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Electricity as Applied to Mining

Electricity as Applied to Mining


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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. 1903 Excerpt: ...enough to cause an explosion in the presence of an explosive mixture of gas and air. Various devices are used to remove the danger (see page 61). On the Continent, three-phase alternating current is often preferred to the continuous current in coal-mines, on account of the danger supposed to lie in the commutator. Alternating Current.--The ordinary alternating current, which is single-phase, is not so suitable for general application to motors as two-phase or three-phase, owing to the difficulty of starting a single-phase motor under load. The two-phase current is considered good for motors, and is adopted at some important central stations, where both lighting and power are THREE-PHASE SYSTEM 141 required. For the purposes of lighting, the current may be taken from the conductors attached to one phase, and then when it is desired to drive a motor the current can be taken from the conductors attached to the two phases (see page 98). The convenience of this system has caused the electrical engineers of the Leeds Corporation, and also of the Sheffield Corporation, to adopt the two-phase system. The three-phase system has, however, the greatest number of advocates. It is considered that the torque is more uniform. In comparing three-phase with two-phase or single-phase, it is generally considered that the weight of copper in the cables in three-phase is only about three-fourths of that in cither of the other two alternating-current systems, and that this advantage applies to most mining installations. It is sometimes claimed for the three-phase system that less copper is required in the conductors than in the continuous-current system. If equal virtual voltages are taken and a power factor of 85 per cent. for the three-phase, then there is a saving by three-ph...


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Product Details
  • ISBN-13: 9781236167828
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 86
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1236167821
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 168 gr

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