Theory and Calculation of Alternating Current Phenomena

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9781230859811: Theory and Calculation of Alternating Current Phenomena
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ...or in a stationary transformer. That is, magnetically, the power components of stator and rotor current neutralize each other. Not so, however, the reactive components, since the reactive component of the rotor current, h = V + j"t in its reaction on the stator is reversed, by the reversed direction of relative rotation, or the slip, s =--1, and the effect of the rotor current, I2, on the stator circuit accordingly corresponds to hence, the total magnetic effect is = ,'-/) +/&"+,"); and since the total effect must be the exciting current 0 0 1 J' J it follows that t/-/ = i/andt/' +t/' Hence, the stator power current and rotor power current, i' and i2', are equal to each other (when neglecting the small hysteresis power current). The synchronous exciter of the machine must supply in addition to the magnetizing current, the total reactive current of the load. Or in other words, such a machine requires a synchronous exciter of a volt-ampere capacity equal to the volt-ampere excitation plus the reactive volt-amperes of the load, that is, with an inductive load, a large exciter machine. In this respect, the double-synchronous generator is analogous to the induction generator, and is therefore suited mainly to a load with leading current, as overexcited converters and synchronous motors, in which the reactive component of the load is negative and so compensates for the reactive component of excitation, and thereby reduces the size of the exciter. This means that the double-synchronous alternator has zero armature reaction for non-inductive load, but a demagnetizing armature reaction for inductive, a magnetizing armature reaction for anti-inductive load, and the excitation, by alternating-reactive current, so has to be...

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