Download PTU M.Tech. EE 2nd Semester 76081 DIGITAL PROTECTION OF POWER SYSTEM Question Paper

Roll No.

Total No. of Questions : 08

Total No. of Pages : 02

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M.Tech. (Electrical Power System) (2018 Batch) (Sem.-2)

DIGITAL PROTECTION OF POWER SYSTEM

Subject Code : EEPS-201-18

Time: 3 Hrs.

M.Code: 76081

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Max. Marks : 60

INSTRUCTIONS TO CANDIDATES :

1. Attempt any FIVE questions out of EIGHT questions.
2. Each question carries TWELVE marks.

1. a) What are the advantages of using digital techniques in power system protection? (6)

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2. b) What is the use of Non-Recursive digital filter in digital protection system? (6)
3. a) Explain typical model of A/D converter with suitable block diagram. (6)
4. b) Define interpolation and curve fitting. Explain backward, central and forward difference interpolation. (6)
5. a) Describe Walsh function in detail with suitable example. (4)
6. b) Draw and explain the block diagram for:
   1. Numerical overcurrent relay

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   2. Numerical differential protection
   (8)
7. a) Explain Fourier algorithm with sub cycle data window. (6)
8. b) Write the flow chart for simple relay program. (6)
9. a) Explain Mann-Morrison technique for numerical relaying algorithms. (6)

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10. b) List the benefits and limitations of a fuse protection over relay-based protection. Be precise. (6)
11. a) Explain the following :
    1. Signal aliasing
    2. Sample and hold circuit
    3. Sampling theorem
    4. Least square method

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    (12)
12. a) Explain the distance protection algorithm based on travelling waves. (8)
13. b) How sampling is done for digital power system protection? Draw the spectrum of a sampled signal. (4)
14. a) Why scaling of voltage signals for input to digital relay is necessary? Explain how it can be achieved by using potential divider. (6)
15. b) Write some recent advances in digital protection of power system. (6)

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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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