Abstract
Polypropylene laminated paper (PPLP) and liquid nitrogen (LN 2 ) is widely used as insulation and coolant, respectively, in high-temperature superconducting (HTS) cable system. Dielectric loss of PPLP plays an important role in the loss of AC HTS transmission system due to the dielectric properties of Kraft paper (KP). In this paper, polytetrafluoroethylene (PTFE) filter papers with different apertures were chosen to take place of KP in composite insulation system. Two layers of PTFE filter paper and one layer of polypropylene (PP) film were processed into sandwich structure through hot-press method. Dielectric loss factor and partial discharge (PD) behavior of PPLP and PTFE/PP composite insulation were tested. Experimental results show that PTFE/PP composite insulation shows better dielectric properties and resistance to PD. The dielectric loss of insulation material can be reduced to about a half by replacing PPLP with PTFE/PP composite insulation in AC transmission system. And partial discharge inception voltage (PDIV) of PTFE/PP is higher than that of PPLP.
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