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<br />~,:.~,_.....""<'; <br />_- .':C' <br />''1:'''- <br />C <br />N <br />N <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />''!t~; .c.', ~~ ~:7'-';i< ~ -:::~,-.'~ ~ <br /> <br />"~',~. ::'"'_."'!\.__,l ,o.~'iL-... <br /> <br />> ~-(~P/t{;1;~-~~~::~"~7!~C; ,~~~~~~.:~~ <br />g. <br /> <br />. ~;:,,<~7~..-~ <br /> <br />_";~_~~c_,_,,",.,,_~__ <br />.-,,- <br /> <br />amount sufficient to take care of the loss of the largest <br />transmission line and the largest stearn unit. <br />The Qhio Power Company (practically all stearn) <br />finds that a spinning reserve equal to approximately 20% <br />of the installed capacity owned by it is sufficient to <br />provide for continuity of service since their system is <br /> <br />interconnected with a number of other companies such as <br /> <br />the Chio Public Service Company and the Ohio Edison Com- <br /> <br />pany, the Toledo Edison Company, the Indiana and Michigan <br />Electric Company (which is in turn interconnected with <br />companies in the Chicago area); with the Monongahela West <br />Fenn Public Service Company, the Duquesne Light Company, <br />Wheeling Electric Company, Appalachian Electric Company, <br />the Kentucky and West Virginia Power Company, etc. <br />The Union Electric Company of Missouri with a <br />combination of hydro and stea~ generating units supplying <br />~ <br />25 and 00 cycle alternating current provides a spinning <br />capacity equal to the capacity of the largest steam unit, <br />namely, 75,OCO kw. which combined with adequate frequency <br />changer capacity and a large number o! transmission cir- <br />cuits permits the interchange of 25 and 6c cycle current. <br />An analysis of the published statistics <br />(Electrical World of tiny 7, 1939) showing the relation of <br /> <br />generating capaoity to peak demand for a number of Elec- <br />tric Utilities shows the following: <br /> <br />A. B. Roberts <br />