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Publication Date
5-2018
Date of Final Oral Examination (Defense)
3-1-2018
Type of Culminating Activity
Thesis - Boise State University Access Only
Degree Title
Master of Science in Civil Engineering
Department
Civil Engineering
Supervisory Committee Chair
Arvin Farid, Ph.D
Supervisory Committee Member
Yang Lu, Ph.D.
Supervisory Committee Member
Travis Soppe, M.S.
Abstract
In seismic zones, the electrical grid is at risk due to the vulnerability of large power transformers’ insulating bushings, which can experience dramatic seismic amplification. Identifying cases where this risk exists is critical if we are to mitigate against potentially expensive, extensive, and long-lasting power outages following significant seismic events. This thesis aims to make progress toward developing an improved understanding of the conditions leading to these large amplifications and, thereby, better equip engineers and civil servants to deploy measures aimed at protecting the public. Through dynamic analysis using the finite-element method, five case studies are investigated, which point to several patterns: (i) first, dynamic coupling of transformers and their insulating bushings is a significant concern; (ii) the primary modal-frequency relationship between the transformer tank and its high-voltage bushings affects the recommended design details for minimization of bushing amplifications; and (iii) many large transformer designs are susceptible to excessive amplification of seismic loading to the bushings, and therefore system dynamics should always be considered when evaluating these designs for their seismic withstand capabilities.
DOI
10.18122/td/1368/boisestate
Recommended Citation
Bender, Jonathan, "Predicting Power Transformer Bushings' Seismic Vulnerability" (2018). Boise State University Theses and Dissertations. 1368.
10.18122/td/1368/boisestate