PS7006 Industrial Power System Analysis & Design M.E Question Bank : valliammai.co.in
University : Anna University
Department : Electrical and Electronics Engineering
Subject Code/Name : PS7006-Industrial Power System Analysis & Design
Degree : M.E Power Systems
Year : II
Semester : III
Document Type : Question Bank
Website : valliammai.co.in
Download : https://www.pdfquestion.in/uploads/va…d%20Design.pdf
Valliammai Industrial Power System Analysis Question Paper
Unit I
Motor Starting Studies :
Part-A :
1. Give the classification of polyphase induction motor
2. What are the classifications of squirrel cage induction motor as per NEMA?
3. Draw the torque speed characteristics of squirrel cage induction motors based on design?
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4. State the advantage of full voltage starting?
5. Represent the effects of starting a large motor?
6. What are the criteria for motor starting study?
7. What are the methods used for starting of motor?
8. What are the data related issues for motor in a power system?
9. State the methods for voltage drop calculation?
10. Write the equation for % voltage drop using impedance method?
11. Write the equation for % Voltage drop using short circuit KVA method?
12. Why is R+jX method more accurate?
13. How dose types of load present affect the voltage drop calculation?
14. State how loaded motors at unity power factor affect the voltage drop?
15. How dose leading power factor motor loads affect the voltage drop?
16. State the effect of initial bus voltage on the drop calculation?
17. Write the equation of time required to accelerate the speed?
18. How dose computer aided analysis help in motor starting studies?
19. Write the dynamic equation of the motor starting function?
20. Write the steps involved in the motor starting simulation?
21. What are the output reports obtained from motor starting?
Part-B :
1. Classify squirrel cage motor based on Torque speed characteristics?
2. Present the effects of starting a large motor and explain?
3. Name the starting methods used for large motor and discuss about each in detail?
4. Find the % of tapping required on an auto transformer to start an induction motor against 1/3 of the full load torque, the short circuit current with a normal voltage is 6 times the full load current and the full load slip is 3%?
5. A 3 phase, 6 pole, 60 Hz induction motor takes 60 A at the full load and runs at 1160 Rpm to develop the rated torque. The starting current at rated voltage is 300 A. Calculate the starting torque for online and Y/Delta starting?
6. What are the data related issues for the motor starting in a power system?
7. What are the approaches to calculate voltage drop, explain each in detail?
8. Mention the initial conditions of the power system operation which influence the voltage drop calculation?
9. Give the calculation procedure for acceleration time?
10. Consider a 500 Hp, 460V,1170 rpm,3 phase Induction motor for an application with torque speed characteristics as shown in table .The combined inertia of the motor shaft and the load is 3500lbs-ft2. The short circuit KVA of the system is 35000KVA.The input to the motor at rated load is 450 KVA. Calculate the acceleration time in seconds using a step by step approach?
Unit II
Power Factor Correction Studies :
Part-A :
1. Define power factor?
2. The power factor of a 1000KVA load is 0.8.IT is necessary to improve the power
factor to 0.95. What is the rating of the shunt capacitor bank?
3. Name the power factor correction approaches normally used?
4. What are the assumptions made in power factor case study analysis?
5. What are the factors which ensure satisfactory operation of power factor correction capacitors?
6. How is frequency scan done?
7. How to determine harmonic impedance of a system?
8. Give the equation for steady state voltage following capacitor energisation?
9. Give the switching surge P V values during switching operation?
10. What is insulation co-ordination?
11. What is MCOV capability?
12. Define TRV?
13. What is back to back switching?
14. What are the additional factors that are considered for installation of capacitors?
Part-B :
1. What is power factor? State the Importance of power factor and explain the methods in practice for power factor correction?
2. Discuss the power factor correction capacitor project with the help of case study?
3. Discuss in detail about frequency san analysis?
4. Discuss in detail about Voltage magnification analysis?
5. What is sustained over voltage, Explain in detail?
6. How switching surge analysis is done.
7. Explain back to back switching with the help of a problem
Unit III
Harmonic Analysis :
Part-A :
1. How does advents of converter affect the power systems?
2. What are the sources of harmonics?
3. State the factors contributing the effect of harmonics of system?
4. What are the datas required for harmonic analysis
5. What are the various factors that are to be kept in limit for system harmonics?
6. What are single tuned filters?
7. Represent the variables of the filter used to describe the filter.
8. Draw the single tuned filter with frequency response characteristics.
9. What are high pass filters?
10. Draw the high pass filters with frequency response characteristics.
11. State the purpose of using multiple filter banks.
12. Draw multiple filters and their frequency response characteristics.
13. Give the equation for voltage rise at the capacitor terminals with inclusion of inductor.
14. Define Total Harmonic Distortion (THD).
15. Define Total Demand Distortion (TDD).
16. Give the formula for finding resonant harmonic number.
17. Give the formula for resonant frequency of high pass filter.
18. What is optimal factor? Give its equation.
19. Draw parallel resonant circuit and its frequency response.
20. Draw series resonant circuit and its frequency response.
Part-B :
1. Define harmonics. Name the various sources of harmonics and explain them.
2. What are the important factors contributing to the effects of harmonics on the power systems?
3. What are the general data required to perform power system modeling and computer aided analysis?
4. What are the various acceptance criteria with the limitation of harmonics?
5. What are filters? Explain various filters used for harmonics elimination.
6. Give the various harmonic evaluation terminologies and discuss them in detail.
7. Give a case study on harmonics evaluated using a standard system.
8. A plant is supplied from a 69 kV system through a step down transformer rated to 10 MVA, 69 kV/13.8 kV, delta/wye connected, 8.0% impedance. The step down transformer of the customer is rated to 1 MVA, 13.8kV/480 V, delta/wye connected and 6% impedance. The measured load current at the 480 V level is 900 A. The measured 5th and 7th harmonic currents at the 480 V level (due to converter load) is 100 A and 40 A respectively. Calculate the following : (i) Short circuit current Isc at the point of common coupling at 13.8 kV level.(ii) Short circuit current Isc at the point of common coupling at 13.8 kV level.(iii) Irms at the 480 V level.(iv) TDD at 480 V level.(v) Distortion of 5 harmonic component.(vi) Distortion of 7l harmonic component.(vii) Isc/Iload at the PCC at 13.8 kV level. What is acceptable harmonic level?(viii) Isc/Iload at the PCC at 480 V level. Is this harmonic level acceptable?