Example-1: Transformer operating separately.

Example-1: For the power system shown below calculate overcurrent and earth fault relay settings in respect of both transformer HV and LV side relays.

Here sample calculations for 50 MVA transformer are shown below using Excel Sheet. Readers are expected to may try it by hand calculations. Also it is expected to try for  25 MVA transformers setting calculations by same way i.e. by Excel Sheet and by hand calculations too.