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<br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />14. <br /> <br />r,::> <br />. .\ <br />",. <br />. <br />oN <br />N <br /> <br />:f <br /> <br />porc ntl.1.ges were derived from the.estim~tes of the Bureau <br /> <br />for tUbliCIY owned utilities. .. <br /> <br />I BureQu of <br />Power and <br />Light <br /> <br />Priv.:ctely <br />Owned <br /> <br />Stenm Plnnts <br />IIydro Genol'atlon <br />Hydro Trrmsmis sion <br /> <br />8.825,% <br />7.925% <br />6.l20% <br /> <br />l3.5% <br />10.0% <br />10.0% <br /> <br />! <br />~te. stability <br />Thoro is (~ d,Jfinite limit to tho power which m.1.y <br /> <br />; ~ . <br /> <br />'( <br /> <br />, d <br />OJ .(. <br /> <br />ivcrod ovor n given trnnsmission system, which de- <br /> <br />paneLs upon tho vol tr~go, longth of the line, charnctol'is- <br /> <br />tics f the t,Jrminal equipment, ahd tho increment of load <br /> <br /> <br />suppl od of tho notur.:J of nny disturbance, which occurs <br /> <br />while tho line is cilrrying lond. Such limits arc refcrred <br />to QS "stnbility" limits. <br />Thoro aro two fundD.montn.l conditions of stability: <br />"stOil -stilton Qnd "transiont" stability. Tho limit of <br /> <br /> <br />mor is roo.ohod '"'hon tho gcnorating ond and the; re- <br /> <br />end of the trr:nsmission line pUllout of synohro- <br /> <br />nism b npplving the lo.....d in such smnll incromonts that no <br /> <br />., <br />. <br /> <br />tri'.nsi nts of ,".n:, mngnitude o.ro orunted. Tho limit of <br /> <br /> <br />"tro.ns ont" stability is roached when. the genernting end <br /> <br />., <br />;;, <br /> <br />~ <br /> <br />and th receiving on0. of tho tr.nsmiSf1ion lino carrying <br /> <br />-! <br /> <br />load C. e sopar'1.tud .JY sudden npplicQtion of lr~rgo incro- <br /> <br />-1 <br /> <br />ments f lo,".d or by syste;m disturb,'1nCGS such '1.8 short <br /> <br />I <br />I <br /> <br />': <br /> <br />A. B. Roberts <br /> <br />,'! <br />, <br /> <br />.'-,. <br /> <br />" <br />i <br />~. <br />