10.9 A 2 MVA, 3.3 kV, 3-phase, star-connected Alternator delivers full-load at 0.8pf lagging and at rated voltage. The effective resistance per phase is 0.15 2. Thefield circuit takes 68 A from 230 V DC supply. Mechanical and iron lossesaccounts for 16 kW and 34 kW respectively. Determine the efficiency of theAlternator at this load condition. [Ans: 92.98%]

Answered: 10.9 A 2 MVA, 3.3 kV, 3-phase,…

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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Generate a conclusion on this following statements: Determine and analyze the voltage regulation characteristics of the alternator with resistive, capacitive, and inductive loading.
The step down DC chopper uses DC source voltage V(dc) = 200 V and resistive load impedance of 10 ohm. The duty cycle is 0.4 the voltage drop across the switch may be taken as zero, Calculate : (a) Average and RMS value of output voltage. (b) Average and RMS value of output current.
A three-phase 3300V. 50 Hz star-connected alternator has an effective resistance of 0.5 ohm/phase. A field current to of 30A produces full-load current of 180A on short- circit and a line to line emf of 1000V on open circit Determine(i) the power angle of the alternator when it delivers full-load at 0.8p.f(lag) (ii)the SCR of the alternator D
Please solve the problem and show the circuit diagram. Thank you. 3. A 5 MVA, 13.2 kv, 3-phase wye-connected alternator has an effective resistance of 0.8 ohm and a reactance of 15 ohms per phase. It delivers full-load current at 0.707 lagging power factor at rated voltage. What will be the terminal voltage for the same excitation and load current, if the power factor is 0.6 leading?
The voltage regulation of an alternator having 0.75 leading p.f. load, no-load induced e.m.f. of 2400V and rated terminal voltage of 3000V is............... percent. *
v. With reference to an 50 Hz3 phase alternator explain how P,Q,V and F are controlled.
A single phase 120V AC sourc controls power to a resistve load 20N using integral cycle control. a) Find the output power for both output voltage waveforms shown below. b) The voltage and the current ratings of the switch. c) The duty cycle and the value of TON to produce 0.63KW power. d) The power factor for part (c). Awww TON -TON
b) Two alternators are connected in parallel to feed a load together. The no-load frequency of the first alternator is 51.5 Hz and its slope is 1MW / Hz. The no-load frequency of the second alternator is 51.0 Hz and its slope is 1MW / Hz. The total power of the load fed by these two alternators is 2.5MW and the power factor is 0.8. Accordingly, at what frequency does this system work and what are the power values transferred to the load by each alternator.
b) Explain the conditions of parallel connection of alternators and how these conditions are fulfilled.
A three phase star connected alternator gives 575 V on open circuit when the field current is 10 A. For same field current, a full load current of 75 A is observed on short circuit. The armature resistance between terminals is 2.16 ohms. On 0.8 leading power factor of full load condition, induced emf per phase is 6000 V. Find its rated terminal voltage between the lines. Also calculate kVA rating of the alternator.
A 60 Hz, 33 kV, 3-phase alternator with earthed neutral has a reactance of 7 ohms per phase and is connected to a bus-bar through a circuit breaker. The distributed capacitance upto circuit breaker between phase and neutral in 0.03 uF. Determine (i) peak re-striking voltage across the contacts of the breaker (ii) frequency of oscillations
Q4 A 11 kV, 500 MVA alternator is connected to a slow C.B. through a bus-bar. Determine the three ratings of the C.B, the average RRRV, and the oscillation frequency knowing that it reaches the peak re-striking voltage with 100 µs time.

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