牵引变压器中运动金属颗粒群的分布状态及影响因素仿真研究

发布时间：2018-06-08 06:03

本文选题：牵引变压器 + 局部放电　；参考：《高电压技术》2015年11期

【摘要】：针对牵引变压器油中金属颗粒群引起的放电问题,以Fluent软件为计算工具,采用固液两相流理论中的Euler-Lagrange方法模拟牵引变压器内部油道中运动金属颗粒群的分布状态。用标准k-ε(k为湍动能,ε为湍能的耗散率)湍流模型对流动的变压器油进行描述,同时用颗粒轨道模型对油中金属颗粒群进行描述。在对颗粒轨道模型进行定义时,从颗粒受力情况、颗粒湍流扩散以及固液两相耦合3方面进行设置,从变压器油中金属颗粒尺寸、油流速度和油道电场强度等方面进行精确定义。模拟结果表明:流动状态下金属颗粒群沿牵引变压器油道运动时,其运动分布状态决定了金属颗粒与电极之间的碰撞频次,且颗粒尺寸的增大、油流速度的减小及油道电场强度的增大都会使局部放电更加剧烈。金属颗粒群的分布状态会影响流动变压器油的绝缘性能。
[Abstract]:In order to solve the discharge problem caused by metal particle group in traction transformer oil, the Euler-Lagrange method of solid liquid two-phase flow theory is used to simulate the distribution of moving metal particles in the oil channel of traction transformer with fluent software as a calculation tool. The flow transformer oil is described by the standard k- 蔚 k turbulent kinetic energy model and the 蔚 turbulent dissipation rate model. At the same time, the particle orbital model is used to describe the metal particle group in the oil. In defining the particle trajectory model, the particle force, particle turbulent diffusion and solid-liquid two-phase coupling are set up, and the size of metal particles in transformer oil is analyzed. Oil flow velocity and electric field intensity are defined precisely. The simulation results show that when the metal particles move along the oil channel of traction transformer, the distribution of metal particles determines the collision frequency between metal particles and electrodes, and the particle size increases. The decrease of oil flow velocity and the increase of electric field intensity will make partial discharge more intense. The distribution of metal particles will affect the insulation performance of fluid transformer oil.
【作者单位】：重庆大学输配电装备及系统安全国家重点实验室;武汉大学电气工程学院;
【基金】：国家自然科学基金(51377181) 重庆市基础与前沿研究计划项目(cstc2013jjb90002)~~
【分类号】：U224

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