Electrical Machines Lab
for
B.Tech / B.E /Diploma
&
Electrical And Electronics Engineering
PARALLEL OPERATION OF SINGLE PHASE
TRANSFORMERS
In modern
power distribution systems it becomes inevitable to suffice the increasing load
demand very often, in such cases where there is only one transformer connected
to accomplish this work become insufficient, another transformer is brought
into parallel operation, To maintain the economics and load sharing of these
transformers knowledge of the load shared by this transformer becomes
important.
To bring parallel operation, it needs to satisfy a few set of rules
such as,
Ø Primary windings of the
transformers should be suitable for the supply system voltage and frequency.
Ø Polarity should be maintained
Ø The voltage ratings of both
primaries and secondaries should be identical, as such, transformation ratio.
Ø The percentage impedances should
be equal in magnitude and have the same X / R ratio in order to avoid
circulating current and to operate at different power factors.
Ø To avoid circulating currents,
the equivalent impedances should be inversely proportional to the individual
KVA ratings.
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