DBT12/15/24 Operations Manual....31
7. TRIDENT SYSTEM
Two DBT12/15/24 units can be used to supply twice the power to the ship. The advantage of
doing this is that power will be coming from two low power shore cords, which are more common
at docks. The disadvantage is that the ship needs to be designed with a split bus electrical system,
where electrical loads are distributed approximately equally between the two buses, and no load
can exceed the rating of a single DBT unit. This is because the outputs of two independent DBT
units cannot be connected in parallel to supply a single bus, since the voltages will most likely
differ and / or the shore cords could be supplied from different phases of a 3-phase system.
A Trident System adds a Paralleling Master DBT12P/15P/24P unit to two Slave DBT12/15/24
units. Slave DBT units are DBT units that have a Paralleling Slave Option Board installed. The
Paralleling Master monitors the 2 shore voltages and, if they come from the same phase, it connects
the two Slave DBT outputs in parallel while also ensuring that the two shore cords have balanced
currents. The advantage of using a Trident Systems vs. just two DBT units is that, if the two
shore cords are powered from the same phase, loads on either ship bus up to the full system power
(twice that of a single DBT) can be supplied. If the shore cords are supplied from different
phases, then the two Slave DBT units run independently with a split bus.
All information contained in other sections of this operations manual applies to Trident Systems
as well. This section contains additional details specific to Trident Systems.
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