Engineering B.E. (Electrical Engineering) Sem 3 December 2022 2022 Electrical Power System IDSE Question Paper - Mumbai University | munotes

Questions asked in this paper

1. Q1 Question No.1 is Compulsory
2. Q2 Answer any three out of remaining five questions
3. Q3 Assume any suitable data wherever required but justified the same
4. Q4 Illustrate answer with sketches wherever required Answer any four from the following questions. (20)
   • a. Describe the significance of transposition of three phase overhead
   • b. Define per unit system. Calculate the per unit impedance, per unit current for 50Q of three phase transmission line considering 220kV as Derive the equation for inductance of three phase line equilateral spacing
   • d. Illustrate the Ferranti effect
   • e. Name the various components of Power cable. Illustrate the significance of Armoring in cable Q A 3phase 132kV, 100km, 50Hz, single circuit line has horizontal spacing (10) of 6m between adjacent conductors. The conductor diameter is 1.2cm Find the capacitance/phase, Charging current/phase and charging MVA of
   • b) A 100 MVA, 33 kV 3-phase generator has a sub transient reactance of 15%. The generator is connected to the motors through a transmission line and transformers as shown in Fig. The motors have rated inputs of 30 MVA and 50 MVA at 30 kV with 20% sub transient reactance. The 3 phase transformers are rated at 110 MVA, 32 kV, A/110 kV Y with leakage reactance 8%. The line has a reactance of 50 ohms. Selecting the generator rating as the base quantities in the generator circuit, calculate the new p.u. value of the impedances and draw the impedance diagram of 10
5. Q3 a) expression for inductance of 3 phase line with unsymmetrical 10 marks
   • b) 15 km long 3 phase overhead line delivers 5 MW at 11KV at a power factor of 0.8 lagging. Line loss is 12% of power delivered. Line inductance is 1.1mH/Km. Calculate ABCD parameters, sending end voltage, sending end current and sending end power 10
6. Q4 a) A double circuit three phase line as shown in the Figure below. The conductors a, a’, b, b’ and c, c’ belong to the same phase respectively. The radius of each conductor is 1.5cm. Find the inductance of the double circuit line in mH/phase/km 10 marks
   • b) the expression for Capacitance of single phase two wire line. 10
7. Q5 the expression for flux linkages due to single current carrying 10 marks
   • b) Illustrate the term step potential and touch potential. 5
   • c) | What do you understand by grading of cables? Explained any one in detail. 5
8. Q6 a) _ Derive the expressions for A, B, C, D constant and draw phasor diagram for medium transmission line in nominal T method 10 marks
   • b) Define Neutral grounding. Discuss the advantages of neutral grounding. Illustrate solid grounding in detail 10

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