船舶三相非接地電源系の―線接地電流の実測について

概要

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Recently it is conspicuous that the increasing tendency of the capacity of the ships AC power system adopted to the large vessel like container ship. So it is easy to predict that the greater the electric power capacity becomes, the larger the leakage current between the power circuit and the hull increases according to the large changes of electrostatic capacitance C and small leakage resistance ρ. This paper describes the measured results of the arcing grounded current of non-grounding three-phase power system for ships service, and the relationships between the electric power capacity P and the leakage circuit parameters C and ρ, and the direct arcing grounded current IR0 and safety voltage VB. It is confirmed that the leakage parameters C and ρ can be estimated by the electric power capacity P. Consequently it may be suggested that a given value of P can give not only the values of IR0 and VB but also the relationship between the grounded resistance RG and VB for the non-grounded electric power system.