Primary Winding — Transformer Glossary

The winding connected to the power source (input side) of a transformer. It receives electrical energy and creates a magnetic field in the core.

Backelectrical

Primary Winding

The winding connected to the power source (input side) of a transformer. It receives electrical energy and creates a magnetic field in the core.

The primary winding is typically the high-voltage (HV) winding in step-down transformers. The number of primary turns, combined with the core cross-section and operating frequency, determines the voltage-per-turn ratio. In power transformers, the primary winding is usually disc-wound with interleaved cooling ducts. The primary winding is always the outermost winding in concentric designs, positioned furthest from the core for optimal insulation clearances.

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InductanceThe property of a conductor by which a change in current induces an electromotive force (EMF) in the conductor itself or in a nearby conductor.

Secondary WindingThe winding connected to the load (output side) of a transformer. It receives energy from the magnetic field created by the primary winding.