Seismic performance enhancement of high-voltage post insulators by a polyurethane spring isolation device

Gökçe, Tansu; Yüksel, Ercan; Orakdogen, Engin

doi:10.1007/s10518-018-0494-6

Cited by 9 publications

(6 citation statements)

References 14 publications

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“…The GEO-1 and GEO-2 devices were subsequently positioned between the steel support and 550 kV HV porcelain post insulator. Gökçe et al (2019) gives full description of the fixed connection between the porcelain insulator and steel support.…”

Section: The Seismic Isolation Device and The Performance Testsmentioning

confidence: 99%

“…Although preliminary comparisons between the fixed base and GEO-1 design was achieved for five tests in Gökçe et al (2019), this article presents the results of ten tests.…”

Section: The Seismic Isolation Device and The Performance Testsmentioning

confidence: 99%

“…The parameters used to characterize the axial response of polyurethane springs are yield strength ( F y = 13.5 kN), yield displacement (Δ y = 7.813 mm), and the Ramberg–Osgood coefficient ( α = 1.5 and α = 1.2 for GEO-1 and GEO-2, respectively). The values chosen for shear resistance of the polyurethane springs were based on experimental observations, which yielded relatively high values when compared to the axial stiffness (Gökçe et al, 2019).…”

Section: Numerical Modeling and The Fragility Curvesmentioning

confidence: 99%

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Improvement of the polyurethane spring isolation device for HV post insulators and its evaluation by fragility curves

2021

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A novel seismic base isolation system has been developed for high-voltage (HV) porcelain post insulators. The seismic isolation device consists of two steel plates, four polyurethane springs, and a steel rod, which are low-cost components compared to the post insulators. Two alternative designs of the device are experimentally and numerically assessed in this article. A simple and robust numerical model consisting of linear line elements and nonlinear springs was generated, and subsequently validated using the experimental results. Incremental dynamic analyses (IDAs) were then performed to obtain fragility curves. Ten historical earthquake profiles, scaled to intensities between 0.1 and 2.0 g, were then applied to the numerical models. The fragility curves, generated according to the latest version of IEEE-693, demonstrate that the seismic isolation devices are highly effective in diminishing the base moment of the porcelain insulator. It should be noted that relatively large displacements at the top of the pole must be accounted for by ensuring adequate slackness in the flexible conductors.

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Section: The Seismic Isolation Device and The Performance Testsmentioning

confidence: 99%

“…Although preliminary comparisons between the fixed base and GEO-1 design was achieved for five tests in Gökçe et al (2019), this article presents the results of ten tests.…”

Section: The Seismic Isolation Device and The Performance Testsmentioning

confidence: 99%

Section: Numerical Modeling and The Fragility Curvesmentioning

confidence: 99%

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Improvement of the polyurethane spring isolation device for HV post insulators and its evaluation by fragility curves

2021

Self Cite

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“…Therefore, studies on elastomeric polymers, such as polyurethane, that exhibit similar performance while being more economical and workable than SMA are being actively conducted. In this way, elastomeric polymers, such as polyurethane springs, can be used in structural damper systems that offer not only self-centering but also vibration control [19,20].…”

Section: Introductionmentioning

confidence: 99%

“…Migda et al [29] revealed that polyurethane foam increased the rigidity of buildings, resulting in the mitigation of the inelastic response of the structure subjected to different seismic excitations. Gökçe et al [20] evaluated the seismic performance of high-voltage post insulators by using the polyurethane bearing system through a shaking table. The test results indicated that polyurethane bearing systems could help to enhance the seismic safety of the post insulators by providing additional stiffness.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Behavior of Polyurethane Springs for Compression Members

2021

Applied Sciences

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In this study, the characteristics of the compression behavior of polyurethane springs that can be used as compression members of seismic devices, such as dampers and seismic isolators, were identified, and the effect of the design variables on the performance points of polyurethane springs was investigated. Compressive stiffness and specimen size were set as the design variables of the polyurethane spring, and the performance indicators were set as maximum force, residual strain, and energy dissipation. A total of 40 specimens with different conditions were fabricated and a cyclic loading test was performed to obtain the force-displacement curve of the polyurethane spring and to check the performance indicator. Significant strength degradation was confirmed after the first cycle by repeated loading, and it was confirmed that compressive stiffness and size demonstrated a linear proportional relationship with maximum force. In addition, the design variables did not make a significant change to the recovered strain, including residual strain, and residual strain of about 1% to 3% occurred. Energy dissipation showed a tendency to decrease by about 60% with strength degradation after the first cycle, and this also demonstrated no relationship with the design variables. Finally, the relationship between the design variables and performance indicators set in this study was reviewed and suggestions are presented for developing a simple design formula for polyurethane springs.

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Seismic risk analysis of electrical substations based on the network analysis method

Liang

Blagojević

Xie

et al. 2022

Earthq Engng Struct Dyn

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Electrical substations are critical elements of a power grid, enabling the transmission and distribution of electric power from power generators to the end‐users. Experiences from previous earthquakes have shown that electrical substations can be damaged due to ground shaking, reducing their functionality and potentially preventing the generated electric power from reaching end‐users. To assess the seismic vulnerability of a substation, a modular quantitative assessment method is proposed. In this method, the relation between the functionality state of a substation and the damage state of its components was established through the connection matrix technique. A substation is viewed as a network system, whose topology is defined by the connections among various pieces of electrical equipment (i.e., the components), represented in the connection matrix. The maximum allowable power transmission capacity of the substation after an earthquake is adopted as the system functionality metric, which is jointly determined by the power input, transform, and output capacity of the substation. The seismic vulnerability of an electrical substation is quantified by probabilistically calculating its postearthquake functionality when exposed to various earthquake intensities using Monte Carlo sampling. Finally, the risk of substation functionality loss is quantified by integrating the seismic hazard curve with the seismic vulnerability model of the substation. Two realistic case studies on a distribution substation and a transmission substation, with the same equipment configuration but different power delivery paths, were performed using the proposed method. Furthermore, a sensitivity analysis regarding the equipment fragility parameters is conducted, providing a risk‐informed basis for improving the seismic performance of the substation system.

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Seismic performance enhancement of high-voltage post insulators by a polyurethane spring isolation device

Cited by 9 publications

References 14 publications

Improvement of the polyurethane spring isolation device for HV post insulators and its evaluation by fragility curves

Improvement of the polyurethane spring isolation device for HV post insulators and its evaluation by fragility curves

Experimental Study on the Behavior of Polyurethane Springs for Compression Members

Seismic risk analysis of electrical substations based on the network analysis method

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