. Electric traction and transmission engineering . s based on data obtained from Fig. 31, on which anumber of braking curves may be drawn corresponding toruns of various lengths. Proportionately less of the energy taken from the supplycircuit is used to overcome the losses in other than trainresistance for long runs than in short runs, and thereforethe power consumption per mile is decreased by increasingthe lengths of runs. This is also shown in Fig. 53 for theparticular car under consideration; the curve of power con-sumption per car mile without coasting was computed in 12850 40 1-30 z Ul o
. Electric traction and transmission engineering . s based on data obtained from Fig. 31, on which anumber of braking curves may be drawn corresponding toruns of various lengths. Proportionately less of the energy taken from the supplycircuit is used to overcome the losses in other than trainresistance for long runs than in short runs, and thereforethe power consumption per mile is decreased by increasingthe lengths of runs. This is also shown in Fig. 53 for theparticular car under consideration; the curve of power con-sumption per car mile without coasting was computed in 12850 40 1-30 z Ul TRACTION AND TRANSMISSION. 10 MOTOR x<£f ^^TONS. AVG. BRAKING \AS ^ffi-*MILES PER HR. PER SEC. STATION^V •<*STOP-12 SECONDS. s$V <<<^ LvXr °//t ~//Ql !_. I. Uj// ■ off ul 1 l_ _1 1 RATE OF ACCELERATION IN MILES PER HOUR PER SECOND. Fig- 54- 1-30 ■z. LU o ^20 6 CAR TRAIN. 4 MOTOR CARS, 154 TONS. ACCELERATION , MILES PER HOUR PER SECOND, STATION STOP 10 SECONDS. RATE OF BRAKING IN MILES PER HOUR PER SECOND Fig. 55- connection with Fig. 49. The effect on schedule speed andon energy consumption of changes in the rates of accelera-tion and braking is not as conspicuous on long runs ason short ones. ENERGY CONSUMPTION. 129 The schedule speed of railway cars depends to a greatextent upon the duration of the stops for the purpose oftaking on or discharging passengers or freight. Obviously,the longer the period of standstill the lower will be themaximum schedule speed attainable by a given equipment. An increase in the time of coasting results in a reductionof the power consumption. The results of a series of recent 50 40 1-30 £20 10 6-CAR MOTOR TONS. <WG. BRAKING MILES PER HR. PER SEC STATION STOP-14 SECONDS.
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Keywords: ., boo, bookauthorsheldonsamuel1862, bookcentury1900, bookdecade1910
