EE6701-High-Voltage-Engineering.pdf - QUESTION BANK SUBJECT...

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QUESTION BANK SUBJECT : EE6701 HIGH VOLTAGE ENGINEERING SEM / YEAR: VII/IV UNIT I - INTRODUCTION SYLLABUS Causes of over voltages and its effects on power system Lightning, switching surges and temporary over voltages, Corona and its effects Reflection and Refraction of Travelling waves- Protection against overvoltage. PART - A Q.NO Questions BT Level Competence 1. Discuss different kinds of over voltages and its causes. 1 Remember 2. Define corona critical Disruptive voltage 1 Remember 3. Define lightning phenomenon 1 Remember 4. Define Isokeraunic level and back flash over 2 Understand 5. List out various schemes of protection against over voltages 2 Apply 6. Define Shielding angle. 2 Understand 7. List the techniques to be adopted for controlling switching 2 Evaluate over voltages? 8. Infer the concept of switching surge? Mention its approximate 1 Apply magnitude and frequency. 9. What are the methods employed for protection of over head 1 Apply lines against lightning 10. Draw the mathematical model of lightning. 1 Remember 11. State the specifications of a travelling wave? 3 Analyze 12. Define surge impedance of a line? 3 Remember 13. Outline the concept you understand from the word “travelling 3 Analyze waves? 14. Define attenuation? How they are caused 4 Analyze 15. List the origin of switching surges? 4 Evaluate 16. List the causes of power frequency over voltages in power 4 Understand system? 17. Mention the specifications of the standard impulse voltage? 6 Create 18. Express the equations for reflection coefficient and refraction 5 Understand co- efficient
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19. Draw the typical wave shape of switching surges. 5 Create 20. What is the use of protective devices? 6 Remember PART - B 1. Explore the mechanism of lightning and mathematical model 2 Evaluate of lightning. 2. Explain the different theories of charge formation in the 3 Apply cloud. 3. Explain the various protection of transmission line against 1 Evaluate different over voltages. 4. Explain various causes of power frequency over voltages in 1 Remember power systems and its control techniques. 5. Derive the expression for velocity of travelling waves on 3 Remember transmission line 6. Discuss elaborately on reflection and refraction of travelling 2 Understand waves 7. Explain the control measures for over voltage due to 2 Analyze Switching surge and lightning over voltages. 8. Give the origin and characteristics of switching surges and 4 Understand explain the causes of over voltage due to switching surges in EHV and UHV system 9. What are the causes for switching and power frequency over 4 Apply voltages? How are they Controlled in power systems? 10. Write short notes on: (a) Rod gaps used as protective devices 1 Create (b) Ground wires for protection of overhead lines 11.
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