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EndsemMay 20232019 patternBE Electrical

Switchgear and Protection SPPU Endsem Question Paper May 2023

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 2023
Max. marks
70
Time
2½ Hours
Semester
VIII
Paper code
[6004]-513

Printed for: B.E. (Electrical Engineering)

Instructions to the candidates

  1. Answer Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6, Q.7 or Q.8.
  2. Figures to the right indicate full marks.
  3. Neat diagrams must be drawn wherevr necessary.
  4. Assume suitable additional data, if necessary.
  5. Use of non-programmable calculator is allowed.

Questions

  1. Q1

    1. a)

      What is auto reclosing of circuit breaker? Discuss multi shot auto reclosing.

      Also asked:May 2024

      [4]
    2. b)

      Mention the advantages and disadvantages of GIS as compared to conventional air insulated substation.

      [6]
    3. c)

      With neat diagram explain the construction & working of Puffer type SF6 circuit breaker.

      Also asked:Nov 2025

      [8]

  2. Q2

    1. a)

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

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

      [4]
    2. b)

      What is difference between field testing and laboratory testing? Explain the relative merits of each.

      [6]
    3. c)

      With neat diagrm explain the construction & working of Vacuum circuit breaker.

      Also asked:May 2024

      [8]

  3. Q3

    1. a)

      Draw block diagram of static relay. Explain its working. State merits and demerits of static relay.

      [10]
    2. b)

      Draw and explain block diagram of PMU. 2

      [7]

  4. Q4

    1. a)

      Draw a block diagam of numerical relay. Explain its woking. State its advantages over conventioinal and static relays.

      [10]
    2. b)

      State Sampling theorem. What is Aliasing? Explain it with neat diagram.

      [7]

  5. Q5

    1. a)

      Restricted earth fault protection of 3 phase alternator gives 100% stator winding protection-Justify the statement stating True/False.

      [4]
    2. b)

      Discuss various abnormal operating conditions & causes of failures in 3 phase induction motor.

      [6]
    3. c)

      Suggest suitable protection scheme to protect power transformer against the magnetic inrush current phenomenon. With neat diagram explain the protection scheme in this case.

      [8]

  6. Q6

    1. a)

      Discuss abnormal condition-Over speeding in case of 3 phase alternator. Suggest protection scheme in this case.

      [4]
    2. b)

      List out different types of faults in alternator. Suggest suitable protection scheme to protect alternator against these faults.

      [6]
    3. c)

      A three phase 33kV/3.3kV, star/delta connected transformer is protected by percentage differential protection. The CTs on LT side have ratio of 400/5. Determine he CT ratio on HT side. Draw the protection scheme.

      Also asked:Nov 2023

      [8]

  7. Q7

    1. a)

      With suitable diagrams explain the effect of i) arc resistance ii) power swing on the operation of distance relay.

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

      [10]
    2. b)

      Draw the schematic of PLCC. State advantages of PLCC.

      [7]

  8. Q8

    1. a)

      Draw block diagram of numerical impedance relay. Explain its working. Draw its algorithm.

      [10]
    2. b)

      With neat diagram explain three stepped distance protection scheme for transmission line. 

      Also asked:Nov 2025 ·Nov 2024 ·May 2024

      [7]