A6402-HVDC TRANSMISSION by SindhuraSindhu1

VIEWS: 1 PAGES: 1

									www.jntuworld.com




               Code No: A4305
                                                                                            NR
                 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
                         M.Tech I Semester Regular Examinations March/April 2010
                                         HVDC TRANSMISSION
                    (COMMON TO POWER ELECTRONICS, ELECTRICAL POWER ENGINEERING,
                       POWER ENGINEERING & ENERGY SYSTEMS, POWER SYSTEMS (HIGH
                                              VOLTAGE))
               Time: 3hours                                                         Max.Marks:60
                                              Answer any five questions
                                           All questions carry equal marks
                                                          ---

               1.      Discuss in detail about HVDC transmission and EHV AC transmission from
                       technical performance, economics and reliability point of view.

               2.      Obtain an equivalent circuit for rectifier and inverter by deriving relevant


               3.
                       expressions.


                                                                                 L D
                       Why harmonics are generated in HVDC systems and derive an expression for


               4.                                                  R
                       fundamental value of current for 12 pulse converters.



                                                                 O
                       What is meant by individual phase control and give its drawbacks also explain the
                       methods to overcome them.

               5.

               6.
                                                   W
                       Explain the objective of DC power modulation in detail.


                                                 U
                       Discuss series multi terminal HVDC system and its control.

               7.

                                   N T
                       What are the over voltages due to disturbances on AC system side explain them.

               8.
                              J
                       Write short notes on the following:
                       a)
                       b)
                              Surge arrestors
                              Commutation failure.

                                                        ******




                                                  www.jntuworld.com

								
To top