Document zQdZe3w4o8j8qZ5gE7dOvrJ36

TECHNICAL BRIEFS IS Digests fur yog on: HYDRO POWER iM*a* . , . . , ,. latest engineering developments for busy power men PRIME MOVERS POWER DISTRIBUTION .ov&l r Inside speciol weothor.proof gouting. Lower portion, 16 ft high, Is permonent; upper section, 12 ft high, ho* ono-ploeo removoble cover for molnienance. Oono olio weother-proofed OOVKRNINO SYSTEMS on modern steom turbines, right, operate olmott without friction losses. Speed-sensing element works through o srnoll pilot volve rotating In oil under pressure. Two oil relays, servo motors, amplify this oction many timet Hydro Power Electrical Features of the Owons River Gorge Prelect. By 0 L Suienfaden, De partment of Pater and Power, Los An geles, Calif. The 112,500-kw Owens River Gorge hydroelectric development has 10.S miles of tunneling, 3.S miles of penstock end 260-miles ol 230-kv transmission line. U consists of three 37,500-kw singleunit plants operating in series to use s total head of 2400 ft in three 800-ft steps. These plants use the water stored In Crowley Lake reservoir. A long pres sure tunnel and short penstock connects this reservoir to the Upper Gorge plant. A second pressure tunnel connects the tail bay of this plant to the surge cham ber and penstock of the Middle Gorge plant. A pressure tunnel, syphon and long penstock form the water channel from the Middle to the Control Gorge plant. The Upper and Middle plants are controlled by supervisory control from the Control plant. ach plant consists nf a 51,200-hp turbine, Its generttor, U-kv switchgear,' step-up transformer bank, synchronous bypass valve and auxiliary equipment. The generator, lt-kv switchgear and all 230-kv equipment ore installed outdoors. A control house is provided for the su pervisory-control equipment, automatic and manual start equipment, relays and station service equipment. Auxiliaries are located in the space below the gen erator deck. Tho Control and Middle plants are now in operation and the Upper plant will go on line this spring. Test and operation of the two completed plants have bean highly satisfactory and indi cate that the use of outdoor construc tion, identical units and supervisory control of this project will fulfill the requirements set up at the start of de sign engineering. AIEE Paper No. 5323. Design Features of Automatic end Su pervisory Control of the Calgary Power, ltd. Hydro Electric System. By T E Cardell, M IV Clarke and H Randle, Cal gary Power, Ltd, Calgary, Aft., Canada. The author's company plans central ized control of its eight hydro-electrio plants and the transformer and switch ing stations on its main 138-kv trans mission system. Siz of these plants and their substations are sow lo open) as unattended plants controlled frotffl central dispatching station. RcpreuSt ing about two^thlrds of lha conpuj^ 156,000 kw hydro generating capacity they range from 4000 to 50,000 kw nj ing. These plants are parts el an latSl connected system with 231,000 kw ' capacity in ten hydro and all plants. A 20,000 and a 30,000-kw pUsj are now being converted to remote alion. A 22,000-kw single-unit plant, oa^3 plated in 1947 was designed at e ~~~ automatic supervisory controlled stall Success of this plant fed to the can* sion of a 20,000 kw station in 1#? which also involved automatic eontrojU of a three-unit pumping installation, r development of three plants fa hydraulically, totalling 74,000 kw us/ng a head of 1300 ft was design^ automatic and remote control and c01*' pitted in 1951. Cost of the auMtnii and supervisory equipment to d*t# a less than the estimated cost of boo> accommodation for manual opes*1" of the plants. Protective features, *yachmo,1j 1M READER SERVICE SECTION