Abstract
This paper describes developmental research of DC XLPE cable for extra-high voltage use. Through a series of investigations, an XLPE insulation compound containing a highly purified special filler was developed. To check the DC insulation performance of the cable insulated with this new material, a prototype cable with 9mm insulation thickness was manufactured. Performance results of the prototype cable were very positive. A 250kV DC cable with 20mm insulation thickness was designed and manufactured. Voltage test results showed that the DC insulation characteristics of the cable were excellent. The cable's mechanical performance was verified through a series of tests stipulated for submarine cables. Based on the DC insulation performance analyses, the possibility of reducing the insulation thickness of the developed 250kV DC XLPE cable was investigated, and it was demonstrated that a 14mm walled cable could be used.
