How to choose the right electrical transformer for each application?

Choosing the right transformer ensures an efficient and safe power supply in the marine, industrial and energy sectors.

Types and applications

• Power transformers: stepping voltage up or down in generation and transmission with minimal losses.
• Distribution transformers: supplying urban and industrial networks by adapting voltage to the required operating levels.
• Isolation transformers: improving safety and interference immunity for sensitive equipment.
• Marine transformers: compact solutions resistant to marine environments for vessels and platforms.
• Renewable energy: integrating and stabilising solar and wind power before it is fed into the grid.

Key selection factors

• Power rating, voltages (HV/LV) and frequency (50/60 Hz).
• Vector group and neutral requirements; short-circuit impedance and protection coordination.
• Insulation class, thermal class (for example, F/H), losses and efficiency.
• Cooling method (AN/AF/ONAN/ANAF) and noise level (for example, IEC 60076-10).
• Harmonics and K-factor for non-linear loads.
• Environmental conditions, including humidity, salinity and vibration, as well as IP rating and coatings.
• Applicable standards and certifications: IEC/EN standards (IEC 60076, IEC 61558), CE marking, UL where applicable, and classification society requirements (BV, DNV, etc.) in marine environments.
• Total cost of ownership (TCO): consider losses, maintenance and availability, not just the purchase price.

Recommendations

• Consult specialists to coordinate sizing and protection.
• Implement regular maintenance and, where appropriate, monitoring of temperature, moisture and partial discharge to extend service life.

Conclusion: a transformer matched to its application ensures system efficiency, safety and longevity.