. Electrical world. FIG. 3.—ONE OF THE I065-KW. FREQUEXCV-CHANGER UNITS. is transmitted from Shawinigan to Maisonneuve, a distance of 85miles. In the sub-station at Maisonneuve, a suburb of 30-cycle, three-phase current is stepped down from 44,000 voltsto 2,300 volts. The long-distance line between Shawinigan Fallsand Maisonneuve is the longest line east of the Rocky Mountains, generator; the exciter which is shown on the right-hand side of theset serves as starting motor and also excites the two rating of each set is 1,068 kw at 2,300 volts 60 cycles. 100 percent,
. Electrical world. FIG. 3.—ONE OF THE I065-KW. FREQUEXCV-CHANGER UNITS. is transmitted from Shawinigan to Maisonneuve, a distance of 85miles. In the sub-station at Maisonneuve, a suburb of 30-cycle, three-phase current is stepped down from 44,000 voltsto 2,300 volts. The long-distance line between Shawinigan Fallsand Maisonneuve is the longest line east of the Rocky Mountains, generator; the exciter which is shown on the right-hand side of theset serves as starting motor and also excites the two rating of each set is 1,068 kw at 2,300 volts 60 cycles. 100 percent, power factor, or 800 kw at 75 per cent, power factor. Thespeed of the frequency changers is 450 revolutions, the motor being Februarv 13, 1904. ELECTRICAL WORLD and ENGINEER. 309 an 8-poIe machine, the generator a i6-pole machine. Fig. 3 showsone of the sets. The stationarj armatures can be moved parallelto the shaft so as to expose the armature and fields for inspection. FIG. 5.—IIOO-KW., 2,300-VOLT, THREE-PH.\SE, 3O-CYCLE SYXCHRONOUS MOTOR. and repairs. The machines are mounted on I-beams, as shown inFig. 4, which is an- outline drawing of the general arrangement ofthe machines. Some of the constructional features of the motorsand generators are shown in the assembly drawings, Figs. 5 and 6. it was deemed advisable to use large exciters in order to facilitatethe starting of these sets, as at the moment of starting the currenttaken is quite considerable. A 30-cycle induction motor direct-con-nected to a 80-kw direct-current generatoris used for the starting of the frequencychangers. The operation in multiple of frequencychangers is of considerable interest. Imag-ine a frequency changer to be in operationand a second frequency changed is to beconnected in parallel with the first. Imaginethat the first set is carrying full load andthat the second set is to divide the load withit. The motor can be synchronized in theusual manner by adjusting the field
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
