CN109190243A - A kind of Lightning stroke Protection Measures for Over-Head Lines selection method based on Evaluation formula - Google Patents
A kind of Lightning stroke Protection Measures for Over-Head Lines selection method based on Evaluation formula Download PDFInfo
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Abstract
The present invention provides a kind of Lightning stroke Protection Measures for Over-Head Lines selection method based on Evaluation formula, concrete condition based on every base shaft tower, lightning protection measures optimum choice is carried out to electric power line pole tower using Evaluation formula, both objective factor is considered, also in relation with subjective experience and demand, the Lightning stroke Protection Measures for Over-Head Lines of optimization can be reliably obtained.
Description
Technical field
The present invention relates to transmission line of electricity anti-thunder technical field more particularly to a kind of transmission line of electricity based on Evaluation formula are anti-
Thunder Measure choice method.
Background technique
In recent years, the operation of power networks faults frequent due to caused by lightning stroke occurs, and be struck by lightning line caused by overhead transmission line
It is the major accident type of China's transmission line of electricity that road, which has a power failure,.Many transmission lines of electricity inevitably will be through excessive thunder, electric resistance of soil
Rate height, area with a varied topography must take various lightning protection measures to mention to reduce the lightning stroke trip of these regional transmission lines of electricity
The resistance to thunder of high transmission line of electricity is horizontal.In short supply with line corridor, common-tower double-return or more back transmission lines are increasing, and shaft tower is high
Degree increases；And due to the construction of highway, the data of the high shaft tower of Great span are sharply increased, these factors all make transmission line of electricity
The probability that shaft tower is struck by lightning increases considerably.Have for above situation and takes effective measures to improve the lightning protection properties of route
(such as reduction pole tower ground resistance reinforces dielectric level, sets up coupling ground wire, installation lightning rod for lightning shielding failure, installation leakage conductor
Lightning protection measures).The application purpose of various lightning protection measures and effect after implementation are different, and different regions are implemented difference and arranged
Expense, the difficulty applied also are not quite similar.
But in practical projects, many areas still use the Lightning Transformation way to manage of extensive style, do not consider power transmission line
The characteristics of road and lightning protection measures, the single lightning protection measures of the selection of indifference are administered, so that regulation effect is not significant, were transformed
Shaft tower need to carry out secondary transformation, waste manpower and material resources significantly.There are the influences of the subjectivity of people for lightning protection measures assessment models
Too greatly, the deficiencies of influence factor considered is not comprehensive enough, cannot objectively, reliably assess the application effect of lightning protection measures.
Therefore, before carrying out Lightning Transformation, comprehensive assessment is carried out to lightning protection measures, according to assessment result selection technique economy
The higher measure of type is to improve the key link of Lightning Transformation effect, and the present invention proposes a kind of based on the defeated of Evaluation formula
Electric line lightning protection measures selection method.
Summary of the invention
The Lightning stroke Protection Measures for Over-Head Lines selection method based on Evaluation formula that the purpose of the present invention is to provide a kind of, with solution
Certainly the problems mentioned above in the background art.
The present invention is achieved by the following technical solutions: a kind of Lightning stroke Protection Measures for Over-Head Lines choosing based on Evaluation formula
Selection method, comprising the following steps:
S1: obtaining the corresponding data information of corresponding area transmission line of electricity and shaft tower, calculates the every base of this area's transmission line of electricity
The tripping rate with lightning strike X of shaft tower；
S2: determining the Con trolling index P of corresponding area transmission line lightning stroke trip-out rate X, according to transmission line lightning stroke trip-out rate X
With the relationship between Con trolling index P, the risk class of transmission line of electricity is divided, and is prevented according to risk class determination
The base shaft tower of thunder transformation；
S3: establishing the lightning protection measures optimum choice Comprehensive Analysis Model of Unit for being directed to the base shaft tower, determines that the base shaft tower is anti-
The evaluation index of thunder measure, and score the evaluation index, and establish the decision matrix based on Evaluation formula；
S4: the weight of the evaluation index is determined according to analytic hierarchy process (AHP), and carries out consistency check；
S5: the entropy weight of the evaluation index, the objective weight of as each index are determined with entropy assessment；
S6: determining the combining weights of each index with Evaluation formula, and final preferred result is obtained by calculation.
Preferably, in step S1, the corresponding data information includes electric power line pole tower number, shaft tower model, shaft tower longitude and latitude
Degree, shaft tower exhale the structure chart of each shaft tower in height, span, landform, ground resistance, CG lightning density and transmission line of electricity；Including power transmission line
Wire type, wire radius, conducting wire D.C. resistance, conducting wire division number and the wire spacing on road；It further include earth wire of power transmission line type
Number, ground wire radius, ground wire D.C. resistance, insulator chain model, length, dry arcing distance information.
Preferably, data are opened according to the root that the structure chart of each shaft tower obtains each shaft tower；According to the shaft tower longitude and latitude
Determine the soil resistivity of the left-leaning angle of every base shaft tower, Right deviation angle, height above sea level and shaft tower；It is calculated according to the span between shaft tower
The conducting wire sag of every base shaft tower and ground wire arc sag out.
Preferably, electric power line pole tower tripping rate with lightning strike model, thunder and lightning flow model, transmission of electricity are established in analogue simulation software
Circuit model, Tower Model, ground resistance model and insulator strings flashover model, and by transmission line of electricity and the corresponding data of shaft tower
The back flash-over rate and counterattack trip-out rate of every base shaft tower are obtained in the above-mentioned model of information input, the back flash-over rate and counterattack are jumped
The sum of lock rate is tripping rate with lightning strike X.
Preferably, in step S2, the Con trolling index P of each department tripping rate with lightning strike X is determined according to the thunderstorm day of each department,
According to the relationship between transmission line lightning stroke trip-out rate X and Con trolling index P, by the risk class of transmission line of electricity be divided into A, B, C,
D level Four, wherein A grades of ranges are X < 0.5P；B grades of ranges are 0.5P≤X < P；C grades of ranges are P≤X < 1.5P；D grades of models
It encloses for X >=1.5P determines risk class of the tripping rate with lightning strike X more than or equal to Con trolling index P to need to carry out Lightning Transformation
Base shaft tower.
Preferably, in step S3, the evaluation index includes that the reducing effect, engineering cost, transformation of tripping rate with lightning strike X is difficult
Yi Du, maintenance difficulty and service life, the decision matrix of the foundation based on Evaluation formula include the following steps:
S31, discussion scope for the factors U={ u is established according to lightning protection measures1, u2..., un}；
S32, comment domain V={ V is established according to evaluation index1, V2..., Vm}；
S33, single factor evaluation is carried out according between discussion scope for the factors U and comment domain V, establishes following index level matrix:
Wherein, i takes 1,2,3 ..., m；J takes 1,2,3 ..., n.
S34, the characteristic value of the index level matrix is normalized using following formula:
rij=xij/maxXij
rij=maxXij/Xij
S35, according to the characteristic value normalization processing result, obtain following normalization matrix R:
Preferably, in step S4, the weight of the evaluation index is determined with analytic hierarchy process (AHP), and carry out consistency check
The step of are as follows:
S41, judgment matrix is established, by comparing two-by-two to index, to the relative importance of each index in same level
Judged, it is as follows to list judgment matrix:
Vi: Vj=aij
A=(aij)n*m
In formula, ViFor an evaluation index, VjFor another evaluation index, aijFor scale, judgment criteria are as follows: when scale is
When 1, indicate that two indexes have property of equal importance；When scale is 3, a is indicatediCompare ajIt is slightly important；When scale is 5, a is indicatedi
Compare ajIt is obvious important；When scale is 7, a is indicatediCompare ajIt is strong important；When scale is 9, a is indicatediCompare ajIt is extremely important；
The feature vector of the Maximum characteristic root of S42, calculating judgment matrix A, which is weight vectors w1；
S43, consistency check is carried out to judgment matrix A.
Preferably, in step S5, the step of objective weight that indices are determined with entropy assessment, is as follows:
S51, the specific gravity P for calculating j-th of evaluation of estimate under i-th of factorij:
In formula, rijFor the characteristic value of normalization matrix, n is evaluation index.
S52, the entropy e for calculating i-th of factori:
S53, the coefficient of variation g for calculating i-th of factori:
gi=1-ei
S54, flexible strategy w is definedij:
In formula, wjIt is exactly the weight that entropy assessment determines, i.e. weight vectors w2。
Preferably, the combining weights that each index is determined with Evaluation formula, are calculated using following formula:
W=α * w1+β*w2
In formula, α is the relative importance of analytic hierarchy process (AHP), and β is the relative importance of entropy assessment, is finally calculated each anti-
The comprehensive evaluation value E=U*W of thunder measure, evaluation of estimate is bigger, then the priority for representing the lightning protection measures is high.
Compared with prior art, what the present invention reached has the beneficial effect that:
A kind of Lightning stroke Protection Measures for Over-Head Lines selection method based on Evaluation formula provided by the invention is based on every base shaft tower
Concrete condition, using Evaluation formula to electric power line pole tower carry out lightning protection measures optimum choice, both consider objective factor,
Also in relation with subjective experience and demand, the Lightning stroke Protection Measures for Over-Head Lines of optimization can be reliably obtained.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only the preferred embodiment of the present invention, for
For those of ordinary skill in the art, without any creative labor, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 is a kind of process of the Lightning stroke Protection Measures for Over-Head Lines selection method based on Evaluation formula provided by the invention
Figure.
Fig. 2 is opinion rating provided in an embodiment of the present invention.
Specific embodiment
In order to be best understood from the technology of the present invention content, be provided below specific embodiment, and in conjunction with attached drawing to the present invention do into
The explanation of one step.
Referring to Fig. 1, a kind of Lightning stroke Protection Measures for Over-Head Lines selection method based on Evaluation formula, comprising the following steps:
S1: obtaining the corresponding data information of corresponding area transmission line of electricity and shaft tower, calculates the every base of this area's transmission line of electricity
The tripping rate with lightning strike X of shaft tower；
S2: determining the Con trolling index P of corresponding area transmission line lightning stroke trip-out rate X, according to transmission line lightning stroke trip-out rate X
With the relationship between Con trolling index P, the risk class of transmission line of electricity is divided, and is prevented according to risk class determination
The base shaft tower of thunder transformation；
S3: establishing the lightning protection measures optimum choice Comprehensive Analysis Model of Unit for being directed to the base shaft tower, determines that the base shaft tower is anti-
The evaluation index of thunder measure, and score the evaluation index, and establish the decision matrix based on Evaluation formula；
S4: the weight of the evaluation index is determined according to analytic hierarchy process (AHP), and carries out consistency check；
S5: the entropy weight of the evaluation index, the objective weight of as each index are determined with entropy assessment；
S6: determining the combining weights of each index with Evaluation formula, and final preferred result is obtained by calculation.
Specifically, collecting electric power line pole tower number, shaft tower model, shaft tower longitude and latitude, shaft tower exhales height, span, landform, ground connection
The structure chart of each shaft tower in resistance, CG lightning density and transmission line of electricity；Collect wire type, wire radius, the conducting wire of transmission line of electricity
D.C. resistance, conducting wire division number and wire spacing；Collect ground wire model, ground wire radius, ground wire D.C. resistance, insulator string type
Number, length, the data of dry arcing distance, establish transmission line of lightning strike counting statistics database according to above-mentioned data；It can be according to shaft tower
The root that structure chart obtains each shaft tower is opened；Determined on Google Maps according to the longitude and latitude of shaft tower the left-leaning angle of shaft tower, Right deviation angle,
Height above sea level, and according to shaft tower geographical location, determine the soil property of shaft tower location, and soil is obtained according to identified soil property
Resistivity；By the span between shaft tower, the conducting wire sag and ground wire arc sag of shaft tower are calculated respectively according to span end angle method.
Electric power line pole tower tripping rate with lightning strike model is established in ATP-EMTP according to above-mentioned data, wherein shielding is tripped
Rate computation model uses electric geometry method, and counterattack trip-out rate computation model uses electromagnetic transient analysis model, thunder and lightning flow model
Using double exponential wave model of fit, model of power transmission system uses Jmarti circuit model, and Tower Model uses multi-wave impedance model,
Ground resistance model uses impulse earthed resistance model, and insulator strings flashover model is using first inducing defecation by enema and suppository model, then by the lightning stroke
After in the above-mentioned model that data input ATP-EMTP in transmission line of electricity counting statistics database is established, it can be calculated
The back flash-over rate and counterattack trip-out rate of every base shaft tower.
It is illustrated by taking the 110kV goose Aug. 1st line of Hainan Province Danzhou City as an example.
The data information for collecting Hainan Province Danzhou City 110kV goose Aug. 1st line first, obtains transmission line of lightning strike counting statistics
The transmission line lightning stroke trip-out rate computation model that data bring foundation into is obtained the red shielding for multiplying each shaft tower of line of 110kV by database
With counterattack trip-out rate.
According to the back flash-over rate of obtained shaft tower and counterattack trip-out rate, and according to " 110 (66) kV~500kV make somebody a mere figurehead defeated
Electric line management regulation " it provides in the 89th article: reduction to 40 thunderstorm days, 110kV transmission line lightning stroke trip-out rate should not
More than 0.525 time/hundred kilometers years, 220kV transmission line lightning stroke trip-out rate should be no more than 0.315 time/hundred kilometers years.With reference to
Above-mentioned standard, the Con trolling index P of each department tripping rate with lightning strike is determined in each department according to the thunderstorm day of this area, by power transmission line
Road flashover risk class is divided into A, B, C, D level Four according to the relationship between line tripping rate and Con trolling index, and A grades are overhead line structures
Trip-out rate reaches 0.5 times of Con trolling index hereinafter, B grades are line tripping rate up to 0.5-1 times of Con trolling index, and C grades are line tripping
Rate reaches 1-1.5 times of Con trolling index；D grades are line tripping rate up to 1.5 times or more of Con trolling index.Each shaft tower is subjected to power transmission line
The division of road flashover risk class determines that transmission line of electricity flashover risk class is that the shaft tower of C and D is determined as needing to carry out lightning protection
The shaft tower of transformation.The relationship of trip-out rate and risk class is as shown in table 1:
Table 1
| Trip-out rate X | X < 0.5P | 0.5P≤X < P | P≤X < 1.5P | X≥1.5P |
| Risk class | A | B | C | D |
Danzhou area tripping rate with lightning strike index is obtained according to " 110 (66) kV~500kV overhead transmission line management regulation "
Value is 1.588 times/hundred kilometers years, needs the shaft tower be transformed as shown in table 2 to select, always calculated in table 2 trip-out rate be around
Hit the sum of trip-out rate and counterattack trip-out rate.
Table 2
| Shaft tower number | Total trip-out rate | Shaft tower number | Total trip-out rate |
| 4 | 3.791861 | 82 | 4.3950519 |
| 5 | 2.646627 | 92 | 5.144301261 |
| 8 | 3.960634 | 94 | 3.856849675 |
| 9 | 4.463779 | 96 | 2.049131071 |
| 10 | 5.028104 | 98 | 2.075931893 |
| 18 | 4.187369 | 112 | 3.237186261 |
| 30 | 3.963629 | 116 | 4.701417786 |
| 34 | 4.834635 | 118 | 4.992479493 |
| 38 | 4.088855 | 120 | 4.586972769 |
| 40 | 3.570369 | 121 | 4.02927114 |
| 41 | 5.137339 | 122 | 4.827404539 |
| 42 | 3.167002 | 124 | 3.541846518 |
| 46 | 2.357284 | 126 | 3.721016855 |
| 47 | 2.686094 | 127 | 6.159973054 |
| 49 | 4.023722 | 129 | 3.106130596 |
| 51 | 3.413102 | 134 | 2.366930143 |
| 52 | 3.312272 | 135 | 2.833518571 |
| 54 | 3.111094 | 140 | 6.2369 |
| 57 | 2.107174 | 142 | 3.404039166 |
| 61 | 2.424097 | 147 | 3.399106748 |
| 63 | 2.61643 | 148 | 3.26593366 |
| 68 | 2.474414 | 149 | 4.909683961 |
| 70 | 4.149648 | 155 | 4.266774303 |
| 76 | 4.746829 | 159 | 1.853232786 |
| 80 | 3.592849 |
The data being struck by lightning for collecting 110kV goose Aug. 1st line former years obtain: the lightning stroke of 2010.5.10, #54 bar；#158
Bar drainage thread discharges to cross-arm；2010.7.8, P119 bar AB phase ceramics insulator is breakdown；2012.7.25, #2 angle pole B phase
Drainage is blown.So the shaft tower of required transformation, other than shown in table 3, there are also #2, #119, #158 shaft towers.
Specifically, in step s3, the evaluation index includes the reducing effect, engineering cost, transformation of tripping rate with lightning strike X
Difficulty, maintenance difficulty and service life, and the lightning protection measures that can be used are corresponded into five evaluations respectively
Index, the evaluation index are interval type index.Then the opinion rating that lightning protection measures correspond to evaluation index, opinion rating are divided
Be divided into 5 ranks, respectively correspond 5 standard values, i.e., it is low, lower, medium, higher, high, as shown in Fig. 2, the foundation is initial certainly
Plan matrix includes the following steps:
S31, discussion scope for the factors U={ u is established according to lightning protection measures1, u2..., un}；
S32, comment domain V={ V is established according to evaluation index1, V2..., Vm}；
S33, following initial decision matrix is established according to discussion scope for the factors U and comment domain V:
Wherein, i takes 1,2,3 ..., m；J takes 1,2,3 ..., n.
S34, the characteristic value of the index level matrix is normalized using following formula:
rij=xij/maxXij
rij=maxXij/Xij
S35, according to the characteristic value normalization processing result, obtain following normalization matrix R:
By taking #54 shaft tower as an example, each lightning protection measures are as shown in table 3 relative to the appraisal result of five evaluation indexes:
Table 3
Appraisal result described in table 3 is set as to the decision matrix of Evaluation formula.
Specifically, in step s 4, the weight of the evaluation index is determined with analytic hierarchy process (AHP), and carry out consistency inspection
The step of testing are as follows:
S41, judgment matrix is established, by comparing two-by-two to index, to the relative importance of each index in same level
Judged, it is as follows to list judgment matrix A:
Vi: Vj=aij
A=(aii)n*m
Substituting into data can get judgment matrix A:
In formula, ViFor an evaluation index, VjFor another evaluation index, aijFor scale, judgment criteria are as follows: when scale is
When 1, indicate that two indexes have property of equal importance；When scale is 3, a is indicatediCompare ajIt is slightly important；When scale is 5, a is indicatedi
Compare ajIt is obvious important；When scale is 7, a is indicatediCompare ajIt is strong important；When scale is 9, a is indicatediCompare ajIt is extremely important；
The feature vector of the Maximum characteristic root of S42, calculating judgment matrix A, which is weight vectors w1, calculating obtains
:
w1=[0.4659 0.2009 0.1555 0.0598 0.1179]T
S43, consistency check is carried out to judgment matrix A, obtains CI=0.0503, CR=0.0449, wherein CR < 0.1,
So meeting the requirements.
Specifically, in step s 5, the step of objective weight that indices are determined with entropy assessment, is as follows:
S51, the specific gravity P for calculating j-th of evaluation of estimate under i-th of factorij:
In formula, rijFor the characteristic value of normalization matrix, n is evaluation index.
S52, the entropy e for calculating i-th of factori:
S53, the coefficient of variation g for calculating i-th of factoriFor given eiBigger, the otherness of factor evaluation value is smaller,
Then the effect of factor volume played in overall merit is smaller, therefore, can define coefficient of variation gi=1-ei, then as factor giIt is bigger
When, factor is more important；
S54, flexible strategy w is definedij:
In formula, wjIt is exactly the weight that entropy assessment determines, i.e. weight vectors w2, being computed can obtain:
w2=[0.4041 0.1214 0.2113 0.0784 0.1848]T。
The combining weights that each index is determined with Evaluation formula, are calculated using following formula:
W=α * w1+β*w2
In formula, α be analytic hierarchy process (AHP) relative importance, can value 0.5, β be entropy assessment relative importance, can
Value 0.5, then can be obtained:
W=[0.435 0.16115 0.1834 0.0691 0.15135]T
Finally calculate the comprehensive evaluation value of each lightning protection measures:
E=U*W=[0.2240 0.1430 0.1760 0.1555 0.0691 0.15135]T
Evaluation of estimate is bigger, then the priority for representing the lightning protection measures is high, so by calculated result it is found that 110kV goose Aug. 1st
The lightning protection measures preferred sequence of line #54 shaft tower are as follows: 1. zinc oxide surge arresters；2. setting up coupling ground wire；3. installing portable protective gaps additional；4. adding
Strong dielectric level；5. reducing pole tower ground resistance；6. installing lightning-protection side needle.To this route, other need the shaft tower being transformed according to this
Step carries out analytical calculation, and the Lightning Transformation measure of whole route can be obtained.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.
Claims (9)
1. a kind of Lightning stroke Protection Measures for Over-Head Lines selection method based on Evaluation formula, which comprises the following steps:
S1: obtaining the corresponding data information of corresponding area transmission line of electricity and shaft tower, calculates the every base shaft tower of this area's transmission line of electricity
Tripping rate with lightning strike X；
S2: determining the Con trolling index P of corresponding area transmission line lightning stroke trip-out rate X, according to transmission line lightning stroke trip-out rate X and control
Relationship between index P processed divides the risk class of transmission line of electricity, and determines that needing to carry out lightning protection changes according to the risk class
The base shaft tower made；
S3: the lightning protection measures optimum choice Comprehensive Analysis Model of Unit for being directed to the base shaft tower is established, determines that the base shaft tower lightning protection is arranged
The evaluation index applied, and score the evaluation index, and establish the decision matrix based on Evaluation formula；
S4: the weight of the evaluation index is determined according to analytic hierarchy process (AHP), and carries out consistency check；
S5: the entropy weight of the evaluation index, the objective weight of as each index are determined with entropy assessment；
S6: determining the combining weights of each index with Evaluation formula, and final preferred result is obtained by calculation.
2. a kind of Lightning stroke Protection Measures for Over-Head Lines selection method based on Evaluation formula according to claim 1, feature
It is, in step S1, the corresponding data information includes that electric power line pole tower number, shaft tower model, shaft tower longitude and latitude, shaft tower are exhaled
The structure chart of each shaft tower in height, span, landform, ground resistance, CG lightning density and transmission line of electricity；Lead-type including transmission line of electricity
Number, wire radius, conducting wire D.C. resistance, conducting wire division number and wire spacing；It further include earth wire of power transmission line model, ground wire half
Diameter, ground wire D.C. resistance, insulator chain model, length, dry arcing distance information.
3. a kind of Lightning stroke Protection Measures for Over-Head Lines selection method based on Evaluation formula according to claim 2, feature
It is, data is opened according to the root that the structure chart of each shaft tower obtains each shaft tower；Every base shaft is determined according to the shaft tower longitude and latitude
The left-leaning angle of tower, Right deviation angle, height above sea level and shaft tower soil resistivity；Every base shaft tower is calculated according to the span between shaft tower
Conducting wire sag and ground wire arc sag.
4. a kind of Lightning stroke Protection Measures for Over-Head Lines selection method based on Evaluation formula according to claim 3, feature
Be, established in analogue simulation software electric power line pole tower tripping rate with lightning strike model, thunder and lightning flow model, model of power transmission system,
Tower Model, ground resistance model and insulator strings flashover model, and by the corresponding data information input of transmission line of electricity and shaft tower
The back flash-over rate and counterattack trip-out rate of every base shaft tower, the sum of the back flash-over rate and counterattack trip-out rate are obtained in above-mentioned model
For tripping rate with lightning strike X.
5. a kind of Lightning stroke Protection Measures for Over-Head Lines selection method based on Evaluation formula according to claim 4, feature
It is, in step S2, the Con trolling index P of each department tripping rate with lightning strike X is determined according to the thunderstorm day of each department, according to power transmission line
Relationship between road tripping rate with lightning strike X and Con trolling index P, is divided into A, B, C, D level Four for the risk class of transmission line of electricity,
In, A grades of ranges are X < 0.5P；B grades of ranges are 0.5P≤X < P；C grades of ranges are P≤X < 1.5P；D grades of ranges are, X >=
1.5P, judgement tripping rate with lightning strike X are greater than or equal to the risk class of Con trolling index P for the base shaft tower for needing to carry out Lightning Transformation.
6. a kind of Lightning stroke Protection Measures for Over-Head Lines selection method based on Evaluation formula according to claim 5, feature
It is, in step S3, the evaluation index includes the reducing effect, engineering cost, transformation difficulty, maintenance of tripping rate with lightning strike X
Difficulty and service life, the decision matrix of the foundation based on Evaluation formula include the following steps:
S31, discussion scope for the factors U={ u is established according to lightning protection measures1, u2..., un}；
S32, comment domain V={ V is established according to evaluation index1, V2..., Vm}；
S33, single factor evaluation is carried out according between discussion scope for the factors U and comment domain V, establishes following index level matrix:
Wherein, i takes 1,2,3 ..., m；J takes 1,2,3 ..., n.
S34, the characteristic value of the index level matrix is normalized using following formula:
rij=xij/maxXij
rij=maxXij/Xij
S35, according to the characteristic value normalization processing result, obtain following normalization matrix R:
7. a kind of Lightning stroke Protection Measures for Over-Head Lines selection method based on Evaluation formula according to claim 6, feature
It is, in step S4, the weight of the evaluation index, and the step of carrying out consistency check is determined with analytic hierarchy process (AHP) are as follows:
S41, judgment matrix is established, by comparing two-by-two to index, the relative importance of each index in same level is carried out
Judgement, it is as follows to list judgment matrix:
Vi: Vj=aij
A=(aij)n*m
In formula, ViFor an evaluation index, VjFor another evaluation index, aijFor scale, judgment criteria are as follows: when scale is 1,
Indicate that two indexes have property of equal importance；When scale is 3, a is indicatediCompare ajIt is slightly important；When scale is 5, a is indicatediCompare aj
It is obvious important；When scale is 7, a is indicatediCompare ajIt is strong important；When scale is 9, a is indicatediCompare ajIt is extremely important；
The feature vector of the Maximum characteristic root of S42, calculating judgment matrix A, which is weight vectors w1；
S43, consistency check is carried out to judgment matrix A.
8. a kind of Lightning stroke Protection Measures for Over-Head Lines selection method based on Evaluation formula according to claim 7, feature
It is, in step S5, the step of objective weight that indices are determined with entropy assessment is as follows:
S51, the specific gravity P for calculating j-th of evaluation of estimate under i-th of factorij:
In formula, rijFor the characteristic value of normalization matrix, n is evaluation index.
S52, the entropy e for calculating i-th of factori:
S53, the coefficient of variation g for calculating i-th of factori:
gi=1-ei
S54, flexible strategy w is definedij:
In formula, wjIt is exactly the weight that entropy assessment determines, i.e. weight vectors w2。
9. a kind of Lightning stroke Protection Measures for Over-Head Lines selection method based on Evaluation formula according to claim 8, feature
It is, the combining weights of each index is determined with Evaluation formula, are calculated using following formula:
W=α * w1+β*w2
In formula, α is the relative importance of analytic hierarchy process (AHP), and β is the relative importance of entropy assessment, finally calculates each lightning protection and arranges
The comprehensive evaluation value E=U*W applied, evaluation of estimate is bigger, then the priority for representing the lightning protection measures is high.
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