TY - JOUR
T1 - On seismic response of substation equipment and application of base isolation to transformers
AU - Saadeghvaziri, M. Ala
AU - Feizi, B.
AU - Kempner, L.
AU - Alston, D.
N1 - Funding Information:
Manuscript received December 16, 2009. First published December 04, 2009; current version published December 23, 2009. This work was supported by The National Science Foundation under the Multidisciplinary Center for Earthquake Engineering Research (MCEER) program. The results and conclusions are those of the authors and do not necessarily reflect the views of the sponsors. Paper no. TPWRD-00513-2007.
PY - 2010/1
Y1 - 2010/1
N2 - This paper presents seismic performance of electric substation transformers, and discusses advantages and considerations in the use of base isolation as a viable hazard mitigation option. Substation transformers and bushings are the most critical elements within the power delivery system and their performances during past earthquakes in the U.S. and abroad have not been satisfactory. Finite-element analyses indicate that the interaction between these two critical elements has a significant effect on seismic vulnerability of substations. In light of dynamic characteristics of this equipment, base isolation can be very effective in mitigating this adverse interaction. Furthermore, due to high-inertia reduction, base isolation can also have beneficial effects on the long-term longevity of transformers and on foundation performance during seismic events. Larger displacement demand and uplift, however, are issues that must be considered in the application of base isolation. Through an actual case study (433.3-MVA transformer in a high-voltage substation), a simplified model of the transformer bushing will be developed and the results of fixed base case and base isolated case are compared. Moreover, design concepts will be investigated that will demonstrate larger displacement can be accommodated; and that considering transformer geometry, peak ground acceleration, amount of inertia reduction, and isolator's friction coefficient for this transformer uplift is not an issue.
AB - This paper presents seismic performance of electric substation transformers, and discusses advantages and considerations in the use of base isolation as a viable hazard mitigation option. Substation transformers and bushings are the most critical elements within the power delivery system and their performances during past earthquakes in the U.S. and abroad have not been satisfactory. Finite-element analyses indicate that the interaction between these two critical elements has a significant effect on seismic vulnerability of substations. In light of dynamic characteristics of this equipment, base isolation can be very effective in mitigating this adverse interaction. Furthermore, due to high-inertia reduction, base isolation can also have beneficial effects on the long-term longevity of transformers and on foundation performance during seismic events. Larger displacement demand and uplift, however, are issues that must be considered in the application of base isolation. Through an actual case study (433.3-MVA transformer in a high-voltage substation), a simplified model of the transformer bushing will be developed and the results of fixed base case and base isolated case are compared. Moreover, design concepts will be investigated that will demonstrate larger displacement can be accommodated; and that considering transformer geometry, peak ground acceleration, amount of inertia reduction, and isolator's friction coefficient for this transformer uplift is not an issue.
KW - Base isolation
KW - Bushings
KW - Power substations
KW - Seismic response
KW - Transformers
UR - http://www.scopus.com/inward/record.url?scp=73849140505&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=73849140505&partnerID=8YFLogxK
U2 - 10.1109/TPWRD.2009.2033971
DO - 10.1109/TPWRD.2009.2033971
M3 - Article
AN - SCOPUS:73849140505
SN - 0885-8977
VL - 25
SP - 177
EP - 186
JO - IEEE Transactions on Power Delivery
JF - IEEE Transactions on Power Delivery
IS - 1
M1 - 5345686
ER -