. Electric railway journal . diagram, Fig. vector OO is the exciting current of the transform-ers, and 01, 02, etc., are the current vector for lines ofthe several lengths. The vector differences between thesevectors, 01, 02, etc., are the charging currents for thedifferent lengths of line referred to the vector for thevoltage of the Lafayette station. The horizontal projec-tions of these vectors, Ol, 02, etc., are the quadrature as ohm per mile. Using this resistance and theactual currents in the high-tension line for differentline lengths, the ordinates for the copper-loss curve
. Electric railway journal . diagram, Fig. vector OO is the exciting current of the transform-ers, and 01, 02, etc., are the current vector for lines ofthe several lengths. The vector differences between thesevectors, 01, 02, etc., are the charging currents for thedifferent lengths of line referred to the vector for thevoltage of the Lafayette station. The horizontal projec-tions of these vectors, Ol, 02, etc., are the quadrature as ohm per mile. Using this resistance and theactual currents in the high-tension line for differentline lengths, the ordinates for the copper-loss curve inFig. 5 were computed. Subtracting this loss for a givenline length from the corresponding intercept in Fig. 2gave as remainder the line leakage loss for the givenlength of line. These losses were plotted to give theleakage-loss curve, Fig. 5, which represents the averageof kw. per mile for the entire line. This loss obvi-ously is independent of any load on the line. The copper losses in the line are not the same with. 400 375 350 325 300 275 250 225 200 175 150 125 100 75 50 25 0 25 50Amperes, Quadrature Current, Low Tension FIG. 3—VECTOR DIAGRAM FOR DETERMINING THE CHARGING CURRENT OF THE LINE components of current for the several lengths. VectorO-ll represents the current input with the Fort Waynetransformers connected, and a line drawn from 0 to 10would be the vector for the current in the transmissionline at Lafayette, expressed in terms of the low-tensioncurrent. The actual charging currents, quadrature components,for different lengths of line are shown by dots in Fig. comparison, the upper line, giving the theoreticalvalues, was drawn. Data for establishing this line werecalculated from the standard formulas for line capacity,using the average spacing of 60 in. The theoreticalvalue for the capacity current is amp. per mile ofline. The lower line in the figure, which was drawn Oil Oil 001 06 OS 01 on OS Or oe or. 01 the line open-ended and with it cl
Size: 2681px × 932px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
