The tertiary winding serves one or more of the following purposes: Feeds lighting, motors, controls at a convenient voltage without a separate transformer. Connects capacitor banks or synchronous condensers on EHV systems via a dedicated winding. This extra winding unlocks powerful capabilities: suppression of triple harmonics, voltage stabilization under unbalance, earth-fault current paths, and a convenient way. Some high-rating transformers use an extra or tertiary winding in addition to their primary and secondary windings. Such transformers are known as tertiary or three-winding types, and have several applications: If a transformer has to supply an additional load which must be insulated from the. A delta connected stabilizing (tertiary) winding provides a path for circulation the third harmonic current by electromagnetic induction. • Also called “Stabilizing” winding – stabilizes neutral point voltage.
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