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Probabilistic seismic assessment of seismically isolated electrical transformers considering vertical isolation and vertical ground motion
- Source :
- Engineering Structures. 152:888-900
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- This study presents a probabilistic response analysis of seismically isolated electrical transformers with emphasis on comparing the performance of equipment that are non-isolated to equipment that are isolated only in the horizontal direction or are isolated by a three-dimensional isolation system. The performance is assessed by calculating the probability of failure as function of the seismic intensity with due consideration of: (a) horizontal and vertical ground seismic motions, (b) displacement capacity of the seismic isolation system, (c) limit states of electrical bushings, (d) details of construction of the isolation system, (e) weight of the isolated transformer, and (f) bushing geometry and configuration. Calculations of the probability of failure within the lifetime of isolated and non-isolated transformers at selected locations are also performed. The results of this study demonstrate that seismic isolation systems can improve the seismic performance for a wide range of parameters and that systems which isolate in both the horizontal and vertical directions can be further effective. The seismic assessment methodology presented can be used for: (a) deciding on the need to use seismic isolation and selecting the properties of the isolation system for transformers depending on the design limits, location, and configuration of transformer and (b) calculating the mean annual frequency of functional failure and the corresponding probability of failure over the lifetime of the equipment. The results may also be used to assess the seismic performance of electric transmission networks under scenarios of component failures.
- Subjects :
- Ground motion
021110 strategic, defence & security studies
Engineering
Horizontal and vertical
business.industry
Response analysis
0211 other engineering and technologies
Probabilistic logic
020101 civil engineering
02 engineering and technology
Structural engineering
0201 civil engineering
law.invention
Electric power transmission
Seismic assessment
law
Bushing
business
Transformer
Civil and Structural Engineering
Subjects
Details
- ISSN :
- 01410296
- Volume :
- 152
- Database :
- OpenAIRE
- Journal :
- Engineering Structures
- Accession number :
- edsair.doi...........d8ad7587723a782965ff97d253fb6936