基于Weibull分布的电瓷型电气设备地震易损性分析  

Weibull Distribution Based Seismic Vulnerability Analysis of Porcelain Power Equipment

作　　者：刘振林[1] 代泽兵[1] 卢智成[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192

出　　处：《电网技术》2014年第4期1076-1081,共6页Power System Technology

摘　　要：电瓷型电气设备的高强瓷套管是其地震作用中的薄弱环节,具有较高的断裂易损性。为分析此类设备的地震易损性,从高强瓷材料的强度机制出发,确定了材料强度的Weibull分布形式和弯矩作用下尺寸效应计算公式,并结合基于反应谱法得到的地震作用随机参数,建立了震害为瓷套断裂的易损性分析方法。选取了某500 kV避雷器为例进行地震易损性分析,研究了地震动、场地条件、结构尺寸对设备易损性影响。分析方法可用于电瓷型电气设备瓷套强度计算、设备场地选址、结构抗震设计优化、震害风险预测等工作,为提高电网抗震能力,减少震害损失提供技术支持。Due to its high vulnerability the high-tension porcelain bushing is the weak component of porcelain power equipment during the earthquake. To analyze seismic vulnerability of porcelain power equipment, in terms of the strength mechanism of high strength porcelain material the Weibull distribution of material strength and the computing formula of size effect under the action of bending moment are determined. Combining with the random parameter of earthquake action obtained by response spectrum method, a seismic vulnerability analysis method for porcelain bushing fracture is established. Selecting a certain 500 kV lightning arrestor as example, its seismic vulnerability is performed, and the impacts of earthquake motion, site conditions and structural size of equipment on its vulnerability are researched. The analysis method applied in this research can be used to such works as porcelain bushing strength calculation, optimization of structural aseismatic design, risk profile of earthquake damage and so on to provide technical support for enhancing seismic resistant capability of power grid and reducing the earthquake damage loss.

关 键 词：电瓷型电气设备 地震 高强瓷 Weibull 分布 尺寸效应 易损性 

分 类 号：TM721[电气工程—电力系统及自动化]