Evolving grid Fenno-Skan 2 HVDC link - Fingrid

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Thyristor valves at the
converter station in
Rauma. At the converter
station, direct current is
converted to alternating
current and vice versa.
More than 40 per cent of
additional transmission capacity
Fingrid and Svenska Kraftnät, the electricity
transmission system operators in Finland and
Sweden respectively, signed an agreement on the
construction of the Fenno-Skan 2 high-voltage
direct current transmission link in February 2005.
The criteria for the capital investment were
straightforward:
to increase the electricity transmission capacity
between Finland and Sweden by 40 per cent
and join the market more closely together
to reduce the formation of price area differences
between the two countries
to reduce transmission losses in the transmission
grid, and
to improve the transmission reliability of the
power system.
Ownership and costs
shared in equal proportions
The Fenno-Skan 2 HVDC link with a power of
800 megawatts will be completed in late 2011.
Fingrid and Svenska Kraftnät share the ownership
and capital expenditure costs of the interconnector,
totalling approx. 315 million euros, in equal
proportions.
The total length of the connection is approx. 300
kilometres. There are converter stations at both
ends of the link, used for converting direct current
to alternating current and vice versa.
In Finland, the new link is connected to the
transmission grid at the Rauma substation. In
Sweden, the connection point to the Swedish grid
is the Finnböle substation built north of Stockholm.
Fenno-Skan poles 1 and 2 will be operated
in bipolar mode.
Foremost parts of the
Fenno-Skan 2 project
Reinforcing the 33-kilometre Rauma–Rihtniemi
direct current overhead line in Finland
Modification of the Pyhämaa subsea
electrode in Finland
Rihtniemi–Dannebo submarine cable of 196
kilometres
Dannebo–Finnböle direct current overhead
line of 70 kilometres in Sweden
New Finnböle substation in Sweden.
Fenno-Skan 2
Power 800 MW at the receiving end
Voltage 500 kV DC
Current 1,663 A
Transmission link length 299 km, of which
103 km is overhead line and 196 km
submarine cable
Line commutated converter (LCC) HVDC link
Converter stations in Rauma (Finland)
and Finnböle (Sweden)
Co-operation project between Fingrid and
Svenska Kraftnät
Converter supplier: ABB AB/Sweden
Project budget 315 million euros
Commissioning at the end of 2011
Submarine cable
Type NOVA-L 500 kV 1x2,000 mm 2 Cu
Conductor 2,000 mm 2 , copper
Mass impregnated, non draining, paper
insulated (MIND)
Voltage 500 kV DC
Diameter 132.2 mm
Weight in air 58.1 kg/m
Double armour
Power 800 MW
Cable supplier: Nexans Norway AS
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