By Edward Brackett Raymond
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Extra info for Alternating Current -Engineering Practically Treated
From an examination that the current of Fig. f. F ' L Fig. 14. f. applied to inductance. the resultant current in the curve be a sine curve, condenser will be a sine curve. is a loss in resistance due In condensers there to the flow of current in plates, also a hysteresis loss in the dielectric, 90 its namely, * Current Leading Current =C = ft Capacity Cycles Fig. 15- These losses, insulation space, separating its plates. however, are usually small, or even negligible. The two cases of inductance and capacity are shown by polar diagram in the above figures, 14 and 15, ALTERNATING CURRENT ENGINEERING.
42 around with the opposite magnetizing force until a considerable amount of it has been consumed to agree turning them. Simultaneously with this turning around, we get the loss called hysteretic or "core loss," in mentioned before, due to the rubbing of molecules of iron on one another. This curve is called the " hysteresis loop," and closed by the lines is is E From per cycle. wave it repeated, can be shown that the area in- a measure of the hysteresis loss onward, the upper half of the but in a negative direction.
48 resultant, or the voltage required at the alternator for producing existing conditions. f. at the load. This is caused by the presence of the inductance in the To line. quired, calculate the line, first AN, or the total volts re- separate the voltage of the load into its two components, one, AC, in phase with the current, AD, and the other, AH, out of phase with the current. f. f. which from the triangle ACG : in reactance, = E" gives CG = since the square of the long side of a right-angled sum of squares of other two sides.
Alternating Current -Engineering Practically Treated by Edward Brackett Raymond
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