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2003 Course Power Quality (Elective I)

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Total No. of Questions : 6] P1558 [Total No. of Pages : 3 [3764]-206 B.E. (Electrical) POWER QUALITY (2003 Course) (Elective - I) (403143) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) 6) 7) Answer any three questions from each section. Answers to the two sections should be written in separate books. Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. Your answers will be valued as a whole. Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. Assume suitable data, if necessary. SECTION - I Q1) a) Which are the various stake holders of power quality. Explain various terms of power quality with reference to various stake holders. [6] b) Why power quality issues are becoming important in todays context.[6] c) Explain EMC and emission, immunity terms. [4] OR a) Classify the EMC phenomena as per IEEE std 1159. [10] b) Explain grounding practices recommended by IEEE std 1100 for sensitive electronic equipments. [6] Q2) a) Explain various RMS voltage variations with the help of graphical representation as per IEEE 1159 standard. [10] b) Explain short term (pst) and long term (plt) flicker indices. [8] OR a) Explain flicker, its causes, effects and variation and means to reduce flicker. [12] b) Explain in detail impact of reactive power flow on RMS voltage variations. [6] P.T.O. Q3) a) Explain various voltage sag indices. [6] b) What is Area of vulnerability. Explain detailed procedure for assessment of equipment sensitivity to voltage sag. [10] OR a) Explain in detail the following voltage sag mitigation devices i) DVR ii) SMES iii) CVT. [10] b) Explain various characteristics of voltage sag. [6] SECTION - II Q4) a) Result of Harmonic Measurement at industrial site is tabulated in following table. [8] Harmonic 1 2 3 4 5 6 7 8 9 10 11 12 order Ind. voltage 400 3.00 4.00 2.00 15.00 1.00 7.00 0.70 1.5 0.6 3.0 0.5 Harmonic Mag. (v) Ind. current 50 2.00 3.00 1.00 6.00 0.8 4.00 0.6 1.2 0.3 1.1 0.3 Harmonic Magnitude (Amp) Calculate following Harmonic indices i) % individual current and voltage harmonic distortion from 2nd order to 12th order ii) % iii) % b) Write mathematical relationship for various A.C. quantities under non sinusoidal conditions. [8] OR a) Explain in detail K-rated transformer. [8] b) Explain Harmonic series resonance and consequences of harmonic [8] resonance. Q5) a) Explain various sources and effects of impulsive and oscillatory transients. [8] b) Explain capacitor switching transients and various factors governing magnification of capacitor switching transient. [8] [3764]-206 2 OR a) Explain basic principle of over voltage protection and various devices used for over voltage protection. [10] b) Explain transient velocity, surge impedance and the effect of line terminations. [6] Q6) a) Explain various approaches followed in power quality monitoring with its advantages and disadvantages. [8] b) Explain the factors governing selection of power quality monitor and various equipments used for monitoring power quality parameters. [10] OR a) Explain various voltage and current transducers used for power quality monitoring. [12] b) Explain various power quality monitoring objectives. [3764]-206 3 [6]

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