Experimental Study on The Motion Law of Solid Particles in Oil under Electric Field

The irregular movement of solid particles in insulating oil is caused by the influence of oil flow and electric field. During the movement of solid particles, the distribution of electric field in insulating oil will change, leading to the high electric field area in the inner part of transformer, which will lead to the discharge accident of transformer. Therefore, the experimental research work on the movement law of solid particles in oil under electric field is carried out. The main research contents are as follows: An experimental platform for the trajectory of solid particles in insulating oil was built. The experimental study on the effects of voltage type, electric field strength and particle concentration on the trajectory of solid particles was studied. The experimental results show that the solid particles always aggregate in the high electric field to form particle clusters. When the number of solid particles is large enough, a solid particle bridge will be formed through the electrode; it is difficult to form a continuous solid particle bridge under AC voltage, DC voltage and obvious small particle bridges can be observed under AC and DC composite voltage; voltage type and particle concentration are the key factors affecting the formation of small bridges of solid particles.