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Master's Dissertation
DOI
https://doi.org/10.11606/D.18.2020.tde-27022020-145658
Document
Author
Full name
Felipe Schiavon Inocencio de Sousa
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2016
Supervisor
Committee
Altafim, Ruy Alberto Corrêa (President)
Piantini, Alexandre
Thomazini, Daniel
Title in Portuguese
Transdutor de pico de correntes de descargas atmosféricas para instalação em estruturas elevadas
Keywords in Portuguese
Aquisição de sinais
Armazenamento de dados
Bobina de Rogowski
Corrente impulsiva
Estruturas elevadas
Pico de corrente
Transdutor de corrente
Abstract in Portuguese
Este trabalho descreve um novo transdutor para medir os picos de correntes impulsivas originárias de descargas atmosféricas em torres elevadas, à exemplo das dedicadas à telefonia móvel. Os componentes do sistema constituem em uma bobina de Rogowski auto-integradora, fixada no topo da torre, um cabo coaxial, e uma unidade de aquisição do sinal alocada na base da torre. A bobina de Rogowski, fixada na base superior da torre, próxima ao captor do sistema de proteção de descargas atmosféricas, gera em seus terminais um sinal elétrico proporcional à variação do campo magnético produzido pela corrente da descarga, que é injetado no cabo coaxial. O sinal é transmitido com o mínimo de distorções até a base da torre. Conectado ao cabo está um osciloscópio que mede e armazena o sinal. O projeto foi simulado com o auxílio de softwares de análise de circuitos. Para a definição de todos os elementos deste projeto, foi realizada uma análise bibliográfica sobre descargas atmosféricas, particularmente sobre corrente impulsivas, campos magnéticos gerados e elementos de transdução por acoplamento magnético. Inicialmente as estruturas mecânicas foram modeladas no software Inventor para posterior confecção. Ensaios foram realizados no Instituto de Energia e Ambiente da Universidade de São Paulo para aferir o comportamento do sistema em situações de operação em correntes elevadas e como forma de calibração do sistema.
Title in English
Lightning peak current transducer for installation on tall structures
Keywords in English
Current peak
Current transducer
Data storage
Impulsive current
Rogowski coil
Signal acquisition
Tall structures
Abstract in English
The present work introduces a new transducer for measuring the peak of impulsive currents originated from tall structures, such as those related to telecommunication. The components of the system are the Rogowski coil, fixed on the top of the tower, the coaxial cable and an oscilloscope allocated at the base of the tower. The coil, fixed on the platform located on the tower top next to the lightning discharge protection system, generates an electric signal on its terminals that is proportional to the magnetic field variation generated by the current of the discharge. The signal is transmitted with a minimum distortion through the cable. An oscilloscope is connected to the cable and it measures and store data obtained from the signal. The project was simulated using circuit analysis software. In order to develop all the components of the system, an extensive literature review was performed, particularly related to impulsive currents, related magnetic fields and magnetic coupling transducers. The mechanical structures were designed using the Inventor software for further construction. The first calibration tests were already performed. Tests were performed at the Instituto de Energia e Ambiente (IEE-USP) to calibrate the system and to determine the system behavior when working with impulsive peak currents.
 
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Publishing Date
2020-03-13
 
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