. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . sists of a high and a low voltage relay, a drum typechangeover for connecting the double voltage com-pressors and dynamotors for 600- or 1200-volt operationand a push button at each enginemans position. The air engine of the changeover drum is equipped few seconds later the locomotive will reach the 1200- or1500-volt line, both relays will pick up, as the voltage isabove 750. No further change will take place since bothrelays are lifted and the circuit broken. Assume that the line voltage fai
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . sists of a high and a low voltage relay, a drum typechangeover for connecting the double voltage com-pressors and dynamotors for 600- or 1200-volt operationand a push button at each enginemans position. The air engine of the changeover drum is equipped few seconds later the locomotive will reach the 1200- or1500-volt line, both relays will pick up, as the voltage isabove 750. No further change will take place since bothrelays are lifted and the circuit broken. Assume that the line voltage fails. The changeoverwill remain in the high voltage position if the locomotiveis operating on a high voltage line or throw to that posi-tion if not already there. Hence any failure places theequipment in the safe or high voltage connection. Assume that the line voltage has become abnormallylow (below 200) both relays will then drop but nochange in the position of the changeover drum will occurif operating on a 1200-1500-volt line. If operating on a600-voIt line the changeover drum would throw to the. Electric Locomotive of the Sacramento Northern Railway Built by Westinghouse Elec. & Mfg. Co., and the Baldwin Locomotive Works with a standard and an inverted magnet valve whichalways cause it to throw to the high voltage positionwhen the magnet valves are de-energized, thus assuringthat the locomotive will be in the safe or high voltageconnection or will throw to this position should power beremoved from the locomotive through failure or any othercause. The low voltage relay makes contact when energizedand the high voltage relay makes contact when de-energized. The low voltage relay is set to lift at 300volts and to drop at 200 volts, and the high voltage relayis set to lift at 750 volts and to drop at 200 volts. Thecontacts of these two relays, the two magnet coils of thechangeover drum and a push button on the meter panelin each enginemans compartment are connected in serieswith
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
