EE 459 HW SET #3
Chapter 3: (Summary questions for insights)
Q1: What is corona? Why bundling will reduce the development of corona?
A: Corona: ionization of air due to electric field intensity. The higher the
intensity per surface area, the more chances of developing corona. Bundling
uses more than one conductors per phase that increase the surface area of
conductors, and thus reduces the filed intensity.
Q2: Compare the per unit length formulae for transmission line capacitors
with the inductance formulae. What are the differences?
A: One difference is the radius in the capacitor is the real radius r not the r’
in the L. For symmetric cases, LC almost equals to a constant: a
multiplication of dielectric and permeability constants.
Chapter 4: (Summary questions for insights)
Q1: Please give the formulae for lumped pimodel parameters in terms of
per unit length admittance, impedance values and line length. In practice,
what are the formulas for long lines, medium lines and short lines?
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 Spring '08
 Staff
 Equals sign, Transmission line, Impedance matching, Maximum power theorem

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