Calculate generated emf, copper losses and efficiency., Electrical Engineering

Q. A shunt generator gives full load output of 30 kW at a terminal voltage of 200V. The armature and field resistance are 0.05? and 50? resp.. The iron and friction losses are 1000 W. Calculate

   (1) generated emf      (2) copper losses    (3) efficiency




                                V = 200 V, P = 30 × 103 W,Ra = 0.05 W, Rsh = 50 W


                             Pi+f = 1000 W


                                  I = P/V = 30 × 103/200 = 150 Amp


                                 Ish = V/Rsh = 200/50 = 4A


                                 Ia = I +Ish = 150 + 4 = 154 Amp


       (a)                      E = V + Ia Ra = 200 + 154 × 0.05 = 207.7 volt


       (b)                     Copper losses = Ia2 Ra + Iash Rsh


                                                        = (154)2 × 0.05 + (4)2 × 50 = 1985.8w

(c)                   Efficiency ? = Output/ Output + Copper losses + iron losses + friction loss 


                   = 30 × 103/30 × 103 + 1985.8 + 1000 = 90.95%


Posted Date: 7/23/2012 1:39:43 AM | Location : United States

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