Energy Transformer 10–5000 kVA Marine Isolation Transformer 440V 6.6kV for shipboard and shore power systems, manufactured and supplied to USA, Canada, Brazil, UK, Germany, and Australia.

10 kVA – 9000 kVA Marine Isolation Transformer

Power Rating: 10 kVA – 9000 kVA (custom designs available)
Primary Voltage: 440V / 690V / 3.3kV / 6.6kV / 11kV
Secondary Voltage: 220V / 400V / 440V / 690V
Connection Options: Delta – Grounded Wye (standard), Wye – Wye, Delta – Delta, Wye – Delta
Phase: Three-phase, 50/60 Hz
Cooling Type: Dry type (ventilated or cast resin), Air-cooled (AN/AF)
Standards Compliance: IEC 60076, IEC 60092, DNV, ABS, LR, BV, CCS
Certifications: CE, SGS, RoHS compliant, Class F/H insulation
Enclosure: Ventilated dry type or cast resin; NEMA 1 for indoor or NEMA 3R for outdoor; optional IP23 marine protection
Applications: Designed for safe, reliable shipboard and shore power distribution, galvanic isolation, harmonic reduction, and sensitive load protection. Suitable for commercial vessels, offshore platforms, cruise ships, ferries, yachts, and other marine infrastructure across North and South America, Europe, and global markets.

The Marine Isolation Transformer is a vital component in modern shipboard and offshore electrical systems.
It provides complete galvanic isolation between shore and vessel power networks, ensuring safe, stable, and corrosion-free operation in marine environments.

Engineered for long life and reliability, our transformers are designed and tested to IEC 60076, IEC 60092, and DNV / ABS / LR / BV / CCS standards.
They are widely used in commercial vessels, offshore platforms, naval ships, and port shore power systems.

Built for global shipyards and offshore operators, each transformer delivers maximum electrical safety, reduced harmonic distortion, and optimized performance under harsh marine conditions.

Technical Specifications and Design

Specification Description
Rated Capacity 10 kVA – 9000 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
Energy Transformer Marine Shore Power Isolation Transformer 10–5000 kVA 440V 6.6kV with galvanic protection, manufactured and supplied to USA, Canada, Brazil, UK, Germany, and Australia.
3-Phase Marine Isolation Transformer 10–5000 kVA, 440V 690V 6.6kV by Energy Transformer, manufactured and supplied for shipboard and shore power systems in USA, Canada, UK, Germany, Brazil, and Australia.

Core Advantages

  • ⚡ True Electrical Isolation — Eliminates galvanic currents and ensures electrical safety on board.

  • 🌊 Marine-Grade Protection — Designed for vibration, humidity, salt mist, and extreme temperature resistance.

  • 🔌 Shore Power Integration — Perfect for shore-to-ship power transfer and hybrid systems.

  • 🧱 Custom Design Flexibility — Configurable from 10 kVA to 9000 kVA with tailored voltages and cooling options.

  • 🧭 Optimized Efficiency — Low loss, low noise, and stable voltage regulation for marine power networks.

  • 🔒 Full Compliance — Built to international maritime electrical standards and certified by leading classification societies.

Read More：75 kVA 480V Delta Primary to 480Y/277V Secondary Isolation Transformer

Applications

  • Shore-to-Ship Power Connection (Shore Power Transformer)

  • Shipboard Main & Auxiliary Power Systems

  • Offshore Drilling Platforms and FPSOs

  • Cruise Ships, LNG Carriers, Container Ships

  • Naval and Research Vessels

  • Yacht Power Distribution & Port Installations

Learn More：Dry-Type Transformers vs Oil-Filled Transformers

Case Study: Russian Shipyard Tender (9000 kVA Marine Transformer)

In 2024, our engineering team participated in a competitive tender for a 9000 kVA, 6.6 kV Marine Isolation Transformer at a Russian shipyard building a next-generation Arctic LNG carrier.

Our technical proposal was highly rated by the client’s engineering panel for its innovative design, compliance with DNV standards, and optimized cooling and insulation system.
Although the project was not awarded to us due to non-technical factors, our solution was recognized as one of the most technically advanced and cost-efficient among the submissions.

Key Technical Highlights of Our Proposal:

  • Capacity: 9000 kVA, 6.6 kV / 440 V

  • Cooling: AF (Air Forced)

  • Protection: IP44 Marine Grade

  • Core: Low-loss silicon steel core with vibration isolation

  • Features: Anti-condensation heater, moisture control system, reinforced insulation design

This project enhanced our international profile and demonstrated our capability to engineer large-capacity, high-voltage marine isolation transformers that meet global shipyard requirements.

Engineering & Quality Control

Each transformer is produced in our ISO 9001 & ISO 14001 certified manufacturing facility, following rigorous quality procedures:

  • CNC precision winding and vacuum impregnation for superior insulation.

  • 100% routine, type, and temperature-rise testing.

  • Salt-fog, vibration, and humidity tests per IEC 60068.

  • Option for DNV, ABS, or LR witness inspection before shipment.

Every unit is built for long-term reliability, minimal maintenance, and stable power performance in marine and offshore environments.

Why Partner With Us

  • 15+ years of marine transformer engineering experience.

  • Proven track record with international shipyards (Russia, Europe, Middle East, Asia).

  • Full customization service for voltage, power rating, and enclosure design.

  • Certified compliance with global marine electrical standards.

  • Fast delivery and responsive technical support.

FAQ

Q1: What is the function of a Marine Isolation Transformer?
It isolates ship and shore electrical systems, preventing galvanic corrosion and ensuring stable voltage and safety.

Q2: Can I request a custom voltage or kVA rating?
Yes — all transformers can be fully customized in voltage (220 V–11 kV), capacity (10–9000 kVA), and frequency (50/60 Hz).

Q3: Do your transformers meet classification society standards?
Yes. DNV, ABS, LR, BV, CCS certification available on request.

Q4: What is the typical delivery time?
4–8 weeks, depending on rating and certification requirements.

Q5: Can you provide drawings and FAT test reports?
Absolutely. Detailed GA drawings, wiring diagrams, and full factory acceptance test (FAT) reports are provided.

Get a Quote

Looking for a reliable Marine Isolation Transformer manufacturer with proven engineering expertise?
We provide custom solutions from 10 kVA to 9000 kVA, tailored for shipboard, shore power, and offshore applications.

💬 Contact our technical team today for a free consultation or quotation.
Let’s power your vessel with efficiency, safety, and marine-grade reliability.

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