Electricity in Coal Mining
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Electricity in Coal Mining

Electricity in Coal Mining


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About the Book

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ...alternating current is used to some extent for mine haulage and for hoisting work, it is frequently found necessary to install rotary converters or motor generator sets to change the alternating into direct current at the point of power application. The direct current is then employed in suitable motors for hoisting and haulage. The chief point in favor of the directcurrent motor is its large capacity for overload and speedvarying characteristics. Returning to the further consideration of power house design the generator room should be of ample size. The machinery foundations heavy and the building well lighted. The exciter should be of adequate capacity to furnish the alternator with sufficient current even under heavy overload and the alternator should be of sufficient size to carry all the designed load without reaching its maximum. Carrying this line of argument still further, the prime mover should be of ample size to pull both the generator and exciter if these were fully loaded without appreciably slackening speed. It is well known that a plant designed upon a liberal basis is more easily kept in first-class operating condition, is less liable to mishaps or breakage and is more economical in operation than one of barely sufficient size. The makers usually guarantee their machines to carry 25 percent overload but it is not well to depend on this 25 percent in the initial design of the installation. A modern power plant should have all the instruments necessary for determining the amount of power generated and furnished, the efficiency of the machinery and the operating expense per kilowatt or per horse-power hour. A record of all the items going to make up these costs should be kept so that the efficiency of the plant as a whole may...


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Product Details
  • ISBN-13: 9781234387198
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 24
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 1234387190
  • Publisher Date: 22 Jan 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 64 gr


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