File:Electrical world (1904) (14598090620).jpg

Identifier: electricalworld43newy (find matches)
Title: Electrical world
Year: 1883 (1880s)
Authors:
Subjects: Electrical engineering
Publisher: (New York McGraw-Hill Pub. Co., etc.)
Contributing Library: Engineering - University of Toronto
Digitizing Sponsor: University of Toronto

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hree groupsfor the transmission circuits above mentioned, and reduce the voltagefrom 26,500 to 10,800. From Watervliet two 10,800-volt, three-phaseoverhead circuits run to another sub-station of the Hudson RiverWater Power Company about four miles distant near the city limitsof Albany and called the Albany sub-station. The object of thissub-station is to regulate the pressure of the two 10,800-volt circuits,connect their overhead wires with underground cables, and to reducethe voltage of a part of the energy for local distribution. This sub-station is 55 ft. 9 in. by 31 ft. 6 in. on the ground, partly one andpartly two stories in height, and has a basement underneath its entirearea. In structure the walls of this building are brick, the floor ofthe basement concrete, the upper floors concrete on steel I-beams,and the roof tile, also supported by I-beams. The centra! portion of the basement forms an air pressure chamberover which the transformers on the first floor are located. On this
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Fig. I.—View of Interior of Sub-Station of Schenectady Railway, Schenectady, X. Y. circuits is made up of three bare solid copper wires, size 3/0 B. & S.gauge. Energy delivered to the line at Spier Falls at about 30,000volts reaches the Watervliet sub-station 35 miles away at about 26,500volts, and the current from Mechanicville comes into the same sub-station at approximately 10,800 volts. Transformers at the Water-vliet sub-station reduce the 26.500-volt current from Spier Falls tothe 10,800-volt pressure, and the energy from both Spier Falls andMechanicville is then transmitted from Watervliet at this lattervoltage to the local sub-stations of the lighting and traction systemsin Albany and Troy. The energy from Spier Falls is reduced inpressure from 26,500 volts to 10,800 volts at Watervliet because it isnecessary to cross the Hudson River with a cable in order to reachTroy, and to run underground in entering Albany. It was notthought desirable to use as high a pressure as 26

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