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

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Code: 13A02803

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B.Tech IV Year II Semester (R13) Regular & Supplementary Examinations April 2018

HVDC TRANSMISSION

(Electrical and Electronics Engineering)

Time: 3 hours

Max. Marks: 70

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PART - A

(Compulsory Question)

Answer the following: (10 X 02 = 20 Marks)

1. (a) What is break even distance?
2. (b) What is meant by static conversion?

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3. (c) Define the pulse number of a converter.
4. (d) What is meant by commutation of valve?
5. (e) Differentiate PFC and PPC schemes.
6. (f) List high level controllers for converter station.
7. (g) Define non characteristic harmonics.

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8. (h) List the types of AC filters.
9. (i) What is meant by "Arc through"?
10. (j) What are the disturbances on the DC side of converter station?

PART - B

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

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UNIT - I

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

UNIT - II

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

UNIT - III

1. Explain the basic characteristics of converter control.
   

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   OR
   Describe the hierarchical control Structures used in HVDC link control.

UNIT - IV

1. What are AC filters in DC converter stations? Explain their role in control of DC harmonics.
   OR
   

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   What are DC filters? Explain how they differ from AC filters and their design principles.

UNIT - V

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

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