. Electric traction and transmission engineering . d200,000 feet long with converter substations that are tobe cared for by two attendants, each receiving $720 perannum, and each on duty 12 hours each day, every stationto be equipped with two converter units of equal size. Thecost and deficiency constants will be those applying tounits under 500 capacity. Let the following be thevalues of the characteristic constants: P/S = 2500 , 5 = , Iq = ampere per foot, p2 = , h = 5000 hours, pz = , p = 10 ohms, c2 = dollar, w = pound, Cz = Cz = SUBSTATION
. Electric traction and transmission engineering . d200,000 feet long with converter substations that are tobe cared for by two attendants, each receiving $720 perannum, and each on duty 12 hours each day, every stationto be equipped with two converter units of equal size. Thecost and deficiency constants will be those applying tounits under 500 capacity. Let the following be thevalues of the characteristic constants: P/S = 2500 , 5 = , Iq = ampere per foot, p2 = , h = 5000 hours, pz = , p = 10 ohms, c2 = dollar, w = pound, Cz = Cz = SUBSTATIONS. I87 Then \ = [2 X 720 X 200,000 + X 2000 X 2 X 200,000] -7- X X 200,000 X Vio X X X X + z N9 X X sooo~|\£ (2500)2 X J 200,000 X 2 J/ = ([288,000,000 + 80,000,000] -T- [2990 +])2 / 368,000,000 £ o -1 = \/ — = 41,400 feet = miles. V + Thus, the economic separation of converter substations onthis electric railway is miles; consequently. 30 40 50 SPACING IN THOUSANDS OF FEET. Fig. 79- 5 substations will be required, each equipped with two con-version apparatus units of 250 rated capacity. miles is the economic distance between substations isproved by computing the various cost items for the railwaywhich depend upon this distance for different values of X,as in the following table, and as shown in Fig. 79. i88 TRACTION AND TRANSMISSION. Substation spacings in feet. Cost items. 20,000 30,000 41,400 50,000 60,000 Wages, Cw Copper, Cc Equipment, Cs. ... $14,400 3,385 18,558 $9,600 5,075 17,685 $6,960 7,000 17,440 $5,76o 8,460 i7,56o $4,80010,13017,765 Total $36,343 $32,350 $31,400 $3I,78o $32,695 64. Auxiliary Storage Batteries. — If a storage batteryin series with a compound-wound booster1 be connectedbetween the positive outgoing and negative incoming feedersof a substation, the two may be so adjusted as to impressa constant voltage upon these feeders. A
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Keywords: ., boo, bookauthorsheldonsamuel1862, bookcentury1900, bookdecade1910
