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A self-excited. DC shunt generator is rated at 22 kW, 220 V at 1800 rpm. The following data are known about the machine: R,-0.2 Ohms, Rw- 35 Ohms, Re=0 to 300 Ohms. The following table give the open circuit characteristics at 1800 rpm. 4(A) 0 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 VocM) 7.5 93 135 165 186 202 215 222 227 230 The adjustable field resistance of the field coil is adjusted so that the no load voltage is 180 V at 1500 rpm. 1. Determine Rfc 2. Determine the armature, field, load currents and terminal voltage at full load condition. Neglect armature reaction effects 3. Determine the armature, field, load currents and terminal voltage at full load condition, assuming that the effect of armature reaction at full load is equivalent to 0.05 field amperes 4. What additional resistance must be inserted in the field circuit to reduce the load voltage to 160 V at 1600 rpm.

A self-excited. DC shunt generator is rated at 22 kW, 220 V at 1800 rpm. The following data are known about the machine: R,-0.2 Ohms, Rw- 35 Ohms, Re=0 to 300 Ohms. The following table give the open circuit characteristics at 1800 rpm. 4(A) 0 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 VocM) 7.5 93 135 165 186 202 215 222 227 230 The adjustable field resistance of the field coil is adjusted so that the no load voltage is 180 V at 1500 rpm. 1. Determine Rfc 2. Determine the armature, field, load currents and terminal voltage at full load condition. Neglect armature reaction effects 3. Determine the armature, field, load currents and terminal voltage at full load condition, assuming that the effect of armature reaction at full load is equivalent to 0.05 field amperes 4. What additional resistance must be inserted in the field circuit to reduce the load voltage to 160 V at 1600 rpm.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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A self-excited. DC shunt generator is rated at 22 kW, 220 V at 1800 rpm. The following data are known about the machine: R, - 0.2 Ohms, Rw = 35 Ohms, R = 0 to 300 Ohms. The following table give the open circuit characteristics at 1800 rpm. 4(A) 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Voc (V) 7.5 93 135 165 186 202 215 222 227 230 The adjustable field resistance of the field coil is adjusted so that the no load voltage is 180 V at 1500 rpm. 1. Determine Rfc 2. Determine the armature. field, load currents and terminal voltage at full load condition. Neglect armature reaction effects 3. Determine the armature, field, load currents and terminal voltage at full load condition, assuming that the effect of armature reaction at full load is equivalent to 0.05 field amperes 4. What additional resistance must be inserted in the field circuit to reduce the load voltage to 160 V at 1600 rpm.
Transcribed Image Text:A self-excited. DC shunt generator is rated at 22 kW, 220 V at 1800 rpm. The following data are known about the machine: R, - 0.2 Ohms, Rw = 35 Ohms, R = 0 to 300 Ohms. The following table give the open circuit characteristics at 1800 rpm. 4(A) 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Voc (V) 7.5 93 135 165 186 202 215 222 227 230 The adjustable field resistance of the field coil is adjusted so that the no load voltage is 180 V at 1500 rpm. 1. Determine Rfc 2. Determine the armature. field, load currents and terminal voltage at full load condition. Neglect armature reaction effects 3. Determine the armature, field, load currents and terminal voltage at full load condition, assuming that the effect of armature reaction at full load is equivalent to 0.05 field amperes 4. What additional resistance must be inserted in the field circuit to reduce the load voltage to 160 V at 1600 rpm.
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