Navegando por Assunto "Lightning"

Agora exibindo 1 - 4 de 4

Acesso aberto (Open Access)
Análise de sensores de descargas atmosféricas: protótipo de um detector de raios com estimativa de densidade de raios para região amazônica utilizando PSoC
(Universidade Federal do Pará, 2014-02-24) LEAL, Adônis Ferreira Raiol; ROCHA, Brigida Ramati Pereira da; http://lattes.cnpq.br/9943372249006341
This work proposes the design of a prototype for detect lightning, which will, count the number of lightning detected, calculate the density of lightning to the area of operation of the sensor and to estimate the peak of the variation of the electric field for the instant occurrence of discharge. A study of atmospheric electricity, types of lightning, emission of electromagnetic waves during the occurrence of the lightning , types of electromagnetic sensors and lightning detection networks gave subsidy to the design of the prototype . The prototype consists of two antennas, one loop antenna and a flat plate antenna , and electronic circuits , these electronic circuits are implemented mostly in PSoC device ( Programmable System -on - Chip ) , which is a relatively new technology that works with analog and digital signals and also has a CPU to perform the processing of these signals . The validation of the data obtained and estimated coverage area of the sensor, were based on data from STARNET network (sferics Timing And Ranging NETwork). The prototype was designed to be low cost, have a simple and straightforward interface and can be installed in the Amazon region.
Acesso aberto (Open Access)
Otimização da detecção de formas de onda de campos eletromagnéticos emitidos por descargas atmosféricas
(Universidade Federal do Pará, 2018-01-23) LEAL, Adônis Ferreira Raiol; RAKOV, Vladimir; ROCHA, Brigida Ramati Pereira da; http://lattes.cnpq.br/9943372249006341
This work aims the application of optimization techniques to detect and record lightning electromagnetic waveforms. As a result of the optimization techniques developed on this Thesis, it is presented the “Lightning Detection and Waveform Storage System - (LDWSS)”. The main optimized points were: cost of the device; improvements of its detection dynamic range; development of a mobile device; possibility to detect in a multi-band way; and calibration in order to infer peak currents from remote measurements of lightning electric fields. The developed system was validated through comparison of a return stroke data in lightning triggered using the rocket-and-wire technique at the International Center for Lightning Research and Testing - ICLRT, of National Lightning Detection Network – NLDN data, and data from the Lightning Observatory in Gainesville - LOG. The main usage of the optimized system is on the investigation of lightning physics and effects, mainly in the Amazon region. As a result of using the system were obtained: a better understanding about Compact Intracloud Discharge - CID; the characteristics of ionosphere heights computed using intraclound and cloud-to-ground lightning electric field waveforms; the conception of a lightning electric field waveform database containing more than 8 thousand waveforms of different types of lightning; and the implementation of the first continuous lightning electric field measurement system in the amazon region, localized at CESIPAM, Belem, PA.
Acesso aberto (Open Access)
Planejamento de sistemas de proteção contra descargas atmosféricas para unidades habitacionais de baixa renda
(Universidade Federal do Pará, 2014-02-24) SANTOS, Diego Guimarães dos; ROCHA, Brigida Ramati Pereira da; http://lattes.cnpq.br/9943372249006341
This research have the purpose to realize a study about the lightning occurrence profile over the municipalities of Belém, Ananindeua and Marituba, in the period of 1991 to 2011 with the objective to establish the lightning occurrence profile in these municipalities, as well as identify what kind of factors need to be observed and/or identified with the finality to realize an appropriate planning of protection systems against lightning in low income housing builded by the acceleration program of development from the federal government, more precisely in Taboquinha housing, located on the district of Cruzeiro in Icoaraci. After the realization of the comparative analysis with lightning occurrence data proceeding from the lightning detection network STARNET, lightning occurrence data from LIS sensor installed on board of the TRMM satellite, as well as lightning data acquired by the Brazilian Association of Technical Standards NBR 5419, it was possible to conclude that the Taboquinha housing need an appropriate protection system against lightning due to sinister occurrence records involving direct incidence of atmospheric discharges, as well as your secondary effects. In the end of this research will be presented some discussion topics related with some conclusions about the lightning occurrence profile in the present region presented by the NBR 5419 standard, because this incoherent conclusion may harm the public patrimony, as well as the common citizen and their construction.
Acesso aberto (Open Access)
Utilização de satélite geoestacionário para avaliar a incidência de raios em linhas de transmissão do sistema interligado nacional brasileiro
(Universidade Federal do Pará, 2024-07-24) MATOS, Wendler Luis Nogueira; LEAL, Adônis Ferreira Raiol; http://lattes.cnpq.br/4099411616990036; https://orcid.org/0000-0003-0606-2950
Lightning is responsible for the death of people and animals, in addition to damage to the electrical system, within the scope of distribution and transmission networks. One of the main parameters for evaluating the occurrence of lightning is the lightning density in a given region of interest. The GLM sensor, on board the GOES-16 geostationary satellite, allows continuous monitoring of the Americas. Through data processing, it is possible to plot the lightning density for any region within the field of view. The use of this data allows monitoring the occurrence of lightning, helping to identify regions at greater risk of damage associated with lightning. In the case of a large country like Brazil, that has many transmission lines with hundreds of kilometers, forming the National Interconnected System (SIN), it is essential to have updated and regionalized data. Data from the National Electric System Operator (ONS) were processed, and important information about the SIN lines was presented, such as the number of lines per voltage level and their lengths in kilometers, number of line failures per year, per month and by voltage level, as well as the percentage of each type of failure, noting that the main cause of failures is due to lightning, with 25%, being one of the points that supported the importance of this work. The objective of the dissertation is to provide updated lightning density data in the period 2019-2023 for all transmission lines belonging to Brazil's base power transmission network, at the following voltage levels: 230, 345, 440, 500, 525, 600, 765 and 800 kV. Maps were generated for each voltage level, and also a general map for the entire SIN and the entire Brazilian territory. The monthly amount of lightning was compared with the monthly number of faults, observing that the most critical periods of the year are the first and last quarter. Considering all transmission lines, the average lightning density was 11.74 lightning/km2/year, and for Brazil it was 13.17 lightning/km2/year, with a maximum value of 57.62 lightning/km2/ year. Furthermore, the average number of lightning, during the 5 years, was 46 million for the SIN lines and 98 million for Brazil. Finally, a very strong correlation was observed, with a coefficient of 0.91, between the monthly number of lightning and the monthly number of faults caused by lightning, during the observation period.