This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...If the angle of lag is 90, they are in quadrature, and if 180, they are in opposition. In Fig. 131 are shown two current waves in quadrature. Fia. 131.-Two-phase Currents. If each of these currents were fed into separate lines, a two-phase system would be obtained; the currents differing in phase by 90 or one quarter ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...If the angle of lag is 90, they are in quadrature, and if 180, they are in opposition. In Fig. 131 are shown two current waves in quadrature. Fia. 131.-Two-phase Currents. If each of these currents were fed into separate lines, a two-phase system would be obtained; the currents differing in phase by 90 or one quarter period. In three-phase systems the currents differ in phase by 120 (one third period). This effect is shown in Fig. 132. Fig. 132.--Three-phase CurIt is an easily demonstrated rents property of these currents that their algebraic sum, at any given instant, is zero, or, in other words, at any given instant, there is one of the three currents which is equal in strength to the sum of the other two currents, and opposite in direction thereto. Consequently, one wire of each of the three circuits may be dispensed with, and the three currents carried on the three remaining wires, one of which, at any given instant, acts as the return for the other two, or two act as the return for the other one. The general plan of the twophase system is shown in Fig. 133, while the two common threephase systems are diagrammatically shown in Figs. 134 and 135, the former being called the Star or Y connection and the latter the Delta (A) connection. j Fig. 133.--Two-phase System. Fig. 134.--Star or Y Connec-Fig. 135.--Delta Connection, Three-phase, tion, Three-phase. 80. Hysteresis When an alternating current flows through the winding of an electromagnet, the magnetism in the core is rapidly and completely reversed, the magnetizing force rising from zero to maximum; falling to zero; then to its maximum value in the negative direction, and back again to zero. Theory indicates that the molecules of the magnetic material in the core are reversed with each reversal of the ...
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