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<br />It' <br />... <br />N <br />C"J <br /> <br />- <br /> <br />. <br /> <br />. <br /> <br />.-~-",--' <br /> <br />".....~....,--~"._,-~, <br /> <br />- -'.''-'' -'~:~:'>?:""~:;;i';-": - , <br /> <br />" 0f~?1f~~;:~;'~'" <br /> <br /><~~~~~ <br />~:,: ,:, <br />~~v_ . - <br /> <br />"---::<~l~ <br /> <br />--' ~e~(f~~~'~'~~~~~~~r~:-~":_" <br />-:1&. ., <br /> <br />-~'1"'_'-"".. <br /> <br />p~~ <br /> <br />limit as a safety factor to take care of speed variations <br /> <br />in relays, circuit breakers, load swings, and hunting, <br /> <br />that may be in progress immediately previous to the occur- <br /> <br />rence of a fault or disturbance on one of the circuits. <br /> <br />For the Boulder lines, the Bureau has set the <br /> <br />maximum delivered oneratinr canacitv of two circuits, <br /> <br />operating in parallel with intermediate switchinv stations <br />at 240,000 kw. or 80% of 300,000 kw., the calculated <br />'transient" stability. The calculations include, in addi- <br />tion to the Boulder generators, transformers, and line, <br />the receiving station transformers, 240,000 kva. of svn- <br />chronous condensers and 150,000 kva. of steam plant ?enera- <br /> <br />tors loaded to 60,000 kw. If 150,000 kva. of steam genera- <br /> <br />tors at the receiving end of the line had been assumed as <br /> <br />carryine- hi@:her loads, the "transient" limit of the two <br />circuits would have been raised. Likewise, if the steam- <br />driven generators had been assumed as not carrying load or <br />had not been included in the calculations, the "transient" <br /> <br />stability limit would have been reduced. <br /> <br />When a third circuit is built the increment of <br /> <br />additional capacity 1I'i11 be 150,000 kW., which capacit" <br />results from the fact that it is still possible to tie a <br />thir1 line in parallel with the other two circuits and <br />keon within the limit of rating of the present equipment. <br />This is not a figure directly assignable to the performance <br /> <br />A. B. Roberts <br />