EE1003 – POWER SYSTEM TRANSIENTS QUESTION BANK ALL UNIT IMPORTANT 16 MARKS

PART-B (16 marks)

UNIT – I

1. Explain the various types of power system transients.
2. Explain the effects of transients on power system.
3. Briefly explain the importance of study of transients in planning.

UNIT – II

1. Explain with appropriate waveform,

(i)                  Current suppression.

(ii)                Current chopping

(iii)               Capacitance switching with one and multiple restrikes.

(iv)              Ferro resonance.

2. Explain in detail about,

(i)                  Resistance switching and

(ii)                Load switching with their equivalent circuits.

3. Explain the load switching in both normal and abnormal conditions with neat sketches.
4. What is capacitance switching? Explain in briefly the effects of source regulations and capacitance switching with a restrike.

UNIT – III

1. Discuss the mechanism of lightning strokes and over voltages on transmission lines.    
2. Discuss the different theories of charge formation of thunder clouds.
3. Explain in detail how the charges are formed in the clouds.
4. Discuss the interaction of lightning with power system.
5. What are the factors contributing to good line design?
6. Explain the counter-poise method of protection.

      7. (a) Give the mathematical models for lightning discharges and explain them.              

          (b) Explain the different characteristics of the lightning strokes.

UNIT – IV

1. Discuss transient response of systems with series and shunt lumped parameters and distributed lines.
2. With neat sketch explain Bewley’s Lattice diagram.
3. Derive the reflection and refraction coefficients of a traveling wave.
4. Write short notes on standing waves and natural frequency.
5. Explain the various type of traveling wave concept in step response.

UNIT – V

1. Explain short line kilometric fault.
2. What is line dropping and load rejection? Explain.
3. Explain switching surges on integrated system.
4. Explain EMTP for transient computation.
5. Explain the over voltage induced by faults.