The Great Belt is the largest and most important channel between the islands Zealand and Funen in Denmark that connects Baltic Sea with the North Sea. The link across the Great Belt is 18 kilometers long and consists of a high-level bridge, two low-level bridges and a railway tunnel reducing travel times significantly; previously taking about an hour by ferry, the Great Belt can now be crossed in about ten minutes.
With their 254 meters, the pylons of the bridge are Denmark‘s highest construction, and the tunnel, 75 meters below sea level, is one of Denmark‘s deepest constructions. Only in 2015, the Great Belt link was crossed by 11,880,022 vehicles, of which 10,417,976 were passenger cars.
Importance of this link is vital, not only for Denmark, but also for rest of the Europe since this link is the only connection between Scandinavia and the rest of Europe by road. Therefore, the reliable power supply is absolutely necessary to sustain well working transportation network in that region.
The Great Belt link first opened in 1998 and the system put into operation during the construction is now 18 years old. Although the bridge itself has expected lifetime of 100 years, the electrical equipment must be maintained and replaced 6 to 8 times during that period.
This 18 km long link across the Great Belt Bridge is a vital part of the Danish infrastructure and is open 24 hours a day, 365 days a year putting an extremely high requirements on equipment controlling and supervising power supply.