Considering seismic interaction effects in designing steel supporting structure for surge arrester

Li, Sheng; Tsang, Hing‐Ho; Cheng, Yong; Lü, Zhicheng

doi:10.1016/j.jcsr.2017.01.012

Cited by 35 publications

(8 citation statements)

References 20 publications

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“…The aspect ratio of pole-type structures typically ranges from 1:10 to 1:20. According to previous experimental research [12], pole-type electrical equipment primarily experiences bending loads during seismic events, leading to significant tensile stress at the base. Consequently, implementing base shear isolation becomes challenging.…”

Section: Conceptual Developmentmentioning

confidence: 99%

“…Given their brittle nature, substantial weight, and tall, slender profiles, the seismic resilience of pole-type cylindrical electrical equipment is compromised. Various types of pole-type electrical equipment, such as transformer bushings [10,11], surge arresters [12], capacitor voltage transformers [13], and post insulators [14,15], have been observed to be damaged during major earthquakes in recent decades [16][17][18][19], adversely affecting essential power supplies in the aftermath of these earthquakes [20][21][22]. Figure 1b illustrates the extensive damage to porcelain cylindrical electrical equipment during the 2008 Wenchuan earthquake.…”

Section: Introductionmentioning

confidence: 99%

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Seismic Isolation of Fragile Pole-Type Structures by Rocking with Base Restraints

Li,

Hu,

et al. 2024

Buildings

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Pole-type structures are vulnerable to earthquake events due to their slender shapes, particularly porcelain cylindrical equipment in electrical substations, which has inherent fragility and low strength in its materials. Traditional base isolation designs configure the bottom of the pole-type equipment as hinges with restraints. It fully relies on the restrainers to re-center the pole-type equipment, posing a risk of tilting and functionality failure after earthquakes. This study proposes a solution to this challenge by introducing a restrained rocking mechanism at the base of the structure. The design leverages the self-centering nature of rocking motion and uses restrainers to control the amplitude of rotation. Hence, it can effectively avoid tilting of the pole-type structures after earthquakes. Experimental investigations conducted on a 1:1 full-scale specimen revealed that the proposed restrained rocking design can achieve a reduction in seismic internal forces of over 50% while maintaining equipment in an upright position. Furthermore, an analytical model for the proposed isolation system of pole structures was developed and validated through comparison with experimental results. This paper introduces a novel solution for seismic isolation of pole-type structures through restrained rocking, specifically addressing the research gap regarding a reliable self-centering mechanism under seismic excitation. This advancement significantly enhances the seismic resilience of fragile pole-type structures and provides practical design methodologies for the seismic isolation of slender structures.

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Section: Conceptual Developmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Seismic Isolation of Fragile Pole-Type Structures by Rocking with Base Restraints

Li,

Hu,

et al. 2024

Buildings

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“…The Landers time history recorded in 1992 was modulated to match the required response spectra (RRS) for any type of soil profile in the Chinese GB 50260 standard and Q/GDW 11132-2013 standard (MOHURD 2013, State Grid Corporation of China (SGCC) 2014). The modulated Landers time histories are always adopted in the seismic analyses and tests for UHV electrical equipment in China (Li et al 2017, 2018, Ma et al 2018, Xie et al 2016, 2017). The ARS of the modulated Landers earthquake ground motion could also accommodate the RRS in the earthquake safety evaluation report (YEEII 2014).…”

Section: Test Procedures and Instrumentationmentioning

confidence: 99%

Seismic Evaluation of Ultra-High Voltage Wall Bushing

Xie

Zhou

2019

Earthquake Spectra

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A series of shaking table tests were carried out on a full-size polymer ultrahigh voltage wall bushing. In addition, a corresponding finite element model of the wall bushing was established. Four different earthquake ground motions—the El Centro, modulated Landers, Taft, and an artificial earthquake acceleration time history—were adopted in the study. Test results indicate that the safety factor of the wall bushing is less than the stipulated value of 1.67 in the Chinese code under the peak ground acceleration (PGA) of 2 × 0.4 g, where the factor 2 is used to simulate the amplification effect of the valve hall on the seismic responses of the wall bushing. Necessary slackness should be allowed for the conductors connected to the wall bushing because of the large displacement of the bushing terminals. There are relative displacements between the central conductor and polymer insulators during an earthquake. Increasing the out-of-plane stiffness of sealing plates at the terminals of the wall bushing could decrease the relative displacements. Moreover, a theoretical vibration model of the wall bushing was developed to demonstrate that the rocking effects of the installation plate and flange bottom plate have an influence on the seismic responses of the wall bushing.

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“…Sun et al [13] conducted a shaking table test on a 1100 kV UHV bushing and obtained the acceleration and stress responses at the most unfavorable position of the casing. Li et al [14,15] studied the seismic response of surge arresters by considering the influence of the interaction of 220, 500, 750, and 1000 kV ceramic surge arresters with steel supporting structures. Jean-Bernard et al [16] proposed a simple and practical method for estimating the expected displacement of the interconnection points of substation equipment under earthquake action.…”

Section: Introductionmentioning

confidence: 99%

Seismic Response Analysis of High-Voltage Bushings and Down Lead Transmission Line Systems in Substations

Zhang

Wei

et al. 2022

Applied Sciences

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Based on an actual ultra-high voltage (UHV) substation, a finite element (FE) model for a high-voltage (HV) bushing, arrester, and down lead transmission line (DLTL) system was built using ANSYS software. The dynamic responses of the system under different seismic intensities were analyzed and compared with those of the corresponding single bushing and arrester. On this basis, the coupling vibration influence of the upper DLTL on the responses of the HV bushing and arrester is discussed. The results indicate that the DLTL adversely affects the responses of the HV bushing and arrester under seismic loading. As the seismic intensity increases, the structural displacements at the top of the HV bushing and arrester increase, accompanied by a reduction in the geometric length redundancy of the DLTL, resulting in a mutual pulling effect between the HV bushing and the arrester and the quick amplification of their respective dynamic responses in a nonlinear form. Under the action of an earthquake with a peak ground acceleration (PGA) of 0.4 g, the maximum stresses at the roots of the HV bushing and the arrester in the system separately increase by approximately 13.02% and 7.80% compared to the corresponding single HV bushing and the arrester. Overall, a geometric length redundancy of at least 200 mm in the DLTL in engineering design is recommended.

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Considering seismic interaction effects in designing steel supporting structure for surge arrester

Cited by 35 publications

References 20 publications

Seismic Isolation of Fragile Pole-Type Structures by Rocking with Base Restraints

Seismic Isolation of Fragile Pole-Type Structures by Rocking with Base Restraints

Seismic Evaluation of Ultra-High Voltage Wall Bushing

Seismic Response Analysis of High-Voltage Bushings and Down Lead Transmission Line Systems in Substations

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