. Electrical world. d operates at 325 revolutions perminute. These turbines are provided with speed regulators whichkeep the speed nearly constant at varying loads. As the turbines use a considerable water supply, it became verydifficult to measure the water which passed through them by a di-rect method. M. Berges adopts an indirect method by which a frac-tional part of the water is measured. The water coming from theturbines passes into the bottom of a large funnel-shaped recipient andmounts to the top. The upper portion of the vessel is cylindrical andis pierced with 80 rectangular openings
. Electrical world. d operates at 325 revolutions perminute. These turbines are provided with speed regulators whichkeep the speed nearly constant at varying loads. As the turbines use a considerable water supply, it became verydifficult to measure the water which passed through them by a di-rect method. M. Berges adopts an indirect method by which a frac-tional part of the water is measured. The water coming from theturbines passes into the bottom of a large funnel-shaped recipient andmounts to the top. The upper portion of the vessel is cylindrical andis pierced with 80 rectangular openings or windows which are dis-posed around the periphery. | These openings have been carefullycalibrated to the same size and the lower edges are all on the sameline. The water which arrives in the reservoir will flow out of theopenings, and the height of the water in the opening gives an indi-cation of the volume of flow. The system thus gives 80 streamsof water, all alike, seeing that the size of the openings is FIG. 3.—OVERHE.^D CONSTRUCTION. One of these streams is then used to measure the volume of thetotal flow. The stream which is chosen for the purpose is sentthrough a water-meter of suitable construction and it only remainsto multiply the reading by 80 in order to obtain the final result. The station is equipped with three railway generators which de-liver continuous current for the line. These generators, which havebeen constructed by Schneider & 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 rheost
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
