CN110376480A - One kind being based on 110kV same tower double back transmission line lightning fault localization method - Google Patents
One kind being based on 110kV same tower double back transmission line lightning fault localization method 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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Abstract
The present invention relates to one kind to be based on 110kV same tower double back transmission line lightning fault localization method, belongs to Relay Protection Technology in Power System field.The present invention uses, and model of power transmission system is unfolded along the side N, M and M ' is same measurement end, N is opposite end bus, it is the midpoint of route MM ' after multiple-circuit on same tower is unfolded, so MN is I loop line road, NM ' is II loop line road, by taking lightning fault and flashover occur in I loop line road as an example, i.e. in route MN, so that the propagation path for propagating catadioptric to traveling wave is analyzed.From simulating, verifying as can be seen that no matter flashover point on the left of lightning strike spot or right side, show that this method is correctly effective.Now to the Research on Identification spininess of lightning stroke property to single back line, therefore the present invention is based on the analyses to thunder and lightning traveling wave, are 110kV multiple-circuit on same tower for object.
Description
Technical field
The present invention relates to one kind to be based on 110kV same tower double back transmission line lightning fault localization method, belongs to electric system
Technical field of relay protection.
Background technique
Compared with voltage class is the transmission line of electricity of 220kV or more, 110kV transmission line insulator intensity is lower, route
Corridor is mostly by populated area, and corridor environment is complicated, and especially 110kV multiple-circuit on same tower is compared with increasingly complex.Same tower
Double back transmission line often lift lever tower height degree, lightning conducter shielding action is compared with single back line to be substantially reduced, and incident is increased
The probability being struck by lightning.Show under same voltage class that multiple-circuit on same tower is more subject to than single back line according to previous operating experience
Lightning stroke, and reclosing success probability in the case that two loop line roads are tripped simultaneously occurs and is lower than single back line, substantially it is struck by lightning
Severely afflicated area brings tremendous influence to the safe and reliable operation of power grid.
When transmission line of electricity is by lightning impulse, the insulator chain of transmission line of electricity weak location occurs for biggish lightning current
Flashover, inject route lightning current will along the side road direction bus M, the side N propagate, thunder and lightning flow to the side M, in the communication process of the side N by
The insulator chain that the influences such as extraneous bird pest, fog reduce insulation compressive resistance, then may make the insulator chain that flashover occur,
At this time lightning strike spot between flashover point at a distance from be greater than span between shaft tower, form lightning strike spot and flashover point be inconsistent shows
As.
Correct decision lightning stroke property has positive meaning to transmission line of electricity reliability service.Now to the identification of lightning stroke property
To spininess to single back line, the research recognized for multiple-circuit on same tower lightning stroke property is relatively fewer for research.Therefore how effectively
The lightning strike spot and flashover point for positioning multiple-circuit on same tower, there is the meaning of directiveness to the development of multiple-circuit on same tower from now on.
Summary of the invention
The technical problem to be solved in the present invention is to provide one kind to be based on 110kV same tower double back transmission line lightning strike spot and flashover
The inconsistent localization method of point has positive meaning to transmission line of electricity reliability service to be properly positioned lightning strike spot and flashover point
Justice.
The technical scheme is that a kind of be based on 110kV same tower double back transmission line lightning fault localization method, tool
Body step are as follows:
Step1: when the part 110kV, multiple-circuit on same tower is struck by lightning, by model of power transmission system along the side N be unfolded, M with
M ' is same measurement end, and it is the midpoint of route MM ' after multiple-circuit on same tower is unfolded that N, which is opposite end bus, so MN returns for I
Route, NM ' is II loop line road, i.e., in route MN, so that the propagation path for propagating catadioptric to traveling wave is analyzed.Pass through
Single-ended detection to Mintrop wave head step-out time lightning strike spot can be positioned, the distance point that position of being struck by lightning is held away from the end M and M '
X is not denoted as itmWith xm’；
Step2: in the subsequent wave head that the end M (M ') monitors and first in the case where lightning strike spot and flashover point are inconsistent
Wave head polarity consistently first wave head wm、wnRepresentative meaning can be divided into following three kinds.First is that initial traveling wave of being struck by lightning passes through
The back wave of flashover point, second is that back wave of the initial traveling wave at thunder and lightning circulation road that be struck by lightning when thunder and lightning circulation road does not disappear also,
Third is that back wave when be struck by lightning initial traveling wave and the initial traveling wave of failure are through flashover point.It is monitored by measurement end M (M ') subsequent
First wave head w identical with Mintrop wave head polarity in wave headm、wnStep-out time carries out single end distance measurement, to lightning strike spot and dodge
Network point is positioned；
Step3: straight line calibration is carried out to wave head using Hough transform；
Step4: the overall length after setting route expansion is l, and when lightning fault occurs, initial traveling wave of being struck by lightning and fault traveling wave are passed
It is t at the time of casting to measurement end M (M ')0And t1, in conjunction with traveling wave propagation characteristic, both-end travelling wave ranging can be carried out according to the following formula:
xm'=l-xm
In formula, Δ t=t1-t0, xmDistance for lightning strike spot away from measurement end M, v are experience velocity of wave, xmIt is lightning strike spot away from survey
Measure the distance of end M, xm'It is the distance of lightning strike spot range measurement end M '；
Step5: consider that flashover point in the left and right side of lightning strike spot, draws traveling wave catadioptric network respectively；
Step6: flashover point can be obtained by being located at the traveling wave catadioptric network on the left of lightning strike spot according to flashover point are as follows:
In formula, xsFor flashover point.
The beneficial effects of the present invention are:
1, when transmission line of electricity leads to failure by lightning stroke, and lightning strike spot is with flashover point position difference, both-end distance measuring will be determined
Position is to lightning strike spot rather than flashover point, travelling wave ranging precision will receive adverse effect.The method that the present invention uses can be to lightning strike spot
It is positioned with flashover point, simplifies deterministic process, and judging result is true and reliable.
2, location efficiency is improved it is found that this method shortens lightning fault positioning time with field experience binding analysis
And it calculates easier.
3, the method for the Single Terminal Traveling Wave Fault Location that the present invention uses positions lightning strike spot and flashover point respectively, with both-end
Distance measuring method is compared, so that cost needed for engineering substantially reduces.
Detailed description of the invention
Fig. 1 is circuit model figure of the invention；
Fig. 2 is the traveling wave catadioptric network that flashover point of the present invention is located on the left of lightning strike spot；
Fig. 3 is the traveling wave catadioptric network that flashover point of the present invention is located on the left of lightning strike spot；
Fig. 4 is that the I that flashover point of the present invention is located on the left of lightning strike spot is returned and II loop line road A phase current waveform figure；
Fig. 5 is the I loop line road A phase current waveform figure that flashover point of the present invention is located on the left of lightning strike spot；
Fig. 6 is the II loop line road A phase current waveform figure that flashover point of the present invention is located on the left of lightning strike spot；
Fig. 7 is t of the present invention0Moment wave head calibration maps；
Fig. 8 is t of the present invention1Moment wave head calibration maps；
Fig. 9 is that Hough transform of the present invention seeks flashover point diagram.
Specific embodiment
With reference to the accompanying drawings and detailed description, the invention will be further described.
One kind being based on 110kV same tower double back transmission line lightning fault localization method, as shown in figs 1-9, specifically:
One, the wave head of traveling wave is extracted, and acquires the traveling-wave waveform in short time-window
(1) when the part 110kV, multiple-circuit on same tower is struck by lightning, therefore model of power transmission system is unfolded along the side N, M and M '
For same measurement end, it is the midpoint of route MM ' after multiple-circuit on same tower is unfolded that N, which is opposite end bus, so MN is I loop line
Road, NM ' are II loop line road, by taking lightning fault and flashover occur in I loop line road as an example, i.e., in route MN, thus to traveling wave
The propagation path for propagating catadioptric is analyzed.
(2) by single-ended detection to Mintrop wave head step-out time lightning strike spot can be positioned, will lightning stroke position away from M
The distance at end and the end M ' is denoted as x respectivelymWith xm’.In the case where lightning strike spot and flashover point are inconsistent, monitored at the end M (M ')
Subsequent wave head in and the Mintrop wave head polarity subsequent wave head that consistently first wave head is monitored by single-ended M (M ') in and it is first
The identical first wave head w of wave head polaritym、wnStep-out time carries out single end distance measurement, to determine lightning strike spot and flashover point
Position.
Two, lightning strike spot position is found out according to travelling wave ranging method
If the overall length after route expansion is l, when lightning fault occurs, initial traveling wave of being struck by lightning and fault traveling wave propagate to survey
It is t at the time of measuring end M (M ')0And t1, in conjunction with traveling wave propagation characteristic, both-end travelling wave ranging can be carried out according to the following formula.
xm'=l-xm (2)
In formula: Δ t=t1-t0；xmDistance for lightning strike spot away from measurement end M, v are experience velocity of wave.
Three, lightning strike spot and when inconsistent flashover point, positions flashover point
(1) consider that flashover point in the left and right side of lightning strike spot, draws traveling wave catadioptric network respectively.
(2) the traveling wave catadioptric network being located on the left of lightning strike spot according to flashover point and flashover point are located on the right side of lightning strike spot
Traveling wave catadioptric network map analysis can show that flashover point calculation formula is as follows:
The time t on lightning strike spot traveling wave Mintrop wave head arrival I loop line road0, I times wire time t of flashover point reflection wave arrival2。
Embodiment 1: lightning stroke is carried out using the simulation model established in Fig. 1 and differentiates simulation.In emulation by lightning strike spot be located at away from
At measurement point M end 20km, if Fig. 2 is that flashover point is located at the I on the left of lightning strike spot times and II loop line road A phase current waveform figure, it is
Convenient for image is further done subsequent processing, so the A phase current values on two loop line roads in Fig. 2 are presented on two figures respectively
In, as shown in Figure 3, Figure 4, according to above-mentioned analysis it is found that the t marked in figure0The wave head at moment is that lightning current passes through I loop line
Road reaches the initial traveling wave of measurement end M, t1The wave head polarity and t at moment0Moment wave head polarity is consistent, therefore t1Moment wave head is
Lightning current reaches the initial traveling wave of measurement end M (M '), t by II loop line road2Moment is back wave of the lightning current in flashover point.
Route overall length after multiple-circuit on same tower is unfolded is 2 × 60=120km, t0=68 μ s, t1=336 μ s are by formula
(1), it is x that (2), which can obtain distance measurement result,m=20.068km, error 68m, because error is smaller, can approximation ignore, be considered as
Lightning strike location is accurate.
By theoretical formula it is found that the positioning of lightning strike spot position is unrelated with the position of flashover point, therefore work as flashover point and lightning strike spot
When inconsistent, by taking lightning strike spot is on a loop line road as an example.No matter abort situation, that is, flashover point lightning strike spot left side or right side,
To the positioning of lightning strike spot without any influence, therefore, when flashover point is setting on the right side of lightning strike spot, can obtain same
Distance measurement result, accurate positioning.
Embodiment 2: it can show that flashover point calculation formula is as follows with Fig. 3 analysis according to fig. 2:
As shown in I loop line road waveform diagram, that is, Fig. 5, the meaning of the first two wave head hereinbefore makes elaboration, third to
Under negative polarity wave head be due to t1The wave head at moment, i.e. lightning current traveling wave reach the wave head of measurement end M by II loop line road,
The wave head for generating an opposite polarity can be coupled in I loop line road, and the current traveling wave of measurement end is propagated to I loop line road itself
Polarity causes the amplitude of finally formed negative polarity wave head also smaller on the contrary, counteracting thus can be generated.
Flashover point installs on the left of the lightning strike spot at 700 meters, i.e. at distance M measurement end 19.3km in emulation.t0=68 μ
S, t2=197 μ s, by t0、t1It brings formula (3) into and obtains xs=19.221km, error be 79 meters, because error is smaller, can approximation neglect
Slightly disregard, it is accurate to be considered as the i.e. flashover point location in fault point.When flashover point is located on the right side of lightning strike spot, equifinality can be obtained.
In conjunction with attached drawing, the embodiment of the present invention is explained in detail above, but the present invention is not limited to above-mentioned
Embodiment within the knowledge of a person skilled in the art can also be before not departing from present inventive concept
Put that various changes can be made.
Claims (1)
1. one kind is based on 110kV same tower double back transmission line lightning fault localization method, it is characterised in that:
Step1: when the part 110kV, multiple-circuit on same tower is struck by lightning, model of power transmission system is unfolded along the side N, M and M ' are same
One measurement end, N are opposite end bus, and the distance that position is held away from the end M and M ' that will be struck by lightning is denoted as x respectivelymWith xm’；
Step2: first wave head w identical with Mintrop wave head polarity in the subsequent wave head monitored by measurement end M (M ')m、wnIt arrives
Single end distance measurement is carried out up to the time difference, to position to lightning strike spot and flashover point；
Step3: straight line calibration is carried out to wave head using Hough transform；
Step4: the overall length after setting route expansion is l, and when lightning fault occurs, initial traveling wave of being struck by lightning and fault traveling wave are propagated to
It is t at the time of measurement end M (M ')0And t1, both-end travelling wave ranging is carried out according to the following formula:
xm'=l-xm
In formula, Δ t=t1-t0, xmDistance for lightning strike spot away from measurement end M, v are experience velocity of wave, xmIt is lightning strike spot away from measurement end M
Distance, xm'It is the distance of lightning strike spot range measurement end M '；
Step5: traveling wave catadioptric network is drawn；
Step6: flashover point can be obtained by being located at the traveling wave catadioptric network on the left of lightning strike spot according to flashover point are as follows:
In formula, xsFor flashover point.
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| CN201910548919.7A CN110376480A (en) | 2019-06-24 | 2019-06-24 | One kind being based on 110kV same tower double back transmission line lightning fault localization method |
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| CN201910548919.7A CN110376480A (en) | 2019-06-24 | 2019-06-24 | One kind being based on 110kV same tower double back transmission line lightning fault localization method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015094685A (en) * | 2013-11-13 | 2015-05-18 | 東北電力株式会社 | Method and system for locating power transmission line lighting failure point |
| CN207780159U (en) * | 2018-02-10 | 2018-08-28 | 新乡市中宝电气有限公司 | Identification lightning fault property and the device for being accurately positioned fault point |
| CN109470989A (en) * | 2018-10-11 | 2019-03-15 | 昆明理工大学 | A kind of lightning fault route selection and localization method based on the part 110kV multiple-circuit on same tower |
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2019
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015094685A (en) * | 2013-11-13 | 2015-05-18 | 東北電力株式会社 | Method and system for locating power transmission line lighting failure point |
| CN207780159U (en) * | 2018-02-10 | 2018-08-28 | 新乡市中宝电气有限公司 | Identification lightning fault property and the device for being accurately positioned fault point |
| CN109470989A (en) * | 2018-10-11 | 2019-03-15 | 昆明理工大学 | A kind of lightning fault route selection and localization method based on the part 110kV multiple-circuit on same tower |
Non-Patent Citations (3)
| Title |
|---|
| 余多: ""同塔双回直流输电线路雷击辨识分析与故障测距"", 《中国优秀硕士学位论文全文数据库·工程科技Ⅱ辑》 * |
| 张广斌等: ""基于Hough变换直线检测的行波波头标定"", 《中国电机工程学报》 * |
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Application publication date: 20191025 |