10 kVA – 900 kVA Marine Isolation Transformer
Jan 21, 2026
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Product Overview
Marine isolation transformers provide complete galvanic isolation between the shore power grid and the shipboard electrical system. They eliminate stray and circulating currents, protect crew and equipment from earth faults, and prevent corrosion caused by leakage currents passing through the hull and propeller shaft. They are engineered and tested in accordance with IEC 60076 and IEC 60092, and can be built to the rules of classification societies such as DNV, ABS, LR, BV and CCS.
This product range covers ratings from 10 kVA to 900 kVA for merchant vessels, offshore platforms, naval ships, yachts and port shore power systems.
Key Features
True electrical isolation: separates the shore and shipboard networks, eliminating stray currents and improving on-board safety.
Marine-grade protection: insulation and enclosure designed to withstand vibration, moisture, salt spray and extreme temperatures.
Shore power integration: suitable for shore-to-ship power transmission and hybrid power systems.
Custom design flexibility: ratings from 10 kVA to 900 kVA with customizable voltage, vector group and cooling options.
Optimized efficiency: low loss, low noise and stable voltage regulation for shipboard power grids.
Full standard compliance: manufactured to international marine electrical standards and certified by leading classification societies.
Technical Parameters
| Parameter | Typical range / value |
|---|---|
| Rated capacity | 10 kVA - 900 kVA |
| Primary voltage | e.g. 440 V, 690 V, or 6.6 kV / 11 kV for larger units |
| Secondary voltage | 230 V / 400 V / 440 V (customizable) |
| Frequency | 50 Hz / 60 Hz |
| Cooling | AN or AF (dry-type); ONAN (oil-filled) for larger ratings |
| Standards | IEC 60076, IEC 60092-303; class society rules (DNV, ABS, LR, BV, CCS) |
Applications
Shore power connection for vessels at berth (shore power transformers).
On-board main and auxiliary power distribution.
Offshore drilling platforms and FPSOs.
Cruise ships, LNG carriers and container vessels.
Naval and research vessels.
Yacht power distribution and port facilities.
Selection Considerations
Match the rating to the vessel maximum simultaneous load, including the cold-ironing (shore power) demand.
Verify the vector group and the neutral earthing arrangement required by the shipyard and the class rules.
Choose the ingress protection (IP) rating for the installation location: engine room, open deck or enclosed compartment.
Confirm the ambient temperature range and the cooling method for continuous operation in tropical conditions.
FAQ
Q: Why is galvanic isolation needed on ships?
A: It breaks the conductive path for stray currents between shore and ship, preventing corrosion of the hull and protecting personnel from electric shock.
Q: Which standards apply?
A: IEC 60076 for power transformers and IEC 60092-303 for shipboard power systems, plus the rules of the applicable classification society.
Q: Can a marine isolation transformer be used for shore power connection?
A: Yes, shore power transformers are one of the main applications, especially in ports with cold-ironing requirements.
Q: What voltage ranges are available?
A: Typical primary voltages are 440 V, 690 V and 6.6/11 kV; secondary voltages are configurable from 230 V to 480 V.
Q: What is the difference between dry-type and oil-filled marine transformers?
A: Dry-type (cast resin) units are preferred indoors for fire safety and low maintenance; oil-filled units suit larger ratings and outdoor or engine-room installations.