SwePol Link HVDC interconnection project

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A important link in the Baltic Ring.

The 600 MW submarine HVDC link between Sweden and Poland is owned by SwePol Link AB, a company jointly owned by Vattenfall AB, the Swedish Power Grid (Svenska Kraftnät) and the Polish Power Grid Company (PPGC). The converter stations as well as the cables have been delivered on a turnkey basis by ABB.

Valve hall interior Slupsk

Valve hall Stärnö The link provides a further step towards the integration of the power systems of the Baltic Sea countries. It permits the exchange of power in both directions across the borders to

smooth differing electricity demands in the two countries and to utilize the overall power generation capacity of the region more efficiently.

The transmission is of Monopolar design with a Metallic Current Return Cable forming a closed current loop.

SwePol was put in commercial operation in August 2000.

New technical features for HVDC
The SwePol Link converter stations includes a number of technical features. The most important examples are:

• MACH 2 control system
• ConTune filter
• Compact high voltage switchgear (breaker, disconnectors, earthing switches and CTs in one physical unit)
• Optical Current Transducers
• Dry type converter transformer bushings (prototype installation on one unit)

Main data
Commissioning year:	2000
Power rating:	600 MW
No. of poles:	1
AC voltage:	400 kV (both ends)
DC voltage:	450 kV
Length of DC submarine cables:	245 km
Main reason for choosing HVDC:	Long sea transmission. Non-synchronous networks.