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what is tertiary winding in transformer?What is its purpose?
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Answer Posted / subhajit saha
tertiery winding of a transformer is connected in delta and
having lowest KVA rating.(transformer containing 3 windings
is not having same kva rating for primary and secondery.
Primary kva rating is maximum, tertiary lowest and secondery
intermediate.)
The main advantage is to suppres the 3rd hermonics mainly
generated in case of unbalanced load in a star star
transformer.So as to keep the system stable.
It may also be used to supply substation auxiliaries at a
voltage different of those primary or secondary.
It reduces the impedence offered to the zero sequence
currents to allow sufficient earth fault current for proper
operation of protective relays.
To supply power from two sources where continuity of supply
is required.
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