Modeling of space charge dynamics in polyethylene under AC stress based on bipolar charge transport model. (18th November 2020)

• Record Type: Journal Article
• Authors: Cai, Xinjing; Lin, Xin; Yu, Jianli; Lu, Zhiwei
• Is Part Of: Materials research express. Volume 7:Number 11(2020)
• Publication Date: 2020-11-18
• Subjects: space charge -- polyethylene -- AC stress -- current density -- electroluminescence; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/abc58c
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: Space charge dynamics under AC stress is of importance as a majority of high voltage cables are under AC stress, and space charge is the driving mechanism of dielectric degradation under these conditions. Bipolar charge transport model is used to simulate space charge dynamics in polyethylene under AC stress. The current density, electroluminescence intensity and space charge density under sinusoidal, triangular and square voltages are compared. It is found that there is no phase shift between current density, electroluminescence intensity and applied voltages, which disagrees the results of Baudoin et al. The thickness of space charge layer under AC stress is much thinner that under DC stress.