. Development and electrical distribution of water power . is distributed at 2,300 volts, three-phase, to large in-dustries located in the immediate vicinity. It will be noted,therefore, that the distribution system possesses many featureswhich have not heretofore been employed to any extent in largecity systems. Substation at the City Limits.—At the city limits, at a mainreceiving substation, energy is received from the 40-mile 50,000-volt three-phase line. The building is thoroughly fireproof, and 254 DEVELOPMENT AND DISTRIBUTION OF WATER POWER every precaution has been taken to prevent inte
. Development and electrical distribution of water power . is distributed at 2,300 volts, three-phase, to large in-dustries located in the immediate vicinity. It will be noted,therefore, that the distribution system possesses many featureswhich have not heretofore been employed to any extent in largecity systems. Substation at the City Limits.—At the city limits, at a mainreceiving substation, energy is received from the 40-mile 50,000-volt three-phase line. The building is thoroughly fireproof, and 254 DEVELOPMENT AND DISTRIBUTION OF WATER POWER every precaution has been taken to prevent interruption of service,because all of the energy from Taylors Falls must pass throughit. This substation contains nine transformer is mounted on a truck and can be run outonto a turn-table and from there over a track along the middle ofthe building to the door. The building is provided with concretefloors. Water for cooling the transformers is obtained from adeep well by means of a pump. There is also a cooling-pond Ground Wire. Fig. 136.—Lightning Arrester Terminal Pole. adjoining the station into which water is discharged after pass-ing through the transformers. Water can either be circulated fromthe well or from the pond. The substation is provided with pipesfor transformer, and switch oil, so that oil can be run into any trans-former case. There is also an oil-treating tank similar to that inthe power station, as described in the article on the power second floor of this substation is the switchboard and switch-room, shown in Fig. 137. The 47,500-volt wires are kept on oneside of the station, and the wires on the other of the high-tension wiring in the upper part of this floor of TAYLOR S FALLS PLANT 255 the building is shown in Fig. 138, where the 47,500-volt wiring isseen on the right. The general scheme of the wiring of this mainsubstation is shown in Fig. 139. The incoming 47,500-volt trans-mission line, afte
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