How to calculate the rated line currents of Primary (High Voltage Side) & Secondary (Low Voltage Side) side of 8 MVA Power Transformer?
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The Name Plate of a 8 MVA Power Transformer. Example:- 3- Phase, 8 MVA Power Transformer with 33/11kv Voltage class, find out the both HV side and LV side voltage ? Solution: Capacity (P)= 8 MVA Higher side voltage (V1)=33 KV or 33000 V Lower side voltage (V2)= 11 KV or 11000 V We know that, P= √3 VI Cosǿ Line current in High Voltage Side: Line Current (I1) = P/(√3X V1) …………………We don’t consider power factor (Cosǿ) in t’xmer = 8 x 10^6 / (√3 X 33000) = 139.96 Amperes Line current in Low Voltage Side: Line Current (I2) = P/(√3X V2) = 8 x 10^6 / (√3 X 11000) = 419.89 Amperes
