The electrical power system of a ship functions like a city’s electrical grid from the power generation to medium voltage distribution to the low voltage networks located in various sections of the ship’s structure. It only makes sense to treat the power system like a city’s power system, after all larger vessels include services that a city would provide and a population that would rival a city, including a military base and an airport.
This article limits the scope to the low voltage power quality standard released in September 2018, where a medium voltage standard (MIL-STD-1399-300-2) was brought forth to deal with the greater than 1 kV (typical 4 kV) portions of the power system. Note that MIL-STD-1399C is a ships interface standard with many sections published as individual documents and this review deals with section 300 Part 1 for low voltage AC power. Generally, voltages less than 1 kV are considered low voltage.
Type I is the primary low voltage power defined as 440 or 115 Vrms, 60 Hz. The 440 Vrms interfaces are three-phase or…