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EndsemMay 20242019 patternBE Electrical

Switchgear and Protection SPPU Endsem Question Paper May 2024

All 8 questions from this SPPU endsem paper, as printed. Read them here or open the PDF.

Open the PDFMost repeated Switchgear and Protection questions
Subject code
403148
Pattern
2019 pattern
Exam
Endsem
Session
May 2024
Max. marks
70
Time
2½ Hours
Semester
VIII
Paper code
[6263]-114

Printed for: B.E. (Electrical Engineering)

Instructions to the candidates

  1. Solve Q1 or Q2, Q3 or Q4, Q5 or Q6, Q7 or Q8.
  2. Figures to the right indicate full marks.
  3. Neat diagrams must be drawn wherever necessary.
  4. Assume suitable additional data, if necessary.
  5. Use of non - programmable calculator is allowed.

Questions

  1. Q1

    1. a)

      Explain the following terms with respect to circuit breaker. i) Breaking capacity ii) Making capacity

      Also asked:Nov 2025 ·May 2025 ·Nov 2024

      [4]
    2. b)

      What is Auto Reclosing? Discuss single shot and multi shot auto reclosing of circuit breakers.

      Also asked:May 2023

      [6]
    3. c)

      Draw neat diagram and explain the construction and working principle of vacuum circuit breaker?

      Also asked:May 2023

      [8]

  2. Q2

    1. a)

      A 3 phase VCB is rated as 1500 A, 2000 MVA, 33kV, 1 seconds. Determine - i) Symmetrical breaking current ii) Rated making current iii) Short time current iv) Rated normal current

      Also asked:Nov 2025 ·May 2025 ·Nov 2023 ·May 2023

      [4]
    2. b)

      State the advantages & disadvantages of GIS.

      [6]
    3. c)

      Explain physical, chemical & dielectric properties of SF6 gas which makes it to use as arc interrupting medium in SF6 CB?

      [8]

  3. Q3

    1. a)

      With neat block diagram explain working of Numerical relay. Also state its advantages over static & conventional relay.

      Also asked:Nov 2023

      [10]
    2. b)

      Draw and explain the block diagram of PMU. 2

      [7]

  4. Q4

    1. a)

      With neat block diagram explain working of Static relays. Also state its advantages and disadvantages.

      Also asked:Nov 2024 ·Nov 2023

      [10]
    2. b)

      State and explain the sampling theorem. Explain use of anti - aliasing filter in numerical relay.

      Also asked:Nov 2023

      [7]

  5. Q5

    1. a)

      Explain the phenomenon of over fluxing in the transformer. Suggest the protection scheme used in this case.

      [4]
    2. b)

      Explain with neat diagram single phase preventer in case of three phase induction motor.

      [6]
    3. c)

      With neat diagram explain working of Buchholz relay. State its advantages & disadvantages.

      [8]

  6. Q6

    1. a)

      Draw & explain the protection of 3 phase alternators against inter turn faults on same phase.

      Also asked:Nov 2023

      [4]
    2. b)

      Explain the abnormal conditions like i) Unbalance loading and ii) loss of prime mover in case of alternator.

      [6]
    3. c)

      A three phase, 66kV/11kV, Delta-Star connected power transformer is protected by differential protection. The CTs on the LV side have a current ratio of 420/5. What must be the current ratios of CTs on the HV side? Draw a neat connection diagram of the scheme.

      [8]

  7. Q7

    1. a)

      What do you mean by under reach and over reach in case of distance relay? Compare impedance relay, reactance relay and mho relay on the basis of its characteristics on R-X plane, applications, effect of arc resistance.

      [10]
    2. b)

      Explain the three stepped distance protection for transmission line with neat diagram.

      Also asked:Nov 2025 ·Nov 2024 ·May 2023

      [7]

  8. Q8

    1. a)

      Explain the effect of (i) power swings and (ii) arc resistance on the performance of the distance relay. Mention which relay gets highly affected in each case.

      Also asked:Nov 2025 ·May 2025 ·Nov 2024 ·Nov 2023 ·May 2023

      [10]
    2. b)

      Draw block diagram and explain components of power line carrier communication (PLCC) for long transmission lines. 

      [7]