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NR-HVDC TRANSMISSION by SindhuraSindhu1

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                                                                                       NR
            Code No: A4902
               JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
                        M.Tech I Semester Examinations, October/November-2011
                                       HVDC TRANSMISSION
                              (ELECTRICAL POWER ENGINEERING)
               Time: 3hours                                            Max. Marks: 60
                                       Answer any five questions
                                    All questions carry equal marks
                                                   ---

         1. a. Compare EHVAC and HVDC transmission
            b. Explain the advantages and disadvantages of HVDC Transmission.   [12]

         2. a. Explain the analysis of Graetz circuit without overlap.
            b. Explain the Characteristics of twelve pulse converter.           [12]



                                                                                  D
         3. Draw the schematic diagram of a typical HVDC Converter station and explain its major
            components.

                                                                                L
                                                                              [12]

         4. a. Explain the various types of DC and AC filters.
            b. Explain the converter bridge characteristics.

         5. Explain the following.
            a. Individual phase control
                                                                   O R          [12]



            b. Equidistant pulse control
            c. Equidistant Firing angle.


                                               U W
         6. Explain the various types of MTDC Systems.
                                                                                [12]

                                                                                [12]




                               N T
         7. a. Explain the Converter faults.



                         J
            b. Explain the protection against over currents.                    [12]

         8. a. Explain the over voltages in a converter station.
            b. Write short notes on surge arresters.                            [12]

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