Power station feeds the following loads:i. alighting load 600KW.ii. Two induction motors, each one with 40OKW at 0.707p.f.iii. A load of 750KW at 0.8 p.f. leading.iv. Synchronous motor, 850KW at 0.8 p.f.v. A synchronous motor driving a 540KW d.c. generator and having an overall efficiency of 90%. The station power factor may become unity if the power factor of synchronous motor is

Power station feeds the following loads:i. alighting load 600KW.ii. Two induction motors, each one with 40OKW at 0.707p.f.iii. A load of 750KW at 0.8 p.f. leading.iv. Synchronous motor, 850KW at 0.8 p.f.v. A synchronous motor driving a 540KW d.c. generator and having an overall efficiency of 90%. The station power factor may become unity if the power factor of synchronous motor is

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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A three-phase, 250 MVA, 16 kV rated synchronous generator is feeding into an infinite bus bar at 15 kV. The generator has a synchronous reactance of 1.62 pu. It is found that the machine excitation and mechanical power input are adjusted to give E = 24 kV and power angle δ = 30◦. a) Determine the line current and active and reactive power fed to the generator terminal. b) The mechanical power input to the generator is increased by 20% from that in part (a) but its excitation is not changed. Find the new line current and power factor. c) With reference to part (a) current is to be reduced by 20% at the same power factor by adjusting mechanical power input to the generator and its excitation. Determine E, angle δand mechanical power input.
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