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Name of the College : Valliammai Engineering College
University : Anna University
Department : Electrical and Electronics Engineering
Subject Code/Name : PS7103-Electrical Transients In Power System
Degree : M.E Power Systems
Year : I
Semester : I
Document Type : Question Bank
Website : valliammai.co.in

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Valliammai Electrical Power System Question Paper

Unit-I

Part-A :
1. What are the causes of transients?
2. Name the different types of transients?
3. What is meant by current chopping?

Related : Valliammai Engineering College PS7102 Power System Operation & Control M.E Question Bank : www.pdfquestion.in/2799.html

4. What is meant by striking distance?
5. Mention any four causes of switching surges?
6. What are the parameters in Lightning flash
7. What is meant by Substation grounding grid?
8. What is extended grounding system?
9. What is meant by current Suppression?
10. What is meant by dart steamer?

11. Define frequency oscillation in lightning flash?
12. How to classify the grounding for protection against lightning?
13. What are the causes of transients?
14. Name the different types of transients?
15. What is meant by current chopping?
16. Mention any four causes of switching surges?

Part-B :
1. write short notes on cloud formation? (8)
2. Explain the mechanism of Lightning discharge? (8)
3. Explain the parameters of lightning flash? (16)
4. What is the function of protective shadow? (8)
5. How to calculate the striking distance? (8)
6. Explain Dynamic tower footing resistance? (16)
7. Explain Direct lightning strokes to overhead lines, with shieldWires. (16)
8. Explain Direct lightning strokes to overhead lines, without shieldWires. (16)
9. Explain steady-state tower footing resistance? (16)
10. Explain Electrogeometric model for lightning strike?
11. Explain Direct lightning strokes to overhead lines, without shieldWires. (16)
12. What happened, when steppep leader striking different object.and explain neat diagram (16)
13. Explain Direct lightning strokes to overhead lines, with shieldWires (16)
14. Explain Pilot Streamer and stepped leader of the lightning flash (8)
15. Explain the Mechanism of the stepped leader? (8)
16. Explain the striking distance of lightning flash? (8)

Unit-II

Part-A :
1. What are the parameters in Lightning flash?
2. What is meant by Substation grounding grid?
3. What is meant by Switching Surges?
4. What are the phenomenon in switching transients
5. What is gap-factor?
6. What is External Insulation?
7. What is Air density correction factor?
8. Draw the Equivalent circuits for line-to-line fault?
9. What are the parameters in Lightning flash?
10. What is Ferroresonance
11. What is Leader progression method?
12. How the Insulation of an electric power system classified?
13. What is Kd
14. Draw breakdown phenomenon of a rod-rod air gap? ?
15. What are the parameters in Lightning flash?
16. What is CFO?

Part-B :
1. Explain the concept of Switching transients? (16)
2. Mention the phenomenon in Switching transients? (16)
3. What is the function of protective shadow? (8)
4. How to calculate recovery voltage in compound Transient? (8)
5. Explain simulation of switching transients? (16)
6. Explain overvoltages caused by load rejection under switching surges?
7. Explain the Physical Mechanism of Air Breakdown ? (8)
8. Explain the performance of External Insulation under Switching surges? (16)
9. Explain Gap factor method and leader progression method? (16)
10. Explain single line-to-ground fault under Switching surges? (16)
11. Compute sequence impedances of switching surges? (16)
12. Explain Critical Flashover Voltage of External Insulation (16)
13. Explain the Physical Mechanism of Air Breakdown ? (8)
14. Explain Flashover voltage under phase-to-phase switching surge? (8)
15. Explain the performance of Internal Insulation under Switching surges? (6)
16. Explain Control of Switching Surges? (10)
17. Effects of Atmospheric Condition on Switching Surges? (8)
18. .Explain Phase-to-Phase Switching Surges? (8)
19. Explain Load rejection under Switching surges? (8)
20. Explain VFTO of Switching Surges? (8)
21. Explain line-to-line fault in switching surges? (16)

Unit-III

Part-A :
1. What isvoltage reflection coefficient ?
2. What is the gap configuration for rod-plane and rod-rod?
3. What is incident wave?
4. What is backward wave?
5. What is voltage reflection coefficient ?
6. What is the gap configuration for rod-structure and conductor-rod?
7. At what we call transmission line as distortionless?
8. Draw Equivalent circuit of a differential-length line segment?

Part-B :
1. Explain reflection and refraction of transmission waves? (16)
2. Explain Attenuation and Distortion (8)
3. Explain Lattice diagram? (8)
4. Explain multi-conductor system of travelling waves in transmission lines? (16)
5. Explain multi-velocity waves of travelling waves in transmission lines? (16)
6. Derive Wave equation of travelling waves in transmission lines? (8)
7. Explain Attenuation and Distortion? (8)
8. Explain Lattice diagram? (16)
9. Explain multi-conductor system of travelling waves in transmission lines? (16)
10. Explain multi-velocity waves of travelling waves in transmission lines? (16)