Patent ID: 7992632
Filing Date: 2011-08-09
Classification: E21B,F16L,H05B

Abstract:
1. A system for power supply to subsea installations and plants for production of hydrocarbons, comprising a pipeline, wherein the possibility for internal formation of detrimental hydrates or wax deposits is present, and comprising electrical power supply cables connected to each end of the pipeline and configured to directly electrically heat the pipeline through application of alternating current to the pipeline by means of cable connectors having an electrical connection to the surrounding sea in a first circuit configuration, wherein the power supply cables are further configured to, in a second circuit configuration, provide a three phase power supply to an electrically powered motor in a subsea installation unit connected to the pipeline, and that means are arranged for switching so that three conductors forming the power supply cables form parallel conductors in the first circuit configuration, and wherein only a single power source is used to supply power to directly electrically heat the pipeline and to power the electrically powered motor.