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High Voltage Engineering (Advanced)

High Voltage Engineering (Advanced). Lecture # 1 Basics of High Voltage. Arsalan A Rahim University of Engineering & Technology Lahore, Pakistan. Course Books. High Voltage and Electrical Insulation Engineering (June 2011 Edition) by Ravindra & Wolfgang (IEEE Press)

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High Voltage Engineering (Advanced)

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

  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 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. Electron Basic Definitions to Start With • Proton • Ion • Ionization • Electric Charge • Space Charge • Volume Charge Densityρv • 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 Breakdownconfined locally to a part of an Insulator(Partial Breakdown) Global Breakdowncomplete rupture or failure of insulator properties(Electrical Breakdown)

  7. Corona: 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 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

  13. Today’s Text Covered from Chapter 1 + Uptil Article 2.3.1 from Chapter 2 of IEEE Press Book (Ravindra Book) and Chapter 1 of KuffelBook

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