Download PDF by John G. Webster (Editor) : 46.Power Delivery

By John G. Webster (Editor)

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Extra resources for 46.Power Delivery

Sample text

Industrial, three-phase, medium-voltage (5 kV to 38 kV) circuit breakers used in factories and office buildings. These are indoor metal-clad breakers. • Local power utility company for supplying power to factories, office buildings and residential homes uses distribution, three-phase, high-voltage (5 kV to 38 kV) circuit breakers. These are outdoor breakers and reclosers. • Transmission, three-phase, high voltage- (Ͼ72 kV) breakers used between the power generating plant and the distribution substations.

For the electrical engineer, conductors are generally employed to deliver power, be it megawatts of hydroelectric power on overhead lines or faint high-speed signals along metallic traces in a microchip. Given the wide variety of applications and the many materials with which to make conductors, choosing the right one can be challenging. The most common materials encountered in the fabrication of electric conductors are metals, and the most popular metals used are silver, copper, gold, and aluminum.

In this arrangement the electrodes separate, the piston is activated simultaneously to produce a blast of SF6 through the electrodes which flows radially outward through the burning arc. The interruption mechanism is the same as previous. Compressed-gas and puffer breakers use a pneumatically operated mechanism similar to the one described previously for oil breakers. DISTRIBUTION BREAKERS High-voltage outdoor distribution breakers and reclosers are used to protect lines and cables from substations to a factory or commercial power distribution centers.

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

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