400 KV VIENNA THE VIENNA 400 KV NORTH INPUT

摘要

Between 1978 and 1986 Wienstrom has built three 400 kV FF-cable links (south input) in Vienna (transmission station Pfarrgasse - substation Sued; substation Sued - substation Kendlerstrasse, substation Kendlerstrasse - power station Simmering), consisting of two three-phase circuits each with 1.200 mm~2 Co FF cables. Until today it is the only EHV connection for the city of Vienna. Depending on the actual increasing consumption of electricity, 2% per year as an average, Wienstrom started in the early 90th planning a new 5,2 km long 400 kV cable input, combined with a new 9,1 km long 400 kV overhead line, in the northern area of the city of Vienna. In the pre-bid stage the following different solutions were foreseen (e.g. FF - PPL - XLPE). Main technical issues: Two transmission capacities were required by Wienstrom (600 MVA without cooling system and 1.040 MVA by using a lateral cooling system with water pipes). Program of the project: The civil works started in March 2004 and the commissioning was in November 2005. The present paper includes a description of the EHV Cable system, etc. There are two three-phase circuits, etc. The XLPE Cable consists of a 1200 mm~2 copper conductor, XLPE insulation, copper wires screen in combination with welded aluminum sheath firmly bonded to the outer polyethylene sheath. The metallic sheaths are connected in a Cross-Bonding system, etc. There are six laying sections for each system with cable lengths from 850 to 890m. The cables are laid in open trefoil with a depth of 2,7 m. All joints are installed in accessible joint bays.