For a transformer, encapsulation of the windings primarily serves which purpose?

The encapsulation of the windings in a transformer primarily serves to provide electrical insulation. In transformers, it is crucial to maintain a barrier that prevents electrical contact between the windings and other conductive parts, including the core and enclosure. Proper insulation helps to uphold the transformer's efficiency and safety by preventing short circuits, ensuring that the electrical energy is transmitted effectively between the primary and secondary windings without leakage.

Encapsulation also protects the windings from environmental factors such as humidity and dust, which can degrade insulation and affect performance. Without adequate insulation, the risk of electrical failures and hazardous conditions increases significantly. Thus, the primary role of encapsulation is to ensure that the transformer operates reliably and safely over its expected lifespan.