Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 14, Problem 2SQ
What are the hazards of phase failure and phase reversal?
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Electric Motor Control
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- The amplitude of the sinusoidal symmetrical ac component of the three-phase short-circuit current of an unloaded synchronous machine decreases from a high initial value to a lower steady-state value, going periods through the stages of __________ and ________ periods.arrow_forwardDescribe the concept of fault analysis in power systems. What types of faults can occur, and how are they mitigated?arrow_forwardWhat are the uses of three-phase transformers?arrow_forward
- In the field circuit model of a DC machine, a variable _____ is usually inserted in series with the field winding to vary/control the _____ that flows through that circuit. A resistor, voltage B resistor, current C inductor, current D inductor, voltagearrow_forwardWhat is the difference between OLTC and transformersarrow_forwardThe reactance of the synchronous generator after sometime of the fault cleared is ............arrow_forward
- What are the conditions for the parallel operation of 1-phase transformers?arrow_forwardWhat are the poles according to their duties? What is a camper? What are the protection duties of surge arresters? to the linesWhat are the related concepts? What are the types of losses in diaelectric? In the detection of partial dischargesWhat are the non-destructive control methods? explain in detailarrow_forwardList and describe three (3) losses that occur in power transformers.arrow_forward
- Question: Find out the appropriate protection schemes for stator winding protection of alternator. Analyze the protection schemes for internal and external LLL and LLG faults.arrow_forwardIn 2-pole machines: the wave winding have greater generated voltage than *.the lap winding armatures True False *.For high rotating speed machines the number of poles must be Little True False The reactance voltage is added in the coil undergoing commutation to * reduce the spark True Falsearrow_forwardUDng a ITIe Core in high frequency transformers. c- Discuss, different applications of iron cores of different hysteresis loops. d- Explain the effect of Inrush current on power transformers.arrow_forward
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