硬管母线连接的1000kV避雷器和电容电压式互感器抗震性能振动台试验

Shake Table Test on Seismic Performance of 1 000 kV Arrester and Capacitor Voltage Transformer Interconnected by Tube Bus

为研究地震作用下硬管母线连接特高压电气设备之间的动力相互作用,进行了由硬管母线连接的1 000 k V避雷器和电容电压式互感器（CVT）组成的互连耦合结构体系的振动台试验。通过白噪声扫频和抗震试验,测定了设备频率以及关键部位的位移、应变和加速度响应。对比分析等效单体设备与互连耦合结构的地震响应,获得了硬管母线对电气设备地震响应的影响规律。结果表明：与等效单体设备相比,互连耦合结构的设备频率、位移和应变响应均有所降低,可采用在单体设备顶端施加配重的方式来等效简化互连耦合结构;由于硬管母线和滑动金具阻尼耗能的影响,高频互感器设备的地震响应降幅较大,其频率和应变响应的降幅均为21%。互连耦合结构在双向激励下的设备地震响应与单向激励时相比有所放大,放大倍数在1.19~1.22之间。

In order to investigate the dynamic interaction between UHV electrical equipment interconnected by tube bus under seismic effect, we carried out a shake table test on an interconnected coupling structure composed by a 1 000 k V arrester and a capacitor voltage transformer（CVT） interconnected by tube bus. The equipment frequency, and some key parts＇ displacement, strain and acceleration were measured through white noise frequency sweep and seismic test. Through comparing the seismic responses of equivalent single equipment with those of the interconnection coupling structure, we obtained the influencing mechanism of tube bus on the seismic response. The test results show that, compared with those of its equivalent single setup, the frequency, displacement, and strain of the interconnected coupling structure all decrease. Single setup added weight at its top can be adopted to equivalently simplify the interconnected coupling structure. Due to the energy damping dissipation caused by tube bus and sliding fittings, the seismic response of the high-frequency CVT decreases significantly： the frequency and strain of CVT both will be reduced by 21%. Moreover, the seismic response of the interconnected coupling structure under bidirectional excitation is 0.19~0.22 times larger than that under unidirectional excitation.