Analytical Model and PEA Experiment Based Study on Identification of Homocharge Conduction, Injection and Diffusion in LDPE

抄録

Being an important member of polymeric insulation family, low density polyethylene is studied thoroughly. The major issue associated with it, homocharge accumulation (below 50 kV/mm), has got enough attention. Famous theories and simulation models have been put forth in regard to this. At the same time, available models ignored a well demonstrated concentration gradient of charges. According to the fundamental physics behind the concentration gradient of charges, the charges diffuse inside the material and contribute to the diffusion current. Available models/theories have only taken care of drift phenomenon of charges carriers, which is originated due to the electric field while neglecting the diffusion. Considering the gap, an analytical equation is derived after taking care of drift and the diffusion simultaneously. The analytical equation helps in identification and delineation of conduction of charges in bulk, diffusion of charge carriers and injection from the electrodes.