Earthquake simulator testing of base-isolated power transformers

This paper presents a comprehensive study involving triaxial earthquake simulator testing on seismic isolation of electric power transformers. In this study, two isolation systems were developed: one using sliding bearings combined with rubber bearings and the other segmented high-damping rubber bea...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2006-07, Vol.21 (3), p.1291-1299
Main Authors: Murota, N., Feng, M.Q., Gee Yu Liu
Format: Article
Language:English
Subjects:
Acceleration
Applied sciences
Base isolation
Bearings
bushing
Bushings
earthquake simulator
Earthquakes
Electric power generation
electric power transformer
Electrical engineering. Electrical power engineering
Electrical power engineering
Exact sciences and technology
Friction
Insulators
Isolation systems
Large-scale systems
Miscellaneous
Performance evaluation
Power electronics, power supplies
Power networks and lines
Power system modeling
Power transformers
Rubber
seismic
Seismic engineering
Seismic phenomena
Sliding
Studies
Substations
Testing
Transformers
Transformers and inductors
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Summary:This paper presents a comprehensive study involving triaxial earthquake simulator testing on seismic isolation of electric power transformers. In this study, two isolation systems were developed: one using sliding bearings combined with rubber bearings and the other segmented high-damping rubber bearings. Triaxial earthquake simulator testing was performed using a large-scale transformer model equipped with a real bushing. The effectiveness of the base isolation system in reducing the response acceleration of power transformer systems was demonstrated. Important observations were made on the seismic responses of the transformer and bushing. In particular, the vertical component of the ground motion induced a high-frequency response of the bushing when the transformer was isolated with the sliding isolation system. This is because the vertical motion changes the friction forces in the sliding bearings that excite high modes in the transformer-bushing system. Furthermore, the effect of the interaction with the bushing connecting cables on the response of the bushing in the base-isolated system was experimentally evaluated. In conclusion, the base isolation technology, when properly designed, is a highly effective measure for seismic protection of power transformers.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2006.874586