Modeling and Seismic Performance Evaluation of High Voltage Transformers and Bushings

Download or read book Modeling and Seismic Performance Evaluation of High Voltage Transformers and Bushings written by Andrei M. Reinhorn and published by . This book was released on 2011 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In this study, existing transformers are modeled to explore the effects of modeling variations and structural modifications that could impact the response of bushings mounted on the transformer covers. A model was developed to identify the dynamic characteristics of the transformer and the significant interactions between various components and the high voltage bushings. A number of structural modifications were introduced to observe the sensitivity of the responses of the bushings when mounted on different transformer models. Each model was investigated using modal and spectral analyses, using random and spectrum compatible (IEE 693-2005) ground motion. The responses were measured at the top of bushings, the corners of the cover plate and the base of the turrets. Furthermore, the spectra at the corners of the cover plate and at the base of the turrets were obtained and associated with the bushings' response. The transformer was also analyzed for vacuum pressure, to determine the most adverse displacement condition for the interconnected interior cables. Finally, simplified models were explored in which the cover plate, along with its stiffeners and the bushings, was separated from the transformer. Various boundary conditions were examined in an effort to determine the degrees of approximation of bushings' response with respect to the response obtained from the full transformer model. Recommendations for guidelines on modeling transformers and bushings can be derived from this work"--Pages iii-iv.