By John G. Webster (Editor)

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The widely accepted classical model for a metal conductor is that of a free electron gas where roughly each atom constituting the conductor donates an electron that is free to move under the application of an electric field. This simple model explains reasonably well the behavior of conductors that is observed experimentally on a macroscopic scale. The free-electron gas model of a perfect conductor has interesting consequences. First, it implies that a perfect conductor cannot sustain an internal electric field if charges are at rest.

If the substation supplies urban power, the voltage is 5 kV or 15 kV and feeds power to factories, offices, and hospitals via either overhead lines or cables. Each feeder line is protected by an outdoor distribution circuit breaker. Distribution to urban homes is via overhead lines or cables. This voltage is stepped down by feeder transformers in which the transformer secondary is a three-wire 220 V/110 V circuit. Each line to the neutral voltage is 110 V and 180Њ out of phase. This power is fed to homes via either overhead lines or cables.

J. L. Schanen, E. Clavel, and J. Roudet, Modeling of low inductive busbar connections, IEEE Ind. Appl. , 2 (5): 39–43, 1996. 28. N. G. Hingorani, Introducing custom power, IEEE Spectrum, 32 (6): 41–48, 1995. 29. U. B. Balachandran, Special report—superpower, IEEE Spectrum, 34 (7): 18–19, 1997. RICHARD F. htm }{{}} ● HOME ● ABOUT US ● CONTACT US ● HELP Home / Engineering / Electrical and Electronics Engineering Wiley Encyclopedia of Electrical and Electronics Engineering Circuit Breakers Standard Article Roy E.

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46.Power Delivery by John G. Webster (Editor)

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