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Mumbai University Electrical (Semester -III)
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Solution for High Voltage Engineering
December 2015
Index
Q.1)
a) ………………………………………………………………………….2
b) ……………………………………… ………………………………….3
c) ………………………………………………………………………….4-6
d) ………………………………………………………………………….7
e)…………………………………………………………………………. 8-9
Q.2)
a) …………………………………………………………………………. 10-11
b) …………………………………………………………………………. 12-17
Q.3)
a) …………………………………………………………………………. 17-21
b) ………………………………………………………………………….22- 25
Q.4)
a) …………………………………………………………………………. 26-29
b) …………………………………………………………………………. N.A
Q.5)
a) ………………………………………………………………………….30
b) ………………………………………………………………………….31-32
Q.6)
a) ………………………………………………………………………….33-36
b) …………………………………………………………………………. 36-40
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Mumbai University Electrical (Semester -III)
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Q1Attmpt any four
(a) What are electronegative gases? Why is the breakdown strength higher
in these gases compared to that in other gases. (05)
Ans: Break Down in Electro negative Gases :-
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Mumbai University Electrical (Semester -III)
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(b) Explain the phenomenon of tracking in solid insulating materials under
the electrical stress. How it can be minimized.
Ans: Breakdown Due to Treein g and Tracking
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(c) With a neat sketch explain trigatron spark gap used in impulse
generators. (05)
Ans :- Tripping and Control Impulse Generators
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Mumbai University Electrical (Semester -III)
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(d) What are commercial liquid dielectrics, and how are they different from
pure liquid dielectric ? (05)
Ans: Pure Liquids
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Mumbai University Electrical (Semester -III)
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(e) With a neat sketch explain Hall Generators for measurements of high
current. (05)
Ans: Measurement of High Value DC Current by Fall- Generator
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Q2
(a) Explain with neat diagrams the principal of operation of an Electrostatic
voltmeters .Discuss its advantages and limitation on high voltage
measurements. (10)
Ans: Electrostatic Voltmeter
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(b) Why is Cockcroft-Walton circuit preferred for voltage multiplier circuits ?
Explain its working with a schematic diagram. (10)
Ans: Cockroft Walton Voltage Multiplier Circuit
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(5) Similarly C1’ must acquire for stability reasons a charge 3q so that it can
supply a charge q to the load and 2 q to capacitance C2 in next half cycle
(6) During the transformer cycle shown in figure (b) .the diodes D1 ,D2 , D3
conduct when B is positive with respect to A.
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Q3)(a)What is Paschen’s law? How to do account for the optimum voltage for
breakdown under a gi ven ‘p X d condition? (10)
Ans :- Paschens Law
It state that , “Breakdown voltage of uniform filed gap is unique function of
product of p , i.e gas pressure and d i.e. electrode gap distance for a
particular gas and for a given electrode material”
According to Townsends breakdown Criteria γ and α both are function of E/P
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Mumbai University Electrical (Semester -III)
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(b)Describe in brief various tests carried out on overhead line insulators.
Testing Insulator :-
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Q4(a) Explain how a sphere gap can be used to measure the peak value of
voltages.What are the parameters and factors that imfluence such voltage
measurement?
Ans: Sphere Gap Meter
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(b) In an experiment in a certain gas it was found that the steady state current
is 5.5 x 10-8 A at 8KV at distance of 0.4 cm between the plane electrodes
.Keeping the field constant and reducing the distance to 0.1 cm results in a
current of 5.5 x 10-19 A.Calculate Townsend’s primary ionization coefficient
alpha. (10)
Ans: N.A.
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Q5(a) Explain the various theories that explain breakdown in commercial liquid
dielectric . (10)
Ans: Conduction and Breakdown Commercial Liquids
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(b) What is ‘thermal breakdown ’ in solid dielectric ,and how is it practically
more significant than other mechanism. (10)
Ans: Thermal Breakdown
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Q6(a) Describe the construction principle of operation and application of 3-
state Marx generator circuit . (10)
Ans: Multistage Impulse Generators Marx Circuit
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(b)What are the various factors to be considered while designing a high
voltage laboratory . (10)
Ans: Classification of HV Laboratories
1)A small size Labpratory
2)Medium Size Laboratory
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