Made available in DSpace on 2014-06-12T17:37:46Z (GMT). No. of bitstreams: 2 arquivo5337_1.pdf: 2712381 bytes, checksum: ef54386909f89cae6f4af5d76ab17550 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2008 / Companhia Hidro Elétrica do São Francisco / Nos Sistemas Elétricos de Potência, os Compensadores Estáticos CE são equipamentos de elevada importância na regulação de tensão, tanto em regime permanente como em transitório, principalmente em sistemas onde os centros de carga estão localizados a grandes distâncias da geração. Esta dissertação, apresenta uma análise das causas de falha do Compensador Estático instalado na Subestação - SE de Fortaleza da Companhia Hidro Elétrica do São Francisco - CHESF, estado do Ceará, Brasil, com ênfase nas origens das falhas e em suas soluções, utilizando como ferramenta de análise a Árvore de Falhas deste Equipamento. Neste trabalho, encontramos a Árvore de Falhas do CE, composta por 62 eventos básicos, dos quais 20 apresentaram histórico suficiente para a análise paramétrica em um banco de dados de 22 anos. A partir das curvas de probabilidade de falha dos eventos básicos, elaborou-se um plano de ação com melhorias nos processos de manutenção, para viabilizar a elevação da disponibilidade do CE, com o objetivo de maximizar a remuneração da empresa Transmissora, no caso, a CHESF, e a confiabilidade do sistema de transmissão

No / Fault management is one of the important management functions of a telecommunication network and mainly deals with fault monitoring and diagnosis. This paper applies reliability theories and methodologies for the fault management of an aeronautical communication system developed within the EU FP7 SANDRA project. The failure of the SANDRA terminal demonstrator is an undesirable event and the corresponding fault tree was built upon a reliability function analysis and was used to quickly monitor failures in the system. By using Monte Carlo simulations, the SANDRA demonstrator's reliability can be predicted and important components, which have major contributions to system failures, can be identified. The results can be used to improve the system reliability by adding parallel components in weak and important places. / Fault management is one of the important management functions of a telecommunication network and mainly deals with fault monitoring and diagnosis. This paper applies reliability theories and methodologies for the fault management of an aeronautical communication system developed within the EU FP7 SANDRA project. The failure of the SANDRA terminal demonstrator is an undesirable event and the corresponding fault tree was built upon a reliability function analysis and was used to quickly monitor failures in the system. By using Monte Carlo simulations, the SANDRA demonstrator's reliability can be predicted and important components, which have major contributions to system failures, can be identified. The results can be used to improve the system reliability by adding parallel components in weak and important places.

<p>Although traditional hazard analysis techniques, such as failure modes and effect analysis (FMEA), and fault tree analysis (FTA) have been used for a long time, they are not well-suited to handling modern systems with complex software, human-machine interactions, and decision-making procedures. This is mainly because traditional hazard analysis techniques rely on a direct cause-effect chain and have no unified guidance to lead the hazard analysis. The Systems Theoretic Accident Model and Process (STAMP) is based on systems theory to try to find out as much as possible about the factors involved in a hazard, and with providing clear guidance as to the control structure leading to the hazard.</p> <p>The Darlington Nuclear Power Generating Station was the first nuclear plant in the world in which the safety shutdown systems are computer controlled. Although FTA and FMEA have already been applied to these shutdown systems, Ontario power generation felt that it is still useful to try recent advances to evaluate whether they can improve on the previous hazard analysis.</p> <p>This thesis introduces the two most common traditional techniques of hazard analysis, FTA and FMEA, as well as two systemic techniques, STPA (which is a hazard analysis method associated with STAMP), and the Functional Resonance Accident Model (FRAM). The thesis also explains why we chose STPA to apply to the Darlington Shutdown System case, and provides an example of the application as well as an evaluation of its use compared with FMEA and FTA.</p> / Master of Applied Science (MASc)