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Electrical West Volume 20

Electrical West Volume 20


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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. 1908 Excerpt: ...of greater dielectric strength, greater flexibility and less liability to cracks in the paper or compound. Varnished Cloth Cables. When varnished cloth was first used extensively in the insulating of parts of electric machinery, there was an objection to using it in cables because the insulation resistance was too low to meet the general cable requirements at that time. Since then, engineers have realized that high dielectric strength is more desirable than insulation resistance in megohms, and so the required megohms per mile are not nearly so great now as they were ten years ago. Moreover, the quality of varnished cloth has improved so that now higher insulation resistances are obtainable. Varnished cloth cables have a high dielectric strength, and they seem to also withstand impulsive rises of voltage very much in excess of their normal working pressure. The power factor of the ordinary varnished cloth is higher than that of saturated paper, and hence varnished cloth cables are apt to become somewhat warm when necessary to apply very high voltage under test or working conditions. It is possible, however, to very much reduce this effect by the proper selection of the right materials, and by the method of manufacture. Rubber Insulated Cables. The use of rubber for insulating purposes is so old that it is hardly necessary here to speak of it from a historical standpoint. Cables of almost endless variety are insulated with rubber and covered with lead, which would no doubt be used more extensively for electric light and power cables were it not for the fact that it costs much more than paper, and decentralizes under heat. The best commercial grade of rubber compound used in cables has about forty per cent Para and thirty per cent Para, and is used so frequen...


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Product Details
  • ISBN-13: 9781159657567
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 386
  • Spine Width: 20 mm
  • Width: 189 mm
  • ISBN-10: 1159657564
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 685 gr


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