摘要
现有对变压器的抗震研究多集中于与基础固接的变压器,对浮放式变压器的抗震性能分析较少。文中选取工程中某500 kV浮放式变压器,文中对该500 kV变压器进行精细化建模,采用考虑变压器出线端耦连回路的抗震性能分析方法,通过有限元时程计算得到变压器关键位置的地震响应数据,分析地震中可能出现破坏的薄弱环节,并分析了变压器整体的水平滑移。结果表明:变压器的前10阶自振模态是高压套管—升高座体系及油枕等部件的一阶平动或扭转模态,自振频率在1~10 Hz范围内,与地震动的卓越频率重合;地震作用下变压器的GIS套管变截面处、油枕支撑根部应力水平较高,存在峰值应力超过材料极限应力的风险,是变压器的抗震薄弱位置。地震作用下浮放变压器产生一定的水平滑移,导致变压器整体位移,在高压出线端结构内产生一定的牵拉应力,致使应力水平增加,加剧结构破坏的可能。
Most of the existing research on the seismic performance of transformer is focused on the transformers with fixed connection to the foundation.While the seismic performance analysis of free-standing transformer is less.In this paper,a 500 kV free-standing transformer for a project is selected and a refined modeling for the transformer is carried out.The seismic response data of the key position of the transformer is obtained by using the seismic perfor-mance analysis method considering the coupling loop of the transformer outlet.The vulnerable parts that may be dam-aged in the earthquake is analyzed,and the overall horizontal sliding of the transformer is analyzed.The results show that the first ten natural vibration modes of the transformer are the first order transnational or torsional modes of com-ponens such as the high-voltage bushing-turret system and the oil conservator,and the natural vibration frequency is in the range of 1-10 Hz,which coincides with the excellent frequency of ground motion.The stress level at variable section of GIS bushing and the root of the oil conservator support the transformer is high under seismic condition,has the risk that the peak stress exceeding the material ultimate stress and is the weak positions of the transformer.In seismic cases,the free-standing transformer will produce a certain horizontal slip,resulting in the overall displace-ment of the transformer,and producing a certain tensile stress in the structure of the high-voltage outgoing terminal,which will increase the stress level and aggravate the possibility of structural damage.
作者
洪志湖
邹德旭
周仿荣
代维菊
闵青云
晋金帅
申国标
张振
李达
杨舟
朱旺
HONG Zhihu;ZOU Dexu;ZHOU Fangrong;DAI Weiju;MIN Qingyun;JIN Jinshuai;SHEN Guobiao;ZHANG Zhen;LI Da;YANG Zhou;ZHU Wang(Electric Power Research Institute of Yunnan Power Grid Corporation,Kunming 650214,China;Wenshan Power Supply Company of Yunnan Power Grid Corporation,Yunnan Wenshan 663000,China;Yuxi Power Supply Company of Yunnan Power Grid Corporation,Yunnan Yuxi 653100,China;Nujiang Power Supply Company of Yunnan Power Grid Corporation,Yunnan Nujiang 673299,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《高压电器》
2026年第2期71-77,共7页
High Voltage Apparatus
基金
南网电网公司科技项目(电气设备抗震检测评估及防震救灾应急保障技术研究)。
关键词
浮放式变压器
有限元仿真
模态分析
地震响应
水平滑移
free-standing transformer
finite element simulation
modal analysis
seismic response
horizontal slip
