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EE2353 High Voltage Engineering Handwritten Lecture Notes - Srikala Edition
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Anna University , Chennai
Department of B.E-Electrical and Electronics Engg
Sixth Semester
EE2353 High Voltage Engineering
Handwritten Scanned Lecture Notes -  Srikala Edition
(Regulation 2008)
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Syllabus :
HIGH VOLTAGE ENGINEERING

UNIT-1 (pg.no 1-20)
OVER VOLTAGES IN ELECTRICAL POWER SYSTEM
UNIT-2 (pg.no 21-52)
ELECTRICAL BREAKDOWN IN GLASS ,SOLIDS AND LIQUIDS
UNIT-3 (pg.no 53-100)
GENERATION OF HIGH VOLTAGE AND HIGH CURRENTS
UNIT-4 (pg.no 101-142)
MEASUREMENTS OF HIGH VOLTAGES AND HIGH CURRENTS
UNIT-5(pg.no 143-151)

Content :
HIGH VOLTAGE TESTING AND INSULATION COORDINATION
UNIT-1
OVER VOLTAGES IN ELECTRICAL POWER SYSTEM
Causes for over voltages and its effects on power system
Large formation in clouds
Simpson’s theory
Reynold and mason theory
Mechanism of lighting
Mathematical model for lighting
Thunderstorm days
Factors influencing lighting
Switching surges and temporary over voltages
Measures to control over voltages due to switching and power frequency
Ground wires
Rod gaps
Bewley lattice diagram

UNIT-2

ELECTRICAL BREAKDOWN IN GLASS ,SOLIDS AND LIQUIDS
Gaseous breakdown
Insulating materials
Types of discharges
Properties of gas insulators
Townsends first ionization coefficient
Breakdown in electronegative gases
Time lag in break down of dielectric
Streamer mechanism
Formation of secondary avalanche
Meek’s expression
Paschen’s law
Breakdown in non uniform fields and corona discharge
Corona discharge
Corona inception field
Negative point plane corona
Break down in non-uniform fields
Vaccum breakdown
Properties of vaccum
Classification
1. High vaccum
2. Very high vaccum
3. Ultra high vaccum
Breakdown process
Cathode heating mechanism
Clump mechanism
Electric breakdown
Cavitation and bubble mechanism
Thermal mechanism of breakdown
Break down in solid dielectric
Breakdown mechanism
Electronic breakdown
Thermal breakdown
Electrochemical breakdown
Tracking

UNIT-3

GENERATION OF HIGH VOLTAGE AND HIGH CURRENTS
Application of high voltages
Generation of HVDC
Half wave rectifier circuits
Full wave rectifier circuits
Voltage doubler circuits
Cascaded voltages doubler circuits
Problems
Electrostatic machines
Vande graff generator
Advantages
Application
Generation of high alternating voltages
Resonant transformer
High frequency resonant transformer is tesla coil
Multistage impulse generator
Generation of switching surges
Impulse generator circuits

UNIT-4

MEASUREMENTS OF HIGH VOLTAGES AND HIGH CURRENTS
High ohmic series resistance with micro ammeters
  Generator voltmeter
Capacitance voltages transformer
Electrostatic voltmeter
Spark gaps for measurements of high DC,AC and impulse voltages
Influence of humidity
Effects of polarity
Peak reading AC voltmeters
Modified peak voltmeter
Uniform field electrode spark gaps
Voltage ratio
Fixed controlled voltages dividers
Mixed RC potential dividers
Measurements of high DC currents resistive shunt
Hall generator
Faradays generator
Squirrel cage shunt

UNIT-5

HIGH VOLTAGE TESTING AND INSULATION COORDINATION
Types of insulators
1. Pin type insulator
2. Suspension type insulators
3. Strain insulators
4. Stack insulators
5. Stray insulators
6. Stackle insulators
Types of testing
1. Type test
2. Routine test
High voltage test
Pollution test
Desert pollution
Testing of transformers

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