Cochin University of Science and Techology (CUST) 2005 B.Tech Electrical and Electronics Engineering High Voltage Engineering - Question Paper

High Voltage Engineering (November 2005) EEE



1a. discuss and compare the perfomance of half wave rectifier and voltage doubler circuits for generation of high d.c voltages
b. define with a neat sketch, the working of a Van de Graff generator. elaborate the factors that limit the maximum voltage obtained?
2a. discuss with neat diagram, the principle operation of (i) Series resonant circuit (ii) parallel resonant circuit, for generating high ac voltages. Compare their perfomance
b. What is Tesla Coil? How are damped high frequency oscillations found from a Tesla coil?
3a. provide the Morx circuit arrangement for multistage impulse generators
b. How is the basic arrangement replaced to accomodate the wave line control resistance?
4a. Draw a typical impulse current generator circuit and discuss its operation and application
b. A 12 stage impulse generator has 0.126 microF condensers. The wave front and wave tail resistance connected are 800 ohm and 5000 ohm respectively. If the load condenser is 1000pF, obtain the front and tail times of the impulse wave produced
5a. What is meant by Basic Impulse Level? explain the principles involved in the insulation in the insulation co-ordination on EMV systems
b. elaborate Volt time curves. discuss their significance in power system studies
6a. discuss the equipment insulation level and insulation co-ordination of substation
b. provide definitions for the subsequent terms:
i) Normal system voltage
ii) Highest system voltage
iii) Over voltage
7a. define the mechanisms by which lightning strokes induce over voltages on power transmission lines
b. explain the different methods of controlling switching over voltages in power systems
8a. define the construction, principle of operation and application of (i) Rod Gaps (ii) Expulsion Gap
b. discuss the method of selecton of surge diverters and the kind of surge of diverters used in EMV systems
9a. elaborate type, routine and acceptance tests? explain the different tests conducted on insulators
b. discuss how partial discharges in an insulation system or equipment can be detected and displayed
10a.Describe Mole's arrangement for measuring high dissipation factors in low frequency range
b. discuss the high voltage schering bridge for the tans and capacitive measurement of insulators or bushings

Earning:   Approval pending.