. A text-book of electrical engineering;. ller than shown in the figure, r. the equation 1^ = I^.-~is still very nearly 2. Since the ohmic drop in the windings is usually very small, the ter-minal pressure vectors V-y and V2 come almost exactly vertical, that is, theycoincide in direction with the induced 3. The angle of lag <^2 iii the external secondary circuit is consequentlynearly equal to the angle ^^ between the primary terminal pressure andprimary current. Hence, the secondary phase displacement reacts directlyon the primary circuit. 284 Electrical Engineering This
. A text-book of electrical engineering;. ller than shown in the figure, r. the equation 1^ = I^.-~is still very nearly 2. Since the ohmic drop in the windings is usually very small, the ter-minal pressure vectors V-y and V2 come almost exactly vertical, that is, theycoincide in direction with the induced 3. The angle of lag <^2 iii the external secondary circuit is consequentlynearly equal to the angle ^^ between the primary terminal pressure andprimary current. Hence, the secondary phase displacement reacts directlyon the primary circuit. 284 Electrical Engineering This last result enables us to look upon the transformer as a single pieceof apparatus, and to bridge over, in imagination, the separation of the twowindings. Thus, we speak of the pressure drop and copper loss of the trans-former as a whole, as if it had but a single winding. The dotted line joining;the points G and E in Fig. 274 is parallel with, and equal to, the primaryterminal pressure F^. Moreover, as the ohmic pressure drops, OG and OL. Fig. 274 are practically in the same straight line, they can be added together to givea total drop, and we can write GL = OG + OL=^^+I^.R^ . Putting /g equal to -^— , we have gl = i^.r^^i,.r^.^-^ = i^(r^ + r^.^^ 88. Transformer on Inductive Load 285 It would appear from this equation that the primary current passed through the two resistances i?i and R^.tj— in series. The latter is the - asecondary resistance reduced to its equivalent primary value. After over-coming this total resistance the initial terminal pressure V^ is reduced to thesecondary terminal pressure V^. The transformer is somewhat similar to a generator with an F^, an internal resistance R = R.+R.,.%^„, and T a terminal pressure Fj. j^. To make this quite clear, the corresponding diagram for the generator is drawn in Fig. 275, in exactly the same positionas it has in the transformer diagram. The electromotive force is the hypo-tenuse, the side GM is the total o
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