. Electric railway journal . rst motor when thespeed is reduced. This could have been done with verysmall loss. Features op Power Regeneration When the frequency of the current produced by thealternators falls from to cycles, the speed oftrains en route diminishes in the same ratio. At thesame time the consumption of power is diminished, onaccount of the lower speed of the trains climbing thegrades and of the regeneration of power by those des-cending grades at the same time. Thus the trains enroute assist the flywheels at Bardonneche in regulatingthe power supply when the latter are
. Electric railway journal . rst motor when thespeed is reduced. This could have been done with verysmall loss. Features op Power Regeneration When the frequency of the current produced by thealternators falls from to cycles, the speed oftrains en route diminishes in the same ratio. At thesame time the consumption of power is diminished, onaccount of the lower speed of the trains climbing thegrades and of the regeneration of power by those des-cending grades at the same time. Thus the trains enroute assist the flywheels at Bardonneche in regulatingthe power supply when the latter are in use. Regeneration is permissible even when no trains areclimbing grades, because automatically functioningrheostats are provided to absorb excess power. When a 345 train descending a grade is regenerating and there isnot at the same time a train ascending a grade, theregenerated power is delivered to the substation. Ifthe motor-generator sets are operating the alternatorsact as synchronous motors, and the excess power is. MONT-CENIS ELECTRIFICATION—CONTACT LINE INSINGLE-TRACK TUNNEL dissipated in the rheostats. Ordinarily the excess allgoes to the rheostats. Each rheostat, of which there are two, consists of ametallic tank connected electrically to the earth and tothe rails, through which water continuously electrodes are immersed in the tank, their positionbeing controlled by an oil-operated regulator identicalwith the type employed in controlling the speed ofhydraulic turbines. The regulator is controlled by asmall induction motor, and a special 5-hp. motor drivesthe oil pump. For the purpose of extinguishing the arc whichoccurs at each immersion and withdrawal of the elec-trodes an oil switch in the electrode leads is openedautomatically by the motion of the regulator arm,closing just before the electrodes enter the water andopening just before they leave. The overhead line consists of a double contact wirefor each of two phases of about 200,000 circ. mi
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
