How to estimate the Rating of Transformer

[otomanb]

T/F=Transformer
usually T/F is used according to the load of the area, street etc. How they estimate that 50 KVA transformer is enough for this load,street? any formula or method please explain
::Thanks

 

[sophiecentaur]

The obvious answer is to add up all the loads but that will usually produce a specification which is far too expensive. Not everything is likely to be on at the same time!
I found this paper, which could help you answer your query.
www.inspectapedia.com/electric/ElecAmps.htm