, the actually located abort situation of the fault traveling wave is determined, and
Calculate the abort situation and the distance between first bus and/or second bus of the determination.
Detailed process is, on the either segment circuit that the position that trouble point occurs can be on three-stage joint line, specifically
Localization of faults location is as follows：
(I) when the fault traveling wave for calculating is actually reached the time difference Δ t formed between the first bus and the second bus
Formed during more than with the junction point (terminal A) between the first aerial line AM and the first bus as default preset failure traveling wave starting point
Time difference Δ t1, and less than with the junction point (end points M) between the first aerial line AM and cable MN as default default
The time difference Δ t formed during fault traveling wave starting point2When, i.e. Δ t1<Δt<Δt2, determine the actually located failure of fault traveling wave
Position is located on the first aerial line AM, and calculates abort situation and the distance between the first bus and/or the second bus；
For example according to formula (4), abort situation is obtained with the first bus apart from LAF：
Thus according to formula (5), abort situation is obtained with the second bus apart from LBF：
LBF=L1+L2+L3-LAF (5)。
(II) when the fault traveling wave for calculating is actually reached the time difference Δ t formed between the first bus and the second bus
Formed during more than with the junction point (end points M) between the first aerial line AM and cable MN as default preset failure traveling wave starting point
Time difference Δ t2When, and less than with the junction point (end points N) between cable MN and the second aerial line NB as default pre-
If the time difference Δ t formed during fault traveling wave starting point3When, i.e. Δ t2<Δt<Δt3, determine the actually located event of fault traveling wave
Barrier position is located on cable MN, and calculates abort situation and the distance between the first bus and/or the second bus；
For example according to formula (6), abort situation is obtained with the first bus apart from LAF：
In the same manner, according to formula (5), abort situation is obtained with the second bus apart from LBF。
(III) when the fault traveling wave for calculating is actually reached the time difference Δ formed between the first bus and the second bus
T is more than shape during with the junction point (end points N) between cable MN and the second aerial line NB as default preset failure traveling wave starting point
Into time difference Δ t3When, and less than with the junction point (terminal B) between the second aerial line NB and the second bus as default
The time difference Δ t formed during preset failure traveling wave starting point4When, i.e. Δ t3<Δt<Δt4, determine that fault traveling wave is actually located
Abort situation is located on the second aerial line NB, and calculates abort situation and the distance between the first bus and/or the second bus.
For example according to formula (7), abort situation is obtained with the first bus apart from LAF：
In the same manner, according to formula (5), abort situation is obtained with the first bus apart from LBF。
As shown in Fig. 3 to 5, to the embodiment of the present invention in a kind of cable mixed power transmission line fault localization method should
It is described further with scene：
In Fig. 3 to Fig. 5, A represents respectively the first bus end and second that three-stage cable joint line two ends are connected with B
Bus end, F represents position of failure point, and M represents the junction point of cable and the first aerial line, and N represents cable and the second aerial line
Junction point, L1、L2、L3The total length of the first aerial line AM sections, cable MN sections and the second aerial line NB sections, D are represented respectivelyAF、DBF
The distance of the buses of trouble point F to first S and the second bus R, t are represented respectivelyA1And tB1Represent that fault traveling wave reaches circuit A respectively
End and the absolute moment of B ends bus.
Assume aerial line AM segment length L1=30km, cable MN segment length L2=40km, aerial line NB segment length L3=
28km, fault traveling wave spread speed v in the cablec=192km/ms, spread speed v of the fault traveling wave in aerial lineO=
295km/ms, then
Further calculate, Δ t1=-(t1+t2+t3The μ s of)=- 404.9, Δ t2=t1-(t2+t3The μ s of)=- 201.5, Δ t3
=t1+t2-t3=215.1 μ s, Δ t4=t1+t2+t3=404.9 μ s；
And when setting t=0, there is singlephase earth fault in F points：
When measuring tA1=42.6 μ s, tB1=365 μ s, try to achieve Δ t=tA1-tB1=-322.4 μ s, because Δ t1<Δt<Δ
t2, so trouble point F is located at aerial line AM sections, brings Δ t into formula (4) and obtain LAF=12.168km, and actual fault point F distances
A ends apart from 12km, range error is 168m；
When measuring tA1=261 μ s, tB1=148 μ s, try to achieve Δ t=tA1-tB1=113 μ s, because Δ t2<Δt<Δt3, institute
Cable MN sections are located at trouble point F, Δ t are brought into formula (6) and is obtained LAF=60.197km, and actual fault point F apart from A ends away from
From 60km, range error is 197m；
When measuring tA1=346 μ s, tB1=62 μ s, try to achieve Δ t=tA1-tB1=284 μ s, because Δ t3<Δt<Δt4, institute
Aerial line NB sections are located at trouble point F, Δ t are brought into formula (7) and is obtained LAF=80.179km, and actual fault point F is apart from A ends
Apart from 80km, range error is 179m.
As shown in fig. 6, in the embodiment of the present invention, there is provided a kind of cable mixed power transmission line fault localization system,
It realizes that the cable joint line is by the first aerial line, the second aerial line and setting on three-stage cable joint line
Cable between first aerial line and second aerial line is formed, and first aerial line also with the first bus
It is connected, second aerial line is also connected with the second bus, and the system includes：
Propagation time computing unit 110, for being corresponded to respectively according to first aerial line, the second aerial line and cable
Length and fault traveling wave correspond to the spread speed on first aerial line, the second aerial line and cable respectively, obtain
The propagation time on first aerial line, the second aerial line and cable is corresponded to respectively to the fault traveling wave；
Time difference scope determining unit 120, for presetting multiple fault traveling wave starting points, and according to the failure for obtaining
Traveling wave corresponds to respectively the propagation time on first aerial line, the second aerial line and cable, calculates each preset failure
Traveling wave starting point reaches the time of first bus and its corresponds to up to the time difference formed between the time of second bus
Value；Wherein, default multiple fault traveling wave starting points include the connection between first aerial line and first bus
The company between junction point, the cable and second aerial line between point, first aerial line and the cable
Junction point between contact and second aerial line and second bus；
Fault traveling wave difference value determining unit actual time 130, for sometime as initial time, to obtain fault traveling wave
It is actually reached the time of first bus and reaches the time of second bus, and calculates that the fault traveling wave is actual to be arrived
Up to the time difference formed between first bus and second bus；
Abort situation determining unit 140, for being actually reached first bus according to the fault traveling wave for calculating
And the time difference formed between second bus, reach described first in each preset failure traveling wave starting point for calculating
The time of bus and its correspond to up between the time of second bus formed time difference in, determine the fault traveling wave
Actually located abort situation, and calculate the abort situation and first bus and/or second bus of the determination
The distance between.
Wherein, spread speed of the fault traveling wave on first aerial line with the fault traveling wave described second
Spread speed on aerial line is equal.
Wherein, the time difference scope determining unit 120 is specifically included：
Very first time difference end points computing module 1201, for when between first aerial line and first bus
Junction point when being the default preset failure traveling wave starting point, the preset failure traveling wave starting point reaches first bus
Time and its time difference corresponded to up to formation between the time of second bus are corresponded to respectively equal to the fault traveling wave
Three's propagation time sum takes negative value on first aerial line, the second aerial line and cable；
Second time difference end points computing module 1202, for when between first aerial line and the cable
When junction point is the default preset failure traveling wave starting point, the preset failure traveling wave starting point reach first bus when
Between and its correspond to up between the time of second bus formed time difference be equal to the fault traveling wave described first
Propagation time on aerial line deducts successively propagation time and the cable of the fault traveling wave on second aerial line
Propagation time on line；
3rd time difference end points computing module 1203, for when between the cable and second aerial line
When junction point is the default preset failure traveling wave starting point, the preset failure traveling wave starting point reach first bus when
Between and its correspond to up between the time of second bus formed time difference be equal to the fault traveling wave described first
Propagation time sum on aerial line and the cable, then deduct biography of the fault traveling wave on second aerial line
Between sowing time；
4th time difference end points computing module 1204, for when between second aerial line and second bus
Junction point when being the default preset failure traveling wave starting point, the preset failure traveling wave starting point reaches first bus
Time and its time difference corresponded to up to formation between the time of second bus are corresponded to respectively equal to the fault traveling wave
Three's propagation time sum on first aerial line, the second aerial line and cable.
Wherein, the abort situation determining unit 140 is specifically included：
Fisrt fault position and apart from determining module 1401, the fault traveling wave for described calculating is actually reached described
Between first bus and second bus formed time difference be more than with first aerial line and first bus it
Between the time difference that formed when being the default preset failure traveling wave starting point of junction point, and less than with first aerial line
During the time difference formed when with the junction point between the cable being the default preset failure traveling wave starting point, institute is determined
The actually located abort situation of fault traveling wave is stated on first aerial line, and calculate the abort situation of the determination with
The distance between first bus and/or second bus；
Second abort situation and apart from determining module 1402, the fault traveling wave for described calculating is actually reached described
The time difference formed between first bus and second bus is more than between first aerial line and the cable
Junction point formed when being the default preset failure traveling wave starting point time difference when, and less than with the cable and institute
When stating the time difference formed when the junction point between the second aerial line is the default preset failure traveling wave starting point, institute is determined
The actually located abort situation of fault traveling wave is stated on the cable, and calculate the abort situation of the determination with it is described
The distance between first bus and/or second bus；
3rd abort situation and apart from determining module 1403, the fault traveling wave for described calculating is actually reached described
The time difference formed between first bus and second bus is more than between the cable and second aerial line
Junction point formed when being the default preset failure traveling wave starting point time difference when, and less than with second aerial line
During the time difference formed when with the junction point between second bus being the default preset failure traveling wave starting point, it is determined that
The actually located abort situation of the fault traveling wave is located on second aerial line, and calculates the abort situation of the determination
With the distance between first bus and/or second bus.
Implement the embodiment of the present invention, have the advantages that：
In embodiments of the present invention, due to fault traveling wave three-stage cable joint line (including the first aerial line,
Two aerial lines and cable) each section of upper spread speed determining propagation time of the fault traveling wave on each section of circuit, and with each section
It is analyst coverage that junction point between circuit reaches the first bus and the time difference of the second bus formation, filters out fault traveling wave reality
The scope residing for time difference that border is formed, and the actually located position of failure and distance are determined with this, so as to only need collection
Fault traveling wave reaches for the first time the first bus and the time of the second bus is capable of achieving, therefore reduces measurement data, simplifies
Calculate, complicated multistage cable aerial line mixed power transmission line can be applied to, improve the standard of mixed power transmission line fault localization
True property and reliability, with good future in engineering applications.
It should be noted that in said system embodiment, each included system unit simply enters according to function logic
What row was divided, but above-mentioned division is not limited to, as long as corresponding function can be realized；In addition, each functional unit
Specific name is also only to facilitate mutually differentiation, is not limited to protection scope of the present invention.
One of ordinary skill in the art will appreciate that realizing that all or part of step in above-described embodiment method can be
Related hardware is instructed to complete by program, described program can be stored in a computer read/write memory medium,
Described storage medium, such as ROM/RAM, disk, CD.
Above disclosed is only present pre-ferred embodiments, can not limit the right model of the present invention with this certainly
Enclose, therefore the equivalent variations made according to the claims in the present invention, still belong to the scope that the present invention is covered.
Claims (8)
1. a kind of method of cable mixed power transmission line fault localization, it is realized on three-stage cable joint line, the line
Cable joint line is by the first aerial line, the second aerial line and is arranged between first aerial line and second aerial line
Cable formed, and first aerial line is also connected with the first bus, and second aerial line is also connected with the second bus,
Characterized in that, methods described includes：
S1, corresponding length is distinguished according to first aerial line, the second aerial line and cable and fault traveling wave is right respectively
Should obtain the fault traveling wave and correspond to respectively in the spread speed on first aerial line, the second aerial line and cable
Propagation time on first aerial line, the second aerial line and cable；
S2, preset multiple fault traveling wave starting points, and according to the fault traveling wave for obtaining correspond to respectively first aerial line,
In propagation time on second aerial line and cable, calculate the time that each preset failure traveling wave starting point reaches first bus
And its correspond to up to the time difference formed between the time of second bus；Wherein, default multiple fault traveling waves
Starting point include junction point between first aerial line and first bus, first aerial line and the cable it
Between junction point, the junction point between the cable and second aerial line and second aerial line and described second
Junction point between bus；
S3, with sometime as initial time, obtain fault traveling wave and be actually reached the time of first bus and reach described
The time of the second bus, and calculate the fault traveling wave be actually reached between first bus and second bus formed
Time difference；
S4, according to the fault traveling wave for calculating be actually reached between first bus and second bus formed when
Between difference, reach the time of first bus in each preset failure traveling wave starting point for calculating and its correspond to up to described
In the time difference formed between the time of the second bus, the actually located abort situation of the fault traveling wave is determined, and calculate
Go out the abort situation and the distance between first bus and/or second bus of the determination.
2. the method for claim 1, it is characterised in that in step S1, " fault traveling wave is described first
Spread speed on aerial line " is equal with " spread speed of the fault traveling wave on second aerial line ".
3. method as claimed in claim 2, it is characterised in that step S2 is specifically included：
When with the junction point between first aerial line and first bus as the default preset failure traveling wave starting point
When, the preset failure traveling wave starting point reach the time of first bus and its correspond to up to second bus time it
Between formed time difference correspond to respectively on first aerial line, the second aerial line and cable equal to the fault traveling wave
Three's propagation time sum takes negative value；
When with the junction point between first aerial line and the cable as the default preset failure traveling wave starting point,
The preset failure traveling wave starting point reaches the time of first bus and its corresponds to up between the time of second bus
The time difference of formation deducts successively the failed row equal to propagation time of the fault traveling wave on first aerial line
Propagation time of the ripple on second aerial line and the propagation time on the cable；
When with the junction point between the cable and second aerial line as the default preset failure traveling wave starting point,
The preset failure traveling wave starting point reaches the time of first bus and its corresponds to up between the time of second bus
The time difference of formation is equal to fault traveling wave propagation time sum on first aerial line and the cable,
Propagation time of the fault traveling wave on second aerial line is deducted again；
When with the junction point between second aerial line and second bus as the default preset failure traveling wave starting point
When, the preset failure traveling wave starting point reach the time of first bus and its correspond to up to second bus time it
Between formed time difference correspond to respectively on first aerial line, the second aerial line and cable equal to the fault traveling wave
Three's propagation time sum.
4. method as claimed in claim 3, it is characterised in that step S4 is specifically included：
When the fault traveling wave for calculating is actually reached the time difference formed between first bus and second bus
Value is more than with the junction point between first aerial line and first bus as the default preset failure traveling wave starting point
When the time difference that formed, and less than with the junction point between first aerial line and the cable as described default pre-
If during the time difference formed during fault traveling wave starting point, determining that the actually located abort situation of the fault traveling wave is located at described the
On one aerial line, and calculate between the abort situation of the determination and first bus and/or second bus away from
From；
When the fault traveling wave for calculating is actually reached the time difference formed between first bus and second bus
When value is more than with the junction point between first aerial line and the cable as the default preset failure traveling wave starting point
During the time difference of formation, and less than with the junction point between the cable and second aerial line as described default pre-
If during the time difference formed during fault traveling wave starting point, determining that the actually located abort situation of the fault traveling wave is located at the electricity
On cable, and calculate the abort situation and the distance between first bus and/or second bus of the determination；
When the fault traveling wave for calculating is actually reached the time difference formed between first bus and second bus
When value is more than with the junction point between the cable and second aerial line as the default preset failure traveling wave starting point
During the time difference of formation, and less than with the junction point between second aerial line and second bus as described default
During the time difference formed during preset failure traveling wave starting point, determine that the actually located abort situation of the fault traveling wave is located at described
On second aerial line, and calculate between the abort situation of the determination and first bus and/or second bus
Distance.
5. a kind of system of cable mixed power transmission line fault localization, it is realized on three-stage cable joint line, the line
Cable joint line is by the first aerial line, the second aerial line and is arranged between first aerial line and second aerial line
Cable formed, and first aerial line is also connected with the first bus, and second aerial line is also connected with the second bus,
Characterized in that, the system includes：
Propagation time computing unit, for distinguishing corresponding length according to first aerial line, the second aerial line and cable
And fault traveling wave corresponds to respectively the spread speed on first aerial line, the second aerial line and cable, obtain described
Fault traveling wave corresponds to respectively the propagation time on first aerial line, the second aerial line and cable；
Time difference scope determining unit, for presetting multiple fault traveling wave starting points, and according to the failed row wavelength-division for obtaining
The propagation time on first aerial line, the second aerial line and cable is not corresponded to, each preset failure traveling wave is calculated and is risen
Point reaches the time of first bus and its corresponds to up to the time difference formed between the time of second bus；Its
In, default multiple fault traveling wave starting points include junction point, the institute between first aerial line and first bus
State the junction point between the first aerial line and the cable, the junction point between the cable and second aerial line with
And the junction point between second aerial line and second bus；
Fault traveling wave difference value determining unit actual time, for fault traveling wave is actual to be arrived sometime as initial time, to obtain
Up to first bus time and reach the time of second bus, and calculate the fault traveling wave be actually reached it is described
The time difference formed between first bus and second bus；
Abort situation determining unit, for being actually reached first bus and described according to the fault traveling wave for calculating
The time difference formed between two buses, when each preset failure traveling wave starting point for calculating reaches first bus
Between and its correspond to up between the time of second bus formed time difference in, determine that the fault traveling wave is actually located
Abort situation, and calculate between the abort situation of the determination and first bus and/or second bus away from
From.
6. system as claimed in claim 5, it is characterised in that propagation speed of the fault traveling wave on first aerial line
Spread speed of the degree with the fault traveling wave on second aerial line is equal.
7. system as claimed in claim 6, it is characterised in that the time difference scope determining unit is specifically included：
Very first time difference end points computing module, for when with the junction point between first aerial line and first bus
For the default preset failure traveling wave starting point when, the preset failure traveling wave starting point reach the time of first bus and its
Correspond to up to the time difference formed between the time of second bus and corresponded to respectively described the equal to the fault traveling wave
Three's propagation time sum takes negative value on one aerial line, the second aerial line and cable；
Second time difference end points computing module, be with the junction point between first aerial line and the cable for working as
During the default preset failure traveling wave starting point, the preset failure traveling wave starting point reaches time of first bus and its right
Should reach between the time of second bus formed time difference be equal to the fault traveling wave on first aerial line
Propagation time deduct propagation time of the fault traveling wave on second aerial line and the biography on the cable successively
Between sowing time；
3rd time difference end points computing module, be with the junction point between the cable and second aerial line for working as
During the default preset failure traveling wave starting point, the preset failure traveling wave starting point reaches time of first bus and its right
Should reach the time difference formed between the time of second bus be equal to the fault traveling wave in first aerial line and
Propagation time sum on the cable, then deduct propagation time of the fault traveling wave on second aerial line；
4th time difference end points computing module, for when with the junction point between second aerial line and second bus
For the default preset failure traveling wave starting point when, the preset failure traveling wave starting point reach the time of first bus and its
Correspond to up to the time difference formed between the time of second bus and corresponded to respectively described the equal to the fault traveling wave
Three's propagation time sum on one aerial line, the second aerial line and cable.
8. system as claimed in claim 7, it is characterised in that the abort situation determining unit is specifically included：
Fisrt fault position and apart from determining module, the fault traveling wave for described calculating is actually reached first bus
And the time difference formed between second bus is more than with the connection between first aerial line and first bus
The time difference that point is formed when being the default preset failure traveling wave starting point, and less than with first aerial line and the electricity
During the time difference that the junction point between cable is formed when being the default preset failure traveling wave starting point, the failed row is determined
The actually located abort situation of ripple is located on first aerial line, and calculates the abort situation and described first of the determination
The distance between bus and/or second bus；
Second abort situation and apart from determining module, the fault traveling wave for described calculating is actually reached first bus
And the time difference formed between second bus is more than with the junction point between first aerial line and the cable
For the default preset failure traveling wave starting point when formed time difference when, and less than with the cable and second frame
During the time difference that the junction point between ceases to be busy is formed when being the default preset failure traveling wave starting point, the failed row is determined
The actually located abort situation of ripple is located on the cable, and calculates the abort situation and first bus of the determination
The distance between and/or second bus；
3rd abort situation and apart from determining module, the fault traveling wave for described calculating is actually reached first bus
And the time difference formed between second bus is more than with the junction point between the cable and second aerial line
For the default preset failure traveling wave starting point when formed time difference when, and less than with second aerial line and described
During the time difference that the junction point between two buses is formed when being the default preset failure traveling wave starting point, the failure is determined
The actually located abort situation of traveling wave is located on second aerial line, and calculates the abort situation of the determination with described the
The distance between one bus and/or second bus.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10177054A (en) * | 1996-12-17 | 1998-06-30 | Chubu Electric Power Co Inc | Faulty position detecting system for overhead transmission line |
| CN102096022A (en) * | 2010-12-09 | 2011-06-15 | 山东电力集团公司潍坊供电公司 | Traveling wave failure distance measurement method for electric power circuit |
| CN102353875A (en) * | 2011-09-30 | 2012-02-15 | 山东理工大学 | Fault distance measuring method for combined travelling wave of power transmission line |
| CN102508109A (en) * | 2011-09-30 | 2012-06-20 | 山东理工大学 | Combined traveling wave fault location method of high-voltage overhead line and cable hybrid line |
| CN103901324A (en) * | 2014-04-14 | 2014-07-02 | 国家电网公司 | Method for hybrid circuit combined distance measurement of power distribution network based on single-ended fault information |
| CN104535896A (en) * | 2015-01-15 | 2015-04-22 | 山东理工大学 | Method for ranging high voltage mixed electric transmission line combination traveling wave |
| CN105301440A (en) * | 2015-10-12 | 2016-02-03 | 深圳供电局有限公司 | Method and system for cable hybrid power transmission line double-end traveling wave distance measurement |
| CN105866621A (en) * | 2016-03-30 | 2016-08-17 | 昆明理工大学 | Fault ranging method based on mode time difference |
-
2016
- 2016-10-19 CN CN201610912452.6A patent/CN106569090A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10177054A (en) * | 1996-12-17 | 1998-06-30 | Chubu Electric Power Co Inc | Faulty position detecting system for overhead transmission line |
| CN102096022A (en) * | 2010-12-09 | 2011-06-15 | 山东电力集团公司潍坊供电公司 | Traveling wave failure distance measurement method for electric power circuit |
| CN102353875A (en) * | 2011-09-30 | 2012-02-15 | 山东理工大学 | Fault distance measuring method for combined travelling wave of power transmission line |
| CN102508109A (en) * | 2011-09-30 | 2012-06-20 | 山东理工大学 | Combined traveling wave fault location method of high-voltage overhead line and cable hybrid line |
| CN103901324A (en) * | 2014-04-14 | 2014-07-02 | 国家电网公司 | Method for hybrid circuit combined distance measurement of power distribution network based on single-ended fault information |
| CN104535896A (en) * | 2015-01-15 | 2015-04-22 | 山东理工大学 | Method for ranging high voltage mixed electric transmission line combination traveling wave |
| CN105301440A (en) * | 2015-10-12 | 2016-02-03 | 深圳供电局有限公司 | Method and system for cable hybrid power transmission line double-end traveling wave distance measurement |
| CN105866621A (en) * | 2016-03-30 | 2016-08-17 | 昆明理工大学 | Fault ranging method based on mode time difference |
Non-Patent Citations (2)
| Title |
|---|
| 梁凤强 等: "架空线_海底电缆混合线路组合行波测距方法", 《电力***及其自动化》 * |
| 黄震 等: "基于双端行波原理的高压架空线_电缆混合线路故障定位方法", 《电力***自动化》 * |
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