The simulation of charge transportation behavior in cable insulation containing vented water trees or bow-tie water trees

Abstract

The simulation is conducted in cylindrical geometry both for the insulation contains vented trees or bow-tie trees. The overall goal of this study is to expand the application range of the bipolar model, to better describe the space charge behavior in the insulation of practical engineering which may include the water tree and other defects. The dielectric properties in this paper, take the influence both of semicon layer and water tree into consideration. The efficiency of the algorithm was validated by comparing the experiment and simulation results of vented trees. The results show that a large amount of homocharge is accumulated near the vented tree tip which is identical with the experiment results revealed by previous research. The simulation results of space charge behavior in insulation with bow-tie trees show that the injected charges move toward opposite electrode as time goes on. There is little charge accumulated inside the bow-tie tree. This paper also points out that relevant parameters in simulation still need to be revised by experiments in further study, which is the main challenge in improving the accuracy and applicability.