The paper provides an overview of and operating experiences with the subsea power supply systems for the Statoil fields utilizing high voltage power; Lufeng (seabed booster pumps), Troll (oil/water separation, water re-injection) and Tordis (separation, boosting, water re-injection). The paper gives a status on performance of the power system for these projects, and an overview of the most important "lessons learned". The Tyrihans pump power supply system, which represents the world's longest step-out with topside VSDs and highest subsea motor power, is also briefly presented.Future fields utilizing subsea processing at deeper waters and with longer tie-backs will require further development of power system technology and Statoil is undertaking several qualification programs for such applications. Status of Statoil's main ongoing qualification programs within HV power is given, including R&D and study activities. The overview includes status on all main power supply components such as motors, connectors, VSD, switchgear, transformers and cables/umbilicals within these projects.The information provided gives a good overview of "state of the art" of subsea HV power systems and components within Statoil, and can be useful to both manufacturers and end users of subsea power components.
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