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what is tertiary winding in transformer?What is its purpose?
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Answer Posted / sri
some more information about tertiary winding
ref:
http://answers.yahoo.com/question/index?qid=20090731083908AADwAY1
One purpose may simply be to provide an additional terminal,
often at a different voltage. While the use of 'three
winding transformers' is relatively unusual, it can be a
powerful tool is system architecture.
The other objective for a tertiary winding is to provide a
closed-circuit path for zero-sequence currents/fluxes. That
is most typically the case with transformers that, for
system reasons, must be connected wye-wye (star-star for
those in the IEC world). With a wye-wye transformer, the
only path for zero-sequence flux is the tank of a
transformer (and if the three-phase bank is comprised of
three single-phase units, even that does not exist). The
tank is a high-impedance path, so the result is that the
zero sequence impedance seen looking into the transformer is
very high. Also, the circulation of zero sequence current
through the tank will cause the tank to heat and lead to
paint failure. A tertiary winding presents a low impedance
path to zero sequence currents, thereby reducing the zero
sequence impedance presented to the outside world, while
avoiding the problem of tank heating.
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