A lightning location system in China: its performances and applications

Naccarato

Geophysical Research Letters

et al. 2006

[1] This paper presents a comparison among the mean monthly distributions of the number of cloud-to-ground (CG) flashes, the percentage of positive CG flashes and the peak current of negative and positive CG flashes obtained in Brazil for the period from 1999 to 2004, with the same distributions observed by similar networks for long time periods in other countries. From a correlation analysis, it was found that the mean monthly distributions of the number of CG flashes are very similar, even though the period of larger lightning activity along the year in Brazil, a tropical country, is longer than in the other temperate countries. The mean monthly distributions of the percentage and the peak current of positive CG flashes are also very similar, while the mean monthly distribution of the peak current of negative CG flashes in Brazil differs from the other countries. This difference is related to a significant decrease in the mean negative peak current in Brazil in the months of August and September. Apparently, the decrease is related to the injection in the atmosphere of large amounts of smoke from fires in these months, since the results also show a significant correlation between the monthly distribution of the number of fires and the negative peak current. Citation: Pinto, O., Jr., K. P. Naccarato, I. R. C. A.Pinto, W. A. Fernandes, and O. P. Neto (2006), Monthly distribution of cloud-to-ground lightning flashes as observed by lightning location systems, Geophys. Res. Lett., 33, L09811,

Section: Introductionmentioning

confidence: 99%

Monthly distribution of cloud‐to‐ground lightning flashes as observed by lightning location systems

Naccarato

Geophysical Research Letters

et al. 2006

Ingeniare. Rev. chil. ing.

“…Although the transmission line model used in this work has some limitations, it is in the characterization of lightning where the limitations are more important. In fact, most EMTP-like tools have capabilities that allow users to develop models more accurate and sophisticated than some of those used in this work; however, the uncertainties with which lightning strokes are represented and the fact that modern detection systems cannot provide good estimates of all lightning parameters are more obvious and important limitations [31][32][33].…”

Section: Discussionmentioning

confidence: 99%

Emtp Implementation of a Monte Carlo Method for Lightning Performance Analysis of Transmission Lines

Martínez-Velasco

Castro‐Aranda

2008

El cálculo riguroso de sobretensiones de origen atmosférico es un aspecto importante en el análisis y diseño de líneas aéreas de transmisión. Las diferentes partes de una línea que están involucradas en las sobretensiones causadas por el rayo deben ser representadas teniendo en cuenta el rango de frecuencia de los transientes causados por el impacto de una descarga atmosférica. Por otro lado, los procedimientos a emplear en el cálculo de sobretensiones deben ser desarrollados teniendo en cuenta la naturaleza aleatoria del rayo. Varias herramientas de cálculo han sido empleadas hasta la fecha para estimar el comportamiento de líneas aéreas de transmisión frente al rayo. Los procedimientos más utilizados emplean una técnica basada en el dominio del tiempo para la que se han de desarrollar y aplicar modelos adecuados de las distintas partes de una línea. Este artículo presenta un resumen del trabajo realizado por los autores para desarrollar e implantar en una herramienta de simulación tipo EMTP (ElectroMagnetic Transients Program) un procedimiento basado en el método de Monte Carlo que permita analizar el comportamiento frente al rayo de líneas aéreas de transmisión. Los resultados presentados en este documento se basan en una línea real cuyo análisis permitirá ilustrar el alcance del procedimiento y el tipo de estudios que se puede realizar con el procedimiento desarrollado. Palabras clave: Sobretensiones, modelación, EMTP, método de Monte Carlo, efectos del rayo.

IEEE Trans. Power Delivery

“…A lightning location system (GDLLS) was put into operation in 1997 in the grid of Guang-Dong Electric Power Co. (GDEPC) [11]. This system consists of 11 combined magnetic direction and time-of-arrival finders (DTFs), one network position analyzer (NPA), and one lightning location information analyzer and display system (LIADS).…”

Section: Gdllsmentioning

confidence: 99%

Lightning Data Observed With Lightning Location System in Guang-Dong Province, China

Chen

Fan³

2004

Self Cite

This paper presents an investigation into cloud-to-ground lightning activity data collected by a lightning detection system in the Guang-Dong Province, the southernmost in China. Annual lightning days are acquired and ground flash density maps are constructed from the database, which contains the information of more than one million flashes. The lightning days are compared with annual thunderstorm days collected by the Guang-Dong Meteorological Agency, and a weak correlation is noted. The correlation between ground flash density and thunderstorm day is studied, and an empirical formula is presented. The relationship between transmission line faults and ground flash density is discussed in this paper too. It is noted that the correlation with the faults caused by lightning is relatively high. The correlation coefficient does not significantly vary with the threshold of discharge current set for constructing the map of revised ground flash density.