File:Electric railway journal (1909) (14574982430).jpg

Identifier: electricrailway341909newy (find matches)
Title: Electric railway journal
Year: 1908 (1900s)
Authors:
Subjects: Electric railroads
Publisher: (New York) McGraw Hill Pub. Co
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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easily possible. The general arrangement of the third-railcurrent collecting shoe and its support is shown in the ac-accompanying engraving. Steel shoes are used and those puton the cars when operation was begun are still in service.The shoes are supported and insulated by wooden beams, car-ried on the truck equalizer bars. Current is carried fromthe shoe through a nearby fuse box to the car circuits.The fuse box, which is made of horn fiber, contains a ribbonfuse and is fitted with blow-out coils to extinguish any arcs. 1 200-VOLT MOTORS The motors operate with 1200 volts across each commuta-tor while the car is running on the 1200-volt third-rail sec-tion. In Stockton, where the motors are fed with only 600-volt current, they operate at half speed, or a maximum of22 m.p.h. A dynamotor supplies 600-volt current for theoperation of the control system while the car is runningon the 1200-volt section. The dynamotor is a small motorwith an armature having two commutators and two sets of
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0 10 .0 30 40 50 60 70 60 1)0 100 Amperes Electric Ite. Journal Central California Traction Company — CharacteristicCurves for 1200-Volt Passenger and Express Car Motors coils wound on the core. The coils which are connectedto the 600-volt commutator are placed in the bottom of theslots, and those connected to the 1 200-volt commutator arewound on top of them. The rated capacity of the dyna-motor is 10 kw. It is hung from the subframe under thecar body and is said to operate satisfactorily and to re-quire very little attention. The electrical control equipmentincludes an electrically operated transfer switch to connectthe power-supply cable with either the trolley base or third-rail shoe. Two contactors, mounted in a box next to thedynamotor under the car body, serve to change the controland dynamotor circuits for either 600-volt or 1200-voltoperation as the car passes a 120-ft. dead section in thetrolley line. One contactor is wound for 600 volts and the other for 1200 volts, and o

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