Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition (1906) (14572173617)

Identifier: reportofelectric02loui (find matches)
Title: Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition
Year: 1906 (1900s)
Authors: Louisiana Purchase Exposition (1904 : Saint Louis, Mo.). Electric Railway Test Commission Norris, Henry Hutchinson, 1873-1940, ed Swenson, Bernard Victor, 1872- ed
Subjects: Electric railroads
Publisher: New York, McGraw
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress



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e Washington Avenue station was connectedI II 1 ~^ / n 1800 \ / \ E ffioip / / /» \ f^ I / SO 1600 K / 7\ c 1400 / \ / / 7 f \ / / / 16 1200 \ / / / \ / / / i / s 4 / -t^ / / > / i rv-Pi rf. / A / / A \^^ A 4 V / / 7 /t /. / 6 400 / / / / / / y / / / / / / 0 0. ^ z i I \ i 100 bO 50 26 40 20 30 16 20 10 10 6 Amperes O 10 20 30 iO 50 60 70 80 90 100 Fig. 43.—Cuiues Showing the General Performance of General Electric Co.No. 54 motor. in parallel with the feeders from the central station supplyingthe Washington Avenue section. Motive Power Equipment. The motive power equipment of this car has already beendescribed in a general way in Chapter I. As the service capac-ity of the motors has an important bearing upon the testsdescribed in the present chapter, their characteristics in opera-tion are here briefly discussed. The performance of these motors with a gear ratio of 14 to 67is shown in Fig. 43. The curves are drawn from data furnished SERVICE TESTS OF A DOUBLE-TRUCK CITY CAR 121
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122 ELECTRIC RAILWAY TEST COMMISSION by the manufacturer, and show the speed, tractive effort, andbrake horse power which the motors develop when taking from10 to 80 amperes, and with a pressure of 500 volts at their ter-minals. The curves also show the total electrical power inputand efficiency of the motors under the same loads. The manufacturers give the rating of these motors at 25 horsepower with 45 amperes input and 500 volts at the motor termi-nals. This output is based upon the standard rating of theAmerican Institute of Electrical Engineers. Its rules statethat the commercial rating of a railway motor shall be the horse-power output developed in a stand test producing 75° C. rise oftemperature above an air temperature of 25° C, after one hourscontinuous run at 500 volts terminal pressure, with the motorcovers removed. General Description of the Tests. Service tests were made on this car on August 18th, August24th, and August 29th, 1904. While the car was operated onthe same