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09-HVDC TRANSMISSION

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                                                                                        R09
               Code No: D109114902
                 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
                          M.Tech I Semester Regular Examinations March/April 2010
                                          HVDC TRANSMISSION
                                   (ELECTRICAL POWER ENGINEERING)
               Time: 3hours                                             Max.Marks:60
                                          Answer any five questions
                                       All questions carry equal marks
                                                      ---

                    1. a) Discuss the various applications of HVDC transmission.
                       b) What are the factors to be considered in planning for HVDC transmission?

                    2. How is a suitable voltage level chosen for HVDC transmission?

                    3. Define pulse number, thyristor PIV rating and index of valve utilization and
                       transformer utilization factor.

                    4.
                                                                                    D
                          Derive a formula for average DC voltage of Graetz circuit taking overlap into
                         account.

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                                                                     R
                    5. a) Discuss briefly the principle of DC link control.
                       b) Explain firing schemes adopted in firing angle control along with their relative
                       merits and demerits.
                                                                   O
                                                   W
                    6. Discuss the starting and stopping techniques of DC link in a HVDC transmission
                       system.


                                                 U
                                      T
                    7. How are the signals derived from AC system used to control the DC link to
                       improve the overall performance?




                               J    N
                    8. Discuss the causes of over voltages in HVDC converter station and methods to
                       protect the system against them?


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