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        Q: What is the Use of distribution transformer?
A: 120 kVA , 7000/277 V ( What does this rating mean )  Primary voltage rating : 7000 V and secondary levels voltage rating : 277 V , rated loading : 120 kVA   It 's unclear whether this situation is a single-phase or 3-phase transformer . You presumably required to assume it is single-phase . The equivalent circuit of a three-phase transformer is analysis as one of three single-phase transformers that could to be linked to make the equivalent Y-Y 3-phase transformer . The secondary voltage , 277 V , is the line to neutral voltage for a 480 V , wye distribution networks . That is a USA standard system voltage . The primary would be 12,124 V L-L , 7000 V L-N. That would a reasonable primary distribution networks voltage .   Referring the circuit to the low side means amending the primary component values to the equivalent secondary values and moving the ideal transformer to the primary side of the circuit as displayed below .   To change the primary impedance values , multiply by ( Sec V/Pri V ) ^2 . 

Q: 11/132 Generator Transformer , Is 11 indicates the voltage ratio & 132 kV indicates Capacity of transformer ?
A: Strictly speaking , a transformer 's voltage ratio is the proportion of its primary to secondary rated voltages* , regardless of whether it 's a stepping up , or a stepping down , transformer and , for an ideal transformer , shall be identical as its turns ratio . [ *Often is , however , turns ratio is expressed in regards to high-voltage : low-voltage , e.g . '10:1 ' , regardless of whether it 's steps down or be accelerated . ] 

Q: A 3000 kVA transformer has a ratio of 60 kV to 2.4 kV. Calculate the nominal current of each winding.?
A: You should do your own homework .   But - - - basis ohms = ( basis MVA ^ 2 ) /kV . Using this formula , you are able calculate basis impedance for each winding . Then , multiply these basis impedances by the nameplate % impedance to discouragemine the ohmic impedance alluded to each winding .