IISIJessLeal*Question 3. A 40-kVA, 240-V, three-phase, Y-connected synchronous generator has asynchronous reactance of 0.08 ohms/phase. The armature winding resistance is negligibly small,and the field is established by permanent magnets. The rotational loss (Pr) is 1.7 kW. When thegenerator delivers the rated load at a unity power factor (pf=1), determine (a) the power angle, and(b) the efficiency of this generator.7home

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Answered: IISI Jess Leal * Question 3. A 40-kVA,…

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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With the aid of diagrams describe the basic topology of a wound field 3 phase synchronous generator and outline the relationship between the excitation voltage and rotor current. Q2 (a) (b) Outline with the aid of a suitable diagram the necessary power conversion stages required to interface a small permanent magnet (PM) generator to a stand alone DC system. A star connected 3 phase wound field synchronous generator with a synchronous reactance of 20 N is connected to a 6.6 kV (phase voltage) grid and supplies 1.5 MW at 0.95 lagging power factor at its terminals. Calculate the phase current and resultant voltage across the synchronous reactance (Vxs), and from a scaled phasor diagram graphically determine the required excitation voltage (Eph) and load angle (8). (c) The load is now increased to 3 MW with the Excitation Voltage kept constant. Using the phasor diagram drawn in part (c) graphically determine the resultant phase current, power factor and load angle. (d)
A dc series generator is sipplying a current of 10A to a load trhrough a feeder of total resistance 1.5 ohms. The generated voltage is 550V. The armature and series field resistance are respectively 0.5 and 0.6 ohm respectively. Determine the voltage at the terminal of the generator and at the feeder.
Q2. a) A 415V, 50Hz, 3-phase induction motor supplies its rated power to a load. The rated speed of the motor is 980 rpm. b) Two synchronous generators, G2 and G2, are connected parallelly supplying a load. Generator G1 has a no-load frequency of 50.5 Hz and a slope of 300 MW/Hz. Generator G2 has a no-load frequency of 50.2 Hz and a slope of 500 MW/Hz. The load consumes 250 MW real power. (i) At what frequency does this system operate, and how much power is supplied by each of the two generators? (ii) An additional 100 MW load is added to this power system. What is the new system frequency, and how much power do G1 and G2 supply? (iii) The governor set point of G2 is changed to control system frequency back to 50 Hz. Determine the G2 governor set point.
A 2300V, 1000 kVA, 0.8 lagging power factor, two-pole, 60HZ, Wye-connected, synchronous generator has a synchronous reactance of 1.1 ohms and an armature resistance of 0.15 ohms. Its losses due to friction and friction with the air are 24 kW and its core losses are 18 kW. The field circuit has a dc voltage of 200v and a maximum of 10A. The field circuit current is adjustable in the range of 20 to 200 ohms.The magnetization curve of this generator is shown in the figure below.a) How much field current is required for Vt to equal 2300V when the generator is running without load?b) What is the voltage generated intermittently by this machine at nominal conditions?c) How much field current is needed to make the voltage at the terminals Vt=2300V when the generator works in nominal conditions?d) How much power and torque should the prime mover of the generator be able to supply?
' A three phase, star connected, round rotor synchronous generator is rated 250 MW, 0.85 lagging power factor, 10.8 kV 50 Hz, and 1600 rpm. Each winding has an armature resistance of 1.5 mOHM and a synchronous reactance of 0.5 OHM 1)Determine the induced voltage for the condition of rated load and 0.85 power factor lagging. 2) Draw the phasor diagram with calculated values. 3) Determine the values of theta, gamma, delta, and torque angle

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