Question

Example 7.3 A 100-kW, 250-V, 400-A, long-shunt compound generator has an armature resistance (including brushes) of 0.025 ?, a series-field resistance of 0.005 ?, and the magnetization curve of Fig. 7.14. There are 1000 shunt-field turns per pole and three series-field turns per pole. The series field is connected in such a fashion that positive armature current produces direct-axis mmf which adds to that of the shunt field. Compute the terminal voltage at rated terminal current when the shunt-field current is 4.7 A and the speed is 1150 r/min. Neglect the effects of armature reaction. Practice Problem 7.3 Repeat Example 7.3 for a terminal current of 375 A and a speed of 1190 r/min.

          Example 7.3
A 100-kW, 250-V, 400-A, long-shunt compound generator has an armature resistance (including brushes) of 0.025 ?, a series-field resistance of 0.005 ?, and the magnetization curve of Fig. 7.14. There are 1000 shunt-field turns per pole and three series-field turns per pole. The series field is connected in such a fashion that positive armature current produces direct-axis mmf which adds to that of the shunt field.
Compute the terminal voltage at rated terminal current when the shunt-field current is 4.7 A and the speed is 1150 r/min. Neglect the effects of armature reaction.
Practice Problem 7.3
Repeat Example 7.3 for a terminal current of 375 A and a speed of 1190 r/min.

Example 7.3
A 100-kW, 250-V, 400-A, long-shunt compound generator has an armature resistance (including brushes) of 0.025 ?, a series-field resistance of 0.005 ?, and the magnetization curve of Fig. 7.14. There are 1000 shunt-field turns per pole and three series-field turns per pole. The series field is connected in such a fashion that positive armature current produces direct-axis mmf which adds to that of the shunt field.
Compute the terminal voltage at rated terminal current when the shunt-field current is 4.7 A and the speed is 1150 r/min. Neglect the effects of armature reaction.
Practice Problem 7.3
Repeat Example 7.3 for a terminal current of 375 A and a speed of 1190 r/min.

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