Seismic vulnerability analysis of ±800 kV converter transformer
LI Xiaoxuan1, XIE Qiang1，2
1.College of Civil Engineering, Tongji University, Shanghai 200092， China；
2.Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education, Tongji University, Shanghai 200092, China
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
[1] 梁黄彬，谢 强，何 畅，等. ±800 kV特高压直流穿墙套管的地震易损性分析[J]. 地震工程与工程振动，2020，40(02)：93-102.
LIANG Huangbin, XIE Qiang, HE Chang, et al. Seismic vulnerability analysis of ±800 kV ultra-high voltage direct current (UHVDC) wall bushing[J]. Earthquake Engineering and Engineering Vibration, 2020, 40(02), 93-102.
[2] XIE Qiang, YANG Zhenyu, HE Chang, et al. Seismic performance improvement of a slender composite ultra-high voltage bypass switch using assembled base isolation[J]. Engineering Structures, 2019, 194: 320-333.
[3] 谢 强．电力系统的地震灾害研究现状与应急响应[J]．电力建设， 2008，29(08)：1-6．
XIE Qiang. State-of-the-art of Seismic disaster research and emergency response of electric power system[J]. Electric Power Construction, 2008, 29(08): 1-6.
[4] XIE Qiang, ZHU Ruiyuan. Damage to electric power grid infrastructure caused by natural disasters in China: Earthquake, wind and ice[J]. IEEE Power and Energy Magazine, 2011, 9 (2): 28-36.
[5] 孙宇晗，程永锋，卢智成，等. 1 100 kV 复合外绝缘套管地震模拟振动台试验研究[J]. 高电压技术，2017，43(10)：3224-3230.
SUN Yuhan, CHENG Yongfeng, LU Zhicheng, et al. Study on earthquake simulation shaking table test of 1 100 kV composite external insulation bushing[J]. High Voltage Engineering, 2017, 43(10): 3224-3230.
[6] HE Chang, XIE Qiang, ZHOU Yong. Influence of flange on seismic performance of 1100 kV UHV transformer bushing[J]. Earthquake Spectra, 2019, 35 (1): 447-469.
[7] Thalia Anagnos. Development of an electrical substation equipment performance database for evaluation of equipment fragilities[R]. PEER Report 2001/06, 1999.
[8] 贺海磊，郭剑波，谢 强．电气设备的地震灾害易损性分析[J]．电网技术，2011，35(4)：25-28．
HE Hailei, GUO Jianbo, XIE Qiang. Vulnerability analysis of power equipments caused by earthquake disaster[J]. Power System Technology, 2011, 35(4): 25-28.
[9] Ersoy S, Saadeghvaziri M A. Seismic response of transformer-bushing systems[J]. IEEE Transactions on Power Delivery, 2004, 19(1): 131-137.
[10] Filiatrault A , Matt H . Seismic Response of High Voltage Electrical Transformer–Bushing Systems[J]. Journal of Structural Engineering, 2006, 132(2): 287-295.
[11] 朱瑞元，陈 迪，谢 强. 仿真变压器套管体系振动台试验研究[J]. 电网技术，2013，37(10)：2830-2837.
ZHU Ruiyuan, CHEN Di, XIE Qiang. Shaking table tests on mock transformer-bushing system[J]. Power System Technology, 2013, 37(10):2830-2837.
[12] 谢 强，文嘉意，庞 准. 大型变压器-套管体系基底隔震及其经济效用分析[J]. 高电压技术，2020，46(03)：890-897.
XIE Qiang, WEN Jiayi, PANG Zhun. Base Isolation and Its Cost-effective Analysis on Large Transformer-bushing System[J]. High Voltage Engineering, 2020, 6(03): 890-897.
[13] MA Guoliang, XIE Qiang, Whittaker AS. Seismic Performance As-sessment of Ultra-high Voltage Power Transformer[J]. Earthquake Spectra, 2019, 35(1): 423-445.
[14] 何 畅，谢 强，马国梁，等. ±800 kV换流变压器-套管体系的抗震性能[J]. 高电压技术，2018，44(06)：1878-1883.
HE Chang, XIE Qiang, MA Guoliang, et al. Seismic Behavior of ±800 kV UHV Converter Transformer and Bushing System[J]. High Voltage Engineering, 2018, 44(06): 1878-1883.
[15] 中华人民共和国住房和城乡建设部．电力设施抗震设计规范：GB50260—2013[S]．北京：中国计划出版社，2013．
Ministry of Housing and Urban-Rural Construction of the PRC. Code for design of seismic of electrical installations：GB50260—2013[S].
[16] 李 杰，李国强. 地震工程学导论[M]. 北京：地震出版社. 1992.
[17] 于晓辉. 钢筋混凝土框架结构的概率地震易损性与风险分析[D]. 哈尔滨工业大学, 2012.
[18] WEN Jiayi, LI Xiaoxuan, XIE Qiang. Cost-effectiveness of base isolation for large transformers in areas of high Seismic Intensity[J]. Structure and Infrastructure Engineering, 2020, 2021(2):1-15.
[19] Baker J W. Efficient Analytical Fragility Function Fitting Using Dynamic Structural Analysis[J]. Earthquake Spectra, 2013, 31(1): 579-599.
[20] XIE Qiang, HE Chang, YANG Zhenyu, et al. Influence of flexible conductors on the seismic responses of interconnected electrical equipment[J]. Engineering Structures, 2019, 191:148-161.
[21] HE Chang, XIE Qiang, YANG Zhenyu. Influence of Supporting Frame on Seismic Performance of 1100 kV UHV-GIS Bushing[J]. Journal of Constructional Steel Research, 2019, 161: 114-127.
