New PDF release: Theory and Calculation of Alternating Current Phenomena

By Charles Proteus Steinmetz

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13, but may be even E that is, the potenless than In other words, in a circuit with leading current, the self-induction of the line raises the potential, so that the drop of potential is less than with tial rises in the line. ; AL TERNA TING- CURRENT PHENOMENA. 28 a non-inductive load, or may even be [21 negative, and the voltage at the generator lower than at the other end of the line. These same diagrams, Figs. , r Ix, and a difference of potential, E, at the alternator x of as polar E E , E terminals; and we see, in this case, that with an inductive load the potential difference at the alternator terminals will be lower than with a non-inductive load, and that with a non-inductive load it will be lower than when feeding into Fig.

What volts. F. required at the generator ? In the polar diagram, Fig. F. , E, at the end of the a vector, OE. , Ir, s'ented by OE line induces r in the diagram. F. which / and reactance is The self-inductance of the proportional to the current x, and lags a quarter of a period, or 90,, behind the current. F, AL TERNA TING-CURRENT PHENOMENA. F. F. in phase, X OE . F. 90 ahead of the current. F. , E, Er and Ex hence it is determined as their resultant. F. F. F. we the generator side of the line, to yield the at the receiving end of the line.

F. F. and current ; or conversely, at a given primary Fig. 20. , v will be smaller with an inductive, and larger with a condenser , (leading current) load, than with a non-inductive load. At the same time we see that a difference of phase 'existing in the secondary circuit of a transformer reappears ALTERNATING-CURRENT PHENOMENA. 32 in the primary circuit, somewhat decreased Later we if [22 leading, and see that lagging. slightly increased hysteresis reduces the displacement in the primary circuit, so that, with an excessive lag in the secondary circuit, the if shall lag in the primary circuit may be less than in the secondary.

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Theory and Calculation of Alternating Current Phenomena by Charles Proteus Steinmetz


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