特高压换流站气体绝缘金属封闭输电线路(GIL)抗震性能提升方法研究  

Study on Seismic Performance Improvement Methods for Gas⁃insulated Transmission Lines(GIL)in Ultra⁃high Voltage Converter Station

作　　者：王电处[1] 余荣兴[1] 李浩丹 张涵 WANG Dianchu;YU Rongxing;LI Haodan;ZHANG Han(China Southern Power Grid Co.,Ltd.,Guangzhou 510000,China;CSG Extra High Voltage Power Transmission Company,Dali Bureau,Yunnan Dali 671000,China)

机构地区：[1]中国南方电网有限责任公司,广州510000 [2]中国南方电网有限责任公司超高压输电公司大理局,云南大理671000

出　　处：《高压电器》2025年第4期120-129,138,共11页High Voltage Apparatus

摘　　要：随着气体绝缘金属封闭输电线路(GIL)在特高压换流电站中的广泛应用,地震对其结构安全的影响备受关注。文中基于精细化有限元模型,分析了GIL在地震作用下的响应特征,并针对抗震薄弱点提出了针对性的性能提升方法。研究表明,GIL的主要薄弱点位于竖向转角处,存在外壳强度破坏和内部导体接头拔出破坏两种模式。此外,支架的动力放大效应显著,加速度放大系数通常超过2.0,但支架的动力放大作用并非唯一决定GIL抗震性能的因素。通过提高支架的基频和固定支架与外壳的连接方式,能够有效降低内部导体的相对位移峰值和外壳的应力峰值,从而显著提升整体抗震性能。加固措施可使GIL在峰值地面加速度(PGA)大于0.4g时的地震易损性降低50%以上。文中为GIL抗震性能的提升提供了理论依据和实践指导。With the widespread application of gas-insulated transmission lines(GIL)in ultra-high voltage converter substation,the impact of seismic on its structural safety has been concerned.In this paper,the response characteris-tics of GIL under seismic action is analyzed on the basis of a refined finite element model,and specific performance enhancement methods for the seismic weak points are proposed.The study shows that the primary weak points of GIL are located at vertical bends,with such two failure modes as damage of enclosure strength and of internal pull-out of internal conductor joint.Additionally,the dynamic amplification effect of the supports is significant,the acceleration amplification factors generally exceed 2.0,however,the dynamic amplification effect of the supports is not the sole factor determining the seismic performance of the GIL.By increasing the fundamental frequency of the supports and fixing the connections between the supports and the enclosure,the peak of the relative displacement of the internal conductor and the peak stress of the enclosure can be reduced effectively,thereby significantly improving the overall seismic performance.The reinforcement measures can reduce the seismic vulnerability of the GIL by more than 50%when the peak ground acceleration(PGA)exceeds 0.4g.This study in this paper provides theoretical support and practical guidance for improving the seismic performance of GIL.

关 键 词：气体绝缘金属封闭输电线路(GIL) 抗震性能 有限元分析 支架加固 地震易损性 

分 类 号：TM726[电气工程—电力系统及自动化] TM75