Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 42, Problem 4SQ
Under what conditions will the out-of-step relay trip out the control circuit?
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Chapter 42 Solutions
Electric Motor Control
Ch. 42 - What are the two basic methods of automatically...Ch. 42 - What is an out-of-step relay?Ch. 42 - Why is an out-of-step relay used on automatic...Ch. 42 - Under what conditions will the out-of-step relay...Ch. 42 - What is the last control contact that closes on a...Ch. 42 - What influence do both of the polarized field...Ch. 42 - Prob. 7SQCh. 42 - Approximately how much time (in terms of...Ch. 42 - How does the AC coil of the PFR receive the...Ch. 42 - Why is a control relay (CR1) used in Figure 426?...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- What is an out-of-step relay?arrow_forwardWhat is the difference between a fuse and a relay ? What is the difference between an overcurrent relay and current differential relay ?arrow_forwardWhich of the statement is true? A Normally closed (NC) relay contact is open when the relay coil is de – energized. It opens when the coil energizes, but returns to closed position when the coil de – energizes. O b. When a relay contact is normally open (NO), there is an open contact when the relay is energized. O c. A NO relay contact is open when the relay coil is de – energized. It closes when the coil energizes but returns to open position when the coil de – energizes. d. When a relay contact is Normally Closed (NC), there is a closed contact when the relay is energized.arrow_forward
- Why do we use a reactive power control relay? What are the essential factors that should be considered in the choice of the reactive power control relay?arrow_forwardWhy is the shunt field circuit never allowed to open while operating?arrow_forwardWhy does mechanical relay reacts slower in switching compared with two other main types of relay? What are the factors that contributes to its slow switching response?arrow_forward
- What is the role of protective relays in ensuring the safety of power systems?arrow_forwardWhat will happen if the back emf drops to zero because the external mechanical load stops the armature of the coil?arrow_forwardWhat is the principle of operation of a relay and its typical applications in electrical systems?arrow_forward
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