Introduction
The 75 kVA Dry-Type Marine Isolation Transformer 440V to 220V is a premium, oil-free transformer solution designed for shipboard, offshore, and industrial marine electrical systems. Featuring air natural (AN) cooling, high-efficiency epoxy insulation, and robust mechanical design, this transformer provides safe electrical isolation, stable step-down voltage conversion, and reliable operation in harsh marine environments.
Unlike oil-immersed transformers, the dry-type design eliminates the risks associated with oil leaks and fire hazards, making it ideal for ship cabins, control rooms, offshore platforms, and industrial vessels. PowerNex, a leading China-based transformer manufacturer, OEM supplier, and global distributor, delivers this transformer factory-direct to international markets including USA, Canada, Brazil, Argentina, Australia, Indonesia, Malaysia, Philippines, UAE, Saudi Arabia, Russia, Germany, France, South Africa, Venezuela, Mexico, New Zealand, and other regions.
Designed for single-phase and three-phase configurations, this 75 kVA marine isolation transformer supports standard and customized specifications, voltage step-down conversion from 440V to 220V, and optional connection configurations, ensuring reliable power delivery for sensitive shipboard equipment, offshore installations, and industrial marine systems.
Technical Specifications and Parameters
Below is a comprehensive technical specification table for the 75 kVA Dry-Type Marine Isolation Transformer. This table covers more than ten critical parameters, providing clarity for procurement, design, and engineering teams.
| Parameter | Specification | Notes |
|---|---|---|
| Power Rating | 75 kVA | Supports a capacity range of 30 kVA to 5000 kVA for diverse marine applications |
| Transformer Type | Dry-Type, Air-Cooled, Oil-Free | Safe, fire-resistant, minimal maintenance required |
| Phase Configuration | Single-Phase & Three-Phase | Supports small circuits and industrial vessel systems |
| Primary Voltage | 440V AC | Standard shipboard input voltage; customizable |
| Secondary Voltage | 220V AC | Wye or Delta output; step-down voltage conversion |
| Frequency | 50Hz / 60Hz | Compatible with international marine and offshore grids |
| Cooling Method | Air Natural (AN) | No oil, minimal maintenance, suitable for confined spaces |
| Insulation Class | F / H | Epoxy insulation ensures high-temperature tolerance and long life |
| Efficiency | ≥ 98% | Low-loss, energy-efficient continuous operation |
| Voltage Regulation | ±2 × 2.5% Off-Circuit Tap Changer | Precise voltage adjustment for sensitive shipboard equipment |
| Short-Circuit Withstand | High Mechanical & Electrical Strength | Safe under marine short-circuit or fault conditions |
| Operating Environment | -10°C to +45°C, Altitude ≤ 1000m | Optional derating for extreme offshore climates |
| Protection Features | Overtemperature Sensors, PT100/PTC optional | Prevents overheating, ensures crew safety |
| Enclosure | NEMA 1 Indoor / NEMA 3R Outdoor optional | Marine-grade epoxy enclosure for ship cabins, decks, or offshore rooms |
| Certifications | IEC, ANSI, IEEE, CE, UL, cUL, CSA, SGS | Global compliance for shipboard and industrial marine systems |
Key Features and Benefits
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Oil-Free Safety – Eliminates risk of fire, leakage, and environmental hazards.
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Reliable Electrical Isolation – Protects sensitive equipment from ground faults and short circuits.
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Step-Down Voltage Conversion – 440V input to 220V output with optional custom voltages.
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Single-Phase and Three-Phase Options – Suitable for small vessels, ferries, and industrial shipboard networks.
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High Efficiency & Low Loss – Reduces operational cost and energy consumption.
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Marine-Grade Epoxy Construction – Resistant to humidity, vibration, and harsh saltwater conditions.
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Advanced Safety Features – Overtemperature protection, thermal sensors, and insulation monitoring.
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Compact Installation – Ideal for ship cabins, offshore control rooms, and confined deck spaces.
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Global Compliance – Meets IEC, ANSI, IEEE, CE, UL, CSA, SGS standards.
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Customizable and OEM-Friendly – Voltage ratios, enclosures, and branding fully customizable.
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Wide Capacity and Voltage Range – Supports 30–5000 kVA, voltages from 220V to 690V.
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Low Maintenance – Air-cooled dry-type transformer requires minimal intervention.
Applications
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Shipboard power distribution for commercial, naval, and offshore vessels
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Offshore platforms, floating production units, and marine industrial networks
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Backup power and emergency distribution systems on vessels
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Deck machinery, cranes, propulsion motors, and lighting networks
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Sensitive electronics, communication systems, and navigation equipment
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Renewable energy systems on ships, including solar and wind integration
Advantages of Dry-Type Marine Transformers
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Fire-Safe and Environmentally Friendly – No oil required, eliminating fire hazard and leakage.
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Compact and Lightweight – Easier installation in ship cabins, offshore control rooms, and engine rooms.
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Maintenance-Free Design – Eliminates oil checks and reduces long-term operational costs.
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High Reliability – Epoxy insulation and robust construction ensure long-term durability.
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Flexible Deployment – Supports multiple voltages, capacities, and single/three-phase connections.
Global Market and Distribution
PowerNex provides factory-direct marine transformer solutions worldwide. Supported markets include:
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Americas: USA, Canada, Brazil, Argentina, Venezuela, Mexico
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Europe: Germany, France, United Kingdom
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Oceania: Australia, New Zealand
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Middle East & Africa: UAE, Saudi Arabia, South Africa
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Asia: Indonesia, Malaysia, Philippines, Singapore
Customers benefit from OEM customization, technical support, and worldwide shipping, ensuring transformers meet all marine electrical requirements.
FAQ – Frequently Asked Questions
1. What is the primary function of a dry-type marine isolation transformer?
It provides safe electrical isolation, step-down voltage conversion, and protects sensitive shipboard and offshore equipment from faults.
2. Why choose dry-type over oil-immersed for marine applications?
Dry-type transformers are oil-free, fire-safe, low-maintenance, and ideal for confined shipboard or offshore installations.
3. Can the transformer support three-phase systems?
Yes, both single-phase and three-phase configurations are available to match shipboard and industrial requirements.
4. What is the standard voltage rating?
Primary voltage is 440V AC, and secondary voltage is 220V AC. Custom voltage ranges from 220V to 690V are supported.
5. What is the operating temperature range?
-10°C to +45°C, with optional derating for extreme offshore conditions.
6. Are these transformers certified internationally?
Yes, certified to IEC, ANSI, IEEE, CE, UL, cUL, CSA, SGS standards.
7. What are the capacity options?
Supports 30 kVA up to 5000 kVA, covering small vessels to large offshore installations.
8. Can these transformers be customized?
Yes, PowerNex offers full OEM services including voltage ratios, enclosure types, and branding.
9. Is cooling required?
No additional cooling is needed; air-natural (AN) cooling is sufficient for dry-type designs.
10. Where can these transformers be shipped?
Global shipping to USA, Canada, Brazil, Argentina, Australia, Indonesia, Malaysia, Philippines, UAE, Saudi Arabia, Russia, Germany, France, South Africa, Venezuela, Mexico, New Zealand, and more.
11. How long is the service life?
With high-quality epoxy insulation and marine-grade construction, service life exceeds 20 years under normal operating conditions.
12. Can it be installed in confined spaces on ships?
Yes, the dry-type design is compact and ideal for cabins, control rooms, and offshore platforms.
Conclusion
The 75 kVA Dry-Type Marine Isolation Transformer 440V to 220V by PowerNex is a high-efficiency, safe, and reliable marine transformer. With oil-free operation, single-phase and three-phase configurations, customizable specifications, and global certification compliance, it is ideal for shipboard, vessel, offshore, and industrial marine electrical systems. Capacities from 30 kVA to 5000 kVA and voltages from 220V to 690V make it versatile for any marine power distribution application. PowerNex offers factory-direct pricing, OEM customization, and worldwide shipping, ensuring your vessels and offshore platforms receive safe, stable, and reliable electrical power.
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