Lightning Protection Design for Small Riverboats Using the FDTD Method

Leal, Adonis F. R.; Oliveira, Rodrigo M. S. de; Lopes, N.; Lima, Thiago; Ferreira, Ederlan de Souza; Rodrigues, Nilton R. N. M.

doi:10.1590/2179-10742021v20i21074

J. Microw. Optoelectron. Electromagn. Appl.

2021

DOI: 10.1590/2179-10742021v20i21074

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Lightning Protection Design for Small Riverboats Using the FDTD Method

Adonis F. R. Leal

Rodrigo M. S. de Oliveira

N. Lopes

et al.

Abstract: The Amazon region has high lightning occurrence rates, with many lightning hot spots. Different rivers cross the Amazon rainforests and the people that live there use these rivers as roads to go from one place to another. Every year, lightning deaths are reported in the Brazilian Amazon region. In 2018, a lightning discharge struck a small riverboat, which killed 4 people and injured 5 in the North region of Brazil. In this study, we investigate lightning fatalities in Amazon rivers and compute electric field … Show more

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2023

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“…Which definitely affect the location of the lightning strike, but also have a stochastic nature. Attempts to take into account opposing leaders are presented in [12,13]. The obtained results have a certain value for the development of methods, but have not yet been reflected in standards.…”

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Determination of the probability of a lightning strike in the elements of the object taking into account the statistical distribution of the current value

Kniaziev

2023

Electrical Engineering & Electromechanics

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Problem. Modern international standards in the field of lightning protection, when assessing the probability of a lightning strike into an object, do not take into account the statistical distribution of the lightning current. Goal. Justification of the expediency of taking into account the statistical distribution of the lightning current with a determined probability of lightning striking the elements of the object, and the effectiveness of the application of the improved «rolling sphere» method. Methodology. Method of mathematical modeling, based on RSM with additional consideration of the probability distribution of lightning current. Results. The expediency of taking into account the statistical distribution of lightning current at the determined probability of lightning striking the elements of the object has been proven. The effectiveness of the improved «rolling sphere» method, implemented in the form of a computer program, which takes into account the given probability distribution of lightning current in the range from 2 kA to 200 kA, has been proved. The expediency of introducing the concept of «average value of the area of the collection area» is substantiated, taking into account the probability of lightning with a current in a given range. It has been established that the application of the standardized formula leads to a significant (many times) overestimation of the predicted number of lightning strikes to the object, if the height of the object exceeds 20 m. The reasons for the difference, according to the author, are due to the following properties of the standardized methodology: usually, the real shape of the object is not taken into account; statistical distribution of lightning current is not taken into account; it is based on the results of experimental studies obtained mainly for mast or rod-type objects in laboratory conditions with a limited discharge interval. Practical value. This approach will provide an opportunity to optimize the layout of lightning arresters during the restoration of objects, taking into account green reconstruction. The obtained results are proposed for consideration by the Technical Committee TC 81 IEC for inclusion in the next editions of the standards.

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confidence: 99%

Determination of the probability of a lightning strike in the elements of the object taking into account the statistical distribution of the current value

Kniaziev

2023

Electrical Engineering & Electromechanics

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Mitigation of Insulator Lightning-Induced Voltages by Installing Parallel Low-Voltage Surge Arresters

2023

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In this paper, we propose a mitigation method for reducing lightning-induced insulator voltages based on the installation of low-voltage surge arresters aligned parallelly to the insulator. The three-dimensional finite-difference time-domain (FDTD) method is applied to numerically model a real surge arrester residual voltage evaluation system. The application of a transient current pulse, typical of lightning discharges, is considered in our numerical model. We considered cases with one or two surge arresters installed per phase, in three different geometric and parametric configurations for installing distribution surge arresters. In addition to the Kirchhoff current division, which reduces both the absorbed energy and the thermal stress, the results associated with the installation of two surge arresters parallelly aligned to the insulator show that the interaction of magnetic fields generated by the surge arresters’ currents can produce an additional strong reduction in lightning-induced voltage over the insulator, as presented in this paper. Conditions for maximum voltage reduction are also identified. A brief cost-effectiveness analysis is also provided.

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Lightning Protection Design for Small Riverboats Using the FDTD Method

Cited by 2 publications

References 16 publications

Determination of the probability of a lightning strike in the elements of the object taking into account the statistical distribution of the current value

Determination of the probability of a lightning strike in the elements of the object taking into account the statistical distribution of the current value

Mitigation of Insulator Lightning-Induced Voltages by Installing Parallel Low-Voltage Surge Arresters

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