CN106451307B - The method that 10KV distribution overhead lines are taken shelter from the thunder - Google Patents
The method that 10KV distribution overhead lines are taken shelter from the thunder Download PDFInfo
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- CN106451307B CN106451307B CN201610983328.9A CN201610983328A CN106451307B CN 106451307 B CN106451307 B CN 106451307B CN 201610983328 A CN201610983328 A CN 201610983328A CN 106451307 B CN106451307 B CN 106451307B
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- 238000009826 distribution Methods 0.000 title claims abstract description 36
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- 101100499229 Mus musculus Dhrsx gene Proteins 0.000 claims abstract description 6
- 238000009434 installation Methods 0.000 claims abstract description 4
- 238000009413 insulation Methods 0.000 claims abstract description 3
- 208000025274 Lightning injury Diseases 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 3
- 210000003205 muscle Anatomy 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 229910052573 porcelain Inorganic materials 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000018927 edible plant Nutrition 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 229960001296 zinc oxide Drugs 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
Abstract
The invention belongs to a kind of methods that distribution network construction field more particularly to 10KV distribution overhead lines are taken shelter from the thunder.A, the information of 10KV distribution overhead lines is collected first, and the information of the distribution line includes the dielectric level of the height of shaft tower, the distance of shaft tower, the height of lightning conducter, the installation site of arrester and circuit；B, it according to collecting come the information of 10KV distribution overhead lines, establishes relevant model using PSCAD and EMTDC and constructs the circuit of 7 base shaft towers；C, the flashover number of circuit both sides is calculated；D, influence and line insulation level of the shaft tower height to tripping rate with lightning strike are calculated to tripping rate with lightning strike according to line flashover number, and then choose the shaft tower and insulator of proper height, the present invention has the purpose for being optimal lightning-arrest effect with least cost, this method is easy to operate, it is all operable for those skilled in the art, large-scale promotion is suitble to use.
Description
Technical field
The invention belongs to a kind of methods that distribution network construction field more particularly to 10KV distribution overhead lines are taken shelter from the thunder.
Background technology
With the continuous development of science and technology, people’s lives are supplied electricity to and bring variation with rapid changepl. never-ending changes and improvements, in order to make people
It can be protected in terms of electricity consumption, the construction of power distribution network dominated by State Grid Corporation of China and Southern Power Grid Company is such as fire
Such as the progress of the bitter edible plant, 10KV distribution lines with the distribution line of user's end in contact in the construction of entire power distribution network as directly occupying
Very important status, however, since the features such as distribution of 10KV distribution lines is wide, dielectric level is low also becomes power distribution network tripping
The most circuit of number, main cause are exactly to be struck by lightning, lightning stroke not only can distribution line interrupt, also result in controller switching equipment and use
Family equipment damage or even personal injury is caused, heavy losses are brought to industrial and agricultural production.
In order to solve the problem of lightning of 10KV distribution overhead lines, there has been proposed various methods, for example, installation
Arrester, lightning conducter, the insulativity etc. for improving circuit, although however, these above-mentioned methods can be to a certain extent
Lightning-arrest effect is played, still, with certain blindness, in order to reach lightning-arrest effect, people generally can be by these equipment
Setting, and then the cost of distribution network construction is improved, and effectively cannot provide a kind of rational method for circuit, make to take shelter from the thunder
Expense achievees the effect that best lightning-arrest in the case of minimum.
Invention content
The present invention there is technical issues that for above-mentioned 10KV distribution overhead lines on lightning measure, propose one
The method that the good and lightning-arrest 10KV distribution overhead lines at low cost of simple, the lightning-arrest effect of kind reasonable design, method are taken shelter from the thunder.
In order to achieve the above object, the technical solution adopted by the present invention is the side that a kind of 10KV distribution overhead lines are taken shelter from the thunder
Method, including following effective procedure：
A, the information of 10KV distribution overhead lines is collected first, and the information of the distribution line includes the height of shaft tower, bar
The distance of tower, the height of lightning conducter, the installation site of arrester and circuit dielectric level；
B, according to collecting come the information of 10KV distribution overhead lines, relevant model and structure are established using PSCAD and EMTDC
Make the circuit of 7 base shaft towers；
C, the flashover number of both sides circuit is calculated, calculation formula is：
Wherein, NiIt is calculated every year according to 24 thunderstorm days for 100km circuits, the flashover number of circuit is caused by lightning stroke, P is
Annual thunderstorm day is more than 20 days regional lightning current distribution probabilities, and hd is conducting wire away from ground level, and γ is according to DL/T620-
The lightning strike density of 1997 values, S are the distance of lightning strike spot and circuit, and d is the distance of lightning strike spot and shaft tower central point；
D, to calculate influence and line insulation level of the shaft tower height to tripping rate with lightning strike according to the flashover number of circuit right
Tripping rate with lightning strike, and then choose the shaft tower and insulator of proper height；
Wherein, in the step c,Wherein,Wherein, when Imin is flickered for circuit
Minimum flicker electric current；Arrester is set up on the circuit of Ni≤8, the ground resistance of shaft tower is controlled to be less than 30 ' Ω, in Ni≤8
Lightning conducter is set up on circuit, the height apart from head of mast of the lightning conducter is 0.3m.
Compared with prior art, the advantages and positive effects of the present invention are,
1st, the present invention provides a kind of method that 10KV distribution overhead lines are taken shelter from the thunder, be effectively combined lightning strike spot, flicker electric current,
The factors such as the height of conducting wire with reference to the formula of optimization, provide a kind of optimization method, with most to the erection of 10KV distribution overhead lines
Low cost is optimal the purpose of lightning-arrest effect, and this method is easy to operate, is that those skilled in the art are all operable, is suitble to big rule
Mould is promoted the use of.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to embodiment to this hair
It is bright to be described further.It should be noted that in the absence of conflict, the feature in embodiments herein and embodiment can
To be combined with each other.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
With using implementing different from other modes described here, therefore, the present invention is not limited to the specific of specification is described below
The limitation of embodiment.
Embodiment 1, the present embodiment provides a kind of method that 10KV distribution overhead lines are taken shelter from the thunder, specifically using Donga County as
Example, the annual thunderstorm day of Donga County is 24 days, and the Donga County electric company service small towns of Donga County 10,1 provincial economy are opened
Area, 507 administrative villages, 130,000 clients are sent out, by the end of the year 2015, Donga possesses 220 kv substation 2,110 kilovolts of changes within the border
9, power station, 35 kv substations 16；Possess 35 kilovolts and 265.84 km of above power transmission and transformation line, 10 KV line
906.04 kms, 0.4 KV line, 956.64 km.
In the present embodiment, by taking the line of Donga County Dongcheng city as an example, Dongcheng line use LJ-70 conducting wires, safety coefficient K=
2.5, overall length 5.06km, institute are plains region through section, and totally 48 base shafts, are Pre-stressed pole, wherein, angle pole and tension-resistant rod
Totally 3 base, in addition to 1 bar is using 15m bars, using 12m bars, span is larger for other, completely common completely using S-210/Z porcelain pole arms
Zinc-Oxide Arrester 6 is installed, all fronts conducting wire is by the way of rounded projections arranged.
According to the data collected, one 7 base shaft tower of relevant model and construction are established using PSCAD and EMTDC
Circuit, PSCAD are responsible for interface figure, and EMTDC is responsible for simulation and calculates, and PSCAD and EMTDC have been applied 30 years in power industry
, therefore, in the present embodiment, it is not added with detailed description.
In model calculating process, the height of conducting wire is 11m, and the parameters such as the inductance and capacitance of conducting wire take high frequency 106HZ
When parameter, the electrical parameter of conducting wire calculated using existing route parameter calculation program, and pole tower ground resistance is taken as 30 '
Ω, shaft tower inductance are taken as 0.84 μ H/m.Since circuit whole process uses S-210/Z porcelain pole arms, when lightning induced voltage Ug surpasses
50% discharge voltage of line insulator is crossed, flashover will occur for insulator, with reference to electromagnetic field method, the minimum flashover current for calculating to be struck by lightning
Relationship between the horizontal distance of circuit isDue to S2≧hd2, therefore formula also may be used
To be reduced to Imin=α .S, whereinThe amplitude of lightning current used at present in general area according to China is more than I
Probability curve, selected empirical equation lgp=-I/88 derivesP is more than for annual thunderstorm day
20 days regional lightning current distribution probabilities, according to formulaWherein, NiFor 100km circuits
(24 thunderstorm days) causes line flashover number due to being struck by lightning every year, and P is more than 20 days regional lightning currents for annual thunderstorm day
Distribution probability, hd are conducting wire away from ground level, and γ is lightning strike density (according to DL/T620-1997 values), in the present embodiment,
γ values are the distance that 0.07, S is lightning strike spot and circuit, and d is the distance of lightning strike spot and shaft tower central point, by final formula
Derivation can be calculated,
With a height of 15 meters of bar, for conducting wire to the average distance hd=11m on ground, N is calculated in α=0.76i=9.5, with bar
A height of 12 meters, for conducting wire to the average distance hd=9.5m on ground, N is calculated in α=0.88i=8.1, at 15 meters high compared with bar, thunder
Trip-out rate low 14% is hit, with a height of 10 meters of bar, to the average distance hd=7.8m on ground, α=1.07 of calculation calculate conducting wire
Go out Ni=6.8, at 15 meters high compared to bar, tripping rate with lightning strike low 28% is to sum up calculated it is found that Donga County 10KV power grids are maked somebody a mere figurehead
Highly preferred 10 meters of shaft tower, and under this height, arrester and lightning conducter can not be set.
Due in the present embodiment, S-210/Z porcelain pole arms that insulator is selected, when insulator selects S-280/Z porcelain pole arms
When, flashover number is calculated,
With a height of 15 meters of bar, conducting wire calculates α=280/25hd=1.01, calculates to the average distance hd=11m on ground
Go out Ni=7.1, with a height of 12 meters of bar, conducting wire calculates α=280/25hd=1.17, meter to the average distance hd=9.5m on ground
Calculate Ni=6.1, tripping rate with lightning strike low 14%.
It to sum up calculates it is found that in Donga County electric company 10KV overhead transmission lines, the preferred 10m electric poles of shaft tower, insulator is preferred
S-280/Z porcelain pole arms, in this case, 100km lightning strokes cause line flashover number to reach minimum, the reduction of flashover number is also
Mean the best of lightning-arrest effect.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed and be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
It imitates embodiment and is applied to other fields, but it is every without departing from technical solution of the present invention content, technical spirit according to the present invention
To any simple modification, equivalent variations and remodeling that above example is made, the protection domain of technical solution of the present invention is still fallen within.
Claims (1)
1. a kind of method that 10KV distribution overhead lines are taken shelter from the thunder, which is characterized in that including following effective procedure：
A, the information of 10KV distribution overhead lines is collected first, the information of the distribution line includes the height of shaft tower, shaft tower
The dielectric level of distance, the height of lightning conducter, the installation site of arrester and circuit；
B, according to collecting come the information of 10KV distribution overhead lines, relevant model and construction one are established using PSCAD and EMTDC
The circuit of 7 base shaft tower of item；
C, the flashover number of both sides circuit is calculated, calculation formula is：
Wherein, NiIt is calculated every year according to 24 thunderstorm days for 100km circuits, the flashover number of circuit is caused by lightning stroke, P is put down for year
Equal thunderstorm day is more than 20 days regional lightning current distribution probabilities, and hd is conducting wire away from ground level, and γ is according to DL/T620-1997
The lightning strike density of value, S are the distance of lightning strike spot and circuit, and d is the distance of lightning strike spot and shaft tower central point；
D, influence and line insulation level of the shaft tower height to tripping rate with lightning strike are calculated to lightning stroke according to the flashover number of circuit
Trip-out rate, and then choose the shaft tower and insulator of proper height；
Wherein, in the step c,Wherein, α=Imin/ S, wherein, minimum sudden strain of a muscle when Imin is flickered for circuit
Bright electric current；Arrester is set up on the circuit of Ni≤8, the ground resistance of shaft tower is controlled to be less than 30 ＇ Ω, on the circuit of Ni≤8
Lightning conducter is set up, the height apart from head of mast of the lightning conducter is 0.3m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610983328.9A CN106451307B (en) | 2016-11-09 | 2016-11-09 | The method that 10KV distribution overhead lines are taken shelter from the thunder |
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| CN201610983328.9A CN106451307B (en) | 2016-11-09 | 2016-11-09 | The method that 10KV distribution overhead lines are taken shelter from the thunder |
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| CN106451307A CN106451307A (en) | 2017-02-22 |
| CN106451307B true CN106451307B (en) | 2018-06-22 |
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| CN107832969B (en) * | 2017-11-24 | 2021-09-21 | 广东电网有限责任公司清远供电局 | Economic analysis method for 10kV distribution line overhead line erection |
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| CN103001153B (en) * | 2012-12-20 | 2016-06-01 | 诸暨市供电局 | A kind of distribution network lightning protection method of economical rationality |
| CN103887756A (en) * | 2014-03-14 | 2014-06-25 | 国家电网公司 | Electric transmission line straight line angle tower lightning protection measure collocation method |
| CN105244836A (en) * | 2015-11-16 | 2016-01-13 | 国网山东寿光市供电公司 | Differentiation lightning protection method of urban area 10KV distribution line |
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Inventor after: Wang Shanliang Inventor after: Huang Jian Inventor after: Ding Wenbin Inventor after: An Haitao Inventor after: Wang Dong Inventor after: Zhao Peng Inventor after: Song Junshan Inventor after: Zhu Aidong Inventor before: Wang Shanliang Inventor before: Zhu Aidong Inventor before: Wang Dong Inventor before: Wang Zongbo Inventor before: Si Daofeng Inventor before: Liu Xiaofeng Inventor before: Song Junshan Inventor before: Shao Hongling Inventor before: Qin Bin Inventor before: Xiao Gang Inventor before: Liu Minghu |
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