Answer / dinesh kumar

the tertiary winding has a power rating below the rated
power rating of the secondary side, it is also called as
"STABILIZING WINDING". it is used for the following reasons:

A) harmonics suppression.
B) reduction of zero sequence impedences.
C) Sometimes the power is taken from it to supply fans and
cooling systems.

Answer / meenakshi

tertiary winding is basically a low kva rating one
connected in delta which is used for getting a sinusoidal
flux by allowing a triple frequency component to flow.for
the output to be sinusoidal, flux must contain the triple
frequency component.
source: theraja

Answer / anurag2023

HARMONICS SUPPRESSION

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