1100kV变压器套管抗震性能

发布时间：2018-10-18 15:50

【摘要】：为评估某型号1 100 kV变压器陶瓷套管的抗震性能,对该型套管进行了有限元分析和振动台试验。有限元分析和振动台试验得到了套管的自振频率和振型以及套管在地震波激励下的加速度、应变和位移响应。有限元分析基本预测了套管的动力特性和地震响应。结果表明:该型特高压变压器瓷套管前3阶的模态频率都在地震动的主要频率影响范围内,套管的振型为弯曲变形,阻尼比仅为0.009 8;在单向幅值为0.5g(g为重力加速度)的地震激励下,套管没有出现结构性破坏;套管的加速度响应以第1和2阶模态振动响应为主;套管空气侧瓷套底部的变截面处的抗拉正应变达432με(ε为应变),根部抗拉正应变为120με;套管顶部和底部的位移响应分别达92mm和12 mm;套管法兰处的弯曲刚度发生了较大变化,法兰处的抗弯刚度仅为相邻瓷套抗弯刚度的1/7。
[Abstract]:In order to evaluate the seismic performance of a certain type of 1 100 kV transformer ceramic casing, finite element analysis and shaking table test were carried out for this type of casing. The natural vibration frequency and vibration pattern of the casing and the acceleration strain and displacement response of the casing under seismic excitation are obtained by finite element analysis and shaking table test. The dynamic characteristics and seismic response of casing are basically predicted by finite element analysis. The results show that the modal frequencies of the first three steps of the porcelain sleeve of this type of UHV transformer are all within the main frequency range of the ground motion, and the mode of the casing is bending deformation. The damping ratio is only 0.009, under the earthquake excitation of 0.5 g (g is gravity acceleration), the casing has no structural damage, and the acceleration response of casing is mainly the first and second order modal vibration response. The tensile positive strain at the variable cross section of the bottom of the ceramic sleeve on the air side of the casing is 432 渭蔚 (蔚 is strain), and the tensile positive strain at the root should become 120 渭蔚, and the displacement response at the top and bottom of the casing reaches 92mm and 12 mm; respectively, and the bending stiffness of the flange is greatly changed. The bending stiffness of the flange is only 1 / 7 of the bending stiffness of the adjacent porcelain sleeve.
【作者单位】：同济大学建筑工程系;
【基金】：国家电网公司科技项目(20141625)~~
【分类号】：TM41

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