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

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Presentation on theme: "High Voltage Engineering (Advanced) Arsalan A Rahim University of Engineering & Technology Lahore, Pakistan Lecture # 1 Basics of High Voltage."— Presentation transcript:

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

2 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 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. No concept of a complete Insulator – Even a good Insulator can conduct under High Voltages

4 Basic Definitions to Start With Electron Proton Ion Ionization Electric Charge Space Charge Volume Charge Density ρ v 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 ε r, 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: Stable Partial Breakdown (PB) in Gaseous Di-electrics Partial Electrical Breakdown (discharge) Streamer: Extension of Corona at Distance Shower of Discharge (Streamer Corona) Types: Audible & Visible 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” Aurora Australis (Southern Hemisphere) Aurora Borealis (Northern Hemisphere) Atoms in Ionosphere stuck by High Energy Electrons Coming from Sun (cosmic Radiation)

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 Field Intensity 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

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

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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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