±800 kV支柱复合绝缘子抗震试验研究

为分析复合材料电气设备的结构特点与抗震性能,针对工程应用的2种±800 kV复合支柱绝缘子进行了无支架结构和有支架结构地震模拟振动台试验。通过白噪声和抗震试验,测量了设备关键部位的位移、应变和加速度响应,对比分析了支柱复合绝缘子在有无支架下的地震响应。试验结果表明,支架略降低了试验设备结构一阶频率,增大了设备阻尼比,且对较柔设备影响较小;在0.1~0.4 g地震波激励下,设备的应力和位移响应基本呈线性变化;应力、位移、加速度和谱加速度的动力放大系数均小于1.30,其中加速度峰值的放大系数最大,支架使地震波频谱在高频部分产生放大作用,设备结构频率在地震波频谱曲线上的分布与其支架应力放大系数正相关,支架对设备位移略有放大作用。

Experimental Study on Seismic Performance and Structural Characteristics of ±800 kV Composite Post Insulators

In order to analyze the structural characteristics and seismic performance of composite electrical equipment, a seismic shake table test is conducted on two types of ±800 kV composite post insulators used in the electric power projects, i.e., post structure with support and post structure without structure. The displacement, strain and acceleration responses of the key parts of the equipment are measured through white noise and seismic test. A comparative analysis is made of the seismic responses of the composite post insulators with/without support. The experimental results show: 1) the support slightly reduces the first order frequency while increasing the damping ratio of the test equipment, but has less influence on the damping ratio of the flexible equipment; 2) the stress and displacement responses are basically linear under the seismic excitation of 0.1 g to 0.4 g; 3) the support dynamic amplification coefficients of stress, displacement, acceleration and spectral acceleration are all less than 1.30 with the amplification coefficient of peak acceleration being the largest; 3) the support amplifies the spectrum of seismic waves in the part of high frequency, and 4) the structural frequency distribution of equipment on the seismic wave spectrum curve is positively related to the amplification factor of the support stress, and the support slightly enlarges the equipment displacement.