±800 kV干式平波电抗器抗震性能分析

Seismic Performance Analysis of ±800 kV Dry-type Smoothing Reactor

摘要:

为了研究平波电抗器在地震下的动力响应以及设备耦联对地震响应的影响，文中采用Abaqus有限元软件对一典型±800 kV干式平波电抗器进行仿真模拟和模态分析，选取符合场地需求谱的三组地震波进行了地震响应计算，分析电抗器本体顶部加速度峰值、顶部相对位移峰值以及下部支撑绝缘子的根部应力峰值。重新建立双电抗器“T”型耦联模型，采用同样的地震波输入并提取地震响应峰值与单体响应结果对比，研究了耦联对电抗器地震响应的影响。研究发现在0.2g地震波下，电抗器本体顶部加速度峰值均值达到2.34 m/s2，顶部相对地面的位移最大达到152.97 mm，根部应力峰值均值为22.88 MPa。耦联后电抗器本体顶部两个水平方向加速度峰值均有所降低，在耦联方向上顶部相对地面位移有所降低，而垂直于耦联方向的水平方向上的相对地面位移反而有所提高，耦联对电抗器支撑绝缘子根部应力峰值影响不大。工程中可采用各类减震隔震措施对电抗器特定方向的动力响应进行控制，以保证电抗器在地震下的结构安全。

Abstract:

In order to study the dynamic responses of smoothing reactor under earthquakes and the influence of equipment coupling on seismic response, the simulation and modal analysis of a typical ±800 kV dry-type smoothing reactor are carried out by Abaqus finite element software. The three groups of seismic waves which meet the demand of the required spectrum are calculated for the seismic responses, and the peak top acceleration, the peak top relative displacement of the reactor body and the peak stress of the root of support insulator are analyzed. The double reactor "T" coupling model is reestablished, and the same seismic wave inputs are used to extract the seismic response peaks and compare them with the responses of single model. The influence of coupling on seismic responses of reactor is studied. The study indicates that under the 0.2g seismic wave, the average peak acceleration of the top of reactor body reaches 2.34 m/s2, the maximum displacement of the top relative to the ground is 152.97 mm, and the average peak stress of the root is 22.88 MPa. After coupling, the two horizontal acceleration peaks at the top of reactor body decreases, and the relative ground displacement of the top in the coupling direction [JP]decreases, while the relative ground displacement in the horizontal direction perpendicular to the coupling direction is increased. So coupling has little effect on the peak root stress of support insulator. In the project, various seismic isolation measures can be used to control the dynamic response of reactor in a specific direction to ensure the structural safety of reactor under earthquakes.