IEEE C57 — Transformer Glossary

North American standard series for power and distribution transformers. The counterpart to IEC 60076 for ANSI/IEEE markets.

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IEEE C57

North American standard series for power and distribution transformers. The counterpart to IEC 60076 for ANSI/IEEE markets.

Key standards: C57.12.00 (liquid-immersed general), C57.12.01 (dry-type general), C57.12.34 (pad-mounted), C57.12.90 (test code for liquid-immersed), C57.12.91 (test code for dry-type). IEEE standards differ from IEC in several areas: temperature rise limits, BIL testing procedures, and efficiency calculation methods. ETS's ability to manufacture and test to both IEC and IEEE standards — rare among global manufacturers — enables supply to both IEC and ANSI markets from a single facility.

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Where this term matters in the ETS portfolio.

transformersUHV Power TransformersUltra high voltage power transformers for 400–765 kV transmission-class applications, leveraging global JV partnerships for units up to 500 MVA.

transformersMedium Power TransformersMedium power transformers for sub-transmission, industrial, and generation applications.

transformersPad Mounted TransformersUL Listed pad-mounted transformers for North American underground distribution.

transformersBESS TransformersBattery Energy Storage System transformers optimised for cyclic loading, harmonic-rich environments, and bidirectional power flow.

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UL ListingCertification by Underwriters Laboratories that a product meets specific safety standards. Mandatory for utility-grade transformers in North America.

DOE Efficiency StandardsUS Department of Energy mandatory minimum efficiency levels for distribution transformers. DOE 2016 is current; DOE 2024 takes effect in 2027.