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. 1918 Excerpt: ...slots or holes in the pole shoe. These windings are known as damping grids or amorlisseurs, and consist of a number of heavy copper rods, one in each hole, riveted at the ends to a common bar so as to form a short-circuited grid, as shown in Fig. 237. Excitation and Exciters.--The ordinary types of alternator require ...
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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. 1918 Excerpt: ...slots or holes in the pole shoe. These windings are known as damping grids or amorlisseurs, and consist of a number of heavy copper rods, one in each hole, riveted at the ends to a common bar so as to form a short-circuited grid, as shown in Fig. 237. Excitation and Exciters.--The ordinary types of alternator require to be excited by means of C.C. from some external source, and for this purpose it is usual to instal special C.C. dynamos called exciters in connection with large alternators. One system frequently adopted consists in having an exciter for every alternator, directly driven from the alternator shaft. An alternative method is to have one exciter of sufficient capacity to deal with the excitation of all the alternators in question, the exciter being steam-driven. In this case the exciter can also be made to supply additional power for the purpose of lighting the generating station and for other auxiliary services. Sometimes also there will be a pair of C.C. bus bars convenient, in which case the necessary exciting current can be obtained from the mains. When each alternator is fitted with its own exciter, the regulation of the exciting current can be effected by means of a resistance in the exciter field, which deals with a comparatively small current, but when a common exciter serves a number of alternators the field regulation must be effected by resistances in the exciter main armature circuit. The field regulating resistances must therefore he capable of carrying larger currents, thus resulting in an increase in size. On the other hand, the efficiency of the single exciter is higher and the initial cost lower than when individual exciters are employed. Compounded Alternators.--When an alternator is made to deliver a current its terminal voltag...
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Add this copy of Alternating Current Electrical Engineering to cart. $30.93, new condition, Sold by Books2anywhere rated 5.0 out of 5 stars, ships from Fairford, GLOUCESTERSHIRE, UNITED KINGDOM, published 2022 by LEGARE STREET PR.
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Add this copy of Alternating Current Electrical Engineering to cart. $40.57, new condition, Sold by Books2anywhere rated 5.0 out of 5 stars, ships from Fairford, GLOUCESTERSHIRE, UNITED KINGDOM, published 2022 by LEGARE STREET PR.
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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.
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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.
Add this copy of Alternating Current Electrical Engineering to cart. $43.00, very good condition, Sold by Chapter 1 Books rated 5.0 out of 5 stars, ships from Johannesburg, SOUTH AFRICA, published 1933 by Macmillan.
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