Concepção e desenvolvimento de um medidor de impedância impulsiva de aterramentos de linhas de transmissão

• Ano de defesa: 2014
• Autor(a) principal: Breno Dias Rodrigues
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Engenharia Elétrica; Engenharia elétrica; Sistemas de energia eletrica; Correntes elétricas Aterramento
• Link de acesso: http://hdl.handle.net/1843/BUOS-9MHJXH

This Ph.D dissertation presents a new grounding impedance measuring system, based on DSP (Digital Signal Processor) platform. The low-cost portable device includes a built-in voltage impulse generator, non-volatile memory for storage of measured current and voltage waves and a graphical display for fast data visualization and user interface. The device includes an integrated controller that is able to process the calculations required to yield complete results, even in absence of PC laptop support. Though the primary application is focused on the measurement of transmission line tower-footing impedance, it can be extended to the measurement of any electrode arrangement. In this text, general hardware structure overview and software implementation are presented. Consistent preliminary field-test results were provided by the measuring system, consisting of records of grounding potential rise and impressed current, impulse impedance and estimated low-frequency grounding resistance obtained for different electrode arrangements buried in low and high resistivity soils. The results demonstrate that this portable low-cost, low-weight, stand-alone impedance measuring system based on DSP processor consists of an effective tool for assessing the lightning response of grounding electrodes and can be very useful in lightning protection applications.