Teses e Dissertações não defendidas no IFAL
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Item Modelagem e Simulação de Indicadores de Continuidade: Ferramenta Auxiliar para a Manutenção em Redes de Distribuição de Energia Elétrica(2017) Magalhães, Emerson Felipe Araujo; Costa Filho, Marcus Vinícius Americano da; Magalhães, Robson da Silva; Pontes, Karen Valverde; Ávila Filho, Salvador; Oliveira, Tiago Cordeiro deThe reliability of the electricity distribution systems is associated with the many investments that are implemented, specifically when the design of new projects and during the programming of maintenance activities. The Brazilian electric sector has been experiencing countless problems over time, with the greatest of these problems related to the constant failures in the distribution system. Occurrences of these failures influence the composition of the continuity indicators of Equivalent Duration of Unit Interruption Consumer (DEC), and Equivalent Frequency of Interruption of Unit Interruption Consumer (FEC); which are established by the National Electric Energy Agency (ANEEL), for each concessionaire, and if they are not fulfilled, the concessionaires will be subject to fines. This work proposes the development of models, using Multiple Linear Regression techniques (MLR) and Artificial Neural Networks (ANNs), which predict the values of these continuity indicators, aiming to assist the concessionaire in carrying out a more efficient planning for performing maintenance tasks. As an object of study, a collection of consumers was used from a concessionaire in the Northeast region. From the modes of failures occurring in the circuits that feed this set of consumers, the causes and frequencies of interruption in the electricity supply are analyzed, and how much these contribute to the increase in the values of DEC and FEC. Through the application of the developed models, you can evaluate the influence of certain modes of failures on DEC and FEC, prioritizing maintenance tasks in the equipment that contribute to the composition of these indicators. It is demonstrated that the knowledge of the influence of the modes of failures on the DEC and FEC indicators allows a proper decision-making on the implementation of maintenance actions, enabling the concessionaire to perform an efficient operation on those modes of flaws that are more and contributing to the operational stability and reliability of the entire electrical system.Item Modelo para predição de indicadores de continuidade em um sistema de distribuição de energia elétrica, uma aplicação à gestão de manutenção com a perspectiva do uso da termografia(2016) Araújo Junior, José Arnóbio de; Magalhães, Robson da Silva; Esquerre, Karla Patrícia Santos Oliveira Rodriguez; Bandeira, Anselmo Alves; Silva, Magno José Gomes daThe Electrical power distribution system (SDEE) of most of the Northeast region concessionaires are old and present different kinds of problems. In an indirect way, these problems can be verified through the collective indicators of continuity, provided by the National Electric Energy Agency (ANEEL). These indicators include the Interruption Equivalent Duration per Consumer Unit (DEC) and the Interruption Equivalent Frequency per Consumer Unit (FEC). In order to improve these indicators, this study proposes a methodology to be applied in the analysis of the history of occurrences (interruptions in power supply) registered in an electricity distribution concessionaire, from January 2013 to December 2014. The methodology proposed here is based on the construction of a model that establishes the DEC and FEC indicators. Once the proposed model is constructed, considering the period of operation of the SDEE to be analyzed, we intend to set the values of DEC and FEC, according to the observed and recorded occurrences for this system. The prior knowledge of DEC and FEC indicators allows the maintenance management, making it possible to measure the influence of the main failure modes on the composition of these indicators. As a basis for the elaboration of the analysis methodology and that of the model, we carried out a research, together with an energy distribution concessionaire, which will be denominated, in this work, as concessionaire A. This research involves a survey of the occurrences of failures (with interruption) within a group of consumers. Data was collected monthly, from January 2013 to December 2014. From these data, a model structure based on Multiple Linear Regression Analysis (ARLM) was constructed. There is, on the part of concessionaire A, the intention to develop maintenance actions that apply thermographic techniques. These techniques allow the thermal gradient mapping of a given energized device, distinguishing different temperatures by means of infrared radiation. For this purpose, the concessionaire A has invested on equipment and personnel training. This study proposes the application of the model which was built, based on ARLM, as a support tool to evaluate the influence of failure modes on the composition of continuity indicators (DEC and FEC). The failure modes of greatest interest are those that are likely to be detected by thermography. The prior knowledge of the influence of failure modes on the composition of these indicators will enable a decision making, aiming at the execution of maintenance actions, allowing the concessionaire to perform a direct action on the feeder and on the most influential modes of failure, especially on those that can be detected by thermography.Item Programa mulheres mil: história de vida como possibilidade de avaliação e implementação de políticas públicas(2024) Oliveira, Evilma dos Santos; Galvão, Vivianny Kelly; Pereira, Jesana Batista; Mendonça, Adriana de Lima; Monteiro, Lorena Madruga; Lima, Antônio Carlos Santos de; Brasileiro, Regina Maria de OliveiraThe present research proposes a reflection on public policies and government programmes aimed at women in Brazil, using as a shortcut the Mulheres Mil Program in the period from 2005 to 2019 and its developments at the Federal Institute of Alagoas. Since the Mulheres Mil Program is a public policy of combating gender inequalities, reducing poverty, raising schooling and reducing violence against women, the design of this study is organized to answer the following question: does the women's mil Program envisage in its formulation commitments with productive inclusion and with the tackling of gender disparity, thus contributing to the full exercise of citizenship of women served? To this end, we systematically and analytically identified the formulations of public policies for women, the advances and challenges of the National Policies Plans for Women, the proposal of the Women's Mill as a social policy of inclusion and gender and the perception of the progress from vocational training and incentive to formal education in the courses offered. Faced with the object of study, the research focused on a qualitative approach using oral history as a method. The life stories of ten graduates who were beneficiaries of the Mulheres Mil Program at the Federal Institute of Alagoas were analyzed. The data collection took place between October 2022 and January 2023 in face-to-face meetings to build their life stories. The narratives were categorized around three axes: the socio-economic profile of the women interviewed, the elevation of the schooling of the graduates after participating in the Program and the insertion of women in the formal labour market according to the vocational training received. The narratives reveal that the exgresses are in the age group between 29 and 61, 70% are married and have between 01 and 06 children. Most (60%) have completed secondary education, but only 10% have continued their studies after participating in the Programme. The analysis on the income of the graduates shows that 50% are engaged in some kind of paid activity. It was also noticed that the beneficiaries were able to put in practice the knowledge acquired in the courses, but were not inserted into the formal labour market. The life stories of the women interviewed revealed that the participation of the Program had positive effects in relation to the rescue of self-esteem, the discovery of their rights and the living with a citizen education. With regard to the increase in schooling, it was found that a significant proportion (90%) of the graduates failed to resume their studies. The results demonstrate the importance of fostering debate on the challenges in formulating and implementing public policies for women.