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High Voltage Engineering (Advanced)

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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 (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 (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

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