. Electrical world. mp; Company at the large Creusotworks (France) are direct-coupled to the turbines which have beenpreviously mentioned. They are of the Thury type with the hexa-gonal form and consequent pole disposition which is characteristicof this system. These machines have a capacity of 420 amperesand operate at 600 volts. The field, which has 6 poles, is compoundwound. The fine wire winding of the field circuit has in series withit a rheostat for the field regulation. An automatic Thury electric regulator is used to operate this rheostat, and keeps the difference ofpotential at the bu
. Electrical world. mp; Company at the large Creusotworks (France) are direct-coupled to the turbines which have beenpreviously mentioned. They are of the Thury type with the hexa-gonal form and consequent pole disposition which is characteristicof this system. These machines have a capacity of 420 amperesand operate at 600 volts. The field, which has 6 poles, is compoundwound. The fine wire winding of the field circuit has in series withit a rheostat for the field regulation. An automatic Thury electric regulator is used to operate this rheostat, and keeps the difference ofpotential at the bus-bars constant. The two generators which are employed for the tramway lines arecoupled in series, with a neutral wire coming from the middle con-nection, so as to produce a difference of potential of 1,200 volts be-tween the end bars of the switchboard, of 600 volts between each ofthe outside bars and the middle. The distribution switchboard of themachines carries the apparatus which are generally employed in trac-. FIG. 4.— MOTOR AND TR.\ILER. tion plants, together with some special devices which are needed forworking the two machines in series on the three-wire system. Themiddle or neutral bar of the switchboard is connected directly withthe tramway rails, which serve as a return conductor. The connec-tion is made by a cable having a section of 125 square millimeterscopper. From the bars of the switchboard start three groups of two feed-ers each, for supplying the traction line. In consequence, the feedingpoints are three in number and the cables are connected in at thepoints where the consumption of current and therefore the drop in theline is the highest. These points occur at Grenoble and Chapareillan,the ends of the traction line, and at Les Drogeaux, near the order to compensate automatically for this drop in the line, each ofthe feeders is made to pass through a booster group which is com-posed of a motor and two generators which give the extra voltag
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
