Jawaharlal Nehru Technological University Hyderabad 2010-2nd Sem M.E Power Electronics & Drives M.Tech II- Sester Regular s tember, HIGH VOLTAGE DC TRANSMISSION (POWER ELECTRONICS AND ELECTRIC D

Code No: B5402/D5402
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
M.Tech II- Semester Regular exams September, 2010
HIGH VOLTAGE DC TRANSMISSION
(POWER ELECTRONICS AND ELECTRIC DRIVES)
Time: 3hours Max. Marks: 60
ans any 5 ques.
All ques. carry equal marks
- - -

1. explain in detail about HVDC transmission and EHV AC transmission from
tech. performance, economics and reliability point of view. [12]

2. find an equivalent circuit for rectifier and inverter by deriving relevant
expressions. [12]

3. Why harmonics are generated in HVDC systems and derive an expression for
fundamental value of current for 12 pulse converters. [12]

4. What is meant by individual phase control and provide its drawbacks also discuss the
methods to overcome them. [12]

5. discuss the objective of DC power modulation in detail. [12]

6. explain series multi terminal HVDC system and its control. [12]

7. elaborate the over voltages due to disturbances on AC system side discuss them?
[12]

8. Write short notes on the following:
a) Surge arrestors
b) Commutation failure. [12]

Earning:   Approval pending.