Dissertações
URI permanente para esta coleçãohttps://rigalileo.itegam.org.br/handle/123456789/174
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Item Barrido de frecuencia en coordenadas de fase(INSTITUTO DE TECNOLOGIA, 2012) PÉREZ ABRIL, Ignacio; CABRAL LEITE, Jandecy; MAGALHÃES, Edilson MarquesThe paper develops a phase-coordinates model for analyzing unbalanced electrical networks, enabling the specification of single-phase or three-phase harmonic injections of any sequence. The model is applied to a four-wire delta system, demonstrating its ability to represent structural asymmetries and identify resonances at different frequencies.Item Implementação de Medidas e Uso de um Software Supervisório na Eficiência Energética de um Sistema de Refrigeração Industrial(Instituto de Tecnologia, 2023) RAABE, Matheus Arthur; SILVA, Pedro LuizThis paper aims to present the results of implementing a set of energy efficiency measures, supported by a supervisory software, in an industrial refrigeration system installed in a dairy factory. The study involved the collection and analysis of electric energy consumption data, equipment operation, and identification of improvement opportunities. With the implementation of actions such as evaporation temperature control, optimization of compressor operation, and the introduction of maintenance routines, a significant reduction in energy consumption and improvement in system reliability was observed. The results demonstrate the potential for energy and operational gains through the use of automation and supervision technologies in industrial processes.Item Diagnóstico de Faltas no Sistema Elétrico de Potência (SEP) e Recomposição Automática via Sistema Digital de Controle Distribuído (SDCD): Aplicação na Hydro Alunorte para Redução de Perdas de Produção(Instituto de Tecnologia, 2015) MORAES, Sidney José da Silva; VIEIRA JUNIOR, PetrônioThis study introduces a tool for fault diagnosis and automatic restoration of the electrical system at Hydro Alunorte using a Distributed Digital Control System (DCS) and fuzzy logic. The aim is to reduce analysis and recovery time, minimizing production losses associated with power interruptions. The methodology involves selecting strategic substations, analyzing historical events, and developing intelligent systems for automated decision-making.Item Utilização do Protocolo IEC61850 para Implementação de Seletividade Lógica em um Sistema de 13,8 kV com Múltiplas Fontes e Topologia em Anel" Subtítulo: Aplicação em Subestações Elétricas Industriais para Melhoria de Desempenho e Confiabilidade(Instituto de Tecnologia, 2015) SANTOS, Sidnei José Gonzaga; VIEIRA JUNIOR, PetrônioThis study describes the implementation of logical selectivity in a 13.8 kV industrial electrical system using the IEC 61850 protocol, aiming to reduce protection operating times from 0.85-1.05 seconds to 0.1 seconds. The solution was applied at the SE-56C-1 substation of Hydro Alunorte, utilizing a low-cost communication network to enhance system safety and reliability. The project was validated through simulations and a real short-circuit event, proving its effectiveness in equipment protection and operational continuity.Item Desenvolvimento de Lógica para Automatização das Manobras nos CCMs da Precipitação para Retorno de Energia em Caso de Falta Total ou Parcial(Instituto de Tecnologia, 2015) PANTOJA NETO, Getulio Furtado; SILVA, Orlando Fonseca.The national electric grid, predominantly hydroelectric, faces instability due to water scarcity, exposing continuous process industries, such as alumina refineries, to production stoppage risks. This work proposes an automation logic for maneuvers in Motor Control Centers (MCCs) of the precipitation area, aiming to reduce energy downtime and eliminate human errors. The solution uses the plant's central controller to supervise and act in cases of total or partial power failure, ensuring restoration in less than 10 minutes and avoiding significant losses.Item Implantação do Sistema de Rejeição de Cargas (SRC) no Sistema Elétrico de Potência (SEP) da Hydro Alunorte(Instituto de Tecnologia, 2015) CORRÊA, José Luiz; COSTA JUNIOR, Carlos Tavares daThe study presents the implementation of a Load Rejection System (LRS) at Hydro Alunorte to preserve internal power generation and partial production during external power failures. The LRS, using frequency relays, automatically sheds non-priority loads, ensuring the continuity of utilities (water, steam, and compressed air) and minimizing financial losses. The system was successfully tested in real events, demonstrating its effectiveness.Item Análise da Blindagem Eletrostática por Elementos Finitos de Dispositivo Tipo Gaiola de Faraday para Pinos de Isoladores de Disco(Instituto de Tecnologia, 2018) SILVA, José Eduardo Ribeiro da; Marcos Allan Leite dos ReisHigh-voltage disc insulators are devices used in power transmission or distribution networks, serving to support the conductive cables while simultaneously providing electrical insulation. These insulators consist of a metal cap, a metal pin, and a glass or porcelain disc. The combined effects of atmospheric pollution, humidity, and intense electric fields on these insulators facilitate the occurrence of electrical discharges on the central region of the pins, accelerating their corrosion and eventual rupture, which can lead to catastrophic failures in the electrical system. In this work, an electrostatic shielding device called the "Faraday Cage for Disc Insulator Pins" was developed to shield the intermediate region of the pins from the effects of external electric fields. Additionally, a super-hydrophobic coating was proposed for the glass surface of the insulators to facilitate the removal of atmospheric contaminants that induce the formation of voltaic arcs directed towards the pin surface. Experimental tests were conducted using a Van der Graaf generator on a pin protected by the first prototype of the device. Furthermore, computational simulations based on the Finite Element Method were performed to analyze the electric field distribution in 2D models of insulator chains subjected to 69 kV voltages. The experimental and numerical results demonstrated that the device effectively prevented electrical discharges in the pin’s most corrosion-prone area, confirming the efficiency of the electrostatic shielding.Item METODOLOGIA DE ATERRAMENTO EM LINHA DE TRANSMISSÃO EM CORRENTE ALTERNADA 550 kV NA AMAZÔNIA – UM ESTUDO DE CASO(Instituto de Tecnologia, 2021) CARVALHO, Franklin Barbosa; NASCIMENTO, Manoel Henrique ReisLightning strikes are of great importance for the electricity sector, frequently responsible for disconnections of transmission lines, which can trigger a sequence of events that may lead to the collapse of the interconnected electrical system. The objective of this work is to propose a new methodology to correct the grounding resistances of the LT Oriximiná/Silves CD 550kV electric power transmission line in the Amazon, aiming to reduce the occurrences of shutdowns caused by disruptive return discharges (backflashover) and mitigate the damages to the electrical system. Considering implementation cost factors, environmental technical feasibility, and the applicability of the solution to other line structures, it was concluded that the most adequate approach for a more robust grounding solution in the transmission line towers was the "solution 03," tested on tower 585, achieving a 66.98% reduction.Item REDUÇÃO DO CUSTO DE PASTA DE SOLDA NO PROCESSO DE TECNOLOGIA DE MONTAGEM SUPERFICIAL (SMT)(Instituto de Tecnologia, 2021) CAMARGO, Marco Antônio de Almeida; BRAGA, Eduardo de MagalhãesThe Surface Mounting Technology (SMT) industries have faced constant challenges regarding environmental issues and cost reduction. The welding of electronic components traditionally incorporates lead, which presents environmental and financial risks due to the high cost of solder paste. The objective of this dissertation is to present the development of the local solder paste manufacturing process to reduce production costs while maintaining the quality and reliability of the product, especially in television electronic boards. The study includes a literature review on the SMT process and a case study in a factory located in the Manaus Industrial Pole (PIM). The results show that adopting local suppliers can generate significant savings by minimizing costs related to importation and logistics.Item Análise dos Impactos Harmônicos na Qualidade da Energia Elétrica Utilizando KDD – Estudo de Caso na Universidade Federal do Pará(Instituto de Tecnologia, 2019) SILVA, Waterloo Ferreira da; TOSTES, Maria Emilia de LimaThis work presents an analysis of data related to Power Quality (PQ), focusing on the significant increase in harmonic distortion levels of current and voltage due to the growing use of non-linear loads and power electronics-based equipment. A methodology was developed using computational intelligence (CI) and data mining techniques to analyze data collected by power quality meters installed at the Federal University of Pará (UFPA). The KDD process was applied, including collection, selection, cleaning, integration, transformation, reduction, mining, interpretation, and evaluation of the data. The Naive Bayes classifier was used in the data mining phase, and the results demonstrated the applicability of the KDD process in the analysis of Total Harmonic Distortion of Voltage at the Common Coupling Point, which can be applied in commercial, residential, and industrial areas.
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