MU Electrical Engineering (Semester 7)
High Voltage Engineering
December 2016
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


Solve any four Q1 (a,b,c,d,e)
1(a) With a neat sketch explain trigaton spark gap used in impulse generators.
5 M
1(b) Explain the phenomenon of treeing in solid insulating materials under electrical Stress.
5 M
1(c) Explain clearly suspended particle mechamism of liquid breakdown.
5 M
1(d) What is Partial discharge? Differentiate between internal and external partial discharges.
5 M
1(e) State and explain Paschen's law.
5 M

2(a) Explain with neat diagrams, why are capcitance voltage dividers preferred for high ac voltage measurements?
10 M
2(b) Explain the streamer theory of breakdown in air at atmospheric pressure.
10 M

3(a) Describe the principle of operation of a resonant transformer? How it is advantageous over the cascade connectd transformers?
10 M
3(b) With a neat sketch, explain the working of a Van-De-Graff generator. What are the factors that limit the maximum output volatge obtained ?
10 M

4(a) Expalin how a sphere gap can be used to measure the peak value of voltages. What are the parameters and factors that influence such voltage measurement?
10 M
4(b) Describe in brief various tests carried out on 'Bushings'. 10
10 M

5(a) Draw and explain a three stage Marx Impulse generator circuit and discuss its applications.
10 M
5(b) Derive an expression for ripple voltage of a Multistage Cock Croft - Walton circuit.
10 M

6(a) Explain Thermal breakdown in solid dielectrics. How this meachanism is more significant than the other mechanisms.
10 M
6(b) What are the various factor to be considered while designjng a High Voltage Laboratory?
10 M



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