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2003 Course Power Quality (Elective I)

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Total No. of Questions : 12] P1158 [Total No. of Pages : 2 [3664]-183 B.E. (Electrical) POWER QUALITY (Elective - I) (2003 Course) (403143) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) 6) 7) Answer 3 questions from Section I and 3 questions from Section II. 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) Explain why power quality issues are gaining importance in today s context. [8] b) Explain various definition of power quality with reference to each stake holder of power quality. Explain the EMC term. [8] OR Q2) a) Define with graphical representation various RMS voltage Variations as per IEEE Std 1159-1995. [10] b) Explain grounding, its purpose and good practices to avoid failure or malfunction of equipments. [6] Q3) a) Explain various causes, effects and solutions of over voltage and under voltage. [10] b) Explain impact of reactive power management on voltage profile. [6] OR Q4) a) Explain voltage flicker, various causes of flicker and techniques for flicker mitigation. [12] b) Explain complex power. [4] P.T.O. Q5) a) Explain various sources of voltage sag. b) Explain various characteristics of voltage sag. OR [12] [6] Q6) a) Explain influence of fault location, fault level on voltage sag. Explain area of vulnerability and critical distance. [9] b) Explain following voltage sag mitigation devices. i) DVR. ii) CVT. iii) DPI. [9] SECTION - II Q7) a) Explain relation of various a.c. quantities under nonsinusoidal conditions. [10] b) Explain various sources of harmonics. OR [8] Q8) a) Explain harmonic series and parallel resonance and various consequences of resonance. [8] b) Explain various harmonic mitigation techniques. Q9) a) Define impulsive and oscillatory transients and their sources. [10] [10] b) Explain how voltage magnification takes place due to capacitor switching. [6] OR Q10) a) Explain various solutions for controlling impulsive transients. [8] b) Explain various techniques to control capacitor switching transient. [8] Q11) a) Explain the various objectives of power quality monitoring. [8] b) Explain requirement of power quality monitor to monitor various power quality parameters. [8] OR Q12) a) Explain various voltage and current transducer used for power quality monitoring. [10] b) Explain Reactive and Proactive approach of power quality monitoring with advantages and disadvantages. [6] [3664]-183 2

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