基于ANSYS Workbench的变压器铁芯—绕组振动仿真

为实现对变压器工作状态的实时监测,及时排除故障,需要对变压器铁芯—绕组进行振动仿真,根据振动情况确定最优测点.利用有限元分析法对S13—12500/35型油浸式电力变压器,在夹紧和松动2种状态下,铁芯—绕组的模态特征进行仿真分析,对比夹紧状态下铁芯—绕组振动的幅频特征.仿真结果表明:铁芯—绕组振动最强的位置主要分布在上夹件的中部和下表面左右两侧的4个端角、上铁轭的中部及三相绕组的上部;在正常预紧力下的主要响应频带在300 Hz以上,振幅频谱能量主要集中在100,300~350 Hz附近.本文为变压器振动情况的测点选择和阈值设定提供了理论依据.

Transformer iron core-winding vibration simulation based on ANSYS Workbench

In order to realize real-time monitoring on transformer working condition,and find out breakdowns timely,it is needed for transformer core-winding vibration simulation to determine the optimal measuring point according to vibration.So use finite element analysis(FEA)method on modal characteristics of S13—12500/35 type of oil-immersed power transformer core-winding in clamping state and loose state,and contrast amplitude-frequency characteristics of core-winding vibration in clamping state.The simulation results show that the strongest position of core-winding vibration mainly distributed in clamp center and the four sides of lower surface angle of the left and right and the middle of upper iron yoke and the upper part of the three-phase windings. The main response frequency band is above 300 Hz under normal preload,amplitude spectral energy is concentrated at 100 Hz and near 300~350 Hz.It provides a theoretical basis for selecting of measuring point and setting of threshold of the transformer vibration.