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 | 5.5 kW Subsea VSD for all motors | 10 kW Subsea VSD for PMSM motors | 55 kW Subsea VSD | 100-400 kW Subsea VSD |
Typical applications |
Actuators - valve operations. Small pumps - lubrication, hydraulics etc.
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Pumps for hydraulics, grease, chemicals, etc.
Inputs for both 3-phase AC (230/400 VAC) and DC (325/560 VDC)
Automatic switching between power sources. |
Active cooling - cool well stream before export or compression. Medium-sized pumps - hydraulics, lubrication, chemicals etc. Complete unit with power distribution and high capacity PLC module for process control.
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ESP (electrical submersible pumping) - downhole pumping. Water injection - for maintaining well pressure. Condensate pumps.
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Status | Qualified. ISO 13628-6. | Qualified. ISO 13628-6/API Standard 17F Ed. 4 (2017)
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Qualified to ISO 13628-6, incl. 1-year+ subsea test. |
Concept development. |
Photo | ![]() |
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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
For more information on Subsea VSDs, please contact: Per Morten Jørum |
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