Question 4.A 3-phase, 8-pole, 50 Hz, 400 Vrms (line-to-line) Y-connected synchronousmachine has 10 per phase synchronous reactance and 0.5 § stator winding resistance per phase.The machine is connected to an infinite bus (ideal voltage source V₁ = 400 V), and is deliveringVt10 kW, 0.75 power factor (PF) leading.(a) Determine the excitation voltage, power angle and the torque for this condition.(b) Draw the phasor diagram.(c) Suppose the field current is now adjusted to achieve unity power factor with the same inputpower at the terminal. Determine the new power angle to achieve this condition.

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Answered: Question 4. A 3-phase, 8-pole, 50 Hz,…

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 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.
B/A 3 phase, 460v, star connected, 1740 rpm, 60Hz, 4-pole, SRIM. Have the following parameters per phase: R₁-0.2502, R2e-0.292, X₁=Xze=0.592, Xm=3002, the rotational losses are 1700W, Find: a. Starting current when stared direct on full voltage. b. Full load slip. c. Full load current. d. Full load power factor. e. Motor efficiency at full load.
A 60 MVA, 69.3 KV, three-phase synchronous generator has a synchronous reactance Xs = 15 ohm/phase. The generator is supplying its rated power (i.e. 60 MVA) to an infinite bus at 0.8 power factor lagging. Determine: a) The armature current Ia. b) The generator emf per phase (E). c) The power angle. d) The maximum power (P) that the generator can supply. Xs = j 150 la Vline = 69.3 KV
A 34, 5 kVA, 208 V, four-pole, 60 Hz, star-connected synchronous machine has negligible stator winding resistance and a synchronous reactance of 8 ohms per phase at rated terminal voltage. The machine is first operated as a generator in parallel with a 34, 208 v, 60 Hz power supply. Determine the excitation voltage and the power angle when the ma- chine is delivering rated kVA at 0.8 PF lagging.
A non–salient pole, Y-connected, three-phase,two-pole synchronous machine has a synchronousreactance of 7Ω and negligible resistance androtational losses. One point on the open-circuitcharacteristic is given by Vo = 400 V (phase voltage)for a field current of 3.32 A. The machine is to beoperated as a motor, with a terminal voltage of 400 V(phase voltage). The armature current is 50 A, withpower factor 0.85, leading. Determine Eb, fieldcurrent, torque developed, and power angle δ.
A salient-pole generator operates at rated conditions with a 0.8 PF lagging. It has Xd=1pu and Xq=0.7pu. The per-unit values are on generator bases. (a) Find armature voltage and power angle of the generator. (b) Calculate the maximum active power obtained from the generator and the power angle at the maximum active power generation condition when the generator is connected to an infinite bus.
A 2000V 3-phase 4-pole wye connected SM runs at 1800 rpm. The excitation is constant and gives an emf per phase of 1150V. The resistance is negligible compared to the synchronous reactance of 3Ω/. Determine the following when the armature current is 200A. a. Input power per phase b. Torque develops per phase
A 30, 5 kVA, 208 V, four-pole, 60 Hz, star-connected synchronous machine has negligible Stator winding resistance and a synchronous reactance of 8 ohms per phase at rated terminal voltage. The machine is first operated as a generator in parallel with a 30, 208 V, 60 Hz power supply. (a) Determine the excitation voltage and the power angle when the machine is delivering rated kVA at 0.8 PF lagging. Draw the phasor diagram for this condition. (b) If the field excitation current is now increased by 20 percent (without changing the prime mover power), find the stator current, power factor, and reactive kVA supplied by the machine. (c) With the field current as in (a), the prime mover power is slowly increased. What is the steady-state (or static) stability limit? What are the corresponding values of the stator (or armature) current, power factor, and reactive power at this maximum power transfer condition?
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)
The figure shows the label of a Y-connected synchronous generator. According to these tag values, a.Motor voltage ............Is VDC.b.Output electrical active power ..........MW.c.……..phased and........ bipolar.d.Round Rotor/dislocation pole synchronousgenerator (select one of the two.)e.I stimulated the power....... kW.f.Output phase-to-neutral voltage.......VRMs.
Explain the importance of power phase design and VRMs (Voltage Regulator Modules) in motherboard selection for overclocking.
Discuss the double field revolving theory and discuss the equivalent circuit diagram of single phase induction motor

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