Download PTU B.Tech 2020 March EE 7th and 8th Sem High Voltage Direct Current Transmission Question Paper

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B.Tech.(EE) (2012 Onwards E-lll) (Sem.-7,8)
HIGH VOLTAGE DIRECT CURRENT TRANSMISSION
Subject Code : BTEE-805B
M.Code : 71943

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INSTRUCTION TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students has to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students has to attempt any TWO questions.

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SECTION-A

1. Write briefly :
   1. Write the EMI effect on HVDC link.
   2. Draw the converter characteristics of a HVDC link.
   3. What is the necessity of higher level controller for HVDC link?
   4. What is the use of tap changing transformer in HVDC?

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   5. Mention the basic requirement of control philosophy adopted in HVDC system.
   6. What are the higher level controllers?
   7. What is meant by multi terminal DC link?
   8. How will you overcome the disadvantages in dc transmission?
   9. Draw the diagram of Graetz bridge circuit.

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   10. How will you protect against DC line faults?

SECTION-B

2. Derive the mathematical model of a DC converter.
3. What are the basic principles of over current protection?

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4. Explain the effect of overlap angle on the performance of converter circuit.
5. Obtain the equivalent circuit for rectifier operation of Graetz circuit.
6. Explain the effect of firing angle errors and unbalanced voltages on the generation of harmonics.

SECTION-C

7. Discuss in detail the effect of source inductance on HVDC systems.

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8. What are the different applications of D.C. transmission system? Explain them in detail.
9. Write note on :
   1. Characteristics of a twelve-pulse converter
   2. Configuration and planning for HVDC transmission.

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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