Eddy Currents — Transformer Glossary

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

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Eddy Currents

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

Eddy currents generate I²R losses that produce unwanted heating. In the core, they are minimized by using thin laminations (0.23 mm Hi-B vs 0.35 mm standard) with insulating coatings. In the tank, magnetic shunts redirect stray flux away from steel walls. In windings, transposed conductors (CTC — Continuously Transposed Conductor) reduce eddy current losses in large power transformers. Eddy current losses increase with the square of frequency and conductor thickness.

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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.

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.