Estimation method of ground lightning density near the catenary system of high-speed railway viaduct

Abstract

The invention discloses a method for estimating lightning density on the ground near a catenary system of a high-speed railway viaduct. First, a system research space is determined. On the basis of the finite difference method and the super-relaxation iteration method to calculate the space electric field, combined with the lightning fractal theory, a high-speed railway is established. The lightning fractal development model of the catenary system of the viaduct; the model established by multiple simulations, the number of lightning strikes and their corresponding coordinates on the ground near the high-speed railway viaduct are obtained. The functional relationship between the fitting coefficient and the height of the viaduct is obtained, and finally the functional expression of the density of lightning on the ground near the viaduct and the ground coordinates and the height of the viaduct is obtained. The estimation method proposed by the invention can estimate the lightning density on the ground near the high-speed railway catenary system under the lightning environment, and has certain guiding significance for the placement of important equipment near the viaduct to reduce the probability of being struck by lightning.

Description

technical field [0001] The invention relates to the technical field of power system overvoltage, in particular to a method for estimating lightning density on the ground near a catenary system of a high-speed railway viaduct. Background technique [0002] After the construction of the higher viaduct catenary system, because it is much higher than the ground and has a large size, it can affect the electric field distribution around the high-speed railway within a certain range, and has strong lightning characteristics, which may cause damage to the distribution of ground lightning. To a certain extent, the distribution of ground lightning directly determines the probability of ground buildings and equipment being struck by lightning, and even threatens personal safety. Therefore, it is of great theoretical significance and engineering value to study the impact of viaduct catenary system on the distribution of ground lightning. [0003] At present, the research on lightning st...

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Problems solved by technology

In terms of high-speed railways, although many domestic scholars have conducted a lot of research on its lightning characteristics, among them, the high-voltage technology "Lightning Protection System for High-speed Railway Traction Power Supply System" in the 39th issue of 2013 and the high-voltage technology in the 41st issue of 2015 "Comprehensive Evaluation of Lightning Protection Effects of Elevating PW Lines or Erection of Lightning Arrester Lines" is based on the particularity of the catenary system to study its lightning protection characteristics, and puts forward certain protection measures, such as elevating the PW line and serving as a lightning arrester line or separately The lightning protection scheme of erecting lightning protection lines, but none of the above studies involve the ground lightning near the building, but based on the above research results, it can be known that the tall buildings on the ground will change the lightning strike path, which will affect the distribution of ground lightning near the building to a certain extent

[0004] In addition, the above research applied two lightning strike models: Electrical Geometric Model (EGM) and Pioneer Propagation Model (LPM). The propagation model only considers the certainty of lightning development, but does not consider the randomness of lightning development

The 36th issue of high voltage technology in 2010, "Transmission Line Lightning Protection Analysis Fractal Model and Its Statistical Characteristics", although it involves the impact of transmission line erection on the distribution of ground lightning, but the transmission line and catenary system regardless of voltage level, line erection height, Conductor types, system structures, materials, etc. are all very different. At the same time, the above research uses statistical methods and pilot development models, and fails to give the specific characteristics of the ground lightning distribution before and after erection.

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