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

By John G. Webster (Editor)

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Greenwood, Vacuum Switchgear, Exeter, England: Short Run Press, 1994. T. H. Lee, Physics and Engineering of High Power Switching Devices, Cambridge: MIT Press, 1975. ROY E. VOSHALL Gannon University CIRCUIT NOISE CIRCUIT BREAKERS. See CONTACTORS. CIRCUIT, DEFECT TOLERANT. See WAFER-SCALE INTEGRATION. CIRCUIT (FREQUENCY), IDLER. See MICROWAVE PARAMETRIC AMPLIFIERS. CIRCUIT MAGNIFICATION METER. See Q-METERS. htm }{{}} ● HOME ● ABOUT US ● CONTACT US ● HELP Home / Engineering / Electrical and Electronics Engineering Wiley Encyclopedia of Electrical and Electronics Engineering Conductors, Electric Standard Article Pierre Berini1 and Langis Roy2 1University of Ottawa, Ottawa, Ontario, Canada 2University of Ottawa, Ottawa, Ontario, Canada Copyright © 1999 by John Wiley & Sons, Inc.

The bus has feeder lines connecting it to various loads. Only one load is shown here. Note that the feeder circuit has a transformer with a 480 V secondary voltage. The secondary is protected by a 600 V molded-case circuit breaker. Therefore the primary of the main transformer and each feeder line are protected by circuit breakers. Tripping of the breakers between the primary breaker and the feeder breakers must be coordinated so that when a fault occurs downstream on a feeder line, that feeder breaker interrupts the fault rather than the main breaker.

The outdoor vacuum circuit breaker is 368 CIRCUIT BREAKERS Figure 1. Molded-case circuit breaker. Cutaway view shows the arc chamber, electrodes, mechanism, and terminals. The breaker is shown in the open position (courtesy of Cutler-Hammer). shown in Fig. 4. The figure shows the breaker is free standing and with the front removed to show the insulators, linkages, and vacuum interrupters. The mechanism and controls are contained in the low part of the breaker. Overvoltage or overcurrent sensors, such as potential transformers or current transformers, provide information about the circuit, needed to decide when to trip breakers.

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