high voltage engineering (advanced)
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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) - PowerPoint PPT PresentationTRANSCRIPT
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High Voltage Engineering
(Advanced)
Arsalan A RahimUniversity of Engineering & Technology
Lahore, Pakistan
Lecture # 1
Basics of High Voltage
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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)
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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
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Basic Definitions to Start With
• Electron• Proton• Ion• Ionization• Electric Charge • Space Charge• Volume Charge Density ρv
• Electric Discharge• Electric & Magnetic Field• Electromagnetics
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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
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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)
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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)
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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)
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Aurora:
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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?
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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
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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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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 Kuffel Book