Core Loss (No-Load Loss) — Transformer Glossary

Power dissipated in the transformer core due to hysteresis and eddy currents. Present whenever the transformer is energized, regardless of load.

Backmaterials

Core Loss (No-Load Loss)

Power dissipated in the transformer core due to hysteresis and eddy currents. Present whenever the transformer is energized, regardless of load.

Core losses are constant and represent a 24/7 energy cost for the life of the transformer. They are the primary focus of efficiency standards (DOE, EU Eco Design). Core losses consist of: hysteresis losses (~60%, dependent on core material grade) and eddy current losses (~40%, reduced by thinner laminations). Reducing core losses by using Hi-B steel or amorphous metal cores can yield significant lifetime energy savings — a 1,000 kVA transformer operating for 30 years can save €50,000+ in energy costs with a premium core.

Ready to Specify

Get a Quote Tailored to This Specification

Send us your application context — we'll come back with a sized solution, certified to IEC, IEEE/ANSI or UL, and a delivery slot from our Dubai factory.

Talk to Engineering

CRGO (Cold-Rolled Grain-Oriented Steel)Specialised silicon steel used for transformer cores. The grain orientation minimises magnetic losses.

Transformer CoreThe laminated magnetic circuit that provides the path for magnetic flux between the primary and secondary windings.

Eddy CurrentsCirculating currents induced in conductive materials (core laminations, tank walls, structural parts) by time-varying magnetic flux.