Everything about The Baltic Cable totally explained
The
Baltic Cable is a
HVDC power line running beneath the
Baltic Sea that interconnects the
electric power grids of
Germany and
Sweden.
The Baltic Cable uses a transmission
voltage of 450
kV – the highest operating voltage for energy transmission in Germany. long, it was the second longest high voltage cable on
earth, until
Basslink came into service in
2006. It is a
monopolar HVDC system with a maximum transmission facility of 600 megawatts (MW).
Route
The course of the Baltic Cable starts in Germany at the
inverter station at Lübeck-Herrenwyk, which is situated on the site of a former coal-fired
power station. It crosses the river
Trave in a channel below the bottom of the river and then follows its course as sea cable laid at the Eastern side of this river. After crossing the
peninsula at
Priwall the cable runs at first parallel to the coast of
Mecklenburg-Vorpommern, in order to turn behind
Rostock north-easterly toward
Sweden.
From the point on the southern coast of Sweden where it reaches land, the Baltic Cable runs for a further as an underground cable. The last of the long Baltic Cable power line are built as overhead lines hung on 40
pylons.
Although the Baltic Cable is a monopolar line, which would only require one conductor on the pylons, two conductors were installed along the whole overhead section. These conductors are permanently connected in parallel in the inverter station at
Kruseberg and at the termination of the overhead line.
Operation
Because this overhead line can generate radio interference, there's a highly effective active filter system installed at the Kruseberg inverter station. In the
Lübeck-Herrenwyk inverter station, there's no requirement for such a system, because there's no overhead powerline section on the German side of the Baltic Sea.
The cable can't be operated at the maximum transmission rating of 600 megawatts, because the 380 kV line which begins at the converter station of Lübeck-Herrenwyk ends at the
Lübeck-Siems substation. From there power flows on 220 kV and 110 kV lines, which reduces the maximum transmission rate and increases the losses of the transmission.
Expansion schemes
Of the two originally planned 380 kV lines to Lübeck (from
Krümmel Nuclear Power Plant to Lübeck-Siems and from
Schwerin substation to
Lübeck-Herrenwyk), the 380 kV line between Krümmel and Lübeck-Siems was canceled according to speakers from
E.ON AG.
There is still the option to build a 380 kV line from Lübeck to another 380 kV substation in
Schleswig-Holstein,
Hamburg or
Lower Saxony. The construction of the 380 kV link between Lübeck-Herrenwyk and Schwerin isn't progressing due to opposition from
ecologists.
A transmission rate of 600 MW should be possible via a new 220 kV cable and a
static var compensator in Lübeck-Siems after
2005.
Further Information
Get more info on 'Baltic Cable'.
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