Answer / yogesh

Calculate the system connected load.(CL)

Rating of Transformer = (CL*U.F.*M.F.)/(Tran.Effi.*p.f.)

Then consider the loading factor as 80%

as U.F. -Utilisation fsctor & M.F.- Maintenance factor

Answer / virendra joshi

usually transformer rating is based on power to be drawn by
the transformer. however few factor is also play a part
like LF, DF...

For Ex say total Connected load is 820 KW
Maximum Demand would be MD= Total connected Load x L.F (0.8)
xD.F (0.7) = 820 x 0.8 x 0.7 = 459 KW

now considering the load at 0.8 leg PF the kva rating of
the transformer is

KVA required = 459 / 0.8 = 574 Kva say .......600 KVA

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