[DC machine with armature reaction] A 300kW, 240V, 900rpm separately excited, non- compensated DC generator is shown in Figure 3(a). The generator has parameters: Ra = 0.002342, Rmerpole = 0.00082, R, = 18.12. The shunt field has 1020 turns/pole, separately excited by DC supply of 120V through a rheostat, Ry. The equivalent demagnetizing ampere-turns caused by armature reaction, when supplying rated load at rated voltage is assumed equal to 12.1% of the shunt field mmf. The magnetization curve is shown in figure 3(b). R, = 18.10 ER=0.002340 V, = 120V Load Ruempole = 0.00082 Figure 3(a) Separately excited DC generator Determine:- a) No load voltage b) Voltage regulation c) Rheostat resistance, R, to obtain rated conditions.

[DC machine with armature reaction] A 300kW, 240V, 900rpm separately excited, non- compensated DC generator is shown in Figure 3(a). The generator has parameters: Ra = 0.002342, Rmerpole = 0.00082, R, = 18.12. The shunt field has 1020 turns/pole, separately excited by DC supply of 120V through a rheostat, Ry. The equivalent demagnetizing ampere-turns caused by armature reaction, when supplying rated load at rated voltage is assumed equal to 12.1% of the shunt field mmf. The magnetization curve is shown in figure 3(b). R, = 18.10 ER=0.002340 V, = 120V Load Ruempole = 0.00082 Figure 3(a) Separately excited DC generator Determine:- a) No load voltage b) Voltage regulation c) Rheostat resistance, R, to obtain rated conditions.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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