摘要
为保证特高压变电工程中重要电气设备的抗震安全性,提高瓷套类设备抵御地震灾害的能力,对1000 kV电容式电压互感器(CVT)及装设了金属减震器的设备结构开展振动台试验研究,考察了特高压CVT的抗震性能和配套减震器的耗能效果。试验结果表明,应用减震器后设备的根部应力和顶部加速度幅值分别降低了59%和54%。针对试验中设备在抗震方面所表现出的不足,通过有限元仿真进一步探究了设备存在的结构缺陷,提出了通过减材方式将原型设备整体改进为塔型且局部缩调套管下、中段外径差至5 mm的结构改型优化方案。改型后,设备最大应力由32.46 MPa降至20.18 MPa,底、首节套管最大应力比由7.92降至2.33,应力分布更为均衡,设备所能满足的抗震设防要求由0.2 g提升至0.3g。针对0.3~0.5g不同等级的抗震优化目标,结合结构改型和减震手段提出了相应的1000 kV电压等级CVT抗震性能提升策略。
For ensuring the seismic safety of an important electrical equipment in an ultra high voltage power transformation project,improving the seismic withstand capability of the porcelain equipment,the seismic performances of a 1000 kV capacitor voltage transformer(CVT)with and without mental dampers were investigated by shaking table tests.The test result shows that the application of dampers reduces peak stress at the bottom of the equipment and peak acceleration at the top of the equipment by 59%and 54%,respectively.Considering the disadvantage in seismic performance for the equipment displayed in test,a finite element model was established to further explorer structure defect of equipment.A structural remolding optimization scheme improving the equipment as monolithic tower-type and adjusting outer diameter difference between the middle and bottom section of bushing to 5 mm locally by reducing material was proposed.After optimization,the maximum stress of the equipment reduces from 32.46 MPa to 20.18 MPa.The maximum stress ratio of the bottom bushing to the top bushing reduces from 7.92 to 2.33,which indicates that stress distribution is more balanced.The seismic precautionary requirement which the equipment can meet is increased from 0.2 g to 0.3 g.For different seismic optimization targets from 0.3—0.5 g,corresponding strategies for improving the seismic performance of the 1000 kV capacitor voltage transformer,which combine modification in construction with energy absorption,were proposed.
作者
林森
程永锋
孟宪政
孙宇晗
卢智成
张谦
LIN Sen;CHENG Yongfeng;MENG Xianzheng;SUN Yuhan;LU Zhicheng;ZHANG Qian(China Electric Power Research Institute,Beijing 100055,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2019年第24期91-100,共10页
Journal of Vibration and Shock
基金
国家电网公司总部科技项目(GCB17201700322)
关键词
电容式电压互感器(CVT)
抗震性能
结构优化
消能减震
capacitor voltage transformer(CVT)
seismic performance
structure optimization
energy dissipation
作者简介
第一作者:林森,男,博士,高级工程师,1987年生。
