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. 1912 Excerpt: ...low-tension windings in delta. What are the currents in these windings when the motor is carrying a 25 per cent overload? It is estimated that at this overload the power-factor is 90 per cent and the efficiency 92 per cent. The magnetizing current of the transformers is negligible. Ans. 26.4 and 153 amp. Prob. 2. Show ...
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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. 1912 Excerpt: ...low-tension windings in delta. What are the currents in these windings when the motor is carrying a 25 per cent overload? It is estimated that at this overload the power-factor is 90 per cent and the efficiency 92 per cent. The magnetizing current of the transformers is negligible. Ans. 26.4 and 153 amp. Prob. 2. Show that, while the instantaneous electrical output of a single-phase alternator varies at double the frequency of the current, the output of a polyphase machine is practically constant as long as the load remains constant. Show that the same is true for motors. Note: For the electrical relations in two-and three-phase systems with unbalanced loads, and also for the theory of the V and T connections, see the author's Experimental Electrical Engineering, Vol. 2, Chapter 25. A more exhaustive treatment will also be found in his investigation entitled Ueber mehrphasige Stromsysteme bei ungleichmassiger Belastung (published by Enke, 1900). See also the chapters on polyphase systems in Dr. Steinmetz's Alternating-current Phenomena. CHAPTER XI VOLTAGE REGULATION OF THE TRANSFORMER 38. Imperfections in a Transformer Replaced by Equivalent Resistances and Reactances. The reader is familiar in general with the construction and operation of the constant-potential transformer (Fig. 39). It consists of an iron core upon which two windings are placed as closely as possible to each other. When one winding is connected to a constant-potential alternating-current source of power, an alternating magnetic flux is excited in the iron core and an alternating voltage is induced in the other winding. If this latter winding is connected to an electrical load, an alternating current flows through it, and causes a corresponding flow of current through the.first winding, i...
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New. Sewn binding. Cloth over boards. 234 p. In Stock. 100% Money Back Guarantee. Brand New, Perfect Condition, allow 4-14 business days for standard shipping. To Alaska, Hawaii, U.S. protectorate, P.O. box, and APO/FPO addresses allow 4-28 business days for Standard shipping. No expedited shipping. All orders placed with expedited shipping will be cancelled. Over 3, 000, 000 happy customers.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
