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 PDFInfo
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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
Technical Field
The invention relates to a method for testing lightning protection performance parameters of a high-voltage transmission system, in particular to a lightning protection performance test of an ultra-high voltage transmission line and a transformer substation, belonging to the field of lightning protection technology in electricians.
Background
Lightning is an atmospheric discharge phenomenon that often occurs in nature. It has a significant impact on the operation of the power system. When strong lightning strikes a transmission line, the line generally trips to cause a power failure accident. With the increase of the voltage class of the power system, the height of the power transmission line is higher and higher, so that the accident of lightning striking the wire of the power transmission line is more likely to occur, which is called lightning striking in the power system. The lightning stroke of the transmission line is divided into counterattack and shielding attack, and when the lightning stroke of the lightning conductor and the iron tower causes line tripping, the counterattack is called; when a lightning strikes a wire to cause a trip, it is called a strike. In general, a wire trip is more likely to be caused by a wire strike than by a counterstrike. Therefore, in the line design, it is generally desirable that the shielding failure rate (shielding failure times/total lightning stroke times) is lower, which can reduce the lightning stroke trip rate.
Corresponding to counterattack and shielding failure, two parameters for describing the lightning protection performance of the line are called counterattack trip rate and shielding failure trip rate. 1. The lightning trip-out rate of the transmission line is tested by adopting a rule method and an electrical geometric model. When the methods are applied to the analysis of practical problems, problems exist more or less, and the practical shielding failure rate of the power transmission line is higher than that of the methods, so that the existing theory cannot explain the shielding failure problem of the power transmission line. Particularly, after ultrahigh voltage and extra-high voltage lines appear in recent years, the towers of the transmission lines are higher and higher along with the improvement of voltage grade, and the higher the towers are, the more easily the lines are subjected to shielding failure. The two traditional methods can not explain the problem of high actual shielding failure rate of ultra-high and extra-high voltage lines.
Disclosure of Invention
The invention aims to provide a method for testing lightning protection performance parameters of a high-voltage power transmission system, which describes the lightning stroke process of lightning by using the existing fractal theory, shows the distortion and multi-branch phenomena of a natural lightning discharge channel and tests related lightning protection performance parameters.
The invention provides a method for testing lightning protection performance parameters of a high-voltage power transmission system, which comprises the following steps:
(1) Calculating the development probability P of each discharge channel to the i direction i ：
Wherein E is i For the electric field intensity in the i direction, a finite difference method (FiniteDifference method) is usedDetermining Laplacian ® potential for solving band boundary conditions 2 =0 equation, η is the influence factor of the surrounding atmosphere electric field on the lightning path, and is between 0 and 5;
(2) Repeating the step (1), and developing the lightning guide forward to obtain a discharge channel;
(3) Respectively calculating the times of lightning striking the conducting wire, the lightning conductor and the iron tower;
(4) According to the lightning stroke conducting wire times/total lightning stroke times, the shielding failure rate is obtained;
(5) And obtaining the counterattack rate according to the times of lightning striking the iron tower/the total lightning striking times.
The method for testing the lightning protection performance parameters of the high-voltage power transmission system has the advantages that the fractal theory is used for describing the lightning stroke process of lightning, and the actual condition of the lightning stroke is better met. And by changing parameters in the fractal, the shape and the distortion degree of a lightning stroke channel are changed, and a lightning strike point when a line is struck by lightning is determined, so that the lightning shielding failure rate of the power transmission line is obtained. The calculation shows that the method for calculating the shielding failure rate of the transmission line, particularly the extra-high voltage line and the extra-high voltage line is closer to the actual operation result than the traditional rule method and the electrical geometric model.
Drawings
Fig. 1 is a schematic diagram of a power transmission line.
Fig. 2 is a state diagram when the lightning leader is close to the ground.
Detailed Description
The invention provides a method for testing lightning protection performance parameters of a high-voltage power transmission system, which comprises the following steps:
(1) Calculating the development probability P of each discharge channel to the i direction i ：
Wherein E is i For the field strength in the i direction, finite difference method (FiniteDifference method) is used to solve the bandsPotential laplace ∑ of boundary conditions 2 =0 equation, η is the influence factor of the surrounding atmosphere electric field on the lightning path, and is between 0 and 5;
(2) Repeating the step (1), and developing the lightning guide forward to obtain a discharge channel;
(3) Respectively calculating the times of lightning striking the conducting wire, the lightning conductor and the iron tower;
(4) According to the lightning stroke conducting wire times/total lightning stroke times, the shielding failure rate is obtained;
(5) And obtaining the counterattack rate according to the times of lightning striking the iron tower/the total lightning striking times.
The invention introduces fractal theory into the simulation of lightning discharge, and better displays the distortion and bifurcation phenomena of a lightning discharge channel. By changing the fractal coefficient, the lightning discharge phenomena of different torsion degrees and different branches can be described.
On the basis, the method is applied to lightning stroke analysis of the actual power transmission line.
The principle of the method of the invention is as follows: the channel of lightning discharge is described by a fractal theory, and the development direction of each discharge is determined by the following expression:
in the formula, P i For the probability of development of the discharge channel in the direction i, E i For the electric field strength in the i direction, by solving for the potential Laplace (Laplace) · v with boundary conditions 2 =0 equation, η is the influence factor of the surrounding atmosphere electric field on the lightning path, and is between 0 and 5.
By changing the influence factor in the fractal expression (the change factor represents the influence degree of the surrounding atmospheric electric field caused by thundercloud on the lightning path), the torsion resistance and the bifurcation condition of the lightning discharge channel can be changed, and the actual value taking can be determined according to the observation and calculation of the fractal dimension of the actual discharge photo. The method is used for researching the condition of lightning striking the transmission line, and the thought is as follows: according to boundary conditions, such as the potential of thunderclouds, a Finite Difference Method is used for solving a Laplace equation to obtain the electric field intensity in each direction, then the development direction of the discharge leader is determined according to a formula (1), and thus, the discharge channel shown in FIG. 2 is obtained by one-step forward development. When the lightning channel is higher than the ground, the development of the lightning channel is not influenced by the ground condition, and when the head of the lightning guide is close to the ground, objects with different heights and different grounding conditions on the ground influence the development direction of the lightning guide, and when the electric field between a certain object on the ground and the head of the guide reaches the atmospheric breakdown field intensity, the event of lightning striking the object occurs at the moment, so that the ground lightning strike point of the lightning strike is determined. The process is applied to the lightning stroke process of the transmission line, particularly the ultra-high voltage and ultra-high voltage transmission lines, so that whether the iron tower and the ground are struck by lightning or the conducting wire and the lightning conductor are struck by lightning can be determined. By hundreds of times of calculation, the size of the shielding failure rate when the line is struck by lightning can be analyzed, so that the shape of the iron tower can be improved, and the shielding failure rate is reduced.
The method adopts a fractal theory to simulate the discharge process of lightning, and is applied to the calculation of performance parameters such as the shielding failure rate, the shielding failure trip-out rate and the like of the extra-high voltage and extra-high voltage lines; the complexity of the lightning discharge path is changed by changing some factor in the fractal. The method can test the lightning protection effect of different power transmission lines, and the obtained result is closer to the actual operation result than the traditional rule method and the electrical geometric model.
As an example, the present invention calculates the tower height H =30m shown in fig. 1, assuming that the height H =300m of thundercloud. Fig. 2 shows the situation when the lightning leader is close to the ground. The results are as follows: the total 100 lightning strokes are simulated, wherein 25 lightning strokes are performed on an iron tower, 65 lightning strokes are performed on a lightning conductor and 10 lightning strokes are performed on a conductor, so that the shielding failure occurrence rate of the line = lightning stroke conductor times/total lightning stroke times =10/100=10%, and the shielding failure trip rate of the line can be obtained by calculating the lightning stroke times of the whole line.
Claims (1)
1. A method for testing lightning protection performance parameters of a high-voltage power transmission system is characterized by comprising the following steps:
(1) Calculating the development probability P of each discharge channel to the i direction i ：
Wherein, E i For the electric field intensity in the i direction, a finite difference method (FiniteDifference method) is adopted to solve the potential Laplacian v with boundary conditions 2 =0 equation, eta is the influence factor of the surrounding atmosphere electric field on the lightning path and is between 0 and 5;
(2) Repeating the step (1), and developing the lightning guide forward to obtain a discharge channel;
(3) Respectively calculating the times of lightning striking the conducting wire, the lightning conductor and the iron tower;
(4) According to the lightning stroke conducting wire times/total lightning stroke times, the shielding failure rate is obtained;
(5) And obtaining the counterattack rate according to the times of lightning striking the iron tower/the total lightning striking times.
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| CNB200710121781XA CN100498357C (en) | 2007-09-14 | 2007-09-14 | High voltage electricity transmission system thunder-proof property parameter test method |
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Cited By (5)
| 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)
| 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 |
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2007
- 2007-09-14 CN CNB200710121781XA patent/CN100498357C/en not_active Expired - Fee Related
Cited By (8)
| 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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