110kV及以上变电站地震易损性研究

Study on Seismic Vulnerability of Substations with 110kV+

摘要:

本文提出了根据变电站内高压电气设备和房屋建筑的地震破坏状态计算变电站震害指数的方法,统计了2008年汶川8.0级大地震中成都、绵阳、德阳、广元、阿坝地区国家电网的121座110kV及以上变电站的震害情况,通过震害指数进行了震害等级评价。采用对数正态分布的累积函数,拟合了变电站基于峰值加速度的地震易损性曲线。计算结果表明:当地震烈度在Ⅶ度及以下时,变电站和输电线路只有基本完好和轻微破坏状态,不发生中等及以上等级的破坏;当地震烈度为Ⅷ度时,有变电站开始出现严重破坏状态;当烈度达到Ⅸ度时,有少量变电站发生严重破坏,多数为中等破坏;当烈度为X度及以上时,多数变电站达到严重破坏和毁坏。

Abstract:

A method to calculate the earthquake damage index of substation according to the damage states of high voltage electrical equipment and buildings in substation was proposed in this paper. The seismic damage state of 121 substations of 110kV or above in Chengdu,Mianyang,Deyang,Guangyuan and Aba area in Wenchuan earthquake were analyzed. The seismic damage grade was evaluated according to earthquake damage index. The seismic vulnerability curve of substation based on peak ground acceleration was fitted by using lognormal distribution cumulative function. The calculated results show that when the seismic intensity is below Ⅶ,the damage state of substation and transmission lines is only in basically intact or slightly damage state,and no moderate damage or above damage grades occurs. While the seismic intensity increased to Ⅷ substation begins to suffer severe damage. When the intensity reaches Ⅸ,a small number of stats to show severe damage,and many substations are in moderate damage state. At intensity Ⅹ or above,most substations are severely damaged or even completely damaged.