CN103235192A - Analysis method for harmful lightning probability distribution - Google Patents
Analysis method for harmful lightning probability distribution Download PDFInfo
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- CN103235192A CN103235192A CN2013100083688A CN201310008368A CN103235192A CN 103235192 A CN103235192 A CN 103235192A CN 2013100083688 A CN2013100083688 A CN 2013100083688A CN 201310008368 A CN201310008368 A CN 201310008368A CN 103235192 A CN103235192 A CN 103235192A
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Abstract
An analysis method for harmful lightning probability distribution is used for performing statistical analysis of amplitude and density of harmful lightning in a study area and drawing a corresponding lightning damage risk map. According to shielding harmful lightning current amplitude and counter harmful lightning current amplitude, lighting intensity in the area is counted, and the lightning area is level graded based on the density of harmful lightning current; the designated area is divided based on grid sizes, harmful lightning frequency of an area corresponding to each grid within a certain period is counted to get harmful lightning density and lightning area level of the area corresponding to each grid; and a harmful lightning level distribution map with different voltage levels is drawn. The analysis method for the harmful lighting probability distribution is capable of accurately and efficiently drawing the harmful lightning distribution map so as to provide a reference for lightning protection management of an existing line and for planning of an unbuilt line. Furthermore, a traditional way of using a manual observation mode to divide lightning activity characteristics can be completely replaced.
Description
Technical field
The present invention relates to electrical network power transmission and transforming equipment shocking preventing technology field, is harmful thunder and lightning probability distribution analytical approach that the harmful thunder and lightning probability distribution of a kind of application is drawn electric network thunderstorm damage risk distribution figure specifically.
Background technology
Overhead transmission line suffers the thunderbolt situation comparatively frequent in recent years, the tripping operation number of times that circuit causes because of thunderbolt, almost the line is busy road tripping operation sum near half.Research for thunder and lightning at present seriously lags behind power grid construction, once there was the saying of heavy minefield, area with less lightning activities in meteorological department, obtain the lightening activity data with artificial observation, according to lightening activity occurrence number number, thunder and lightning day fate how much divide the damage to crops caused by thunder grade, have very big limitation, little at the electrical network reference significance.Divide the damage to crops caused by thunder size " the thunder and lightning day " that power department applicating atmosphere department obtains with artificial observation and itself can not characterize the lightening activity feature fully, directive function is limited.
Rely on detection means such as lightning location system at present, carried out the thunder and lightning Study on geographical distribution, draw electrical network thunderbolt density profile according to the thunderbolt Density Distribution, but this distribution plan is mainly drawn with lightning location system statistics thunderbolt density, just characterized ground thunderbolt density, and the lightning protection capability of unreacted transmission line of electricity, there are problems such as guiding, that specific aim is not strong.Therefore, be necessary on the basis to the lightning parameter statistical study, in conjunction with the electrical network concrete condition, determine shielding under the different electric pressures, the harmful lightning current section of counterattack, analyze harmful amplitude of lightning current and density probability distribution, damage to crops caused by thunder is distributed carry out classification, draw the harmful thunder and lightning distribution plan of electrical network.
Summary of the invention
Technical matters to be solved by this invention is to overcome the existing thunderbolt density analysis method that utilizes to draw the deficiency that the thunderbolt density profile exists, and a kind of damage to crops caused by thunder risk analysis method based on harmful thunder and lightning probability distribution is provided.
Described harmful thunder and lightning probability distribution analytical approach is used for harmful thunder and lightning amplitude and the density of survey region are carried out statistical study, and draws corresponding damage to crops caused by thunder risk distribution figure, it is characterized in that described method comprises the following steps:
A. cause the lightning withstand level of shielding tripping operation and counterattack tripping operation according to different electric pressure transmission lines of electricity, determine the harmful amplitude of lightning current of shielding and the harmful amplitude of lightning current of counterattack;
B. according to the harmful amplitude of lightning current of described shielding and the harmful amplitude of lightning current of counterattack, use local amplitude of lightning current probability calculation formula and calculate the harmful thunder and lightning of shielding and the harmful thunder and lightning distribution probability of counterattack;
C. according to the harmful thunder and lightning of described shielding and the harmful thunder and lightning distribution probability of counterattack, the thunderbolt density of statistics this area is carried out minefield grade classification to harmful lightning current by density;
D. set the sizing grid of damage to crops caused by thunder risk distribution figure, and according to sizing grid the appointed area is divided, add up the harmful thunderbolt number of times of each grid The corresponding area in a time period, calculate harmful thunderbolt density and the minefield grade of each grid The corresponding area;
E. according to harmful thunderbolt density and the minefield level data result of different voltage levels, draw harmful thunder and lightning ranking score Butut of different voltage levels.
Harmful thunder and lightning probability distribution analytical approach of the present invention can be handled by the data to lightning location system, draw harmful thunder and lightning amplitude and the Density Distribution of appointed area, draw harmful thunder and lightning distribution plan accurately, for line design and operation maintenance and technological transformation provide foundation, thereby instruct the lightning protection of this area.More the drafting of precise and high efficiency is harmful to the thunder and lightning distribution plan, and the planning of administering and not building circuit for the lightning protection of building circuit provides reference frame.Can replace traditional artificial observation mode fully and divide the mode of lightening activity feature.
Embodiment
The present invention is further described below in conjunction with embodiment: the present invention has overcome the existing thunderbolt density analysis method that utilizes and has drawn the deficiency that the thunderbolt density profile exists.Be achieved through the following technical solutions, step is as follows:
1, determines harmful amplitude of lightning current
Cause the lightning withstand level that shielding tripping operation and counterattack are tripped according to different electric pressure transmission lines of electricity, determine the harmful amplitude of lightning current scope of shielding and the harmful amplitude of lightning current scope of counterattack.
Harmful lightning current refers to destroy the transmission line of electricity dielectric level, causes the electric current of lightning strike accident (fault).In natural thunderbolt, not all lightning current all can cause transmission line of electricity accident or fault, and only the thunderbolt in some current amplitude scope just can cause lightning strike accident (fault).
The accident (fault) that circuit generation lightning stroke trip causes has two kinds, is respectively shielding tripping operation, counterattack tripping operation, and therefore harmful lightning current comprises that shielding is harmful to lightning current, the harmful lightning current of counterattack.
(1) the harmful amplitude of lightning current scope of shielding
According to power industry standard " overvoltage protection of alternating-current electric device and Insulation Coordination (DL/T620-1997) ", the harmful amplitude of lightning current lower limit computing formula of shielding as shown in the formula:
U in the following formula (1)
50%Expression insulator chain 50% impulse sparkover voltage by calculating, is limited to 12kA(according to " power engineering high voltage circuit design manual " second edition, corresponding U under the harmful amplitude of lightning current of 220kV transmission line of electricity shielding
50%Be 1200kV); Be limited to 21kA(according to " power engineering high voltage circuit design manual " second edition, corresponding U under the harmful amplitude of lightning current of 500kV transmission line of electricity shielding
50%Be 2100kV).
For the harmful amplitude of lightning current upper limit of shielding, use electric geometric model method and in conjunction with operating experience, determine that the harmful amplitude of lightning current of 220kV transmission line of electricity shielding is limited to 40kA up and down, is limited to 50kA on the harmful amplitude of lightning current of 500kV transmission line of electricity shielding.
The harmful lightning current scope of 220kV circuit shielding is [12kA, 40kA];
The harmful lightning current scope of 500kV circuit shielding is [21kA, 50kA].
(2) the harmful amplitude of lightning current scope of counterattack
According to power industry standard " overvoltage protection of alternating-current electric device and Insulation Coordination (DL/T620-1997) " requirement, 500kV circuit counterattack lightning withstand level should be not less than 125kA, 220kV circuit counterattack lightning withstand level should be not less than 75kA, determines that the harmful amplitude of lightning current scope of 500kV circuit counterattack is for being not less than 125kA; The harmful amplitude of lightning current scope of 220kV circuit counterattack is for being not less than 75kA.
2, calculate harmful thunder and lightning distribution probability
Use local amplitude of lightning current probability calculation formula and calculate harmful thunder and lightning distribution probability PI(that lightning current is I I).
If there is not local amplitude of lightning current probability calculation formula, then according to " overvoltage protection of alternating-current electric device and Insulation Coordination (DL/T620-1997) " appendix C recommended formula, the probability that the general regional amplitude of lightning current of China surpasses I is calculated as follows.
lgP=-I/88 （2）
Letter P represents harmful thunder and lightning distribution probability, and alphabetical I is harmful lightning current.
Be example with the Hubei province:
Hubei province amplitude of lightning current probability calculation formula is formula as follows.
Ｐ
I(>I)＝1/[1+(I/32.592)
2.811] （3）
The shielding of Hubei province 220kV circuit is harmful to the thunder and lightning probability P
I1Computing method are as follows:
Ｐ
I1(>12kA)=1/[1+(12/32.592)
2.811]=94.9%
Ｐ
I1(>40kA)=1/[1+(40/32.592)
2.811]=36.2%
P then
I1(12kA≤I≤40kA)=94.9%-36.2%=58.7%
Then the shielding of Hubei province 220kV circuit is harmful to the thunder and lightning probability P
I1=58.7%.
The harmful thunder and lightning probability P of Hubei province 220kV circuit counterattack
I2Calculate:
Ｐ
I2(>75kA)＝1/[1+(75/32.592)
2.811]=8.3%。
Then the counterattack of Hubei province 220kV circuit is harmful to the thunder and lightning probability P
I2=8.3%
Can calculate the harmful thunder and lightning probability P of Hubei province 500kV circuit shielding with identical method
I1(20＜I≤50kA)=56.4%; The harmful thunder and lightning probability P of Hubei province 500kV circuit counterattack
I22(〉 125kA)=1.7%.
3, harmful lightning current is carried out classification by density
The harmful thunder and lightning Density Distribution of shielding and the harmful thunder and lightning Density Distribution of counterattack are divided into 4 grades, are labeled as 1,2,3,4 grade from low to high successively with arabic numeral.The density calculation formula is as follows:
N
gc1=N
gP
I1 （4）
N
gc2=N
gP
I2 （5）
N
Gc1Be the harmful thunder and lightning density of shielding;
N
Gc2For strikeing back harmful thunder and lightning density;
PI1 is the amplitude of lightning current probability of amplitude of lightning current between the harmful lightning current upper limit of shielding and lower range, and its value is calculated according to formula (2), and computing method are with reference to Hubei province;
PI2 is for surpassing the amplitude of lightning current probability of the harmful amplitude of lightning current scope of counterattack, and its value is calculated according to formula (2), and computing method are with reference to Hubei province;
N
gFor ground dodges density value, its value is got 0.78,2.78,7.98 respectively and is set grade.
Shielding is harmful to thunder and lightning density (N
1) stage division:
1 grade of minefield: N
1＜P
I1* 0.78
2 grades of minefield: P
I1* 0.78≤N
1＜P
I1* 2.78
3 grades of minefield: P
I1* 2.78≤N
1＜P
I1* 7.98
4 grades of minefield: N
1〉=P
I1* 7.98
The harmful thunder and lightning density (N of counterattack
2) stage division:
1 grade of minefield: N
2＜P
I2* 0.78
2 grades of minefield: P
I2* 0.78≤N
2＜P
I2* 2.78
3 grades of minefield: P
I2* 2.78≤N
2＜P
I2* 7.98
4 grades of minefield: N
2〉=P
I2* 7.98
4, set grid and calculate harmful thunderbolt density of each grid The corresponding area
Set the sizing grid of damage to crops caused by thunder risk distribution figure, and according to sizing grid the appointed area is divided, add up the harmful thunderbolt number of times of each grid The corresponding area in a time period, calculate harmful thunderbolt density of each grid The corresponding area.According to the harmful thunder and lightning density classification results in front, determine each grid corresponding region damage to crops caused by thunder rank.
5, harmful thunder and lightning distribution plan is drawn
According to the difference of electric pressure, harmful thunder and lightning distribution plan can be divided into the harmful thunder and lightning distribution plan of 220kV electrical network shielding and the harmful thunder and lightning distribution plan of counterattack, the harmful thunder and lightning distribution plan of 500kV electrical network shielding and the harmful thunder and lightning distribution plan of counterattack.When graphing, different color representatives can be adopted in the minefield of different brackets.
Claims (1)
1. a harmful thunder and lightning probability distribution analytical approach is used for harmful thunder and lightning amplitude and the density of survey region are carried out statistical study, and draws corresponding damage to crops caused by thunder risk distribution figure, it is characterized in that described method comprises the following steps:
A. cause the lightning withstand level of shielding tripping operation and counterattack tripping operation according to different electric pressure transmission lines of electricity, determine the harmful amplitude of lightning current of shielding and the harmful amplitude of lightning current of counterattack;
B. according to the harmful amplitude of lightning current of described shielding and the harmful amplitude of lightning current of counterattack, use local amplitude of lightning current probability calculation formula and calculate the harmful thunder and lightning of shielding and the harmful thunder and lightning distribution probability of counterattack;
C. according to the harmful thunder and lightning of described shielding and the harmful thunder and lightning distribution probability of counterattack, the thunderbolt density of statistics this area is carried out minefield grade classification to harmful lightning current by density;
D. set the sizing grid of damage to crops caused by thunder risk distribution figure, and according to sizing grid the appointed area is divided, add up the harmful thunderbolt number of times of each grid The corresponding area in a time period, calculate harmful thunderbolt density and the minefield grade of each grid The corresponding area;
E. according to harmful thunderbolt density and the minefield level data result of different voltage levels, draw harmful thunder and lightning ranking score Butut of different voltage levels.
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| CN108009351A (en) * | 2017-11-30 | 2018-05-08 | 国网湖南省电力有限公司 | The distribution drawing drawing method of lightning stroke trip risk |
| CN108416450A (en) * | 2018-02-10 | 2018-08-17 | 杭州后博科技有限公司 | A kind of recognition methods of steel tower security risk and system based on lightning stroke data |
| CN108596427A (en) * | 2018-03-09 | 2018-09-28 | 国网上海市电力公司 | A kind of method for drafting of transmission line lightning stroke risk rating scheme |
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| CN108009351A (en) * | 2017-11-30 | 2018-05-08 | 国网湖南省电力有限公司 | The distribution drawing drawing method of lightning stroke trip risk |
| CN108416450A (en) * | 2018-02-10 | 2018-08-17 | 杭州后博科技有限公司 | A kind of recognition methods of steel tower security risk and system based on lightning stroke data |
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Application publication date: 20130807 |