10 kVA – 900 kVA Marine Isolation Transformer

Marine isolation transformers are critical components in modern marine and offshore power systems.They provide complete electrical isolation between shore power grids and shipboard power grids, ensuring safe, stable and corrosion-free operation in marine environments.

 

Our transformers feature a long design life and high reliability, and are engineered and tested in compliance with IEC 60076, IEC 60092 as well as DNV/ABS/LR/BV/CCS standards.They are widely used in merchant vessels, offshore platforms, naval ships and port shore power systems.

 

Exclusively built for shipyards and offshore operators worldwide, each transformer delivers maximum electrical safety, reduced harmonic distortion and optimized performance in harsh marine conditions.

 

 

⚡ True Electrical Isolation – Eliminates stray currents and ensures on-board electrical safety.

🌊 Marine-Grade Protection – Engineered to resist vibration, moisture, salt spray and extreme temperatures.

🔌 Shore Power Integration – Ideal for shore-to-ship power transmission and hybrid power systems.

🧱 Custom Design Flexibility – Configurable from 10 kVA to 900 kVA, with customizable voltage and cooling options.

🧭 Optimized Efficiency – Delivers 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.

 

 

• Shore power connection (shore power transformers)
• On-board main and auxiliary power systems
• Offshore drilling platforms and FPSOs
• Cruise ships, LNG carriers, container vessels
• Naval and research vessels
• Yacht power distribution and port facilities

 

Learn More:Dry-Type Transformers vs Oil-Filled Transformers: Which One Is Right for Your Project in North America or Europe?

 

 

In 2025, our engineering team participated in a competitive tender launched by a leading European shipyard for a 900 kVA, 6.6 kV marine isolation transformer, custom-designed for its new generation of Arctic offshore support vessels operating in ultra-low temperature polar waters.

 

Our technical proposal was highly commended by the client's engineering review panel for its innovative thermal insulation design, full compliance with DNV Polar Class standards, and an optimized energy-saving cooling system tailored for extreme cold environments. While the final award was made to a local supplier due to regional procurement policies, our solution was unanimously recognized by the tender evaluation committee as the most technologically advanced and cost-effective option among all submissions.

 

Key Technical Highlights of Our Proposal

• Capacity: 900 kVA, 6.6 kV / 440 V
• Cooling Method: AF (Forced Air)
• Protection Class: IP44 Marine Grade
• Core: Low-loss silicon steel core with anti-vibration function
• Special Features: Anti-condensation heater, intelligent humidity control system, reinforced polar-grade thermal insulation structure, low-temperature resistant cable and connector assembly

 

This project further enhanced our international reputation in the high-end marine transformer market and demonstrated our proven capability to engineer large-capacity, high-voltage marine isolation transformers that meet the stringent operational requirements of global shipyards for extreme marine environments.

 

 

Every transformer is manufactured in our ISO 9001 and ISO 14001 certified production facilities, adhering to strict quality control procedures:

• CNC precision winding and vacuum impregnation process for superior insulation performance.
• 100% routine, type and temperature rise tests conducted for all units.
• Salt spray, vibration and humidity tests in accordance with IEC 60068 standards.
• Optional witnessed inspections by DNV, ABS or LR prior to delivery.

All equipment is designed for long-term reliable operation, minimal maintenance and stable power performance in marine and offshore environments.

 

Over 18 years of engineering expertise in marine transformers.

A proven track record with international shipyards across Russia, Europe, the Middle East and Asia.

Comprehensive customization for voltage, power rating and enclosure design.

Certified compliance with global marine electrical standards.

Fast delivery lead times and responsive technical support.

 

 

Q1: What is the function of a marine isolation transformer?

It isolates the shipboard and shore electrical systems, prevents galvanic corrosion, and ensures stable voltage and operational safety.

 

Q2: Can I request custom voltage or kVA ratings?

Yes – all transformers can be fully customized for voltage (220V-11kV), capacity (10-900kVA) and frequency (50/60Hz).

 

Q3: Are your transformers compliant with classification society standards?

Yes. DNV, ABS, LR, BV and CCS certifications are available upon request.

 

Q4: What is the typical delivery time?

4-8 weeks, depending on the rating and certification requirements.

 

Q5: Can you provide drawings and Factory Acceptance Test (FAT) reports?

Absolutely. We provide detailed general arrangement drawings, wiring diagrams and a complete FAT report for all units.

 

Get A Quote

Looking for a reliable manufacturer of marine isolation transformers with proven engineering expertise?We offer custom solutions from 10 kVA to 900 kVA for marine, shore power and offshore applications.

 

💬 Contact our technical team now for a free consultation or quote.Power your marine projects with our efficient, safe and reliable marine-grade power systems.

Request A Quote

 

Technical Specifications and Design

Specification	Description
Rated Capacity	10 kVA – 900 kVA
Primary Voltage	440V / 690V / 3.3kV / 6.6kV / 11kV
Secondary Voltage	220V / 400V / 440V / 690V
Frequency	50Hz or 60Hz
Phase Configuration	1-Phase or 3-Phase
Cooling System	AN (Air Natural) / AF (Air Forced)
Insulation Class	F or H
Protection Grade	IP23 – IP44
Efficiency	≥ 98%
Material	Marine-grade coated steel or stainless steel enclosure
Standards & Certificates	IEC 60076, IEC 60092-301, DNV, ABS, LR, BV, CCS