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<br /> <br />15. <br /> <br />~.)\ <br />. <br /> <br />. <br /> <br />li"'~ <br />~ <br />We <br /> <br />cir uits. 'rho limit of' "transient" stahilit.v is generally <br /> <br />wel below that of "steadv-state" stability. <br /> <br />I When transmission of electric energy is over a <br />sinf:'lc circuH, a fault on the line; is generally removed <br />by troPPing thr., ent ire circui t and interrupting the flow <br />of lower. Singl..( cir<:uit lin8s thorefore are operated on <br />tha basis of their "stoadv-statc" stability. Obviously <br />100;t st(3am standby for such c ircui t.') must be maintained. <br />I Whon a transmission lin3 consists of two or more <br />cirti ts, a faulty lir,o can be r(jmoved without dropping <br />tho'ntiro transmission syst"m. COllsidoratioll can there- <br />! <br />fore) be .:':iven to thu problem of rc:noving certain kinds of <br /> <br /> faul s with tho nuccssarv switChing oCluipn18nt and still <br />. cont TIue to delivor the orieinal load without interruption <br /> to s rvic8. The seotionalizini~ of suoh lines adds very <br /> <br />mat" ially to thG power that can bi') d.clivbrod and such <br /> <br />lin8 ara operated on the basis of thsir "transient" sta- <br /> <br />bili Y limit. Obviously this tYPG of syst8m requiras less <br /> <br />stea standby. <br /> <br />'Vh"r'" 1in.-;s are to be: operated with regard to <br /> <br /> <br />"ste v-state" limit, tho actual loads are hold to 70~ or <br /> <br /> <br />80% 0 that limit in order to provide a safety factor in <br /> <br />opera ion. Whnro ))81'allo.1 lines 11.1'(; opere.ted with regard <br /> <br />. <br /> <br />to "t ansiont~ stability, the actual loads are held to ap- <br />proxitatolY 801 of the calculated "transient" stability <br /> <br />A. B. Roborts <br /> <br />. <br />