Answer / omar aziz

Every power transformer has a vector group listed by its
manufacturer. Fundamentally it tells you the information
about how the windings are connected (delta or wye) and the
phace difference betweent the current and voltage. EG.
DYN11 means Delta primary, Wye Secondry and the current is
at 11 o clock reffered to the voltage.

Answer / rajendran

The angle in the specification indicates the phase
difference between primary and secondary quantities and not
between cureent and voltage....

Answer / raj

the primary leakage flux to the secondary leakage flux .
when the secondary currents increase .the primary leakage
flux increases and reactance increases in power transformer
the vector sum of angle is lags behind the voltage.

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