. The Street railway journal . V \ —V \ i ^— 1 1 FIG. 2.—CHARACTERISTICS OF THREE-PHASE CURRENTS mercially voltages up to 3000, and that with further improve-ments the range may be extended to volts. U|) to the])resent stage only glass receptacles have been used, Init theprinci]ile admits of the use of steel shells, in wliich ca^e the 112 STREET RAILWAY JOURNAL. [Vol. XXL No. 3. shell would form the negative electrode, the positive electrodesentering through insulating material, such as glass or porcelain. Figs. 2 and 3 are curves plotted from data taken with a con-verter m regular oper
. The Street railway journal . V \ —V \ i ^— 1 1 FIG. 2.—CHARACTERISTICS OF THREE-PHASE CURRENTS mercially voltages up to 3000, and that with further improve-ments the range may be extended to volts. U|) to the])resent stage only glass receptacles have been used, Init theprinci]ile admits of the use of steel shells, in wliich ca^e the 112 STREET RAILWAY JOURNAL. [Vol. XXL No. 3. shell would form the negative electrode, the positive electrodesentering through insulating material, such as glass or porcelain. Figs. 2 and 3 are curves plotted from data taken with a con-verter m regular operation, the data being applied to rectangu-lar co-ordinates in Fig. 2 and to polar co-ordinates in Fig. curves i, 2 and 3 represent the waves of the e. m. f. gener-ated in the three Y-windings of the generator. Curve 3 is thee. m. f. wave corresponding to the generator terminals of wind-ings 2 and 3, the other corresponding curves of the outer three-phase circuit not being laid down; a, a, a are the three e. ni. was 110, the delta voltage at the terminals of the machine andthe upper electrodes 193, and that of the pulsating direct currentno. In this, as in all other tests, the drop between the upperand lower electrodes was approximately It will be noted that the curve in the working circuit corre-sponds to a direct pulsating current. If more than three phase.^were delivered to the converter the working e. m. f. would, ofcourse, have less difference between its maximum and mini-mum value—that is, the current would more nearly ipproacha continuous current. In this respect the action of the con-verter may be compared with that of acommutator, a three-phase convertercorresponding to a three-part accumu-lator, a six-phase converter to a six-partcommutator, etc. It has been found thata pulsating current is most efficient incharging storage batteries, and for thispurpose the converter in its presentsimple form is directly applicable. FORD FRANCHISE TAX LAW 1
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
