. Journal of electricity, power, and gas . NDERED POSSIBLE REDUCTION IN GENERATING EQUIPMENT. An example of tbe value of the graphic recording meterfor analyzing power loads was recently shown in a sub-stationwhich supplies power to the terminal yards of a large rail-road system. In this instance, as a result of the applicationof the meter, it was found possible to reduce the capacityof the machines operating by more than half, thereby dimin-ishing operating and improving the efficiency andload factor of the remaining generating equipment. The sub-station referred to contains one ZTA
. Journal of electricity, power, and gas . NDERED POSSIBLE REDUCTION IN GENERATING EQUIPMENT. An example of tbe value of the graphic recording meterfor analyzing power loads was recently shown in a sub-stationwhich supplies power to the terminal yards of a large rail-road system. In this instance, as a result of the applicationof the meter, it was found possible to reduce the capacityof the machines operating by more than half, thereby dimin-ishing operating and improving the efficiency andload factor of the remaining generating equipment. The sub-station referred to contains one ZTA U. w. andtwo 25 k. w. motor generator sets. These supply direct cur-rent at 250 volts to three turntables and one small of the turn tables is driven by a 22 h. p. series motorwith rheostat controller, and is capable of turning a loco-motive 180 degrees, or end for end, in one minute. Thecrane is about five tons capacity and subject to very inter-mittent service, so that its operation has little effect on thetotal station during the starting of a turntable is 120 amperes. Thisdrops to a value of from 50 to 70 amperes during operation,after the table has been accelerated. The maximum peaknoted was about ISO amperes at the time of starting twoturntables simultaneously. As the full load current of the 37% k. w. motor gener-ator set alone is 150 amperes, it becomes very clear that theexisting station capacity is ample to handle the present serv-ice besides a large future increase. Since the tests it has been found necessary to operateonly the one largest unit, and the former practice of runningall three sets as accordingly been discontinued. The resulthas been improved operating economy, efficiency and loadfactor. This example thus cites an instance where, in spiteof a suspected insufficient station capacity, it was demon-strated that less than half the equipment already installedwas needed for the existing demand. The graphic indicatingmeter is equally impartial
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Keywords: ., bookcentury1800, bookdecade1890, bookidjo, booksubjectelectricity
