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There is over 1000 km of electrical cables in a nuclear power plant. The insulation around these wires is made of ethylene propylene rubber and cross-linked polyethylene that are subjected to radiation damage in addition to environmental damage. It is highly desirable to develop a means for understanding and testing the effect of damage on these cables. Here we present a two-scale modeling approach...
Polyethylene has been widely used as the insulation of high voltage power cables due to its excellent dielectric properties and electrical performance. The existence of space charge in polymeric insulators is a significant issue with respect to life expectation. It can alter the local electric field and initiate possible partial discharge or eventual breakdown. This appears relatively more severe...
A bipolar charge transport model has been developed to simulate the dynamics of space charge under dc fields. The modeling shows space charge build-up and decay comparable to experiments. In this paper, this bipolar charge transport model is taken further to simulate the space charge in polyethylene under ac fields. The results show that there is small quantity of phase-dependent bipolar charge accumulation...
Transient space charge within polyethylene has been simulated based on a bipolar charge transport model with a constant mobility. Initial results are in good agreement with those previously reported. To further develop the model, two types of field-dependent carrier mobility: power-law mobility and Poole-Frenkel mobility are considered in the charge transport process. Various space charge profiles...
Two-dimensional (2D) FT-IR spectroscopy along with high-resolution and cryogenic techniques was used to investigate the CH 2 rocking bands (750–700cm −1 ) of high-density polyethylene (HDPE). The 2D asynchronous spectrum shows that multiple forms of orthorhombic polyethylene co-exist in HDPE. Each of the two orthorhombic bands around 730 and 720cm −1 , is composed of at least...
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