Analysis of Selected Models of Body Impedance in the Assessment of Electric Shock Possibility in the Ship’s Power Supply Grids

Ship’s low voltage power supply grids with isolated neutral point of the power source are widely used in marine engineering. They can form a potential shock hazard in some specific operational state, when grid capacitance measured against ship’s hull exceed critical value. This paper presents analysis of selected models of body impedance in the assessment of electric shock possibility in the ship’s power supply grids. Main goal of the analysis is to find a relation between ground capacitance and potential shock current in onboard electrical grids with isolated neutral point of power source, using different body impedance models. The results from the simulations in various configurations are presented and analysed. The findings highlight possibility of electrical shock in isolated neutral point networks with high ground capacitance.