Skip to content
InsemFeb 20232019 patternBE Electrical

Switchgear and Protection SPPU Insem Question Paper Feb 2023

All 4 questions from this SPPU insem 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
Insem
Session
Feb 2023
Max. marks
30
Time
1 Hour
Semester
VIII
Paper code
[6010]-50

Printed for: B.E. (Electrical Engineering) (Insem)

Instructions to the candidates

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

Questions

  1. Q1

    1. a)

      Discuss various causes of faults in a power system.

      Also asked:Mar 2024

      [3]
    2. b)

      Explain following essential properties of protective relaying - i) Selectivity ii) Stability iii) Adequateness

      [6]
    3. c)

      This part has equations that don’t show as text. Open the PDF to read it.

      [6]

  2. Q2

    1. a)

      Draw trip circuit of circuit breaker.

      Also asked:Mar 2025

      [3]
    2. b)

      Derive the torque equation in case of induction type of relays.

      Also asked:Mar 2025

      [6]
    3. c)

      With neat diagram, explain the construction & working of induction type nondirectional overcurrent relay. 2

      Also asked:Mar 2024

      [6]

  3. Q3

    1. a)

      Explain high and low resistance principles of arc interruption in case of circuit breakers.

      Also asked:Mar 2024

      [8]
    2. b)

      Explain following terms with respect to circuit breaker switching - i) RRRV ii) Restriking voltage iii) Recovery voltage iv) Arc voltage

      [7]

  4. Q4

    1. a)

      A three phase alternator has the line voltage of 11 kV. The generator is connected to a circuit breaker. The inductive reactance upto the circuit breaker is 5 ohm per phase. The distributed capacitance up to circuit breaker between phase and neutral is 0.01 micro farad. Determine - i) Peak restriking voltage across the circuit breaker. ii) Frequency of restriking voltage transient. iii) Average rate of restriking voltage up to peak restriking voltage. iv) Maximum RRRV.

      [8]
    2. b)

      With help of voltage & current waveform, explain the current chopping phenomenon associated with CB. In which circuit breaker this phenomenon occurs? What measures are taken to reduce it?  

      [7]