Theory and calculation of alternating current phenomena . Fig. 117. Such circuits have been discussed in detail in Chapter IX,and the results derived there are now directly applicable to thetransformer, giving the variation and the control of secondaryterminal voltage, resonance phenomena, etc. Thus, for instance, if Z\ = Zo, and the transformer containsan additional secondary coil, constantly closed by a condensivereactance of such size that this auxiliary circuit, together withthe exciting circuit, gives the reactance, — rro, with a non-inductivesecondary circuit, Zi = Vi, we get the conditi
Theory and calculation of alternating current phenomena . Fig. 117. Such circuits have been discussed in detail in Chapter IX,and the results derived there are now directly applicable to thetransformer, giving the variation and the control of secondaryterminal voltage, resonance phenomena, etc. Thus, for instance, if Z\ = Zo, and the transformer containsan additional secondary coil, constantly closed by a condensivereactance of such size that this auxiliary circuit, together withthe exciting circuit, gives the reactance, — rro, with a non-inductivesecondary circuit, Zi = Vi, we get the condition of transformationfrom constant primary potential to constant secondary current,and inversely. ALTERNATING-CURRENT TRANSFORMER 205 153. As seen, the alternating-curront transformer is charac-terized by the constants: Ratio of turns: a = — Hi Exciting admittance: }o = (7o — jbo. Self-inductive impedances: Zo = ro + jaro. Zi = ri -\- jxi. Since the effect of the secondary impedance is essentially thesame as that of the primary impedance (the only
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