Answer Posted / raj

Power transformers are used for transmission as a step up
devices so that the I2r loss can be minimized for a given
power flow.These transformers are designed to utilize the
core to maximum and will operate very much near to the knee
point of B-H curve(slightly above the knee point value).This
brings down the mass of the core enormously.Naturally these
transformers have the matched iron losses and copper losses
at peak load (i.e the maximum efficiency point where both
the losses match).
Distribution transformers obviously cannot be designed like
this.Hence the all-day-efficiency comes into picture while
designing it.It depends on the typical load cycle for which
it has to supply.Definitely Core design will be done to take
care of peak load and as well as all-day-efficiency.It is a
bargain between these two points.

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