CN101122623A - High voltage electricity transmission system thunder-proof property parameter test method - Google Patents

High voltage electricity transmission system thunder-proof property parameter test method Download PDF

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Publication number
CN101122623A
CN101122623A CNA200710121781XA CN200710121781A CN101122623A CN 101122623 A CN101122623 A CN 101122623A CN A200710121781X A CNA200710121781X A CN A200710121781XA CN 200710121781 A CN200710121781 A CN 200710121781A CN 101122623 A CN101122623 A CN 101122623A
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China
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lightning
thunder
thunderbolt
discharge channel
electric
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CNA200710121781XA
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Chinese (zh)
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CN100498357C (en
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陈水明
何金良
徐伟
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清华大学
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Abstract

The invention relates to a testing method of anti-lightening performance parameters of high-voltage transmission system, pertaining to the anti-lightning technology in the art of electricians. First is to calculate the development probability Pi in i direction of a discharge channel each time, repeat the calculation, a lightning pilot develops forward to get the discharge channel; the second is to respectively calculate the number of lightning attacks on wire, lightning conductor and iron tower; at last, according to the number of lightning attack wires/total number of lightning attacks and the number of lightning attack iron towers/total number of lightning attacks, the attack rate and the counterattack rate are got. The calculation shows that calculating the transmission line by the invention, particularly the attack rate of super and ultra-high voltage lines is much closer to the actual operational result compared with the traditional rule method and electrical geometric model.

Description

Method of testing to anti-lightening performance parameters
Technical field
The present invention relates to a kind of method of testing, relate in particular to the lightning protection properties test of super, UHV transmission line and transformer station, belong to the electrical field shocking preventing technology anti-lightening performance parameters.
Background technology
Thunder and lightning is the recurrent a kind of atmospheric discharge phenomenon of nature.It causes significant impact to the operation of electric system.When stronger thunder and lightning transmission line of lightning strike, cause power outage thereby tripping operation generally can take place circuit.Along with the raising of voltage class of electric power system, the height of transmission line of electricity is more and more higher, thus the accident of easy more generation transmission line of lightning strike lead, and this claims thunderbolt in electric system.Transmission line of lightning strike divides counterattack and two kinds of situations of shielding, when be struck by lightning lightning conducter and iron tower cause line tripping, claims counterattack; When the thunderbolt lead causes tripping operation, claim shielding.Generally speaking, shielding is than the easier line tripping that causes of counterattack.Therefore, when line design, wish that generally risk of shielding failure (the shielding number of times/number of times always is struck by lightning) is low, can reduce tripping rate with lightning strike like this.
Corresponding counterattack and shielding have two parameters of describing the line thunder protection performance, claim counterattack trip-out rate and shielding trip-out rate.The general tripping rate with lightning strike that adopts rules method and electric geometric model to test transmission line of electricity.More or less there are some problems in these methods when being applied to the practical problems analysis, the actual risk of shielding failure of transmission line of electricity is higher than said method, and therefore existing theory can not be explained the shielding problem of transmission line of electricity.After particularly UHV (ultra-high voltage), extra high voltage line occurred in recent years, along with the raising of electric pressure, electric power line pole tower was more and more higher, and shaft tower is high more, the easy more generation shielding of circuit.Two kinds of traditional methods can't be explained the higher problem of the actual risk of shielding failure of super, extra high voltage line especially.
Summary of the invention
The objective of the invention is method of testing, describe the lightning stroke process of thunder and lightning, manifest the distortion and the multiple-limb phenomenon of nature thunder discharge passage, to test relevant lightning protection properties parameter with existing fractal theory to anti-lightening performance parameters.
The method of testing to anti-lightening performance parameters that the present invention proposes may further comprise the steps:
(1) calculates the development probability P of each discharge channel to the i direction i: P i = ( E i ) η Σ n ( E i ) η
Wherein, E iBe the electric field intensity of i direction, adopt method of finite difference (Finite Difference Method) by finding the solution the current potential Laplce  of band edge circle condition 2=0 equation obtains, and η is the factor of influence of ambient atmosphere electric field to the thunder and lightning path, between 0-5;
(2) repeating step (1), thunder and lightning the guide advance, and obtains discharge channel;
(3) calculate the number of times that thunder and lightning hits lead, lightning conducter and iron tower respectively;
(4) according to the thunderbolt lead number of times/number of times that always is struck by lightning, obtain risk of shielding failure;
(5) according to the thunderbolt iron tower number of times/number of times that always is struck by lightning, obtain risk of flashback.
The method of testing to anti-lightening performance parameters that the present invention proposes, its advantage is to describe the lightning stroke process of thunder and lightning with fractal theory, more meets the actual conditions of thunderbolt.By changing the parameter in fractal, change the shape and the degreeof tortuosity of thunderbolt passage, the thunderbolt point when determining the thunderbolt circuit, thus obtain the thunderbolt rate of transmission line of electricity.Calculating shows, adopts method computing electric power line of the present invention, and the risk of shielding failure of particularly super, extra high voltage line more approaches The actual running results than traditional rules method and electric geometric model.
Description of drawings
Fig. 1 is the transmission line of electricity synoptic diagram.
Fig. 2 is the constitutional diagram of thunder and lightning guide during near ground.
Embodiment
The method of testing to anti-lightening performance parameters that the present invention proposes may further comprise the steps:
(1) calculates the development probability P of each discharge channel to the i direction i: P i = ( E i ) η Σ n ( E i ) η
Wherein, E iBe the electric field intensity of i direction, adopt method of finite difference (Finite Difference Method) by finding the solution the current potential Laplce  of band edge circle condition 2=0 equation obtains, and η is the factor of influence of ambient atmosphere electric field to the thunder and lightning path, between 0-5;
(2) repeating step (1), thunder and lightning the guide advance, and obtains discharge channel;
(3) calculate the number of times that thunder and lightning hits lead, lightning conducter and iron tower respectively;
(4) according to the thunderbolt lead number of times/number of times that always is struck by lightning, obtain risk of shielding failure;
(5) according to the thunderbolt iron tower number of times/number of times that always is struck by lightning, obtain risk of flashback.
The present invention introduces the simulation of thunder discharge with fractal theory, has shown the distortion and the bifurcation of thunder discharge passage better.By changing fractal coefficient, the thunder discharge phenomenon of different torsion resistances and different branches can be described.
On this basis, use this method in the Analysis of Lightning Stroke of actual transmission line of electricity.
The principle of the inventive method is as follows: describe the passage of thunder discharge with fractal theory, the developing direction of each discharge is determined by following formula:
P i = ( E i ) η Σ n ( E i ) η - - - ( 1 )
In the formula, P iBe the development probability of discharge channel to the i direction, E iBe the electric field intensity of i direction, by finding the solution current potential Laplce (Laplace)  of band edge circle condition 2=0 equation obtains, and η is the factor of influence of ambient atmosphere electric field to the thunder and lightning path, between 0-5.
By changing factor of influence in the fractal expression formula (change the factor and characterize ambient atmosphere electric field that thundercloud causes influence degree) to the thunder and lightning path, can change the torsion resistance and the bifurcated situation of thunder discharge passage, can be according to the observation during actual value and the fractal dimension that calculates the actual discharge photo determine.Situation with this method research transmission line of lightning strike, thinking is: according to boundary condition, current potential as thundercloud, (Finite Difference Method) finds the solution the Laplace equation with method of finite difference, obtain the electric field intensity of all directions, determine discharge guide developing direction according to formula (1) then, like this, advance step by step, obtain discharge channel shown in Figure 2.When the thunder and lightning passage is overhead higher, ground situation does not influence the development of thunder and lightning passage, and when thunder and lightning guide head closely during face, the object of differing heights, different ground connection situations will influence thunder and lightning guide's developing direction on the ground, when the electric field on the ground between certain object and the guide's head reaches the atmosphere breakdown field strength, the incident of this object of being struck by lightning this moment has just taken place, thereby the ground lightning strike spot of current thunderbolt has also just been determined.Said process is applied to transmission line of electricity, and the lightning stroke process of particularly super, UHV transmission line just can be determined to be struck by lightning in iron tower, ground, still is struck by lightning in lead, lightning conducter.By hundreds of times calculating, the size of risk of shielding failure in the time of just can analyzing this circuit of thunderbolt, thus can improve the iron tower shape, thus risk of shielding failure reduced.
The inventive method adopts the discharge process of fractal theory simulation thunder and lightning, and this method be applied to surpass, performance parameters such as the risk of shielding failure of extra high voltage line and shielding trip-out rate calculate; By changing the complicacy that some factors in fractal change the thunder discharge passages.Adopt the inventive method can test the lightning protection effect of different transmission lines of electricity, the gained result more approaches The actual running results than traditional rules method and electric geometric model.
As an example, the present invention is that the iron tower of h=30m calculates to height shown in Figure 1, supposes thundercloud height H=300m.Fig. 2 is the situation of thunder and lightning guide during near ground.The result is as follows: simulated 100 thunderbolts altogether, the thunderbolt iron tower is wherein arranged 25 times, 65 thunderbolt lightning conducters, 10 thunderbolt leads, thereby obtain this circuit shielding incidence=thunderbolt lead number of times/number of times=10/100=10% always is struck by lightning, by calculating, just can obtain the shielding trip-out rate of this circuit to whole circuit thunderbolt number of times.

Claims (1)

1. method of testing to anti-lightening performance parameters is characterized in that method may further comprise the steps:
(1) calculates the development probability P of each discharge channel to the i direction i: P i = ( E i ) η Σ n ( E i ) η
Wherein, E iBe the electric field intensity of i direction, adopt method of finite difference (Finite Difference Method) by finding the solution the current potential Laplce  of band edge circle condition 2=0 equation obtains, and η is the factor of influence of ambient atmosphere electric field to the thunder and lightning path, between 0-5;
(2) repeating step (1), thunder and lightning the guide advance, and obtains discharge channel;
(3) calculate the number of times that thunder and lightning hits lead, lightning conducter and iron tower respectively;
(4) according to the thunderbolt lead number of times/number of times that always is struck by lightning, obtain risk of shielding failure;
(5) according to the thunderbolt iron tower number of times/number of times that always is struck by lightning, obtain risk of flashback.
CNB200710121781XA 2007-09-14 2007-09-14 High voltage electricity transmission system thunder-proof property parameter test method CN100498357C (en)

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CN100498357C CN100498357C (en) 2009-06-10

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101290336B (en) * 2008-06-18 2010-06-02 昆明理工大学 Alternating-current powerline thunderbolt shielding failure and counterattack recognition method
CN102637219A (en) * 2012-03-02 2012-08-15 清华大学 Lightning fractal method based on charge simulation method and finite difference method in power system
CN103809076A (en) * 2012-11-09 2014-05-21 国家电网公司 Power transmission line fault processing method and device
CN104897977A (en) * 2014-03-07 2015-09-09 武汉三相电力科技有限公司 Power transmission line lightning stroke frequency direct monitoring method
CN106680632A (en) * 2016-12-30 2017-05-17 杭州后博科技有限公司 Iron tower lightning protection performance detection method based on electromagnetic radiation abnormity determination and system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2336493Y (en) * 1998-02-10 1999-09-01 江西省电力通信公司 Lightning protection device for transmission lines
CN2404248Y (en) * 1999-12-16 2000-11-01 成都星河科技产业有限公司 Special lightning-protection & arc extinguishing device for high-voltage transmission line
CN100361123C (en) * 2005-10-28 2008-01-09 清华大学 Whole line and multi-parameter integrated optimizing method for determining lightningproof performance of power transmission line
CN100468072C (en) * 2006-07-14 2009-03-11 华北电力大学 High-voltage transmission line lightning stroke flashover path detection method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101290336B (en) * 2008-06-18 2010-06-02 昆明理工大学 Alternating-current powerline thunderbolt shielding failure and counterattack recognition method
CN102637219A (en) * 2012-03-02 2012-08-15 清华大学 Lightning fractal method based on charge simulation method and finite difference method in power system
CN103809076A (en) * 2012-11-09 2014-05-21 国家电网公司 Power transmission line fault processing method and device
CN103809076B (en) * 2012-11-09 2017-03-15 国家电网公司 Transmission line malfunction processing method and processing device
CN104897977A (en) * 2014-03-07 2015-09-09 武汉三相电力科技有限公司 Power transmission line lightning stroke frequency direct monitoring method
CN104897977B (en) * 2014-03-07 2018-02-02 武汉三相电力科技有限公司 A kind of direct monitoring method of transmission line lightning stroke frequency
CN106680632A (en) * 2016-12-30 2017-05-17 杭州后博科技有限公司 Iron tower lightning protection performance detection method based on electromagnetic radiation abnormity determination and system
CN106680632B (en) * 2016-12-30 2021-01-08 杭州后博科技有限公司 Iron tower lightning protection performance detection method and system based on electromagnetic radiation abnormity judgment

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