Electric transmission line three-dimensional lightning calculating method based on electric transmission line structure and terrain
A technology of transmission lines and calculation methods, applied in the fields of electromagnetic field characteristics, fault locations, etc., can solve problems such as the large discrepancy between evaluation and operation results, and the lack of a lightning development model
Active Publication Date: 2014-03-12
TSINGHUA UNIV
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Problems solved by technology
The leader development model simply models the initial conditions of lightning downlink leader and uplink leader, but does not propose a complete and achievable lightning development model
[0006] No matter which method is used, the traditional lightning strike analysis method for transmission lines does not investigate the influence of local terrain in depth, and only distinguishes between mountainous areas and plains, which often leads to large discrepancies between evaluation and operation results; traditional lightning strike analysis methods for transmission lines do not consider the structure and terrain of transmission lines Detailed 3D modeling analysis of the lightning strike process of the transmission line under the influence
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[0067] The three-dimensional lightning strike calculation method of the transmission line based on the structure of the transmission line and the terrain proposed by the present invention comprises the following steps:
[0068] (1) Determine a horizontal square area as the calculation range of lightning strikes on the ground below the transmission line. The center of the horizontal square area is O' and the side length is D. Establish a three-dimensional rectangular coordinate system (X, Y, Z), and the three-dimensional rectangular coordinates The origin of the coordinate system is O, the X-axis is due east, the Y-axis is due south, and the Z-axis is vertical to the horizontal plane. The origin O of the coordinate system is located on the horizontal plane where the lowest point within the calculation range of the above-mentioned ground lightning strike is located, and O′O Vertical to the horizontal plane; divide the terrain surface of the above-mentioned ground lightning strike...
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The invention relates to an electric transmission line three-dimensional lightning calculating method based on an electric transmission line structure and a terrain, which belongs to the field of electric transmission line lightning protection. The method comprises the following steps of: modeling a lightning process by using the current relatively mature parameters; comprehensively considering the influences of factors such as an electric transmission line structure, an electric transmission line running voltage, a terrain, thundercloud charge and the like on a thunder developing process; and simulating the development of downward leading and upward leading of lightning to obtain a lightning striking position. The lightning striking process calculated by using the method is more accordant with the practical lightning situation, so that the accuracy of lightning trip-out analysis in practical engineering is increased when the method is used for calculating the lightning trip-out rate of practical engineering; and the method disclosed can be used for calculating the lightning process of the electric transmission line on various terrains, and the calculation application range is wide.
Description
technical field [0001] The invention relates to a three-dimensional lightning strike calculation method for a transmission line based on the structure and topography of the transmission line, belonging to the field of lightning protection for the transmission line. Background technique [0002] The lightning shielding analysis methods of transmission lines mainly include the procedure method, the electrical geometric model, and the leading development model. [0003] Scholars from various countries have summed up the empirical formula of shielding rate based on actual operation experience and simulation test results, and believe that the shielding rate is related to the protection angle of the ground line, the height of the tower, and the topographical conditions along the transmission line. The regulation method does not consider the development process of lightning, and its physical meaning is not clear; the regulation method does not consider the influence of the lightnin...
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Inventor 曾嵘李谦余占清何金良袁骏李志钊庄池杰廖永力沈晓丽
Owner TSINGHUA UNIV