File:Pacific service magazine (1918) (14760417946).jpg

Identifier: pacificservicema1019paci (find matches)
Title: Pacific service magazine
Year: 1912 (1910s)
Authors: Pacific Gas and Electric Company
Subjects: Pacific Gas and Electric Company Electric utilities Electrical engineering Public utilities
Publisher: San Francisco : Pacific Gas and Electric Company
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library

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ge. Up to this time the SiskiyouDistrict had been dependent upon thetransmission system over the divide fromMedford for power during the peak load.The installation of the first turbine atCopco brings the generator capacity abovethe peak load demand, so that the trans-mission line over the range is now usedfor standby service. This network oflines is unique in that it is supplied en-tirely by hydro-electric installations, nosteam plants being in any way connectedwith it. Each branch of the system hasa small plant of its own near the centerof distribution, which is augmented bypower from the large central plants. Situated just two miles from the FallCreek plant, built in 1903 and the first ofthe many now operating in parallel,Copco presents many contrasts with itspredecessor, as shown by the followingtable: CapacityPlant Power Source H. P. UltimateHead in Ft. Copco, AUis-Chalmers Turbine. .18,600Fall Creek, Pelton Water Wheel. 1,000 . 500. 1,250 125730730730 Pacific Service Magazine 255
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ydro-Electric Power Plant atlounty, California The turbine is of the low head type,rated at 18,600 h. p. The double wheel issupplied by two 10-foot penstocks, anddischarges through a center outlet be-tween the wheels. The comparativelyslow speed of 200 r. p, m. necessitated animmense machine for the 12,000-kva. gen-erator, the rotor alone weighing 85,000pounds. A fair idea of the size of thisapparatus can be obtained when it isknown that to transport these heavypieces down the nearly perpendicularwalls of the canyon necessitated thebuilding of a zigzag railroad with a max-imum grade of ten per cent. Two 200-k. w. exciters are operated by small indi-vidual turbines. Generation of power isat 2300 volts, two banks of transformersstepping up to 34,000 Delta and 60,000 Yfor transmission. Eventually it is plannedto make all the lines 60 kv. The power house is located at the footof the dam, the penstocks leading directlyfrom the top of the dam to the turbine. Copco, on Klamath The height of

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