. Electric railway gazette . give the rheostat a turn,and let the machine build up. While the machine isbuilding up consult the ammeter, which gives the totalload on the station, and then make some such calculationas this: I have at present a total load of 800 this new machine is thrown in the combined capacityof all the machines running will be 1,200 amperes. There-fore, eight twelfths of the capacity of the machine is theload it should carry. The capacity of the machine is 250 amperes; T?j of 250is 167 amperes approximately. This, then, is the loadwhich the generator should carr
. Electric railway gazette . give the rheostat a turn,and let the machine build up. While the machine isbuilding up consult the ammeter, which gives the totalload on the station, and then make some such calculationas this: I have at present a total load of 800 this new machine is thrown in the combined capacityof all the machines running will be 1,200 amperes. There-fore, eight twelfths of the capacity of the machine is theload it should carry. The capacity of the machine is 250 amperes; T?j of 250is 167 amperes approximately. This, then, is the loadwhich the generator should carry. Probably before thiscalculation is finished the machine is ready to be thrownin. Bearing in mind the precautions already mentioned, bring the voltage of the machine up to the proper slowly. It takes time for a machine to the desired voltage has been reached, and shows notendency to change, throw in the double-pole should at once be directed to the ammeter. By TROLLEY BUS BAR. means of the rheostat adjust the current to 167 amperes inaccordance with the previous calculation. It will be foundthat the instrument will now readily respond to themotions of the rheostat, while the voltage depends on thevoltage of all the machines and, therefore, has passed outof control. With the three-throw switch the procedure is exactlythe same, only the equalizer is thrown simultaneouslywith the other terminals. With the three separate switches the controller is a littlemore convenient. The equalizer should be thrown firstand then the switch on the positive side. All coils andinstruments are by common custom placed on the outgo-ing wire, hence the series coils are thrown in multiple withthe series coils of the other machines, and are receiving acurrent which provides an initial excitation for the fieldmagnet. This prevents annoying refusals of the machineto build. After the machine has acquired the propervoltage, throw the positive switch, observin
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1895
