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How to calculate transformer capacity requirement for a
project site?
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Answer Posted / sunil biswal
Calculate all connected loads(KW) Assume Fans as 65Watt,15A sockets as 1000Watt, 5A Sockets at 1ooWatt, TV at 120 Watt Computer at 120Watt, Printer/Scanner/Copier at 1000Watt, A/C 1.5 Ton at 1.5KW
Apply diversity Factor since all loads will not be working at the same time always
Divide the single phase loads into 3 parts. (KW)
Then add three phase loads and i/3rd single phase loads(KW)
add 20% extra to this calculated gross KW
Divide by power factor 0.8 to get KVA Rating of transformer.
At this point you may add another 20% to the rating as a factor of safety and reliability since most machine work comfortably at 75 to 80% loading
Now decide the actual rating of transformer in proper slab as the standard ratings transformer are available in are 10KVA,16KVA,25KVA,63KVA,100 KVA, 125KVA, 160KVA, 200KVA, 250KVA, 500KVA in 11KV range.
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