File:Elements of electric traction for motormen and others (1907) (14780743553).jpg

Identifier: elementsofelectr00gant (find matches)
Title: Elements of electric traction for motormen and others
Year: 1907 (1900s)
Authors: Gant, L. W
Subjects: Electric railroads
Publisher: New York, Van Nostrand
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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tion.—The electrical power so generated is first deliveredto the main switchboard for distribution, regulation, etc. On themain switchboard will be found all the main switches, fuses, circuitbreakers, instruments, etc., for the controlling and operating of thevarious dynamo and feeder circuits, thus each dynamo and feedercircuit is controlled and safeguarded. Each dynamo has its ownmain switches, automatic circuit breaker, shunt regulator, etc., withthe necessary instruments such as voltmeter and ammeter for in-dicating the pressure and current. By means of these switches thevarious dynamos can be coupled up in parallel so as to feed thecircuits, or be cut out as the case may require. The current from the machines is thus delivered to what are B 2 ELEMENTS OF ELECTRIC TRACTION called the main bus bars ; these consist of heavy copper bars whichcarry the whole output to the various feeder panels, where it is takenoff for the various districts. Each district, or portion of such, as the
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fH case may require, is fed by means of a feeder cable, each feeder beingcontrolled by its own set of main switches, circuit breaker, fuses,ammeter, etc., fitted on the main switchboard. INTRODUCTION 3 The feeder cables are led underground to the section feederboxes, and from these the overhead trolley wire is fed, as indicatedbelow. The trolley wire is divided up—Board of Trade rule—intosections not exceeding half a mile in length, each half-mile section ofthe trolley wire being insulated from one another by section insulators. The section feeder box on each route generally feeds one sectionof the trolley wire, and the various sections are suitably connectedtogether by means of switches, fuses, connecting links, etc., placed inwhat are termed the feeder boxes. The overhead trolley wire, beingso subdivided and so connected, is not liable to entire breakdownin the event of any accident to one section of the trolley wire, asthat section can be cut out, and the other sections fed by

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