File:Electrical world (1904) (14597893368).jpg

Identifier: electricalworld43newy (find matches)
Title: Electrical world
Year: 1883 (1880s)
Authors:
Subjects: Electrical engineering
Publisher: (New York McGraw-Hill Pub. Co., etc.)
Contributing Library: Engineering - University of Toronto
Digitizing Sponsor: University of Toronto

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hese reasons it was considered desirable to con-struct an electric railway system which should start from Grenobleand take in a number of the surounding localities. Hydraulic power,which is already used to such a large extent for operating electricplants in the Grenoble region, was called upon here to give the nec-essary current for the plant. The line which has been recently constructed starts from Grenobleand runs to the town of Chapareillan, covering a total distance of26 miles. It gives tourists an opportunity to admire the natural beau-ties of the country and its advent has been warmly welcomed by theinhabitants of the different localities, as it has given a great stim-ulus to the commerce and industry of the region. The Grenoble system presents a novel feature in the use of thedirect-current, three-wire system for supplying the motors of the cars.The trolley line is double and constitutes the two outside wires of thesystem. The middle wire is connected to ground. The motors work
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FIG. I.—MAP OF LINE. two in series upon 1,200 volts between the trolley wires. The middle<:onnection between the motors is grounded. Up to the present the maximum voltage which has been employedfor direct current traction systems in Europe varies from 550 to 650volts. The limit of tension, which is relatively small, kept the sec-tion of copper which is needed for the circuits at a high value. Whilethe three-wire system now effects a considerable saving in copper forlighting and power circuits, it has not been applied to any extent uponelectric traction systems, and therefore a description of the Grenoble-Chapareillan road may prove not without interest. The tension of the overhead line at the terminals is 1,200 volts,the third or neutral wire being connected to the ground by means of a copper cable of 125 square millimeters section which is connectedto the rails of the track, this forming the return circuit. After leaving Grenoble the traction line crosses the Isere River andfoll

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