A report on the alternating current, single phase, interurban railway line between Bloomington and Peoria (1909) (14573672949)

Identifier: reportonalternat00rich (find matches)
Title: A report on the alternating current, single phase, interurban railway line between Bloomington and Peoria
Year: 1909 (1900s)
Authors: Richards, Percy McClure
Subjects: Street-railroads Railroads Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign



Text Appearing Before Image:
d the necessary appliances forchanging from the one current to the other without interferingwith the motion of the car. There is the usual master controllerthe train line, the direct current resistance grids and the con-tractors. The master controller used is of the same shape andappearance as the ordinarjr city car controllerj hut it is smallerand is provided with a dead man release. While this controllertakes its current from the trolley it is so built that no heavycurrents are allowed to pass it and it is protected by fuses* The contractors are placed under the floor of the car, as shown inFigure 23, and are mounted on heavy steel frames and enclosed bysheet steel boxes. The contractors, as in the type M control,are of the magnetic type, the fingers being brought into contactby exciting the coils at the rear of the contractor by the positionof thas master controller. When operating on the direct current, the car operatesthe same as the ordinary direct current car, the current heing
Text Appearing After Image:
206677 D3A-71-3-1 C0.TACT0K. Figure 23 :2- ^ 25 limited by means of the ordinary grid resistances. On thealternating current the Potential Control system is used,that is, acceleration is obtained by increasing the potentialat the motor terminals by connecting the leads to compensatortaps of successively increasing voltages. In this equipment there are two main switches, one an oilswitch for the alternating current and the other a large ccn-t: actor for the direct current. These are operated by magnetceils which are controlled by two knife switches in the motcrmanscab and they are so. arranged that neither will remain closedwhen the car passes to the other current and as they dependupon the trolley current to excite the magnets the one thatis in when the car passes into a dead section of the trolleywill release and the other will i;ot come in until the motormancloses the proper switch. The compensator i s an ordinary oil cooled au to trans-former with the various taps brought out to gi