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Posted By: srinivas Member Level: Gold Posted Date: 28 May 2008
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2008 Andhra Pradesh State Jawaharlal Nehru Technological University Electrical and Electronics Engineering IV B.Tech II Semester Regular Examinations, Apr/May 2008 HVDC TRANSMISSION Question paper
Code No: RR420202 Set No. 1
IV B.Tech II Semester Regular Examinations, Apr/May 2008
HVDC TRANSMISSION
(Electrical & Electronic Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. Write Technical notes on the following. [8+8]
(a) Back-to-Back HVDC coupling system.
(b) Back to back DC link along with AC feeder.
2. (a) Draw the connection diagram of two, 3f converter transformers to a 12 pulse
converter bridge. [8]
(b) What is meant by (i) firingle angle delay and commutation delay ? Draw the
waveforms for voltage and current in a 6 pulse Gractz circuit with a = 300
and ยต = 150. [8]
3. Draw and explain a block diagram of the Hierarchical levels of controls of HVDC
transmission system. [16]
4. Explain in detail, the concept of reactive power requirement in HVDC converters.
[16]
5. Obtain the mathematical model of a d.c. network and d.c. converter, including
converter controller. [16]
6. (a) Explain the sequence of converter control actions and bipolar to mono polar
transfers during D.C. line fault clearing in a bipolar H.V.D.C. system. [10]
(b) State the various abnormal operating conditions in a thyristor converter value.
[8]
7. It is required to eliminate harmonics of order 10 and below 10 other than funda-
mental in a 12 pulse converter. Suggest a suitable transformer configuration and
derive an equation for primary current of transformer. [16]
8. What are the various types of filters that are employed in HVDC converter station?
Discuss them in detail. [16]
? ? ? ? ?
1
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