Hällsjön: The first HVDC Light transmission

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The start of a completely new power transmission technology.


The world's first HVDC Light test transmission was a 3 MW ±10 kV link between Hällsjön and Grängesberg in central Sweden. It uses a 10 km long, temporarily de-commissioned AC line owned by VB Elnät, a subsidiary of Vattenfall AB. Trial operation in the field started in March 1997.

The transmission normally serves either as a feeder into the Grängesberg AC grid or into an islanded part of that grid. In the latter case, the DC system feeds into a passive load with no other source of power. The HVDC Light transmission then alone controls the voltage level and frequency.

The 3 MW Hellsjön transmission
The 3 MW Hellsjön transmission

During the first years a number of tests have been performed to verify the HVDC Light concept, and between the tests, the stations have been in operation on a 24-hour schedule either in transmission mode or in SVC mode to gather experience. Hellsjön is also a test bench for new components and equipment.

Main data
Commissioning year: 1997
Power rating: 3 MW
No. of poles:1
AC voltage:10 kV (both ends)
DC voltage:±10 kV
Length of DC overhead line:10 km
Main reason for choosing HVDC Light:Test transmission

Last edited 2008-03-27
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