8. What conditions must be fulfilled for the self-excitation of a d.c. shuntgenerator?The open-circuit characteristic of a shunt-excited d.c. machine, runat 1200 rev/min, is:Terminal voltage (V)Field current (A)4785 103 114 122 127 135 1410-2 0-4 0-6 0-8 1-0 1-2 1-6 2:0The field coil resistance is 55 0, Determine: (i) the value of thefield-regulating resistance to enable the machine to generate 120 V onopen circuit when run at 1200 rev/min; (ii) the value of the open-circuitvoltage when the regulator is set to 20 N and the speed is reduced to800 rev/min.(U.E,I, Q.2)

(a) The following conditions must be fulfilled for DC generator to be self excited: There should be…

8. What generator? The open-circuit characteristic of a shunt-excited d.c. machine, run at 1200 rev/min, is: ns must be fulfilled for the self-excitation of a d.c. sh Terminal voltage (V) Field current (A) 47 85 103 114 122 127 135 141 0-2 0-4 0-6 0-8 1-0 1-2 1-6 2:0 The field coil resistance is 55 Q. Determine: (i) the value of the field-regulating resistance to enable the machine to generate 120 V on open circuit when run at 1200 rev/min; (ii) the value of the open-circuit voltage when the regulator is set to 20 N and the speed is reduced to 800 rev/min.

8. What generator? The open-circuit characteristic of a shunt-excited d.c. machine, run at 1200 rev/min, is: ns must be fulfilled for the self-excitation of a d.c. sh Terminal voltage (V) Field current (A) 47 85 103 114 122 127 135 141 0-2 0-4 0-6 0-8 1-0 1-2 1-6 2:0 The field coil resistance is 55 Q. Determine: (i) the value of the field-regulating resistance to enable the machine to generate 120 V on open circuit when run at 1200 rev/min; (ii) the value of the open-circuit voltage when the regulator is set to 20 N and the speed is reduced to 800 rev/min.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.1P

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