On Seismic Response of Substation Equipment and Application of Base Isolation to Transformers

Saadeghvaziri, M. Ala; Feizi, B.; Kempner, Leon; Alston, D.

doi:10.1109/tpwrd.2009.2033971

Cited by 45 publications

(21 citation statements)

References 5 publications

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“…Because of the great extent of damage to equipment and structures observed after recent earthquakes, substations are often considered to be the most vulnerable components in a power grid . The seismic performance of individual pieces of equipment and structures has recently undergone extensive study, and some modern techniques have been developed and applied to improve their seismic performance . Nevertheless, the seismic reliability of the entire substation system remains unclear because of its high degree of redundancy and physical interaction.…”

Section: Introductionmentioning

confidence: 99%

“…4 The seismic performance of individual pieces of equipment and structures has recently undergone extensive study, [5][6][7][8][9][10] and some modern techniques have been developed and applied to improve their seismic performance. [11][12][13] Nevertheless, the seismic reliability of the entire substation system remains unclear because of its high degree of redundancy and physical interaction.…”

Section: Introductionmentioning

confidence: 99%

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Probability‐based seismic reliability assessment method for substation systems

Li¹,

Wang²,

Shang³

2018

Earthq Engng Struct Dyn

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Summary Power systems play a key role in emergency rescue after an earthquake. Substations are among the most important components of a power system, so it is necessary to study their seismic reliability after an earthquake. Most studies, however, have focused on the seismic behavior of major electrical equipment or the reliability of the substation under ordinary operational conditions. The seismic reliability of substations as a system has not been thoroughly studied. This study proposes a new probability‐based method to evaluate the seismic reliability of complex engineering systems such as substations. The proposed method developed the state tree to construct a greatly simplified system model that enables the failure probability to be calculated for the whole system, with explicit consideration of correlations among various components. A typical 220/110/10‐kV substation was studied with this method, and the most critical components were identified.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Probability‐based seismic reliability assessment method for substation systems

Li¹,

Wang²,

Shang³

2018

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

show abstract

“…The effectiveness of the friction pendulum systems (FPS) in mitigating the seismic responses of the transformer‐bushing system was investigated. It revealed that the base isolation reduced the inertia forces about 85% for the transformer and at least 50% and as high as 95% for the bushing . The seismic reduction of the wire rope isolators and the FPS were also compared.…”

Section: Introductionmentioning

confidence: 99%

“…It revealed that the base isolation reduced the inertia forces about 85% for the transformer and at least 50% and as high as 95% for the bushing. [12] The seismic reduction of the wire rope isolators and the FPS were also compared. The testing results indicated that the wire rope isolators would reduce the maximum acceleration by 30% and the force by 20%, whereas the FPS did by 60% and 70%.…”

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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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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“…Kong compared the effectiveness of the WRI and the FPS for seismic mitigation of bushings and concluded that the WRI would reduce the maximum acceleration by 30% and the force by 20% whereas the FPS did by 60% and 70%, separately. Ala Saadeghvaziri and Feizi also numerically investigated the efficiency of the FPS for seismic reduction of transformer‐bushing system. The results indicated that the inertia forces could be reduced about 85% for the transformer and at least 50% and as high as 95% for 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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On Seismic Response of Substation Equipment and Application of Base Isolation to Transformers

Cited by 45 publications

References 5 publications

Probability‐based seismic reliability assessment method for substation systems

Probability‐based seismic reliability assessment method for substation systems

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

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

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