File:Proposed Danville - Terre Haute interurban railway (1916) (14596730109).jpg

Identifier: proposeddanville00oswa (find matches)
Title: Proposed Danville - Terre Haute interurban railway
Year: 1916 (1910s)
Authors: Oswald, A. A Shapiro, H. M
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Contributing Library: Paul V. Galvin Library, Illinois Institute of Technology
Digitizing Sponsor: CARLI: Consortium of Academic and Research Libraries in Illinois

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-B,Table VI. and the curve in Fig. 35 were prepared. 61 Motor Equipment. The figures given in the table are based on a generating cost of 1.25 cents per kilowatt-hour at the power house switchboard, which does not include fixed charges and overhead expenses on the power plant equipment* Assuming an average system efficiency of 75 %, this makes the cost of energy at the trolley wheel, exclusive of fixed charges equal to 1.67 cents per kilowatt-hour. TABLE VI. Relation of Maximum Demand per Carto float per Zilowatt»Hour. Ratio 1:1 2:1 3:1Cents per K.W.E. EnergyCost per Z.W.H. at trolley 1.67 1.67 1.67 Fixed Charges on Power House .203 .203 .279 Substation .116 .116 .174 Transmission Line .122 .183 .244 Peede* Copper for .291 .682 .873 Bqual fiegulation With the aid of the curve shown in Pig. 35,we are now prepared to investigate the advantagesthat may be obtained by application of a doublerate of acceleration and of field control to motor6E«225-B. The use of either double acceleration
Text Appearing After Image:
62 Motor Equipment. or field control complicates the control systemon the cars and can only he justified hy showingan increased economy which more than,offsets theadditional first cost and maintenance. In so far as speed characteristic; is con-cerned, using field control is equivalent tochanging the gear ratio. Hence, to use a 20 ^field control in connection with that speedcharacteristic, which has already been shownto he the m4st efficient, it is necessary tochoose a gear ratio 20 ^o larger than the oneso found* Plate X¥I« to XX., inclusive, show theperformance of motor GE-225-B for hoth localand express service when equipped for two ratesof acceleration and for 10 °Jo and 20 $ fieldcontrol. The series acceleratimg rate is in-creased slightly over the values used for singleacceleration; at the end of the series periodthe current is allowed to decrease to one-halfits original value before the motors are thrown P»-H rt CO iH O CO m CM CO KO <J0 a © ^ ^ to ca O r+rH rH

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