3rd Quarter 2013Electrical switching & drive systems & components
Siemens has developed the world‘s first electrically-powered car ferry together with the Norwegian shipyard Fjellstrand. The 80 metre vessel can carry 120 cars and 360 passengers. From 2015 onward, it will serve the route between Lavik and Oppedal, across the Sognefjord.
The ship‘s batteries will be recharged in the breaks between crossings, a procedure which only takes 10 minutes. The vessel currently serving this route uses approximately one million litres of diesel a year and emits 2680 tons of carbon dioxide and 37 tons of nitrogen oxides. The electrically-powered ferry was developed for submission to a competition organised by Norway‘s Ministry of Transport. As a reward for winning the competition, the shipping company Norled has been granted the licence to operate the route until 2025.
The ferry has been specially designed to accommodate the requirements of an electric drive system. As a catamaran with two slim hulls, it offers less resistance in the water than a conventional vessel. Furthermore, the hulls are made of aluminium instead of steel, which is conventionally used. Rather than a diesel engine, the ferry is equipped with electric motors to drive the ship‘s two screws. These motors are powered by a battery weighing 10 tons. All in all, the new vessel weighs only half as much as a ferry of conventional design. This saving has a direct impact on the specifications of the drive system.
Whereas the ferry currently serving the route has an engine with an output of 1500 kW, the battery in the new vessel will have an output of 800 kW. In normal conditions, operating at a speed of 10 knots, battery power of 400 kW will suffice.
The crucial feature of the new ferry is that it only takes 10 minutes to recharge the batteries. In the two small villages linked by the ferry, however, the local grid is not equipped to deliver such a large amount of power in such a short space of time. To deal with this problem, batteries have been installed at each port.
These recharge the ferry‘s battery during turnaround and are then themselves slowly recharged from the local grid. Hundreds of ferries link Norway‘s mainland to the islands off its coast and provide routes across its many fjords. Using today‘s battery and recharging technology, all crossings of up to 30 minutes in duration could be served by electrically powered vessels.
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