Problem Solved: Space Constraints and High Heat Load in confined marine engine rooms, minimizing the risk of failure and costly downtime (a key industrial pain point).
The CEEG AFWF marine transformer (Air-Forced Water-Forced) is a specialized, compact water cooled marine transformer designed for high-power demands, such as marine propulsion transformer or converter duty transformer applications, where air cooling alone is insufficient.
System Composition:
The CEEG AFWF (Air-Forced Water-Forced) water cooled marine transformer solution is comprised of two primary physical units and the essential controls:
Transformer Room / Enclosure:
This houses the marine drive transformer core and windings, which is typically a dry-type unit (VPI or cast resin). It is built to high ingress protection standards (e.g., IP44 marine transformer) to protect against the harsh marine environment.
External Cooling Unit (Air-Water Cooler):
This is the heat exchange module responsible for the primary cooling function. It contains the advanced air-water coolers (heat exchangers) and the German fans which force air through the unit to transfer heat from the internal transformer air to the ship's centralized cooling water system.
Integrated Control Box:
This unit houses the necessary sensors, relays, and power electronics to manage the cooling system. It monitors the transformer temperature and automatically controls the speed and operation of the German fans to maintain optimal performance and prevent overheating.
Key Benefits for Industrial Buyers:
| Pain Point | CEEG AFWF Solution |
| Heat & Space | Removes over 90% of heat via water, allowing maximum power output from a minimal footprint. |
| Downtime Risk | The efficient dual-cooling system maintains optimal operating temperatures, significantly extending transformer lifespan and reducing the risk of costly failures at sea. |
| Compliance | Available with certifications from all major classification societies, streamlining procurement and approval processes. |
The result is a low-noise, seismic-resistant marine drive transformer that delivers uncompromising power where traditional air-cooled solutions fail.
Technical Specifications
Feature | Specification | CEEG Advantage |
Rated Voltage | 0.11kV-13.8kV | Covers both 6.6kV/11kV propulsion and 400V/690V auxiliary systems . |
Capacity | 3kVA - 10,000kVA | Scalable for large commercial vessels and offshore platforms . |
Phase Shift | ±7.5° (for 24-pulse) | Native support for 12/24-pulse VFD systems to reduce harmonics . |
Insulation | Class H / Class F | Utilizes DuPont Nomex® paper, safe operation up to 220°C . |
Cooling | AFWF (Air Forced Water Forced) | Solves heat dissipation in enclosed engine rooms . |
Enclosure | IP22, 23, 44 | Enhanced protection against moisture and dust . |
Why CEEG?
Trusted by Leading Marine Propulsion OEMs:
Supplying key transformer solutions to top-tier marine and electric-propulsion companies.
Proven Harmonic Control:
Since 2008, leveraging experience from leading HV/LV inverter manufacturers like Siemens, ABB, and Fuji, CEEG has developed 12-pulse/24-pulse phase-shifting rectifier transformers to effectively suppress harmonics.
Dupont Nomex® H-Class Insulation:
Excellent electrical, thermal, moisture-resistant, safety, and flame-retardant performance.
Built for Harsh Marine Environments:
“Three-Proofing” protection (moisture, salt spray, mold), VPI insulation, and rigid mechanical structures designed to withstand continuous ship vibration.
Certified by the Best:
Type approvals from CCS, BV, DNVGL, ABS, LR, RINA, and NK.
Engineered to meet demanding Conditions:
Propulsion-system requirements—high power density, efficient water cooling, and harmonic tolerance—as well as offshore platform standards (CB/T3528-93) and commercial vessel standards (CB/T4388-2013).
Operating Environment
Ambient temperature: -25°C to 45°C
Relative humidity ≤ 95%
Ship swinging angle ≤ 22.5°, tilt angle ≤ 15°
Conditions include condensation, oil mist, salt spray, and mold
Vibrations and impacts caused by transformers
Product Pictures
Classification Society Certification
Client Assessment Report
Technical Parameters for Reference
Water-Cooled Marine Transformers | |||||
Model | Rated Capacity (KVA) | No-Load Loss (W) | Load Loss (W 75ºC) | No-Load Current (%) | Load Loss (%) |
CS(W/F)D-1000/10 | 1000 | 2210 | 9560 | 1.4 | 6 |
CS(W/F)D-1250/10 | 1250 | 2610 | 11400 | 1.4 | 6 |
CS(W/F)D-1600/10 | 1600 | 3060 | 13800 | 1.4 | 6 |
CS(W/F)D-2000/10 | 2000 | 4150 | 17000 | 1.2 | 6 |
CS(W/F)D-2500/10 | 2500 | 5000 | 20200 | 1.2 | 6 |
CS(W/F)D-3150/10 | 3150 | 5400 | 24000 | 1 | 6 |
CS(W/F)D-3500/10 | 3500 | 5800 | 28000 | 1 | 7.5 |
CS(W/F)D-4000/10 | 4000 | 6500 | 34000 | 0.8 | 8 |
CS(W/F)D-5000/10 | 5000 | 7800 | 40000 | 0.8 | 8 |
CS(W/F)D-6300/10 | 6300 | 8960 | 47000 | 0.6 | 8 |
CS(W/F)D-8000/10 | 8000 | 10220 | 53000 | 0.6 | 9 |
Primary rated voltage (kV): 11, 10.5, 10, 6.6, 6.3, 6, 3.3, 3 or others | |||||
