不同电压类型下油流中纤维杂质颗粒运动特性仿真研究

Simulation Research on the Motion Characteristics of Fiber Impurity Particles in Oil Flow Under Different Voltage Types

变压器油中纤维杂质颗粒受到油体流动的影响,其运动特性将发生变化,为详细探究其运动规律,采用动力学分析方法构建了单颗粒纤维杂质在流动绝缘油中固-液两相流多物理场模型,对交、直流电场下绝缘油中的不同尺寸纤维杂质颗粒在不同速度油流中的运动特性进行了系统分析。研究结果表明:油流速度对直流和交流电场下的纤维杂质颗粒影响较大,较高流速下纤维杂质颗粒不易发生碰撞,转移电荷机率降低,形成集聚的可能性减小;在直流准均匀电场中,纤维杂质颗粒在油流状态下的最大运动速度以及与电极碰撞次数和颗粒尺寸半径几乎成线性关系,且随着油流速度的增大,线性关系曲线的斜率逐渐减小;与直流电场相比,交流电场下的纤维杂质颗粒在油流作用下更加不易发生碰撞,不易在电极间转移电荷,形成“杂质小桥”的机率进一步降低。

The fiber impurity particles in the transformer oil are affected by the oil flow,and their motion characteristics will change.In order to explore its motion law in detail,this paper uses the dynamic analysis method to construct a solid-liquid two-phase flow of single particle fiber impurities in flowing insulating oil.The multi-physics model systematically analyzes the motion characteristics of different sizes of fiber impurity particles in insulating oil in different velocities of oil flow under AC and DC electric fields.The research results show that the oil flow velocity has a great influence on the fiber impurity particles under the DC and AC electric fields.At higher flow rates,the fiber impurity particles are less likely to collide,the probability of transferring charges is reduced,and the possibility of forming agglomeration is reduced.,the maximum velocity of fiber impurity particles in oil flow state and the number of electrode collisions and particle size radius are almost linear,and with the increase of oil flow velocity,the slope of the linear relationship curve gradually decreases;Compared with the fibrous impurity particles under the AC electric field,it is less likely to collide under the action of the oil flow,and it is not easy to transfer charges between the electrodes,and the probability of forming"impurity bridges"is further reduced.