Seismic performance evaluation and improvement of ultra-high voltage wall bushing-valve hall system

He, Chang; Xie, Qiang; Yang, Zhenyu; Xue, Songtao

doi:10.1016/j.jcsr.2018.11.016

Cited by 25 publications

(11 citation statements)

References 12 publications

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“…Because of the weight capacity limitation and the shaking table's overturning moment, the valve hall supporting the wall bushing was replaced by a steel supporting frame. The amplification effect of the valve hall's gable wall on the seismic responses of the wall bushing was considered by multiplying the input ground motions by an amplification factor of 2 (He et al 2019). Before the test, the resonance frequencies of the supporting frame were investigated by FE analysis.…”

Section: Supporting Framementioning

confidence: 99%

“…According to the Chinese GB 50260 standard (MOHURD 2013), the target peak ground acceleration (PGA) of the test should be 0.4 g. The FE model of the UHV wall bushing-valve hall system has been established in our previous research. The interaction between the wall bushing and valve hall and the amplification effect has been analyzed (He et al 2019). In this UHV direct current project, after the seismic design of the valve hall, the stress amplification factor was less than 2, which means that the amplification factor of the valve hall to the wall bushing can be set as 2 (He et al 2019).…”

Section: Test Procedures and Instrumentationmentioning

confidence: 99%

“…The interaction between the wall bushing and valve hall and the amplification effect has been analyzed (He et al 2019). In this UHV direct current project, after the seismic design of the valve hall, the stress amplification factor was less than 2, which means that the amplification factor of the valve hall to the wall bushing can be set as 2 (He et al 2019). In the shaking table tests, an amplification factor of 2.0 was adopted, which meant the maximum target PGA was 0.8 g. The natural earthquake ground motions were scaled, and the influence on the high frequencies and noises was ignored.…”

Section: Test Procedures and Instrumentationmentioning

confidence: 99%

“…In our previous research, the amplification factor of 2 was enough to evaluate the strength of the wall bushing. However, the acceleration response spectra (ARS) of the valve hall close to its fundamental frequency was larger than the twofold amplified input ARS (He et al 2019). In future studies, the amplification effect of the valve hall should be further investigated.…”

Section: Introductionmentioning

confidence: 97%

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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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Section: Supporting Framementioning

confidence: 99%

Section: Test Procedures and Instrumentationmentioning

confidence: 99%

Section: Test Procedures and Instrumentationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Seismic Evaluation of Ultra-High Voltage Wall Bushing

Xie

Zhou

2019

Earthquake Spectra

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“…Nevertheless, little attention has been paid to wall bushings, which play an indispensable role in connecting converter valves inside valve hall buildings with other electric facilities using an outdoor direct current (DC) field (He et al, 2019). The seismic performance of wall bushings is therefore of serious concern and requires further study.…”

Section: Introductionmentioning

confidence: 99%

Seismic performance improvement of ±800 kV UHV DC wall busing using friction ring spring dampers

2020

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Wall bushings that connect converter valves within hall buildings and other electric facilities in a direct current (DC) field are indispensable in substations but vulnerable to earthquakes. A finite element model was developed to evaluate the seismic performance of a real ultra-high-voltage (UHV) DC wall bushing. The numerical results show that the maximum stress of the wall bushing during seismic activity does not satisfy the strength safety factor provisions within Chinese regulations. To improve the seismic performance of the wall bushing, an energy dissipation device composed of eight friction ring spring dampers (FRSDs) was proposed to be installed between the connection plate on which the bushing is mounted and a steel wall frame. In addition, optimum parameters of the FRSDs were researched and determined, then the seismic responses of the wall bushing with and without the FRSDs were compared to evaluate the energy dissipation effects. Full-scale shaking table tests were conducted on a wall bushing with the designed energy dissipation device. The validity of the numerical simulations and effectiveness of the proposed energy dissipation device of the wall bushing were verified by the experimental results in terms of seismic response mitigation.

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