what is tertiary winding in transformer?What is its purpose?
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Answer Posted / amit sharma
In delta-delta, delta-star and star-delta transformers all
voltages are balanced and there is no floating of neutral.
The floating of neutral is developed in the case star-star
connection only. The transformers are sometimes constructed
with three windings. The main windings are connected to
form star-star connection and the third winding known as
tertiary winding is used to make a closed delta connection
to stabilize the neutrals of both primary and secondary
circuits. The tertiary winding carries the third-harmonic
currents.
HARMONICS are caused because of use of high flux densities
in the core. If the core gets saturated during part of the
sinusoidal wave, then secondary wave will be non-
sinusoidal. This may be due to inadequate core area or
characteristics of core material.
Harmonic currents result in higher copper loss, core loss,
magnetic interference and interference with communication
systems.
Harmonic voltages result in increased dielectric loss,
interference with communication systems and resonance
between inductance of the winding and capacitance of
transmission line.
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