Seismic Response of Transformer-Bushing Systems

Ersoy, Selahattin; Saadeghvaziri, M. Ala

doi:10.1109/tpwrd.2003.820215

Cited by 47 publications

(13 citation statements)

References 4 publications

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“…In the last 20 years, many studies had been done to qualify the seismic behavior of bushings and to raise their reliability. The additional flexural stiffeners on the cover plate were beneficial to the seismic response of the bushing, because it increased the fundamental frequency of the bushing close to that of rigid base condition . Considering the additional stiffeners, the maximum reduction in bending moment at the base of bushing was achieved in a range of 53% to 86% compared with the flexible cover plate .…”

Section: Introductionmentioning

confidence: 99%

“…The additional flexural stiffeners on the cover plate were beneficial to the seismic response of the bushing, because it increased the fundamental frequency of the bushing close to that of rigid base condition. [8,9] Considering the additional stiffeners, the maximum reduction in bending moment at the base of bushing was achieved in a range of 53% to 86% compared with the flexible cover plate. [10] In addition, there are also many other methods used to mitigate the seismic responses of the bushing.…”

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confidence: 99%

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Sloshing characteristics of annular tuned liquid damper (ATLD) for applications in composite bushings

Yue

Chen

2018

Struct Control Health Monit

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Summary It is of great significance to conduct seismic qualification and mitigation for composite bushing, whose damage may cause massive power outage and huge cost of repair. In this paper, the annular tuned liquid damper (ATLD), utilizing the sloshing characteristics of transformer oil in the dome, is proposed to reduce the seismic responses of the composite bushing. As to the annular feature of the metallic dome, the simplified formulas for calculating the liquid sloshing frequencies in the dome are derived based on the linear wave theory, which provides a direct and fast way for the predesign of ATLD. Comparing with the experimental results reported in literature, the accuracy and applicability of the proposed formulas are verified. In addition, parametric studies of the first 3 sloshing frequencies including liquid height and the outer and the inner radii are carried out. The optimal tuning analysis of vibration reduction in frequency domain is performed on the structure base excitation. The vibration reduction analyses in time domain of the ATLD for the composite bushing subjected to real earthquake records are carried out and discussed simultaneously. It is shown that the simplified formulas presented in this paper provide a convenience for the predesign of ATLD and the optimal ATLD is effective in reducing the vibration of the composite bushing.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Sloshing characteristics of annular tuned liquid damper (ATLD) for applications in composite bushings

Yue

Chen

2018

Struct Control Health Monit

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“…Filiatrault and Matt (2006) Rocking response and overturning of equipment Makris and Roussos (1998); Makris and Zhang (1999) Rigid electrical equipment anchored to a base foundation (e.g., transformer) Black (2001, 2002) Electrical substation equipment connected by nonlinear rigid bus conductors Song et al (2007) Whittaker et al (2004) The previous vulnerability studies showed that the analytical and experimental works are undertaken for a particular failure mode. Song et al (2007) and Hong et al (2001) worked on the response of cable connected equipment; Ersoy and Saadeghvaziri (2004) worked on seismic interaction of transformer and bushing system; Makris and Roussos (1998) and 1994 was used to develop these fragility curves. Anagnos (1999) did not consider the statistical dependence among the observations while estimating the equipment fragilities.…”

Section: Previous Vulnerability Studies On Substationmentioning

confidence: 99%

Seismic risk assessment of high-voltage transformers using Bayesian belief networks

Siraj

Tesfamariam

Dueñas‐Osorio

2014

Structure and Infrastructure Engineering

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“…To get a better understanding of the dynamic characteristics of the bushings, the finite element method (FEM) was also adopted. Ersoy and Saadeghvaziri investigated the influences of the flexibility of the transformer's top plate on the dynamic responses of the bushing in SAP2000. Koliou provided the fragility curves of bushings with different mounted conditions and concluded that the additional stiffeners on the top plate of the transformer would be one of the most efficient retrofit approaches for reducing the bending moment at the base of the bushing Moreover, many/more techniques such as the additional stiffener, the increased preload, and the stiffer gaskets were also adopted to enhance the mounted conditions of the bushings, which would reduce the input motions at the base of the bushing.…”

Section: Introductionmentioning

confidence: 99%

Optimal design of multiple annular tuned liquid dampers for seismic reduction of 1,100-kV composite bushing

Yue

Chen

2019

Struct Control Health Monit

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Summary It is of great significance to perform seismic mitigation for the 1,100‐kV composite bushings because they are vulnerable to damage during earthquakes. In this paper, a new design process of multiple tuned liquid dampers (MTLDs), utilizing the displacement transfer function curves and the equivalent mechanical model of annular tuned liquid damper (ATLD), is proposed for seismic reduction of the 1,100‐kV composite bushing. At first, the equivalent mechanical model of ATLD is derived based on the linear wave theory. The effects of the radius ratio and the liquid‐filled depth ratio on the equivalent sloshing mass are discussed. The accuracy of the equivalent mechanical model is also verified by comparing the results with those from the Housner's model and the finite element model. And then, the transfer functions of the structure with MATLD attached are formulated in the frequency domain. The parameters, including the frequency ratio, the mass ratio, and the damping ratio, that influence the transfer function curves are also investigated. Based on these transfer function curves, the new design process of MATLD is presented. Combining with the equivalent mechanical model of ATLD, a dynamic analysis of the bushing equipped with MATLD in the dome is performed under the real earthquake records. It is concluded that the MATLD performs better than the ATLD and the bushing equipped with 5ATLD in the dome is the optimal design for seismic reduction.

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Seismic Response of Transformer-Bushing Systems

Cited by 47 publications

References 4 publications

Sloshing characteristics of annular tuned liquid damper (ATLD) for applications in composite bushings

Sloshing characteristics of annular tuned liquid damper (ATLD) for applications in composite bushings

Seismic risk assessment of high-voltage transformers using Bayesian belief networks

Optimal design of multiple annular tuned liquid dampers for seismic reduction of 1,100-kV composite bushing

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