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Note the HT side VOLTAGE,Current,P.F at the same time calculate the L.T side Voltage,current ,P.F.Convert the L.T side V,I,P.F to H.T side by using transformation ratio and calculate the Power in KW for both H.T side and L.T with respect to H.T Then Loss=H.T side power in K.W-L.T side power in K.W with respect to H.T

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