Theory and calculation of alternating current phenomena . A EoVr + x^ E = = E, 1 r- -\- X- r--\-x^ or, expanded in a series, F =. F \^ - ^0^ + ^0^ , (xxo + rroY + 4 (xtq - rxp)^ 1 r2 + a;2 ^ 8 (r^ -\-x)^ - °5 i II _, , 26242220181611 / y N\> ?~^, // / \\\ / / \ \ // \w ^AP^s \\ / / N % V \ \ \ \I ^ / \ \ \ \ 12108642 ^ \ \ \\ V \ \ f \ / \ / ^ FIELD CHARACTERISTIC Eo=2500, 2(r1+l0j I/*=I E, x = o \ \i // \ //1 0 20 40 60 80 100 120 140 160 180 200 220 240 260 AMPS. Fig. 132.—Field characteristic of alternator on non-inductive load. As shown, the terminal voltage varies with the conditions o
Theory and calculation of alternating current phenomena . A EoVr + x^ E = = E, 1 r- -\- X- r--\-x^ or, expanded in a series, F =. F \^ - ^0^ + ^0^ , (xxo + rroY + 4 (xtq - rxp)^ 1 r2 + a;2 ^ 8 (r^ -\-x)^ - °5 i II _, , 26242220181611 / y N\> ?~^, // / \\\ / / \ \ // \w ^AP^s \\ / / N % V \ \ \ \I ^ / \ \ \ \ 12108642 ^ \ \ \\ V \ \ f \ / \ / ^ FIELD CHARACTERISTIC Eo=2500, 2(r1+l0j I/*=I E, x = o \ \i // \ //1 0 20 40 60 80 100 120 140 160 180 200 220 240 260 AMPS. Fig. 132.—Field characteristic of alternator on non-inductive load. As shown, the terminal voltage varies with the conditions ofthe external circuit. 188. As an example are shown in Figs. 132-137, at constantgenerated , Eo = 2500; ALTERNATING-CURRENT GENERATOR 265 and the values of the internal impedance, Zo = To + jXo = 1 + 10 J, with the current, I, as abscissas, the terminal voltages, E,as ordinates in full line, and the kilowatts output, = Pr, indotted lines, the kilovolt-amperes output, = IE, in dash-dottedlines, for the following conditions of external circuit:. 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 AMPS. Fig. 133.—Field characteristic of alternator at 60 per cent, power-factor on inductive load. In Fig. 132, non-inductive external circuit, x = 0. T In Fig. 133, inductive external circuit, of the condition, — = + , or a power-factor, In Fig. 134, inductive external circuit, of the condition, r = 0,or a power-factor, 0. In Fig. 135, external circuit with leading current, of the condi-tion, X = — , or a power-factor, In Fig. 136, external circuit with leading current, of the condi-tion, r = 0, or a power-factor, 0. In Fig. 137, all the volt-ampere curves are shown together as 266 ALTERNATING-CURRENT PHENOMENA complete ellipses, giving also the negative or syn-chronous motor part of the a curve is called a field shown, the curve at non-inductive load is nearlyhorizontal at open-circuit, nearly vertical at short-cir
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