. American hydroelectric practice; a compilation of useful data and information on the design, construction and operation of hydroelectric systems, from the penstocks to distribution lines . xciter generator continuously. The exciterwater wheel is equipped with hand control only, as the motor serves as aspeed regulator and no governor is necessary. The energy delivered by the generators at 2,300 volts is stepped up to40,000 volts by means of three 1,400 kva., oil-insulated, water-cooledsingle-phase transformers, which are installed in fireproof compartmentsback of the generators. These transfo
. American hydroelectric practice; a compilation of useful data and information on the design, construction and operation of hydroelectric systems, from the penstocks to distribution lines . xciter generator continuously. The exciterwater wheel is equipped with hand control only, as the motor serves as aspeed regulator and no governor is necessary. The energy delivered by the generators at 2,300 volts is stepped up to40,000 volts by means of three 1,400 kva., oil-insulated, water-cooledsingle-phase transformers, which are installed in fireproof compartmentsback of the generators. These transformers are now operating in deltaconnection, delivering current to the transmission hne at 40,000 volts. LOW, MEDIUM AND HIGH HEAD DEVELOPMENTS 129 This voltage will eventually be raised to 60,000 volts by changing the deltaconnection to star connection with grounded neutral. No. 2/0 aluminumseven strand cable is used on wood poles with steel cross arms, spaced 300to 400 ft. XXXIII. Development of Great Northern Power Company at DuLUTH, water supply for the station shown in Fig. 75 is received through atunnel nearly three miles long which diverts the water that normally flows. &«5>.j,4m^^JMl^»>WkW)i■tJii^^^y*■*48^wwwAW^;^^»<vt4^^^^ Fig. 75.—Station of Great Northern Power Company at Duluth, Minn. This station furnishes energy in bulk to metallurgical and industrial plants around Duluth. It containsfour generating units each consisting of an 18,000 hp. inward flow Francis turbine direct connected to avertical shaft revolving field generator rated at 10,000 kw. and operating at 400 r. p. m. The unit is three-phase, 11,000 volt, and at the time of installation in 1906 was the largest constructed. The transmissionvoltage is 110,000 volts. around the bend of a large river. A heavy concrete dam was erected at theintake which will ultimately have a height of 140 ft. The completed instal-lation is designed for an available water head of 535 ft. Tiirbines.—Th
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