8. What conditions must be fulfilled for the self-excitation of a d.c. shunt generator ? The open-circuit characteristic of a shunt-excited d.c. machine, run at 1200 rev/min, is: 103 114 122 127 135 141 0-4 0-6 0-8 1:0 1-2 1-6 2-0 85 Terminal voltage (V) Field current (A) 47 0-2 The field coil resistance is 55 N. 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 2 and the speed is reduced to 800 rev/min.
8. What conditions must be fulfilled for the self-excitation of a d.c. shunt generator ? The open-circuit characteristic of a shunt-excited d.c. machine, run at 1200 rev/min, is: 103 114 122 127 135 141 0-4 0-6 0-8 1:0 1-2 1-6 2-0 85 Terminal voltage (V) Field current (A) 47 0-2 The field coil resistance is 55 N. 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 2 and the speed is reduced to 800 rev/min.
Introductory Circuit Analysis (13th Edition)
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Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Transcribed Image Text:8. What conditions must be fulfilled for the self-excitation of a d.c. shunt
generator ?
The open-circuit characteristic of a shunt-excited d.c. machine, run
at 1200 rev/min, is:
103 114 122 127 135 141
Terminal voltage (V)
Field current (A)
47
85
0-2
0.4 0-6
0-8 1-0 1-2 1-6 2:0
The field coil resistance is 55 N. 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 2 and the speed is reduced to
800 rev/min.
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