Answer / darshan chaudhary

in the transformer there are two winding first is primary
and second is secondory,if third winding is also used in
transformer for specific purpose,that is called tertiary
windingits purpose is that,
(1) it permit third harmonic curret to flow,this reduce
third harmonic voltage
(2)sometimes there is need to interconnected to
three transmission line
(3)for measuring the voltage of HV
testing transformer

Answer / 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.

Answer / adeel qaiser, engineering univ

>ìt provides a voltage level, that can be used inside the
grid station system to do drive domestic load.

>it reduces the fault current if connected in delta.

>it also distribute the fault current through its windings.

Answer / atom faraday

http://www.myelectrical2015.com/2018/03/zig-zag-transformer-advantages.html

Answer / ahsan,tariq

purpose of tertiary winding.

it provides low level voltage for substaion or switchyard,
due to teritary winding we can save extray
expendatures,which will come on trasformer to decrease
vloltage to usefull level.

Answer / mrudang

tertiary winding , when we require low voltage in
switchyard , we use 3 -winding auto transformer
220/132/11 kV
100/125/200 mva

Answer / amit das

IT IS A ADDITIONAL WINDING THAT USED FOR LOW VOLTAGE IN
SWITCH YEARD .

Answer / manikandan

If the abnormal condition (unbalance condition) the tertiary
winding is using to give a balance load.

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