06EE73 - High Voltage Engineering Regulation 2006 - 2007 |
PART – A |
UNIT – I INTRODUCTION |
Introduction to HV technology, advantages of
transmitting electrical power at high votages, need for generating high
voltages in laboratory. Important applications of high voltage. |
UNIT – II and III BREAKDOWN PHENOMENA |
Classification of HV insulating media.
Properties of important HV insulating media under each category. Gaseous
dielectrics: Ionizations: primary and secondary ionization processes. Criteria
for gaseous insulation breakdown based on Townsend’s theory. Limitations
of Townsend’s theory. Streamer’s theory breakdown in non uniform fields. Corona discharges. Breakdown in electro negative gasses. Paschen’s law and
its significance. Time lags of Breakdown. Breakdown in solid dielectrics:
Intrinsic Breakdown, avalanche breakdown, thermal breakdown, and electro
mechanic breakdown. Breakdown of liquids dielectric dielectrics: Suspended
particle theory, electronic Breakdown, cavity breakdown (bubble’s theory),
electro convection breakdown. |
UNIT – IV GENERATION OF HV AC AND DC VOLTAGE |
HV AC-HV
transformer; Need for cascade connection and working of transformers units
connected in cascade. Series resonant circuit- principle of operation and
advantages. Tesla coil. HV DC- voltage doubler circuit, cock croft- Walton
type high voltage DC set. Calculation of high voltage regulation, ripple and
optimum number of stages for minimum voltage drop.
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PART – B |
UNIT – V GENERATION OF IMPULSE VOLTAGE AND CURRENT |
Introduction to standard lightning and switching impulse voltages. Analysis
of single stage impulse generator-expression for Output impulse voltage.
Multistage impulse generator working of Marx impulse. Rating of impulse
generator. Components of multistage impulse generator. Triggering of
impulse generator by three electrode gap arrangement. Triggering gap and
oscillograph time sweep circuits. Generation of switching impulse voltage.
Generation of high impulse current. |
UNIT – VI MEASUREMENT OF HIGH VOLTAGES |
Electrostatic voltmeterprinciple,
construction and limitation. Chubb and Fortescue method for HV
AC measurement. Generating voltmeter- Principle, construction. Series
resistance micro ammeter for HV DC measurements. Standard sphere gap
measurements of HV AC, HV DC, and impulse voltages; Factors affecting
the measurements. Potential dividers-resistance dividers capacitance dividers
mixed RC potential dividers. Surge current measurement-Klydanograph and
magnetic links. |
UNIT – VII NON-DESTRUCTIVE INSULATION TESTING TECHNIQUES |
Dielectric loss and loss angle measurements using Schering Bridge,
Transformer ratio Arms Bridge. Need for discharge detection and PD
measurements aspects. Factor affecting the discharge detection. Discharge
detection methods-straight and balanced methods. |
UNIT – VIII HIGH VOLTAGE TESTS ON ELECTRICAL APPARATUS |
Definitions of terminologies, tests on isolators, circuit breakers, cables
insulators and transformers.
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REFERENCE |
TEXT BOOKS: |
1. High Voltage Engineering Fundamentals- E. Kuffel and W.S.Zaengl- 2nd edition, Elsevier, press, 2005
2. High Voltage Engineering- M.S.Naidu and Kamaraju- 3rd Edition,
THM, 2007.
3. High Voltage Engineering -C.L.Wadhwa, New Age International
Private limited, 1995. |
Reference Books |
1. Extra High Voltage AC Transmission Engineering -Rakosh Das Begamudre, Wiley Eastern limited, 1987.
2. Transmission and Distribution Reference Book-Westing House.
3. High Voltage Technology- L. L. Alston- BSB Publication, 2007.
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