摘要
变压器是重要的变电站设备,然而在地震中会遭受各种形式的破坏。由220 k V套管和变压器组成的体系为试验对象,进行变压器–套管体系振动台试验,测得满足IEEE 693需求反应谱的地震波激励下的体系关键位置的地震响应;以El Centro波激励下体系的地震响应为例,分析加速度和位移响应沿体系高度的分布情况;最后探讨变压器升高座和套管的地震响应机理。得到体系基本动力特性,且在峰值为0.3 g地震波激励下套管法兰出现渗油、垫片松动震害。分析表明:当套管法兰抗弯刚度较大时,变压器箱体箱壁的面外刚度不足引起套管动力响应放大和升高座摆动,套管振动与升高座摆动耦合在一起,两者绕升高座根部整体摆动;然而套管法兰刚度变小时,套管绕其根部法兰开始摆动,套管振动与升高座摆动耦合作用变弱。
Transformers are essential substation equipment, while they suffered from various damages in earthquakes. Two 220 k V porcelain bushings and transformer tank which constituted a transformer-bushing system were utilized as the test object, shaking table tests were carried out on the system. Seismic responses at key positions of the system under excitations of earthquake ground motions, which satisfy IEEE 693 required response spectra excitation, were measured. Take the system earthquake responses under El Centro earthquake record excitation for example, acceleration and displacement responses along the height of the system were analyzed, finally earthquake response mechanisms of the transformer turret and bushing were analyzed. Fundamental dynamic characteristics of the system were acquired, and cushion slippage and oil leakage at bushing flange were observed under earthquake record with peak ground acceleration（PGA） of 0.3 g excitation. Analyses indicate： when the bending stiffness of the bushing flange is large enough, the out-of-plane flexibility of transformer tank walls magnifies dynamic responses of the bushings and contributes to turret rocking vibration. There is a significant coupling interaction between bushing vibration and turret rocking vibration, and turret and bushings as a whole rock around turret bottom flange. However, when the bending stiffness of the bushing flange turned smaller, bushings rock around its flange alone, the coupling interaction between bushing vibration and turret rocking vibration became weak.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2015年第21期5500-5510,共11页
Proceedings of the CSEE
基金
国家电网公司科技项目
教育部霍英东教育基金会优选资助课题(114021)~~
关键词
变压器
陶瓷套管
振动台试验
升高座摆动
耦合作用
transformer
porcelain bushing
shaking table tests
turret rocking vibration
coupling interaction
