Caracterización del comportamiento mecánico de los elementos estructurales y dieléctricos de las sujeciones de las placas aislantes de transformadores para definir directrices del proceso de fabricación en la empresa Efacec Energía, Máquinas y Equipos Eléctricos S.A.

Proyecto de Graduación (Licenciatura en Ingeniería en Mantenimiento Industrial) Instituto Tecnológico de Costa Rica. Escuela de Ingeniería Electromecánica, 2017.The following project has as aim to characterize the mechanical behavior of the active part elements and the clamping structure system through a mathematical model evaluated during the most critical condition (short-circuit). The short-circuit study in transformer is one of the most complex, additionally, it requires diferent disciplines for its analysis. The general steps for a transformer dynamic study are: 1) the calculation of the short-circuit currents, which is done by IEC-60076-5; 2) the calculation of the electromagnetic forces through the image method and 3) mathematical combined model application for active part and clamping structure in a dynamic analysis. The use of a mathematical model eases and reduces time in the transformer analysis under these conditions. Besides, It allows to analyze the behavior of many critical elements of the system at once. In parallel, some manufacturing guidelines were de ned for bolted joints inside the transformer (critical part, owing to the sensibility of the oil dielectric strength), e.g. the lubrication importance and the torque variations for diferent stages up to 140% for the same force.Instituto Tecnológico de Costa Rica. Efacec, Energíaa. Máquinas y Equipos Eléctricos