Tide ferries

Intervention type
Commissioning
Location
Oslo, Norway

Application description

The Tide fleet has been designed according to a specific ecology contract with the city of Oslo, the power system on board is equipped with a specific double drive electrical propulsion fed by 2 gas and 2 diesel generators running on parallel.

The fleet is made to run exclusively on the gas engine with diesel on backup for a low CO 2 emissions. The ship includes a 2 split bus « tie breaker » with paralleling operation made by the 4 GENSYS MARINE mounted on board and additional synck check relays.

Our solution

The 4 GENSYS MARINE installed allow the synchronization and load management of each generator but also the propulsion limitation, and the 2 tie breakers synchronization done through the integrated GENSYS PLC. To prevent fuel feeding trouble or engine instability in the speed of one of the motors, and to maintain maximum available power, CRE TECHNOLOGY has developed a unique alarm detection function on the speed correction signal of each GENSYS MARINE on each motor. This function generates a correction (e.g. limitation of electric propulsion) to adapt the load to the available power, before a load dropping or frequency dropping, occurs on the faulty generator.

As part of the system acceptance procedure, full speed “crash stop” tests and fuel supply cuts were carried out, and each time, thanks to this GENSYS MARINE function, the tests proved conclusive, keeping the power on board.

Products installed

  • 2 x GENSYS MARINE for 2 400kVA Mitsubishi gas motors controlled by a Woodward 733 system
  • 2 x GENSYS MARINE forfor 2 400KVA Scania diesel engines controlled by ECU
  • 2 x SCR Synchronoscopes to secure bus tie breakers synchronization

Application diagram 

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