Influence of flexible conductors on the seismic responses of interconnected electrical equipment

Linear-elastic analysis of seismic responses of porcelain post electrical equipment

Engineering Structures ◽

10.1016/j.engstruct.2019.109848 ◽

2019 ◽

Vol 201 ◽

pp. 109848 ◽

Cited By ~ 1

Author(s):

Qiang Xie ◽

Chang He ◽

Bin Jiang ◽

Zhenyu Yang

Keyword(s):

Electrical Equipment ◽

Elastic Analysis ◽

Seismic Responses ◽

Linear Elastic

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On the Nonlinear Seismic Responses of Shock Absorber-Equipped Porcelain Electrical Components

Mathematical Problems in Engineering ◽

10.1155/2020/9026804 ◽

2020 ◽

Vol 2020 ◽

pp. 1-15

Author(s):

Zhubing Zhu ◽

Lingxin Zhang ◽

Yongfeng Cheng ◽

Hulun Guo ◽

Zhicheng Lu

Keyword(s):

Electrical Equipment ◽

Shaking Table ◽

Displacement Curve ◽

Seismic Responses ◽

Shock Absorption ◽

Seismic Effects ◽

Nonlinear Characteristics ◽

Shock Absorbers ◽

Shaking Table Testing ◽

Electrical Components

Porcelain electrical equipment is prone to brittle failure due to resonance under seismic effects. To improve its seismic resistance, some researchers have conducted research on shock absorption technology for porcelain electrical equipment. However, extant research fails to provide a detailed and systematic study of the effect of the nonlinear characteristics of these shock absorbers on the performance of equipment under seismic effects. This paper provides a theoretical analysis, verified by shaking table testing, of the performance of a 1000 kV pillar-type porcelain lightning arrester. The Bouc–Wen model is fitted to the force-displacement curve of hysteretic nonlinear metal shock absorbers, and a dynamic model of, and equations for, pillar-type porcelain electrical components are derived, taking into account their nonlinear characteristics. This reveals the influence of the nonlinear characteristics of shock absorbers on the nonlinear seismic response characteristics of these components. Our results indicate that the seismic responses of pillar-type porcelain components can be effectively suppressed by hysteretic nonlinear shock absorbers and that the greater the intensity of the seismic waves, the more obvious the efficiency of shock absorption. However, as the installation radius and yield force of the installed shock absorbers increase, their shock absorption efficiency gradually decreases.

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Seismic responses of bundled conductor interconnected electrical equipment

Structures ◽

10.1016/j.istruc.2021.05.092 ◽

2021 ◽

Vol 33 ◽

pp. 3107-3121

Author(s):

Chang He ◽

Miaomiao Wei ◽

Qiang Xie ◽

Lizhong Jiang

Keyword(s):

Electrical Equipment ◽

Seismic Responses

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Application of Tuned Mass Damper to Mitigation of the Seismic Responses of Electrical Equipment in Nuclear Power Plants

Energies ◽

10.3390/en13020427 ◽

2020 ◽

Vol 13 (2) ◽

pp. 427 ◽

Cited By ~ 3

Author(s):

Sung Gook Cho ◽

Seongkyu Chang ◽

Deokyong Sung

Keyword(s):

Nuclear Power ◽

Power Plants ◽

Shaking Table Test ◽

Response Spectrum ◽

Electrical Equipment ◽

Optimization Method ◽

Tuned Mass Damper ◽

Shaking Table ◽

Seismic Responses ◽

Mass Damper

A tuned mass damper (TMD) was developed for mitigating the seismic responses of electrical equipment inside nuclear power plants (NPPs), in particular, the response of an electrical cabinet. A shaking table test was performed, and the frequency and damping ratio were extracted, to confirm the dynamics of the cabinet. Electrical cabinets with and without TMDs were modeled while using SAP2000 software (Version 20, Computers and Structures, NY, USA) that was based on the results. TMDs were designed while using an optimization method and the equations of Den Hartog, Warburton, and Sadek. The numerical models were verified while using the shaking table test results. A sinusoidal sweep wave was applied as input to identify the vibration characteristics of the electrical cabinet over a wide frequency range. Applying various seismic loads that were adjusted to meet the RG 1.60 design response spectrum of 0.3 g then validated the control performance of the TMD. The minimum and maximum response spectrum reduction rates of the designed TMDs were 44.7% and 62.9%, respectively. Further, the amplification factor of the electrical cabinet with the TMD was decreased by 53%, on average, with the proposed optimization method. In conclusion, TMDs can be considered to be an effective way of enhancing the seismic performance of the electrical equipment inside NPPs.

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