Oil Transformer
Oil-Immersed Transformer Selection Guide
By Ziyao Engineering Team2026-05-1510 min
Oil-Immersed Transformer Guide
Oil-immersed transformers use mineral oil for insulation and cooling. Common series include S11, S13, S20, and S22 with progressively lower losses.
Selection Criteria
- S11: Standard efficiency, economical choice
- S13: Improved core material, -20% no-load loss
- S20: Low-loss design for utility distribution
- S22-M: Ultra-premium, MEPS Tier 2, -40% loss
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