UNIT III – LIGHTNING TRANSIENTS List out the characteristics features of lightning strokes. What is meant by tower footing resistance? What is meant by arcing ground? What are the various causes of over voltage? Define Lightning Phenomenon – Define Basic Impulse Level – What are the various types of protection afforded by ground wires? Define Dart Leader – Write short notes on stepped leader and pilot streamer. Differentiate lightning over voltages from switching over voltages. Define Overvoltage Factor – State Mason’s theory of lightning. What are the various characteristics of lightning strokes? What are the causes of over voltages in systems? What is meant by over voltage protection? What are the different types of strokes? What is meant by direct lightning strokes? What is the necessity of insulation co-ordination? What are the basic steps involved in insulation co-ordination? What is by back flashover? PART B (16 Marks) Explain in detail, the mechanism of lightning strokes and over voltages on transmission lines. Explain in detail, the different theories of charge formation of thunder clouds. Explain in detail, the charge formation in the clouds. Explain in detail, the interaction of lightning with power system. Explain in detail, the various factors contributing to good line design. Explain in detail, the counter-poise method of protection. 7. Explain in detail, the mathematical models for lightning discharges. 8. Explain in detail, the different characteristics of the lightning strokes. 9. Explain in detail, the mathematical model for lightning discharges. 10. Explain in detail, the principles and functioning of expulsion gaps and protector tubes. 11. Explain in detail, the various techniques of protection of system against lightning. 12. Explain in detail, the mathematical model of lightning.
UNIT – III LIGHTNING TRANSIENTS List out the characteristics features of lightning strokes. What is meant by tower footing resistance? What is meant by arcing ground? What are the various causes of over voltage? Define – Lightning Phenomenon Define – Basic Impulse Level What are the various types of protection afforded by ground wires? Define – Dart Leader Write short notes on stepped leader and pilot streamer. Differentiate lightning over voltages from switching over voltages. Define – Overvoltage Factor State Mason’s theory of lightning. What are the various characteristics of lightning strokes? What are the causes of over voltages in systems? What is meant by over voltage protection? What are the different types of strokes? What is meant by direct lightning strokes? What is the necessity of insulation co-ordination? What are the basic steps involved in insulation co-ordination? What is by back flashover? PART B (16 Marks) Explain in detail, the mechanism of lightning strokes and over voltages on transmission lines. Explain in detail, the different theories of charge formation of thunder clouds. Explain in detail, the charge formation in the clouds. Explain in detail, the interaction of lightning with power system. Explain in detail, the various factors contributing to good line design. Explain in detail, the counter-poise method of protection. 7. Explain in detail, the mathematical models for lightning discharges. 8. Explain in detail, the different characteristics of the lightning strokes. 9. Explain in detail, the mathematical model for lightning discharges. 10. Explain in detail, the principles and functioning of expulsion gaps and protector tubes. 11. Explain in detail, the various techniques of protection of system against lightning. 12. Explain in detail, the mathematical model of lightning.
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