变压器绕组振动传递特性仿真研究

Finite Element Simulation for Transformer Winding Vibration Propagation

由于缺乏绕组振动在油中的传递模型、传递特性以及相应的仿真研究,根据波动理论,建立了油中振动的传递模型,利用多物理场耦合软件,建立了磁场-结构-流体的耦合分析模型,对一台单相10/0.4kV的双柱式、连续饼式绕组的电力变压器进行了仿真和实验研究。结果表明:油箱中的压力波动来自于高低压绕组振动产生压力波的线性叠加,高压绕组和高低压绕组引起的箱体表面油压分别位于-0.2~0.39Pa之间和-0.15~0.39Pa之间;低压绕组在油中传递时容易受到外侧绕组的阻碍,因此油箱表面受高压绕组振动影响较大;油箱表面振动取决于绕组振动的辐射压力场与油箱本体振动特性,加速度最大值为1.1mm/s^2,集中在与高压绕组距离最近的区域,因此选择测点时应当尽量选择油箱表面离绕组较近的平板区域,以获得较大的振动响应。

For lacks of propagation model,propagation property and corresponding simulation of winding vibration in oil,this paper establishes and analyzes a magnetic coupled field-structurefluid coupling model with finite element software for vibration propagation in oil.The simulations and experiments are carried out for a 10/0.4 kV single phase power transformer with continuous disk windings.The results show that the pressure fluctuation in the fuel tank comes from the linear superposition of the pressure wave of high and low voltage winding;wave pressure caused by high voltage winding and the whole winding ranges from-0.2 Pa to 0.39 Pa and from-0.15 Pa to 0.39 Pa respectively;the vibration from low voltage winding can be affected by the high voltage winding during propagation,therefore the tank vibration is greatly influenced by the vibration from high voltage winding.Tank vibration depends on the radiation pressure field of winding vibration and its vibration property,and the maximum acceleration gets 1.1 mm/s^2 and locates near the high voltage winding.It is suggested to detect the vibration in flat area where is close to the transformer winding to obtain a relatively larger vibration response.