H.W 1- List the advantages of using damper bars in synchronous machines? 2- Why synchronous generator used in steam turbine power station has rotor of small diameter and high length other than that used in hydropower station? 3- Draw the circuit diagram of static excitation system for synchronous generator?

H.W 1- List the advantages of using damper bars in synchronous machines? 2- Why synchronous generator used in steam turbine power station has rotor of small diameter and high length other than that used in hydropower station? 3- Draw the circuit diagram of static excitation system for synchronous generator?

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 single phase synchronous generator was open-circuit and short-circuit tested. During an opencircuit test of the synchronous machine, nominal voltage of 220 V was obtained for the fieldcurrent of IfNL = 6 A while for short-circuit test, rated current of 8 A was reached for the fieldcurrent of IfSC = 5 A. The synchronous generator is connected to rated voltage of 220 V.Assuming negligible armature resistance determine: a. internal voltage E (behind Xs), under rated current and power factor of 0.8 lagging;b. for the internal voltage from (a) determine the steady-state stability limit.Note: Xs is ratio of IfSC / IfNL
if a self-excited dc generator cannot build up the voltage but has NOT lost its residual magnetism, the best course of action is to_____. A. Increase the resistance of the shunt field circuit by increasing the resistance of the shunt field rheostat. B. Reverse the rotation of the prime mover. C. Reverse the shunt field circuit connection. D. Briefly connect the shunt field circuit to an external DC source to strengthen its residual magnetism
An 8 pole DC shunt generator with wave winding has 4800 conductor with 20 turns and average per pole flux is 20 mwb and armature current and armature resistance is 20 A and 0.5 ohm respectively find? (i) Induced emf (ii) Terminal voltage
Explain the operation and control of synchronous generators in a power plant.
A four-pole, Y-connected synchronous generator has a per-phase synchronous reactance of 0.8 ohms, 60 hertz, and 420 volts line voltage. At full load, the armature current is equal to 40 amperes. This generator has core losses of 1.2 kW. Neglect armature resistance. Calculate: • Speed of rotation of this generator in radians per second? • Induced voltage at the armature of this generator if the load power factor is a) 0.7 lagging b) unity c) 0.7 leading • What is the efficiency of this generator if it operates at 0.7 lagging pf? • How much shaft torque must be applied by the prime mover at full load and still at 0.7 lagging pf?
The prime mover driving SG is lost, but the machine remains connected to the large power system and the field supply also remains on. The machine will: Select one: a. get burnt b. behave as a Synchronous Generator with no change c.behave as a synchronous motor and rotate in the same direction d. behave as a synchronous motor but rotate in a reversely
A 15-kV 35-KVA 0.76-PF-lagging 50-Hz four-pole Y-connected steam-turbine generator has a synchronous reactance of 3.50 0 per phase and an armature resistance of 0.75 0 per phase. This generator is operating in parallel with a large power system (infinite bus). a) What is the magnitude of E, at rated conditions? b) What is the generator's torque angle at rated conditions? c) If the field current is constant, what is the maximum power possible out of this generator? How much reserve power or torque does this generator have at full load? d) Sketch the corresponding phasor diagram and calculate for the armature current (assume the field current is still unchanged) e) At the absolute power possible, how much reactive power will this generator be supplying or consuming?
Define the Synchronizing Torque and Damping Torque of a Synchronous Generator using the through explanations and draw the essential curves illustrating the concepts
When the deviation between the stator and the rotor axis in a synchronous generator is measured to be t/3 , comment on the stability of the system-. O infinitely stable stable unstable O critically stable