High-voltage DC(HVDC)cables show more efficiency than high-voltage AC cables over the long distance power transmission and have attracted significant attention recently due to rapid developments in off-shore wind farm...High-voltage DC(HVDC)cables show more efficiency than high-voltage AC cables over the long distance power transmission and have attracted significant attention recently due to rapid developments in off-shore wind farm.Polypropylene laminated paper(PPLP)insulation based HVDC cables have provided a reliable operation for many years and are the highest voltage level in operation at the moment.In this study,the authors intend to understand the electrical performance of PPLP insulation system by examining space charge in detail,especially at the interfaces.It has been found that the interface between polypropylene and Kraft paper acts as trap for charge carriers,resulting in an optimal electric field distribution in PPLP insulation system.The optimal electric field distribution enhances overall electrical performance of PPLP insulation,including higher dc breakdown strength and lower electrical conductivity.展开更多
基金supported in part by the National Natural Science Foundation of China under grant No.5107705Specialized Research Fund for Doctoral Program of Higher Education under grant No.D00033
基金the financial support received from UK Engineering and Physical Sciences Research Council(EP/L021560/1-Towards Enhanced HVDC Cable Systems)The further financial support from Shaanxi Electric Power Research Institute,China(SGTYHT/16-JS-200)is also essential.
文摘High-voltage DC(HVDC)cables show more efficiency than high-voltage AC cables over the long distance power transmission and have attracted significant attention recently due to rapid developments in off-shore wind farm.Polypropylene laminated paper(PPLP)insulation based HVDC cables have provided a reliable operation for many years and are the highest voltage level in operation at the moment.In this study,the authors intend to understand the electrical performance of PPLP insulation system by examining space charge in detail,especially at the interfaces.It has been found that the interface between polypropylene and Kraft paper acts as trap for charge carriers,resulting in an optimal electric field distribution in PPLP insulation system.The optimal electric field distribution enhances overall electrical performance of PPLP insulation,including higher dc breakdown strength and lower electrical conductivity.
