. Electric railways, theoretically and practically treated . GENERAL ELECTRIC AUTOMATIC RELAY TRAINCONTROL. THE STANDARD BRIDGE SYSTEM. This control employs magnetic switches or contactors ofthe standard General Electric form for producing the motorcircuit combinations. The action of these contactors iscontrolled from the master controller, but governed by acurrent relay or throttle in the motor circuit so that theaccelerating current of the motors is substantially is accomplished by having small auxiliary interlockingcontacts on certain of the contactors, so arranged and cornect
. Electric railways, theoretically and practically treated . GENERAL ELECTRIC AUTOMATIC RELAY TRAINCONTROL. THE STANDARD BRIDGE SYSTEM. This control employs magnetic switches or contactors ofthe standard General Electric form for producing the motorcircuit combinations. The action of these contactors iscontrolled from the master controller, but governed by acurrent relay or throttle in the motor circuit so that theaccelerating current of the motors is substantially is accomplished by having small auxiliary interlockingcontacts on certain of the contactors, so arranged and cornected that the contactors will be always energized in adefinite succession, starting with the motors in series withall resistance in circuit, the resistance then cut out step bystep. The motors are then connected in parallel with allresistance in, and the resistance again cut out step by succession is always followed, whether the master con-troller is turned on slowly or thrown directly to the full on position. The progression can be arrested at any. Plate I. — CONWECTIONS OF WESTIKGHOOSE UITIT SWITCH CONTROL. TYPES OF CONTROL AND THEIR OPERATION. 151 point, however, by the master controller, and is neverbeyond the point indicated thereby. The rate of the pro-gression is governed by the relay, so that the advance is notmade faster than will keep the current in the motors withinthe prescribed limit. A relay is provided with each car equipment, so thatwhile the contactors on each car of a train are controlledfrom the master switch at the head of the train as to theapplication and removal of power, the rate of progressionthrough the successive steps is limited by the relays oneach car independently, according to the adjustment andcurrent requirements of that particular car. A particularly noteworthy feature of the control is themethod of accomplishing the series parallel connection ofthe motors. This is by the so-called Bridge method ofconnections, which is so arranged th
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