Investigation of the Microscopic Dynamical Behavior and Bridging Mechanism of Cellulose Particles in Insulating Oil

This research employs a high temporal resolution particle imaging velocimetry system to observe the entire bridging process of cellulose particles in insulating oil from a microscopic perspective. The analysis focuses on the particle dynamic behaviors that play a significant role in bridging and provided an in-depth elucidation of the bridging mechanism. By analyzing the motion characteristics of cellulose particles, mechanisms including charging, polarization, charge transfer, and inter-particle interactions were discussed. The space charge polarization effect of charged cellulose particles (SPCP) was discovered, leading to the development of a cellulose particle dynamic model that incorporates SPCP. This model provides a rational explanation for the observed dynamic behaviors of cellulose particles and holds the potential to become a fundamental theoretical in the field of liquid dielectric impurity particle contamination.