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EndsemNov 20232019 patternBE Electrical

EHV AC Transmission SPPU Endsem Question Paper Nov 2023

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

Open the PDFMost repeated EHV AC Transmission questions
Subject code
403151 (A)
Pattern
2019 pattern
Exam
Endsem
Session
Nov 2023
Max. marks
70
Time
2½ Hours
Semester
VIII
Paper code
[6181]-141

Printed for: B.E. (Electrical)

Instructions to the candidates

  1. Answer all questions.
  2. Answer Q.1 or Q.2 and Q.3 or Q.4 and Q.5 or Q.6 and Q.7 or Q.8.
  3. Neat diagram must be drawn wherever necessary.
  4. Figures to the right indicate full marks.
  5. Assume suitable data if necessary.
  6. Use of Calculator is allowed.

Questions

  1. Q1

    1. a)

      Explain surface voltage gradient on single conductor.

      [8]
    2. b)

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

      [8]

  2. Q2

    1. a)

      Derive the condition for maximum charge on EHV conductor of three phase line in terms of elements of matrix [M] where [M] = [P]-1 and [P] is maxwell’s potential coefficient matrix.

      [8]
    2. b)

      Determine Surface voltage Gradient on conductors under Mangoldt (Markt-Mengele) Formulae.

      [8]

  3. Q3

    1. a)

      Evaluate the horizontal, vertical and total value of electrostatic field components near the single circuit transmission line, which are energized by three phase voltages.

      Also asked:May 2023

      [9]
    2. b)

      Derive expression for electrostatic induction on un energized circuit of double circuit line.

      Also asked:May 2023

      [9]

  4. Q4

    1. a)

      Derive the expression for magnetic field calculation of horizontal configuration of Single circuit of three phase lines.

      Also asked:May 2023

      [9]
    2. b)

      Discuss effect of high electrostatic field on: i) Humans ii) Animals iii) Plants 2

      Also asked:May 2023

      [9]

  5. Q5

    1. a)

      Explain the corona formation and methods to reduce the corona effects.

      Also asked:May 2023

      [9]
    2. b)

      Draw a charge-voltage diagram and derive and expression Pc = 1/2 KC (Vm 2 -Vo 2 ) for corona loss.

      [9]

  6. Q6

    1. a)

      With the help of simple block diagram, explain the audible noise measuring circuit in EHV AC lines.

      Also asked:May 2023

      [9]
    2. b)

      State and explain at least 4 formulae for power loss due to corona.

      Also asked:May 2023

      [9]

  7. Q7

    1. a)

      Write note on various properties of XLPE used in EHV cables.

      Also asked:May 2023

      [9]
    2. b)

      Name the materials used for insulation in E.H.V cables; and state the properties of SF6 gas as an insulating in cables.

      Also asked:May 2023

      [9]

  8. Q8

    1. a)

      State and Explain at least four factors to be considered in the design of EHV lines based upon the steady state limits. Also state their limiting value.

      Also asked:May 2023

      [9]
    2. b)

      Define tan δ loss factor and derive an expression for insulation resistance of acable.  

      Also asked:May 2023

      [9]