Question { Siemens, 21788 }

how kva rating of transformer is calculated.

Answer

First Calculate Kw Load of the plant or system which is connected to that transformer.Load is not directly calculated but calculated accordingly as per plant requirement like Continuous,Intermittent & Standby. After calculating the total load of the System in Kw.For calculate KVA of the transformer we use the Formula
KVA Load of the Tranformer - Total Plant Load Connected to transformer ( In Kw) / Power Factor

For Easy calculation ,we take PF value as 0.8.