Roll No.
Total No. of Pages : 02
Total No. of Questions : 08
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M.Tech.(Power System) (2013 Batch) (Sem.–3)
EHVAC AND HVDC TRANSMISSION SYSTEM
Subject Code : MTPS-301C
M.Code : 72136
Time : 3 Hrs. Max. Marks : 100
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INSTRUCTION TO CANDIDATES :
- Attempt any FIVE questions out of EIGHT questions.
- Each question carries TWENTY marks.
Q1. (i) Compare and contrast AC transmission with DC transmission systems. (10)
(ii) Discuss various modern trends in DC transmission systems (10)
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Q2. (i) A sphere gap consists of two spheres with R=0.25m each. The gap between their surfaces is 0.5m. Calculate the charges and their locations to make the potentials 1 and 0. (15)
(ii) What is the effect of high electrostatic fields on human beings under a line? Why does a normal human being not experience a shock when walking underneath a line? (5)
Q3. (i) Discuss the benefits of FACTS technology. (10)
(ii) List the applications of static synchronous series compensator (SSSC) and explain its working principle. (10)
Q4. Explain the principle of operation of a six pulse Graetz circuit with neat schematic diagram and derive the expression for load voltage and load current. (20)
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Q5. (i) Discuss various factors affecting corona losses. (5)
(ii) Discuss various faults that exist in converter station in HVDC system. Mention the protection techniques. (8)
(iii) Write a note on radio interference due to EHVAC and HVDC systems and what are the methods to reduce this noise? (7)
Q6. (i) Explain in detail various types of filters used in HVDC systems. (10)
(ii) Discuss briefly the design of single tuned filters in HVDC systems. (10)
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Q7. (i) What are the problems and advantages of parallel operation of HVAC and DC systems? (10)
(ii) What are the techniques for controlling the output voltage of converter of HVDC transmission system? (10)
Q8. (i) Why are harmonics generated in HVDC converters? What are the problems associated with the harmonics. (10)
(ii) Distinguish between characteristic and non-characteristic harmonics. (10)
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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FirstRanker.comThis download link is referred from the post: PTU M.Tech 3rd Semester Last 10 Years 2010-2020 Previous Question Papers|| Punjab Technical University
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