T形高压断路器结构模型抗震性能试验及有限元分析

Seismic Performance Test and Finite Element Analysis of T-Shaped High-Voltage Circuit Breaker Structure Model

基于相似理论针对T形LW15A-363/Y瓷柱式高压断路器结构设计制作了一个缩尺比例为1/4.5的断路器试验模型。采用El Centro波、兰州波和台湾Chi-Chi地震波作为地震动输入,分别沿X向和Y向进行了不同地震峰值加速度(peak ground acceleration,PGA)下的模拟地震振动台试验,研究该结构模型在绝缘瓷柱根部、设备顶部和设备根部等薄弱部位的地震响应规律。另外,瓷柱选用C3D8R单元,法兰选用S8R单元,采用扫掠网格划分方式建立了ABAQUS有限元模型,进行了El Centro波X方向激励下的动力响应分析。结果表明,T形高压断路器为单轴对称结构,其平面内外的刚度差异较大,因此,结构模型在Y方向地震激励下的动力反应大于X方向,且该方向上绝缘瓷柱端部的地震响应最大,其加速度放大系数为1.1~2.2,有限元与试验所得自振频率最大误差为13.2%,加速度响应峰值最大误差为9.2%,位移响应峰值最大误差为14.3%,二者基本吻合。研究成果可为同类结构的抗震设计与工程应用提供参考。

Taking the T-shaped LW15A-363/Y high-voltage circuit breaker structure as the prototype,based on the similarity theory,an experimental model with 1:4.5 reduced-scale is designed and constructed.El Centro wave,Lanzhou wave and Chi-Chi wave are adapted as the ground motion input,respectively along the X and Y axial to the model,the simulated earthquake shaking table test is carried out under different peak ground acceleration(PGA).The seismic response law of the model is studied in the weak parts such as the root of the insulating porcelain column,the top and root of the equipment.In addition,C3D8R element is used for porcelain column and S8R element for flange.ABAQUS finite element model of model structure is established by sweeping mesh division method,and the dynamic response at El Centro wave under X direction excitation is analyzed.Results show that there is a large stiffness difference between inside plane and outside plane of T-shaped high-voltage circuit breaker for single axial symmetry structure,so the dynamic response of structure model under seismic excitation in the Y direction is greater than the X direction;and the seismic response at the end of the insulated porcelain column in the Y direction is the largest and the acceleration amplification coefficient is from 1.1 to 2.2.Between the finite element analysis and the test,the maximum error of natural vibration frequency is 13.2%,the maximum error of acceleration response peak is 9.2%and the maximum error of the displacement response peak is 14.3%,so the two fit well.The research can provide reference for seismic design and engineering application of such circuit breaker structures.