Answer Posted / rajesh

Transformer size is decided based on the following factor.
--> Load details
--> Load factor
--> coincidence factor
--> BKW value
--> Other than this it required power factor of the loads.

By using the following formulas we can calculate the
kva rating.
cosф * KW = KVAr

(KVA)2 =( KW)2 +( KVAr)2

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