2.2.2
Constant speed applications
Fig 2-3
Maximum load increase rates for engines operating at nominal speed
The propulsion control and the power management system must not permit faster load
reduction than 20 s from 100% to 0% without automatic transfer to diesel first.
In electric propulsion applications loading ramps are implemented both in the propulsion
control and in the power management system, or in the engine speed control in case
isochronous load sharing is applied. When the load sharing is based on speed droop, it must
be taken into account that the load increase rate of a recently connected generator is the sum
of the load transfer performed by the power management system and the load increase
performed by the propulsion control.
Maximum instant load steps
The electrical system must be designed so that tripping of breakers can be safely handled.
This requires that the engines are protected from load steps exceeding their maximum load
acceptance capability. If fast load shedding is complicated to implement or undesired, the
instant load step capacity can be increased with a fast acting signal that requests transfer to
diesel mode.
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Wärtsilä 50DF Product Guide - a16 - 9 September 2016
Wärtsilä 50DF Product Guide
2. Operating Ranges
Summary of Contents for WARTSILA 50DF
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