. Développement et distribution électrique de l'énergie hydraulique . Service avec celui du plantat de l'énergie hydraulique de Great Falls une station de transformation principale à Portland. Les lignes de transport de l'usine de Great Falls doivent être transportées directement à la station de Thenew. Cela permettra l'abandon de plusieurs sous-stations et usines auxiliaires. Le courant à haute tension provenant de BothWest Buxton et de Great Falls sera réduit à une pression uniforme de 2,300 volts pour la transmission à l'usine Consolidated Electric LightCompanys. Là, les groupes moteurs-générateurs sont placés pour convertir la sortie unie en courant continu à

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. Development and electrical distribution of water power . ervice with that of the Great Falls water-power plantat a main transformer station in Portland. The transmissionlines from the Great Falls plant are to be carried direct to thenew station. This will permit the abandonment of several sub-stations and auxiliary plants. The high-tension current from bothWest Buxton and Great Falls will be reduced to a uniform pressureof 2, 300 volts for transmission to the Consolidated Electric LightCompanys plant. There, motor-generator sets are placed forconverting the united output to direct current at 250 volts, which WEST BUXTON PLANT J75 is distributed by a three-wire system throughout the business sec-tion of the city. At present there are installed at the main trans-former station mentioned six 500-K.W., 22, 000/2, 300-volt self-cooled units, with provision for further transformer equipment tohandle the Great Falls output. The transmission line from the West Buxton plant to Portlandconsists of two three-phase circuits of No. 2 wire, a metallic tele-. Fig. 87.—Transmission Line. phone circuit of No. 12 copper wire, and a ground circuit of No.12 phono-electric wire. The main-line insulators are triple petti-coated glazed porcelain, and are mounted on hard maple pins.The circuits are carried one on either side of the pole on two cross-arms, and the triangles are inverted. The wires are placed 36ins. apart. The telephone wires are carried on brackets below thelower arm, while the ground wire is run over the tops of the poles 176 DEVELOPMENT AND DISTRIBUTION OF WATER POWER and grounded at every sixth pole through a No. 4 B. & S. copperwire, connected by a brass screw-plug with a galvanized-iron pipedriven 6 ft. in the ground. The cross-arms are of long-leaf yellowpine, and are doubled at points of curvature on the line. The polesare butt-cut chestnut and vary from 35 ft. to 60 ft. in length, having a minimum diameter at the top of 8 ins. The spacing is100 ft. on tangents. THE

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