Practical Alternating Currents And Alternating Current Testing
Practical Alternating Currents And Alternating Current Testing
Charles Frederick Smith
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Several methods of determining the approxi- mate value of the armature reactance have been given ; it is therefore usually possible to determine the amount of reactance voltage or idle voltage (= %irnLC). Describe a semi-circle on E rt and from E Y describe an arc with radius equal to 2 TT n L C, the reactance voltage, to cut the semi-circle in P. Then P is the energy com- ponent of the resultant electromotive force in the circuit, and is in phase with the current. The power give^n to the circu...it by either machine = current x voltage of machine x cos 0, where $ is the angle enclosed between the line OP and the voltage of the machine. For the lagging machine, the value of cos will be negative, hence the power given by this machine to the circuit is negative. In other words, this machine absorbs power and is driven by the other. * The difference between the positive and negative power is seen at once by observing whether the projection of the current vector on the voltage vector would have its direc- tion in the same or the opposite direction as the voltage.
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