Characteristics of Removal by Micro Particle Size through Ion Injection in Transformer Oil

Since contamination of insulating oil causes partial discharge and mechanical malfunction, it is necessary to remove internal fine particles. Currently an electrostatic filter method is being actively studied to remove particles inside the non-conductive liquids, however this method has the drawback of being time-consuming. Recently an electrostatic filter with ion injection has been created to deal with the issue of taking a long time, however there hasn’t been enough research on removing particles of various sizes. This study used an electrostatic filter with an ion injection to remove particles of various sizes. Up to 72% of the 100 mesh-sized particles were removed after using a needle-plate electrode for 180 seconds after adding PE particles to the transformer oil. This result can be applied to studies on electrostatic force-based removal of fine dielectric particles from non-conductive liquids.