Abstract
The electrical insulating design is important to realize the HTS (high temperature superconducting) cable because this cable is operated under the high voltage environment. For the insulation design of HTS cable, it is necessary to investigate the PD (partial discharge) inception, ac and impulse breakdown strength of LN2 (liquid nitrogen)/LPP (laminated polypropylene) composite insulation system. However, the designed insulation thickness by ac and impulse could not be applied to cable fabrication process due to much low electrical breakdown strength. The effect of the multi-layered insulation paper was not considered on the previous insulation design and the insulation thickness by PD inception strength could be applied only. In this paper, the electrical breakdown characteristic, which considered the effect of multi-layered of LPP, was investigated to design the insulation thickness.
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