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2003 Course High Voltage Eng. (Elective II)

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Total No. of Questions : 12] P1160 [Total No. of Pages : 2 [3664]-191 B.E. (Electrical) HIGH VOLTAGE ENGINEERING (Elective - II) (2003 Course) (403150) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 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. SECTION - I Q1) a) Discuss effects of corona discharges. b) Explain time lag for breakdown in gases. [8] [8] OR Q2) a) Discuss Townsend s law for breakdown in gases. b) Explain streamer mechanism for breakdown in gases. [8] [8] Q3) a) Discuss various factors that influence conduction in pure liquid dielectrics and in commercial liquid dielectrics. [10] b) Discuss process of breakdown in composite insulation system. [8] OR Q4) With reference to breakdown in solid dielectrics discuss a) Intrinsic breakdown. b) Electromechanical breakdown. c) Thermal breakdown. [6] [6] [6] Q5) Write short notes on : a) Lightning phenomenon and development of overvoltages in power system. [6] b) Overvoltages due to switching surges. [5] c) Overvoltages due to system faults and abnormal conditions. [5] OR Q6) a) Discuss principles of insulation coordinations on high voltage and extra high voltage power system and substation. [12] P.T.O. b) How are the protective devices chosen for optimal insulation level in a power system. [4] SECTION - II Q7) a) What is the principle of operation of a resonant transformers? How is it advantageous over the cascade connected transformers. [9] b) Draw a neat sketch of Marx circuit arrangement used for multistage impulse generator. Discuss basic principle of operation of Marx circuit. [9] OR Q8) a) Discuss basic principle of impulse current generator used for generation of impulse currents in laboratory. [9] b) Explain with neat sketches the principle of operation used for tripping and control of impulse generators. [9] Q9) a) Draw neat sketch of capacitance voltage divider. Explain basic principle of operation of capacitance divider used for the measurement of high ac voltages. [8] b) Discuss use of sphere gap unit for measurement of high DC, AC and impulse voltages. Explain various parameters that influence voltage measurement. [8] OR Q10) a) Draw the schematic arrangement of an impulse potential divider with an oscilloscope connected for measuring impulse voltages. Explain the arrangement used to minimize errors. [8] b) Explain with neat schematic diagram the basic principle used for high voltage schering bridge for the dissipation factor and capacitance [8] measurement of insulators. Q11) a) Discuss method of high voltage testing of insulators. [8] b) Explain with a schematic diagram one method of radio interference measurements of transmission line hardware. [8] OR Q12) Write short notes on : a) Testing of cables. b) Testing of power transformers. c) Operating duty cycle test on a surge arrester. [3664]-191 2 [5] [5] [6]

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