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<br />C") <br />... <br />N <br />N <br /> <br />.- <br /> <br />. <br /> <br />. <br /> <br />o ~ -"""",'''-':''>..'1'_ _~~_"" ~.c,~_'-- <br /> <br />--,.-~~~",,-,,~--,- <br /> <br />'0"-'" ~ <br /> <br />-",~"",.,~~~;~--~---~ <br />.~.,':- -;;. -' :.:'"' <br /> <br />-~t,;.-,. <br /> <br />~r J:-~~~~:~7~Y~~:_-;:< <br />,."" <br /> <br />- ~,-. <br /> <br />14. <br /> <br />pC'rcento.ces V/cro dorivod from th0 estim-tes of tho Buroau <br /> <br />for publicly owned utilities. <br /> <br />Stonm Pl,nnts <br />::ydro GonOr[\o~lOn <br />Hydro Tr~nsmission <br /> <br />Buronu of <br />Po~'er nnd <br />Lip;ht <br /> <br />8.825,% <br />7.925% <br />6.120% <br /> <br />13.5% <br />10.0% <br />10.0% <br /> <br />Privr.te1y <br />Owned <br /> <br />System Stability <br />Thoro is ~ d~finito limit to the power which mny <br />be d"li vered OVl'r f'. gi von tr!:nsmission system, which de- <br /> <br />ponds upon tho volt~go, longt~ of tho line, charn.cteris- <br /> <br />tics of the t,)rminn1 cquipI:1cnt, und tho increment of lond <br /> <br />suppliod of tho naturv of nn~ disturbnnco, which occurs <br /> <br />wh1lo th0 line 1s cr.rrying lor-cd. Such limits nro referred <br />to ,~.s "st~.bility" limits. <br /> <br />Thoro !1,ro tv'o funda.mentn.1 conditions of stn.bi1ity: <br />II sto~.dY-St:'.to" r.nd II trr.nsi0ntll stnbili ty. The limit of <br /> <br />tho former is reO-chcd ;,'hen tho gonornting end and th" ro- <br /> <br />cGiving end of th() tr!~nsmission line pull out of synchro- <br />nism by ilpplving tho lo~d in such smnll increments tht:t no <br />tr['.nsionts of ,..,ny mngnituclo c.ro cr;,;r.tod. The limit of <br />II trr.>.nsiont II stnbillt'y is renchod when the generl'.ting end <br />Ilnd tho receiving end of the trnsmission line cllI'rying <br /> <br />lon.d c.re scpnro:t,-,d ,.1y sudd.en npplicr:ttion of lrlrgo incre- <br /> <br />ments of lo"d or by systvm disturb'1nc,;s such '\8 short <br /> <br />A. B. Roborts <br />