Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 11, Problem 4SQ
Refer to the circuit in Figure 11–10. What is the purpose of control relay CR in this circuit?
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- Using a portable relay to locate an intermittent fault, how does the relay close?arrow_forwardIn what case is it necessary to use time over current relays 51 along with instantaneous relays 50? Comment on the pick-up currents of the two kinds of relays when installed at the same location in the power system.arrow_forwardWhy is the reason of connecting in series a normally open contact of an overload relay and an indicator lamp for fault condition?arrow_forward
- What are typical uses for control relaysarrow_forwardElectrical Enginnering what is protective relaying? what is Time & Setting Multiplier ?arrow_forwarda) Explain how tripping time affect the entire electrical switchgear operation b) in your opinion Is it important in Electrical Power System to measure the fault (time) Why ? c) What is the importance of combining the measuring relay and tripping relay.? d)Explain What is the effect of using intermediate relay (RXME-1) in relay operation.? e) In your own Idea, Is it necessary to combine intermediate relay and measuring relay with another relay Why?arrow_forward
- In developing line or wiring diagrams in which lines should the overload relays be placed for three phase motor startersarrow_forward2. An 11-pin control relay contains three sets of single-pole, double-throw contacts. List the pin numbers by pairs that can be used as normally open contacts.arrow_forwardAll overload relays have two main components. What are these two components?arrow_forward
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