When choosing power transformers for energy-saving projects, one of the most important decisions is selecting the right core material. The two main options are amorphous alloy and silicon steel. Understanding their differences can help you make a more informed decision and save significant energy costs over time.

What Is an Amorphous Alloy Transformer?

Amorphous alloy transformers (also called amorphous metal transformers) use a special metallic glass material as the core instead of traditional silicon steel laminations. This material has unique magnetic properties that dramatically reduce energy losses during operation.

The most common type is the SH15 amorphous alloy transformer, which has become the preferred choice for renewable energy projects and rural electrification worldwide.

What Is a Silicon Steel Transformer?

Silicon steel transformers use laminated silicon steel sheets as the core material. This has been the industry standard for over a century. S11, S13, and S20 series transformers all use silicon steel cores.

Key Differences

1. No-Load Loss Comparison

• Amorphous alloy: No-load loss reduced by 60-70% compared to silicon steel
• Silicon steel (S13): Approximately 30% better than S11, but still 3x higher than amorphous
• For a 100kVA transformer running 24/7, amorphous can save 1,000-2,000 kWh per year

2. Cost Comparison

• Amorphous alloy: 20-40% higher initial cost
• Silicon steel: Lower upfront cost
• ROI: Amorphous pays back price difference within 3-5 years

Applications

Choose Amorphous Alloy (SH15) When: Transformer runs 24 hours daily, energy cost is high, solar farm or wind power project, rural electrification, green building certification required.

Choose Silicon Steel (S11/S13) When: Budget is the primary constraint, operating hours are limited, initial purchase cost must be minimized.

Conclusion

If your priority is long-term energy savings, amorphous alloy transformers are the clear winner. The 60-70% reduction in no-load loss translates to significant electricity savings over the transformer's 20-30 year lifespan.

Runsheng Transformer manufactures both SH15 amorphous alloy transformers and S11/S13 silicon steel transformers with full IEC 60076 certification.

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