Long term operational experiences with fluid-filled and polymerised polyethylene 110 kV cables in Vienna

Wien Energie Stromnetz GmbH and Wien Energie Wienstrom GmbH are the unbundled network operator (management and service) for Vienna and its surroundings [3]. It operates a distribution network at 380 kV, 110 kV, 20 kV, 10 kV, and 400 V, with cables in any of this voltage levels, especially also in densely populated areas of Austria's capital. 110 kV cables are being used since 1960, in the beginning for transport, later, as 1979 the first fluid-filled 380 kV cables were put into operation, more and more for distribution purposes. This paper deals with our experiences in 110 kV cable operation.