. The Street railway journal . voltsthree-phase. Bv means of seven 8oo-k\v T-connected energy over the track circuit from Washington, while theenergy from the other phase comes by a more direct electri-cal route over the 33,000-volt transmission circuit. Evenif no cars were in use along the railway between Wash-ington and the sub-station, there would be a considerableunbalance in the load on the two circuits when the syn-chronous motor was heavilyloaded, due to the difference inthe effective impedances in thecircuits of the two phases; theunbalance evidently becomesmuch greater when cars are i
. The Street railway journal . voltsthree-phase. Bv means of seven 8oo-k\v T-connected energy over the track circuit from Washington, while theenergy from the other phase comes by a more direct electri-cal route over the 33,000-volt transmission circuit. Evenif no cars were in use along the railway between Wash-ington and the sub-station, there would be a considerableunbalance in the load on the two circuits when the syn-chronous motor was heavilyloaded, due to the difference inthe effective impedances in thecircuits of the two phases; theunbalance evidently becomesmuch greater when cars are inuse. However, the synchronousmotor possesses the advantage-ous feature of supplying a flexi-ble coupling between the twophases, so that it tends to main-tain the e. m. f. on the overloadphase, to equalize the loads onthe two circuits and to improvethe power factor when the exci-tation is properly adjusted. Themotors were not installed toperform these duties, and maySTANDARU TWO-COMPARTMENT CAR ^^^^^^ ^e used for the transformers, the energy is converted into two-phase; thee. m. f. of one phase is 6600 volts, that of the other 33,000volts. The former phase is connected to the catenary trol-ley system from Washington to Academy Junction, whilethe latter is connected to a single-phase 33,000-volt trans-mission line running to a motor-generator and transformersub-station at Academy Junction. In the sub-station thereare four 8oo-kw transformers which reduce the e. m. 33,000 to 6600 volts. Energy is fed at the latter volt-
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
