±800 kV特高压直流穿墙套管地震模拟振动台试验研究  

Shaking Table Tests on ±800 kV UHV DC Wall Bushing

作　　者：谢强[1] 何畅[1] 杨振宇[1] 卓然 

机构地区：[1]同济大学土木工程学院,上海市杨浦区200092 [2]南方电网电力科学研究院,广东省广州市510063

出　　处：《电网技术》2018年第1期140-146,共7页Power System Technology

基　　金：教育部霍英东教育基金会优选资助课题(114021);科技部国家重点实验室基金课题(SLDRCE10-B-01)~~

摘　　要：特高压直流穿墙套管是换流站中的重要设备。为评估特高压穿墙套管的抗震性能及地震作用下的响应特征,对±800 k V足尺仿真穿墙套管模型进行了地震模拟振动台试验研究。通过白噪声扫频试验获得了套管的动力特性。通过不同地震动输入,研究了穿墙套管在不同地震动和加速度峰值输入下的响应,获得了穿墙套管关键位置的位移、应变及加速度响应。结果表明,在目标峰值地震动作用下,穿墙套管顶端位移及根部应力较大,外套筒与中间导电杆间的相对位移也较大。在对特高压换流站穿墙套管进行抗震设计时,应注意与之相连的母线冗余度以减小母线对套管的牵拉作用,采取措施提高穿墙套管的应力安全系数,优化套管内部结构以限制其导电杆与外套筒的相对位移。UHV DC wall bushings are important components in converter substations. In order to evaluate their seismic performance and dynamic responses under seismic action, shaking table tests on a full-scale mock ±800 k V wall bushing were carried out. Dynamic characteristics were obtained with white noise excitation. Displacements, strains and accelerations of critical parts of the bushing under different input ground motions with different peak ground accelerations were measured. Results indicated that there were large displacements on top of the bushing and large stresses at bottom cross section. Relative displacements between composite bushing and central conductor were large. Redundant of buswork at the end of the bushing should be large enough to eliminate negative impacts between bus connection and wall bushing. Countermeasures should be taken to increase stress safety factor, and structure inside the bushing should be optimized to reduce relative displacements between conductor and composite bushing.

关 键 词：特高压穿墙套管 摇摆振动 振动台试验 动力特性 地震响应 

分 类 号：TM83[电气工程—高电压与绝缘技术]