Power distribution transformers
are used in electric power systems. The final
part of the distribution system at medium
voltage are the power distribution transformers.
Due to the Iow impedance voltage, this type
of power distribution transformer will not
substantially limit the short circuit current
in the case of a fault on its secondary side.
It is therefore common practice that power distribution transformers have to be type tested
to their ultimate short-circuit conditions.
power distribution transformers may be oil
filled (IEC 60076) or dry-type (IEC 60726).
Regularly, a manufacturer offers a complete
range of five power distribution transformers,
which can be certified in one test access
very efficiently.
You use a power distribution transformer when you have no interest in what
happens below the LV terminal of the power distribution transformer. You use a power distribution transformer element if you are interested
in modeling loads or lines on the LV side
of the power distribution transformer. If
you have a node with a power distribution transformer, any loads on that node are assumed
to be applied at the LV side of the power distribution transformer. Modeling the power distribution transformer gives you the benefit of
computed values for secondary voltages, and
transformer losses due to series (or copper)
losses and due to no load (or core energization)
losses.
