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what is tertiary winding in transformer?What is its purpose?
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Answer Posted / amit sharma
In Δ - Δ, Δ -λ and λ - Δ transformers all voltages are
balanced and there is no floating of neutral. The floating
of neutral is developed in the case λ- λ connection only.
The transformers are sometimes constructed with three
windings. The main windings are connected to form λ- λ
connection and the third winding known as tertiary winding
is used to make a closed Δ 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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