Download JNTUA B.Tech 4-2 R13 2018 April 13A02803 HVDC Transmission Question Paper

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Code: 13A02803


B.Tech IV Year II Semester (R13) Regular & Supplementary Examinations April 2018
HVDC TRANSMISSION
(Electrical and Electronics Engineering)

Time: 3 hours Max. Marks: 70

PART ? A
(Compulsory Question)

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1 Answer the following: (10 X 02 = 20 Marks)
(a) What is break even distance?
(b) What is meant by static conversion?
(c) Define the pulse number of a converter.
(d) What is meant by commutation of valve?
(e) Differentiate PFC and PPC schemes.
(f) List high level controllers for converter station.
(g) Define non characteristic harmonics.
(h) List the types of AC filters.
(i) What is meant by ?Arc through??
(j) What are the disturbances on the DC side of converter station?

PART ? B
(Answer all five units, 5 X 10 = 50 Marks)

UNIT ? I

2 With a neat schematic, describe the purpose and applications of converter station components.
OR
3 Explain power handling capabilities of HVDC transmission links.

UNIT ? II

4 Explain the operation of 12-pulse converter with no firing delay.
OR
5 Describe the operation and commutation sequence of a 3-pulse converter station.

UNIT ? III

6 Describe the hierarchical control structures used in HVDC link control.
OR
7 Explain the basic characteristics of converter control.

UNIT ? IV

8 What are AC filters in DC converter stations? Explain their role in control of DC harmonics.
OR
9 What are DC filters? Explain how they differ from AC filters and their design principles.

UNIT ? V

10 Describe the typical arrangement of surge arrestor for a converter pole.
OR
11 Explain the types of over voltages occurred in converter stations.

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R13
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