. 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 . 0o o o3 Co o 2 ^ o ;-! o T3 o Ph bO transmission lines with the large steam stations of the Detroit EdisonCompany. The relatively small total rating of all the generating plantsof the Eastern Michigan Edison Company in comparison with the Delray 92 HYDROELECTRIC PRACTICE and Conners Creek steam plants of the Detroit Edison Company allowsthe hydrauhc stations to contribute power to the system at such times
. 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 . 0o o o3 Co o 2 ^ o ;-! o T3 o Ph bO transmission lines with the large steam stations of the Detroit EdisonCompany. The relatively small total rating of all the generating plantsof the Eastern Michigan Edison Company in comparison with the Delray 92 HYDROELECTRIC PRACTICE and Conners Creek steam plants of the Detroit Edison Company allowsthe hydrauhc stations to contribute power to the system at such times andin such amounts as they are able to produce at their best efficiency. Theresult is that water is wasted over the spillway of the Barton dam only intimes of considerable floods, which last during an average year less thantwo weeks. In other words, excess machine capacity, in conjunction witha large distribution system, has made possible an economical water utiliza-. Fig. 53.—Station of Eastern Michigan Company on Huron River near Ann Arbor, Mich. This station is one of four plants on the Huron River which serve as auxiUary stations to the Delray andConners Creek stations of the Detroit Edison Company. The station contributes power to the system atsuch times and such amounts as can be used most economically. One vertical 68 in. turbine drives a 1000kw. generator and another in. turbine drives a 500 kw. generator, so that the station can be operatedefficiently over load ranges from 250 kw. to 1500 kw. The turbines operate under a normal head of 20 construction cost per installed horse power of main turbines was $ or $135 per kw. of generatingequipment. The plant was designed and its construction was supervised by Gardner S. Wilhams, AnnArbor, Mich. The electrical equipment was furnished by the General Electric Company and the hydraulicequipment by the Allis Chalmers Company.—Electrical World, December 25, 1915. tion that is som
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