1. High Voltage Engineering (Advanced)
Lecture # 1 Basics of High Voltage
Arsalan A Rahim
University of Engineering & Technology Lahore, Pakistan

2. All books available for Download at ep.nge.com.pk (Course Page)
Course Books
High Voltage and Electrical Insulation Engineering (June 2011 Edition) by Ravindra & Wolfgang (IEEE Press)
High Voltage Engineering Fundamentals (2nd Edition) by E.Kuffel, W.S.Zaengl, J.Kuffel
Reference Books
Advances in High Voltage Engineering (IET) Edited by A.Haddad & D.Warne
High Voltage Engineering by C.L. Wadhwa
High Voltage Engineering by M.S.Naidu (4th Edition)
All books available for Download at ep.nge.com.pk (Course Page)

3. Why High Voltage (Engineering)?
It’s the knowledge of the behavior of dielectrics (insulator) — electrical insulation when subjected to high voltage
No concept of a complete Insulator – Even a good Insulator can conduct under High Voltages
Result is to minimize the volume of the electrical insulation requirements and trouble-free life of high voltage apparatus.
A totally different Domain (Engineering) when High Voltage are applied. Stray Capacitances & Inductances come into play.

4. Basic Definitions to Start With
Electron
Proton
Ion
Ionization
Electric Charge
Space Charge
Volume Charge Density ρv
Electric Discharge
Electric & Magnetic Field
Electromagnetics

5. Di-Electric & Electric Material
What the difference between these ?
Electric Material – capable of developing (conducting) electric charge or current
Di-Electric Material – not capable of developing (conducting) electric charge or current but admits electrostatic and magnetic lines of force
Di-Electric Material Properties– Relative Permittivity εr , Type of Material & Amplitude of Voltage Applied

6. Electrical Breakdown
Failure of Electrical Insulation Properties (flow of current) of an Insulator or Di-electric
Local Breakdown confined locally to a
part of an Insulator (Partial Breakdown)
Global Breakdown complete rupture or failure of insulator properties (Electrical Breakdown)

7. Corona: Streamer: Partial Electrical Breakdown (discharge)
Stable Partial Breakdown (PB) in Gaseous Di-electrics
Types: Audible & Visible Corona
Streamer:
Extension of Corona at Distance
Shower of Discharge (Streamer Corona)
Example: Discharge of Cloud (Lightning)

8. Aurora:
Luminous phenomenon consisting of streamers or Arches of Light at Polar Regions
Explained under “Faraday’s Glow”
Atoms in Ionosphere stuck by High Energy Electrons Coming from Sun (cosmic Radiation)
Aurora Australis (Southern Hemisphere)
Aurora Borealis (Northern Hemisphere)

9. Aurora:

10. Di-electric Property: Capacitance
Is the field between the plates of a Capacitor Uniform?
Permittivity of a Di-electric is Constant ?
Stray Capacitance
How to minimize it?

11. Electric Field
Electric Charge is considered static when there is no movement of charge
Field produced by Static charge or Direct Voltage is known as Electro-static field
Field produced by power frequency Alternating voltage is known as quasi-stationary Electric field
Electric Field Intensity

12. Dielectric Breakdown depends on
Composition of dielectric material, presence of impurities imperfections in the dielectric
Pressure
Humidity
Temperature
Electric field configuration (shape of the electrodes, their size and gap distance)
Electrode material
Duration
Magnitude and the waveform of the applied voltage

14. Today’s Text Covered from Chapter 1 +
Uptil Article from Chapter 2
of IEEE Press Book (Ravindra Book)
and
Chapter 1 of Kuffel Book