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Advisor(s)
Abstract(s)
A presente dissertação é realizada no âmbito do Mestrado em Engenharia Eletrotécnica Sistemas Elétricos de Energia, com a colaboração da empresa Efacec - Máquinas e Equipamentos Elétricos, localizada em São Mamede de Infesta, Porto. As subestações móveis são instalações elétricas desenvolvidas para serem inseridas na rede de distribuição de energia, essencialmente aquando da necessidade de manutenção de
infraestruturas fixas da rede, desempenhando um papel de caráter temporário, porém essencial para manter a continuidade de serviço e fiabilidade. Realizar o estudo para a determinação de quais as proteções a utilizar e o seu correto dimensionamento pode se tornar uma tarefa bastante demorada e complexa, pois requer a
análise de várias grandezas como a tensão, potência, correntes de curto-circuito trifásicas, monofásicas, tempo de atuação das proteções e distâncias mínimas de isolamento. Assim, para garantir a fiabilidade e segurança de escolha dos equipamentos a selecionar torna-se necessário a realização de um dimensionamento adequado, rápido e o mais customizado possível para que vá ao encontro com as características pretendidas pelos clientes. A solução encontrada foi a realização de uma aplicação computacional, desenvolvida em Microsoft Excel, possuindo um conjunto de algoritmos que com a introdução de alguns dados iniciais, realize o dimensionamento adequado e o apresente de um modo expedito. O
desenvolvimento da aplicação informática pretende dotar o utilizador de um conjunto de dados fundamentados que permitam a adequada escolha da proteção a aplicar. A aplicação em causa estará descrita ao longo da dissertação. Nesta dissertação encontram-se descritas as principais características das subestações móveis,
nomeadamente como podem ser classificadas e os seus principais constituintes, os cálculos necessários para termos o correto dimensionamento das principais proteções e detalhadas as características da aplicação computacional criada. Para concluir a dissertação, serão apresentados alguns casos de estudo que demonstrem como a aplicação criada consegue solucionar o problema em questão.
This dissertation is being carried out as part of the Master's in Electrical Engineering - Electrical Power Systems, in collaboration with the company Efacec - Máquinas e Equipamentos Elétricos, located in São Mamede de Infesta, Porto. Mobile substations are electrical installations designed to be inserted into the energy transmission and distribution network, essentially when network infrastructures need to be maintained, playing a temporary but essential role in maintaining continuity of service and reliability. Carrying out a study to determine which protections should be used and their correct sizing can become a very time-consuming and complex task, as it requires analyzing various variables such as voltage, power, three-phase and single-phase short-circuit currents, protection actuation time and minimum insulation distances. Therefore, to guarantee the reliability and safety of the equipment to be selected, it is necessary to carry out an appropriate sizing, as quickly as possible and as customized as possible so that it meets the characteristics desired by the clients. The solution found was to create a computer application, developed in Microsoft Excel, with a set of algorithms that, with the input of some initial data, carry out the appropriate sizing and present it in an expeditious manner. The development of the computer application is intended to provide the user with a set of well-founded data that will allow the appropriate choice of protection to be applied. This application will be described throughout the dissertation. This dissertation describes the main characteristics of mobile substations, namely how they can be classified and their main constituents, the calculations needed to correctly size the main protections and details the characteristics of the computer application created. To conclude the dissertation, some case studies will be presented that demonstrate how the application can solve the problem in question.
This dissertation is being carried out as part of the Master's in Electrical Engineering - Electrical Power Systems, in collaboration with the company Efacec - Máquinas e Equipamentos Elétricos, located in São Mamede de Infesta, Porto. Mobile substations are electrical installations designed to be inserted into the energy transmission and distribution network, essentially when network infrastructures need to be maintained, playing a temporary but essential role in maintaining continuity of service and reliability. Carrying out a study to determine which protections should be used and their correct sizing can become a very time-consuming and complex task, as it requires analyzing various variables such as voltage, power, three-phase and single-phase short-circuit currents, protection actuation time and minimum insulation distances. Therefore, to guarantee the reliability and safety of the equipment to be selected, it is necessary to carry out an appropriate sizing, as quickly as possible and as customized as possible so that it meets the characteristics desired by the clients. The solution found was to create a computer application, developed in Microsoft Excel, with a set of algorithms that, with the input of some initial data, carry out the appropriate sizing and present it in an expeditious manner. The development of the computer application is intended to provide the user with a set of well-founded data that will allow the appropriate choice of protection to be applied. This application will be described throughout the dissertation. This dissertation describes the main characteristics of mobile substations, namely how they can be classified and their main constituents, the calculations needed to correctly size the main protections and details the characteristics of the computer application created. To conclude the dissertation, some case studies will be presented that demonstrate how the application can solve the problem in question.
Description
Keywords
Mobile Substations Short-Circuit Current Protection Sizing Electrical Clearances Overvoltages Subestações móveis Correntes de curto-circuito Dimensionamento de proteções Distâncias de isolamento Sobretensões