Abstract
The rising demand for electric energy poses increasing challenges for the distribution grid. To overcome these challenges, direct current (DC) transmission will play a dominant role in the medium voltage (MV) level. On the one hand, MV alternating current (AC) cable systems can be converted into MVDC cable systems and, on the other hand, new MVDC cable systems can be implemented into the existing grid. However, MVDC cables with extruded insulation show special phenomena (e.g. space charges). Due to the interest in characteristics of this insulation this paper provides information about the DC conductivity of XLPE plaque samples during steady thermal and electric stress and during temperature changes. The plaque samples are extracted from 12/20 kV MVAC XLPE cables. The DC conductivities at steady state and during temperature changes are presented in a temperature range from 25 °C – 90 °C and an electrical stress up to 30 kV/mm.
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