Electromagnetic Field Due to Lightning Strike to a Tall Tower Sitting on a Mountainous Terrain

2016 ◽  
Vol 58 (4) ◽  
pp. 1090-1099 ◽  
Author(s):  
Ramin Khosravi ◽  
Seyed Hossein Hesamedin Sadeghi ◽  
Rouzbeh Moini
Keyword(s):  
Electromagnetic Field ◽  
Lightning Strike ◽  
Mountainous Terrain ◽  
Tall Tower

scholarly journals Transient electromagnetic field radiated by grounding systems caused by lightning strike in a dissipative half-space

2017 ◽  
Vol 4 (1) ◽  
pp. 1410986
Author(s):  
T. Rouibah ◽  
A. Bayadi ◽  
N. Harid ◽  
K. Kerroum ◽  
Farrokh Aminifar
Keyword(s):  
Electromagnetic Field ◽  
Half Space ◽  
Lightning Strike ◽  
Transient Electromagnetic

Enhanced method for pulse skin effect calculation of cylindrical conductors

2020 ◽  
Vol 39 (3) ◽  
pp. 623-635
Author(s):  
Nebojsa B. Raicevic ◽  
Slavoljub R. Aleksic ◽  
Ilona Iatcheva ◽  
Marinko Barukcic
Keyword(s):  
Electromagnetic Field ◽  
Density Distribution ◽  
Cross Section ◽  
Current Density ◽  
Skin Effect ◽  
Current Density Distribution ◽  
Accurate Solution ◽  
Lightning Strike ◽  
Content Type ◽  
Cylindrical Conductors

Purpose This paper aims to present a new approach to the numerical solution of skin effect integral equations in cylindrical conductors. An approximate, but very simple and accurate method for calculating the current density distribution, skin-effect resistance and inductance, in pulse regime of cylindrical conductor, having a circular or rectangular cross-section, is considered. The differential evolution method is applied for minimization of error functional. Because of its application in the practice, the lightning impulse is observed. Direct and inverse fast Fourier transform is applied. Design/methodology/approach This method contributes to increasing of correctness and much faster convergence. As the electromagnetic field components depend on the current density derivation, the proposed method gives a very accurate solution not only for current density distribution and resistance but also for field components and for internal inductance coefficients. Distribution of current and electromagnetic field in bus-bars can be successfully determined if the proximity effect is included together with the skin effect in calculations. Findings The study shows the strong influence of direct lightning strikes on the distribution of electrical current in cables used in lightning protection systems. The current impulse causes an increase in the current density at all points of the cross-section of the conductor, and in particular the skin effect on the external periphery. Based on the data calculated by using the proposed method, it is possible to calculate the minimum dimensions of the conductors to prevent system failures. Research limitations/implications There are a number of approximations of lightning strike impulse in the literature. This is a limiting factor that affects the reliability and agreement between measured data with calculated values. Originality/value In contrast with other methods, the current density function is approximated by finite functional series, which automatically satisfy wave equation and existing boundary conditions. It is necessary to minimize the functional. This approach leads to a very accurate solution, even in the case when only two terms in current approximation are adopted.

A reliability study of the lightning locating network in British Columbia

1987 ◽  
Vol 17 (9) ◽  
pp. 1060-1065 ◽  
Author(s):  
David E. Gilbert ◽  
Bruce R. Johnson ◽  
Cedric Zala
Keyword(s):  
British Columbia ◽  
Forest Fires ◽  
Field Tests ◽  
Local Environment ◽  
Lightning Strike ◽  
Mountainous Terrain ◽  
Data Preparation ◽  
Reliability Study ◽  
Analysis Techniques ◽  
Locating System

To combat the major problem of lightning-caused forest fires in British Columbia, the British Columbia Ministry of Forests operates a lightning locating system developed by Lightning Location and Protection Inc. As of 1985, this network consisted of 18 magnetic direction finders located throughout the province. Lightning strike data collected by the network over three fire seasons (1983–1985) were analyzed to estimate the distribution of lightning signal strength and the component detection efficiencies. The analysis was based on more than 165 000 lightning strike records. In the mountainous terrain of British Columbia, the detection efficiencies of the lightning sensors were found to be somewhat lower than earlier results obtained from similar networks in Florida and Oklahoma. Corrective actions have been taken on five detector sites found to have significantly worse than average detection efficiencies. A long-range program to improve the system by refurbishing with upgraded equipment and adding several new detector sites is under way. The statistical results vividly demonstrate the importance of archiving and analyzing the lightning strike data to provide comprehensive local-environment field tests. In future years the data preparation and analysis techniques will be implemented annually.

scholarly journals Analysis of lightning electromagnetic field propagation in mountainous terrain and its effects on ToA-based lightning location systems

2016 ◽  
Vol 121 (2) ◽  
pp. 895-911 ◽  
Author(s):  
Dongshuai Li ◽  
Mohammad Azadifar ◽  
Farhad Rachidi ◽  
Marcos Rubinstein ◽  
Gerhard Diendorfer ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Mountainous Terrain ◽  
Location Systems
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