The ship requires a large mechanical power for propulsion and a small electrical power for service loads. From the mechanical and electrical power systems point of view, ships are... Read more
In a balanced 3-phase system, the magnitudes of line voltage VL, line current IL, and 3-phase power in terms of the magnitudes of phase voltage Vph and phase current Iph are derive... Read more
While at anchor the vessel’s fire alarm sounded on one of the lower decks. The OOW sent the duty seaman down to investigate. The crew member found a deck-head fluorescent light rel... Read more
The fire alarm sounded in the early morning hours during a period of diverse weather. The fire panel showed the alarm had been activated in the vessel battery locker. The crew must... Read more
The Master of a bulk carrier, newly arrived on board, noticed the starboard provision crane was not straight but slightly bent upward. A closer inspection showed cracks on the pain... Read more
Reverse Power Relay is a directional protective relay that prevents/protect the generator from motoring effect (going to reverse direction). It is used where generator runs in para... Read more
The purpose of the ship transformer is to isolate the different parts of the electric power distribution system into several partitions, normally in order to obtain different volta... Read more
The majority of new buildings and all commercial vessels have an AC power generation plant with AC distribution. The generators are synchronous machines, with a magnetizing winding... Read more
In any isolated power system, the amount of generated power must be equal to the consumed power including losses. For an electric system consisting of an electric power generation... Read more
Power electronics converters widely used in electrical power systems, with their alternative names given in parentheses: • AC-DC converter (rectifier) • AC-AC voltage converter (ph... Read more
