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2003 Course High Voltage Eng.

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Total No. of Questions : 12] [Total No. of Pages : 3 [3864] - 234 P 1066 B.E. (Electrical) HIGH VOLTAGE ENGINEERING (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any three questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. SECTION - I Q1) a) b) What is ionization? Explain different reasons of ionization in gaseous dielectric material. [8] Define Townsend s first and second ionization coefficients. What is Townsend s breakdown criterion? [8] OR Q2) a) b) Q3) a) b) Describe positive corona and negative corona in non-uniform electric field. [8] What is Paschen s law? What the significance of minimum breakdown voltage value under different P-d conditions? [8] Explain following theories of breakdown in liquid dielectric material i) Suspended particle theory. ii) Cavitation and bubble theory. iii) Stressed oil volume theory. [10] What is composite dielectric? Explain any one method of breakdown in composite dielectrics. [6] OR Q4) Explain following breakdown mechanisms in solid dielectrics. a) Intrinsic breakdown. b) Electromechanical breakdown. c) Thermal breakdown. [16] P.T.O. Q5) a) b) What is insulation co-ordination? Explain statistical method of insulation co-ordination. [9] Discuss various causes of over voltage due to switching surges and also explain means to overcome switching surges in the power system. [9] OR Q6) a) b) Explain with schematic diagram, the development of lightning stroke between cloud and ground. [9] Explain with illustrative example, the co-relation between with stand voltage level of solid insulating material and protective level of protective devices. [9] SECTION - II Q7) a) b) Explain basic waveform and specifications of the impulse voltage with neat sketch diagram of Marx circuit, explain working of multistage impulse generator. [10] Explain any one method of controlling of the tripping of impulse current generator. [6] OR Q8) a) b) Q9) a) b) Explain the working of 3-cascade connected transformers used for generation of a.c. voltages. [8] Explain different circuits used for generation of impulse current in laboratory. [8] Explain the effect of following factors on sparkover voltage of sphere gap unit. i) Nearby earthed object. ii) Atmospheric condition. iii) Irradiation. iv) Polarity and rise time of voltage waveform. [8] Draw a neat sketch and explain the basic principle of operation of series capacitor peak voltmeter used for the measurement of peak value of a.c. voltages. [8] OR Q10)a) b) Draw a neat diagram showing electrostatic voltmeter. Discuss basic principle of operation of electrostatic voltmeter. [8] Discuss the method of balanced detection for locating partial discharges in electrical equipment. [8] [3864] - 234 -2- Q11)a) b) Explain the power factor test and partial discharge measurement test on bushing. [9] Explain different tests on high voltage cables. [9] OR Q12)a) b) Explain the following short circuit tests on circuit breaker. i) Direct test. ii) Synthetic test. [9] Explain various tests conducted on insulator in high voltage testing laboratory. [9] [3864] - 234 -3-

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