Seismic Response and Failure Mechanism of Radiator and Conservator Connections in a 154 kV Transformer Based on Shaking Table Tests
Source abstract
Abstract
Transformers are critical components in power systems, and their functionality must be maintained during seismic events. This study conducted multi-directional shaking table tests on a full-scale 154 kV transformer to investigate the seismic response and failure mechanisms of radiator and conservator connections. Measurements of relative displacement, acceleration, and test response spectra (TRS) indicated stable responses of 0.5–1.2 g for the transformer body, whereas the bushings and radiators exhibited amplified accelerations of up to 4 g and 2 g, respectively, along with relative displacements exceeding 20 mm. Under the 500-year return period input motion, leakage was observed at the lower radiator elbow, which is attributed to the combined effects of concentrated relative displacement, acceleration amplification, frequency-dependent energy concentration, and local structural discontinuities. The observed damage patterns were consistent with leakage incidents reported during the 2024 Noto earthquake in Japan. Based on the experimental findings, this study discusses seismic performance enhancement measures for radiator connections and provides experimental evidence to support the seismic safety evaluation of transformers with similar configurations.
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Research context
OpenAlex topics: Seismic Performance and Analysis · Power Transformer Diagnostics and Insulation · Vibration and Dynamic Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
R&D Strategy Center, KEPCO Research Institute, Daejeon 34057, Republic of Korea
Seismic Research and Test Center, Pusan National University, Busan 46241, Republic of Korea
Department of Architectural and Civil Engineering, Kyungil University, Gyeongsan 38428, Republic of Korea
Funding
Korea Electric Power Corporation
References (23)
Show source-provided references
1. Seismic response of high-voltage transformer–bushing systems10.1061/(ASCE)0733-9445(2006)132:2(287) ↗
2. Seismic response of transformer–bushing systems10.1109/TPWRD.2003.820215 ↗
3. (2005). IEEE Recommended Practice for Seismic Design of Substations (Standard No. IEEE 693-2005).
4. (2016). Bushing Amplification Factors—Guidance (Standard No. IEC TS 61463).
5. (2007). Seismic Qualification for Gas-Insulated Switchgear Assemblies for Rated Voltages Above 52 kV (Standard No. IEC 62271-207).
6. (2013). Seismic Qualification for Metal-Enclosed and Solid-Insulation-Enclosed Switchgear and Controlgear Assemblies for Rated Voltages Above 1 kV and up to and Including 52 kV (Standard No. IEC 62271-210).
7. (1991). Environmental Testing—Part 3: Guidance—Seismic Test Methods for Equipment (Standard No. IEC 60068-3-3).
8. Amir, S.G., Whittaker, A.S., Fenves, G.L., and Fujisaki, E. (1999). Seismic Evaluation of 550 kV Porcelain Transformer Bushings, Pacific Earthquake Engineering Research Center. (PEER Report 1999/05).
9. Koliou, M., Filiatrault, A., and Reinhorn, A.M. (2012). Seismic Protection of Electrical Transformer Bushing System by Stiffening Techniques, Multidisciplinary Center for Earthquake Engineering Research. (Technical Report MCEER-12-0002).
10. Modal identification and seismic performance evaluation of 154 kV transformer porcelain bushing by vibration test10.5000/EESK.2006.10.5.107 ↗
11. Response of a 230 kV outdoor termination according to the frequency characteristics of input seismic waves10.1016/j.egyr.2019.11.109 ↗
12. Ullah, K.N., and Mohammad, A.S. (2015). Electrical and Seismic Design of Electric Supply Substation, LAP Lambert Academic Publishing.
13. Oikonomou, K., Roh, H., Reinhorn, A.M., Schiff, A., and Kempner, L. (2010). Seismic performance evaluation of high-voltage transformer bushings. Proceedings of the Structures Congress 2010, ASCE.10.1061/41130(369)246 ↗
14. Rocking stiffness of mounting arrangements in electrical cabinets and control panels10.1016/S0029-5493(02)00279-0 ↗
15. Experimental seismic response of high-voltage transformer–bushing systems10.1193/1.2044820 ↗
16. Cao, M.G., Cheng, Y.F., Dai, Z.B., Zhou, F.L., and Tan, P. (2012, January 24–28). Parameter analysis and shaking table test on seismic isolation system of transformer with bushings. Proceedings of the 15th World Conference on Earthquake Engineering (WCEE), Lisbon, Portugal.
17. Seismic response evaluation of 154 kV transformer porcelain bushing by shaking table tests
18. Seismic performance evaluation of 500 kV EBA10.5050/KSNVE.2015.25.7.496 ↗
19. Seismic response of high-voltage transformer-bushing systems incorporating flexural stiffeners I: Numerical study10.1193/072511EQS184M ↗
20. Seismic response of high-voltage transformer-bushing systems incorporating flexural stiffeners II: Experimental study10.1193/072511EQS185M ↗
21. Ministry of the Interior and Safety (MOIS) (2017). Common Application of Seismic Design Criteria, MOIS. (In Korean).
22. (2013). Standard for Seismic Qualification of Equipment for Nuclear Power Generating Stations (Standard No. IEEE 344).
23. (2010). Acceptance Criteria for Seismic Certification by Shake-Table Testing of Nonstructural Components (Standard No. Acceptance Criteria 156 (AC156)).