Engenharia Elétrica Telemática

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https://repositorio.animaeducacao.com.br/handle/ANIMA/2533

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Agora exibindo 1 - 20 de 49

Análise da qualidade de energia em sistema fotovoltaico em operação paralela com a rede de distribuição de energia elétrica
(2017) Fontão, Marcelo Luiz
In a world that is increasingly dependent on electricity, and because of its great demand, it is increasingly indispensable to look for new ways of obtaining it, especially as renewable sources and of little environmental impact. As many sources as possible, photovoltaic solar energy stands out for its practical, reliable and clean shape, and can be inserted into grids, high, medium and low voltage. However, a connection of several micropower plants to the network, tends to bring a possibility of generating disturbances in the same. This work, which is presented, analyzes the quality of electric energy, is not the reference and demonstrates a need to consider the harmonic effects of a photovoltaic plant in networks in the network, through values extracted directly from the network of the plant substation Megawat solar In the city of Florianópolis, SC. Measurements were taken over a period of 8 days with the aid of a power quality analyzer. Arriving at the conclusion that the need to seek alternative sources for a procurement of electricity, should be paved in the quality of procurement energy, so that not implicit in future problems for the network of the utility
Análise de falha do sistema supervisório de unidades geradoras hidráulicas devido a surtos de descargas atmosféricas
(2012) Santos, Cleber Jandir dos; Cidade Junior, Darci
Hydroelectric power plants are structures designed to generate electricity. The continued operation of a HPP (Hydroelectric Power Plant) is a desired condition, the proper function of the plant has become extremely dependent on the performance of digital and electronic equipments of the supervision and control system. Atmospheric discharges are sources of disturbance that can affect the operation of a HPP. This paper presents a study on protection of damage to electronic equipment of the supervisory system of hydropower plants and substations (SE) due to lightning surges, presenting installation level measures to minimize such damage.
Análise do efeito das variáveis radiação solar e temperatura ambiente no dimensionamento de um sistema fotovoltaico OFF-GRID
(2017) Alexandre Neto, Francisco
In the current global energy scenario, a demand for alternative energy sources is increasingly needed. Photovoltaic solar energy is one of these alternative sources and consists of the conversion of the energy radiated by the Sun into electrical energy through the use of photovoltaic modules and this is applicable for systems connected in the network of distribution of energy (on-grid or Grid- Tied systems), as well as in isolated systems, commonly referred to as off-grid systems. The energy production of an off-grid photovoltaic system can be affected by the climatic conditions of the system installation site, solar radiation, ambient temperature, as well as by the technical characteristics of the equipment used in the system (photovoltaic module, charger controller and battery). In this context, the present work presents a study of the effect of the variables solar radiation and ambient temperature on the design of an off-grid photovoltaic system, as well as the effects on energy production. Additionally the main components of an off-grid photovoltaic system are described, being: photovoltaic module, charger controller and energy accumulation system (battery), and a design methodology for an off-grid photovoltaic system.
Análise e implementação de política de QoS: priorizando voz em redes IP
(2009) Oliveira, Carlos Henrique de; Custódio Júnior, Luiz Apolinário
With the increasing convergence of the data and voice networks, the use of this net for applications that need guarantees of parameters, as width of band, delay, variations of delay and tax of losses of packages, becomes necessary the use of quality of service. In this work, a management environment was developed to assist in the control of the quality of service through active measurements. These measurements had facilitated the attainment of information that permits us a fast action in the case of fall of the performance waited for the voice segment on IP. The results had been measured in terms of losses of percentile packages and variation of the delay in the packages (jitter). Some sizes of packages for verification of the influences of the use of QoS had been used. The results of the measurements in nets with QoS and without QoS had been compared, showing that the control of the parameters of QoS is efficient to improve the performance of the applications that demand priorities in the traffic. The architecture of marking DiffServ used in the routers revealed effective for maintenance of the quality of service.
Análise e projeto de filtros passivos para mitigação de harmônicas em sistemas residenciais
(2013) Sartori, Graziela Philippi; Silva, Kleytton Osny Amaral Belarmino da
In the last few years, the increasingly presence of electronic equipment in homes and commercial enterprises caused the consumer demand for better quality energy has been growing and solidifying between the different user profiles. This fact has transformed the profile of the loads of the electricity consumers; with linear loads before and now predominantly with non-linear loads. These non-linear loads insert harmonic currents frequency on the power grids, causing hence the distortion in the waveform of the current supplied. Such distortion impacts on investments in solutions by the electric utilities and the consumers, in order to decrease the circulation of these components in the electric power grid. This paper aims to develop a design and an analysis under the passive filters tuned to residential systems for reduction of harmonic frequencies, which aims to limit the motion of these currents in the power grid, especially the influence of the harmonic component of 3rd order. For this purpose, the insertion of passive filters (shunt type and block) including specific topologies, which have reduced volume, weight and costs in comparison to most conventional arrangements employed and established in the literature.
Análise sistêmica dos benefícios da automação da rede de distribuição de energia elétrica
(2013) Silva, Zenildo Feliciano da
A automação de sistemas elétricos de distribuição está cada vez mais ganhando força de mercado. A diretriz da Automação complementa outros três segmentos não menos importantes: Geração, transmissão e distribuição de energia elétrica. Como tentativa para a diminuição de falhas na rede de distribuição de energia é instalados equipamentos de proteção que possuem o objetivo principal de manter a integridade física da rede, dos consumidores, dos prestadores de serviços e dos equipamentos inseridos no sistema. Assim, este trabalho tem por objetivo fazer uma análise dos benefícios da automação dos sistemas de distribuição de energia elétrica utilizando os dados passados por uma concessionária de energia elétrica de Santa Catarina, buscando valores monetários para justificar os investimentos para tal segmento. Trata-se de uma pesquisa exploratória, prática, na forma de estudo de caso e com abordagem quantitativa sendo que a fonte de dados é primária. O custo total da operação anual de um sistema sem automação foi comparado a um sistema com automação para que fosse possível a verificação da atratividade do investimento, ou seja, o benefício adquirido. Os resultados evidenciam que o benefício trazido pela automação da rede foi de 62% representando o montante de R$ 214.892,38. A pesquisa desenvolvida neste trabalho auxilia as áreas de planejamento, operação e manutenção das concessionárias de energia elétrica na avaliação de seus investimentos em automação considerando os custos de forma sistêmica.
Aperfeiçoamento de placas de circuito impresso com técnicas de indutância e capacitância embarcados
(2018) Dagostim, Daniel
The quick look at the evolutionary history of electronics shows that the huge technological development has brought improvements in different fields, and it has created tools that have contributed to the human evolution by the years. We closely follow the evolution around us day by day and we know that electronics have a fundamental importance on this process. From this context, we are able to say that the printed circuit boards walk side by side to the electronics by following its growing, because of both of them work together. Thus, the idea of starting to study about the layout of the printed circuit boards and their techniques that can boost even more enhancements in this area has motivated this work, which has its main core, the exploration of boards layout design, while it reveals all that has already been researched and developed about the embedded components, in order to explain how it works and also what we can expect from this ascendant technology. Perhaps this study will be taken as an introduction for further researches, or maybe it will also be pointing out the next actions to be taken due to get more knowledge on this area, inside or outside Brazil, in behalf of optimizing circuitry and production economy.
Aprimoramento da iluminação de emergência: controle e consumo consciente
(2017) Souza Hoewell, Carolina de
To obtain a consumer conscious use of resources found in nature, become necessary small actions and changes to some existing energy consumption systems. Allied to this and based on research already done previously, it was thought of an amplification of the operation of an emergency lighting system together with the conscious use of the lighting resources already found naturally in the environments. For this purpose, a set of technologies was used, such as LED (Light Emitting Diode) dimmable, control centers already implemented in the system using work as a base, and an open source technology, currently widely used in Arduino. These use image pickup, alarm outputs, acoustic sensor and a programmable microcontroller, respectively. The project developed in this work of conclusion of course had the objective to expand the initial research of another colleague, which already controls an emergency lighting network, but with complements and controls that effect a more conscious consumption of our natural lighting resources. It will consist of two modules, the one already existing in the previous work, which is the control of emergency lighting built into the existing electrical network and controlled through a specific central and minuteria, along with a microprocessor module of the Arduino to control light sensitivity. The light sensor module will capture the light intensity in the environment and send the signal to be made the light intensity control released by the dimmable LED lamp, which in turn will send the lighting, no more than necessary, to the environment, so there will be no waste in the consumption of electric energy and no excess of clarity that can physically affect the human being. The prototype created was tested with a dimmable LED lamp and a light sensor, type LDR resistor type. The tests performed validate the expectations, thus making its practical application feasible.
Atendimento elétrico energético na Ilha de Santa Catarina: LT 230 KV Biguaçu - Desterro
(2011) Müller, Estela Christina; Dalprá, Makely Regina da Silva
Este trabalho traz um retrato de como ficou o sistema de abastecimento de energia elétrica na Ilha de Santa Catarina, depois do incidente ocorrido em 2003 em que a população ficou sem energia por volta de 55 horas. Ainda são citados os estudos e as soluções adotadas para a confiabilidade do sistema elétrico na ilha e como foco principal a implantação da LT 230kV Biguaçu – Desterro.
Avaliação de conformidade das instalações elétricas de baixa tensão: sua importância, seu processo de realização e suas vantagens
(2018) Silva, Fabiano
The topic safety is one of the most relevant factors when the theme is electricity. Any carelessness in the handling and operation of electrical power can have fatal consequences. Based on this, every scope of projects involving the electrical means has its eyes constantly turned to safety. Since the project development, passing through the various installation stages of the electrical components, till the indispensable stage to ensure this safety, which is the inspection. This way, all these processes that compete for the electrical installation are supported by the Brazilian standards pertinent to each segment, serving as a technical basis for the execution of the inspection. This is the tool to guarantee the compliance with the standards, aiming at safety and various secondary benefits. In Brazil, although we have already demonstrated some bills, the electrical inspection on the instalations is still voluntary. Directly connected to this, we can observe a gradual increase in the number of accidents of electrical origin, a fact that could be reversed, if by chance the inspection occurred to be compulsory, as in the example of others countries where there is already mandatory inspection for any movement of the property, aiming at the safety of users.
Comparativo entre usinas fotovoltaicas: usinas com sistema tracker ou com estruturas fixas
(2017) Martins, Thiago Müller
The present case study aims to demonstrate the most efficient between two types of photovoltaic plants, the one with fixation structures with tracking of solar radiation or the plant with a system of conventional metal fixation structures. Here will be presented a technical and economical comparison between the two models of photovoltaic power plant, using the appropriate tools for it. For comparative purposes, the same equipment will be used in both systems, except for the fixing structures. The same geographical location will also be used in both systems to avoid distortions of radiation from one power plant to another. As for the economic base, the option chosen to study the return on investment was the Simple Payback, which will be based on the initial investment to implement the project and the value of the sale of the energy generated by it in the free energy market.
Corrosão e sistemas de proteção
(2018) Gutihá Junior, Marcos Luiz
ABSTRACT This work is to elucidate the phenomenon of galvanic and electrolytic corrosion. In this case, the study is about the deterioration of metals that are part of the vessels made of fiberglass. In view of the propulsion system, direction and other hydraulic systems that assist in navigation, are made in metal, which are conductors of electricity. All are subject to undergo this process, since they are mostly submerged in a medium-conductive electrolyte, which benefits galvanic corrosion and electrolytic. Just like these, other metallic parts need protection to prevent this phenomenon. In this way, with clarification of the fact that occurred, we can benefit and use the cause of the problem as part of the solution. Through methods and applications of the right materials, we can use other metals with certain characteristics and in this way provide protection, ie using some of these metals serve as anodes of sacrifice.
Desenvolvimento de bancada automatizada para extração do circuito equivalente do motor indução trifásico
(2017) Peixer, Fábio; Silveira, Lucas Groposo
The present work aims to demonstrate the automation of the equivalent circuit extraction process of a 3-phase induction motor. It will be presented the development of an automated workbench that allows to connect a 3-phase induction motor and, with the use of a frequency converter, run the tests of direct current, locked rotor and free rotor, calculating the parameters that constitute the equivalent circuit, presenting the same on a web page. This project covers several contents that were presented during the graduation of electrical engineering and telematics, among them, circuits, electrical drives, power electronics, programming, embedded computing, automation, among others. It will also be presented the validation of the workbench, which indicates that the project can be transformed into a product for commercial use, or even academic, and serve as the basis for other studies, due to the great content covered.
Desenvolvimento de software de monitoramento em uma rede industrial modbus
(2018) Casett, Martina Kelli
Serial communication networks are used to sequentially transfer data through a single path. Among the most employed protocols in this method of digital communications, the MODBUS protocol, on account of its simplicity and wide application, is established as the market standard. This work aims at implement a communication channel using the MODBUS protocol in RTU transmission mode, adopting the RS-485 as the interface standard. This industrial network is composed of elements that integrate a cutting machine, such as variable-frequency drives and an energy analyzer, which are going to be the objects of analysis in this work. With the purpose of monitoring the parameters acquired by the referred devices in an integrated and efficient way, a software will be developed using C# programming language in Visual Studio environment.
Detecção de movimento na automação dos testes de produção de câmeras CFTV
(2011) Silva, Guilherme Schmitt da
This Course Conclusion Work has as goal propose an automated system to expedite the process of final testing of CCTV cameras (acronym for Closed Circuit Tele Vision). This system is based on the theory of motion detection, where the system senses when the user concluded the connection of cameras in the test environment and start assessing the quality of the cameras in question. The system consists of a development's kit by Altera® manufacturer with four inputs, three for cameras connection to be checked and other one to be verified if there no more movement in the test's scenario and so start the test and a standard serial output channel RS232, in which will pass to the user the test result. We used the VHDL synthesis language together the NIOS® processor to compose the system in question.
Diagnóstico em transformadores de potência através de ensaios em campo
(2012) Sousa, Ismael; dos Santos, Rafael Paulo
Transformers are vital elements in the electric power systems. Its eventual failure is commonly associated with several problems on the power system and their consumers. Thus, it is necessary to study techniques for diagnose faults in such equipment, avoiding unexpected failures. Initially, this paper discusses about the theory necessary for understanding how a transformer works, emphasizing the power transformers, whose tests are achieved for improving their performance and reducing possible failures. Some field tests, accomplished in order to detect failure in power transformers are detailed, targeting from small problems to hard faults. In addition, these tests may determine the extension of the breakdown on the device under analysis. The results obtained from field tests are commonly employed as parameters to decide if the power transformer returns to operation or not. A case of study is presented for validate the applicability of the field tests on the power transformer failure detection.
Energias renováveis
(2012) Silva, Ronaldo Alves
A evolução da economia e a melhoria da qualidade de vida da população estão relacionadas à crescente demanda de energia elétrica. Nos próximos anos, com os eventos esportivos como a Copa do Mundo de Futebol, em 2014, e os Jogos Olímpicos, em 2016, esta demanda crescerá ainda mais. Uma forma de ampliar a atual matriz energética é a inserção de outras formas de geração de energia elétrica a partir de fontes renováveis. A fonte solar fotovoltaica destaca-se, pois além de poder gerar energia de forma distribuída, é inesgotável, silenciosa, simples e limpa, contribuindo com o meio ambiente. O Objetivo deste trabalho consiste na realização de um estudo concernente a esta tecnologia, com pesquisa bibliográfica, para avaliar sua evolução, e sua aplicação em edificações, de modo a verificar sua viabilidade em estádios e arenas desportivas, por exemplo, integrando estes edifícios ao sistema como usinas de geração elétrica e, portanto, aliviando sua carga
Ensaios para diagnóstico das falhas em transformadores de potência
(2017) Pires Junior, José Nilton; Pacheco, Leandro Gonçalves
Transformers are extremely important equipment both in the Brazilian electrical system and inside the companies. Failure of this equipment can have serious consequences both in the financial sphere and in the safety of the people who surround it in carrying out the proper maintenance. This work initially presents the necessary theory to capture the perception of the operation of this equipment, simplifying and giving opportunity for a better understanding of the tests that can be practiced for the analysis and diagnosis of transformer faults, highlighting the importance of conventional field tests and a case study, concerning the chromatographic analysis of gases dissolved in insulating oil in a high voltage power transformer, confirming the applicability of the tests proposed herein, where through the analysis performed an internal insulation failure that could have caused the loss of the transformer.
Estudo da implementação de redes Long Term Evolution em Florianópolis/SC
(2013) Pereira, Leandro; Sens Junior, Nilto
The chapter Architecture of Cellular Networks, presents the evolution of network releases of 3GPP (3rd Generation Partnership Project), the logical architecture of the E-UTRA (Evolved - Universal Terrestrial Rádio Access) with interfaces and protocols associated with it as well as the logical architecture of the EPC (Evolved Packet Core). While in LTE (Long Term Evolution) Air Interface Principles, we describe the techniques used in rádio interface for uplink and dowlink considering the principles of OFDM (Orthogonal Frequency Division Multiplexing) and its channel structure of the air interface. It's also detailed the time domain structure of the rádio interface in the uplink and downlink for FDD (Frequency Division Duplex) and TDD (Time Division Duplex), the principles of OFDMA in downlink, SC-FDMA (Single Carrier Frequency Division Multiplexing) in uplink, MIMO (Multiple Input Multiple Output) and the role of MBMS (Multimedia Broadcast Multicast Service) in LTE. The case study on the activation of LTE network in Florianópolis, exposes the motivation for the implementation of 4G service in Brazil, the frequencies tendered for this purpose, the equipment used for signal transmission, coverage simulations and evaluation of the results obtained after activation of the network.
Estudo, desenvolvimento e implementação de conversor estático tipo buck em malha fechada
(2013) Anselmo, Aliny; Martins, Priscila Gomes dos Santos
The main purpose of this work is to study, design and implementation of a type converter dc-dc buck that from a continuous source of 24 V, will supply loads in 12 Vdc, with powers up to 12 W. Therefore, will be realized a detailed theoretical and a study on the characteristics of this converter, followed by simulations, assembly and testing of a prototype. Finally, in order to validate the concepts, will be present both results from simulation and experimentation, simultaneously.

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