Abstract
HVDC cable transmission plays an important role in urban center power supply, large-scale utilization of distributed energy, island and cross sea power transmission. Thermoplastic polypropylene (PP) material has excellent heat resistance and insulation performance, and can be recycled. However, it is not suitable to apply PP directly to the cable insulation for its low temperature impact and brittleness. In this chapter, polypropylene was blended with vinyl elastomer ULDPE to improve its mechanical toughness. The optimal proportion of PP/ULDPE blends was determined by the melting and crystallization behavior, mechanical tensile properties, trap distribution characteristics, space charge, conductivity and breakdown properties of the blends. Then, PP/ULDPE blends with different amount of nano graphene were prepared. The space charge, electrical conductivity and breakdown strength of PP and its nano graphene modified composites at different temperatures were measured and analyzed. Based on the isothermal discharge current method, the trap distribution characteristics of PP/ULDPE/graphene nanocomposites were obtained to study the relationship between space charge, electrical conductivity, breakdown strength and nano graphenen.
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Hou, Z., Du, B., Xu, R., Li, J., Li, Z. (2021). The Insulating Properties of Polypropylene Blends Modified by ULDPE and Graphene for HVDC Cables. In: Du, B. (eds) Polymer Insulation Applied for HVDC Transmission. Springer, Singapore. https://doi.org/10.1007/978-981-15-9731-2_5
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DOI: https://doi.org/10.1007/978-981-15-9731-2_5
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