Offshore electrical systems

The paper describes the electrical systems used on offshore (mainly North Sea) oil producing platforms. The considerations involved in the siting of equipment and generating plant, e.g. hazardous areas, safety etc., are outlined. Various aspects of designing the electrical systems such as earthing, switchgear and the voltage and frequency of the supply, are also described. The stability of the system is considered and the differences in construction and operating practice between the UK and USA are highlighted.