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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。
Aiming at the discharge problem caused by metal particles in traction transformer oil, Euler-Lagrange method in solid-liquid two-phase flow theory is used to simulate the distribution of moving metal particles in the oil passage inside the traction transformer using Fluent software as a calculation tool. The flow transformer oil is described by the standard k-ε (k is the turbulent kinetic energy and ε is the turbulent dissipation rate) turbulent flow model, and the metal particles in the oil are described by the particle orbit model. In the definition of particle orbit model, particle force distribution, particle turbulence diffusion and solid-liquid two-phase coupling are set 3, from the transformer oil in the metal particle size, oil flow velocity and oil field strength and other aspects of precision definition. The simulation results show that when the metal particles move along the oil passage of the traction transformer under flowing condition, the motion distribution determines the collision frequency between the metal particles and the electrode, and the particle size increases, the oil flow velocity decreases and the oil passage Increasing the electric field intensity will make the partial discharge more intense. The distribution of metal particles affects the insulating properties of the fluid transformer oil.