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. 1913 Excerpt: ...of a transformer, and therefore impairs its regulation. Without entering into a controversy regarding the exact point at which a high reluctance in the magnetic circuit of a transformer causes more disadvantage than is counterbalanced by the decreased iron losses brought about by decreasing the amount of iron, the ...
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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. 1913 Excerpt: ...of a transformer, and therefore impairs its regulation. Without entering into a controversy regarding the exact point at which a high reluctance in the magnetic circuit of a transformer causes more disadvantage than is counterbalanced by the decreased iron losses brought about by decreasing the amount of iron, the examples may serve to show the necessity of carefully designing the magnetic circuit to fit the conditions if they can be predetermined. For test on transformer of this type see Trans. A. I. E. E., Vol. 10, p. 497; Elec. World, Vol. 22, p. 357. The commercial efficiency of a transformer is equal to the watts delivered to the external secondary circuit by the transformer divided by the watts absorbed by the primary coil. It may be written where Px and P2 are the power absorbed and delivered respectively by the primary and secondary coils, and L represents the total losses of power in the transformer. The losses are made up of the PR losses in the primary and secondary coils, eddy currents in the windings caused by leakage flux, and the losses due to hysteresis and eddy currents in the core. The PR loss in the secondary winding is directly proportional to the square of the load (secondary output), assuming the secondary terminal voltage to be constant, while the PR loss in the primary winding is nearly proportional to the square of the load, though it contains a small approximately constant term due to the exciting current. The rated capacities of very large transformers are not uncommonly expressed in kilovolt-amperes instead of kilowatts, since the PR heating effect is dependent upon the current, which depends not only upon the load but also inversely upon the power factor when the voltage is constant; but ordinarily the rating of small transforme...
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Add this copy of Alternating Currents and Alternating Current Machinery, to cart. $55.05, very good condition, Sold by BookDepart rated 4.0 out of 5 stars, ships from Shepherdstown, WV, UNITED STATES, published 1913 by Macmillan.
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UsedVeryGood. Hardcover; new edition, rewritten and enlarged; light fading, light shelf w ar to exterior; former owner's name written inside front cover and on front end page; fading to pages; otherwise in very good condition with clean tex t and tight binding.
Add this copy of Alternating Currents and Alternating Current Machinery, to cart. $69.13, new condition, Sold by Revaluation Books rated 4.0 out of 5 stars, ships from Exeter, DEVON, UNITED KINGDOM, published 2009 by BiblioBazaar.
Add this copy of Alternating Currents and Alternating Current Machinery, to cart. $76.42, new condition, Sold by Revaluation Books rated 4.0 out of 5 stars, ships from Exeter, DEVON, UNITED KINGDOM, published 2009 by BiblioBazaar.
