CAJ | 학술논문

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 kV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。
변압기시중요적변전참설비，연이재지진중회조수각충형식적파배。유220 kV투관화변압기조성적체계위시험대상，진행변압기–투관체계진동태시험，측득만족IEEE 693수구반응보적지진파격려하적체계관건위치적지진향응；이El Centro파격려하체계적지진향응위례，분석가속도화위이향응연체계고도적분포정황；최후탐토변압기승고좌화투관적지진향응궤리。득도체계기본동력특성，차재봉치위0.3 g 지진파격려하투관법란출현삼유、점편송동진해。분석표명：당투관법란항만강도교대시，변압기상체상벽적면외강도불족인기투관동력향응방대화승고좌파동，투관진동여승고좌파동우합재일기，량자요승고좌근부정체파동；연이투관법란강도변소시，투관요기근부법란개시파동，투관진동여승고좌파동우합작용변약。
Transformers are essential substation equipment, while they suffered from various damages in earthquakes. Two 220kV 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 0.3g 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 betweenbushing vibration and turret rocking vibration became weak.