Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 24, Problem 1SQ
In the event of line voltage fluctuations or failure, how is the starter maintained in a closed position?
Expert Solution & Answer
To determine
Explain how the starter is maintained in a closed position during the event of line voltage fluctuations or failure.
Explanation of Solution
If the time is delayed, low-voltage release relay device is used with the magnetic starter and a momentary contact push button station; the motor can automatically reconnect with the power lines after a voltage failure or voltage fluctuations of short duration.
Refer to Figure 24-2 in the textbook, the electrolytic capacitor represented as C1 is charged through the rectifier. If the line voltage fluctuates or fails completely, the electrolytic capacitor can discharge through the control relay to maintain the coil as energized through which the starter can be maintained in a closed position. The discharging time required by the capacitor is a function of resistance in the circuit and capacitance of the device.
Conclusion:
Thus, the process of a starter maintained in a closed position during the event of line voltage fluctuations or failure is explained.
Want to see more full solutions like this?
Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
Students have asked these similar questions
Answer the question one and two step by step with drawing both of using by hand not Ai
I need expe
Part c Assuming no leakage current, calculate the V
min
OH of the inverter. If,
instead, there is a leakage current with equivalent resistance of 3 MΩ
when VGS < VT , determine the adjusted V
min
OH . Calculate the power lost
when Vi =
VT
2
in these circumstances.
I need to figure out how to make an oscilliscope sketch from the VDC and VAC values.
Knowledge Booster
Learn more about
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
- Draw the equation by using Hand not Ai then solve using double integral please i need expert answerarrow_forwardcalculete all the parameters (g11/g12/g21/g22 and r11/r12/r21/r22) for the representations: voltage controlled and current controlled.voltage controlledi1=g11v1+g12v2i2=g21v1+g22v2current controlledv1=r11i1+r22i2v2=r21i1+r22i2arrow_forwardDon't use ai to answer I will report you answerarrow_forward
- calculate the parameters (h11/h12/h21/h22) for hybrid 2 and hybrid 1 HYBRID2 i1=h11v1+h12i2 v2=h21v1+h22i2HYBRID 1v1 = h11i1 + h12v2i2 = h21i1 + h22v2arrow_forwardDescribe the flow control and load sharing features implemented in the MTP3 protocol of SS7. Explain the use of the SLS field and discuss SS7 network structure. Explain the error control mechanisms used in SS7, including preventive cyclic retransmission. Draw a diagram for the protocol model of SS7 and explain the function of each part. List the four classes of SCCP service which are available and explain one briefly. Describe the advantages and disadvantages of common channel signalling. Describe in detail the function of MTP layer 1, 2 and 3. Show the structure of message signal units (MSUS) and describe the fields used. Describe the call control procedures used in DSSI to set up and release a connection. Use a diagram to show the signalling message flows. Give details of three examples of supplementary services provided by the ISDN user part of SS7. Describe a service provided by the transaction capabilities application part. Describe the subscriber line signalling methods used for…arrow_forwardI need to know the derivative of the blocking probability of TSSST switcharrow_forward
- Draw the equation USE BY HANarrow_forwardProblem a. (i) Sketch the ideal power curve of the turbine with the following characteristics: • rated speed is 14 m/s ⚫rated power is 1.25 MW ⚫ cut-in speed is 5 m/s ⚫furling or cut-out speed is 20 m/s (ii) Given part (i), calculate the energy produced in one day if the wind blows continuously between 15 and 20 m/s all day (iii) Can the energy produced in one year be determined if you are told that the average wind speed is 14 m/s? Explain why.arrow_forwardProblem b. Suppose an anemometer mounted at a height of 10 m with a 20-m/s average wind speed (i) Estimate the average wind power at a height of 10 m, assuming Rayleigh statistics and under the following weather conditions • 15°C (ii) Suppose a 1300-kW wind turbine with 60-m rotor diameter is located in those winds with speed computed in the first condition of part (i). Determine the annual energy production with a 30% wind turbine efficiency (iii) Evaluate the wind turbine capacity factorarrow_forward
- Q3/Using Kirchhoff's laws to determine: (6degrees) a) The current (Irsa) b) The voltage across the Ri (V750) c) Calculate the power by each voltage source. d) Calculate the power of each resistor of the network. V3 12V V2 R1 3V R2 1250arrow_forwardQ1/For the network shown in the figure below, Use MESH analysis and find the current through (50) resistor. (6degrees) R. - 3 Ո 20 V R3 ΔΩ Rs ww 50 202 202 w R2 Ra 142arrow_forwardQ2/Using the superposition theorem, find the value of current(la) in the circuit shown. R1 ww 50 V1 60V (degrees) R2 40 R3 w 120 R4 80 11 SAarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Electricity for Refrigeration, Heating, and Air C...Mechanical EngineeringISBN:9781337399128Author:Russell E. SmithPublisher:Cengage Learning
Electricity for Refrigeration, Heating, and Air C...
Mechanical Engineering
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Cengage Learning
Single Phase Induction Motor, How it works ?; Author: Lesics;https://www.youtube.com/watch?v=awrUxv7B-a8;License: Standard Youtube License