Seismic vulnerability analysis of &plusmn;800 kV converter transformer

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (15) : 244-251.

Seismic vulnerability analysis of ±800 kV converter transformer

LI Xiaoxuan1, XIE Qiang1，2

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Abstract

Converter transformer is a key equipment in the ultra-high voltage (UHV) substation. In order to evaluate its seismic performance and seismic vulnerability, a refined finite element model of an 800kV converter transformer was established in this paper. The seismic response characteristics and seismic failure modes of the transformer were obtained through time-history response analysis. Furthermore, the seismic vulnerability curve was obtained through multiple strip analysis, and the reinforcement measure was proposed to improve seismic performance of the converter transformer. The results show that the fundamental frequency of the valve-side bushing of the converter transformer is less than 1Hz, and it is easy to cause excessive top displacement response under earthquakes. The root stress response result indicates that the seismic vulnerability of line bushing is more significant than that of the valve-side bushing. The vulnerability analysis results show that the failure probability of deformation failure mode is higher than the strength failure mode. A landing bracket was set at the top of the valve-side turrets, where the acceleration amplification factor can be significantly reduced. Considering the dual failure modes of deformation and strength, this reinforcement measure can effectively reduce the failure probability of deformation failure mode.
Key words: converter transformer; Finite element model; Earthquake vulnerability; Multiple stripe analysis; Reinforcement measures

Key words

converter transformer / Finite element model / Earthquake vulnerability / Multiple stripe analysis / Reinforcement measures

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LI Xiaoxuan1, XIE Qiang1，2. Seismic vulnerability analysis of ±800 kV converter transformer[J]. Journal of Vibration and Shock, 2022, 41(15): 244-251

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