January 6, 2012

HVDC Transmission JNTU previous years question papers


HVDC Transmission JNTU previous years question papers

 Time: 3hours
Max.Marks:80
Answer any FIVE questions
All questions carry equal marks


1. What do you understand by characteristic harmonics in HVDC System? Using Fourier analysis obtain equation for primary current of transformers connected to 12 pulse converter. [16]

2. Mention the configurations and impedance characteristics of various types of filters. Give design aspects of single tuned filter. [16]

3.a) Explain the break even distance of D.C. transmission system. Give its range of values for D.C. transmission lines.
b) Explain briefly about different types of HVDC links. [8+8]

4. What are the different harmonics generated in voltage and current wave form on both AC and DC side in case of a 6 pulse converter? [16]

5. Explain the drawbacks in Individual phase control and equidistant pulse control schemes used in HVDC projects. [16]

6. Discuss the various sources of reactive power for HVDC converters. [16]

7.a) Classify the solution methodology for AC-DC load flow and explain.
b) Explain the per unit system for DC quantities. [8+8]

8.a) Explain the difference between the A.C. circuit breaker and H.V.D.C. circuit breaker.
b) Explain the causes of over voltages on D.C. side of H.V.D.C converter. [8+8]

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