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2003 Course Power Quality (Elective I)

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Total No. of Questions : 12] P1305 [Total No. of Pages : 2 [3864]-226 B.E. (Electrical) POWER QUALITY (2003 Course) (403143) (Elective - I) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) Answer 3 questions from Section I and 3 questions from Section II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Your answers will be valued as a whole. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. 7) Figures to the right indicate full marks. SECTION - I Q1) Q2) Q3) Explain various power quality terms as per IEEE std. 1159. [16] OR a) Explain various terms of power quality with reference to each stake holders. Explain EMC, emission and immunity. [10] b) Explain grounding practices as per IEEE std. for better operation of Electronic Equipments. [6] a) Explain various causes, effects of undervoltage and various solutions.[10] b) Explain various causes and effects of flicker. OR [6] Q4) a) Explain various causes, effects of overvoltage and various solutions.[10] b) Explain various means to reduce flicker. [6] Q5) a) Explain voltage sag characteristics. [8] b) Explain with the help of relation influence of fault location and fault level on voltage sag. [10] OR P.T.O. Q6) a) Explain in detail following voltage sag mitigation measures : [10] i) DVR ii) SMES iii) CVT b) Explain stepwise procedure of assessment of sensitivity of equipments to voltage sags. [8] SECTION - II Q7) a) Explain voltage Vs current distortion. b) Explain various AC quantities under non sinusoidal conditions. OR [6] [10] Q8) a) Explain harmonic series and parallel resonance and consequences of harmonic resonance. [10] b) Explain stepwise procedure of IEEE 519-1992 for harmonic analysis.[6] Q9) a) Explain transients, their sources and effects. [8] b) Explain capacitor switching transient and magnification of capacitor switching transient. [8] OR Q10) a) Explain various solutions to mitigate capacitor switching transients and various devices used to provide protection to equipments against impulsive transients. [10] b) Explain transient velocity, surge impedance and the effect of line terminations. [6] Q11) a) Explain why it is necessary to monitor power quality and approaches followed in power quality monitoring. [10] b) Explain various power quality monitoring objectives. [8] OR Q12) a) Explain stepwise procedure to be followed during power quality [10] monitoring. b) Explain selection of transducers for power quality monitoring. rrrr [3864]-226 -2- [8]

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