Subsea Variable Speed Drives

Nebb develops and have qualified subsea Variable Speed Drives (VSD) for operations down to 3000 m.

Key characteristics:

• Small - competing solutions are many times bigger.
• Proven - thousands sold for onshore use.
• Flexible - operates many types of motors: induction machines, permanent magnet and servo motors.
• Robust - tolerate vibration, shock and electrical fluctuations. ISO 13628-6/API 17F.

Power transmission to subsea pumps and other power consumers are usually hydraulic from topside. In some cases, electric power transmission to a subsea motor is used, with a VSD placed topside.

Subsea VSDs have only been available for small electric motors so far, and this has limited the freedom of subsea process/production systems design. With Nebb's subsea VSDs, this limitation is gone.

Model	4 kW Flex & 4+ kW Compact	45 kW / 55 kW	350-1500 kW
Typical applications	Actuators - valve operations. Small pumps - lubrication, hydraulics etc.	Active cooling - cool well stream before export or compression. Medium-sized pumps - hydraulics, lubrication, chemicals etc.	ESP (electrical submersible pumping) - downhole pumping. Water injection - for maintaining well pressure. Condensate pumps.
Status	Qualified. ISO 13628-6.	Qualified to ISO 13628-6, incl. 1-year+ subsea test.	Design phase.
Photo
References		Project reference

Typical technical data:

• Power: 0-100 kW
• Input voltage: 380-500 VAC or 690 VAC 50/60 Hz
• Operating depth: 0-3000 m
• Qualification: ISO 13628-6/API 17F
• Regulation control modes: Vector control with Speed feedback, Vector control open loop, V/F
• Max Output frequency 500Hz
• DC Choke integrated
• EMC Filter integrated
• Dynamic Braking Module integrated up to 75kW (option)
• Overload according to IEC146 Class 1 and Class 2
• Heavy-duty and Light-duty overload management
• Safety Stop card in accordance with EN 954-1 (Cat.3)
• Interfacing with the more common field bus: ProfiBus, CANopen, DeviceNet, EtherNet real.time GDNet, EtherCAT, EtherNet/IP