engleski

POWER PLANT SYSTEM – ELECTRICAL SAFETY ON SHIP

Designing the electric power system of a ship traditionally means calculation of the necessary power production and number of generators, as well as loading of cables, breakers, transformers and other critical components, both under normal load and short circuit conditions. Analyses of transient conditions are often limited to simplified calculations of start-up of large motors, i.e. motors with a rating of more than about 10% of the rating of the generators running. In many cases these calculations will be sufficient especially in systems with high generating power, large asynchronous motors, or large static converter loads. For such systems it would be of current interest to carry out more analyses e.g. of transient conditions during faults and start-up of motors, as well as analyses of harmonics when static converter load is present. This work is carried out to improve the basis for designing electric power systems for ships, and to give an overview of the different tasks during the design stages. The emphasis is on establishing routines for examination of electric power systems for ships, with respect to establishing general guidelines and a presentation of routines in a manual for the designing of the electric power systems of ships. The electric power system (prime movers, generators, transformers, motor drives, cable … ) in this paper, are modelled dependent on the purpose and method of the analyses.

power plant; safety; power management

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