A 100 kW, 200 V, long-shunt commutative compound generator has equivalent armature resistance of 0.03 \Omega and a series field resistance of 0.004 \Omega . There are 1200 shunt turns per pole and 5 series turn per pole. The data of its magnetization characteristic at 1000 rpm is given below:
I_{f}(A) |
0 | 1 | 2.2 | 3.3 | 4.2 | 5.3 | 7.1 |
E_{a}(V) | 11 | 33 | 105 | 150 | 175 | 200 |
225 |
(a) Calculate the terminal voltage and rated output current for shunt field current of 5 A and a speed of 950 rpm. Neglect armature reaction effect.
(b) Calculate the number of series turns per pole for the generator to level compound with same shunt field current, series field resistance and generation speed to be the same as in part (a). The demagnetization due to armature reaction in equivalent shunt field current is 0.001875 I_{a} where I_{a} is the armature current.