. Electric railway journal . ars it isplaced directly to the right of the engineers valve. The designof the valve is such that it cannot be tampered with or operatedexcept by means of the handle supplied with it. All of these pneumatic devices are manufactured by theElectric Service Supplies Company, of Chicago, Philadelphiaand New York. REDUCTION IN GENERATING EQUIPMENT MADE POSSIBLEBY GRAPHIC METER ANALYSIS OF SUB-STATION LOAD An example of the value of the graphic recording meter foranalyzing power loads was recently shown in a sub-stationwhich supplies power to the terminal yards of a larg
. Electric railway journal . ars it isplaced directly to the right of the engineers valve. The designof the valve is such that it cannot be tampered with or operatedexcept by means of the handle supplied with it. All of these pneumatic devices are manufactured by theElectric Service Supplies Company, of Chicago, Philadelphiaand New York. REDUCTION IN GENERATING EQUIPMENT MADE POSSIBLEBY GRAPHIC METER ANALYSIS OF SUB-STATION LOAD An example of the value of the graphic recording meter foranalyzing power loads was recently shown in a sub-stationwhich supplies power to the terminal yards of a large railroadsystem. In this instance it was found possible to reduce thecapacity of the machines operating by more1 than half. Thesub-station referred to contains one 37^-kw and two 25-kwmotor generator sets. These supply direct current at. 250 voltsto three turntables and one small crane. Each of the turn-tables is driven by a 22-hp series motor with rheostat con-troller, and is capable of turning a locomotive 180 deg. in one. Graphic Recording Meter minute. The crane is about 5 tons capacity, and subject to veryintermittent service, so that its operation has little effect onthe total station load. The turntables are held ready for service at all times. Alocomotive to be turned goes to the nearest unoccupied table,and in this way it rarely happens that two turntables arestarted at once, although two or three may be in operation atthe same time. January 29, 1910.] ELECTRIC RAILWAY JOURNAL. 201 Before the study of the actual load conditions had beenbegun, it was customary to operate all three motor-generatorsets during the rush hours. At these times the violent oscilla-tion of the needles of indicating meters on the generatingpanels, striking against the stops, seemed to indicate that moregenerating capacity was needed. To determine this latter ques-tion definitely, a Westinghouse graphic recording meter wasobtained and inserted in the main feeder. The tests covereda weeks careful
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