21, rue d’Artois, F-75008 PARIS B1-101 CIGRE 2006 http : //www.cigre.org 400 KV VIENNA THE VIENNA 400 KV NORTH INPUT Johannes VAVRA – WIENSTROM GmbH Manfred WANDA – Prysmian OEKW GmbH Austria SUMMARY 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 mm² 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 90 th 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.
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21, rue d’Artois, F-75008 PARIS B1-101 CIGRE 2006 http : //www.cigre.org
400 KV VIENNA THE VIENNA 400 KV NORTH INPUT
Johannes VAVRA – WIENSTROM GmbH
Manfred WANDA – Prysmian OEKW GmbH Austria
SUMMARY 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 mm² 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 mm2 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.
In this paper there also is a description of the solution adopted to minimize the Electromagnetic Field (EMF) etc. The paper illustrates the water cooling system installed to increase the power rating in emergency conditions, etc. The temperature behavior of the cable system will be continuous monitored through fiber optics and a dynamic system (RTTR), etc.
1 General The WIENSTROM GmbH as local utility is responsible for production, transmission and
distribution of electrical energy within a supply area of about 2.000 km2, consisting of the
City of Vienna and the surrounding regions of Lower Austria. The annual demand on
electrical energy amounts to more than 11.000 GWh today, the maximum load has reached
nearly 2.000 MW. More than 50 % of the electrical energy is produced in own thermal power
plants with an installed power of about 1.500 MW shown in fig [1].
Fig [1] Energy production and demand of the city of vienna
Rather early the utility decided to build up a 400 kV transmission system because of the
following main reasons: The system has to transport electrical energy from the power plant in
Simmering to other parts of the city, it is a so called backbone for the 110 kV networks which
are divided into 7 groups in the meantime and finally it is the important input for additional
electrical energy in the south of Vienna shown in fig [2].
F
After finis
in 1984
substation
input in t
Bisamberg
ig [2] Electrical networks of the city of vienna
hing the three links in 1978 (power plant Simmering – substation Kendlerstrasse),
(substation Kendlerstrasse – substation Sued) and in 1986 (substation Sued –
Sued-Ost of Austrian Power Grid) the utility rather soon started to plan a second
he north of the city to connect the important substation Nord with the substation
of Austrian Power Grid shown in fig. [3].
The detailed planning started in the early nineties, but searching for the best technical solution
under consideration of the complex approval procedure needed a lot time and effort. Finally
the utility got an approval for a technical project quite similar to the one between substation
Sued and substation Sued-Ost from 1986, namely a combined link consisting of overhead
line, transmission station and cable system shown in fig [4, 5, 6].
This so called Vienna 400 kV north input now was built in the years since 2003 and could be
set into operation on December 4th, 2005. The project therefore is the issue of this report
whereas the main focus will be the description of the cable systems.
F F
ig. [4] overview of the 400 kV north input of Vienna ig. [5] 400 kV GIS in SS Nord