Converters for subsea systems

Subsea converter systems are commonly used to start and operate pumps, compressors and other equipment located at the seabed.

The converter plays a major role in a complete AC power transmission and distribution system for rotating equipment in subsea applications. The power required for the subsea equipment can be produced by a generator located topside or at an onshore facility, and transmitted through a power and controls umbilical to the subsea located electrical equipment.

Locating the converter subsea eliminates the challenges related to long cables in between the converter and the electrical motor.

The Industrilink supplied converter for subsea systems is a very compact, high power density, liquid cooled unit that can easily be enclosed in an atmospheric pressure vessel.

The converter is designed to provide reliable power, protection and control of motors while reducing overall operating costs, increasing total efficiency, and maintaining system integrity. The use of the subsea converter unit reduces installation and replacement time, prolongs equipment run life, and ultimately increases production.

The converter control unit is programmable in the same manner as a PLC and includes modularized I/O option cards, fieldbus cards and safety cards. Thus, the need for additional control equipment might be excluded. This will also reduce probability for fault as the total number of subsea components is kept to a minimum. Our delivery can contain all required equipment for circulation of the cooling fluid through the outside mounted heat exchanger loop. Converter losses to ambient air are low enough to be taken care of by natural convection trough the pressure vessel.

Necessary cooling and supervision of the converter is taken care of by the converter control software. Electrical connection to the supply and to the motor can typically be done by use of subsea connectors, wet-mate or dry-mate as required by the customer.

Subsea converter line up
Subsea converter
line up
Subsea drive Illustration of a subsea unit with a redundant liquid cooled converter setup. Voltage: 400-500VAC, Max. cont. current: 261A, Typical maximum motor shaft power 2x 180-226kW, Cylinder height =1.2m and diameter = 0.55m
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