A statistical analysis on the risetime of lightning current pulses in negative upward flashes measured at Santis tower

Romero, Carlos (Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland) ; Paolone, Mario (Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland) ; Rachidi, Farhad (Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland) ; Rubinstein, Marcos (School of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland) ; Pavanello, Davide (School of Engineering, HES-SO Valais-Wallis, HEI, HES-SO // University of Applied Sciences Western Switzerland) ; Giri, Dave V. (Pro-Tech, Alamo, CA, USA)

We present statistical data on the risetime of lightning current pulses in negative upward flashes measured on the Säntis tower in 2010 and 2011. Two different definitions were used to determine the current risetime. The first is the t 10-90 rise time usually adopted in lightning applications and lightning standards. The second one is the risetime associated with the maximum rate of rise t mr given by the ratio between the current peak and the current maximum derivative. The obtained statistical values for t mr are found to be substantially smaller than those for the classical t 10-90 , the median and geometrical mean for t 10-90 (0.9 μs and 1.08 μs, respectively) being 3 times larger than those associated with t mr (0.3 μs and 0.37 μs). The relation between the risetime and the maximum significant frequency of the measured pulses is also discussed. It is shown that, in general, the t mr definition is more consistent with the maximum frequency content of the signals, compared with the t 10-90 risetime.


Keywords:
Conference Type:
full paper
Faculty:
Ingénierie et Architecture
School:
HEIG-VD
Institute:
IICT - Institut des Technologies de l'Information et de la Communication
Publisher:
Vienna, Austria, 2-7 September 2012
Date:
2012-11
Vienna, Austria
2-7 September 2012
Pagination:
5 p.
Published in:
Proceedings of 2012 International Conference on LIghtning Protection (ICLP), 2-7 September 2012, Vienna, Austria
DOI:
ISBN:
978-1-4673-1897-6
Appears in Collection:

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 Record created 2020-10-20, last modified 2020-10-27

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