Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . Fig. 121. Typical Rheostat withCast-iron Grids 225 130 ELECTRIC RAILWAYS current off from the controller wiring so that the controllers will beabsolutely dead. When two such switches are used, one on each endof the car, they are connected in series. Car Circuif Breaker. Frequently on larg
Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . Fig. 121. Typical Rheostat withCast-iron Grids 225 130 ELECTRIC RAILWAYS current off from the controller wiring so that the controllers will beabsolutely dead. When two such switches are used, one on each endof the car, they are connected in series. Car Circuif Breaker. Frequently on large equipments an auto-matic circuit breaker is provided instead of the overhead circuit breaker can be tripped by hand to open the circuitwhenever desired. It is equipped with a solenoid magnet, which canbe adjusted so that it will trip or open the circuit breaker at approxi-mately whatever current it is set for. This circuit breaker protects. Fig. 122. with Grids and Other Parts Displayed the motor and car wiring from excessive current, such as wouldoccur in case of a short-circuit in motors or car wiring, or in case themotorman turned on current so rapidly as to endanger the windingsof the motors. Circuit breakers, however, are most commonly usedon cars having controllers located at only one end in amotormanscab. A typical automatic circuit breaker is illustrated in Fig. 124,Fuses. A fuse is placed in series with the motor circuit betweenthe trolley and the controller wiring. When circuit breakers are usedinstead of canopy switches, the fuse-box may sometimes be dispensed 226 ELECTRIC RAILWAYS 131 with. The fuse-box on street cars is usually located underneath oneside of the car body where it is accessible for replacing fuses, butwhen a motormans cab is used, the fuse may be placed in the cab.
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Keywords: ., bookauthoramericantechnicalsoci, bookcentury1900, bookdecade1910
