W. Boone, G. Sebregts, N. Steentjes, F. de Wild, J. van Rossum, and Q. Zhuang: Investigations towards the Upgrading of Existing 10kV Cables and Accessories to an Operating Voltage of 20kV. presented at CIRED 2011, Proceedings of the 21st Int’l Conference and Exhibition on Electricity Distribution, 2011.
In this paper a survey will be given of the investigation to decide in a well considered way on the upgrading of existing 6/10 kV cables and accessories to an operating voltage of 20 kV. The investigation consists of: a theoretical study, experimental testing and a decision procedure. The theoretical study has the purpose to evaluate all relevant aspects related to the upgrade, for instance the ageing mechanisms at increased voltage and the corresponding lifetime reduction. The next step is the experimental testing. The experimental testing consists of laboratory and field testing. The final decision procedure is to decide between three options: the upgrade is considered to be feasible, not feasible or partly feasible (10 kV cable + 20 kV accessories).