Opportunity of DC technology for powering pipe-in-pipe heating system
Abstract
The risks associated to a change in technology for heating system in pipe-in-pipe flowline technologies is evaluated. We show that the field distribution under DC stress is markedly different from that in case of AC stress owing to the high electrical conductivity of the splice joint insulation relatively to cable insulation. Model structures were used to investigate multilayer samples. Safe conditions regarding space charge accumulation were addressed. Finally, the field distribution in real joints was estimated considering the actual geometry. All in all, the results show that the cables can safely be operated under DC with at least same voltage as under AC stress.
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