Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 31, Problem 12RQ
What two devices are used to eliminate the induced voltage produced in the rotor when the field excitation current is stopped?
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What is the excitation current required to obtain the rated voltage at the outp of the generator? What is the percentage of the generator current to its rated value?
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
Derive the equation for the sinusoidal response of second order control system?
Chapter 31 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 31 - What conditions must be met before two alternators...Ch. 31 - How can the phase rotation of one alternator be...Ch. 31 - What is the function of the synchronizing lamps?Ch. 31 - What is a synchroscope?Ch. 31 - Assume that Alternator A is supplying power to a...Ch. 31 - What two factors determine the output frequency of...Ch. 31 - At what speed must a six-pole alternator turn to...Ch. 31 - What three factors determine the output voltage of...Ch. 31 - What are sliprings used for on a...Ch. 31 - Prob. 10RQ
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- Explain No load test or rotational loss test and Blocked rotor test.arrow_forwardExplain with vector diagrams and a graph the effect of excitation on armature current and power factor of a synchronous motor.arrow_forwardExplain just how the synchronous impedance and armature resistance can be determined in a synchronous generator?arrow_forward
- Why small voltage is built up immediately in rotating shunt machine eve without field excitation?arrow_forwardWhat will happen if the back emf drops to zero because the external mechanical load stops the armature from rotating?arrow_forwardExplain the effect of varying excitation upon the armature current and power factor of a three-phase Synchronous motor.arrow_forward
- In hydro generator or hydro alternator which type of rotor is used and why? Option 1: Cylindrical pole rotor type & used for low speed operation Option 2: Salient pole rotor type & due to non uniform air gap used for low or medium speed operation. Option 3: Cylindrical pole rotor type & used for low speed operation Option 4: Salient pole rotor type & due to uniform air gap used for high speed operationarrow_forwardWhat is the mathematical model of a DC motor with describing variables: armature circuit voltage and angular velocity of the motor shaft, after discarding the armature circuit inductance is represented by?arrow_forwardReview/Explain with the aid of sketches the following excitation methods for a synchronous motor. DC EXCITATION, DC BRUSHLESS, AC EXCITATION.arrow_forward
- Which loss in the machine is significant in blocked rotor test and why?arrow_forwardwhat two factors determine synchronous speed?arrow_forward2) the armature windings of a 12-pole DC machine are composed of 72 coils with 10 windings, and the windings are 5the layered wave is yellowish. The Rotor speed is 1000 rpm and the flux value per pole is 25mWb.Resistance of Armature windings, commutation windings and compensation windings is 70mΩ, 10mΩ and5mω. (a) the number of current paths in the machine, (b) the total number of conductors in Armature windings, (c) armature coefficient (constant)arrow_forward
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