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By using the Finite Element Method (FEM), calculation techniques of electric field distribution for AC, DC voltages and DC polarity reversal conditions were developed in oil-pressboard (PB) composite insulation systems. By using PB layered models under HVDC conditions, it was recognized, the electric field distributions were remarkably controlled by PB arrangement in oil. In particular, it was clarified...
There is a need to develop materials with controlled electrical resistivity, reduced space charge accumulation, higher thermal conductivity, higher dielectric strength and enhanced voltage endurance to cope with DC stresses in High Voltage Direct Current (HVDC) transmission systems in addition to HVAC requirements. If the balance of properties, performance and process requirements are achieved this...
Compared to conventional ac cables, the current rating of HVDC cable circuits is more complicated because the permissible current is not only limited by the operating temperature, but also by the electrical stress within the insulation. Therefore the IEC60287 current rating standard is considered insufficient for some HVDC applications because it fails to include the stress limitation. This paper...
Since the beginning of the 20th century, the main insulation of power transformers has been built up efficiently with oil-impregnated cellulose, and since the 1960ies as layered oil/board-insulation. The latter represents a hybrid system, consisting of oil filled gaps subdivided by pressboard barriers.
Our world carries an increasing burden of increasing CO2 emissions. Rather than rationing the use of electric power we should all together organize ourselves towards a positive solution that benefits growth and a sustainable society. A corner stone is the HVDC technology that makes it possible to transport sustainable energy to the regions of consumptions that are often far away from each other. Todaypsilas...
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