Patent ID: 8558416
Filing Date: 2013-10-15
Classification: H01F

Abstract:
1. Power transmission system for transmitting electrical power from a power source to a subsea load, comprising: a capacitive and lossy subsea cable having a first end connected to the power source; a transformer device comprising: a magnetic core, a first winding wound around a first axis of the magnetic core, where the first winding is connected to a second end of the subsea cable; a second winding wound around the first axis of the magnetic core, where the second winding is connected to the subsea load; and a control winding wound around a second axis of the magnetic core, where the first axis and the second axis are orthogonal axes to that when the first winding, the second winding and/or the control winding are energized, orthogonal fluxes are generated in the magnetic core; a control system connected to the control winding for controlling the permeability of the magnet core to automatically provide voltage control of the voltage supplied to the subsea load by controlling the reactive power drawn from the subsea cable; where the control system comprises a voltage sensor for measuring the output voltage, where a control current supplied to the control winding is based on comparing the measured output voltage with a reference output voltage and where the control system supplies a dc current I