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Lectures Volume 1; On Illuminating Engineering Delivered at the Johns Hopkins University, October and November, 1910

Lectures Volume 1; On Illuminating Engineering Delivered at the Johns Hopkins University, October and November, 1910


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About the Book

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. 1911 Excerpt: ...from such systems motor generators are often used for changing from 25 to 60 cycles, the latter being the standard frequency for alternating-current lighting. Pig. 5. Pig. 6. Fig. 5.--Three-Phase Three-Wire System. Fig. 6.--Three-Phase Four-Wire System. The 60-cycle generator for city lighting operates usually at some voltage between 2200 and 2600. Since there is always a market for power also, it is commonly of two-or three-phase type. Secondary lighting circuits at 220 to 240 volts are obtained from the polyphase primaries by transformers connected in various arrangements. If the service is for lighting only, single-phase secondaries only are needed, and single transformers for the separate loads are connected to the various phases, and in such manner that the aggregate load is as nearly as possible divided evenly among the several phases. In some instances, however, there is a power load requiring small motors which cannot be operated at the high primary voltage. These moderate-size motors are also most satisfactory in the polyphase type. The secondary distributing system must therefore be polyphase, and this is accomplished by various transformer combinations, resulting in three-, fourand even five-wire secondary systems. Figs. 4, 5, 6 and 7 show several of these combinations. Lighting circuits may be taken from any one of the branches of such a symmetrical system. This results, however, in placing both lamps and motors on the same transformer. Since the alternating-current motor often takes a starting current several times as great as its normal running current, the starting of the motors frequently results in a momentary fluctuation of voltage which is noticeable at the lamp. For the most satisfactory results the lighting and power loads should be on ...


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Product Details
  • ISBN-13: 9781130753097
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 158
  • Spine Width: 9 mm
  • Width: 189 mm
  • ISBN-10: 1130753093
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 295 gr


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Lectures Volume 1; On Illuminating Engineering Delivered at the Johns Hopkins University, October and November, 1910
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