Skin effect - Electrical Engineering Gate

Online Electrical Engineering Study Site

Wednesday, November 12, 2014

Skin effect

Skin effect is a tendency for alternating current (AC) to flow mostly near the outer surface of an electrical conductor, such as metal wire.The effect becomes more and more apparent as the frequency increases

 Such a phenomena does not have much role to play in case of a very short line, but with increase in the effective length of the conductors, skin effect increases considerably

?Why Skin Effect Occurs in Transmission Lines

Conductors, typically in the form of wires, may be used to transmit electrical energy or signals using an alternating current flowing through that conductor. The charge carriers constituting that current, usually electrons, are driven by an electric field due to the source of electrical energy. An alternating current in a conductor produces an alternating magnetic field in and around the conductor. When the intensity of current in a conductor changes, the magnetic field also changes. The change in the magnetic field, in turn, creates an electric field which opposes the change in current intensity. This opposing electric field is called “counter-electromotive force” (back EMF). The back EMF is strongest at the center of the conductor, and forces the conducting electrons to the outside of the conductor

1 comment:

  1. Electrical Engineering
    Oh it is a very good topics.In over head Electrical distribution system skin effect is a very impotent and interesting topics.You express it very easily and hope your next post will be more interesting.