Answer / manish meena

tertiary winding used for,
-to obtain additional voltage
-to stabilize neutral in case of star/star transformer
-to reduce third harmonics and control zero sequence
impedance.

Answer / vipin

its for eliminating the harmonics

Answer / jnanesh

In star connected trans. third hormonics is significant so
to reduce that effect it is used.In delta connected trans.
third hormonics circulate witin and there is no effect.
Also plz note that in some substation for feeding internal
power to substation or local area this additional winding
is used.

Answer / sunil

it is used for reducing third harmonics currents

Answer / ajay patel

How your tertiary Winding is connected? what is the rating?
If all three phase terminals are bruoght out then it can be
used as additional seondary winding. But If this tertiary
is connected in Open Delta & 2 termianls of open delta
brought our for Earthing. That means this is installed for
Harmonic purpose. If you have rectifier, Big VFDs or such
load which can generate Theird Harmonic in big amount then
these third harmonic can be reflected in entire Grid, if
your transformer is Star - Star. Which is may damage other
equipments / consumers also who are connected with same
supply. Hence it is necessory to control 3rd harmonics in
grid. For this you can provide Delta Primary for
Transformer. But you dont have delta in primay tehn you
have to provide Tertiary winding with open Delta. This Open
delta is closed out side of Transformer & Complete Delta is
formed. This Delta winding should be earthed to minimise
harmonic disturbance in the system. Please check, do you
have earthed tertiary? Is it in Delta?

Answer / manish jauhari

Any unbalanced loads, results in increased cirulating
current with in tertiary Delta winding, thereby keepinng
pri & sec voltages with in limits.

Answer / engr. l. o. osuji

Hi Paliwalsureshi,
Makers of such transformers usually provide a tertiary
winding connected in delta. This winding is sometimes called
compensating winding. As others have rightly said this
winding help to eliminate the harmoics which may interfer
with communication in power system. Before the advent of
microprocessor-based differential relays the old
differential scheme with star-star on one must have a delta
winging in between.In a nutshell any star-star connection
must have a delta tertiary.

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