Switchgear and Control Handbook

Switchgear and Control Handbook

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A switchgear is a device that opens and closes an electrical circuit (the simplest example being a light switch). These devices are important in the function of electrical systems in power stations as well as commercial and industrial facilities. This edition aims to cover all the major aspects of switchgear design, applications, safety and maintenance. With the expansion in the use of computers, solid state control devices and programmable controls, engineers, electrical contractors and other technical specialists need an understanding of the information provided in this book to meet today's needs in selecting and specifying switchgear and control equipment. Features of this third edition include sections on lighting protection for buildings, electrical equipment and distribution systems, high and low voltage electrical distribution cable, machine and process line control using programmable controllers and computers.with three aquot;preferred sources voltage sensorsaquot; which monitor overvoltage, under- voltage and loss of voltage as shown on the aquot;transfer ... Deviation outside these preset limits will cause the static switch to transfer to the alternate source by turning on the alternate source ... This transfer can be accomplished by a built-in continuity monitor of the preferred source SCR contacts. ... Similar circuitry using rotating machinery is used to a limited extent in the medium and high power range.

Title:Switchgear and Control Handbook
Author: Robert W. Smeaton, William H. Ubert
Publisher:McGraw-Hill Companies - 1998

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